diff --git a/sys/include/ape/bzlib.h b/sys/include/ape/bzlib.h index 221917d9..5012fa7a 100644 --- a/sys/include/ape/bzlib.h +++ b/sys/include/ape/bzlib.h @@ -1,80 +1,27 @@ -#ifndef __BZLIB -#define __BZLIB -#pragma lib "/$M/lib/ape/libbz2.a" -/* - * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL - * FROM THE BZIP2 DISTRIBUTION. - * - * It has been modified, mainly to break the library - * into smaller pieces. - * - * Russ Cox - * rsc@plan9.bell-labs.com - * July 2000 - */ - /*-------------------------------------------------------------*/ /*--- Public header file for the library. ---*/ /*--- bzlib.h ---*/ /*-------------------------------------------------------------*/ -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ +/* ------------------------------------------------------------------ + This file is part of bzip2/libbzip2, a program and library for + lossless, block-sorting data compression. + + bzip2/libbzip2 version 1.0.8 of 13 July 2019 + Copyright (C) 1996-2019 Julian Seward + + Please read the WARNING, DISCLAIMER and PATENTS sections in the + README file. + + This program is released under the terms of the license contained + in the file LICENSE. + ------------------------------------------------------------------ */ + #ifndef _BZLIB_H #define _BZLIB_H +#pragma lib "/$M/lib/ape/libbz2.a" #ifdef __cplusplus extern "C" { @@ -99,7 +46,7 @@ extern "C" { #define BZ_OUTBUFF_FULL (-8) #define BZ_CONFIG_ERROR (-9) -typedef +typedef struct { char *next_in; unsigned int avail_in; @@ -116,7 +63,7 @@ typedef void *(*bzalloc)(void *,int,int); void (*bzfree)(void *,void *); void *opaque; - } + } bz_stream; @@ -124,8 +71,12 @@ typedef #define BZ_EXPORT #endif +#ifndef BZ_NO_STDIO +/* Need a definitition for FILE */ +#include +#endif + #ifdef _WIN32 -# include # include # ifdef small /* windows.h define small to char */ @@ -147,63 +98,132 @@ typedef /*-- Core (low-level) library functions --*/ -BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( - bz_stream* strm, - int blockSize100k, - int verbosity, - int workFactor +BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( + bz_stream* strm, + int blockSize100k, + int verbosity, + int workFactor ); -BZ_EXTERN int BZ_API(BZ2_bzCompress) ( - bz_stream* strm, - int action +BZ_EXTERN int BZ_API(BZ2_bzCompress) ( + bz_stream* strm, + int action ); -BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( - bz_stream* strm +BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( + bz_stream* strm ); -BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( - bz_stream *strm, - int verbosity, +BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( + bz_stream *strm, + int verbosity, int small ); -BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( - bz_stream* strm +BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( + bz_stream* strm + ); + +BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( + bz_stream *strm + ); + + + +/*-- High(er) level library functions --*/ + +#ifndef BZ_NO_STDIO +#define BZ_MAX_UNUSED 5000 + +typedef void BZFILE; + +BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( + int* bzerror, + FILE* f, + int verbosity, + int small, + void* unused, + int nUnused + ); + +BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( + int* bzerror, + BZFILE* b + ); + +BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( + int* bzerror, + BZFILE* b, + void** unused, + int* nUnused ); -BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( - bz_stream *strm +BZ_EXTERN int BZ_API(BZ2_bzRead) ( + int* bzerror, + BZFILE* b, + void* buf, + int len ); +BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( + int* bzerror, + FILE* f, + int blockSize100k, + int verbosity, + int workFactor + ); + +BZ_EXTERN void BZ_API(BZ2_bzWrite) ( + int* bzerror, + BZFILE* b, + void* buf, + int len + ); + +BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( + int* bzerror, + BZFILE* b, + int abandon, + unsigned int* nbytes_in, + unsigned int* nbytes_out + ); + +BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( + int* bzerror, + BZFILE* b, + int abandon, + unsigned int* nbytes_in_lo32, + unsigned int* nbytes_in_hi32, + unsigned int* nbytes_out_lo32, + unsigned int* nbytes_out_hi32 + ); +#endif /*-- Utility functions --*/ -BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( - char* dest, +BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( + char* dest, unsigned int* destLen, - char* source, + char* source, unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor + int blockSize100k, + int verbosity, + int workFactor ); -BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( - char* dest, +BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( + char* dest, unsigned int* destLen, - char* source, + char* source, unsigned int sourceLen, - int small, - int verbosity + int small, + int verbosity ); /*-- - Code contributed by Yoshioka Tsuneo - (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp), + Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp) to support better zlib compatibility. This code is not _officially_ part of libbzip2 (yet); I haven't tested it, documented it, or considered the @@ -215,108 +235,7 @@ BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) ( void ); -#ifdef __cplusplus -} -#endif - -#endif - -/*-------------------------------------------------------------*/ -/*--- end bzlib.h ---*/ -/*-------------------------------------------------------------*/ - -/* - * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL - * FROM THE BZIP2 DISTRIBUTION. - * - * It has been modified, mainly to break the library - * into smaller pieces. - * - * Russ Cox - * rsc@plan9.bell-labs.com - * July 2000 - */ - -/*-------------------------------------------------------------*/ -/*--- Library top-level functions. ---*/ -/*--- bzlib.c ---*/ -/*-------------------------------------------------------------*/ - -/*-- - This file is a part of bzip2 and/or libbzip2, a program and - library for lossless, block-sorting data compression. - - Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. - - 3. Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. - - 4. The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS - OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE - GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - Julian Seward, Cambridge, UK. - jseward@acm.org - bzip2/libbzip2 version 1.0 of 21 March 2000 - - This program is based on (at least) the work of: - Mike Burrows - David Wheeler - Peter Fenwick - Alistair Moffat - Radford Neal - Ian H. Witten - Robert Sedgewick - Jon L. Bentley - - For more information on these sources, see the manual. ---*/ - -/*-- - CHANGES - ~~~~~~~ - 0.9.0 -- original version. - - 0.9.0a/b -- no changes in this file. - - 0.9.0c - * made zero-length BZ_FLUSH work correctly in bzCompress(). - * fixed bzWrite/bzRead to ignore zero-length requests. - * fixed bzread to correctly handle read requests after EOF. - * wrong parameter order in call to bzDecompressInit in - bzBuffToBuffDecompress. Fixed. ---*/ - -#include - -#define BZ_MAX_UNUSED 5000 - -typedef void BZFILE; - +#ifndef BZ_NO_STDIO BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) ( const char *path, const char *mode @@ -326,17 +245,17 @@ BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) ( int fd, const char *mode ); - + BZ_EXTERN int BZ_API(BZ2_bzread) ( - BZFILE* b, - void* buf, - int len + BZFILE* b, + void* buf, + int len ); BZ_EXTERN int BZ_API(BZ2_bzwrite) ( - BZFILE* b, - void* buf, - int len + BZFILE* b, + void* buf, + int len ); BZ_EXTERN int BZ_API(BZ2_bzflush) ( @@ -348,71 +267,17 @@ BZ_EXTERN void BZ_API(BZ2_bzclose) ( ); BZ_EXTERN const char * BZ_API(BZ2_bzerror) ( - BZFILE *b, + BZFILE *b, int *errnum ); +#endif +#ifdef __cplusplus +} +#endif -/*-- High(er) level library functions --*/ -BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( - int* bzerror, - FILE* f, - int verbosity, - int small, - void* unused, - int nUnused - ); - -BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( - int* bzerror, - BZFILE* b - ); - -BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( - int* bzerror, - BZFILE* b, - void** unused, - int* nUnused - ); - -BZ_EXTERN int BZ_API(BZ2_bzRead) ( - int* bzerror, - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( - int* bzerror, - FILE* f, - int blockSize100k, - int verbosity, - int workFactor - ); - -BZ_EXTERN void BZ_API(BZ2_bzWrite) ( - int* bzerror, - BZFILE* b, - void* buf, - int len - ); - -BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( - int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out - ); - -BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( - int* bzerror, - BZFILE* b, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 - ); +#endif -#endif /* __BZLIB */ +/*-------------------------------------------------------------*/ +/*--- end bzlib.h ---*/ +/*-------------------------------------------------------------*/ diff --git a/sys/src/ape/lib/bz2/mkfile b/sys/src/ape/lib/bz2/mkfile index 328a3af0..06903443 100644 --- a/sys/src/ape/lib/bz2/mkfile +++ b/sys/src/ape/lib/bz2/mkfile @@ -4,31 +4,23 @@ APE=$APEXPROOT/sys/src/ape LIB=$APEXPROOT/$objtype/lib/ape/libbz2.a -OFILES=\ - blocksort.$O\ - bzassert.$O\ - bzcompress.$O\ - bzdecompress.$O\ - bzfeof.$O\ - bzlib.$O\ - bzread.$O\ - bzversion.$O\ - bzwrite.$O\ - bzzlib.$O\ - compress.$O\ - crctable.$O\ - decompress.$O\ - huffman.$O\ - randtable.$O\ +OFILES=blocksort.$O\ + huffman.$O\ + crctable.$O\ + randtable.$O\ + compress.$O\ + decompress.$O\ + bzlib.$O HFILES=\ - /sys/include/ape/bzlib.h\ + $APEXPROOT/sys/include/ape/bzlib.h\ <$APEXPROOT/sys/src/cmd/mksyslib BZSOURCE=../../../external/bzip2 -CFLAGS=-FV -p -I$BZSOURCE/lib -DPLAN9 +CC=pcc +CFLAGS=-c -I$BZSOURCE -D_POSIX_SOURCE -%.$O: $BZSOURCE/lib/%.c - $CC $CFLAGS $BZSOURCE/lib/$stem.c +%.$O: $BZSOURCE/%.c + $CC $CFLAGS $BZSOURCE/$stem.c diff --git a/sys/src/external/bzip2/CHANGES b/sys/src/external/bzip2/CHANGES index ecaf4170..30afead2 100644 --- a/sys/src/external/bzip2/CHANGES +++ b/sys/src/external/bzip2/CHANGES @@ -1,3 +1,16 @@ + ------------------------------------------------------------------ + This file is part of bzip2/libbzip2, a program and library for + lossless, block-sorting data compression. + + bzip2/libbzip2 version 1.0.8 of 13 July 2019 + Copyright (C) 1996-2019 Julian Seward + + Please read the WARNING, DISCLAIMER and PATENTS sections in the + README file. + + This program is released under the terms of the license contained + in the file LICENSE. + ------------------------------------------------------------------ 0.9.0 @@ -134,7 +147,7 @@ Several minor bugfixes and enhancements: * Advance the version number to 1.0, so as to counteract the (false-in-this-case) impression some people have that programs - with version numbers less than 1.0 are in someway, experimental, + with version numbers less than 1.0 are in some way, experimental, pre-release versions. * Create an initial Makefile-libbz2_so to build a shared library. @@ -165,3 +178,179 @@ There are no functionality changes or bug fixes relative to version 1.0.0. This is just a documentation update + a fix for minor Win32 build problems. For almost everyone, upgrading from 1.0.0 to 1.0.1 is utterly pointless. Don't bother. + + +1.0.2 +~~~~~ +A bug fix release, addressing various minor issues which have appeared +in the 18 or so months since 1.0.1 was released. Most of the fixes +are to do with file-handling or documentation bugs. To the best of my +knowledge, there have been no data-loss-causing bugs reported in the +compression/decompression engine of 1.0.0 or 1.0.1. + +Note that this release does not improve the rather crude build system +for Unix platforms. The general plan here is to autoconfiscate/ +libtoolise 1.0.2 soon after release, and release the result as 1.1.0 +or perhaps 1.2.0. That, however, is still just a plan at this point. + +Here are the changes in 1.0.2. Bug-reporters and/or patch-senders in +parentheses. + +* Fix an infinite segfault loop in 1.0.1 when a directory is + encountered in -f (force) mode. + (Trond Eivind Glomsrod, Nicholas Nethercote, Volker Schmidt) + +* Avoid double fclose() of output file on certain I/O error paths. + (Solar Designer) + +* Don't fail with internal error 1007 when fed a long stream (> 48MB) + of byte 251. Also print useful message suggesting that 1007s may be + caused by bad memory. + (noticed by Juan Pedro Vallejo, fixed by me) + +* Fix uninitialised variable silly bug in demo prog dlltest.c. + (Jorj Bauer) + +* Remove 512-MB limitation on recovered file size for bzip2recover + on selected platforms which support 64-bit ints. At the moment + all GCC supported platforms, and Win32. + (me, Alson van der Meulen) + +* Hard-code header byte values, to give correct operation on platforms + using EBCDIC as their native character set (IBM's OS/390). + (Leland Lucius) + +* Copy file access times correctly. + (Marty Leisner) + +* Add distclean and check targets to Makefile. + (Michael Carmack) + +* Parameterise use of ar and ranlib in Makefile. Also add $(LDFLAGS). + (Rich Ireland, Bo Thorsen) + +* Pass -p (create parent dirs as needed) to mkdir during make install. + (Jeremy Fusco) + +* Dereference symlinks when copying file permissions in -f mode. + (Volker Schmidt) + +* Majorly simplify implementation of uInt64_qrm10. + (Bo Lindbergh) + +* Check the input file still exists before deleting the output one, + when aborting in cleanUpAndFail(). + (Joerg Prante, Robert Linden, Matthias Krings) + +Also a bunch of patches courtesy of Philippe Troin, the Debian maintainer +of bzip2: + +* Wrapper scripts (with manpages): bzdiff, bzgrep, bzmore. + +* Spelling changes and minor enhancements in bzip2.1. + +* Avoid race condition between creating the output file and setting its + interim permissions safely, by using fopen_output_safely(). + No changes to bzip2recover since there is no issue with file + permissions there. + +* do not print senseless report with -v when compressing an empty + file. + +* bzcat -f works on non-bzip2 files. + +* do not try to escape shell meta-characters on unix (the shell takes + care of these). + +* added --fast and --best aliases for -1 -9 for gzip compatibility. + + +1.0.3 (15 Feb 05) +~~~~~~~~~~~~~~~~~ +Fixes some minor bugs since the last version, 1.0.2. + +* Further robustification against corrupted compressed data. + There are currently no known bitstreams which can cause the + decompressor to crash, loop or access memory which does not + belong to it. If you are using bzip2 or the library to + decompress bitstreams from untrusted sources, an upgrade + to 1.0.3 is recommended. This fixes CAN-2005-1260. + +* The documentation has been converted to XML, from which html + and pdf can be derived. + +* Various minor bugs in the documentation have been fixed. + +* Fixes for various compilation warnings with newer versions of + gcc, and on 64-bit platforms. + +* The BZ_NO_STDIO cpp symbol was not properly observed in 1.0.2. + This has been fixed. + + +1.0.4 (20 Dec 06) +~~~~~~~~~~~~~~~~~ +Fixes some minor bugs since the last version, 1.0.3. + +* Fix file permissions race problem (CAN-2005-0953). + +* Avoid possible segfault in BZ2_bzclose. From Coverity's NetBSD + scan. + +* 'const'/prototype cleanups in the C code. + +* Change default install location to /usr/local, and handle multiple + 'make install's without error. + +* Sanitise file names more carefully in bzgrep. Fixes CAN-2005-0758 + to the extent that applies to bzgrep. + +* Use 'mktemp' rather than 'tempfile' in bzdiff. + +* Tighten up a couple of assertions in blocksort.c following automated + analysis. + +* Fix minor doc/comment bugs. + + +1.0.5 (10 Dec 07) +~~~~~~~~~~~~~~~~~ +Security fix only. Fixes CERT-FI 20469 as it applies to bzip2. + + +1.0.6 (6 Sept 10) +~~~~~~~~~~~~~~~~~ + +* Security fix for CVE-2010-0405. This was reported by Mikolaj + Izdebski. + +* Make the documentation build on Ubuntu 10.04 + +1.0.7 (27 Jun 19) +~~~~~~~~~~~~~~~~~ + +* Fix undefined behavior in the macros SET_BH, CLEAR_BH, & ISSET_BH + +* bzip2: Fix return value when combining --test,-t and -q. + +* bzip2recover: Fix buffer overflow for large argv[0] + +* bzip2recover: Fix use after free issue with outFile (CVE-2016-3189) + +* Make sure nSelectors is not out of range (CVE-2019-12900) + +1.0.8 (13 Jul 19) +~~~~~~~~~~~~~~~~~ + +* Accept as many selectors as the file format allows. + This relaxes the fix for CVE-2019-12900 from 1.0.7 + so that bzip2 allows decompression of bz2 files that + use (too) many selectors again. + +* Fix handling of large (> 4GB) files on Windows. + +* Cleanup of bzdiff and bzgrep scripts so they don't use + any bash extensions and handle multiple archives correctly. + +* There is now a bz2-files testsuite at + https://sourceware.org/git/bzip2-tests.git diff --git a/sys/src/external/bzip2/LICENSE b/sys/src/external/bzip2/LICENSE index 88fa6d88..81a37eab 100644 --- a/sys/src/external/bzip2/LICENSE +++ b/sys/src/external/bzip2/LICENSE @@ -1,6 +1,9 @@ -This program, "bzip2" and associated library "libbzip2", are -copyright (C) 1996-2000 Julian R Seward. All rights reserved. +-------------------------------------------------------------------------- + +This program, "bzip2", the associated library "libbzip2", and all +documentation, are copyright (C) 1996-2019 Julian R Seward. All +rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions @@ -33,7 +36,7 @@ WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -Julian Seward, Cambridge, UK. -jseward@acm.org -bzip2/libbzip2 version 1.0 of 21 March 2000 +Julian Seward, jseward@acm.org +bzip2/libbzip2 version 1.0.8 of 13 July 2019 +-------------------------------------------------------------------------- diff --git a/sys/src/external/bzip2/Makefile b/sys/src/external/bzip2/Makefile new file mode 100644 index 00000000..b0fef950 --- /dev/null +++ b/sys/src/external/bzip2/Makefile @@ -0,0 +1,223 @@ +# ------------------------------------------------------------------ +# This file is part of bzip2/libbzip2, a program and library for +# lossless, block-sorting data compression. +# +# bzip2/libbzip2 version 1.0.8 of 13 July 2019 +# Copyright (C) 1996-2019 Julian Seward +# +# Please read the WARNING, DISCLAIMER and PATENTS sections in the +# README file. +# +# This program is released under the terms of the license contained +# in the file LICENSE. +# ------------------------------------------------------------------ + +SHELL=/bin/sh + +# To assist in cross-compiling +CC=gcc +AR=ar +RANLIB=ranlib +LDFLAGS= + +BIGFILES=-D_FILE_OFFSET_BITS=64 +CFLAGS=-Wall -Winline -O2 -g $(BIGFILES) + +# Where you want it installed when you do 'make install' +PREFIX=/usr/local + + +OBJS= blocksort.o \ + huffman.o \ + crctable.o \ + randtable.o \ + compress.o \ + decompress.o \ + bzlib.o + +all: libbz2.a bzip2 bzip2recover test + +bzip2: libbz2.a bzip2.o + $(CC) $(CFLAGS) $(LDFLAGS) -o bzip2 bzip2.o -L. -lbz2 + +bzip2recover: bzip2recover.o + $(CC) $(CFLAGS) $(LDFLAGS) -o bzip2recover bzip2recover.o + +libbz2.a: $(OBJS) + rm -f libbz2.a + $(AR) cq libbz2.a $(OBJS) + @if ( test -f $(RANLIB) -o -f /usr/bin/ranlib -o \ + -f /bin/ranlib -o -f /usr/ccs/bin/ranlib ) ; then \ + echo $(RANLIB) libbz2.a ; \ + $(RANLIB) libbz2.a ; \ + fi + +check: test +test: bzip2 + @cat words1 + ./bzip2 -1 < sample1.ref > sample1.rb2 + ./bzip2 -2 < sample2.ref > sample2.rb2 + ./bzip2 -3 < sample3.ref > sample3.rb2 + ./bzip2 -d < sample1.bz2 > sample1.tst + ./bzip2 -d < sample2.bz2 > sample2.tst + ./bzip2 -ds < sample3.bz2 > sample3.tst + cmp sample1.bz2 sample1.rb2 + cmp sample2.bz2 sample2.rb2 + cmp sample3.bz2 sample3.rb2 + cmp sample1.tst sample1.ref + cmp sample2.tst sample2.ref + cmp sample3.tst sample3.ref + @cat words3 + +install: bzip2 bzip2recover + if ( test ! -d $(PREFIX)/bin ) ; then mkdir -p $(PREFIX)/bin ; fi + if ( test ! -d $(PREFIX)/lib ) ; then mkdir -p $(PREFIX)/lib ; fi + if ( test ! -d $(PREFIX)/man ) ; then mkdir -p $(PREFIX)/man ; fi + if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir -p $(PREFIX)/man/man1 ; fi + if ( test ! -d $(PREFIX)/include ) ; then mkdir -p $(PREFIX)/include ; fi + cp -f bzip2 $(PREFIX)/bin/bzip2 + cp -f bzip2 $(PREFIX)/bin/bunzip2 + cp -f bzip2 $(PREFIX)/bin/bzcat + cp -f bzip2recover $(PREFIX)/bin/bzip2recover + chmod a+x $(PREFIX)/bin/bzip2 + chmod a+x $(PREFIX)/bin/bunzip2 + chmod a+x $(PREFIX)/bin/bzcat + chmod a+x $(PREFIX)/bin/bzip2recover + cp -f bzip2.1 $(PREFIX)/man/man1 + chmod a+r $(PREFIX)/man/man1/bzip2.1 + cp -f bzlib.h $(PREFIX)/include + chmod a+r $(PREFIX)/include/bzlib.h + cp -f libbz2.a $(PREFIX)/lib + chmod a+r $(PREFIX)/lib/libbz2.a + cp -f bzgrep $(PREFIX)/bin/bzgrep + ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzegrep + ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzfgrep + chmod a+x $(PREFIX)/bin/bzgrep + cp -f bzmore $(PREFIX)/bin/bzmore + ln -s -f $(PREFIX)/bin/bzmore $(PREFIX)/bin/bzless + chmod a+x $(PREFIX)/bin/bzmore + cp -f bzdiff $(PREFIX)/bin/bzdiff + ln -s -f $(PREFIX)/bin/bzdiff $(PREFIX)/bin/bzcmp + chmod a+x $(PREFIX)/bin/bzdiff + cp -f bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1 + chmod a+r $(PREFIX)/man/man1/bzgrep.1 + chmod a+r $(PREFIX)/man/man1/bzmore.1 + chmod a+r $(PREFIX)/man/man1/bzdiff.1 + echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzegrep.1 + echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzfgrep.1 + echo ".so man1/bzmore.1" > $(PREFIX)/man/man1/bzless.1 + echo ".so man1/bzdiff.1" > $(PREFIX)/man/man1/bzcmp.1 + +clean: + rm -f *.o libbz2.a bzip2 bzip2recover \ + sample1.rb2 sample2.rb2 sample3.rb2 \ + sample1.tst sample2.tst sample3.tst + +blocksort.o: blocksort.c + @cat words0 + $(CC) $(CFLAGS) -c blocksort.c +huffman.o: huffman.c + $(CC) $(CFLAGS) -c huffman.c +crctable.o: crctable.c + $(CC) $(CFLAGS) -c crctable.c +randtable.o: randtable.c + $(CC) $(CFLAGS) -c randtable.c +compress.o: compress.c + $(CC) $(CFLAGS) -c compress.c +decompress.o: decompress.c + $(CC) $(CFLAGS) -c decompress.c +bzlib.o: bzlib.c + $(CC) $(CFLAGS) -c bzlib.c +bzip2.o: bzip2.c + $(CC) $(CFLAGS) -c bzip2.c +bzip2recover.o: bzip2recover.c + $(CC) $(CFLAGS) -c bzip2recover.c + + +distclean: clean + rm -f manual.ps manual.html manual.pdf bzip2.txt bzip2.1.preformatted + +DISTNAME=bzip2-1.0.8 +dist: check manual + rm -f $(DISTNAME) + ln -s -f . $(DISTNAME) + tar cvf $(DISTNAME).tar \ + $(DISTNAME)/blocksort.c \ + $(DISTNAME)/huffman.c \ + $(DISTNAME)/crctable.c \ + $(DISTNAME)/randtable.c \ + $(DISTNAME)/compress.c \ + $(DISTNAME)/decompress.c \ + $(DISTNAME)/bzlib.c \ + $(DISTNAME)/bzip2.c \ + $(DISTNAME)/bzip2recover.c \ + $(DISTNAME)/bzlib.h \ + $(DISTNAME)/bzlib_private.h \ + $(DISTNAME)/Makefile \ + $(DISTNAME)/LICENSE \ + $(DISTNAME)/bzip2.1 \ + $(DISTNAME)/bzip2.1.preformatted \ + $(DISTNAME)/bzip2.txt \ + $(DISTNAME)/words0 \ + $(DISTNAME)/words1 \ + $(DISTNAME)/words2 \ + $(DISTNAME)/words3 \ + $(DISTNAME)/sample1.ref \ + $(DISTNAME)/sample2.ref \ + $(DISTNAME)/sample3.ref \ + $(DISTNAME)/sample1.bz2 \ + $(DISTNAME)/sample2.bz2 \ + $(DISTNAME)/sample3.bz2 \ + $(DISTNAME)/dlltest.c \ + $(DISTNAME)/manual.html \ + $(DISTNAME)/manual.pdf \ + $(DISTNAME)/manual.ps \ + $(DISTNAME)/README \ + $(DISTNAME)/README.COMPILATION.PROBLEMS \ + $(DISTNAME)/README.XML.STUFF \ + $(DISTNAME)/CHANGES \ + $(DISTNAME)/libbz2.def \ + $(DISTNAME)/libbz2.dsp \ + $(DISTNAME)/dlltest.dsp \ + $(DISTNAME)/makefile.msc \ + $(DISTNAME)/unzcrash.c \ + $(DISTNAME)/spewG.c \ + $(DISTNAME)/mk251.c \ + $(DISTNAME)/bzdiff \ + $(DISTNAME)/bzdiff.1 \ + $(DISTNAME)/bzmore \ + $(DISTNAME)/bzmore.1 \ + $(DISTNAME)/bzgrep \ + $(DISTNAME)/bzgrep.1 \ + $(DISTNAME)/Makefile-libbz2_so \ + $(DISTNAME)/bz-common.xsl \ + $(DISTNAME)/bz-fo.xsl \ + $(DISTNAME)/bz-html.xsl \ + $(DISTNAME)/bzip.css \ + $(DISTNAME)/entities.xml \ + $(DISTNAME)/manual.xml \ + $(DISTNAME)/format.pl \ + $(DISTNAME)/xmlproc.sh + gzip -v $(DISTNAME).tar + +# For rebuilding the manual from sources on my SuSE 9.1 box + +MANUAL_SRCS= bz-common.xsl bz-fo.xsl bz-html.xsl bzip.css \ + entities.xml manual.xml + +bzip2.txt: bzip2.1 + MANWIDTH=67 man --ascii ./$^ > $@ + +bzip2.1.preformatted: bzip2.1 + MAN_KEEP_FORMATTING=1 MANWIDTH=67 man -E UTF-8 ./$^ > $@ + +manual: manual.html manual.ps manual.pdf bzip2.txt bzip2.1.preformatted + +manual.ps: $(MANUAL_SRCS) + ./xmlproc.sh -ps manual.xml + +manual.pdf: $(MANUAL_SRCS) + ./xmlproc.sh -pdf manual.xml + +manual.html: $(MANUAL_SRCS) + ./xmlproc.sh -html manual.xml diff --git a/sys/src/external/bzip2/Makefile-libbz2_so b/sys/src/external/bzip2/Makefile-libbz2_so new file mode 100644 index 00000000..fb0f2306 --- /dev/null +++ b/sys/src/external/bzip2/Makefile-libbz2_so @@ -0,0 +1,59 @@ + +# This Makefile builds a shared version of the library, +# libbz2.so.1.0.8, with soname libbz2.so.1.0, +# at least on x86-Linux (RedHat 7.2), +# with gcc-2.96 20000731 (Red Hat Linux 7.1 2.96-98). +# Please see the README file for some important info +# about building the library like this. + +# ------------------------------------------------------------------ +# This file is part of bzip2/libbzip2, a program and library for +# lossless, block-sorting data compression. +# +# bzip2/libbzip2 version 1.0.8 of 13 July 2019 +# Copyright (C) 1996-2019 Julian Seward +# +# Please read the WARNING, DISCLAIMER and PATENTS sections in the +# README file. +# +# This program is released under the terms of the license contained +# in the file LICENSE. +# ------------------------------------------------------------------ + + +SHELL=/bin/sh +CC=gcc +BIGFILES=-D_FILE_OFFSET_BITS=64 +CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES) + +OBJS= blocksort.o \ + huffman.o \ + crctable.o \ + randtable.o \ + compress.o \ + decompress.o \ + bzlib.o + +all: $(OBJS) + $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.8 $(OBJS) + $(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.8 + rm -f libbz2.so.1.0 + ln -s libbz2.so.1.0.8 libbz2.so.1.0 + +clean: + rm -f $(OBJS) bzip2.o libbz2.so.1.0.8 libbz2.so.1.0 bzip2-shared + +blocksort.o: blocksort.c + $(CC) $(CFLAGS) -c blocksort.c +huffman.o: huffman.c + $(CC) $(CFLAGS) -c huffman.c +crctable.o: crctable.c + $(CC) $(CFLAGS) -c crctable.c +randtable.o: randtable.c + $(CC) $(CFLAGS) -c randtable.c +compress.o: compress.c + $(CC) $(CFLAGS) -c compress.c +decompress.o: decompress.c + $(CC) $(CFLAGS) -c decompress.c +bzlib.o: bzlib.c + $(CC) $(CFLAGS) -c bzlib.c diff --git a/sys/src/external/bzip2/PROVENANCE b/sys/src/external/bzip2/PROVENANCE deleted file mode 100644 index b372c25f..00000000 --- a/sys/src/external/bzip2/PROVENANCE +++ /dev/null @@ -1 +0,0 @@ -http://sourceware.cygnus.com/bzip2/index.html diff --git a/sys/src/external/bzip2/README b/sys/src/external/bzip2/README index 22945a25..b9c6099f 100644 --- a/sys/src/external/bzip2/README +++ b/sys/src/external/bzip2/README @@ -1,66 +1,90 @@ -This is the README for bzip2, a block-sorting file compressor, version -1.0. This version is fully compatible with the previous public -releases, bzip2-0.1pl2, bzip2-0.9.0 and bzip2-0.9.5. +This is the README for bzip2/libzip2. +This version is fully compatible with the previous public releases. -bzip2-1.0 is distributed under a BSD-style license. For details, -see the file LICENSE. +------------------------------------------------------------------ +This file is part of bzip2/libbzip2, a program and library for +lossless, block-sorting data compression. -Complete documentation is available in Postscript form (manual.ps) or -html (manual_toc.html). A plain-text version of the manual page is -available as bzip2.txt. A statement about Y2K issues is now included -in the file Y2K_INFO. +bzip2/libbzip2 version 1.0.8 of 13 July 2019 +Copyright (C) 1996-2019 Julian Seward + +Please read the WARNING, DISCLAIMER and PATENTS sections in this file. + +This program is released under the terms of the license contained +in the file LICENSE. +------------------------------------------------------------------ + +Complete documentation is available in Postscript form (manual.ps), +PDF (manual.pdf) or html (manual.html). A plain-text version of the +manual page is available as bzip2.txt. HOW TO BUILD -- UNIX -Type `make'. This builds the library libbz2.a and then the -programs bzip2 and bzip2recover. Six self-tests are run. -If the self-tests complete ok, carry on to installation: +Type 'make'. This builds the library libbz2.a and then the programs +bzip2 and bzip2recover. Six self-tests are run. If the self-tests +complete ok, carry on to installation: + +To install in /usr/local/bin, /usr/local/lib, /usr/local/man and +/usr/local/include, type -To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type make install -To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type + +To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type + make install PREFIX=/xxx/yyy + If you are (justifiably) paranoid and want to see what 'make install' is going to do, you can first do + make -n install or make -n install PREFIX=/xxx/yyy respectively. -The -n instructs make to show the commands it would execute, but -not actually execute them. + +The -n instructs make to show the commands it would execute, but not +actually execute them. HOW TO BUILD -- UNIX, shared library libbz2.so. Do 'make -f Makefile-libbz2_so'. This Makefile seems to work for -Linux-ELF (RedHat 5.2 on an x86 box), with gcc. I make no claims +Linux-ELF (RedHat 7.2 on an x86 box), with gcc. I make no claims that it works for any other platform, though I suspect it probably will work for most platforms employing both ELF and gcc. -bzip2-shared, a client of the shared library, is also build, but -not self-tested. So I suggest you also build using the normal -Makefile, since that conducts a self-test. +bzip2-shared, a client of the shared library, is also built, but not +self-tested. So I suggest you also build using the normal Makefile, +since that conducts a self-test. A second reason to prefer the +version statically linked to the library is that, on x86 platforms, +building shared objects makes a valuable register (%ebx) unavailable +to gcc, resulting in a slowdown of 10%-20%, at least for bzip2. -Important note for people upgrading .so's from 0.9.0/0.9.5 to -version 1.0. All the functions in the library have been renamed, -from (eg) bzCompress to BZ2_bzCompress, to avoid namespace pollution. +Important note for people upgrading .so's from 0.9.0/0.9.5 to version +1.0.X. All the functions in the library have been renamed, from (eg) +bzCompress to BZ2_bzCompress, to avoid namespace pollution. Unfortunately this means that the libbz2.so created by -Makefile-libbz2_so will not work with any program which used an -older version of the library. Sorry. I do encourage library -clients to make the effort to upgrade to use version 1.0, since -it is both faster and more robust than previous versions. +Makefile-libbz2_so will not work with any program which used an older +version of the library. I do encourage library clients to make the +effort to upgrade to use version 1.0, since it is both faster and more +robust than previous versions. HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc. It's difficult for me to support compilation on all these platforms. My approach is to collect binaries for these platforms, and put them -on the master web page (http://sourceware.cygnus.com/bzip2). Look -there. However (FWIW), bzip2-1.0 is very standard ANSI C and should -compile unmodified with MS Visual C. For Win32, there is one -important caveat: in bzip2.c, you must set BZ_UNIX to 0 and -BZ_LCCWIN32 to 1 before building. If you have difficulties building, -you might want to read README.COMPILATION.PROBLEMS. +on the master web site (https://sourceware.org/bzip2/). Look there. However +(FWIW), bzip2-1.0.X is very standard ANSI C and should compile +unmodified with MS Visual C. If you have difficulties building, you +might want to read README.COMPILATION.PROBLEMS. + +At least using MS Visual C++ 6, you can build from the unmodified +sources by issuing, in a command shell: + + nmake -f makefile.msc + +(you may need to first run the MSVC-provided script VCVARS32.BAT + so as to set up paths to the MSVC tools correctly). VALIDATION @@ -71,8 +95,7 @@ importance. To validate bzip2, I used a modified version of Mark Nelson's churn program. Churn is an automated test driver which recursively traverses a directory structure, using bzip2 to compress and then decompress each file it encounters, and checking that the -decompressed data is the same as the original. There are more details -in Section 4 of the user guide. +decompressed data is the same as the original. @@ -80,18 +103,19 @@ Please read and be aware of the following: WARNING: - This program (attempts to) compress data by performing several - non-trivial transformations on it. Unless you are 100% familiar - with *all* the algorithms contained herein, and with the - consequences of modifying them, you should NOT meddle with the - compression or decompression machinery. Incorrect changes can and - very likely *will* lead to disastrous loss of data. + This program and library (attempts to) compress data by + performing several non-trivial transformations on it. + Unless you are 100% familiar with *all* the algorithms + contained herein, and with the consequences of modifying them, + you should NOT meddle with the compression or decompression + machinery. Incorrect changes can and very likely *will* + lead to disastrous loss of data. DISCLAIMER: I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE - USE OF THIS PROGRAM, HOWSOEVER CAUSED. + USE OF THIS PROGRAM/LIBRARY, HOWSOEVER CAUSED. Every compression of a file implies an assumption that the compressed file can be decompressed to reproduce the original. @@ -104,19 +128,18 @@ DISCLAIMER: PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER SMALL, THAT THE DATA WILL NOT BE RECOVERABLE. - That is not to say this program is inherently unreliable. Indeed, - I very much hope the opposite is true. bzip2 has been carefully - constructed and extensively tested. + That is not to say this program is inherently unreliable. + Indeed, I very much hope the opposite is true. bzip2/libbzip2 + has been carefully constructed and extensively tested. PATENTS: - To the best of my knowledge, bzip2 does not use any patented - algorithms. However, I do not have the resources available to - carry out a full patent search. Therefore I cannot give any + To the best of my knowledge, bzip2/libbzip2 does not use any + patented algorithms. However, I do not have the resources + to carry out a patent search. Therefore I cannot give any guarantee of the above statement. -End of legalities. WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ? @@ -138,29 +161,36 @@ WHAT'S NEW IN 0.9.5 ? * Many small improvements in file and flag handling. * A Y2K statement. -WHAT'S NEW IN 1.0 +WHAT'S NEW IN 1.0.x ? See the CHANGES file. -I hope you find bzip2 useful. Feel free to contact me at - jseward@acm.org +I hope you find bzip2 useful. Feel free to contact the developers at + bzip2-devel@sourceware.org if you have any suggestions or queries. Many people mailed me with comments, suggestions and patches after the releases of bzip-0.15, -bzip-0.21, bzip2-0.1pl2 and bzip2-0.9.0, and the changes in bzip2 are -largely a result of this feedback. I thank you for your comments. +bzip-0.21, and bzip2 versions 0.1pl2, 0.9.0, 0.9.5, 1.0.0, 1.0.1, +1.0.2 and 1.0.3, and the changes in bzip2 are largely a result of this +feedback. I thank you for your comments. -At least for the time being, bzip2's "home" is (or can be reached via) -http://www.muraroa.demon.co.uk. +bzip2's "home" is https://sourceware.org/bzip2/ Julian Seward jseward@acm.org - -Cambridge, UK -18 July 1996 (version 0.15) -25 August 1996 (version 0.21) - 7 August 1997 (bzip2, version 0.1) -29 August 1997 (bzip2, version 0.1pl2) -23 August 1998 (bzip2, version 0.9.0) - 8 June 1999 (bzip2, version 0.9.5) - 4 Sept 1999 (bzip2, version 0.9.5d) - 5 May 2000 (bzip2, version 1.0pre8) +Cambridge, UK. + +18 July 1996 (version 0.15) +25 August 1996 (version 0.21) + 7 August 1997 (bzip2, version 0.1) +29 August 1997 (bzip2, version 0.1pl2) +23 August 1998 (bzip2, version 0.9.0) + 8 June 1999 (bzip2, version 0.9.5) + 4 Sept 1999 (bzip2, version 0.9.5d) + 5 May 2000 (bzip2, version 1.0pre8) +30 December 2001 (bzip2, version 1.0.2pre1) +15 February 2005 (bzip2, version 1.0.3) +20 December 2006 (bzip2, version 1.0.4) +10 December 2007 (bzip2, version 1.0.5) + 6 Sept 2010 (bzip2, version 1.0.6) +27 June 2019 (bzip2, version 1.0.7) +13 July 2019 (bzip2, version 1.0.8) diff --git a/sys/src/external/bzip2/README.COMPILATION.PROBLEMS b/sys/src/external/bzip2/README.COMPILATION.PROBLEMS new file mode 100644 index 00000000..fa317a50 --- /dev/null +++ b/sys/src/external/bzip2/README.COMPILATION.PROBLEMS @@ -0,0 +1,58 @@ +------------------------------------------------------------------ +This file is part of bzip2/libbzip2, a program and library for +lossless, block-sorting data compression. + +bzip2/libbzip2 version 1.0.8 of 13 July 2019 +Copyright (C) 1996-2019 Julian Seward + +Please read the WARNING, DISCLAIMER and PATENTS sections in the +README file. + +This program is released under the terms of the license contained +in the file LICENSE. +------------------------------------------------------------------ + +bzip2 should compile without problems on the vast majority of +platforms. Using the supplied Makefile, I've built and tested it +myself for x86-linux and amd64-linux. With makefile.msc, Visual C++ +6.0 and nmake, you can build a native Win32 version too. Large file +support seems to work correctly on at least on amd64-linux. + +When I say "large file" I mean a file of size 2,147,483,648 (2^31) +bytes or above. Many older OSs can't handle files above this size, +but many newer ones can. Large files are pretty huge -- most files +you'll encounter are not Large Files. + +Early versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide variety +of platforms without difficulty, and I hope this version will continue +in that tradition. However, in order to support large files, I've had +to include the define -D_FILE_OFFSET_BITS=64 in the Makefile. This +can cause problems. + +The technique of adding -D_FILE_OFFSET_BITS=64 to get large file +support is, as far as I know, the Recommended Way to get correct large +file support. For more details, see the Large File Support +Specification, published by the Large File Summit, at + + http://ftp.sas.com/standards/large.file + +As a general comment, if you get compilation errors which you think +are related to large file support, try removing the above define from +the Makefile, ie, delete the line + + BIGFILES=-D_FILE_OFFSET_BITS=64 + +from the Makefile, and do 'make clean ; make'. This will give you a +version of bzip2 without large file support, which, for most +applications, is probably not a problem. + +Alternatively, try some of the platform-specific hints listed below. + +You can use the spewG.c program to generate huge files to test bzip2's +large file support, if you are feeling paranoid. Be aware though that +any compilation problems which affect bzip2 will also affect spewG.c, +alas. + +AIX: I have reports that for large file support, you need to specify +-D_LARGE_FILES rather than -D_FILE_OFFSET_BITS=64. I have not tested +this myself. diff --git a/sys/src/external/bzip2/README.Plan9 b/sys/src/external/bzip2/README.Plan9 deleted file mode 100644 index 9aeef889..00000000 --- a/sys/src/external/bzip2/README.Plan9 +++ /dev/null @@ -1,11 +0,0 @@ -This is Julian Seward's bzip2 but has -been hacked up a fair amount to allow finer -granularity of function selection. - -In case that wasn't clear, -THESE ARE NOT THE ORIGINAL SOURCES. -THEY HAVE BEEN MODIFIED. - -Russ Cox -July 2000 -rsc@plan9.bell-labs.com diff --git a/sys/src/external/bzip2/README.XML.STUFF b/sys/src/external/bzip2/README.XML.STUFF new file mode 100644 index 00000000..1503476e --- /dev/null +++ b/sys/src/external/bzip2/README.XML.STUFF @@ -0,0 +1,45 @@ + ---------------------------------------------------------------- + This file is part of bzip2/libbzip2, a program and library for + lossless, block-sorting data compression. + + bzip2/libbzip2 version 1.0.8 of 13 July 2019 + Copyright (C) 1996-2019 Julian Seward + + Please read the WARNING, DISCLAIMER and PATENTS sections in the + README file. + + This program is released under the terms of the license contained + in the file LICENSE. + ---------------------------------------------------------------- + +The script xmlproc.sh takes an xml file as input, +and processes it to create .pdf, .html or .ps output. +It uses format.pl, a perl script to format 
 blocks nicely,
+ and add CDATA tags so writers do not have to use eg. < 
+
+The file "entities.xml" must be edited to reflect current
+version, year, etc.
+
+
+Usage:
+
+  ./xmlproc.sh -v manual.xml
+  Validates an xml file to ensure no dtd-compliance errors
+
+  ./xmlproc.sh -html manual.xml
+  Output: manual.html
+
+  ./xmlproc.sh -pdf manual.xml
+  Output: manual.pdf
+
+  ./xmlproc.sh -ps manual.xml
+  Output: manual.ps
+
+
+Notum bene: 
+- pdfxmltex barfs if given a filename with an underscore in it
+
+- xmltex won't work yet - there's a bug in passivetex
+    which we are all waiting for Sebastian to fix.
+  So we are going the xml -> pdf -> ps route for the time being,
+    using pdfxmltex.
diff --git a/sys/src/external/bzip2/lib/blocksort.c b/sys/src/external/bzip2/blocksort.c
similarity index 91%
rename from sys/src/external/bzip2/lib/blocksort.c
rename to sys/src/external/bzip2/blocksort.c
index f43d569e..92d81fe2 100644
--- a/sys/src/external/bzip2/lib/blocksort.c
+++ b/sys/src/external/bzip2/blocksort.c
@@ -4,69 +4,21 @@
 /*---                                           blocksort.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
-
-  To get some idea how the block sorting algorithms in this file 
-  work, read my paper 
-     On the Performance of BWT Sorting Algorithms
-  in Proceedings of the IEEE Data Compression Conference 2000,
-  Snowbird, Utah, USA, 27-30 March 2000.  The main sort in this
-  file implements the algorithm called  cache  in the paper.
---*/
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
 
-#include "os.h"
-#include "bzlib.h"
 #include "bzlib_private.h"
 
 /*---------------------------------------------*/
@@ -156,7 +108,7 @@ void fallbackQSort3 ( UInt32* fmap,
 
    while (sp > 0) {
 
-      AssertH ( sp < FALLBACK_QSORT_STACK_SIZE, 1004 );
+      AssertH ( sp < FALLBACK_QSORT_STACK_SIZE - 1, 1004 );
 
       fpop ( lo, hi );
       if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) {
@@ -250,9 +202,9 @@ void fallbackQSort3 ( UInt32* fmap,
       bhtab [ 0 .. 2+(nblock/32) ] destroyed
 */
 
-#define       SET_BH(zz)  bhtab[(zz) >> 5] |= (1 << ((zz) & 31))
-#define     CLEAR_BH(zz)  bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31))
-#define     ISSET_BH(zz)  (bhtab[(zz) >> 5] & (1 << ((zz) & 31)))
+#define       SET_BH(zz)  bhtab[(zz) >> 5] |= ((UInt32)1 << ((zz) & 31))
+#define     CLEAR_BH(zz)  bhtab[(zz) >> 5] &= ~((UInt32)1 << ((zz) & 31))
+#define     ISSET_BH(zz)  (bhtab[(zz) >> 5] & ((UInt32)1 << ((zz) & 31)))
 #define      WORD_BH(zz)  bhtab[(zz) >> 5]
 #define UNALIGNED_BH(zz)  ((zz) & 0x01f)
 
@@ -691,7 +643,7 @@ void mainQSort3 ( UInt32* ptr,
 
    while (sp > 0) {
 
-      AssertH ( sp < MAIN_QSORT_STACK_SIZE, 1001 );
+      AssertH ( sp < MAIN_QSORT_STACK_SIZE - 2, 1001 );
 
       mpop ( lo, hi, d );
       if (hi - lo < MAIN_QSORT_SMALL_THRESH || 
@@ -982,7 +934,14 @@ void mainSort ( UInt32* ptr,
          }
       }
 
-      AssertH ( copyStart[ss]-1 == copyEnd[ss], 1007 );
+      AssertH ( (copyStart[ss]-1 == copyEnd[ss])
+                || 
+                /* Extremely rare case missing in bzip2-1.0.0 and 1.0.1.
+                   Necessity for this case is demonstrated by compressing 
+                   a sequence of approximately 48.5 million of character 
+                   251; 1.0.0/1.0.1 will then die here. */
+                (copyStart[ss] == 0 && copyEnd[ss] == nblock-1),
+                1007 )
 
       for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK;
 
diff --git a/sys/src/external/bzip2/bunzip2.c b/sys/src/external/bzip2/bunzip2.c
deleted file mode 100644
index d4ff7b81..00000000
--- a/sys/src/external/bzip2/bunzip2.c
+++ /dev/null
@@ -1,188 +0,0 @@
-#include 
-#include 
-#include 
-#include "bzlib.h"
-
-static	Biobuf	bin;
-static	int	debug;
-static	int	verbose;
-static	char	*delfile;
-static	char	*infile;
-static	int	bunzipf(char *file, int stdout);
-static	int	bunzip(int ofd, char *ofile, Biobuf *bin);
-
-void
-usage(void)
-{
-	fprint(2, "usage: bunzip2 [-cvD] [file ...]\n");
-	exits("usage");
-}
-
-void
-main(int argc, char **argv)
-{
-	int i, ok, stdout;
-
-	stdout = 0;
-	ARGBEGIN{
-	case 'D':
-		debug++;
-		break;
-	case 'c':
-		stdout++;
-		break;
-	case 'v':
-		verbose++;
-		break;
-	default:
-		usage();
-	}ARGEND
-
-	if(argc == 0){
-		Binit(&bin, 0, OREAD);
-		infile = "";
-		ok = bunzip(1, "", &bin);
-	}else{
-		ok = 1;
-		for(i = 0; i < argc; i++)
-			ok &= bunzipf(argv[i], stdout);
-	}
-
-	exits(ok ? nil: "errors");
-}
-
-static int
-bunzipf(char *file, int stdout)
-{
-	char ofile[64], *s;
-	int ofd, ifd, ok;
-
-	infile = file;
-	ifd = open(file, OREAD);
-	if(ifd < 0){
-		fprint(2, "bunzip2: can't open %s: %r\n", file);
-		return 0;
-	}
-
-	Binit(&bin, ifd, OREAD);
-	if(Bgetc(&bin) != 'B' || Bgetc(&bin) != 'Z' || Bgetc(&bin) != 'h'){
-		fprint(2, "bunzip2: %s is not a bzip2 file\n", file);
-		Bterm(&bin);
-		close(ifd);
-		return 0;
-	}
-	Bungetc(&bin);
-	Bungetc(&bin);
-	Bungetc(&bin);
-
-	if(stdout){
-		ofd = 1;
-		strcpy(ofile, "");
-	}else{
-		s = strrchr(file, '/');
-		if(s != nil)
-			s++;
-		else
-			s = file;
-		strecpy(ofile, ofile+sizeof ofile, s);
-		s = strrchr(ofile, '.');
-		if(s != nil && s != ofile && strcmp(s, ".bz2") == 0)
-			*s = '\0';
-		else if(s != nil && (strcmp(s, ".tbz") == 0 || strcmp(s, ".tbz2") == 0))
-			strcpy(s, ".tar");
-		else if(strcmp(file, ofile) == 0){
-			fprint(2, "bunzip2: can't overwrite %s\n", file);
-			Bterm(&bin);
-			close(ifd);
-			return 0;
-		}
-
-		ofd = create(ofile, OWRITE, 0666);
-		if(ofd < 0){
-			fprint(2, "bunzip2: can't create %s: %r\n", ofile);
-			Bterm(&bin);
-			close(ifd);
-			return 0;
-		}
-		delfile = ofile;
-	}
-
-	ok = bunzip(ofd, ofile, &bin);
-	Bterm(&bin);
-	close(ifd);
-	if(!ok){
-		fprint(2, "bunzip2: can't write %s: %r\n", ofile);
-		if(delfile)
-			remove(delfile);
-	}
-	delfile = nil;
-	if(!stdout && ofd >= 0)
-		close(ofd);
-	return ok;
-}
-
-static int
-bunzip(int ofd, char *ofile, Biobuf *bin)
-{
-	int e, n, done, onemore;
-	char buf[IOUNIT];
-	char obuf[IOUNIT];
-	Biobuf bout;
-	bz_stream strm;
-
-	USED(ofile);
-
-	memset(&strm, 0, sizeof strm);
-	BZ2_bzDecompressInit(&strm, verbose, 0);
-
-	strm.next_in = buf;
-	strm.avail_in = 0;
-	strm.next_out = obuf;
-	strm.avail_out = sizeof obuf;
-
-	done = 0;
-	Binit(&bout, ofd, OWRITE);
-
-	/*
-	 * onemore is a crummy hack to go 'round the loop
-	 * once after we finish, to flush the output buffer.
-	 */
-	onemore = 1;
-	SET(e);
-	do {
-		if(!done && strm.avail_in < sizeof buf) {
-			if(strm.avail_in)
-				memmove(buf, strm.next_in, strm.avail_in);
-			
-			n = Bread(bin, buf+strm.avail_in, sizeof(buf)-strm.avail_in);
-			if(n <= 0)
-				done = 1;
-			else
-				strm.avail_in += n;
-			strm.next_in = buf;
-		}
-		if(strm.avail_out < sizeof obuf) {
-			Bwrite(&bout, obuf, sizeof(obuf)-strm.avail_out);
-			strm.next_out = obuf;
-			strm.avail_out = sizeof obuf;
-		}
-		if(onemore == 0)
-			break;
-		if(strm.avail_in == 0 && strm.avail_out == sizeof obuf)
-			break;
-	} while((e=BZ2_bzDecompress(&strm)) == BZ_OK || onemore--);
-
-	if(e != BZ_STREAM_END) {
-		fprint(2, "bunzip2: decompress failed\n");
-		return 0;
-	}
-
-	if(BZ2_bzDecompressEnd(&strm) != BZ_OK) {
-		fprint(2, "bunzip2: decompress end failed (can't happen)\n");
-		return 0;
-	}
-
-	Bterm(&bout);
-
-	return 1;
-}
diff --git a/sys/src/external/bzip2/bz-common.xsl b/sys/src/external/bzip2/bz-common.xsl
new file mode 100644
index 00000000..66fcd6fe
--- /dev/null
+++ b/sys/src/external/bzip2/bz-common.xsl
@@ -0,0 +1,39 @@
+ 
+
+
+
+ 
+
+
+
+ 
+ 
+   
+    
+      
+     
+  
+
+
+
+
+set       toc,title
+book      toc,title,figure,table,example,equation
+chapter   toc,title
+section   toc
+sect1     toc
+sect2     toc
+sect3     toc
+sect4     nop
+sect5     nop
+qandaset  toc
+qandadiv  nop
+appendix  toc,title
+article/appendix  nop
+article   toc,title
+preface   toc,title
+reference toc,title
+
+
+
diff --git a/sys/src/external/bzip2/bz-fo.xsl b/sys/src/external/bzip2/bz-fo.xsl
new file mode 100644
index 00000000..ba3e3012
--- /dev/null
+++ b/sys/src/external/bzip2/bz-fo.xsl
@@ -0,0 +1,276 @@
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+      
+     
+   
+
+
+
+
+ 
+
+
+
+
+
+
+  
+
+
+
+
+  blue
+
+
+
+
+  
+    
+  
+
+
+
+  
+    
+  
+
+
+
+
+  
+  
+  
+    
+      
+    
+  
+  
+    
+      
+        
+          •
+          •
+          •
+        
+      
+    
+    
+          
+    
+  
+  
+    
+      
+        
+      
+    
+    
+      
+        
+      
+    
+  
+
+
+
+
+  
+  
+  
+    
+      
+        
+      
+    
+    
+          
+    
+  
+  
+    
+      
+        
+      
+    
+    
+      
+        
+      
+    
+  
+
+
+
+
+
+  
+    
+  
+    
+  
+  
+    
+      
+    
+  
+
+
+
+
+
+  
+  
+  
+  
+    
+      0pt
+    
+  
+  
+    
+      
+      
+      
+        
+          
+            baseline
+             
+               
+            
+          
+          
+            baseline
+            
+              
+                
+                
+                
+                
+              
+            
+          
+        
+      
+    
+  
+  
+  
+    
+      
+    
+    
+      
+    
+    
+      
+    
+  
+
+
+
+
+
+  
+  
+  
+  
+    
+      0pt
+    
+  
+  
+    
+      
+        
+        
+        
+      
+      
+      
+      
+        
+          
+            baseline
+            
+               
+            
+          
+          
+            baseline
+            
+              
+                
+                
+                
+                
+              
+            
+          
+        
+      
+    
+  
+  
+  
+    
+      
+    
+    
+      
+    
+    
+      
+    
+  
+
+
+
+
+
+
+  always
+  
+    
+  
+  
+    
+    pt
+  
+  
+    
+    pt
+  
+  false
+
+
+
+
diff --git a/sys/src/external/bzip2/bz-html.xsl b/sys/src/external/bzip2/bz-html.xsl
new file mode 100644
index 00000000..b6000d58
--- /dev/null
+++ b/sys/src/external/bzip2/bz-html.xsl
@@ -0,0 +1,23 @@
+ 
+ ]>
+
+
+
+
+
+
+
+
+
+
+
+  
+link rel="stylesheet" type="text/css" href="bzip.css" />
+  
+  
+
+
+
diff --git a/sys/src/external/bzip2/bzdiff b/sys/src/external/bzip2/bzdiff
new file mode 100755
index 00000000..bd96c27c
--- /dev/null
+++ b/sys/src/external/bzip2/bzdiff
@@ -0,0 +1,76 @@
+#!/bin/sh
+# sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh
+
+# Bzcmp/diff wrapped for bzip2, 
+# adapted from zdiff by Philippe Troin  for Debian GNU/Linux.
+
+# Bzcmp and bzdiff are used to invoke the cmp or the  diff  pro-
+# gram  on compressed files.  All options specified are passed
+# directly to cmp or diff.  If only 1 file is specified,  then
+# the  files  compared  are file1 and an uncompressed file1.gz.
+# If two files are specified, then they are  uncompressed  (if
+# necessary) and fed to cmp or diff.  The exit status from cmp
+# or diff is preserved.
+
+PATH="/usr/bin:/bin:$PATH"; export PATH
+prog=`echo $0 | sed 's|.*/||'`
+case "$prog" in
+  *cmp) comp=${CMP-cmp}   ;;
+  *)    comp=${DIFF-diff} ;;
+esac
+
+OPTIONS=
+FILES=
+for ARG
+do
+    case "$ARG" in
+    -*)	OPTIONS="$OPTIONS $ARG";;
+     *)	if test -f "$ARG"; then
+            FILES="$FILES $ARG"
+        else
+            echo "${prog}: $ARG not found or not a regular file"
+	    exit 1
+        fi ;;
+    esac
+done
+if test -z "$FILES"; then
+	echo "Usage: $prog [${comp}_options] file [file]"
+	exit 1
+fi
+set $FILES
+if test $# -eq 1; then
+	FILE=`echo "$1" | sed 's/.bz2$//'`
+	bzip2 -cd "$FILE.bz2" | $comp $OPTIONS - "$FILE"
+	STAT="$?"
+
+elif test $# -eq 2; then
+	case "$1" in
+        *.bz2)
+                case "$2" in
+	        *.bz2)
+			F=`echo "$2" | sed 's|.*/||;s|.bz2$||'`
+			tmp=`mktemp "${TMPDIR:-/tmp}"/bzdiff.XXXXXXXXXX` || {
+			      echo 'cannot create a temporary file' >&2
+			      exit 1
+			}
+                        bzip2 -cdfq "$2" > "$tmp"
+                        bzip2 -cdfq "$1" | $comp $OPTIONS - "$tmp"
+                        STAT="$?"
+			/bin/rm -f "$tmp";;
+
+                *)      bzip2 -cdfq "$1" | $comp $OPTIONS - "$2"
+                        STAT="$?";;
+                esac;;
+        *)      case "$2" in
+	        *.bz2)
+                        bzip2 -cdfq "$2" | $comp $OPTIONS "$1" -
+                        STAT="$?";;
+                *)      $comp $OPTIONS "$1" "$2"
+                        STAT="$?";;
+                esac;;
+	esac
+else
+	echo "Usage: $prog [${comp}_options] file [file]"
+	exit 1
+fi
+exit "$STAT"
diff --git a/sys/src/external/bzip2/bzdiff.1 b/sys/src/external/bzip2/bzdiff.1
new file mode 100644
index 00000000..f02fa243
--- /dev/null
+++ b/sys/src/external/bzip2/bzdiff.1
@@ -0,0 +1,52 @@
+\"Shamelessly copied from zmore.1 by Philippe Troin 
+\"for Debian GNU/Linux
+.TH BZDIFF 1
+.SH NAME
+bzcmp, bzdiff \- compare bzip2 compressed files
+.SH SYNOPSIS
+.B bzcmp
+[ cmp_options ] file1
+[ file2 ]
+.br
+.B bzdiff
+[ diff_options ] file1
+[ file2 ]
+.SH DESCRIPTION
+.I  Bzcmp
+and 
+.I bzdiff
+are used to invoke the
+.I cmp
+or the
+.I diff
+program on bzip2 compressed files.  All options specified are passed
+directly to
+.I cmp
+or
+.IR diff "."
+If only 1 file is specified, then the files compared are
+.I file1
+and an uncompressed
+.IR file1 ".bz2."
+If two files are specified, then they are uncompressed if necessary and fed to
+.I cmp
+or
+.IR diff "."
+The exit status from 
+.I cmp
+or
+.I diff
+is preserved.
+.SH "SEE ALSO"
+.BR cmp (1),
+.BR diff (1),
+.BR bzmore (1),
+.BR bzless (1),
+.BR bzgrep (1),
+.BR bzip2 (1)
+.SH BUGS
+Messages from the
+.I cmp
+or
+.I diff
+programs refer to temporary filenames instead of those specified.
diff --git a/sys/src/external/bzip2/bzgrep b/sys/src/external/bzip2/bzgrep
new file mode 100755
index 00000000..0314ca60
--- /dev/null
+++ b/sys/src/external/bzip2/bzgrep
@@ -0,0 +1,85 @@
+#!/bin/sh
+
+# Bzgrep wrapped for bzip2, 
+# adapted from zgrep by Philippe Troin  for Debian GNU/Linux.
+## zgrep notice:
+## zgrep -- a wrapper around a grep program that decompresses files as needed
+## Adapted from a version sent by Charles Levert 
+
+PATH="/usr/bin:$PATH"; export PATH
+
+prog=`echo $0 | sed 's|.*/||'`
+case "$prog" in
+	*egrep)	grep=${EGREP-egrep}	;;
+	*fgrep)	grep=${FGREP-fgrep}	;;
+	*)	grep=${GREP-grep}	;;
+esac
+pat=""
+while test $# -ne 0; do
+  case "$1" in
+  -e | -f) opt="$opt $1"; shift; pat="$1"
+           if test "$grep" = grep; then  # grep is buggy with -e on SVR4
+             grep=egrep
+           fi;;
+  -A | -B) opt="$opt $1 $2"; shift;;
+  -*)	   opt="$opt $1";;
+   *)      if test -z "$pat"; then
+	     pat="$1"
+	   else
+	     break;
+           fi;;
+  esac
+  shift
+done
+
+if test -z "$pat"; then
+  echo "grep through bzip2 files"
+  echo "usage: $prog [grep_options] pattern [files]"
+  exit 1
+fi
+
+list=0
+silent=0
+op=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
+case "$op" in
+  *l*) list=1
+esac
+case "$op" in
+  *h*) silent=1
+esac
+
+if test $# -eq 0; then
+  bzip2 -cdfq | $grep $opt "$pat"
+  exit $?
+fi
+
+res=0
+for i do
+  if test -f "$i"; then :; else if test -f "$i.bz2"; then i="$i.bz2"; fi; fi
+  if test $list -eq 1; then
+    bzip2 -cdfq "$i" | $grep $opt "$pat" 2>&1 > /dev/null && echo $i
+    r=$?
+  elif test $# -eq 1 -o $silent -eq 1; then
+    bzip2 -cdfq "$i" | $grep $opt "$pat"
+    r=$?
+  else
+    j=$(echo "$i" | sed 's/\\/&&/g;s/|/\\&/g;s/&/\\&/g')
+    j=`printf "%s" "$j" | tr '\n' ' '`
+    # A trick adapted from
+    # https://groups.google.com/forum/#!original/comp.unix.shell/x1345iu10eg/Nn1n-1r1uU0J
+    # that has the same effect as the following bash code:
+    # bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"
+    # r=${PIPESTATUS[1]}
+    exec 3>&1
+    eval `
+      exec 4>&1 >&3 3>&-
+      {
+        bzip2 -cdfq "$i" 4>&-
+      } | {
+        $grep $opt "$pat" 4>&-; echo "r=$?;" >&4
+      } | sed "s|^|${j}:|"
+    `
+  fi
+  test "$r" -ne 0 && res="$r"
+done
+exit $res
diff --git a/sys/src/external/bzip2/bzgrep.1 b/sys/src/external/bzip2/bzgrep.1
new file mode 100644
index 00000000..54bb31fc
--- /dev/null
+++ b/sys/src/external/bzip2/bzgrep.1
@@ -0,0 +1,62 @@
+\"Shamelessly copied from zmore.1 by Philippe Troin 
+\"for Debian GNU/Linux
+.TH BZGREP 1
+.SH NAME
+bzgrep, bzfgrep, bzegrep \- search possibly bzip2 compressed files for a regular expression
+.SH SYNOPSIS
+.B bzgrep
+[ grep_options ]
+.BI  [\ -e\ ] " pattern"
+.IR filename ".\|.\|."
+.br
+.B bzegrep
+[ egrep_options ]
+.BI  [\ -e\ ] " pattern"
+.IR filename ".\|.\|."
+.br
+.B bzfgrep
+[ fgrep_options ]
+.BI  [\ -e\ ] " pattern"
+.IR filename ".\|.\|."
+.SH DESCRIPTION
+.IR  Bzgrep
+is used to invoke the
+.I grep
+on bzip2-compressed files. All options specified are passed directly to
+.I grep.
+If no file is specified, then the standard input is decompressed
+if necessary and fed to grep.
+Otherwise the given files are uncompressed if necessary and fed to
+.I grep.
+.PP
+If
+.I bzgrep
+is invoked as
+.I bzegrep
+or
+.I bzfgrep
+then
+.I egrep
+or
+.I fgrep
+is used instead of
+.I grep.
+If the GREP environment variable is set,
+.I bzgrep
+uses it as the
+.I grep
+program to be invoked. For example:
+
+    for sh:  GREP=fgrep  bzgrep string files
+    for csh: (setenv GREP fgrep; bzgrep string files)
+.SH AUTHOR
+Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe
+Troin  for Debian GNU/Linux.
+.SH "SEE ALSO"
+.BR grep (1),
+.BR egrep (1),
+.BR fgrep (1),
+.BR bzdiff (1),
+.BR bzmore (1),
+.BR bzless (1),
+.BR bzip2 (1)
diff --git a/sys/src/external/bzip2/bzip.css b/sys/src/external/bzip2/bzip.css
new file mode 100644
index 00000000..21131183
--- /dev/null
+++ b/sys/src/external/bzip2/bzip.css
@@ -0,0 +1,74 @@
+/* Colours:
+#74240f  dark brown      h1, h2, h3, h4
+#336699  medium blue     links
+#339999  turquoise       link hover colour
+#202020  almost black    general text
+#761596  purple          md5sum text
+#626262  dark gray       pre border
+#eeeeee  very light gray pre background
+#f2f2f9  very light blue nav table background
+#3366cc  medium blue     nav table border
+*/
+
+a, a:link, a:visited, a:active { color: #336699; }
+a:hover { color: #339999; }
+
+body { font: 80%/126% sans-serif; }
+h1, h2, h3, h4 { color: #74240f; }
+
+dt { color: #336699; font-weight: bold }
+dd { 
+ margin-left: 1.5em; 
+ padding-bottom: 0.8em;
+}
+
+/* -- ruler -- */
+div.hr_blue { 
+  height:  3px; 
+  background:#ffffff url("../images/hr_blue.png") repeat-x; }
+div.hr_blue hr { display:none; }
+
+/* release styles */
+#release p { margin-top: 0.4em; }
+#release .md5sum { color: #761596; }
+
+
+/* ------ styles for docs|manuals|howto ------ */
+/* -- lists -- */
+ul  { 
+ margin:     0px 4px 16px 16px;
+ padding:    0px;
+ list-style: url("../images/li-blue.png"); 
+}
+ul li { 
+ margin-bottom: 10px;
+}
+ul ul	{ 
+ list-style-type:  none; 
+ list-style-image: none; 
+ margin-left:      0px; 
+}
+
+/* header / footer nav tables */
+table.nav {
+ border:     solid 1px #3366cc;
+ background: #f2f2f9;
+ background-color: #f2f2f9;
+ margin-bottom: 0.5em;
+}
+/* don't have underlined links in chunked nav menus */
+table.nav a { text-decoration: none; }
+table.nav a:hover { text-decoration: underline; }
+table.nav td { font-size: 85%; }
+
+code, tt, pre { font-size: 120%; }
+code, tt { color: #761596; }
+
+div.literallayout, pre.programlisting, pre.screen {
+ color:      #000000;
+ padding:    0.5em;
+ background: #eeeeee;
+ border:     1px solid #626262;
+ background-color: #eeeeee;
+ margin: 4px 0px 4px 0px; 
+}
diff --git a/sys/src/external/bzip2/bzip2.1 b/sys/src/external/bzip2/bzip2.1
new file mode 100644
index 00000000..11d97bba
--- /dev/null
+++ b/sys/src/external/bzip2/bzip2.1
@@ -0,0 +1,464 @@
+.TH bzip2 1
+.SH NAME
+bzip2, bunzip2 \- a block-sorting file compressor, v1.0.8
+.br
+bzcat \- decompresses files to stdout
+.br
+bzip2recover \- recovers data from damaged bzip2 files
+
+.SH SYNOPSIS
+.ll +8
+.B bzip2
+.RB [ " \-cdfkqstvzVL123456789 " ]
+[
+.I "filenames \&..."
+]
+.br
+.B bzip2
+.RB [ " \-h|\-\-help " ]
+.ll -8
+.br
+.B bunzip2
+.RB [ " \-fkvsVL " ]
+[
+.I "filenames \&..."
+]
+.br
+.B bunzip2
+.RB [ " \-h|\-\-help " ]
+.br
+.B bzcat
+.RB [ " \-s " ]
+[
+.I "filenames \&..."
+]
+.br
+.B bzcat
+.RB [ " \-h|\-\-help " ]
+.br
+.B bzip2recover
+.I "filename"
+
+.SH DESCRIPTION
+.I bzip2
+compresses files using the Burrows-Wheeler block sorting
+text compression algorithm, and Huffman coding.  Compression is
+generally considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of the PPM
+family of statistical compressors.
+
+The command-line options are deliberately very similar to
+those of
+.I GNU gzip,
+but they are not identical.
+
+.I bzip2
+expects a list of file names to accompany the
+command-line flags.  Each file is replaced by a compressed version of
+itself, with the name "original_name.bz2".
+Each compressed file
+has the same modification date, permissions, and, when possible,
+ownership as the corresponding original, so that these properties can
+be correctly restored at decompression time.  File name handling is
+naive in the sense that there is no mechanism for preserving original
+file names, permissions, ownerships or dates in filesystems which lack
+these concepts, or have serious file name length restrictions, such as
+MS-DOS.
+
+.I bzip2
+and
+.I bunzip2
+will by default not overwrite existing
+files.  If you want this to happen, specify the \-f flag.
+
+If no file names are specified,
+.I bzip2
+compresses from standard
+input to standard output.  In this case,
+.I bzip2
+will decline to
+write compressed output to a terminal, as this would be entirely
+incomprehensible and therefore pointless.
+
+.I bunzip2
+(or
+.I bzip2 \-d)
+decompresses all
+specified files.  Files which were not created by
+.I bzip2
+will be detected and ignored, and a warning issued.
+.I bzip2
+attempts to guess the filename for the decompressed file
+from that of the compressed file as follows:
+
+       filename.bz2    becomes   filename
+       filename.bz     becomes   filename
+       filename.tbz2   becomes   filename.tar
+       filename.tbz    becomes   filename.tar
+       anyothername    becomes   anyothername.out
+
+If the file does not end in one of the recognised endings,
+.I .bz2,
+.I .bz,
+.I .tbz2
+or
+.I .tbz,
+.I bzip2
+complains that it cannot
+guess the name of the original file, and uses the original name
+with
+.I .out
+appended.
+
+As with compression, supplying no
+filenames causes decompression from
+standard input to standard output.
+
+.I bunzip2
+will correctly decompress a file which is the
+concatenation of two or more compressed files.  The result is the
+concatenation of the corresponding uncompressed files.  Integrity
+testing (\-t)
+of concatenated
+compressed files is also supported.
+
+You can also compress or decompress files to the standard output by
+giving the \-c flag.  Multiple files may be compressed and
+decompressed like this.  The resulting outputs are fed sequentially to
+stdout.  Compression of multiple files
+in this manner generates a stream
+containing multiple compressed file representations.  Such a stream
+can be decompressed correctly only by
+.I bzip2
+version 0.9.0 or
+later.  Earlier versions of
+.I bzip2
+will stop after decompressing
+the first file in the stream.
+
+.I bzcat
+(or
+.I bzip2 -dc)
+decompresses all specified files to
+the standard output.
+
+.I bzip2
+will read arguments from the environment variables
+.I BZIP2
+and
+.I BZIP,
+in that order, and will process them
+before any arguments read from the command line.  This gives a
+convenient way to supply default arguments.
+
+Compression is always performed, even if the compressed
+file is slightly
+larger than the original.  Files of less than about one hundred bytes
+tend to get larger, since the compression mechanism has a constant
+overhead in the region of 50 bytes.  Random data (including the output
+of most file compressors) is coded at about 8.05 bits per byte, giving
+an expansion of around 0.5%.
+
+As a self-check for your protection,
+.I bzip2
+uses 32-bit CRCs to
+make sure that the decompressed version of a file is identical to the
+original.  This guards against corruption of the compressed data, and
+against undetected bugs in
+.I bzip2
+(hopefully very unlikely).  The
+chances of data corruption going undetected is microscopic, about one
+chance in four billion for each file processed.  Be aware, though, that
+the check occurs upon decompression, so it can only tell you that
+something is wrong.  It can't help you
+recover the original uncompressed
+data.  You can use
+.I bzip2recover
+to try to recover data from
+damaged files.
+
+Return values: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
+compressed file, 3 for an internal consistency error (eg, bug) which
+caused
+.I bzip2
+to panic.
+
+.SH OPTIONS
+.TP
+.B \-c --stdout
+Compress or decompress to standard output.
+.TP
+.B \-d --decompress
+Force decompression.
+.I bzip2,
+.I bunzip2
+and
+.I bzcat
+are
+really the same program, and the decision about what actions to take is
+done on the basis of which name is used.  This flag overrides that
+mechanism, and forces
+.I bzip2
+to decompress.
+.TP
+.B \-z --compress
+The complement to \-d: forces compression, regardless of the
+invocation name.
+.TP
+.B \-t --test
+Check integrity of the specified file(s), but don't decompress them.
+This really performs a trial decompression and throws away the result.
+.TP
+.B \-f --force
+Force overwrite of output files.  Normally,
+.I bzip2
+will not overwrite
+existing output files.  Also forces
+.I bzip2
+to break hard links
+to files, which it otherwise wouldn't do.
+
+bzip2 normally declines to decompress files which don't have the
+correct magic header bytes.  If forced (-f), however, it will pass
+such files through unmodified.  This is how GNU gzip behaves.
+.TP
+.B \-k --keep
+Keep (don't delete) input files during compression
+or decompression.
+.TP
+.B \-s --small
+Reduce memory usage, for compression, decompression and testing.  Files
+are decompressed and tested using a modified algorithm which only
+requires 2.5 bytes per block byte.  This means any file can be
+decompressed in 2300\ k of memory, albeit at about half the normal speed.
+
+During compression, \-s selects a block size of 200\ k, which limits
+memory use to around the same figure, at the expense of your compression
+ratio.  In short, if your machine is low on memory (8 megabytes or
+less), use \-s for everything.  See MEMORY MANAGEMENT below.
+.TP
+.B \-q --quiet
+Suppress non-essential warning messages.  Messages pertaining to
+I/O errors and other critical events will not be suppressed.
+.TP
+.B \-v --verbose
+Verbose mode -- show the compression ratio for each file processed.
+Further \-v's increase the verbosity level, spewing out lots of
+information which is primarily of interest for diagnostic purposes.
+.TP
+.B \-h \-\-help
+Print a help message and exit.
+.TP
+.B \-L --license -V --version
+Display the software version, license terms and conditions.
+.TP
+.B \-1 (or \-\-fast) to \-9 (or \-\-best)
+Set the block size to 100 k, 200 k ...  900 k when compressing.  Has no
+effect when decompressing.  See MEMORY MANAGEMENT below.
+The \-\-fast and \-\-best aliases are primarily for GNU gzip
+compatibility.  In particular, \-\-fast doesn't make things
+significantly faster.
+And \-\-best merely selects the default behaviour.
+.TP
+.B \--
+Treats all subsequent arguments as file names, even if they start
+with a dash.  This is so you can handle files with names beginning
+with a dash, for example: bzip2 \-- \-myfilename.
+.TP
+.B \--repetitive-fast --repetitive-best
+These flags are redundant in versions 0.9.5 and above.  They provided
+some coarse control over the behaviour of the sorting algorithm in
+earlier versions, which was sometimes useful.  0.9.5 and above have an
+improved algorithm which renders these flags irrelevant.
+
+.SH MEMORY MANAGEMENT
+.I bzip2
+compresses large files in blocks.  The block size affects
+both the compression ratio achieved, and the amount of memory needed for
+compression and decompression.  The flags \-1 through \-9
+specify the block size to be 100,000 bytes through 900,000 bytes (the
+default) respectively.  At decompression time, the block size used for
+compression is read from the header of the compressed file, and
+.I bunzip2
+then allocates itself just enough memory to decompress
+the file.  Since block sizes are stored in compressed files, it follows
+that the flags \-1 to \-9 are irrelevant to and so ignored
+during decompression.
+
+Compression and decompression requirements,
+in bytes, can be estimated as:
+
+       Compression:   400\ k + ( 8 x block size )
+
+       Decompression: 100\ k + ( 4 x block size ), or
+                      100\ k + ( 2.5 x block size )
+
+Larger block sizes give rapidly diminishing marginal returns.  Most of
+the compression comes from the first two or three hundred k of block
+size, a fact worth bearing in mind when using
+.I bzip2
+on small machines.
+It is also important to appreciate that the decompression memory
+requirement is set at compression time by the choice of block size.
+
+For files compressed with the default 900\ k block size,
+.I bunzip2
+will require about 3700 kbytes to decompress.  To support decompression
+of any file on a 4 megabyte machine,
+.I bunzip2
+has an option to
+decompress using approximately half this amount of memory, about 2300
+kbytes.  Decompression speed is also halved, so you should use this
+option only where necessary.  The relevant flag is -s.
+
+In general, try and use the largest block size memory constraints allow,
+since that maximises the compression achieved.  Compression and
+decompression speed are virtually unaffected by block size.
+
+Another significant point applies to files which fit in a single block
+-- that means most files you'd encounter using a large block size.  The
+amount of real memory touched is proportional to the size of the file,
+since the file is smaller than a block.  For example, compressing a file
+20,000 bytes long with the flag -9 will cause the compressor to
+allocate around 7600\ k of memory, but only touch 400\ k + 20000 * 8 = 560
+kbytes of it.  Similarly, the decompressor will allocate 3700\ k but only
+touch 100\ k + 20000 * 4 = 180 kbytes.
+
+Here is a table which summarises the maximum memory usage for different
+block sizes.  Also recorded is the total compressed size for 14 files of
+the Calgary Text Compression Corpus totalling 3,141,622 bytes.  This
+column gives some feel for how compression varies with block size.
+These figures tend to understate the advantage of larger block sizes for
+larger files, since the Corpus is dominated by smaller files.
+
+           Compress   Decompress   Decompress   Corpus
+    Flag     usage      usage       -s usage     Size
+
+     -1      1200k       500k         350k      914704
+     -2      2000k       900k         600k      877703
+     -3      2800k      1300k         850k      860338
+     -4      3600k      1700k        1100k      846899
+     -5      4400k      2100k        1350k      845160
+     -6      5200k      2500k        1600k      838626
+     -7      6100k      2900k        1850k      834096
+     -8      6800k      3300k        2100k      828642
+     -9      7600k      3700k        2350k      828642
+
+.SH RECOVERING DATA FROM DAMAGED FILES
+.I bzip2
+compresses files in blocks, usually 900\ kbytes long.  Each
+block is handled independently.  If a media or transmission error causes
+a multi-block .bz2
+file to become damaged, it may be possible to
+recover data from the undamaged blocks in the file.
+
+The compressed representation of each block is delimited by a 48-bit
+pattern, which makes it possible to find the block boundaries with
+reasonable certainty.  Each block also carries its own 32-bit CRC, so
+damaged blocks can be distinguished from undamaged ones.
+
+.I bzip2recover
+is a simple program whose purpose is to search for
+blocks in .bz2 files, and write each block out into its own .bz2
+file.  You can then use
+.I bzip2
+\-t
+to test the
+integrity of the resulting files, and decompress those which are
+undamaged.
+
+.I bzip2recover
+takes a single argument, the name of the damaged file,
+and writes a number of files "rec00001file.bz2",
+"rec00002file.bz2", etc., containing the  extracted  blocks.
+The output filenames are designed so that the use of
+wildcards in subsequent processing -- for example,
+"bzip2 -dc rec*file.bz2 > recovered_data" -- processes the files in
+the correct order.
+
+.I bzip2recover
+should be of most use dealing with large .bz2
+files, as these will contain many blocks.  It is clearly
+futile to use it on damaged single-block files, since a
+damaged block cannot be recovered.  If you wish to minimise
+any potential data loss through media or transmission errors,
+you might consider compressing with a smaller
+block size.
+
+.SH PERFORMANCE NOTES
+The sorting phase of compression gathers together similar strings in the
+file.  Because of this, files containing very long runs of repeated
+symbols, like "aabaabaabaab ...\&" (repeated several hundred times) may
+compress more slowly than normal.  Versions 0.9.5 and above fare much
+better than previous versions in this respect.  The ratio between
+worst-case and average-case compression time is in the region of 10:1.
+For previous versions, this figure was more like 100:1.  You can use the
+\-vvvv option to monitor progress in great detail, if you want.
+
+Decompression speed is unaffected by these phenomena.
+
+.I bzip2
+usually allocates several megabytes of memory to operate
+in, and then charges all over it in a fairly random fashion.  This means
+that performance, both for compressing and decompressing, is largely
+determined by the speed at which your machine can service cache misses.
+Because of this, small changes to the code to reduce the miss rate have
+been observed to give disproportionately large performance improvements.
+I imagine
+.I bzip2
+will perform best on machines with very large caches.
+
+.SH CAVEATS
+I/O error messages are not as helpful as they could be.
+.I bzip2
+tries hard to detect I/O errors and exit cleanly, but the details of
+what the problem is sometimes seem rather misleading.
+
+This manual page pertains to version 1.0.8 of
+.I bzip2.
+Compressed data created by this version is entirely forwards and
+backwards compatible with the previous public releases, versions
+0.1pl2, 0.9.0, 0.9.5, 1.0.0, 1.0.1, 1.0.2 and above, but with the following
+exception: 0.9.0 and above can correctly decompress multiple
+concatenated compressed files.  0.1pl2 cannot do this; it will stop
+after decompressing just the first file in the stream.
+
+.I bzip2recover
+versions prior to 1.0.2 used 32-bit integers to represent
+bit positions in compressed files, so they could not handle compressed
+files more than 512 megabytes long.  Versions 1.0.2 and above use
+64-bit ints on some platforms which support them (GNU supported
+targets, and Windows).  To establish whether or not bzip2recover was
+built with such a limitation, run it without arguments.  In any event
+you can build yourself an unlimited version if you can recompile it
+with MaybeUInt64 set to be an unsigned 64-bit integer.
+
+
+
+.SH AUTHOR
+Julian Seward, jseward@acm.org.
+
+https://sourceware.org/bzip2/
+
+The ideas embodied in
+.I bzip2
+are due to (at least) the following
+people: Michael Burrows and David Wheeler (for the block sorting
+transformation), David Wheeler (again, for the Huffman coder), Peter
+Fenwick (for the structured coding model in the original
+.I bzip,
+and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
+(for the arithmetic coder in the original
+.I bzip).
+I am much
+indebted for their help, support and advice.  See the manual in the
+source distribution for pointers to sources of documentation.  Christian
+von Roques encouraged me to look for faster sorting algorithms, so as to
+speed up compression.  Bela Lubkin encouraged me to improve the
+worst-case compression performance.
+Donna Robinson XMLised the documentation.
+The bz* scripts are derived from those of GNU gzip.
+Many people sent patches, helped
+with portability problems, lent machines, gave advice and were generally
+helpful.
diff --git a/sys/src/external/bzip2/bzip2.c b/sys/src/external/bzip2/bzip2.c
index 4c7ed428..9ef75364 100644
--- a/sys/src/external/bzip2/bzip2.c
+++ b/sys/src/external/bzip2/bzip2.c
@@ -1,195 +1,2046 @@
-#include 
-#include 
-#include 
+
+/*-----------------------------------------------------------*/
+/*--- A block-sorting, lossless compressor        bzip2.c ---*/
+/*-----------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+/* Place a 1 beside your platform, and 0 elsewhere.
+   Generic 32-bit Unix.
+   Also works on 64-bit Unix boxes.
+   This is the default.
+*/
+#define BZ_UNIX      1
+
+/*--
+  Win32, as seen by Jacob Navia's excellent
+  port of (Chris Fraser & David Hanson)'s excellent
+  lcc compiler.  Or with MS Visual C.
+  This is selected automatically if compiled by a compiler which
+  defines _WIN32, not including the Cygwin GCC.
+--*/
+#define BZ_LCCWIN32  0
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#undef  BZ_LCCWIN32
+#define BZ_LCCWIN32 1
+#undef  BZ_UNIX
+#define BZ_UNIX 0
+#endif
+
+
+/*---------------------------------------------*/
+/*--
+  Some stuff for all platforms.
+--*/
+
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
 #include "bzlib.h"
 
-static	int	bzipf(char*, int, int);
-static	int	bzip(char*, long, int, Biobuf*);
-
-static	Biobuf	bout;
-static	int	level;
-static	int	debug;
-static	int	verbose;
-
-
-static void
-usage(void)
-{
-	fprint(2, "usage: bzip2 [-vcnD] [-1-9] [file ...]\n");
-	exits("usage");
-}
-
-void
-main(int argc, char **argv)
-{
-	int i, ok, stdout;
-	long mtime;
-
-	level = 6;
-	stdout = 0;
-	mtime = time(nil);
-	ARGBEGIN{
-	case 'D':
-		debug++;
-		break;
-	case 'v':
-		verbose++;
-		break;
-	case 'c':
-		stdout++;
-		break;
-	case 'n':
-		mtime = 0;
-		break;
-	case '1': case '2': case '3': case '4':
-	case '5': case '6': case '7': case '8': case '9':
-		level = ARGC() - '0';
-		break;
-	default:
-		usage();
-		break;
-	}ARGEND
-
-	if(argc == 0){
-		Binit(&bout, 1, OWRITE);
-		ok = bzip(nil, mtime, 0, &bout);
-		Bterm(&bout);
-	}else{
-		ok = 1;
-		for(i = 0; i < argc; i++)
-			ok &= bzipf(argv[i], !mtime, stdout);
-	}
-	exits(ok ? nil: "errors");
-}
-
-static int
-bzipf(char *file, int nomtime, int stdout)
-{
-	Dir *dir;
-	char ofile[128], *f, *s;
-	int ifd, ofd, ok;
-
-	ifd = open(file, OREAD);
-	if(ifd < 0){
-		fprint(2, "bzip2: can't open %s: %r\n", file);
-		return 0;
-	}
-	dir = dirfstat(ifd);
-	if(dir == nil){
-		fprint(2, "bzip2: can't stat %s: %r\n", file);
-		close(ifd);
-		return 0;
-	}
-	if(dir->mode & DMDIR){
-		fprint(2, "bzip2: can't compress a directory\n");
-		close(ifd);
-		free(dir);
-		return 0;
-	}
-
-	if(stdout){
-		ofd = 1;
-		strcpy(ofile, "");
-	}else{
-		f = strrchr(file, '/');
-		if(f != nil)
-			f++;
-		else
-			f = file;
-		s = strrchr(f, '.');
-		if(s != nil && s != ofile && strcmp(s, ".tar") == 0){
-			*s = '\0';
-			snprint(ofile, sizeof(ofile), "%s.tbz", f);
-		}else
-			snprint(ofile, sizeof(ofile), "%s.bz2", f);
-		ofd = create(ofile, OWRITE, 0666);
-		if(ofd < 0){
-			fprint(2, "bzip2: can't open %s: %r\n", ofile);
-			free(dir);
-			close(ifd);
-			return 0;
-		}
-	}
-
-	if(verbose)
-		fprint(2, "compressing %s to %s\n", file, ofile);
-
-	Binit(&bout, ofd, OWRITE);
-	ok = bzip(file, nomtime ? 0 : dir->mtime, ifd, &bout);
-	if(!ok || Bflush(&bout) < 0){
-		fprint(2, "bzip2: error writing %s: %r\n", ofile);
-		if(!stdout)
-			remove(ofile);
-	}
-	Bterm(&bout);
-	free(dir);
-	close(ifd);
-	close(ofd);
-	return ok;
-}
-
-static int
-bzip(char *file, long mtime, int ifd, Biobuf *bout)
-{
-	int e, n, done, onemore;
-	char buf[IOUNIT];
-	char obuf[IOUNIT];
-	Biobuf bin;
-	bz_stream strm;
-
-	USED(file);
-	USED(mtime);
-
-	memset(&strm, 0, sizeof strm);
-	BZ2_bzCompressInit(&strm, level, verbose, 0);
-
-	strm.next_in = buf;
-	strm.avail_in = 0;
-	strm.next_out = obuf;
-	strm.avail_out = sizeof obuf;
-
-	done = 0;
-	Binit(&bin, ifd, OREAD);
-
-	/*
-	 * onemore is a crummy hack to go 'round the loop
-	 * once after we finish, to flush the output buffer.
-	 */
-	onemore = 1;
-	SET(e);
-	do {
-		if(!done && strm.avail_in < sizeof buf) {
-			if(strm.avail_in)
-				memmove(buf, strm.next_in, strm.avail_in);
-			
-			n = Bread(&bin, buf+strm.avail_in, sizeof(buf)-strm.avail_in);
-			if(n <= 0)
-				done = 1;
-			else
-				strm.avail_in += n;
-			strm.next_in = buf;
-		}
-		if(strm.avail_out < sizeof obuf) {
-			Bwrite(bout, obuf, sizeof(obuf)-strm.avail_out);
-			strm.next_out = obuf;
-			strm.avail_out = sizeof obuf;
-		}
-
-		if(onemore == 0)
-			break;
-	} while((e=BZ2_bzCompress(&strm, done ? BZ_FINISH : BZ_RUN)) == BZ_RUN_OK || e == BZ_FINISH_OK || onemore--);
-
-	if(e != BZ_STREAM_END) {
-		fprint(2, "bzip2: compress failed\n");
-		return 0;
-	}
-
-	if(BZ2_bzCompressEnd(&strm) != BZ_OK) {
-		fprint(2, "bzip2: compress end failed (can't happen)\n");
-		return 0;
-	}
-
-	Bterm(&bin);
-
-	return 1;
+#define ERROR_IF_EOF(i)       { if ((i) == EOF)  ioError(); }
+#define ERROR_IF_NOT_ZERO(i)  { if ((i) != 0)    ioError(); }
+#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); }
+
+
+/*---------------------------------------------*/
+/*--
+   Platform-specific stuff.
+--*/
+
+#if BZ_UNIX
+#   include 
+#   include 
+#   include 
+#   include 
+#   include 
+#   include 
+
+#   define PATH_SEP    '/'
+#   define MY_LSTAT    lstat
+#   define MY_STAT     stat
+#   define MY_S_ISREG  S_ISREG
+#   define MY_S_ISDIR  S_ISDIR
+
+#   define APPEND_FILESPEC(root, name) \
+      root=snocString((root), (name))
+
+#   define APPEND_FLAG(root, name) \
+      root=snocString((root), (name))
+
+#   define SET_BINARY_MODE(fd) /**/
+
+#   ifdef __GNUC__
+#      define NORETURN __attribute__ ((noreturn))
+#   else
+#      define NORETURN /**/
+#   endif
+
+#   ifdef __DJGPP__
+#     include 
+#     include 
+#     undef MY_LSTAT
+#     undef MY_STAT
+#     define MY_LSTAT stat
+#     define MY_STAT stat
+#     undef SET_BINARY_MODE
+#     define SET_BINARY_MODE(fd)                        \
+        do {                                            \
+           int retVal = setmode ( fileno ( fd ),        \
+                                  O_BINARY );           \
+           ERROR_IF_MINUS_ONE ( retVal );               \
+        } while ( 0 )
+#   endif
+
+#   ifdef __CYGWIN__
+#     include 
+#     include 
+#     undef SET_BINARY_MODE
+#     define SET_BINARY_MODE(fd)                        \
+        do {                                            \
+           int retVal = setmode ( fileno ( fd ),        \
+                                  O_BINARY );           \
+           ERROR_IF_MINUS_ONE ( retVal );               \
+        } while ( 0 )
+#   endif
+#endif /* BZ_UNIX */
+
+
+
+#if BZ_LCCWIN32
+#   include 
+#   include 
+#   include 
+
+#   define NORETURN       /**/
+#   define PATH_SEP       '\\'
+#   define MY_LSTAT       _stati64
+#   define MY_STAT        _stati64
+#   define MY_S_ISREG(x)  ((x) & _S_IFREG)
+#   define MY_S_ISDIR(x)  ((x) & _S_IFDIR)
+
+#   define APPEND_FLAG(root, name) \
+      root=snocString((root), (name))
+
+#   define APPEND_FILESPEC(root, name)                \
+      root = snocString ((root), (name))
+
+#   define SET_BINARY_MODE(fd)                        \
+      do {                                            \
+         int retVal = setmode ( fileno ( fd ),        \
+                                O_BINARY );           \
+         ERROR_IF_MINUS_ONE ( retVal );               \
+      } while ( 0 )
+
+#   define STDERR_FILENO _fileno(stderr)
+
+#endif /* BZ_LCCWIN32 */
+
+
+/*---------------------------------------------*/
+/*--
+  Some more stuff for all platforms :-)
+--*/
+
+typedef char            Char;
+typedef unsigned char   Bool;
+typedef unsigned char   UChar;
+typedef int             Int32;
+typedef unsigned int    UInt32;
+typedef short           Int16;
+typedef unsigned short  UInt16;
+                                       
+#define True  ((Bool)1)
+#define False ((Bool)0)
+
+/*--
+  IntNative is your platform's `native' int size.
+  Only here to avoid probs with 64-bit platforms.
+--*/
+typedef int IntNative;
+
+
+/*---------------------------------------------------*/
+/*--- Misc (file handling) data decls             ---*/
+/*---------------------------------------------------*/
+
+Int32   verbosity;
+Bool    keepInputFiles, smallMode, deleteOutputOnInterrupt;
+Bool    forceOverwrite, testFailsExist, unzFailsExist, noisy;
+Int32   numFileNames, numFilesProcessed, blockSize100k;
+Int32   exitValue;
+
+/*-- source modes; F==file, I==stdin, O==stdout --*/
+#define SM_I2O           1
+#define SM_F2O           2
+#define SM_F2F           3
+
+/*-- operation modes --*/
+#define OM_Z             1
+#define OM_UNZ           2
+#define OM_TEST          3
+
+Int32   opMode;
+Int32   srcMode;
+
+#define FILE_NAME_LEN 1034
+
+Int32   longestFileName;
+Char    inName [FILE_NAME_LEN];
+Char    outName[FILE_NAME_LEN];
+Char    tmpName[FILE_NAME_LEN];
+Char    *progName;
+Char    progNameReally[FILE_NAME_LEN];
+FILE    *outputHandleJustInCase;
+Int32   workFactor;
+
+static void    panic                 ( const Char* ) NORETURN;
+static void    ioError               ( void )        NORETURN;
+static void    outOfMemory           ( void )        NORETURN;
+static void    configError           ( void )        NORETURN;
+static void    crcError              ( void )        NORETURN;
+static void    cleanUpAndFail        ( Int32 )       NORETURN;
+static void    compressedStreamEOF   ( void )        NORETURN;
+
+static void    copyFileName ( Char*, Char* );
+static void*   myMalloc     ( Int32 );
+static void    applySavedFileAttrToOutputFile ( IntNative fd );
+
+
+
+/*---------------------------------------------------*/
+/*--- An implementation of 64-bit ints.  Sigh.    ---*/
+/*--- Roll on widespread deployment of ANSI C9X ! ---*/
+/*---------------------------------------------------*/
+
+typedef
+   struct { UChar b[8]; } 
+   UInt64;
+
+
+static
+void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 )
+{
+   n->b[7] = (UChar)((hi32 >> 24) & 0xFF);
+   n->b[6] = (UChar)((hi32 >> 16) & 0xFF);
+   n->b[5] = (UChar)((hi32 >> 8)  & 0xFF);
+   n->b[4] = (UChar) (hi32        & 0xFF);
+   n->b[3] = (UChar)((lo32 >> 24) & 0xFF);
+   n->b[2] = (UChar)((lo32 >> 16) & 0xFF);
+   n->b[1] = (UChar)((lo32 >> 8)  & 0xFF);
+   n->b[0] = (UChar) (lo32        & 0xFF);
+}
+
+
+static
+double uInt64_to_double ( UInt64* n )
+{
+   Int32  i;
+   double base = 1.0;
+   double sum  = 0.0;
+   for (i = 0; i < 8; i++) {
+      sum  += base * (double)(n->b[i]);
+      base *= 256.0;
+   }
+   return sum;
+}
+
+
+static
+Bool uInt64_isZero ( UInt64* n )
+{
+   Int32 i;
+   for (i = 0; i < 8; i++)
+      if (n->b[i] != 0) return 0;
+   return 1;
+}
+
+
+/* Divide *n by 10, and return the remainder.  */
+static 
+Int32 uInt64_qrm10 ( UInt64* n )
+{
+   UInt32 rem, tmp;
+   Int32  i;
+   rem = 0;
+   for (i = 7; i >= 0; i--) {
+      tmp = rem * 256 + n->b[i];
+      n->b[i] = tmp / 10;
+      rem = tmp % 10;
+   }
+   return rem;
+}
+
+
+/* ... and the Whole Entire Point of all this UInt64 stuff is
+   so that we can supply the following function.
+*/
+static
+void uInt64_toAscii ( char* outbuf, UInt64* n )
+{
+   Int32  i, q;
+   UChar  buf[32];
+   Int32  nBuf   = 0;
+   UInt64 n_copy = *n;
+   do {
+      q = uInt64_qrm10 ( &n_copy );
+      buf[nBuf] = q + '0';
+      nBuf++;
+   } while (!uInt64_isZero(&n_copy));
+   outbuf[nBuf] = 0;
+   for (i = 0; i < nBuf; i++) 
+      outbuf[i] = buf[nBuf-i-1];
+}
+
+
+/*---------------------------------------------------*/
+/*--- Processing of complete files and streams    ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+static 
+Bool myfeof ( FILE* f )
+{
+   Int32 c = fgetc ( f );
+   if (c == EOF) return True;
+   ungetc ( c, f );
+   return False;
+}
+
+
+/*---------------------------------------------*/
+static 
+void compressStream ( FILE *stream, FILE *zStream )
+{
+   BZFILE* bzf = NULL;
+   UChar   ibuf[5000];
+   Int32   nIbuf;
+   UInt32  nbytes_in_lo32, nbytes_in_hi32;
+   UInt32  nbytes_out_lo32, nbytes_out_hi32;
+   Int32   bzerr, bzerr_dummy, ret;
+
+   SET_BINARY_MODE(stream);
+   SET_BINARY_MODE(zStream);
+
+   if (ferror(stream)) goto errhandler_io;
+   if (ferror(zStream)) goto errhandler_io;
+
+   bzf = BZ2_bzWriteOpen ( &bzerr, zStream, 
+                           blockSize100k, verbosity, workFactor );   
+   if (bzerr != BZ_OK) goto errhandler;
+
+   if (verbosity >= 2) fprintf ( stderr, "\n" );
+
+   while (True) {
+
+      if (myfeof(stream)) break;
+      nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream );
+      if (ferror(stream)) goto errhandler_io;
+      if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf );
+      if (bzerr != BZ_OK) goto errhandler;
+
+   }
+
+   BZ2_bzWriteClose64 ( &bzerr, bzf, 0, 
+                        &nbytes_in_lo32, &nbytes_in_hi32,
+                        &nbytes_out_lo32, &nbytes_out_hi32 );
+   if (bzerr != BZ_OK) goto errhandler;
+
+   if (ferror(zStream)) goto errhandler_io;
+   ret = fflush ( zStream );
+   if (ret == EOF) goto errhandler_io;
+   if (zStream != stdout) {
+      Int32 fd = fileno ( zStream );
+      if (fd < 0) goto errhandler_io;
+      applySavedFileAttrToOutputFile ( fd );
+      ret = fclose ( zStream );
+      outputHandleJustInCase = NULL;
+      if (ret == EOF) goto errhandler_io;
+   }
+   outputHandleJustInCase = NULL;
+   if (ferror(stream)) goto errhandler_io;
+   ret = fclose ( stream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (verbosity >= 1) {
+      if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0) {
+	 fprintf ( stderr, " no data compressed.\n");
+      } else {
+	 Char   buf_nin[32], buf_nout[32];
+	 UInt64 nbytes_in,   nbytes_out;
+	 double nbytes_in_d, nbytes_out_d;
+	 uInt64_from_UInt32s ( &nbytes_in, 
+			       nbytes_in_lo32, nbytes_in_hi32 );
+	 uInt64_from_UInt32s ( &nbytes_out, 
+			       nbytes_out_lo32, nbytes_out_hi32 );
+	 nbytes_in_d  = uInt64_to_double ( &nbytes_in );
+	 nbytes_out_d = uInt64_to_double ( &nbytes_out );
+	 uInt64_toAscii ( buf_nin, &nbytes_in );
+	 uInt64_toAscii ( buf_nout, &nbytes_out );
+	 fprintf ( stderr, "%6.3f:1, %6.3f bits/byte, "
+		   "%5.2f%% saved, %s in, %s out.\n",
+		   nbytes_in_d / nbytes_out_d,
+		   (8.0 * nbytes_out_d) / nbytes_in_d,
+		   100.0 * (1.0 - nbytes_out_d / nbytes_in_d),
+		   buf_nin,
+		   buf_nout
+		 );
+      }
+   }
+
+   return;
+
+   errhandler:
+   BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1, 
+                        &nbytes_in_lo32, &nbytes_in_hi32,
+                        &nbytes_out_lo32, &nbytes_out_hi32 );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_MEM_ERROR:
+         outOfMemory (); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      default:
+         panic ( "compress:unexpected error" );
+   }
+
+   panic ( "compress:end" );
+   /*notreached*/
+}
+
+
+
+/*---------------------------------------------*/
+static 
+Bool uncompressStream ( FILE *zStream, FILE *stream )
+{
+   BZFILE* bzf = NULL;
+   Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
+   UChar   obuf[5000];
+   UChar   unused[BZ_MAX_UNUSED];
+   Int32   nUnused;
+   void*   unusedTmpV;
+   UChar*  unusedTmp;
+
+   nUnused = 0;
+   streamNo = 0;
+
+   SET_BINARY_MODE(stream);
+   SET_BINARY_MODE(zStream);
+
+   if (ferror(stream)) goto errhandler_io;
+   if (ferror(zStream)) goto errhandler_io;
+
+   while (True) {
+
+      bzf = BZ2_bzReadOpen ( 
+               &bzerr, zStream, verbosity, 
+               (int)smallMode, unused, nUnused
+            );
+      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
+      streamNo++;
+
+      while (bzerr == BZ_OK) {
+         nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
+         if (bzerr == BZ_DATA_ERROR_MAGIC) goto trycat;
+         if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0)
+            fwrite ( obuf, sizeof(UChar), nread, stream );
+         if (ferror(stream)) goto errhandler_io;
+      }
+      if (bzerr != BZ_STREAM_END) goto errhandler;
+
+      BZ2_bzReadGetUnused ( &bzerr, bzf, &unusedTmpV, &nUnused );
+      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
+
+      unusedTmp = (UChar*)unusedTmpV;
+      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
+
+      BZ2_bzReadClose ( &bzerr, bzf );
+      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
+
+      if (nUnused == 0 && myfeof(zStream)) break;
+   }
+
+   closeok:
+   if (ferror(zStream)) goto errhandler_io;
+   if (stream != stdout) {
+      Int32 fd = fileno ( stream );
+      if (fd < 0) goto errhandler_io;
+      applySavedFileAttrToOutputFile ( fd );
+   }
+   ret = fclose ( zStream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (ferror(stream)) goto errhandler_io;
+   ret = fflush ( stream );
+   if (ret != 0) goto errhandler_io;
+   if (stream != stdout) {
+      ret = fclose ( stream );
+      outputHandleJustInCase = NULL;
+      if (ret == EOF) goto errhandler_io;
+   }
+   outputHandleJustInCase = NULL;
+   if (verbosity >= 2) fprintf ( stderr, "\n    " );
+   return True;
+
+   trycat: 
+   if (forceOverwrite) {
+      rewind(zStream);
+      while (True) {
+      	 if (myfeof(zStream)) break;
+      	 nread = fread ( obuf, sizeof(UChar), 5000, zStream );
+      	 if (ferror(zStream)) goto errhandler_io;
+      	 if (nread > 0) fwrite ( obuf, sizeof(UChar), nread, stream );
+      	 if (ferror(stream)) goto errhandler_io;
+      }
+      goto closeok;
+   }
+  
+   errhandler:
+   BZ2_bzReadClose ( &bzerr_dummy, bzf );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      case BZ_DATA_ERROR:
+         crcError();
+      case BZ_MEM_ERROR:
+         outOfMemory();
+      case BZ_UNEXPECTED_EOF:
+         compressedStreamEOF();
+      case BZ_DATA_ERROR_MAGIC:
+         if (zStream != stdin) fclose(zStream);
+         if (stream != stdout) fclose(stream);
+         if (streamNo == 1) {
+            return False;
+         } else {
+            if (noisy)
+            fprintf ( stderr, 
+                      "\n%s: %s: trailing garbage after EOF ignored\n",
+                      progName, inName );
+            return True;       
+         }
+      default:
+         panic ( "decompress:unexpected error" );
+   }
+
+   panic ( "decompress:end" );
+   return True; /*notreached*/
+}
+
+
+/*---------------------------------------------*/
+static 
+Bool testStream ( FILE *zStream )
+{
+   BZFILE* bzf = NULL;
+   Int32   bzerr, bzerr_dummy, ret, streamNo, i;
+   UChar   obuf[5000];
+   UChar   unused[BZ_MAX_UNUSED];
+   Int32   nUnused;
+   void*   unusedTmpV;
+   UChar*  unusedTmp;
+
+   nUnused = 0;
+   streamNo = 0;
+
+   SET_BINARY_MODE(zStream);
+   if (ferror(zStream)) goto errhandler_io;
+
+   while (True) {
+
+      bzf = BZ2_bzReadOpen ( 
+               &bzerr, zStream, verbosity, 
+               (int)smallMode, unused, nUnused
+            );
+      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
+      streamNo++;
+
+      while (bzerr == BZ_OK) {
+         BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
+         if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
+      }
+      if (bzerr != BZ_STREAM_END) goto errhandler;
+
+      BZ2_bzReadGetUnused ( &bzerr, bzf, &unusedTmpV, &nUnused );
+      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
+
+      unusedTmp = (UChar*)unusedTmpV;
+      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
+
+      BZ2_bzReadClose ( &bzerr, bzf );
+      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
+      if (nUnused == 0 && myfeof(zStream)) break;
+
+   }
+
+   if (ferror(zStream)) goto errhandler_io;
+   ret = fclose ( zStream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (verbosity >= 2) fprintf ( stderr, "\n    " );
+   return True;
+
+   errhandler:
+   BZ2_bzReadClose ( &bzerr_dummy, bzf );
+   if (verbosity == 0) 
+      fprintf ( stderr, "%s: %s: ", progName, inName );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      case BZ_DATA_ERROR:
+         fprintf ( stderr,
+                   "data integrity (CRC) error in data\n" );
+         return False;
+      case BZ_MEM_ERROR:
+         outOfMemory();
+      case BZ_UNEXPECTED_EOF:
+         fprintf ( stderr,
+                   "file ends unexpectedly\n" );
+         return False;
+      case BZ_DATA_ERROR_MAGIC:
+         if (zStream != stdin) fclose(zStream);
+         if (streamNo == 1) {
+          fprintf ( stderr, 
+                    "bad magic number (file not created by bzip2)\n" );
+            return False;
+         } else {
+            if (noisy)
+            fprintf ( stderr, 
+                      "trailing garbage after EOF ignored\n" );
+            return True;       
+         }
+      default:
+         panic ( "test:unexpected error" );
+   }
+
+   panic ( "test:end" );
+   return True; /*notreached*/
+}
+
+
+/*---------------------------------------------------*/
+/*--- Error [non-] handling grunge                ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+void setExit ( Int32 v )
+{
+   if (v > exitValue) exitValue = v;
+}
+
+
+/*---------------------------------------------*/
+static 
+void cadvise ( void )
+{
+   if (noisy)
+   fprintf (
+      stderr,
+      "\nIt is possible that the compressed file(s) have become corrupted.\n"
+        "You can use the -tvv option to test integrity of such files.\n\n"
+        "You can use the `bzip2recover' program to attempt to recover\n"
+        "data from undamaged sections of corrupted files.\n\n"
+    );
+}
+
+
+/*---------------------------------------------*/
+static 
+void showFileNames ( void )
+{
+   if (noisy)
+   fprintf (
+      stderr,
+      "\tInput file = %s, output file = %s\n",
+      inName, outName 
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void cleanUpAndFail ( Int32 ec )
+{
+   IntNative      retVal;
+   struct MY_STAT statBuf;
+
+   if ( srcMode == SM_F2F 
+        && opMode != OM_TEST
+        && deleteOutputOnInterrupt ) {
+
+      /* Check whether input file still exists.  Delete output file
+         only if input exists to avoid loss of data.  Joerg Prante, 5
+         January 2002.  (JRS 06-Jan-2002: other changes in 1.0.2 mean
+         this is less likely to happen.  But to be ultra-paranoid, we
+         do the check anyway.)  */
+      retVal = MY_STAT ( inName, &statBuf );
+      if (retVal == 0) {
+         if (noisy)
+            fprintf ( stderr, 
+                      "%s: Deleting output file %s, if it exists.\n",
+                      progName, outName );
+         if (outputHandleJustInCase != NULL)
+            fclose ( outputHandleJustInCase );
+         retVal = remove ( outName );
+         if (retVal != 0)
+            fprintf ( stderr,
+                      "%s: WARNING: deletion of output file "
+                      "(apparently) failed.\n",
+                      progName );
+      } else {
+         fprintf ( stderr,
+                   "%s: WARNING: deletion of output file suppressed\n",
+                    progName );
+         fprintf ( stderr,
+                   "%s:    since input file no longer exists.  Output file\n",
+                   progName );
+         fprintf ( stderr,
+                   "%s:    `%s' may be incomplete.\n",
+                   progName, outName );
+         fprintf ( stderr, 
+                   "%s:    I suggest doing an integrity test (bzip2 -tv)"
+                   " of it.\n",
+                   progName );
+      }
+   }
+
+   if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
+      fprintf ( stderr, 
+                "%s: WARNING: some files have not been processed:\n"
+                "%s:    %d specified on command line, %d not processed yet.\n\n",
+                progName, progName,
+                numFileNames, numFileNames - numFilesProcessed );
+   }
+   setExit(ec);
+   exit(exitValue);
+}
+
+
+/*---------------------------------------------*/
+static 
+void panic ( const Char* s )
+{
+   fprintf ( stderr,
+             "\n%s: PANIC -- internal consistency error:\n"
+             "\t%s\n"
+             "\tThis is a BUG.  Please report it to:\n"
+             "\tbzip2-devel@sourceware.org\n",
+             progName, s );
+   showFileNames();
+   cleanUpAndFail( 3 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void crcError ( void )
+{
+   fprintf ( stderr,
+             "\n%s: Data integrity error when decompressing.\n",
+             progName );
+   showFileNames();
+   cadvise();
+   cleanUpAndFail( 2 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void compressedStreamEOF ( void )
+{
+  if (noisy) {
+    fprintf ( stderr,
+	      "\n%s: Compressed file ends unexpectedly;\n\t"
+	      "perhaps it is corrupted?  *Possible* reason follows.\n",
+	      progName );
+    perror ( progName );
+    showFileNames();
+    cadvise();
+  }
+  cleanUpAndFail( 2 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void ioError ( void )
+{
+   fprintf ( stderr,
+             "\n%s: I/O or other error, bailing out.  "
+             "Possible reason follows.\n",
+             progName );
+   perror ( progName );
+   showFileNames();
+   cleanUpAndFail( 1 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void mySignalCatcher ( IntNative n )
+{
+   fprintf ( stderr,
+             "\n%s: Control-C or similar caught, quitting.\n",
+             progName );
+   cleanUpAndFail(1);
+}
+
+
+/*---------------------------------------------*/
+static 
+void mySIGSEGVorSIGBUScatcher ( IntNative n )
+{
+   const char *msg;
+   if (opMode == OM_Z)
+      msg = ": Caught a SIGSEGV or SIGBUS whilst compressing.\n"
+      "\n"
+      "   Possible causes are (most likely first):\n"
+      "   (1) This computer has unreliable memory or cache hardware\n"
+      "       (a surprisingly common problem; try a different machine.)\n"
+      "   (2) A bug in the compiler used to create this executable\n"
+      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
+      "   (3) A real bug in bzip2 -- I hope this should never be the case.\n"
+      "   The user's manual, Section 4.3, has more info on (1) and (2).\n"
+      "   \n"
+      "   If you suspect this is a bug in bzip2, or are unsure about (1)\n"
+      "   or (2), feel free to report it to: bzip2-devel@sourceware.org.\n"
+      "   Section 4.3 of the user's manual describes the info a useful\n"
+      "   bug report should have.  If the manual is available on your\n"
+      "   system, please try and read it before mailing me.  If you don't\n"
+      "   have the manual or can't be bothered to read it, mail me anyway.\n"
+      "\n";
+   else
+      msg = ": Caught a SIGSEGV or SIGBUS whilst decompressing.\n"
+      "\n"
+      "   Possible causes are (most likely first):\n"
+      "   (1) The compressed data is corrupted, and bzip2's usual checks\n"
+      "       failed to detect this.  Try bzip2 -tvv my_file.bz2.\n"
+      "   (2) This computer has unreliable memory or cache hardware\n"
+      "       (a surprisingly common problem; try a different machine.)\n"
+      "   (3) A bug in the compiler used to create this executable\n"
+      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
+      "   (4) A real bug in bzip2 -- I hope this should never be the case.\n"
+      "   The user's manual, Section 4.3, has more info on (2) and (3).\n"
+      "   \n"
+      "   If you suspect this is a bug in bzip2, or are unsure about (2)\n"
+      "   or (3), feel free to report it to: bzip2-devel@sourceware.org.\n"
+      "   Section 4.3 of the user's manual describes the info a useful\n"
+      "   bug report should have.  If the manual is available on your\n"
+      "   system, please try and read it before mailing me.  If you don't\n"
+      "   have the manual or can't be bothered to read it, mail me anyway.\n"
+      "\n";
+   write ( STDERR_FILENO, "\n", 1 );
+   write ( STDERR_FILENO, progName, strlen ( progName ) );
+   write ( STDERR_FILENO, msg, strlen ( msg ) );
+
+   msg = "\tInput file = ";
+   write ( STDERR_FILENO, msg, strlen (msg) );
+   write ( STDERR_FILENO, inName, strlen (inName) );
+   write ( STDERR_FILENO, "\n", 1 );
+   msg = "\tOutput file = ";
+   write ( STDERR_FILENO, msg, strlen (msg) );
+   write ( STDERR_FILENO, outName, strlen (outName) );
+   write ( STDERR_FILENO, "\n", 1 );
+
+   /* Don't call cleanupAndFail. If we ended up here something went
+      terribly wrong. Trying to clean up might fail spectacularly. */
+
+   if (opMode == OM_Z) setExit(3); else setExit(2);
+   _exit(exitValue);
+}
+
+
+/*---------------------------------------------*/
+static 
+void outOfMemory ( void )
+{
+   fprintf ( stderr,
+             "\n%s: couldn't allocate enough memory\n",
+             progName );
+   showFileNames();
+   cleanUpAndFail(1);
+}
+
+
+/*---------------------------------------------*/
+static 
+void configError ( void )
+{
+   fprintf ( stderr,
+             "bzip2: I'm not configured correctly for this platform!\n"
+             "\tI require Int32, Int16 and Char to have sizes\n"
+             "\tof 4, 2 and 1 bytes to run properly, and they don't.\n"
+             "\tProbably you can fix this by defining them correctly,\n"
+             "\tand recompiling.  Bye!\n" );
+   setExit(3);
+   exit(exitValue);
+}
+
+
+/*---------------------------------------------------*/
+/*--- The main driver machinery                   ---*/
+/*---------------------------------------------------*/
+
+/* All rather crufty.  The main problem is that input files
+   are stat()d multiple times before use.  This should be
+   cleaned up. 
+*/
+
+/*---------------------------------------------*/
+static 
+void pad ( Char *s )
+{
+   Int32 i;
+   if ( (Int32)strlen(s) >= longestFileName ) return;
+   for (i = 1; i <= longestFileName - (Int32)strlen(s); i++)
+      fprintf ( stderr, " " );
+}
+
+
+/*---------------------------------------------*/
+static 
+void copyFileName ( Char* to, Char* from ) 
+{
+   if ( strlen(from) > FILE_NAME_LEN-10 )  {
+      fprintf (
+         stderr,
+         "bzip2: file name\n`%s'\n"
+         "is suspiciously (more than %d chars) long.\n"
+         "Try using a reasonable file name instead.  Sorry! :-)\n",
+         from, FILE_NAME_LEN-10
+      );
+      setExit(1);
+      exit(exitValue);
+   }
+
+  strncpy(to,from,FILE_NAME_LEN-10);
+  to[FILE_NAME_LEN-10]='\0';
+}
+
+
+/*---------------------------------------------*/
+static 
+Bool fileExists ( Char* name )
+{
+   FILE *tmp   = fopen ( name, "rb" );
+   Bool exists = (tmp != NULL);
+   if (tmp != NULL) fclose ( tmp );
+   return exists;
+}
+
+
+/*---------------------------------------------*/
+/* Open an output file safely with O_EXCL and good permissions.
+   This avoids a race condition in versions < 1.0.2, in which
+   the file was first opened and then had its interim permissions
+   set safely.  We instead use open() to create the file with
+   the interim permissions required. (--- --- rw-).
+
+   For non-Unix platforms, if we are not worrying about
+   security issues, simple this simply behaves like fopen.
+*/
+static
+FILE* fopen_output_safely ( Char* name, const char* mode )
+{
+#  if BZ_UNIX
+   FILE*     fp;
+   IntNative fh;
+   fh = open(name, O_WRONLY|O_CREAT|O_EXCL, S_IWUSR|S_IRUSR);
+   if (fh == -1) return NULL;
+   fp = fdopen(fh, mode);
+   if (fp == NULL) close(fh);
+   return fp;
+#  else
+   return fopen(name, mode);
+#  endif
+}
+
+
+/*---------------------------------------------*/
+/*--
+  if in doubt, return True
+--*/
+static 
+Bool notAStandardFile ( Char* name )
+{
+   IntNative      i;
+   struct MY_STAT statBuf;
+
+   i = MY_LSTAT ( name, &statBuf );
+   if (i != 0) return True;
+   if (MY_S_ISREG(statBuf.st_mode)) return False;
+   return True;
+}
+
+
+/*---------------------------------------------*/
+/*--
+  rac 11/21/98 see if file has hard links to it
+--*/
+static 
+Int32 countHardLinks ( Char* name )
+{  
+   IntNative      i;
+   struct MY_STAT statBuf;
+
+   i = MY_LSTAT ( name, &statBuf );
+   if (i != 0) return 0;
+   return (statBuf.st_nlink - 1);
+}
+
+
+/*---------------------------------------------*/
+/* Copy modification date, access date, permissions and owner from the
+   source to destination file.  We have to copy this meta-info off
+   into fileMetaInfo before starting to compress / decompress it,
+   because doing it afterwards means we get the wrong access time.
+
+   To complicate matters, in compress() and decompress() below, the
+   sequence of tests preceding the call to saveInputFileMetaInfo()
+   involves calling fileExists(), which in turn establishes its result
+   by attempting to fopen() the file, and if successful, immediately
+   fclose()ing it again.  So we have to assume that the fopen() call
+   does not cause the access time field to be updated.
+
+   Reading of the man page for stat() (man 2 stat) on RedHat 7.2 seems
+   to imply that merely doing open() will not affect the access time.
+   Therefore we merely need to hope that the C library only does
+   open() as a result of fopen(), and not any kind of read()-ahead
+   cleverness.
+
+   It sounds pretty fragile to me.  Whether this carries across
+   robustly to arbitrary Unix-like platforms (or even works robustly
+   on this one, RedHat 7.2) is unknown to me.  Nevertheless ...  
+*/
+#if BZ_UNIX
+static 
+struct MY_STAT fileMetaInfo;
+#endif
+
+static 
+void saveInputFileMetaInfo ( Char *srcName )
+{
+#  if BZ_UNIX
+   IntNative retVal;
+   /* Note use of stat here, not lstat. */
+   retVal = MY_STAT( srcName, &fileMetaInfo );
+   ERROR_IF_NOT_ZERO ( retVal );
+#  endif
+}
+
+
+static 
+void applySavedTimeInfoToOutputFile ( Char *dstName )
+{
+#  if BZ_UNIX
+   IntNative      retVal;
+   struct utimbuf uTimBuf;
+
+   uTimBuf.actime = fileMetaInfo.st_atime;
+   uTimBuf.modtime = fileMetaInfo.st_mtime;
+
+   retVal = utime ( dstName, &uTimBuf );
+   ERROR_IF_NOT_ZERO ( retVal );
+#  endif
+}
+
+static 
+void applySavedFileAttrToOutputFile ( IntNative fd )
+{
+#  if BZ_UNIX
+   IntNative retVal;
+
+   retVal = fchmod ( fd, fileMetaInfo.st_mode );
+   ERROR_IF_NOT_ZERO ( retVal );
+
+   (void) fchown ( fd, fileMetaInfo.st_uid, fileMetaInfo.st_gid );
+   /* chown() will in many cases return with EPERM, which can
+      be safely ignored.
+   */
+#  endif
 }
+
+
+/*---------------------------------------------*/
+static 
+Bool containsDubiousChars ( Char* name )
+{
+#  if BZ_UNIX
+   /* On unix, files can contain any characters and the file expansion
+    * is performed by the shell.
+    */
+   return False;
+#  else /* ! BZ_UNIX */
+   /* On non-unix (Win* platforms), wildcard characters are not allowed in 
+    * filenames.
+    */
+   for (; *name != '\0'; name++)
+      if (*name == '?' || *name == '*') return True;
+   return False;
+#  endif /* BZ_UNIX */
+}
+
+
+/*---------------------------------------------*/
+#define BZ_N_SUFFIX_PAIRS 4
+
+const Char* zSuffix[BZ_N_SUFFIX_PAIRS] 
+   = { ".bz2", ".bz", ".tbz2", ".tbz" };
+const Char* unzSuffix[BZ_N_SUFFIX_PAIRS] 
+   = { "", "", ".tar", ".tar" };
+
+static 
+Bool hasSuffix ( Char* s, const Char* suffix )
+{
+   Int32 ns = strlen(s);
+   Int32 nx = strlen(suffix);
+   if (ns < nx) return False;
+   if (strcmp(s + ns - nx, suffix) == 0) return True;
+   return False;
+}
+
+static 
+Bool mapSuffix ( Char* name, 
+                 const Char* oldSuffix, 
+                 const Char* newSuffix )
+{
+   if (!hasSuffix(name,oldSuffix)) return False;
+   name[strlen(name)-strlen(oldSuffix)] = 0;
+   strcat ( name, newSuffix );
+   return True;
+}
+
+
+/*---------------------------------------------*/
+static 
+void compress ( Char *name )
+{
+   FILE  *inStr;
+   FILE  *outStr;
+   Int32 n, i;
+   struct MY_STAT statBuf;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "compress: bad modes\n" );
+
+   switch (srcMode) {
+      case SM_I2O: 
+         copyFileName ( inName, (Char*)"(stdin)" );
+         copyFileName ( outName, (Char*)"(stdout)" ); 
+         break;
+      case SM_F2F: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, name );
+         strcat ( outName, ".bz2" ); 
+         break;
+      case SM_F2O: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, (Char*)"(stdout)" ); 
+         break;
+   }
+
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+   for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) {
+      if (hasSuffix(inName, zSuffix[i])) {
+         if (noisy)
+         fprintf ( stderr, 
+                   "%s: Input file %s already has %s suffix.\n",
+                   progName, inName, zSuffix[i] );
+         setExit(1);
+         return;
+      }
+   }
+   if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
+      MY_STAT(inName, &statBuf);
+      if ( MY_S_ISDIR(statBuf.st_mode) ) {
+         fprintf( stderr,
+                  "%s: Input file %s is a directory.\n",
+                  progName,inName);
+         setExit(1);
+         return;
+      }
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
+      if (noisy)
+      fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F && fileExists ( outName ) ) {
+      if (forceOverwrite) {
+	 remove(outName);
+      } else {
+	 fprintf ( stderr, "%s: Output file %s already exists.\n",
+		   progName, outName );
+	 setExit(1);
+	 return;
+      }
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite &&
+        (n=countHardLinks ( inName )) > 0) {
+      fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
+                progName, inName, n, n > 1 ? "s" : "" );
+      setExit(1);
+      return;
+   }
+
+   if ( srcMode == SM_F2F ) {
+      /* Save the file's meta-info before we open it.  Doing it later
+         means we mess up the access times. */
+      saveInputFileMetaInfo ( inName );
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         inStr = stdin;
+         outStr = stdout;
+         if ( isatty ( fileno ( stdout ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't write compressed data to a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2O:
+         inStr = fopen ( inName, "rb" );
+         outStr = stdout;
+         if ( isatty ( fileno ( stdout ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't write compressed data to a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         };
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         outStr = fopen_output_safely ( outName, "wb" );
+         if ( outStr == NULL) {
+            fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
+                      progName, outName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         }
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            if ( outStr != NULL ) fclose ( outStr );
+            setExit(1);
+            return;
+         };
+         break;
+
+      default:
+         panic ( "compress: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr,  "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
+   outputHandleJustInCase = outStr;
+   deleteOutputOnInterrupt = True;
+   compressStream ( inStr, outStr );
+   outputHandleJustInCase = NULL;
+
+   /*--- If there was an I/O error, we won't get here. ---*/
+   if ( srcMode == SM_F2F ) {
+      applySavedTimeInfoToOutputFile ( outName );
+      deleteOutputOnInterrupt = False;
+      if ( !keepInputFiles ) {
+         IntNative retVal = remove ( inName );
+         ERROR_IF_NOT_ZERO ( retVal );
+      }
+   }
+
+   deleteOutputOnInterrupt = False;
+}
+
+
+/*---------------------------------------------*/
+static 
+void uncompress ( Char *name )
+{
+   FILE  *inStr;
+   FILE  *outStr;
+   Int32 n, i;
+   Bool  magicNumberOK;
+   Bool  cantGuess;
+   struct MY_STAT statBuf;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "uncompress: bad modes\n" );
+
+   cantGuess = False;
+   switch (srcMode) {
+      case SM_I2O: 
+         copyFileName ( inName, (Char*)"(stdin)" );
+         copyFileName ( outName, (Char*)"(stdout)" ); 
+         break;
+      case SM_F2F: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, name );
+         for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++)
+            if (mapSuffix(outName,zSuffix[i],unzSuffix[i]))
+               goto zzz; 
+         cantGuess = True;
+         strcat ( outName, ".out" );
+         break;
+      case SM_F2O: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, (Char*)"(stdout)" ); 
+         break;
+   }
+
+   zzz:
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
+      MY_STAT(inName, &statBuf);
+      if ( MY_S_ISDIR(statBuf.st_mode) ) {
+         fprintf( stderr,
+                  "%s: Input file %s is a directory.\n",
+                  progName,inName);
+         setExit(1);
+         return;
+      }
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
+      if (noisy)
+      fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( /* srcMode == SM_F2F implied && */ cantGuess ) {
+      if (noisy)
+      fprintf ( stderr, 
+                "%s: Can't guess original name for %s -- using %s\n",
+                progName, inName, outName );
+      /* just a warning, no return */
+   }   
+   if ( srcMode == SM_F2F && fileExists ( outName ) ) {
+      if (forceOverwrite) {
+	remove(outName);
+      } else {
+        fprintf ( stderr, "%s: Output file %s already exists.\n",
+                  progName, outName );
+        setExit(1);
+        return;
+      }
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite &&
+        (n=countHardLinks ( inName ) ) > 0) {
+      fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
+                progName, inName, n, n > 1 ? "s" : "" );
+      setExit(1);
+      return;
+   }
+
+   if ( srcMode == SM_F2F ) {
+      /* Save the file's meta-info before we open it.  Doing it later
+         means we mess up the access times. */
+      saveInputFileMetaInfo ( inName );
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         inStr = stdin;
+         outStr = stdout;
+         if ( isatty ( fileno ( stdin ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't read compressed data from a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2O:
+         inStr = fopen ( inName, "rb" );
+         outStr = stdout;
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
+                      progName, inName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         outStr = fopen_output_safely ( outName, "wb" );
+         if ( outStr == NULL) {
+            fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
+                      progName, outName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         }
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            if ( outStr != NULL ) fclose ( outStr );
+            setExit(1);
+            return;
+         };
+         break;
+
+      default:
+         panic ( "uncompress: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr, "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
+   outputHandleJustInCase = outStr;
+   deleteOutputOnInterrupt = True;
+   magicNumberOK = uncompressStream ( inStr, outStr );
+   outputHandleJustInCase = NULL;
+
+   /*--- If there was an I/O error, we won't get here. ---*/
+   if ( magicNumberOK ) {
+      if ( srcMode == SM_F2F ) {
+         applySavedTimeInfoToOutputFile ( outName );
+         deleteOutputOnInterrupt = False;
+         if ( !keepInputFiles ) {
+            IntNative retVal = remove ( inName );
+            ERROR_IF_NOT_ZERO ( retVal );
+         }
+      }
+   } else {
+      unzFailsExist = True;
+      deleteOutputOnInterrupt = False;
+      if ( srcMode == SM_F2F ) {
+         IntNative retVal = remove ( outName );
+         ERROR_IF_NOT_ZERO ( retVal );
+      }
+   }
+   deleteOutputOnInterrupt = False;
+
+   if ( magicNumberOK ) {
+      if (verbosity >= 1)
+         fprintf ( stderr, "done\n" );
+   } else {
+      setExit(2);
+      if (verbosity >= 1)
+         fprintf ( stderr, "not a bzip2 file.\n" ); else
+         fprintf ( stderr,
+                   "%s: %s is not a bzip2 file.\n",
+                   progName, inName );
+   }
+
+}
+
+
+/*---------------------------------------------*/
+static 
+void testf ( Char *name )
+{
+   FILE *inStr;
+   Bool allOK;
+   struct MY_STAT statBuf;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "testf: bad modes\n" );
+
+   copyFileName ( outName, (Char*)"(none)" );
+   switch (srcMode) {
+      case SM_I2O: copyFileName ( inName, (Char*)"(stdin)" ); break;
+      case SM_F2F: copyFileName ( inName, name ); break;
+      case SM_F2O: copyFileName ( inName, name ); break;
+   }
+
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O ) {
+      MY_STAT(inName, &statBuf);
+      if ( MY_S_ISDIR(statBuf.st_mode) ) {
+         fprintf( stderr,
+                  "%s: Input file %s is a directory.\n",
+                  progName,inName);
+         setExit(1);
+         return;
+      }
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         if ( isatty ( fileno ( stdin ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't read compressed data from a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         inStr = stdin;
+         break;
+
+      case SM_F2O: case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
+                      progName, inName, strerror(errno) );
+            setExit(1);
+            return;
+         };
+         break;
+
+      default:
+         panic ( "testf: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr, "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input handle is sane.  Do the Biz. ---*/
+   outputHandleJustInCase = NULL;
+   allOK = testStream ( inStr );
+
+   if (allOK && verbosity >= 1) fprintf ( stderr, "ok\n" );
+   if (!allOK) testFailsExist = True;
+}
+
+
+/*---------------------------------------------*/
+static 
+void license ( void )
+{
+   fprintf ( stderr,
+
+    "bzip2, a block-sorting file compressor.  "
+    "Version %s.\n"
+    "   \n"
+    "   Copyright (C) 1996-2019 by Julian Seward.\n"
+    "   \n"
+    "   This program is free software; you can redistribute it and/or modify\n"
+    "   it under the terms set out in the LICENSE file, which is included\n"
+    "   in the bzip2 source distribution.\n"
+    "   \n"
+    "   This program is distributed in the hope that it will be useful,\n"
+    "   but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "   LICENSE file for more details.\n"
+    "   \n",
+    BZ2_bzlibVersion()
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void usage ( Char *fullProgName )
+{
+   fprintf (
+      stderr,
+      "bzip2, a block-sorting file compressor.  "
+      "Version %s.\n"
+      "\n   usage: %s [flags and input files in any order]\n"
+      "\n"
+      "   -h --help           print this message\n"
+      "   -d --decompress     force decompression\n"
+      "   -z --compress       force compression\n"
+      "   -k --keep           keep (don't delete) input files\n"
+      "   -f --force          overwrite existing output files\n"
+      "   -t --test           test compressed file integrity\n"
+      "   -c --stdout         output to standard out\n"
+      "   -q --quiet          suppress noncritical error messages\n"
+      "   -v --verbose        be verbose (a 2nd -v gives more)\n"
+      "   -L --license        display software version & license\n"
+      "   -V --version        display software version & license\n"
+      "   -s --small          use less memory (at most 2500k)\n"
+      "   -1 .. -9            set block size to 100k .. 900k\n"
+      "   --fast              alias for -1\n"
+      "   --best              alias for -9\n"
+      "\n"
+      "   If invoked as `bzip2', default action is to compress.\n"
+      "              as `bunzip2',  default action is to decompress.\n"
+      "              as `bzcat', default action is to decompress to stdout.\n"
+      "\n"
+      "   If no file names are given, bzip2 compresses or decompresses\n"
+      "   from standard input to standard output.  You can combine\n"
+      "   short flags, so `-v -4' means the same as -v4 or -4v, &c.\n"
+#     if BZ_UNIX
+      "\n"
+#     endif
+      ,
+
+      BZ2_bzlibVersion(),
+      fullProgName
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void redundant ( Char* flag )
+{
+   fprintf ( 
+      stderr, 
+      "%s: %s is redundant in versions 0.9.5 and above\n",
+      progName, flag );
+}
+
+
+/*---------------------------------------------*/
+/*--
+  All the garbage from here to main() is purely to
+  implement a linked list of command-line arguments,
+  into which main() copies argv[1 .. argc-1].
+
+  The purpose of this exercise is to facilitate 
+  the expansion of wildcard characters * and ? in 
+  filenames for OSs which don't know how to do it
+  themselves, like MSDOS, Windows 95 and NT.
+
+  The actual Dirty Work is done by the platform-
+  specific macro APPEND_FILESPEC.
+--*/
+
+typedef
+   struct zzzz {
+      Char        *name;
+      struct zzzz *link;
+   }
+   Cell;
+
+
+/*---------------------------------------------*/
+static 
+void *myMalloc ( Int32 n )
+{
+   void* p;
+
+   p = malloc ( (size_t)n );
+   if (p == NULL) outOfMemory ();
+   return p;
+}
+
+
+/*---------------------------------------------*/
+static 
+Cell *mkCell ( void )
+{
+   Cell *c;
+
+   c = (Cell*) myMalloc ( sizeof ( Cell ) );
+   c->name = NULL;
+   c->link = NULL;
+   return c;
+}
+
+
+/*---------------------------------------------*/
+static 
+Cell *snocString ( Cell *root, Char *name )
+{
+   if (root == NULL) {
+      Cell *tmp = mkCell();
+      tmp->name = (Char*) myMalloc ( 5 + strlen(name) );
+      strcpy ( tmp->name, name );
+      return tmp;
+   } else {
+      Cell *tmp = root;
+      while (tmp->link != NULL) tmp = tmp->link;
+      tmp->link = snocString ( tmp->link, name );
+      return root;
+   }
+}
+
+
+/*---------------------------------------------*/
+static 
+void addFlagsFromEnvVar ( Cell** argList, Char* varName ) 
+{
+   Int32 i, j, k;
+   Char *envbase, *p;
+
+   envbase = getenv(varName);
+   if (envbase != NULL) {
+      p = envbase;
+      i = 0;
+      while (True) {
+         if (p[i] == 0) break;
+         p += i;
+         i = 0;
+         while (isspace((UChar)(p[0]))) p++;
+         while (p[i] != 0 && !isspace((UChar)(p[i]))) i++;
+         if (i > 0) {
+            k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10;
+            for (j = 0; j < k; j++) tmpName[j] = p[j];
+            tmpName[k] = 0;
+            APPEND_FLAG(*argList, tmpName);
+         }
+      }
+   }
+}
+
+
+/*---------------------------------------------*/
+#define ISFLAG(s) (strcmp(aa->name, (s))==0)
+
+IntNative main ( IntNative argc, Char *argv[] )
+{
+   Int32  i, j;
+   Char   *tmp;
+   Cell   *argList;
+   Cell   *aa;
+   Bool   decode;
+
+   /*-- Be really really really paranoid :-) --*/
+   if (sizeof(Int32) != 4 || sizeof(UInt32) != 4  ||
+       sizeof(Int16) != 2 || sizeof(UInt16) != 2  ||
+       sizeof(Char)  != 1 || sizeof(UChar)  != 1)
+      configError();
+
+   /*-- Initialise --*/
+   outputHandleJustInCase  = NULL;
+   smallMode               = False;
+   keepInputFiles          = False;
+   forceOverwrite          = False;
+   noisy                   = True;
+   verbosity               = 0;
+   blockSize100k           = 9;
+   testFailsExist          = False;
+   unzFailsExist           = False;
+   numFileNames            = 0;
+   numFilesProcessed       = 0;
+   workFactor              = 30;
+   deleteOutputOnInterrupt = False;
+   exitValue               = 0;
+   i = j = 0; /* avoid bogus warning from egcs-1.1.X */
+
+   /*-- Set up signal handlers for mem access errors --*/
+   signal (SIGSEGV, mySIGSEGVorSIGBUScatcher);
+#  if BZ_UNIX
+#  ifndef __DJGPP__
+   signal (SIGBUS,  mySIGSEGVorSIGBUScatcher);
+#  endif
+#  endif
+
+   copyFileName ( inName,  (Char*)"(none)" );
+   copyFileName ( outName, (Char*)"(none)" );
+
+   copyFileName ( progNameReally, argv[0] );
+   progName = &progNameReally[0];
+   for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++)
+      if (*tmp == PATH_SEP) progName = tmp + 1;
+
+
+   /*-- Copy flags from env var BZIP2, and 
+        expand filename wildcards in arg list.
+   --*/
+   argList = NULL;
+   addFlagsFromEnvVar ( &argList,  (Char*)"BZIP2" );
+   addFlagsFromEnvVar ( &argList,  (Char*)"BZIP" );
+   for (i = 1; i <= argc-1; i++)
+      APPEND_FILESPEC(argList, argv[i]);
+
+
+   /*-- Find the length of the longest filename --*/
+   longestFileName = 7;
+   numFileNames    = 0;
+   decode          = True;
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) { decode = False; continue; }
+      if (aa->name[0] == '-' && decode) continue;
+      numFileNames++;
+      if (longestFileName < (Int32)strlen(aa->name) )
+         longestFileName = (Int32)strlen(aa->name);
+   }
+
+
+   /*-- Determine source modes; flag handling may change this too. --*/
+   if (numFileNames == 0)
+      srcMode = SM_I2O; else srcMode = SM_F2F;
+
+
+   /*-- Determine what to do (compress/uncompress/test/cat). --*/
+   /*-- Note that subsequent flag handling may change this. --*/
+   opMode = OM_Z;
+
+   if ( (strstr ( progName, "unzip" ) != 0) ||
+        (strstr ( progName, "UNZIP" ) != 0) )
+      opMode = OM_UNZ;
+
+   if ( (strstr ( progName, "z2cat" ) != 0) ||
+        (strstr ( progName, "Z2CAT" ) != 0) ||
+        (strstr ( progName, "zcat" ) != 0)  ||
+        (strstr ( progName, "ZCAT" ) != 0) )  {
+      opMode = OM_UNZ;
+      srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O;
+   }
+
+
+   /*-- Look at the flags. --*/
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) break;
+      if (aa->name[0] == '-' && aa->name[1] != '-') {
+         for (j = 1; aa->name[j] != '\0'; j++) {
+            switch (aa->name[j]) {
+               case 'c': srcMode          = SM_F2O; break;
+               case 'd': opMode           = OM_UNZ; break;
+               case 'z': opMode           = OM_Z; break;
+               case 'f': forceOverwrite   = True; break;
+               case 't': opMode           = OM_TEST; break;
+               case 'k': keepInputFiles   = True; break;
+               case 's': smallMode        = True; break;
+               case 'q': noisy            = False; break;
+               case '1': blockSize100k    = 1; break;
+               case '2': blockSize100k    = 2; break;
+               case '3': blockSize100k    = 3; break;
+               case '4': blockSize100k    = 4; break;
+               case '5': blockSize100k    = 5; break;
+               case '6': blockSize100k    = 6; break;
+               case '7': blockSize100k    = 7; break;
+               case '8': blockSize100k    = 8; break;
+               case '9': blockSize100k    = 9; break;
+               case 'V':
+               case 'L': license();            break;
+               case 'v': verbosity++; break;
+               case 'h': usage ( progName );
+                         exit ( 0 );
+                         break;
+               default:  fprintf ( stderr, "%s: Bad flag `%s'\n",
+                                   progName, aa->name );
+                         usage ( progName );
+                         exit ( 1 );
+                         break;
+            }
+         }
+      }
+   }
+   
+   /*-- And again ... --*/
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) break;
+      if (ISFLAG("--stdout"))            srcMode          = SM_F2O;  else
+      if (ISFLAG("--decompress"))        opMode           = OM_UNZ;  else
+      if (ISFLAG("--compress"))          opMode           = OM_Z;    else
+      if (ISFLAG("--force"))             forceOverwrite   = True;    else
+      if (ISFLAG("--test"))              opMode           = OM_TEST; else
+      if (ISFLAG("--keep"))              keepInputFiles   = True;    else
+      if (ISFLAG("--small"))             smallMode        = True;    else
+      if (ISFLAG("--quiet"))             noisy            = False;   else
+      if (ISFLAG("--version"))           license();                  else
+      if (ISFLAG("--license"))           license();                  else
+      if (ISFLAG("--exponential"))       workFactor = 1;             else 
+      if (ISFLAG("--repetitive-best"))   redundant(aa->name);        else
+      if (ISFLAG("--repetitive-fast"))   redundant(aa->name);        else
+      if (ISFLAG("--fast"))              blockSize100k = 1;          else
+      if (ISFLAG("--best"))              blockSize100k = 9;          else
+      if (ISFLAG("--verbose"))           verbosity++;                else
+      if (ISFLAG("--help"))              { usage ( progName ); exit ( 0 ); }
+         else
+         if (strncmp ( aa->name, "--", 2) == 0) {
+            fprintf ( stderr, "%s: Bad flag `%s'\n", progName, aa->name );
+            usage ( progName );
+            exit ( 1 );
+         }
+   }
+
+   if (verbosity > 4) verbosity = 4;
+   if (opMode == OM_Z && smallMode && blockSize100k > 2) 
+      blockSize100k = 2;
+
+   if (opMode == OM_TEST && srcMode == SM_F2O) {
+      fprintf ( stderr, "%s: -c and -t cannot be used together.\n",
+                progName );
+      exit ( 1 );
+   }
+
+   if (srcMode == SM_F2O && numFileNames == 0)
+      srcMode = SM_I2O;
+
+   if (opMode != OM_Z) blockSize100k = 0;
+
+   if (srcMode == SM_F2F) {
+      signal (SIGINT,  mySignalCatcher);
+      signal (SIGTERM, mySignalCatcher);
+#     if BZ_UNIX
+      signal (SIGHUP,  mySignalCatcher);
+#     endif
+   }
+
+   if (opMode == OM_Z) {
+     if (srcMode == SM_I2O) {
+        compress ( NULL );
+     } else {
+        decode = True;
+        for (aa = argList; aa != NULL; aa = aa->link) {
+           if (ISFLAG("--")) { decode = False; continue; }
+           if (aa->name[0] == '-' && decode) continue;
+           numFilesProcessed++;
+           compress ( aa->name );
+        }
+     }
+   } 
+   else
+
+   if (opMode == OM_UNZ) {
+      unzFailsExist = False;
+      if (srcMode == SM_I2O) {
+         uncompress ( NULL );
+      } else {
+         decode = True;
+         for (aa = argList; aa != NULL; aa = aa->link) {
+            if (ISFLAG("--")) { decode = False; continue; }
+            if (aa->name[0] == '-' && decode) continue;
+            numFilesProcessed++;
+            uncompress ( aa->name );
+         }      
+      }
+      if (unzFailsExist) { 
+         setExit(2); 
+         exit(exitValue);
+      }
+   } 
+
+   else {
+      testFailsExist = False;
+      if (srcMode == SM_I2O) {
+         testf ( NULL );
+      } else {
+         decode = True;
+         for (aa = argList; aa != NULL; aa = aa->link) {
+	    if (ISFLAG("--")) { decode = False; continue; }
+            if (aa->name[0] == '-' && decode) continue;
+            numFilesProcessed++;
+            testf ( aa->name );
+	 }
+      }
+      if (testFailsExist) {
+	 if (noisy) {
+            fprintf ( stderr,
+               "\n"
+               "You can use the `bzip2recover' program to attempt to recover\n"
+               "data from undamaged sections of corrupted files.\n\n"
+            );
+	 }
+         setExit(2);
+         exit(exitValue);
+      }
+   }
+
+   /* Free the argument list memory to mollify leak detectors 
+      (eg) Purify, Checker.  Serves no other useful purpose.
+   */
+   aa = argList;
+   while (aa != NULL) {
+      Cell* aa2 = aa->link;
+      if (aa->name != NULL) free(aa->name);
+      free(aa);
+      aa = aa2;
+   }
+
+   return exitValue;
+}
+
+
+/*-----------------------------------------------------------*/
+/*--- end                                         bzip2.c ---*/
+/*-----------------------------------------------------------*/
diff --git a/sys/src/external/bzip2/bzip2recover.c b/sys/src/external/bzip2/bzip2recover.c
index 54dc8cc7..a8131e06 100644
--- a/sys/src/external/bzip2/bzip2recover.c
+++ b/sys/src/external/bzip2/bzip2recover.c
@@ -1,62 +1,53 @@
-
 /*-----------------------------------------------------------*/
 /*--- Block recoverer program for bzip2                   ---*/
 /*---                                      bzip2recover.c ---*/
 /*-----------------------------------------------------------*/
 
-/*--
-  This program is bzip2recover, a program to attempt data 
-  salvage from damaged files created by the accompanying
-  bzip2-1.0 program.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
---*/
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
 
-/*--
-  This program is a complete hack and should be rewritten
-  properly.  It isn't very complicated.
---*/
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+/* This program is a complete hack and should be rewritten properly.
+	 It isn't very complicated. */
 
 #include 
 #include 
 #include 
 #include 
 
+
+/* This program records bit locations in the file to be recovered.
+   That means that if 64-bit ints are not supported, we will not
+   be able to recover .bz2 files over 512MB (2^32 bits) long.
+   On GNU supported platforms, we take advantage of the 64-bit
+   int support to circumvent this problem.  Ditto MSVC.
+
+   This change occurred in version 1.0.2; all prior versions have
+   the 512MB limitation.
+*/
+#ifdef __GNUC__
+   typedef  unsigned long long int  MaybeUInt64;
+#  define MaybeUInt64_FMT "%Lu"
+#else
+#ifdef _MSC_VER
+   typedef  unsigned __int64  MaybeUInt64;
+#  define MaybeUInt64_FMT "%I64u"
+#else
+   typedef  unsigned int   MaybeUInt64;
+#  define MaybeUInt64_FMT "%u"
+#endif
+#endif
+
 typedef  unsigned int   UInt32;
 typedef  int            Int32;
 typedef  unsigned char  UChar;
@@ -66,20 +57,32 @@ typedef  unsigned char  Bool;
 #define False   ((Bool)0)
 
 
-Char inFileName[2000];
-Char outFileName[2000];
-Char progName[2000];
+#define BZ_MAX_FILENAME 2000
+
+Char inFileName[BZ_MAX_FILENAME];
+Char outFileName[BZ_MAX_FILENAME];
+Char progName[BZ_MAX_FILENAME];
+
+MaybeUInt64 bytesOut = 0;
+MaybeUInt64 bytesIn  = 0;
+
 
-UInt32 bytesOut = 0;
-UInt32 bytesIn  = 0;
+/*---------------------------------------------------*/
+/*--- Header bytes                                ---*/
+/*---------------------------------------------------*/
 
+#define BZ_HDR_B 0x42                         /* 'B' */
+#define BZ_HDR_Z 0x5a                         /* 'Z' */
+#define BZ_HDR_h 0x68                         /* 'h' */
+#define BZ_HDR_0 0x30                         /* '0' */
+ 
 
 /*---------------------------------------------------*/
 /*--- I/O errors                                  ---*/
 /*---------------------------------------------------*/
 
 /*---------------------------------------------*/
-void readError ( void )
+static void readError ( void )
 {
    fprintf ( stderr,
              "%s: I/O error reading `%s', possible reason follows.\n",
@@ -92,7 +95,7 @@ void readError ( void )
 
 
 /*---------------------------------------------*/
-void writeError ( void )
+static void writeError ( void )
 {
    fprintf ( stderr,
              "%s: I/O error reading `%s', possible reason follows.\n",
@@ -105,7 +108,7 @@ void writeError ( void )
 
 
 /*---------------------------------------------*/
-void mallocFail ( Int32 n )
+static void mallocFail ( Int32 n )
 {
    fprintf ( stderr,
              "%s: malloc failed on request for %d bytes.\n",
@@ -116,6 +119,23 @@ void mallocFail ( Int32 n )
 }
 
 
+/*---------------------------------------------*/
+static void tooManyBlocks ( Int32 max_handled_blocks )
+{
+   fprintf ( stderr,
+             "%s: `%s' appears to contain more than %d blocks\n",
+            progName, inFileName, max_handled_blocks );
+   fprintf ( stderr,
+             "%s: and cannot be handled.  To fix, increase\n",
+             progName );
+   fprintf ( stderr, 
+             "%s: BZ_MAX_HANDLED_BLOCKS in bzip2recover.c, and recompile.\n",
+             progName );
+   exit ( 1 );
+}
+
+
+
 /*---------------------------------------------------*/
 /*--- Bit stream I/O                              ---*/
 /*---------------------------------------------------*/
@@ -131,7 +151,7 @@ typedef
 
 
 /*---------------------------------------------*/
-BitStream* bsOpenReadStream ( FILE* stream )
+static BitStream* bsOpenReadStream ( FILE* stream )
 {
    BitStream *bs = malloc ( sizeof(BitStream) );
    if (bs == NULL) mallocFail ( sizeof(BitStream) );
@@ -144,7 +164,7 @@ BitStream* bsOpenReadStream ( FILE* stream )
 
 
 /*---------------------------------------------*/
-BitStream* bsOpenWriteStream ( FILE* stream )
+static BitStream* bsOpenWriteStream ( FILE* stream )
 {
    BitStream *bs = malloc ( sizeof(BitStream) );
    if (bs == NULL) mallocFail ( sizeof(BitStream) );
@@ -157,7 +177,7 @@ BitStream* bsOpenWriteStream ( FILE* stream )
 
 
 /*---------------------------------------------*/
-void bsPutBit ( BitStream* bs, Int32 bit )
+static void bsPutBit ( BitStream* bs, Int32 bit )
 {
    if (bs->buffLive == 8) {
       Int32 retVal = putc ( (UChar) bs->buffer, bs->handle );
@@ -176,7 +196,7 @@ void bsPutBit ( BitStream* bs, Int32 bit )
 /*--
    Returns 0 or 1, or 2 to indicate EOF.
 --*/
-Int32 bsGetBit ( BitStream* bs )
+static Int32 bsGetBit ( BitStream* bs )
 {
    if (bs->buffLive > 0) {
       bs->buffLive --;
@@ -195,7 +215,7 @@ Int32 bsGetBit ( BitStream* bs )
 
 
 /*---------------------------------------------*/
-void bsClose ( BitStream* bs )
+static void bsClose ( BitStream* bs )
 {
    Int32 retVal;
 
@@ -219,7 +239,7 @@ void bsClose ( BitStream* bs )
 
 
 /*---------------------------------------------*/
-void bsPutUChar ( BitStream* bs, UChar c )
+static void bsPutUChar ( BitStream* bs, UChar c )
 {
    Int32 i;
    for (i = 7; i >= 0; i--)
@@ -228,7 +248,7 @@ void bsPutUChar ( BitStream* bs, UChar c )
 
 
 /*---------------------------------------------*/
-void bsPutUInt32 ( BitStream* bs, UInt32 c )
+static void bsPutUInt32 ( BitStream* bs, UInt32 c )
 {
    Int32 i;
 
@@ -238,7 +258,7 @@ void bsPutUInt32 ( BitStream* bs, UInt32 c )
 
 
 /*---------------------------------------------*/
-Bool endsInBz2 ( Char* name )
+static Bool endsInBz2 ( Char* name )
 {
    Int32 n = strlen ( name );
    if (n <= 4) return False;
@@ -254,40 +274,76 @@ Bool endsInBz2 ( Char* name )
 /*---                                             ---*/
 /*---------------------------------------------------*/
 
+/* This logic isn't really right when it comes to Cygwin. */
+#ifdef _WIN32
+#  define  BZ_SPLIT_SYM  '\\'  /* path splitter on Windows platform */
+#else
+#  define  BZ_SPLIT_SYM  '/'   /* path splitter on Unix platform */
+#endif
+
 #define BLOCK_HEADER_HI  0x00003141UL
 #define BLOCK_HEADER_LO  0x59265359UL
 
 #define BLOCK_ENDMARK_HI 0x00001772UL
 #define BLOCK_ENDMARK_LO 0x45385090UL
 
+/* Increase if necessary.  However, a .bz2 file with > 50000 blocks
+   would have an uncompressed size of at least 40GB, so the chances
+   are low you'll need to up this.
+*/
+#define BZ_MAX_HANDLED_BLOCKS 50000
 
-UInt32 bStart[20000];
-UInt32 bEnd[20000];
-UInt32 rbStart[20000];
-UInt32 rbEnd[20000];
+MaybeUInt64 bStart [BZ_MAX_HANDLED_BLOCKS];
+MaybeUInt64 bEnd   [BZ_MAX_HANDLED_BLOCKS];
+MaybeUInt64 rbStart[BZ_MAX_HANDLED_BLOCKS];
+MaybeUInt64 rbEnd  [BZ_MAX_HANDLED_BLOCKS];
 
 Int32 main ( Int32 argc, Char** argv )
 {
    FILE*       inFile;
    FILE*       outFile;
    BitStream*  bsIn, *bsWr;
-   Int32       currBlock, b, wrBlock;
-   UInt32      bitsRead;
-   Int32       rbCtr;
-
+   Int32       b, wrBlock, currBlock, rbCtr;
+   MaybeUInt64 bitsRead;
 
    UInt32      buffHi, buffLo, blockCRC;
    Char*       p;
 
-   strncpy ( progName, argv[0], sizeof progName );
-   progName[sizeof progName-1] = 0;
+   strncpy ( progName, argv[0], BZ_MAX_FILENAME-1);
+   progName[BZ_MAX_FILENAME-1]='\0';
    inFileName[0] = outFileName[0] = 0;
 
-   fprintf ( stderr, "bzip2recover 1.0: extracts blocks from damaged .bz2 files.\n" );
+   fprintf ( stderr, 
+             "bzip2recover 1.0.8: extracts blocks from damaged .bz2 files.\n" );
 
    if (argc != 2) {
       fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n",
                         progName, progName );
+      switch (sizeof(MaybeUInt64)) {
+         case 8:
+            fprintf(stderr, 
+                    "\trestrictions on size of recovered file: None\n");
+            break;
+         case 4:
+            fprintf(stderr, 
+                    "\trestrictions on size of recovered file: 512 MB\n");
+            fprintf(stderr, 
+                    "\tto circumvent, recompile with MaybeUInt64 as an\n"
+                    "\tunsigned 64-bit int.\n");
+            break;
+         default:
+            fprintf(stderr, 
+                    "\tsizeof(MaybeUInt64) is not 4 or 8 -- "
+                    "configuration error.\n");
+            break;
+      }
+      exit(1);
+   }
+
+   if (strlen(argv[1]) >= BZ_MAX_FILENAME-20) {
+      fprintf ( stderr, 
+                "%s: supplied filename is suspiciously (>= %d chars) long.  Bye!\n",
+                progName, (int)strlen(argv[1]) );
       exit(1);
    }
 
@@ -317,7 +373,8 @@ Int32 main ( Int32 argc, Char** argv )
             (bitsRead - bStart[currBlock]) >= 40) {
             bEnd[currBlock] = bitsRead-1;
             if (currBlock > 0)
-               fprintf ( stderr, "   block %d runs from %d to %d (incomplete)\n",
+               fprintf ( stderr, "   block %d runs from " MaybeUInt64_FMT 
+                                 " to " MaybeUInt64_FMT " (incomplete)\n",
                          currBlock,  bStart[currBlock], bEnd[currBlock] );
          } else
             currBlock--;
@@ -331,17 +388,22 @@ Int32 main ( Int32 argc, Char** argv )
            ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI 
              && buffLo == BLOCK_ENDMARK_LO)
          ) {
-         if (bitsRead > 49)
-            bEnd[currBlock] = bitsRead-49; else
+         if (bitsRead > 49) {
+            bEnd[currBlock] = bitsRead-49;
+         } else {
             bEnd[currBlock] = 0;
+         }
          if (currBlock > 0 &&
 	     (bEnd[currBlock] - bStart[currBlock]) >= 130) {
-            fprintf ( stderr, "   block %d runs from %d to %d\n",
+            fprintf ( stderr, "   block %d runs from " MaybeUInt64_FMT 
+                              " to " MaybeUInt64_FMT "\n",
                       rbCtr+1,  bStart[currBlock], bEnd[currBlock] );
             rbStart[rbCtr] = bStart[currBlock];
             rbEnd[rbCtr] = bEnd[currBlock];
             rbCtr++;
          }
+         if (currBlock >= BZ_MAX_HANDLED_BLOCKS)
+            tooManyBlocks(BZ_MAX_HANDLED_BLOCKS);
          currBlock++;
 
          bStart[currBlock] = bitsRead;
@@ -396,15 +458,31 @@ Int32 main ( Int32 argc, Char** argv )
             bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 );
             bsPutUInt32 ( bsWr, blockCRC );
             bsClose ( bsWr );
+            outFile = NULL;
          }
          if (wrBlock >= rbCtr) break;
          wrBlock++;
       } else
       if (bitsRead == rbStart[wrBlock]) {
-         outFileName[0] = 0;
-         sprintf ( outFileName, "rec%4d", wrBlock+1 );
-         for (p = outFileName; *p != 0; p++) if (*p == ' ') *p = '0';
-         strcat ( outFileName, inFileName );
+         /* Create the output file name, correctly handling leading paths. 
+            (31.10.2001 by Sergey E. Kusikov) */
+         Char* split;
+         Int32 ofs, k;
+         for (k = 0; k < BZ_MAX_FILENAME; k++) 
+            outFileName[k] = 0;
+         strcpy (outFileName, inFileName);
+         split = strrchr (outFileName, BZ_SPLIT_SYM);
+         if (split == NULL) {
+            split = outFileName;
+         } else {
+            ++split;
+	 }
+	 /* Now split points to the start of the basename. */
+         ofs  = split - outFileName;
+         sprintf (split, "rec%5d", wrBlock+1);
+         for (p = split; *p != 0; p++) if (*p == ' ') *p = '0';
+         strcat (outFileName, inFileName + ofs);
+
          if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" );
 
          fprintf ( stderr, "   writing block %d to `%s' ...\n",
@@ -417,8 +495,10 @@ Int32 main ( Int32 argc, Char** argv )
             exit(1);
          }
          bsWr = bsOpenWriteStream ( outFile );
-         bsPutUChar ( bsWr, 'B' ); bsPutUChar ( bsWr, 'Z' );
-         bsPutUChar ( bsWr, 'h' ); bsPutUChar ( bsWr, '9' );
+         bsPutUChar ( bsWr, BZ_HDR_B );    
+         bsPutUChar ( bsWr, BZ_HDR_Z );    
+         bsPutUChar ( bsWr, BZ_HDR_h );    
+         bsPutUChar ( bsWr, BZ_HDR_0 + 9 );
          bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 );
          bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 );
          bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 );
diff --git a/sys/src/external/bzip2/bzlib.c b/sys/src/external/bzip2/bzlib.c
new file mode 100644
index 00000000..100873c7
--- /dev/null
+++ b/sys/src/external/bzip2/bzlib.c
@@ -0,0 +1,1572 @@
+
+/*-------------------------------------------------------------*/
+/*--- Library top-level functions.                          ---*/
+/*---                                               bzlib.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+/* CHANGES
+   0.9.0    -- original version.
+   0.9.0a/b -- no changes in this file.
+   0.9.0c   -- made zero-length BZ_FLUSH work correctly in bzCompress().
+     fixed bzWrite/bzRead to ignore zero-length requests.
+     fixed bzread to correctly handle read requests after EOF.
+     wrong parameter order in call to bzDecompressInit in
+     bzBuffToBuffDecompress.  Fixed.
+*/
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+/*--- Compression stuff                           ---*/
+/*---------------------------------------------------*/
+
+
+/*---------------------------------------------------*/
+#ifndef BZ_NO_STDIO
+void BZ2_bz__AssertH__fail ( int errcode )
+{
+   fprintf(stderr, 
+      "\n\nbzip2/libbzip2: internal error number %d.\n"
+      "This is a bug in bzip2/libbzip2, %s.\n"
+      "Please report it to: bzip2-devel@sourceware.org.  If this happened\n"
+      "when you were using some program which uses libbzip2 as a\n"
+      "component, you should also report this bug to the author(s)\n"
+      "of that program.  Please make an effort to report this bug;\n"
+      "timely and accurate bug reports eventually lead to higher\n"
+      "quality software.  Thanks.\n\n",
+      errcode,
+      BZ2_bzlibVersion()
+   );
+
+   if (errcode == 1007) {
+   fprintf(stderr,
+      "\n*** A special note about internal error number 1007 ***\n"
+      "\n"
+      "Experience suggests that a common cause of i.e. 1007\n"
+      "is unreliable memory or other hardware.  The 1007 assertion\n"
+      "just happens to cross-check the results of huge numbers of\n"
+      "memory reads/writes, and so acts (unintendedly) as a stress\n"
+      "test of your memory system.\n"
+      "\n"
+      "I suggest the following: try compressing the file again,\n"
+      "possibly monitoring progress in detail with the -vv flag.\n"
+      "\n"
+      "* If the error cannot be reproduced, and/or happens at different\n"
+      "  points in compression, you may have a flaky memory system.\n"
+      "  Try a memory-test program.  I have used Memtest86\n"
+      "  (www.memtest86.com).  At the time of writing it is free (GPLd).\n"
+      "  Memtest86 tests memory much more thorougly than your BIOSs\n"
+      "  power-on test, and may find failures that the BIOS doesn't.\n"
+      "\n"
+      "* If the error can be repeatably reproduced, this is a bug in\n"
+      "  bzip2, and I would very much like to hear about it.  Please\n"
+      "  let me know, and, ideally, save a copy of the file causing the\n"
+      "  problem -- without which I will be unable to investigate it.\n"
+      "\n"
+   );
+   }
+
+   exit(3);
+}
+#endif
+
+
+/*---------------------------------------------------*/
+static
+int bz_config_ok ( void )
+{
+   if (sizeof(int)   != 4) return 0;
+   if (sizeof(short) != 2) return 0;
+   if (sizeof(char)  != 1) return 0;
+   return 1;
+}
+
+
+/*---------------------------------------------------*/
+static
+void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
+{
+   void* v = malloc ( items * size );
+   return v;
+}
+
+static
+void default_bzfree ( void* opaque, void* addr )
+{
+   if (addr != NULL) free ( addr );
+}
+
+
+/*---------------------------------------------------*/
+static
+void prepare_new_block ( EState* s )
+{
+   Int32 i;
+   s->nblock = 0;
+   s->numZ = 0;
+   s->state_out_pos = 0;
+   BZ_INITIALISE_CRC ( s->blockCRC );
+   for (i = 0; i < 256; i++) s->inUse[i] = False;
+   s->blockNo++;
+}
+
+
+/*---------------------------------------------------*/
+static
+void init_RL ( EState* s )
+{
+   s->state_in_ch  = 256;
+   s->state_in_len = 0;
+}
+
+
+static
+Bool isempty_RL ( EState* s )
+{
+   if (s->state_in_ch < 256 && s->state_in_len > 0)
+      return False; else
+      return True;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressInit) 
+                    ( bz_stream* strm, 
+                     int        blockSize100k,
+                     int        verbosity,
+                     int        workFactor )
+{
+   Int32   n;
+   EState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL || 
+       blockSize100k < 1 || blockSize100k > 9 ||
+       workFactor < 0 || workFactor > 250)
+     return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(EState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm = strm;
+
+   s->arr1 = NULL;
+   s->arr2 = NULL;
+   s->ftab = NULL;
+
+   n       = 100000 * blockSize100k;
+   s->arr1 = BZALLOC( n                  * sizeof(UInt32) );
+   s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
+   s->ftab = BZALLOC( 65537              * sizeof(UInt32) );
+
+   if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
+      if (s->arr1 != NULL) BZFREE(s->arr1);
+      if (s->arr2 != NULL) BZFREE(s->arr2);
+      if (s->ftab != NULL) BZFREE(s->ftab);
+      if (s       != NULL) BZFREE(s);
+      return BZ_MEM_ERROR;
+   }
+
+   s->blockNo           = 0;
+   s->state             = BZ_S_INPUT;
+   s->mode              = BZ_M_RUNNING;
+   s->combinedCRC       = 0;
+   s->blockSize100k     = blockSize100k;
+   s->nblockMAX         = 100000 * blockSize100k - 19;
+   s->verbosity         = verbosity;
+   s->workFactor        = workFactor;
+
+   s->block             = (UChar*)s->arr2;
+   s->mtfv              = (UInt16*)s->arr1;
+   s->zbits             = NULL;
+   s->ptr               = (UInt32*)s->arr1;
+
+   strm->state          = s;
+   strm->total_in_lo32  = 0;
+   strm->total_in_hi32  = 0;
+   strm->total_out_lo32 = 0;
+   strm->total_out_hi32 = 0;
+   init_RL ( s );
+   prepare_new_block ( s );
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+static
+void add_pair_to_block ( EState* s )
+{
+   Int32 i;
+   UChar ch = (UChar)(s->state_in_ch);
+   for (i = 0; i < s->state_in_len; i++) {
+      BZ_UPDATE_CRC( s->blockCRC, ch );
+   }
+   s->inUse[s->state_in_ch] = True;
+   switch (s->state_in_len) {
+      case 1:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 2:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 3:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      default:
+         s->inUse[s->state_in_len-4] = True;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = ((UChar)(s->state_in_len-4));
+         s->nblock++;
+         break;
+   }
+}
+
+
+/*---------------------------------------------------*/
+static
+void flush_RL ( EState* s )
+{
+   if (s->state_in_ch < 256) add_pair_to_block ( s );
+   init_RL ( s );
+}
+
+
+/*---------------------------------------------------*/
+#define ADD_CHAR_TO_BLOCK(zs,zchh0)               \
+{                                                 \
+   UInt32 zchh = (UInt32)(zchh0);                 \
+   /*-- fast track the common case --*/           \
+   if (zchh != zs->state_in_ch &&                 \
+       zs->state_in_len == 1) {                   \
+      UChar ch = (UChar)(zs->state_in_ch);        \
+      BZ_UPDATE_CRC( zs->blockCRC, ch );          \
+      zs->inUse[zs->state_in_ch] = True;          \
+      zs->block[zs->nblock] = (UChar)ch;          \
+      zs->nblock++;                               \
+      zs->state_in_ch = zchh;                     \
+   }                                              \
+   else                                           \
+   /*-- general, uncommon cases --*/              \
+   if (zchh != zs->state_in_ch ||                 \
+      zs->state_in_len == 255) {                  \
+      if (zs->state_in_ch < 256)                  \
+         add_pair_to_block ( zs );                \
+      zs->state_in_ch = zchh;                     \
+      zs->state_in_len = 1;                       \
+   } else {                                       \
+      zs->state_in_len++;                         \
+   }                                              \
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_input_until_stop ( EState* s )
+{
+   Bool progress_in = False;
+
+   if (s->mode == BZ_M_RUNNING) {
+
+      /*-- fast track the common case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+      }
+
+   } else {
+
+      /*-- general, uncommon case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         /*-- flush/finish end? --*/
+         if (s->avail_in_expect == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+         s->avail_in_expect--;
+      }
+   }
+   return progress_in;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_output_until_stop ( EState* s )
+{
+   Bool progress_out = False;
+
+   while (True) {
+
+      /*-- no output space? --*/
+      if (s->strm->avail_out == 0) break;
+
+      /*-- block done? --*/
+      if (s->state_out_pos >= s->numZ) break;
+
+      progress_out = True;
+      *(s->strm->next_out) = s->zbits[s->state_out_pos];
+      s->state_out_pos++;
+      s->strm->avail_out--;
+      s->strm->next_out++;
+      s->strm->total_out_lo32++;
+      if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+   }
+
+   return progress_out;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool handle_compress ( bz_stream* strm )
+{
+   Bool progress_in  = False;
+   Bool progress_out = False;
+   EState* s = strm->state;
+   
+   while (True) {
+
+      if (s->state == BZ_S_OUTPUT) {
+         progress_out |= copy_output_until_stop ( s );
+         if (s->state_out_pos < s->numZ) break;
+         if (s->mode == BZ_M_FINISHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+         prepare_new_block ( s );
+         s->state = BZ_S_INPUT;
+         if (s->mode == BZ_M_FLUSHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+      }
+
+      if (s->state == BZ_S_INPUT) {
+         progress_in |= copy_input_until_stop ( s );
+         if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
+            flush_RL ( s );
+            BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->nblock >= s->nblockMAX) {
+            BZ2_compressBlock ( s, False );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->strm->avail_in == 0) {
+            break;
+         }
+      }
+
+   }
+
+   return progress_in || progress_out;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
+{
+   Bool progress;
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   preswitch:
+   switch (s->mode) {
+
+      case BZ_M_IDLE:
+         return BZ_SEQUENCE_ERROR;
+
+      case BZ_M_RUNNING:
+         if (action == BZ_RUN) {
+            progress = handle_compress ( strm );
+            return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
+         } 
+         else
+	 if (action == BZ_FLUSH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FLUSHING;
+            goto preswitch;
+         }
+         else
+         if (action == BZ_FINISH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FINISHING;
+            goto preswitch;
+         }
+         else 
+            return BZ_PARAM_ERROR;
+
+      case BZ_M_FLUSHING:
+         if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
+         s->mode = BZ_M_RUNNING;
+         return BZ_RUN_OK;
+
+      case BZ_M_FINISHING:
+         if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (!progress) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FINISH_OK;
+         s->mode = BZ_M_IDLE;
+         return BZ_STREAM_END;
+   }
+   return BZ_OK; /*--not reached--*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressEnd)  ( bz_stream *strm )
+{
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->arr1 != NULL) BZFREE(s->arr1);
+   if (s->arr2 != NULL) BZFREE(s->arr2);
+   if (s->ftab != NULL) BZFREE(s->ftab);
+   BZFREE(strm->state);
+
+   strm->state = NULL;   
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/*--- Decompression stuff                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressInit) 
+                     ( bz_stream* strm, 
+                       int        verbosity,
+                       int        small )
+{
+   DState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   if (small != 0 && small != 1) return BZ_PARAM_ERROR;
+   if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
+
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(DState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm                  = strm;
+   strm->state              = s;
+   s->state                 = BZ_X_MAGIC_1;
+   s->bsLive                = 0;
+   s->bsBuff                = 0;
+   s->calculatedCombinedCRC = 0;
+   strm->total_in_lo32      = 0;
+   strm->total_in_hi32      = 0;
+   strm->total_out_lo32     = 0;
+   strm->total_out_hi32     = 0;
+   s->smallDecompress       = (Bool)small;
+   s->ll4                   = NULL;
+   s->ll16                  = NULL;
+   s->tt                    = NULL;
+   s->currBlockNo           = 0;
+   s->verbosity             = verbosity;
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/* Return  True iff data corruption is discovered.
+   Returns False if there is no problem.
+*/
+static
+Bool unRLE_obuf_to_output_FAST ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+               
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      /* restore */
+      UInt32        c_calculatedBlockCRC = s->calculatedBlockCRC;
+      UChar         c_state_out_ch       = s->state_out_ch;
+      Int32         c_state_out_len      = s->state_out_len;
+      Int32         c_nblock_used        = s->nblock_used;
+      Int32         c_k0                 = s->k0;
+      UInt32*       c_tt                 = s->tt;
+      UInt32        c_tPos               = s->tPos;
+      char*         cs_next_out          = s->strm->next_out;
+      unsigned int  cs_avail_out         = s->strm->avail_out;
+      Int32         ro_blockSize100k     = s->blockSize100k;
+      /* end restore */
+
+      UInt32       avail_out_INIT = cs_avail_out;
+      Int32        s_save_nblockPP = s->save_nblock+1;
+      unsigned int total_out_lo32_old;
+
+      while (True) {
+
+         /* try to finish existing run */
+         if (c_state_out_len > 0) {
+            while (True) {
+               if (cs_avail_out == 0) goto return_notr;
+               if (c_state_out_len == 1) break;
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               c_state_out_len--;
+               cs_next_out++;
+               cs_avail_out--;
+            }
+            s_state_out_len_eq_one:
+            {
+               if (cs_avail_out == 0) { 
+                  c_state_out_len = 1; goto return_notr;
+               };
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               cs_next_out++;
+               cs_avail_out--;
+            }
+         }   
+         /* Only caused by corrupt data stream? */
+         if (c_nblock_used > s_save_nblockPP)
+            return True;
+
+         /* can a new run be started? */
+         if (c_nblock_used == s_save_nblockPP) {
+            c_state_out_len = 0; goto return_notr;
+         };   
+         c_state_out_ch = c_k0;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (k1 != c_k0) { 
+            c_k0 = k1; goto s_state_out_len_eq_one; 
+         };
+         if (c_nblock_used == s_save_nblockPP) 
+            goto s_state_out_len_eq_one;
+   
+         c_state_out_len = 2;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         c_state_out_len = 3;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         c_state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST_C(c_k0); c_nblock_used++;
+      }
+
+      return_notr:
+      total_out_lo32_old = s->strm->total_out_lo32;
+      s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
+      if (s->strm->total_out_lo32 < total_out_lo32_old)
+         s->strm->total_out_hi32++;
+
+      /* save */
+      s->calculatedBlockCRC = c_calculatedBlockCRC;
+      s->state_out_ch       = c_state_out_ch;
+      s->state_out_len      = c_state_out_len;
+      s->nblock_used        = c_nblock_used;
+      s->k0                 = c_k0;
+      s->tt                 = c_tt;
+      s->tPos               = c_tPos;
+      s->strm->next_out     = cs_next_out;
+      s->strm->avail_out    = cs_avail_out;
+      /* end save */
+   }
+   return False;
+}
+
+
+
+/*---------------------------------------------------*/
+__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
+{
+   Int32 nb, na, mid;
+   nb = 0;
+   na = 256;
+   do {
+      mid = (nb + na) >> 1;
+      if (indx >= cftab[mid]) nb = mid; else na = mid;
+   }
+   while (na - nb != 1);
+   return nb;
+}
+
+
+/*---------------------------------------------------*/
+/* Return  True iff data corruption is discovered.
+   Returns False if there is no problem.
+*/
+static
+Bool unRLE_obuf_to_output_SMALL ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return False;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return False;
+
+         /* Only caused by corrupt data stream? */
+         if (s->nblock_used > s->save_nblock+1)
+            return True;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); s->nblock_used++;
+      }
+
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
+{
+   Bool    corrupt;
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   while (True) {
+      if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
+      if (s->state == BZ_X_OUTPUT) {
+         if (s->smallDecompress)
+            corrupt = unRLE_obuf_to_output_SMALL ( s ); else
+            corrupt = unRLE_obuf_to_output_FAST  ( s );
+         if (corrupt) return BZ_DATA_ERROR;
+         if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
+            BZ_FINALISE_CRC ( s->calculatedBlockCRC );
+            if (s->verbosity >= 3) 
+               VPrintf2 ( " {0x%08x, 0x%08x}", s->storedBlockCRC, 
+                          s->calculatedBlockCRC );
+            if (s->verbosity >= 2) VPrintf0 ( "]" );
+            if (s->calculatedBlockCRC != s->storedBlockCRC)
+               return BZ_DATA_ERROR;
+            s->calculatedCombinedCRC 
+               = (s->calculatedCombinedCRC << 1) | 
+                    (s->calculatedCombinedCRC >> 31);
+            s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
+            s->state = BZ_X_BLKHDR_1;
+         } else {
+            return BZ_OK;
+         }
+      }
+      if (s->state >= BZ_X_MAGIC_1) {
+         Int32 r = BZ2_decompress ( s );
+         if (r == BZ_STREAM_END) {
+            if (s->verbosity >= 3)
+               VPrintf2 ( "\n    combined CRCs: stored = 0x%08x, computed = 0x%08x", 
+                          s->storedCombinedCRC, s->calculatedCombinedCRC );
+            if (s->calculatedCombinedCRC != s->storedCombinedCRC)
+               return BZ_DATA_ERROR;
+            return r;
+         }
+         if (s->state != BZ_X_OUTPUT) return r;
+      }
+   }
+
+   AssertH ( 0, 6001 );
+
+   return 0;  /*NOTREACHED*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressEnd)  ( bz_stream *strm )
+{
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->tt   != NULL) BZFREE(s->tt);
+   if (s->ll16 != NULL) BZFREE(s->ll16);
+   if (s->ll4  != NULL) BZFREE(s->ll4);
+
+   BZFREE(strm->state);
+   strm->state = NULL;
+
+   return BZ_OK;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+/*--- File I/O stuff                              ---*/
+/*---------------------------------------------------*/
+
+#define BZ_SETERR(eee)                    \
+{                                         \
+   if (bzerror != NULL) *bzerror = eee;   \
+   if (bzf != NULL) bzf->lastErr = eee;   \
+}
+
+typedef 
+   struct {
+      FILE*     handle;
+      Char      buf[BZ_MAX_UNUSED];
+      Int32     bufN;
+      Bool      writing;
+      bz_stream strm;
+      Int32     lastErr;
+      Bool      initialisedOk;
+   }
+   bzFile;
+
+
+/*---------------------------------------------*/
+static Bool myfeof ( FILE* f )
+{
+   Int32 c = fgetc ( f );
+   if (c == EOF) return True;
+   ungetc ( c, f );
+   return False;
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzWriteOpen) 
+                    ( int*  bzerror,      
+                      FILE* f, 
+                      int   blockSize100k, 
+                      int   verbosity,
+                      int   workFactor )
+{
+   Int32   ret;
+   bzFile* bzf = NULL;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL ||
+       (blockSize100k < 1 || blockSize100k > 9) ||
+       (workFactor < 0 || workFactor > 250) ||
+       (verbosity < 0 || verbosity > 4))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+   bzf->initialisedOk = False;
+   bzf->bufN          = 0;
+   bzf->handle        = f;
+   bzf->writing       = True;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+
+   if (workFactor == 0) workFactor = 30;
+   ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = 0;
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWrite)
+             ( int*    bzerror, 
+               BZFILE* b, 
+               void*   buf, 
+               int     len )
+{
+   Int32 n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return; };
+
+   bzf->strm.avail_in = len;
+   bzf->strm.next_in  = buf;
+
+   while (True) {
+      bzf->strm.avail_out = BZ_MAX_UNUSED;
+      bzf->strm.next_out = bzf->buf;
+      ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
+      if (ret != BZ_RUN_OK)
+         { BZ_SETERR(ret); return; };
+
+      if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+         n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+         n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                       n, bzf->handle );
+         if (n != n2 || ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return; };
+      }
+
+      if (bzf->strm.avail_in == 0)
+         { BZ_SETERR(BZ_OK); return; };
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWriteClose)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in,
+                    unsigned int* nbytes_out )
+{
+   BZ2_bzWriteClose64 ( bzerror, b, abandon, 
+                        nbytes_in, NULL, nbytes_out, NULL );
+}
+
+
+void BZ_API(BZ2_bzWriteClose64)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in_lo32,
+                    unsigned int* nbytes_in_hi32,
+                    unsigned int* nbytes_out_lo32,
+                    unsigned int* nbytes_out_hi32 )
+{
+   Int32   n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
+   if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
+   if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
+   if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
+
+   if ((!abandon) && bzf->lastErr == BZ_OK) {
+      while (True) {
+         bzf->strm.avail_out = BZ_MAX_UNUSED;
+         bzf->strm.next_out = bzf->buf;
+         ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
+         if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
+            { BZ_SETERR(ret); return; };
+
+         if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+            n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+            n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                          n, bzf->handle );
+            if (n != n2 || ferror(bzf->handle))
+               { BZ_SETERR(BZ_IO_ERROR); return; };
+         }
+
+         if (ret == BZ_STREAM_END) break;
+      }
+   }
+
+   if ( !abandon && !ferror ( bzf->handle ) ) {
+      fflush ( bzf->handle );
+      if (ferror(bzf->handle))
+         { BZ_SETERR(BZ_IO_ERROR); return; };
+   }
+
+   if (nbytes_in_lo32 != NULL)
+      *nbytes_in_lo32 = bzf->strm.total_in_lo32;
+   if (nbytes_in_hi32 != NULL)
+      *nbytes_in_hi32 = bzf->strm.total_in_hi32;
+   if (nbytes_out_lo32 != NULL)
+      *nbytes_out_lo32 = bzf->strm.total_out_lo32;
+   if (nbytes_out_hi32 != NULL)
+      *nbytes_out_hi32 = bzf->strm.total_out_hi32;
+
+   BZ_SETERR(BZ_OK);
+   BZ2_bzCompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzReadOpen) 
+                   ( int*  bzerror, 
+                     FILE* f, 
+                     int   verbosity,
+                     int   small,
+                     void* unused,
+                     int   nUnused )
+{
+   bzFile* bzf = NULL;
+   int     ret;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL || 
+       (small != 0 && small != 1) ||
+       (verbosity < 0 || verbosity > 4) ||
+       (unused == NULL && nUnused != 0) ||
+       (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL) 
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+
+   bzf->initialisedOk = False;
+   bzf->handle        = f;
+   bzf->bufN          = 0;
+   bzf->writing       = False;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+   
+   while (nUnused > 0) {
+      bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
+      unused = ((void*)( 1 + ((UChar*)(unused))  ));
+      nUnused--;
+   }
+
+   ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = bzf->bufN;
+   bzf->strm.next_in  = bzf->buf;
+
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
+{
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+
+   if (bzf->initialisedOk)
+      (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzRead) 
+           ( int*    bzerror, 
+             BZFILE* b, 
+             void*   buf, 
+             int     len )
+{
+   Int32   n, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return 0; };
+
+   bzf->strm.avail_out = len;
+   bzf->strm.next_out = buf;
+
+   while (True) {
+
+      if (ferror(bzf->handle)) 
+         { BZ_SETERR(BZ_IO_ERROR); return 0; };
+
+      if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) {
+         n = fread ( bzf->buf, sizeof(UChar), 
+                     BZ_MAX_UNUSED, bzf->handle );
+         if (ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return 0; };
+         bzf->bufN = n;
+         bzf->strm.avail_in = bzf->bufN;
+         bzf->strm.next_in = bzf->buf;
+      }
+
+      ret = BZ2_bzDecompress ( &(bzf->strm) );
+
+      if (ret != BZ_OK && ret != BZ_STREAM_END)
+         { BZ_SETERR(ret); return 0; };
+
+      if (ret == BZ_OK && myfeof(bzf->handle) && 
+          bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
+         { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
+
+      if (ret == BZ_STREAM_END)
+         { BZ_SETERR(BZ_STREAM_END);
+           return len - bzf->strm.avail_out; };
+      if (bzf->strm.avail_out == 0)
+         { BZ_SETERR(BZ_OK); return len; };
+      
+   }
+
+   return 0; /*not reached*/
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadGetUnused) 
+                     ( int*    bzerror, 
+                       BZFILE* b, 
+                       void**  unused, 
+                       int*    nUnused )
+{
+   bzFile* bzf = (bzFile*)b;
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (bzf->lastErr != BZ_STREAM_END)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (unused == NULL || nUnused == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+
+   BZ_SETERR(BZ_OK);
+   *nUnused = bzf->strm.avail_in;
+   *unused = bzf->strm.next_in;
+}
+#endif
+
+
+/*---------------------------------------------------*/
+/*--- Misc convenience stuff                      ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffCompress) 
+                         ( char*         dest, 
+                           unsigned int* destLen,
+                           char*         source, 
+                           unsigned int  sourceLen,
+                           int           blockSize100k, 
+                           int           verbosity, 
+                           int           workFactor )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       blockSize100k < 1 || blockSize100k > 9 ||
+       verbosity < 0 || verbosity > 4 ||
+       workFactor < 0 || workFactor > 250) 
+      return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzCompressInit ( &strm, blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzCompress ( &strm, BZ_FINISH );
+   if (ret == BZ_FINISH_OK) goto output_overflow;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;   
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow:
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OUTBUFF_FULL;
+
+   errhandler:
+   BZ2_bzCompressEnd ( &strm );
+   return ret;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffDecompress) 
+                           ( char*         dest, 
+                             unsigned int* destLen,
+                             char*         source, 
+                             unsigned int  sourceLen,
+                             int           small,
+                             int           verbosity )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       (small != 0 && small != 1) ||
+       verbosity < 0 || verbosity > 4) 
+          return BZ_PARAM_ERROR;
+
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzDecompress ( &strm );
+   if (ret == BZ_OK) goto output_overflow_or_eof;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;
+   BZ2_bzDecompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow_or_eof:
+   if (strm.avail_out > 0) {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_UNEXPECTED_EOF;
+   } else {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_OUTBUFF_FULL;
+   };      
+
+   errhandler:
+   BZ2_bzDecompressEnd ( &strm );
+   return ret; 
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
+   to support better zlib compatibility.
+   This code is not _officially_ part of libbzip2 (yet);
+   I haven't tested it, documented it, or considered the
+   threading-safeness of it.
+   If this code breaks, please contact both Yoshioka and me.
+--*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+/*--
+   return version like "0.9.5d, 4-Sept-1999".
+--*/
+const char * BZ_API(BZ2_bzlibVersion)(void)
+{
+   return BZ_VERSION;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+
+#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
+#   include 
+#   include 
+#   define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
+#else
+#   define SET_BINARY_MODE(file)
+#endif
+static
+BZFILE * bzopen_or_bzdopen
+               ( const char *path,   /* no use when bzdopen */
+                 int fd,             /* no use when bzdopen */
+                 const char *mode,
+                 int open_mode)      /* bzopen: 0, bzdopen:1 */
+{
+   int    bzerr;
+   char   unused[BZ_MAX_UNUSED];
+   int    blockSize100k = 9;
+   int    writing       = 0;
+   char   mode2[10]     = "";
+   FILE   *fp           = NULL;
+   BZFILE *bzfp         = NULL;
+   int    verbosity     = 0;
+   int    workFactor    = 30;
+   int    smallMode     = 0;
+   int    nUnused       = 0; 
+
+   if (mode == NULL) return NULL;
+   while (*mode) {
+      switch (*mode) {
+      case 'r':
+         writing = 0; break;
+      case 'w':
+         writing = 1; break;
+      case 's':
+         smallMode = 1; break;
+      default:
+         if (isdigit((unsigned char)(*mode))) {
+            blockSize100k = *mode-BZ_HDR_0;
+         }
+      }
+      mode++;
+   }
+   strcat(mode2, writing ? "w" : "r" );
+   strcat(mode2,"b");   /* binary mode */
+
+   if (open_mode==0) {
+      if (path==NULL || strcmp(path,"")==0) {
+        fp = (writing ? stdout : stdin);
+        SET_BINARY_MODE(fp);
+      } else {
+        fp = fopen(path,mode2);
+      }
+   } else {
+#ifdef BZ_STRICT_ANSI
+      fp = NULL;
+#else
+      fp = fdopen(fd,mode2);
+#endif
+   }
+   if (fp == NULL) return NULL;
+
+   if (writing) {
+      /* Guard against total chaos and anarchy -- JRS */
+      if (blockSize100k < 1) blockSize100k = 1;
+      if (blockSize100k > 9) blockSize100k = 9; 
+      bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
+                             verbosity,workFactor);
+   } else {
+      bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
+                            unused,nUnused);
+   }
+   if (bzfp == NULL) {
+      if (fp != stdin && fp != stdout) fclose(fp);
+      return NULL;
+   }
+   return bzfp;
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   open file for read or write.
+      ex) bzopen("file","w9")
+      case path="" or NULL => use stdin or stdout.
+--*/
+BZFILE * BZ_API(BZ2_bzopen)
+               ( const char *path,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
+}
+
+
+/*---------------------------------------------------*/
+BZFILE * BZ_API(BZ2_bzdopen)
+               ( int fd,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
+{
+   int bzerr, nread;
+   if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
+   nread = BZ2_bzRead(&bzerr,b,buf,len);
+   if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
+      return nread;
+   } else {
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
+{
+   int bzerr;
+
+   BZ2_bzWrite(&bzerr,b,buf,len);
+   if(bzerr == BZ_OK){
+      return len;
+   }else{
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzflush) (BZFILE *b)
+{
+   /* do nothing now... */
+   return 0;
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzclose) (BZFILE* b)
+{
+   int bzerr;
+   FILE *fp;
+   
+   if (b==NULL) {return;}
+   fp = ((bzFile *)b)->handle;
+   if(((bzFile*)b)->writing){
+      BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
+      if(bzerr != BZ_OK){
+         BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
+      }
+   }else{
+      BZ2_bzReadClose(&bzerr,b);
+   }
+   if(fp!=stdin && fp!=stdout){
+      fclose(fp);
+   }
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   return last error code 
+--*/
+static const char *bzerrorstrings[] = {
+       "OK"
+      ,"SEQUENCE_ERROR"
+      ,"PARAM_ERROR"
+      ,"MEM_ERROR"
+      ,"DATA_ERROR"
+      ,"DATA_ERROR_MAGIC"
+      ,"IO_ERROR"
+      ,"UNEXPECTED_EOF"
+      ,"OUTBUFF_FULL"
+      ,"CONFIG_ERROR"
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+};
+
+
+const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
+{
+   int err = ((bzFile *)b)->lastErr;
+
+   if(err>0) err = 0;
+   *errnum = err;
+   return bzerrorstrings[err*-1];
+}
+#endif
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/sys/src/external/bzip2/lib/bzlib.h b/sys/src/external/bzip2/bzlib.h
similarity index 55%
rename from sys/src/external/bzip2/lib/bzlib.h
rename to sys/src/external/bzip2/bzlib.h
index 0ece4e8a..5012fa7a 100644
--- a/sys/src/external/bzip2/lib/bzlib.h
+++ b/sys/src/external/bzip2/bzlib.h
@@ -1,77 +1,27 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
 
 /*-------------------------------------------------------------*/
 /*--- Public header file for the library.                   ---*/
 /*---                                               bzlib.h ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
 
 #ifndef _BZLIB_H
 #define _BZLIB_H
+#pragma lib "/$M/lib/ape/libbz2.a"
 
 #ifdef __cplusplus
 extern "C" {
@@ -121,8 +71,12 @@ typedef
 #define BZ_EXPORT
 #endif
 
+#ifndef BZ_NO_STDIO
+/* Need a definitition for FILE */
+#include 
+#endif
+
 #ifdef _WIN32
-#   include 
 #   include 
 #   ifdef small
       /* windows.h define small to char */
@@ -176,6 +130,76 @@ BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) (
 
 
 
+/*-- High(er) level library functions --*/
+
+#ifndef BZ_NO_STDIO
+#define BZ_MAX_UNUSED 5000
+
+typedef void BZFILE;
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( 
+      int*  bzerror,   
+      FILE* f, 
+      int   verbosity, 
+      int   small,
+      void* unused,    
+      int   nUnused 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( 
+      int*    bzerror, 
+      BZFILE* b 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void**  unused,  
+      int*    nUnused 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzRead) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( 
+      int*  bzerror,      
+      FILE* f, 
+      int   blockSize100k, 
+      int   verbosity, 
+      int   workFactor 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWrite) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in, 
+      unsigned int* nbytes_out 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in_lo32, 
+      unsigned int* nbytes_in_hi32, 
+      unsigned int* nbytes_out_lo32, 
+      unsigned int* nbytes_out_hi32
+   );
+#endif
+
+
 /*-- Utility functions --*/
 
 BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( 
@@ -199,8 +223,7 @@ BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) (
 
 
 /*--
-   Code contributed by Yoshioka Tsuneo
-   (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
+   Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
    to support better zlib compatibility.
    This code is not _officially_ part of libbzip2 (yet);
    I haven't tested it, documented it, or considered the
@@ -212,6 +235,43 @@ BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) (
       void
    );
 
+#ifndef BZ_NO_STDIO
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) (
+      const char *path,
+      const char *mode
+   );
+
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) (
+      int        fd,
+      const char *mode
+   );
+         
+BZ_EXTERN int BZ_API(BZ2_bzread) (
+      BZFILE* b, 
+      void* buf, 
+      int len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzwrite) (
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzflush) (
+      BZFILE* b
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzclose) (
+      BZFILE* b
+   );
+
+BZ_EXTERN const char * BZ_API(BZ2_bzerror) (
+      BZFILE *b, 
+      int    *errnum
+   );
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/sys/src/external/bzip2/lib/bzlib_private.h b/sys/src/external/bzip2/bzlib_private.h
similarity index 77%
rename from sys/src/external/bzip2/lib/bzlib_private.h
rename to sys/src/external/bzip2/bzlib_private.h
index d9dd0a01..3755a6f7 100644
--- a/sys/src/external/bzip2/lib/bzlib_private.h
+++ b/sys/src/external/bzip2/bzlib_private.h
@@ -1,103 +1,115 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
 
 /*-------------------------------------------------------------*/
 /*--- Private header file for the library.                  ---*/
 /*---                                       bzlib_private.h ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
 
 
 #ifndef _BZLIB_PRIVATE_H
 #define _BZLIB_PRIVATE_H
 
+#include 
+
+#ifndef BZ_NO_STDIO
+#include 
+#include 
+#include 
+#endif
+
+#include "bzlib.h"
+
+
+
 /*-- General stuff. --*/
 
-#define BZ_VERSION  "1.0.1, 23-June-2000"
+#define BZ_VERSION  "1.0.8, 13-Jul-2019"
+
+typedef char            Char;
+typedef unsigned char   Bool;
+typedef unsigned char   UChar;
+typedef int             Int32;
+typedef unsigned int    UInt32;
+typedef short           Int16;
+typedef unsigned short  UInt16;
+
+#define True  ((Bool)1)
+#define False ((Bool)0)
 
 #ifndef __GNUC__
 #define __inline__  /* */
 #endif 
 
-/* these #defines can be overridden by bzlib_stdio.h */
+#ifndef BZ_NO_STDIO
+
+extern void BZ2_bz__AssertH__fail ( int errcode );
+#define AssertH(cond,errcode) \
+   { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
+
+#if BZ_DEBUG
+#define AssertD(cond,msg) \
+   { if (!(cond)) {       \
+      fprintf ( stderr,   \
+        "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
+      exit(1); \
+   }}
+#else
+#define AssertD(cond,msg) /* */
+#endif
+
+#define VPrintf0(zf) \
+   fprintf(stderr,zf)
+#define VPrintf1(zf,za1) \
+   fprintf(stderr,zf,za1)
+#define VPrintf2(zf,za1,za2) \
+   fprintf(stderr,zf,za1,za2)
+#define VPrintf3(zf,za1,za2,za3) \
+   fprintf(stderr,zf,za1,za2,za3)
+#define VPrintf4(zf,za1,za2,za3,za4) \
+   fprintf(stderr,zf,za1,za2,za3,za4)
+#define VPrintf5(zf,za1,za2,za3,za4,za5) \
+   fprintf(stderr,zf,za1,za2,za3,za4,za5)
+
+#else
+
 extern void bz_internal_error ( int errcode );
 #define AssertH(cond,errcode) \
    { if (!(cond)) bz_internal_error ( errcode ); }
-#define AssertD(cond,msg) /* */
-#define VPrintf0(zf) /* */
-#define VPrintf1(zf,za1) /* */
-#define VPrintf2(zf,za1,za2) /* */
-#define VPrintf3(zf,za1,za2,za3) /* */
-#define VPrintf4(zf,za1,za2,za3,za4) /* */
-#define VPrintf5(zf,za1,za2,za3,za4,za5) /* */
+#define AssertD(cond,msg)                do { } while (0)
+#define VPrintf0(zf)                     do { } while (0)
+#define VPrintf1(zf,za1)                 do { } while (0)
+#define VPrintf2(zf,za1,za2)             do { } while (0)
+#define VPrintf3(zf,za1,za2,za3)         do { } while (0)
+#define VPrintf4(zf,za1,za2,za3,za4)     do { } while (0)
+#define VPrintf5(zf,za1,za2,za3,za4,za5) do { } while (0)
+
+#endif
+
 
 #define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
 #define BZFREE(ppp)  (strm->bzfree)(strm->opaque,(ppp))
 
 
+/*-- Header bytes. --*/
+
+#define BZ_HDR_B 0x42   /* 'B' */
+#define BZ_HDR_Z 0x5a   /* 'Z' */
+#define BZ_HDR_h 0x68   /* 'h' */
+#define BZ_HDR_0 0x30   /* '0' */
+  
 /*-- Constants for the back end. --*/
 
 #define BZ_MAX_ALPHA_SIZE 258
@@ -430,11 +442,15 @@ typedef
 /*-- Macros for decompression. --*/
 
 #define BZ_GET_FAST(cccc)                     \
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
     s->tPos = s->tt[s->tPos];                 \
     cccc = (UChar)(s->tPos & 0xff);           \
     s->tPos >>= 8;
 
 #define BZ_GET_FAST_C(cccc)                   \
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (c_tPos >= (UInt32)100000 * (UInt32)ro_blockSize100k) return True; \
     c_tPos = c_tt[c_tPos];                    \
     cccc = (UChar)(c_tPos & 0xff);            \
     c_tPos >>= 8;
@@ -457,8 +473,10 @@ typedef
    (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
 
 #define BZ_GET_SMALL(cccc)                            \
-      cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
-      s->tPos = GET_LL(s->tPos);
+    /* c_tPos is unsigned, hence test < 0 is pointless. */ \
+    if (s->tPos >= (UInt32)100000 * (UInt32)s->blockSize100k) return True; \
+    cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
+    s->tPos = GET_LL(s->tPos);
 
 
 /*-- externs for decompression. --*/
@@ -476,20 +494,15 @@ BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
 
 #endif
 
-/* sometimes not including  makes this necessary */
+
+/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
+
+#ifdef BZ_NO_STDIO
 #ifndef NULL
 #define NULL 0
 #endif
+#endif
 
-/* internal library functions */
-extern int
-bz_config_ok( void );
-
-extern void*
-default_bzalloc( void*, Int32, Int32 );
-
-extern void
-default_bzfree( void*, void* );
 
 /*-------------------------------------------------------------*/
 /*--- end                                   bzlib_private.h ---*/
diff --git a/sys/src/external/bzip2/bzmore b/sys/src/external/bzip2/bzmore
new file mode 100644
index 00000000..d3140434
--- /dev/null
+++ b/sys/src/external/bzip2/bzmore
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+# Bzmore wrapped for bzip2, 
+# adapted from zmore by Philippe Troin  for Debian GNU/Linux.
+
+PATH="/usr/bin:$PATH"; export PATH
+
+prog=`echo $0 | sed 's|.*/||'`
+case "$prog" in
+	*less)	more=less	;;
+	*)	more=more       ;;
+esac
+
+if test "`echo -n a`" = "-n a"; then
+  # looks like a SysV system:
+  n1=''; n2='\c'
+else
+  n1='-n'; n2=''
+fi
+oldtty=`stty -g 2>/dev/null`
+if stty -cbreak 2>/dev/null; then
+  cb='cbreak'; ncb='-cbreak'
+else
+  # 'stty min 1' resets eof to ^a on both SunOS and SysV!
+  cb='min 1 -icanon'; ncb='icanon eof ^d'
+fi
+if test $? -eq 0 -a -n "$oldtty"; then
+   trap 'stty $oldtty 2>/dev/null; exit' 0 2 3 5 10 13 15
+else
+   trap 'stty $ncb echo 2>/dev/null; exit' 0 2 3 5 10 13 15
+fi
+
+if test $# = 0; then
+    if test -t 0; then
+	echo usage: $prog files...
+    else
+	bzip2 -cdfq | eval $more
+    fi
+else
+    FIRST=1
+    for FILE
+    do
+	if test $FIRST -eq 0; then
+		echo $n1 "--More--(Next file: $FILE)$n2"
+		stty $cb -echo 2>/dev/null
+		ANS=`dd bs=1 count=1 2>/dev/null` 
+		stty $ncb echo 2>/dev/null
+		echo " "
+		if test "$ANS" = 'e' -o "$ANS" = 'q'; then
+			exit
+		fi
+	fi
+	if test "$ANS" != 's'; then
+		echo "------> $FILE <------"
+		bzip2 -cdfq "$FILE" | eval $more
+	fi
+	if test -t; then
+		FIRST=0
+	fi
+    done
+fi
diff --git a/sys/src/external/bzip2/bzmore.1 b/sys/src/external/bzip2/bzmore.1
new file mode 100644
index 00000000..98509482
--- /dev/null
+++ b/sys/src/external/bzip2/bzmore.1
@@ -0,0 +1,156 @@
+.\"Shamelessly copied from zmore.1 by Philippe Troin 
+.\"for Debian GNU/Linux
+.TH BZMORE 1
+.SH NAME
+bzmore, bzless \- file perusal filter for crt viewing of bzip2 compressed text
+.SH SYNOPSIS
+.B bzmore
+[ name ...  ]
+.br
+.B bzless
+[ name ...  ]
+.SH NOTE
+In the following description,
+.I bzless
+and
+.I less
+can be used interchangeably with
+.I bzmore
+and
+.I more.
+.SH DESCRIPTION
+.I  Bzmore
+is a filter which allows examination of compressed or plain text files
+one screenful at a time on a soft-copy terminal.
+.I bzmore
+works on files compressed with
+.I bzip2
+and also on uncompressed files.
+If a file does not exist,
+.I bzmore
+looks for a file of the same name with the addition of a .bz2 suffix.
+.PP
+.I Bzmore
+normally pauses after each screenful, printing --More--
+at the bottom of the screen.
+If the user then types a carriage return, one more line is displayed.
+If the user hits a space,
+another screenful is displayed.  Other possibilities are enumerated later.
+.PP
+.I Bzmore
+looks in the file
+.I /etc/termcap
+to determine terminal characteristics,
+and to determine the default window size.
+On a terminal capable of displaying 24 lines,
+the default window size is 22 lines.
+Other sequences which may be typed when
+.I bzmore
+pauses, and their effects, are as follows (\fIi\fP is an optional integer
+argument, defaulting to 1) :
+.PP
+.IP \fIi\|\fP
+display
+.I i
+more lines, (or another screenful if no argument is given)
+.PP
+.IP ^D
+display 11 more lines (a ``scroll'').
+If
+.I i
+is given, then the scroll size is set to \fIi\|\fP.
+.PP
+.IP d
+same as ^D (control-D)
+.PP
+.IP \fIi\|\fPz
+same as typing a space except that \fIi\|\fP, if present, becomes the new
+window size.  Note that the window size reverts back to the default at the
+end of the current file.
+.PP
+.IP \fIi\|\fPs
+skip \fIi\|\fP lines and print a screenful of lines
+.PP
+.IP \fIi\|\fPf
+skip \fIi\fP screenfuls and print a screenful of lines
+.PP
+.IP "q or Q"
+quit reading the current file; go on to the next (if any)
+.PP
+.IP "e or q"
+When the prompt --More--(Next file: 
+.IR file )
+is printed, this command causes bzmore to exit.
+.PP
+.IP s
+When the prompt --More--(Next file: 
+.IR file )
+is printed, this command causes bzmore to skip the next file and continue.
+.PP 
+.IP =
+Display the current line number.
+.PP
+.IP \fIi\|\fP/expr
+search for the \fIi\|\fP-th occurrence of the regular expression \fIexpr.\fP
+If the pattern is not found,
+.I bzmore
+goes on to the next file (if any).
+Otherwise, a screenful is displayed, starting two lines before the place
+where the expression was found.
+The user's erase and kill characters may be used to edit the regular
+expression.
+Erasing back past the first column cancels the search command.
+.PP
+.IP \fIi\|\fPn
+search for the \fIi\|\fP-th occurrence of the last regular expression entered.
+.PP
+.IP !command
+invoke a shell with \fIcommand\|\fP. 
+The character `!' in "command" are replaced with the
+previous shell command.  The sequence "\\!" is replaced by "!".
+.PP
+.IP ":q or :Q"
+quit reading the current file; go on to the next (if any)
+(same as q or Q).
+.PP
+.IP .
+(dot) repeat the previous command.
+.PP
+The commands take effect immediately, i.e., it is not necessary to
+type a carriage return.
+Up to the time when the command character itself is given,
+the user may hit the line kill character to cancel the numerical
+argument being formed.
+In addition, the user may hit the erase character to redisplay the
+--More-- message.
+.PP
+At any time when output is being sent to the terminal, the user can
+hit the quit key (normally control\-\\).
+.I Bzmore
+will stop sending output, and will display the usual --More--
+prompt.
+The user may then enter one of the above commands in the normal manner.
+Unfortunately, some output is lost when this is done, due to the
+fact that any characters waiting in the terminal's output queue
+are flushed when the quit signal occurs.
+.PP
+The terminal is set to
+.I noecho
+mode by this program so that the output can be continuous.
+What you type will thus not show on your terminal, except for the / and !
+commands.
+.PP
+If the standard output is not a teletype, then
+.I bzmore
+acts just like
+.I bzcat,
+except that a header is printed before each file.
+.SH FILES
+.DT
+/etc/termcap		Terminal data base
+.SH "SEE ALSO"
+.BR more (1),
+.BR less (1),
+.BR bzip2 (1),
+.BR bzdiff (1),
+.BR bzgrep (1)
diff --git a/sys/src/external/bzip2/lib/compress.c b/sys/src/external/bzip2/compress.c
similarity index 86%
rename from sys/src/external/bzip2/lib/compress.c
rename to sys/src/external/bzip2/compress.c
index 06251227..2dc5dc12 100644
--- a/sys/src/external/bzip2/lib/compress.c
+++ b/sys/src/external/bzip2/compress.c
@@ -4,74 +4,28 @@
 /*---                                            compress.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * changed setting of nGroups in sendMTFValues() so as to 
-        do a bit better on small files
---*/
-
-#include "os.h"
-#include "bzlib.h"
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+/* CHANGES
+    0.9.0    -- original version.
+    0.9.0a/b -- no changes in this file.
+    0.9.0c   -- changed setting of nGroups in sendMTFValues() 
+                so as to do a bit better on small files
+*/
+
 #include "bzlib_private.h"
 
 
@@ -268,7 +222,7 @@ void generateMTFValues ( EState* s )
          if (zPend < 2) break;
          zPend = (zPend - 2) / 2;
       };
-//rsc: not used      zPend = 0;
+      zPend = 0;
    }
 
    mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;
@@ -365,11 +319,9 @@ void sendMTFValues ( EState* s )
    /*--- 
       Iterate up to BZ_N_ITERS times to improve the tables.
    ---*/
-   nSelectors = 40000;	/* shut up some compilers' warnings about used and not set */
-
    for (iter = 0; iter < BZ_N_ITERS; iter++) {
 
-      for (t = 0; t < nGroups; t++) fave[t] = 0;
+      for (t = 0; t < BZ_N_GROUPS; t++) fave[t] = 0;
 
       for (t = 0; t < nGroups; t++)
          for (v = 0; v < alphaSize; v++)
@@ -401,7 +353,7 @@ void sendMTFValues ( EState* s )
             Calculate the cost of this group as coded
             by each of the coding tables.
          --*/
-         for (t = 0; t < nGroups; t++) cost[t] = 0;
+         for (t = 0; t < BZ_N_GROUPS; t++) cost[t] = 0;
 
          if (nGroups == 6 && 50 == ge-gs+1) {
             /*--- fast track the common case ---*/
@@ -492,15 +444,17 @@ void sendMTFValues ( EState* s )
       /*--
         Recompute the tables based on the accumulated frequencies.
       --*/
+      /* maxLen was changed from 20 to 17 in bzip2-1.0.3.  See 
+         comment in huffman.c for details. */
       for (t = 0; t < nGroups; t++)
          BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]), 
-                                 alphaSize, 20 );
+                                 alphaSize, 17 /*20*/ );
    }
 
 
    AssertH( nGroups < 8, 3002 );
    AssertH( nSelectors < 32768 &&
-            nSelectors <= (2 + (900000 / BZ_G_SIZE)),
+            nSelectors <= BZ_MAX_SELECTORS,
             3003 );
 
 
@@ -531,7 +485,7 @@ void sendMTFValues ( EState* s )
          if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
          if (s->len[t][i] < minLen) minLen = s->len[t][i];
       }
-      AssertH ( !(maxLen > 20), 3004 );
+      AssertH ( !(maxLen > 17 /*20*/ ), 3004 );
       AssertH ( !(minLen < 1),  3005 );
       BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]), 
                           minLen, maxLen, alphaSize );
@@ -655,8 +609,8 @@ void BZ2_compressBlock ( EState* s, Bool is_last_block )
       if (s->blockNo > 1) s->numZ = 0;
 
       if (s->verbosity >= 2)
-         VPrintf4( "    block %d: crc = 0x%8x, "
-                   "combined CRC = 0x%8x, size = %d\n",
+         VPrintf4( "    block %d: crc = 0x%08x, "
+                   "combined CRC = 0x%08x, size = %d\n",
                    s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );
 
       BZ2_blockSort ( s );
@@ -667,10 +621,10 @@ void BZ2_compressBlock ( EState* s, Bool is_last_block )
    /*-- If this is the first block, create the stream header. --*/
    if (s->blockNo == 1) {
       BZ2_bsInitWrite ( s );
-      bsPutUChar ( s, 'B' );
-      bsPutUChar ( s, 'Z' );
-      bsPutUChar ( s, 'h' );
-      bsPutUChar ( s, (UChar)('0' + s->blockSize100k) );
+      bsPutUChar ( s, BZ_HDR_B );
+      bsPutUChar ( s, BZ_HDR_Z );
+      bsPutUChar ( s, BZ_HDR_h );
+      bsPutUChar ( s, (UChar)(BZ_HDR_0 + s->blockSize100k) );
    }
 
    if (s->nblock > 0) {
@@ -707,7 +661,7 @@ void BZ2_compressBlock ( EState* s, Bool is_last_block )
       bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
       bsPutUInt32 ( s, s->combinedCRC );
       if (s->verbosity >= 2)
-         VPrintf1( "    final combined CRC = 0x%x\n   ", s->combinedCRC );
+         VPrintf1( "    final combined CRC = 0x%08x\n   ", s->combinedCRC );
       bsFinishWrite ( s );
    }
 }
diff --git a/sys/src/external/bzip2/lib/crctable.c b/sys/src/external/bzip2/crctable.c
similarity index 66%
rename from sys/src/external/bzip2/lib/crctable.c
rename to sys/src/external/bzip2/crctable.c
index db1eb93f..2b33c253 100644
--- a/sys/src/external/bzip2/lib/crctable.c
+++ b/sys/src/external/bzip2/crctable.c
@@ -4,62 +4,21 @@
 /*---                                            crctable.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
 
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
 
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
 
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
 
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
 
-#include "os.h"
-#include "bzlib.h"
 #include "bzlib_private.h"
 
 /*--
diff --git a/sys/src/external/bzip2/lib/decompress.c b/sys/src/external/bzip2/decompress.c
similarity index 88%
rename from sys/src/external/bzip2/lib/decompress.c
rename to sys/src/external/bzip2/decompress.c
index 734bfee7..a1a0bac8 100644
--- a/sys/src/external/bzip2/lib/decompress.c
+++ b/sys/src/external/bzip2/decompress.c
@@ -4,63 +4,21 @@
 /*---                                          decompress.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-
-#include "os.h"
-#include "bzlib.h"
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
 #include "bzlib_private.h"
 
 
@@ -237,18 +195,18 @@ Int32 BZ2_decompress ( DState* s )
    switch (s->state) {
 
       GET_UCHAR(BZ_X_MAGIC_1, uc);
-      if (uc != 'B') RETURN(BZ_DATA_ERROR_MAGIC);
+      if (uc != BZ_HDR_B) RETURN(BZ_DATA_ERROR_MAGIC);
 
       GET_UCHAR(BZ_X_MAGIC_2, uc);
-      if (uc != 'Z') RETURN(BZ_DATA_ERROR_MAGIC);
+      if (uc != BZ_HDR_Z) RETURN(BZ_DATA_ERROR_MAGIC);
 
       GET_UCHAR(BZ_X_MAGIC_3, uc)
-      if (uc != 'h') RETURN(BZ_DATA_ERROR_MAGIC);
+      if (uc != BZ_HDR_h) RETURN(BZ_DATA_ERROR_MAGIC);
 
       GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8)
-      if (s->blockSize100k < '1' || 
-          s->blockSize100k > '9') RETURN(BZ_DATA_ERROR_MAGIC);
-      s->blockSize100k -= '0';
+      if (s->blockSize100k < (BZ_HDR_0 + 1) || 
+          s->blockSize100k > (BZ_HDR_0 + 9)) RETURN(BZ_DATA_ERROR_MAGIC);
+      s->blockSize100k -= BZ_HDR_0;
 
       if (s->smallDecompress) {
          s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) );
@@ -327,7 +285,7 @@ Int32 BZ2_decompress ( DState* s )
 
       /*--- Now the selectors ---*/
       GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
-      if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
+      if (nGroups < 2 || nGroups > BZ_N_GROUPS) RETURN(BZ_DATA_ERROR);
       GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
       if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
       for (i = 0; i < nSelectors; i++) {
@@ -338,8 +296,14 @@ Int32 BZ2_decompress ( DState* s )
             j++;
             if (j >= nGroups) RETURN(BZ_DATA_ERROR);
          }
-         s->selectorMtf[i] = j;
+         /* Having more than BZ_MAX_SELECTORS doesn't make much sense
+            since they will never be used, but some implementations might
+            "round up" the number of selectors, so just ignore those. */
+         if (i < BZ_MAX_SELECTORS)
+           s->selectorMtf[i] = j;
       }
+      if (nSelectors > BZ_MAX_SELECTORS)
+        nSelectors = BZ_MAX_SELECTORS;
 
       /*--- Undo the MTF values for the selectors. ---*/
       {
@@ -423,6 +387,13 @@ Int32 BZ2_decompress ( DState* s )
             es = -1;
             N = 1;
             do {
+               /* Check that N doesn't get too big, so that es doesn't
+                  go negative.  The maximum value that can be
+                  RUNA/RUNB encoded is equal to the block size (post
+                  the initial RLE), viz, 900k, so bounding N at 2
+                  million should guard against overflow without
+                  rejecting any legitimate inputs. */
+               if (N >= 2*1024*1024) RETURN(BZ_DATA_ERROR);
                if (nextSym == BZ_RUNA) es = es + (0+1) * N; else
                if (nextSym == BZ_RUNB) es = es + (1+1) * N;
                N = N * 2;
@@ -526,17 +497,36 @@ Int32 BZ2_decompress ( DState* s )
       if (s->origPtr < 0 || s->origPtr >= nblock)
          RETURN(BZ_DATA_ERROR);
 
+      /*-- Set up cftab to facilitate generation of T^(-1) --*/
+      /* Check: unzftab entries in range. */
+      for (i = 0; i <= 255; i++) {
+         if (s->unzftab[i] < 0 || s->unzftab[i] > nblock)
+            RETURN(BZ_DATA_ERROR);
+      }
+      /* Actually generate cftab. */
+      s->cftab[0] = 0;
+      for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
+      for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
+      /* Check: cftab entries in range. */
+      for (i = 0; i <= 256; i++) {
+         if (s->cftab[i] < 0 || s->cftab[i] > nblock) {
+            /* s->cftab[i] can legitimately be == nblock */
+            RETURN(BZ_DATA_ERROR);
+         }
+      }
+      /* Check: cftab entries non-descending. */
+      for (i = 1; i <= 256; i++) {
+         if (s->cftab[i-1] > s->cftab[i]) {
+            RETURN(BZ_DATA_ERROR);
+         }
+      }
+
       s->state_out_len = 0;
       s->state_out_ch  = 0;
       BZ_INITIALISE_CRC ( s->calculatedBlockCRC );
       s->state = BZ_X_OUTPUT;
       if (s->verbosity >= 2) VPrintf0 ( "rt+rld" );
 
-      /*-- Set up cftab to facilitate generation of T^(-1) --*/
-      s->cftab[0] = 0;
-      for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
-      for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
-
       if (s->smallDecompress) {
 
          /*-- Make a copy of cftab, used in generation of T --*/
diff --git a/sys/src/external/bzip2/dlltest.c b/sys/src/external/bzip2/dlltest.c
new file mode 100644
index 00000000..03fa1462
--- /dev/null
+++ b/sys/src/external/bzip2/dlltest.c
@@ -0,0 +1,175 @@
+/*
+   minibz2
+      libbz2.dll test program.
+      by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
+      This file is Public Domain.  Welcome any email to me.
+
+   usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]
+*/
+
+#define BZ_IMPORT
+#include 
+#include 
+#include "bzlib.h"
+#ifdef _WIN32
+#include 
+#endif
+
+
+#ifdef _WIN32
+
+#define BZ2_LIBNAME "libbz2-1.0.2.DLL" 
+
+#include 
+static int BZ2DLLLoaded = 0;
+static HINSTANCE BZ2DLLhLib;
+int BZ2DLLLoadLibrary(void)
+{
+   HINSTANCE hLib;
+
+   if(BZ2DLLLoaded==1){return 0;}
+   hLib=LoadLibrary(BZ2_LIBNAME);
+   if(hLib == NULL){
+      fprintf(stderr,"Can't load %s\n",BZ2_LIBNAME);
+      return -1;
+   }
+   BZ2_bzlibVersion=GetProcAddress(hLib,"BZ2_bzlibVersion");
+   BZ2_bzopen=GetProcAddress(hLib,"BZ2_bzopen");
+   BZ2_bzdopen=GetProcAddress(hLib,"BZ2_bzdopen");
+   BZ2_bzread=GetProcAddress(hLib,"BZ2_bzread");
+   BZ2_bzwrite=GetProcAddress(hLib,"BZ2_bzwrite");
+   BZ2_bzflush=GetProcAddress(hLib,"BZ2_bzflush");
+   BZ2_bzclose=GetProcAddress(hLib,"BZ2_bzclose");
+   BZ2_bzerror=GetProcAddress(hLib,"BZ2_bzerror");
+
+   if (!BZ2_bzlibVersion || !BZ2_bzopen || !BZ2_bzdopen
+       || !BZ2_bzread || !BZ2_bzwrite || !BZ2_bzflush
+       || !BZ2_bzclose || !BZ2_bzerror) {
+      fprintf(stderr,"GetProcAddress failed.\n");
+      return -1;
+   }
+   BZ2DLLLoaded=1;
+   BZ2DLLhLib=hLib;
+   return 0;
+
+}
+int BZ2DLLFreeLibrary(void)
+{
+   if(BZ2DLLLoaded==0){return 0;}
+   FreeLibrary(BZ2DLLhLib);
+   BZ2DLLLoaded=0;
+}
+#endif /* WIN32 */
+
+void usage(void)
+{
+   puts("usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]");
+}
+
+int main(int argc,char *argv[])
+{
+   int decompress = 0;
+   int level = 9;
+   char *fn_r = NULL;
+   char *fn_w = NULL;
+
+#ifdef _WIN32
+   if(BZ2DLLLoadLibrary()<0){
+      fprintf(stderr,"Loading of %s failed.  Giving up.\n", BZ2_LIBNAME);
+      exit(1);
+   }
+   printf("Loading of %s succeeded.  Library version is %s.\n",
+          BZ2_LIBNAME, BZ2_bzlibVersion() );
+#endif
+   while(++argv,--argc){
+      if(**argv =='-' || **argv=='/'){
+         char *p;
+
+         for(p=*argv+1;*p;p++){
+            if(*p=='d'){
+               decompress = 1;
+            }else if('1'<=*p && *p<='9'){
+               level = *p - '0';
+            }else{
+               usage();
+               exit(1);
+            }
+         }
+      }else{
+         break;
+      }
+   }
+   if(argc>=1){
+      fn_r = *argv;
+      argc--;argv++;
+   }else{
+      fn_r = NULL;
+   }
+   if(argc>=1){
+      fn_w = *argv;
+      argc--;argv++;
+   }else{
+      fn_w = NULL;
+   }
+   {
+      int len;
+      char buff[0x1000];
+      char mode[10];
+
+      if(decompress){
+         BZFILE *BZ2fp_r = NULL;
+         FILE *fp_w = NULL;
+
+         if(fn_w){
+            if((fp_w = fopen(fn_w,"wb"))==NULL){
+               printf("can't open [%s]\n",fn_w);
+               perror("reason:");
+               exit(1);
+            }
+         }else{
+            fp_w = stdout;
+         }
+         if((fn_r == NULL && (BZ2fp_r = BZ2_bzdopen(fileno(stdin),"rb"))==NULL)
+            || (fn_r != NULL && (BZ2fp_r = BZ2_bzopen(fn_r,"rb"))==NULL)){
+            printf("can't bz2openstream\n");
+            exit(1);
+         }
+         while((len=BZ2_bzread(BZ2fp_r,buff,0x1000))>0){
+            fwrite(buff,1,len,fp_w);
+         }
+         BZ2_bzclose(BZ2fp_r);
+         if(fp_w != stdout) fclose(fp_w);
+      }else{
+         BZFILE *BZ2fp_w = NULL;
+         FILE *fp_r = NULL;
+
+         if(fn_r){
+            if((fp_r = fopen(fn_r,"rb"))==NULL){
+               printf("can't open [%s]\n",fn_r);
+               perror("reason:");
+               exit(1);
+            }
+         }else{
+            fp_r = stdin;
+         }
+         mode[0]='w';
+         mode[1] = '0' + level;
+         mode[2] = '\0';
+
+         if((fn_w == NULL && (BZ2fp_w = BZ2_bzdopen(fileno(stdout),mode))==NULL)
+            || (fn_w !=NULL && (BZ2fp_w = BZ2_bzopen(fn_w,mode))==NULL)){
+            printf("can't bz2openstream\n");
+            exit(1);
+         }
+         while((len=fread(buff,1,0x1000,fp_r))>0){
+            BZ2_bzwrite(BZ2fp_w,buff,len);
+         }
+         BZ2_bzclose(BZ2fp_w);
+         if(fp_r!=stdin)fclose(fp_r);
+      }
+   }
+#ifdef _WIN32
+   BZ2DLLFreeLibrary();
+#endif
+   return 0;
+}
diff --git a/sys/src/external/bzip2/dlltest.dsp b/sys/src/external/bzip2/dlltest.dsp
new file mode 100644
index 00000000..4b1615ed
--- /dev/null
+++ b/sys/src/external/bzip2/dlltest.dsp
@@ -0,0 +1,93 @@
+# Microsoft Developer Studio Project File - Name="dlltest" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 5.00
+# ** •ÒW‚µ‚È‚¢‚Å‚­‚¾‚³‚¢ **
+
+# TARGTYPE "Win32 (x86) Console Application" 0x0103
+
+CFG=dlltest - Win32 Debug
+!MESSAGE ‚±‚ê‚Í—LŒø‚ÈÒ²¸Ì§²Ù‚Å‚Í‚ ‚è‚Ü‚¹‚ñB ‚±‚ÌÌßÛ¼Þª¸Ä‚ðËÞÙÄÞ‚·‚邽‚ß‚É‚Í NMAKE ‚ðŽg—p‚µ‚Ä‚­‚¾‚³‚¢B
+!MESSAGE [Ò²¸Ì§²Ù‚Ì´¸½Îß°Ä] ºÏÝÄÞ‚ðŽg—p‚µ‚ÄŽÀs‚µ‚Ä‚­‚¾‚³‚¢
+!MESSAGE 
+!MESSAGE NMAKE /f "dlltest.mak".
+!MESSAGE 
+!MESSAGE NMAKE ‚ÌŽÀsŽž‚É\¬‚ðŽw’è‚Å‚«‚Ü‚·
+!MESSAGE ºÏÝÄÞ ×²Ýã‚ÅϸۂÌÝ’è‚ð’è‹`‚µ‚Ü‚·B—á:
+!MESSAGE 
+!MESSAGE NMAKE /f "dlltest.mak" CFG="dlltest - Win32 Debug"
+!MESSAGE 
+!MESSAGE ‘I‘ð‰Â”\‚ÈËÞÙÄÞ Ó°ÄÞ:
+!MESSAGE 
+!MESSAGE "dlltest - Win32 Release" ("Win32 (x86) Console Application" —p)
+!MESSAGE "dlltest - Win32 Debug" ("Win32 (x86) Console Application" —p)
+!MESSAGE 
+
+# Begin Project
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "dlltest - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD BASE RSC /l 0x411 /d "NDEBUG"
+# ADD RSC /l 0x411 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386 /out:"minibz2.exe"
+
+!ELSEIF  "$(CFG)" == "dlltest - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "dlltest_"
+# PROP BASE Intermediate_Dir "dlltest_"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dlltest_"
+# PROP Intermediate_Dir "dlltest_"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD BASE RSC /l 0x411 /d "_DEBUG"
+# ADD RSC /l 0x411 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /out:"minibz2.exe" /pdbtype:sept
+
+!ENDIF 
+
+# Begin Target
+
+# Name "dlltest - Win32 Release"
+# Name "dlltest - Win32 Debug"
+# Begin Source File
+
+SOURCE=.\bzlib.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\dlltest.c
+# End Source File
+# End Target
+# End Project
diff --git a/sys/src/external/bzip2/entities.xml b/sys/src/external/bzip2/entities.xml
new file mode 100644
index 00000000..dd699246
--- /dev/null
+++ b/sys/src/external/bzip2/entities.xml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
+
+
diff --git a/sys/src/external/bzip2/format.pl b/sys/src/external/bzip2/format.pl
new file mode 100755
index 00000000..2734dede
--- /dev/null
+++ b/sys/src/external/bzip2/format.pl
@@ -0,0 +1,68 @@
+#!/usr/bin/perl -w
+#
+# ------------------------------------------------------------------
+# This file is part of bzip2/libbzip2, a program and library for
+# lossless, block-sorting data compression.
+#
+# bzip2/libbzip2 version 1.0.8 of 13 July 2019
+# Copyright (C) 1996-2019 Julian Seward 
+#
+# Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+# README file.
+#
+# This program is released under the terms of the license contained
+# in the file LICENSE.
+# ------------------------------------------------------------------
+#
+use strict;
+
+# get command line values:
+if ( $#ARGV !=1 ) {
+    die "Usage:  $0 xml_infile xml_outfile\n";
+}
+
+my $infile = shift;
+# check infile exists
+die "Can't find file \"$infile\""
+  unless -f $infile;
+# check we can read infile
+if (! -r $infile) {
+    die "Can't read input $infile\n";
+}
+# check we can open infile
+open( INFILE,"<$infile" ) or 
+    die "Can't input $infile $!";
+
+#my $outfile = 'fmt-manual.xml';
+my $outfile = shift;
+#print "Infile: $infile, Outfile: $outfile\n";
+# check we can write to outfile
+open( OUTFILE,">$outfile" ) or 
+    die "Can't output $outfile $! for writing";
+
+my ($prev, $curr, $str);
+$prev = ''; $curr = '';
+while (  ) {
+
+		print OUTFILE $prev;
+    $prev = $curr;
+    $curr = $_;
+    $str = '';
+
+    if ( $prev =~ /$|$/ ) {
+        chomp $prev;
+        $curr = join( '', $prev, "|<\/screen>/ ) {
+        chomp $prev;
+        $curr = join( '', $prev, "]]>", $curr );
+				$prev = '';
+        next;
+    }
+}
+print OUTFILE $curr;
+close INFILE;
+close OUTFILE;
+exit;
diff --git a/sys/src/external/bzip2/lib/huffman.c b/sys/src/external/bzip2/huffman.c
similarity index 71%
rename from sys/src/external/bzip2/lib/huffman.c
rename to sys/src/external/bzip2/huffman.c
index 9cad0970..43a1899e 100644
--- a/sys/src/external/bzip2/lib/huffman.c
+++ b/sys/src/external/bzip2/huffman.c
@@ -4,63 +4,21 @@
 /*---                                             huffman.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-
-#include "os.h"
-#include "bzlib.h"
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
 #include "bzlib_private.h"
 
 /*---------------------------------------------------*/
@@ -164,7 +122,24 @@ void BZ2_hbMakeCodeLengths ( UChar *len,
       
       if (! tooLong) break;
 
-      for (i = 1; i < alphaSize; i++) {
+      /* 17 Oct 04: keep-going condition for the following loop used
+         to be 'i < alphaSize', which missed the last element,
+         theoretically leading to the possibility of the compressor
+         looping.  However, this count-scaling step is only needed if
+         one of the generated Huffman code words is longer than
+         maxLen, which up to and including version 1.0.2 was 20 bits,
+         which is extremely unlikely.  In version 1.0.3 maxLen was
+         changed to 17 bits, which has minimal effect on compression
+         ratio, but does mean this scaling step is used from time to
+         time, enough to verify that it works.
+
+         This means that bzip2-1.0.3 and later will only produce
+         Huffman codes with a maximum length of 17 bits.  However, in
+         order to preserve backwards compatibility with bitstreams
+         produced by versions pre-1.0.3, the decompressor must still
+         handle lengths of up to 20. */
+
+      for (i = 1; i <= alphaSize; i++) {
          j = weight[i] >> 8;
          j = 1 + (j / 2);
          weight[i] = j << 8;
diff --git a/sys/src/external/bzip2/lib/buffcompress.c b/sys/src/external/bzip2/lib/buffcompress.c
deleted file mode 100644
index 849c8ff0..00000000
--- a/sys/src/external/bzip2/lib/buffcompress.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzBuffToBuffCompress) 
-                         ( char*         dest, 
-                           unsigned int* destLen,
-                           char*         source, 
-                           unsigned int  sourceLen,
-                           int           blockSize100k, 
-                           int           verbosity, 
-                           int           workFactor )
-{
-   bz_stream strm;
-   int ret;
-
-   if (dest == NULL || destLen == NULL || 
-       source == NULL ||
-       blockSize100k < 1 || blockSize100k > 9 ||
-       verbosity < 0 || verbosity > 4 ||
-       workFactor < 0 || workFactor > 250) 
-      return BZ_PARAM_ERROR;
-
-   if (workFactor == 0) workFactor = 30;
-   strm.bzalloc = NULL;
-   strm.bzfree = NULL;
-   strm.opaque = NULL;
-   ret = BZ2_bzCompressInit ( &strm, blockSize100k, 
-                              verbosity, workFactor );
-   if (ret != BZ_OK) return ret;
-
-   strm.next_in = source;
-   strm.next_out = dest;
-   strm.avail_in = sourceLen;
-   strm.avail_out = *destLen;
-
-   ret = BZ2_bzCompress ( &strm, BZ_FINISH );
-   if (ret == BZ_FINISH_OK) goto output_overflow;
-   if (ret != BZ_STREAM_END) goto errhandler;
-
-   /* normal termination */
-   *destLen -= strm.avail_out;   
-   BZ2_bzCompressEnd ( &strm );
-   return BZ_OK;
-
-   output_overflow:
-   BZ2_bzCompressEnd ( &strm );
-   return BZ_OUTBUFF_FULL;
-
-   errhandler:
-   BZ2_bzCompressEnd ( &strm );
-   return ret;
-}
-
diff --git a/sys/src/external/bzip2/lib/buffdecompress.c b/sys/src/external/bzip2/lib/buffdecompress.c
deleted file mode 100644
index 944166f3..00000000
--- a/sys/src/external/bzip2/lib/buffdecompress.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzBuffToBuffDecompress) 
-                           ( char*         dest, 
-                             unsigned int* destLen,
-                             char*         source, 
-                             unsigned int  sourceLen,
-                             int           small,
-                             int           verbosity )
-{
-   bz_stream strm;
-   int ret;
-
-   if (dest == NULL || destLen == NULL || 
-       source == NULL ||
-       (small != 0 && small != 1) ||
-       verbosity < 0 || verbosity > 4) 
-          return BZ_PARAM_ERROR;
-
-   strm.bzalloc = NULL;
-   strm.bzfree = NULL;
-   strm.opaque = NULL;
-   ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
-   if (ret != BZ_OK) return ret;
-
-   strm.next_in = source;
-   strm.next_out = dest;
-   strm.avail_in = sourceLen;
-   strm.avail_out = *destLen;
-
-   ret = BZ2_bzDecompress ( &strm );
-   if (ret == BZ_OK) goto output_overflow_or_eof;
-   if (ret != BZ_STREAM_END) goto errhandler;
-
-   /* normal termination */
-   *destLen -= strm.avail_out;
-   BZ2_bzDecompressEnd ( &strm );
-   return BZ_OK;
-
-   output_overflow_or_eof:
-   if (strm.avail_out > 0) {
-      BZ2_bzDecompressEnd ( &strm );
-      return BZ_UNEXPECTED_EOF;
-   } else {
-      BZ2_bzDecompressEnd ( &strm );
-      return BZ_OUTBUFF_FULL;
-   };      
-
-   errhandler:
-   BZ2_bzDecompressEnd ( &strm );
-   return ret; 
-}
-
-
diff --git a/sys/src/external/bzip2/lib/bzassert.c b/sys/src/external/bzip2/lib/bzassert.c
deleted file mode 100644
index 56d58fc2..00000000
--- a/sys/src/external/bzip2/lib/bzassert.c
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-#include "bzlib_stdio.h"
-#include "bzlib_stdio_private.h"
-
-
-void BZ2_bz__AssertH__fail ( int errcode )
-{
-   fprintf(stderr, 
-      "\n\nbzip2/libbzip2: internal error number %d.\n"
-      "This is a bug in bzip2/libbzip2, %s.\n"
-      "Please report it to me at: jseward@acm.org.  If this happened\n"
-      "when you were using some program which uses libbzip2 as a\n"
-      "component, you should also report this bug to the author(s)\n"
-      "of that program.  Please make an effort to report this bug;\n"
-      "timely and accurate bug reports eventually lead to higher\n"
-      "quality software.  Thanks.  Julian Seward, 21 March 2000.\n\n",
-      errcode,
-      BZ2_bzlibVersion()
-   );
-   exit(3);
-}
diff --git a/sys/src/external/bzip2/lib/bzbuffcompress.c b/sys/src/external/bzip2/lib/bzbuffcompress.c
deleted file mode 100644
index 849c8ff0..00000000
--- a/sys/src/external/bzip2/lib/bzbuffcompress.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzBuffToBuffCompress) 
-                         ( char*         dest, 
-                           unsigned int* destLen,
-                           char*         source, 
-                           unsigned int  sourceLen,
-                           int           blockSize100k, 
-                           int           verbosity, 
-                           int           workFactor )
-{
-   bz_stream strm;
-   int ret;
-
-   if (dest == NULL || destLen == NULL || 
-       source == NULL ||
-       blockSize100k < 1 || blockSize100k > 9 ||
-       verbosity < 0 || verbosity > 4 ||
-       workFactor < 0 || workFactor > 250) 
-      return BZ_PARAM_ERROR;
-
-   if (workFactor == 0) workFactor = 30;
-   strm.bzalloc = NULL;
-   strm.bzfree = NULL;
-   strm.opaque = NULL;
-   ret = BZ2_bzCompressInit ( &strm, blockSize100k, 
-                              verbosity, workFactor );
-   if (ret != BZ_OK) return ret;
-
-   strm.next_in = source;
-   strm.next_out = dest;
-   strm.avail_in = sourceLen;
-   strm.avail_out = *destLen;
-
-   ret = BZ2_bzCompress ( &strm, BZ_FINISH );
-   if (ret == BZ_FINISH_OK) goto output_overflow;
-   if (ret != BZ_STREAM_END) goto errhandler;
-
-   /* normal termination */
-   *destLen -= strm.avail_out;   
-   BZ2_bzCompressEnd ( &strm );
-   return BZ_OK;
-
-   output_overflow:
-   BZ2_bzCompressEnd ( &strm );
-   return BZ_OUTBUFF_FULL;
-
-   errhandler:
-   BZ2_bzCompressEnd ( &strm );
-   return ret;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzcompress.c b/sys/src/external/bzip2/lib/bzcompress.c
deleted file mode 100644
index c9369e62..00000000
--- a/sys/src/external/bzip2/lib/bzcompress.c
+++ /dev/null
@@ -1,465 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-/*--- Compression stuff                           ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-static
-void prepare_new_block ( EState* s )
-{
-   Int32 i;
-   s->nblock = 0;
-   s->numZ = 0;
-   s->state_out_pos = 0;
-   BZ_INITIALISE_CRC ( s->blockCRC );
-   for (i = 0; i < 256; i++) s->inUse[i] = False;
-   s->blockNo++;
-}
-
-
-/*---------------------------------------------------*/
-static
-void init_RL ( EState* s )
-{
-   s->state_in_ch  = 256;
-   s->state_in_len = 0;
-}
-
-
-static
-Bool isempty_RL ( EState* s )
-{
-   if (s->state_in_ch < 256 && s->state_in_len > 0)
-      return False; else
-      return True;
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompressInit) 
-                    ( bz_stream* strm, 
-                     int        blockSize100k,
-                     int        verbosity,
-                     int        workFactor )
-{
-   Int32   n;
-   EState* s;
-
-   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
-
-   if (strm == NULL || 
-       blockSize100k < 1 || blockSize100k > 9 ||
-       workFactor < 0 || workFactor > 250)
-     return BZ_PARAM_ERROR;
-
-   if (workFactor == 0) workFactor = 30;
-   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
-   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
-
-   s = BZALLOC( sizeof(EState) );
-   if (s == NULL) return BZ_MEM_ERROR;
-   s->strm = strm;
-
-   s->arr1 = NULL;
-   s->arr2 = NULL;
-   s->ftab = NULL;
-
-   n       = 100000 * blockSize100k;
-   s->arr1 = BZALLOC( n                  * sizeof(UInt32) );
-   s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
-   s->ftab = BZALLOC( 65537              * sizeof(UInt32) );
-
-   if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
-      if (s->arr1 != NULL) BZFREE(s->arr1);
-      if (s->arr2 != NULL) BZFREE(s->arr2);
-      if (s->ftab != NULL) BZFREE(s->ftab);
-      if (s       != NULL) BZFREE(s);
-      return BZ_MEM_ERROR;
-   }
-
-   s->blockNo           = 0;
-   s->state             = BZ_S_INPUT;
-   s->mode              = BZ_M_RUNNING;
-   s->combinedCRC       = 0;
-   s->blockSize100k     = blockSize100k;
-   s->nblockMAX         = 100000 * blockSize100k - 19;
-   s->verbosity         = verbosity;
-   s->workFactor        = workFactor;
-
-   s->block             = (UChar*)s->arr2;
-   s->mtfv              = (UInt16*)s->arr1;
-   s->zbits             = NULL;
-   s->ptr               = (UInt32*)s->arr1;
-
-   strm->state          = s;
-   strm->total_in_lo32  = 0;
-   strm->total_in_hi32  = 0;
-   strm->total_out_lo32 = 0;
-   strm->total_out_hi32 = 0;
-   init_RL ( s );
-   prepare_new_block ( s );
-   return BZ_OK;
-}
-
-
-/*---------------------------------------------------*/
-static
-void add_pair_to_block ( EState* s )
-{
-   Int32 i;
-   UChar ch = (UChar)(s->state_in_ch);
-   for (i = 0; i < s->state_in_len; i++) {
-      BZ_UPDATE_CRC( s->blockCRC, ch );
-   }
-   s->inUse[s->state_in_ch] = True;
-   switch (s->state_in_len) {
-      case 1:
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         break;
-      case 2:
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         break;
-      case 3:
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         break;
-      default:
-         s->inUse[s->state_in_len-4] = True;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = (UChar)ch; s->nblock++;
-         s->block[s->nblock] = ((UChar)(s->state_in_len-4));
-         s->nblock++;
-         break;
-   }
-}
-
-
-/*---------------------------------------------------*/
-static
-void flush_RL ( EState* s )
-{
-   if (s->state_in_ch < 256) add_pair_to_block ( s );
-   init_RL ( s );
-}
-
-
-/*---------------------------------------------------*/
-#define ADD_CHAR_TO_BLOCK(zs,zchh0)               \
-{                                                 \
-   UInt32 zchh = (UInt32)(zchh0);                 \
-   /*-- fast track the common case --*/           \
-   if (zchh != zs->state_in_ch &&                 \
-       zs->state_in_len == 1) {                   \
-      UChar ch = (UChar)(zs->state_in_ch);        \
-      BZ_UPDATE_CRC( zs->blockCRC, ch );          \
-      zs->inUse[zs->state_in_ch] = True;          \
-      zs->block[zs->nblock] = (UChar)ch;          \
-      zs->nblock++;                               \
-      zs->state_in_ch = zchh;                     \
-   }                                              \
-   else                                           \
-   /*-- general, uncommon cases --*/              \
-   if (zchh != zs->state_in_ch ||                 \
-      zs->state_in_len == 255) {                  \
-      if (zs->state_in_ch < 256)                  \
-         add_pair_to_block ( zs );                \
-      zs->state_in_ch = zchh;                     \
-      zs->state_in_len = 1;                       \
-   } else {                                       \
-      zs->state_in_len++;                         \
-   }                                              \
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool copy_input_until_stop ( EState* s )
-{
-   Bool progress_in = False;
-
-   if (s->mode == BZ_M_RUNNING) {
-
-      /*-- fast track the common case --*/
-      while (True) {
-         /*-- block full? --*/
-         if (s->nblock >= s->nblockMAX) break;
-         /*-- no input? --*/
-         if (s->strm->avail_in == 0) break;
-         progress_in = True;
-         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
-         s->strm->next_in++;
-         s->strm->avail_in--;
-         s->strm->total_in_lo32++;
-         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
-      }
-
-   } else {
-
-      /*-- general, uncommon case --*/
-      while (True) {
-         /*-- block full? --*/
-         if (s->nblock >= s->nblockMAX) break;
-         /*-- no input? --*/
-         if (s->strm->avail_in == 0) break;
-         /*-- flush/finish end? --*/
-         if (s->avail_in_expect == 0) break;
-         progress_in = True;
-         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
-         s->strm->next_in++;
-         s->strm->avail_in--;
-         s->strm->total_in_lo32++;
-         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
-         s->avail_in_expect--;
-      }
-   }
-   return progress_in;
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool copy_output_until_stop ( EState* s )
-{
-   Bool progress_out = False;
-
-   while (True) {
-
-      /*-- no output space? --*/
-      if (s->strm->avail_out == 0) break;
-
-      /*-- block done? --*/
-      if (s->state_out_pos >= s->numZ) break;
-
-      progress_out = True;
-      *(s->strm->next_out) = s->zbits[s->state_out_pos];
-      s->state_out_pos++;
-      s->strm->avail_out--;
-      s->strm->next_out++;
-      s->strm->total_out_lo32++;
-      if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
-   }
-
-   return progress_out;
-}
-
-
-/*---------------------------------------------------*/
-static
-Bool handle_compress ( bz_stream* strm )
-{
-   Bool progress_in  = False;
-   Bool progress_out = False;
-   EState* s = strm->state;
-   
-   while (True) {
-
-      if (s->state == BZ_S_OUTPUT) {
-         progress_out |= copy_output_until_stop ( s );
-         if (s->state_out_pos < s->numZ) break;
-         if (s->mode == BZ_M_FINISHING && 
-             s->avail_in_expect == 0 &&
-             isempty_RL(s)) break;
-         prepare_new_block ( s );
-         s->state = BZ_S_INPUT;
-         if (s->mode == BZ_M_FLUSHING && 
-             s->avail_in_expect == 0 &&
-             isempty_RL(s)) break;
-      }
-
-      if (s->state == BZ_S_INPUT) {
-         progress_in |= copy_input_until_stop ( s );
-         if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
-            flush_RL ( s );
-            BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
-            s->state = BZ_S_OUTPUT;
-         }
-         else
-         if (s->nblock >= s->nblockMAX) {
-            BZ2_compressBlock ( s, False );
-            s->state = BZ_S_OUTPUT;
-         }
-         else
-         if (s->strm->avail_in == 0) {
-            break;
-         }
-      }
-
-   }
-
-   return progress_in || progress_out;
-}
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
-{
-   Bool progress;
-   EState* s;
-   if (strm == NULL) return BZ_PARAM_ERROR;
-   s = strm->state;
-   if (s == NULL) return BZ_PARAM_ERROR;
-   if (s->strm != strm) return BZ_PARAM_ERROR;
-
-   preswitch:
-   switch (s->mode) {
-
-      case BZ_M_IDLE:
-         return BZ_SEQUENCE_ERROR;
-
-      case BZ_M_RUNNING:
-         if (action == BZ_RUN) {
-            progress = handle_compress ( strm );
-            return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
-         } 
-         else
-	 if (action == BZ_FLUSH) {
-            s->avail_in_expect = strm->avail_in;
-            s->mode = BZ_M_FLUSHING;
-            goto preswitch;
-         }
-         else
-         if (action == BZ_FINISH) {
-            s->avail_in_expect = strm->avail_in;
-            s->mode = BZ_M_FINISHING;
-            goto preswitch;
-         }
-         else 
-            return BZ_PARAM_ERROR;
-
-      case BZ_M_FLUSHING:
-         if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
-         if (s->avail_in_expect != s->strm->avail_in) 
-            return BZ_SEQUENCE_ERROR;
-         progress = handle_compress ( strm );
-         if (!progress) return BZ_SEQUENCE_ERROR;	//rsc added
-         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
-             s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
-         s->mode = BZ_M_RUNNING;
-         return BZ_RUN_OK;
-
-      case BZ_M_FINISHING:
-         if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
-         if (s->avail_in_expect != s->strm->avail_in) 
-            return BZ_SEQUENCE_ERROR;
-         progress = handle_compress ( strm );
-         if (!progress) return BZ_SEQUENCE_ERROR;
-         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
-             s->state_out_pos < s->numZ) return BZ_FINISH_OK;
-         s->mode = BZ_M_IDLE;
-         return BZ_STREAM_END;
-   }
-   return BZ_OK; /*--not reached--*/
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzCompressEnd)  ( bz_stream *strm )
-{
-   EState* s;
-   if (strm == NULL) return BZ_PARAM_ERROR;
-   s = strm->state;
-   if (s == NULL) return BZ_PARAM_ERROR;
-   if (s->strm != strm) return BZ_PARAM_ERROR;
-
-   if (s->arr1 != NULL) BZFREE(s->arr1);
-   if (s->arr2 != NULL) BZFREE(s->arr2);
-   if (s->ftab != NULL) BZFREE(s->ftab);
-   BZFREE(strm->state);
-
-   strm->state = NULL;   
-
-   return BZ_OK;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzdecompress.c b/sys/src/external/bzip2/lib/bzdecompress.c
deleted file mode 100644
index da9ce566..00000000
--- a/sys/src/external/bzip2/lib/bzdecompress.c
+++ /dev/null
@@ -1,455 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-/*--- Decompression stuff                         ---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompressInit) 
-                     ( bz_stream* strm, 
-                       int        verbosity,
-                       int        small )
-{
-   DState* s;
-
-   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
-
-   if (strm == NULL) return BZ_PARAM_ERROR;
-   if (small != 0 && small != 1) return BZ_PARAM_ERROR;
-   if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
-
-   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
-   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
-
-   s = BZALLOC( sizeof(DState) );
-   if (s == NULL) return BZ_MEM_ERROR;
-   s->strm                  = strm;
-   strm->state              = s;
-   s->state                 = BZ_X_MAGIC_1;
-   s->bsLive                = 0;
-   s->bsBuff                = 0;
-   s->calculatedCombinedCRC = 0;
-   strm->total_in_lo32      = 0;
-   strm->total_in_hi32      = 0;
-   strm->total_out_lo32     = 0;
-   strm->total_out_hi32     = 0;
-   s->smallDecompress       = (Bool)small;
-   s->ll4                   = NULL;
-   s->ll16                  = NULL;
-   s->tt                    = NULL;
-   s->currBlockNo           = 0;
-   s->verbosity             = verbosity;
-
-   return BZ_OK;
-}
-
-
-/*---------------------------------------------------*/
-static
-void unRLE_obuf_to_output_FAST ( DState* s )
-{
-   UChar k1;
-
-   if (s->blockRandomised) {
-
-      while (True) {
-         /* try to finish existing run */
-         while (True) {
-            if (s->strm->avail_out == 0) return;
-            if (s->state_out_len == 0) break;
-            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
-            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
-            s->state_out_len--;
-            s->strm->next_out++;
-            s->strm->avail_out--;
-            s->strm->total_out_lo32++;
-            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
-         }
-   
-         /* can a new run be started? */
-         if (s->nblock_used == s->save_nblock+1) return;
-               
-   
-         s->state_out_len = 1;
-         s->state_out_ch = s->k0;
-         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 2;
-         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 3;
-         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         s->state_out_len = ((Int32)k1) + 4;
-         BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK; 
-         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
-      }
-
-   } else {
-
-      /* restore */
-      UInt32        c_calculatedBlockCRC = s->calculatedBlockCRC;
-      UChar         c_state_out_ch       = s->state_out_ch;
-      Int32         c_state_out_len      = s->state_out_len;
-      Int32         c_nblock_used        = s->nblock_used;
-      Int32         c_k0                 = s->k0;
-      UInt32*       c_tt                 = s->tt;
-      UInt32        c_tPos               = s->tPos;
-      char*         cs_next_out          = s->strm->next_out;
-      unsigned int  cs_avail_out         = s->strm->avail_out;
-      /* end restore */
-
-      UInt32       avail_out_INIT = cs_avail_out;
-      Int32        s_save_nblockPP = s->save_nblock+1;
-      unsigned int total_out_lo32_old;
-
-      while (True) {
-
-         /* try to finish existing run */
-         if (c_state_out_len > 0) {
-            while (True) {
-               if (cs_avail_out == 0) goto return_notr;
-               if (c_state_out_len == 1) break;
-               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
-               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
-               c_state_out_len--;
-               cs_next_out++;
-               cs_avail_out--;
-            }
-            s_state_out_len_eq_one:
-            {
-               if (cs_avail_out == 0) { 
-                  c_state_out_len = 1; goto return_notr;
-               };
-               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
-               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
-               cs_next_out++;
-               cs_avail_out--;
-            }
-         }   
-         /* can a new run be started? */
-         if (c_nblock_used == s_save_nblockPP) {
-            c_state_out_len = 0; goto return_notr;
-         };   
-         c_state_out_ch = c_k0;
-         BZ_GET_FAST_C(k1); c_nblock_used++;
-         if (k1 != c_k0) { 
-            c_k0 = k1; goto s_state_out_len_eq_one; 
-         };
-         if (c_nblock_used == s_save_nblockPP) 
-            goto s_state_out_len_eq_one;
-   
-         c_state_out_len = 2;
-         BZ_GET_FAST_C(k1); c_nblock_used++;
-         if (c_nblock_used == s_save_nblockPP) continue;
-         if (k1 != c_k0) { c_k0 = k1; continue; };
-   
-         c_state_out_len = 3;
-         BZ_GET_FAST_C(k1); c_nblock_used++;
-         if (c_nblock_used == s_save_nblockPP) continue;
-         if (k1 != c_k0) { c_k0 = k1; continue; };
-   
-         BZ_GET_FAST_C(k1); c_nblock_used++;
-         c_state_out_len = ((Int32)k1) + 4;
-         BZ_GET_FAST_C(c_k0); c_nblock_used++;
-      }
-
-      return_notr:
-      total_out_lo32_old = s->strm->total_out_lo32;
-      s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
-      if (s->strm->total_out_lo32 < total_out_lo32_old)
-         s->strm->total_out_hi32++;
-
-      /* save */
-      s->calculatedBlockCRC = c_calculatedBlockCRC;
-      s->state_out_ch       = c_state_out_ch;
-      s->state_out_len      = c_state_out_len;
-      s->nblock_used        = c_nblock_used;
-      s->k0                 = c_k0;
-      s->tt                 = c_tt;
-      s->tPos               = c_tPos;
-      s->strm->next_out     = cs_next_out;
-      s->strm->avail_out    = cs_avail_out;
-      /* end save */
-   }
-}
-
-
-
-/*---------------------------------------------------*/
-__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
-{
-   Int32 nb, na, mid;
-   nb = 0;
-   na = 256;
-   do {
-      mid = (nb + na) >> 1;
-      if (indx >= cftab[mid]) nb = mid; else na = mid;
-   }
-   while (na - nb != 1);
-   return nb;
-}
-
-
-/*---------------------------------------------------*/
-static
-void unRLE_obuf_to_output_SMALL ( DState* s )
-{
-   UChar k1;
-
-   if (s->blockRandomised) {
-
-      while (True) {
-         /* try to finish existing run */
-         while (True) {
-            if (s->strm->avail_out == 0) return;
-            if (s->state_out_len == 0) break;
-            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
-            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
-            s->state_out_len--;
-            s->strm->next_out++;
-            s->strm->avail_out--;
-            s->strm->total_out_lo32++;
-            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
-         }
-   
-         /* can a new run be started? */
-         if (s->nblock_used == s->save_nblock+1) return;
-               
-   
-         s->state_out_len = 1;
-         s->state_out_ch = s->k0;
-         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 2;
-         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 3;
-         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
-         k1 ^= BZ_RAND_MASK; s->nblock_used++;
-         s->state_out_len = ((Int32)k1) + 4;
-         BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK; 
-         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
-      }
-
-   } else {
-
-      while (True) {
-         /* try to finish existing run */
-         while (True) {
-            if (s->strm->avail_out == 0) return;
-            if (s->state_out_len == 0) break;
-            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
-            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
-            s->state_out_len--;
-            s->strm->next_out++;
-            s->strm->avail_out--;
-            s->strm->total_out_lo32++;
-            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
-         }
-   
-         /* can a new run be started? */
-         if (s->nblock_used == s->save_nblock+1) return;
-   
-         s->state_out_len = 1;
-         s->state_out_ch = s->k0;
-         BZ_GET_SMALL(k1); s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 2;
-         BZ_GET_SMALL(k1); s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         s->state_out_len = 3;
-         BZ_GET_SMALL(k1); s->nblock_used++;
-         if (s->nblock_used == s->save_nblock+1) continue;
-         if (k1 != s->k0) { s->k0 = k1; continue; };
-   
-         BZ_GET_SMALL(k1); s->nblock_used++;
-         s->state_out_len = ((Int32)k1) + 4;
-         BZ_GET_SMALL(s->k0); s->nblock_used++;
-      }
-
-   }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
-{
-   DState* s;
-   if (strm == NULL) return BZ_PARAM_ERROR;
-   s = strm->state;
-   if (s == NULL) return BZ_PARAM_ERROR;
-   if (s->strm != strm) return BZ_PARAM_ERROR;
-
-   while (True) {
-      if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
-      if (s->state == BZ_X_OUTPUT) {
-         if (s->smallDecompress)
-            unRLE_obuf_to_output_SMALL ( s ); else
-            unRLE_obuf_to_output_FAST  ( s );
-         if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
-            BZ_FINALISE_CRC ( s->calculatedBlockCRC );
-            if (s->verbosity >= 3) 
-               VPrintf2 ( " {0x%x, 0x%x}", s->storedBlockCRC, 
-                          s->calculatedBlockCRC );
-            if (s->verbosity >= 2) VPrintf0 ( "]" );
-            if (s->calculatedBlockCRC != s->storedBlockCRC)
-               return BZ_DATA_ERROR;
-            s->calculatedCombinedCRC 
-               = (s->calculatedCombinedCRC << 1) | 
-                    (s->calculatedCombinedCRC >> 31);
-            s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
-            s->state = BZ_X_BLKHDR_1;
-         } else {
-            return BZ_OK;
-         }
-      }
-      if (s->state >= BZ_X_MAGIC_1) {
-         Int32 r = BZ2_decompress ( s );
-         if (r == BZ_STREAM_END) {
-            if (s->verbosity >= 3)
-               VPrintf2 ( "\n    combined CRCs: stored = 0x%x, computed = 0x%x", 
-                          s->storedCombinedCRC, s->calculatedCombinedCRC );
-            if (s->calculatedCombinedCRC != s->storedCombinedCRC)
-               return BZ_DATA_ERROR;
-            return r;
-         }
-         if (s->state != BZ_X_OUTPUT) return r;
-      }
-   }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzDecompressEnd)  ( bz_stream *strm )
-{
-   DState* s;
-   if (strm == NULL) return BZ_PARAM_ERROR;
-   s = strm->state;
-   if (s == NULL) return BZ_PARAM_ERROR;
-   if (s->strm != strm) return BZ_PARAM_ERROR;
-
-   if (s->tt   != NULL) BZFREE(s->tt);
-   if (s->ll16 != NULL) BZFREE(s->ll16);
-   if (s->ll4  != NULL) BZFREE(s->ll4);
-
-   BZFREE(strm->state);
-   strm->state = NULL;
-
-   return BZ_OK;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzfeof.c b/sys/src/external/bzip2/lib/bzfeof.c
deleted file mode 100644
index 74e1f88d..00000000
--- a/sys/src/external/bzip2/lib/bzfeof.c
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-#include "bzlib_stdio.h"
-#include "bzlib_stdio_private.h"
-
-Bool bz_feof ( FILE* f )
-{
-   Int32 c = fgetc ( f );
-   if (c == EOF) return True;
-   ungetc ( c, f );
-   return False;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzlib.c b/sys/src/external/bzip2/lib/bzlib.c
deleted file mode 100644
index 66b89a2e..00000000
--- a/sys/src/external/bzip2/lib/bzlib.c
+++ /dev/null
@@ -1,116 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-int bz_config_ok ( void )
-{
-   if (sizeof(int)   != 4) return 0;
-   if (sizeof(short) != 2) return 0;
-   if (sizeof(char)  != 1) return 0;
-   return 1;
-}
-
-/*---------------------------------------------------*/
-void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
-{
-   void* v = malloc ( items * size );
-   return v;
-}
-
-void default_bzfree ( void* opaque, void* addr )
-{
-   if (addr != NULL) free ( addr );
-}
-
-/* rsc added this: where did the original go? */
-void bz_internal_error( int errcode )
-{
-   exit(1);
-}
diff --git a/sys/src/external/bzip2/lib/bzlib_stdio.h b/sys/src/external/bzip2/lib/bzlib_stdio.h
deleted file mode 100644
index 30d41d99..00000000
--- a/sys/src/external/bzip2/lib/bzlib_stdio.h
+++ /dev/null
@@ -1,190 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include 
-
-#define BZ_MAX_UNUSED 5000
-
-typedef void BZFILE;
-
-BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) (
-      const char *path,
-      const char *mode
-   );
-
-BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) (
-      int        fd,
-      const char *mode
-   );
-         
-BZ_EXTERN int BZ_API(BZ2_bzread) (
-      BZFILE* b, 
-      void* buf, 
-      int len 
-   );
-
-BZ_EXTERN int BZ_API(BZ2_bzwrite) (
-      BZFILE* b, 
-      void*   buf, 
-      int     len 
-   );
-
-BZ_EXTERN int BZ_API(BZ2_bzflush) (
-      BZFILE* b
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzclose) (
-      BZFILE* b
-   );
-
-BZ_EXTERN const char * BZ_API(BZ2_bzerror) (
-      BZFILE *b, 
-      int    *errnum
-   );
-
-
-/*-- High(er) level library functions --*/
-BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( 
-      int*  bzerror,   
-      FILE* f, 
-      int   verbosity, 
-      int   small,
-      void* unused,    
-      int   nUnused 
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( 
-      int*    bzerror, 
-      BZFILE* b 
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( 
-      int*    bzerror, 
-      BZFILE* b, 
-      void**  unused,  
-      int*    nUnused 
-   );
-
-BZ_EXTERN int BZ_API(BZ2_bzRead) ( 
-      int*    bzerror, 
-      BZFILE* b, 
-      void*   buf, 
-      int     len 
-   );
-
-BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( 
-      int*  bzerror,      
-      FILE* f, 
-      int   blockSize100k, 
-      int   verbosity, 
-      int   workFactor 
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzWrite) ( 
-      int*    bzerror, 
-      BZFILE* b, 
-      void*   buf, 
-      int     len 
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( 
-      int*          bzerror, 
-      BZFILE*       b, 
-      int           abandon, 
-      unsigned int* nbytes_in, 
-      unsigned int* nbytes_out 
-   );
-
-BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( 
-      int*          bzerror, 
-      BZFILE*       b, 
-      int           abandon, 
-      unsigned int* nbytes_in_lo32, 
-      unsigned int* nbytes_in_hi32, 
-      unsigned int* nbytes_out_lo32, 
-      unsigned int* nbytes_out_hi32
-   );
-
diff --git a/sys/src/external/bzip2/lib/bzlib_stdio_private.h b/sys/src/external/bzip2/lib/bzlib_stdio_private.h
deleted file mode 100644
index 24b31144..00000000
--- a/sys/src/external/bzip2/lib/bzlib_stdio_private.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-extern void BZ2_bz__AssertH__fail ( int errcode );
-
-/* undo definitions in bzlib_private.h */
-#undef AssertH
-#undef AssertD
-#undef VPrintf0
-#undef VPrintf1
-#undef VPrintf2
-#undef VPrintf3
-#undef VPrintf4
-#undef VPrintf5
-
-#define AssertH(cond,errcode) \
-   { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
-#if BZ_DEBUG
-#define AssertD(cond,msg) \
-   { if (!(cond)) {       \
-      fprintf ( stderr,   \
-        "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
-      exit(1); \
-   }}
-#else
-#define AssertD(cond,msg) /* */
-#endif
-#define VPrintf0(zf) \
-   fprintf(stderr,zf)
-#define VPrintf1(zf,za1) \
-   fprintf(stderr,zf,za1)
-#define VPrintf2(zf,za1,za2) \
-   fprintf(stderr,zf,za1,za2)
-#define VPrintf3(zf,za1,za2,za3) \
-   fprintf(stderr,zf,za1,za2,za3)
-#define VPrintf4(zf,za1,za2,za3,za4) \
-   fprintf(stderr,zf,za1,za2,za3,za4)
-#define VPrintf5(zf,za1,za2,za3,za4,za5) \
-   fprintf(stderr,zf,za1,za2,za3,za4,za5)
-
-#define BZ_SETERR(eee)                    \
-{                                         \
-   if (bzerror != NULL) *bzerror = eee;   \
-   if (bzf != NULL) bzf->lastErr = eee;   \
-}
-
-typedef 
-   struct {
-      FILE*     handle;
-      Char      buf[BZ_MAX_UNUSED];
-      Int32     bufN;
-      Bool      writing;
-      bz_stream strm;
-      Int32     lastErr;
-      Bool      initialisedOk;
-   }
-   bzFile;
-
-extern Bool bz_feof( FILE* );
-
diff --git a/sys/src/external/bzip2/lib/bzread.c b/sys/src/external/bzip2/lib/bzread.c
deleted file mode 100644
index e07b6451..00000000
--- a/sys/src/external/bzip2/lib/bzread.c
+++ /dev/null
@@ -1,235 +0,0 @@
-/* THIS FILE HAS BEEN MODIFIED -- rsc split bzlib.c into bzlib.c,
-		bzlibcompress.c, bzlibdecompress.c, bzlibread.c, bzlibwrite.c
- */
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-#include "bzlib_stdio.h"
-#include "bzlib_stdio_private.h"
-
-/*---------------------------------------------------*/
-BZFILE* BZ_API(BZ2_bzReadOpen) 
-                   ( int*  bzerror, 
-                     FILE* f, 
-                     int   verbosity,
-                     int   small,
-                     void* unused,
-                     int   nUnused )
-{
-   bzFile* bzf = NULL;
-   int     ret;
-
-   BZ_SETERR(BZ_OK);
-
-   if (f == NULL || 
-       (small != 0 && small != 1) ||
-       (verbosity < 0 || verbosity > 4) ||
-       (unused == NULL && nUnused != 0) ||
-       (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
-      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
-
-   if (ferror(f))
-      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
-
-   bzf = malloc ( sizeof(bzFile) );
-   if (bzf == NULL) 
-      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
-
-   BZ_SETERR(BZ_OK);
-
-   bzf->initialisedOk = False;
-   bzf->handle        = f;
-   bzf->bufN          = 0;
-   bzf->writing       = False;
-   bzf->strm.bzalloc  = NULL;
-   bzf->strm.bzfree   = NULL;
-   bzf->strm.opaque   = NULL;
-   
-   while (nUnused > 0) {
-      bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
-      unused = ((void*)( 1 + ((UChar*)(unused))  ));
-      nUnused--;
-   }
-
-   ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
-   if (ret != BZ_OK)
-      { BZ_SETERR(ret); free(bzf); return NULL; };
-
-   bzf->strm.avail_in = bzf->bufN;
-   bzf->strm.next_in  = bzf->buf;
-
-   bzf->initialisedOk = True;
-   return bzf;   
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
-{
-   bzFile* bzf = (bzFile*)b;
-
-   BZ_SETERR(BZ_OK);
-   if (bzf == NULL)
-      { BZ_SETERR(BZ_OK); return; };
-
-   if (bzf->writing)
-      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
-
-   if (bzf->initialisedOk)
-      (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
-   free ( bzf );
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzRead) 
-           ( int*    bzerror, 
-             BZFILE* b, 
-             void*   buf, 
-             int     len )
-{
-   Int32   n, ret;
-   bzFile* bzf = (bzFile*)b;
-
-   BZ_SETERR(BZ_OK);
-
-   if (bzf == NULL || buf == NULL || len < 0)
-      { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
-
-   if (bzf->writing)
-      { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
-
-   if (len == 0)
-      { BZ_SETERR(BZ_OK); return 0; };
-
-   bzf->strm.avail_out = len;
-   bzf->strm.next_out = buf;
-
-   while (True) {
-
-      if (ferror(bzf->handle)) 
-         { BZ_SETERR(BZ_IO_ERROR); return 0; };
-
-      if (bzf->strm.avail_in == 0 && !bz_feof(bzf->handle)) {
-         n = fread ( bzf->buf, sizeof(UChar), 
-                     BZ_MAX_UNUSED, bzf->handle );
-         if (ferror(bzf->handle))
-            { BZ_SETERR(BZ_IO_ERROR); return 0; };
-         bzf->bufN = n;
-         bzf->strm.avail_in = bzf->bufN;
-         bzf->strm.next_in = bzf->buf;
-      }
-
-      ret = BZ2_bzDecompress ( &(bzf->strm) );
-
-      if (ret != BZ_OK && ret != BZ_STREAM_END)
-         { BZ_SETERR(ret); return 0; };
-
-      if (ret == BZ_OK && bz_feof(bzf->handle) && 
-          bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
-         { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
-
-      if (ret == BZ_STREAM_END)
-         { BZ_SETERR(BZ_STREAM_END);
-           return len - bzf->strm.avail_out; };
-      if (bzf->strm.avail_out == 0)
-         { BZ_SETERR(BZ_OK); return len; };
-      
-   }
-
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzReadGetUnused) 
-                     ( int*    bzerror, 
-                       BZFILE* b, 
-                       void**  unused, 
-                       int*    nUnused )
-{
-   bzFile* bzf = (bzFile*)b;
-   if (bzf == NULL)
-      { BZ_SETERR(BZ_PARAM_ERROR); return; };
-   if (bzf->lastErr != BZ_STREAM_END)
-      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
-   if (unused == NULL || nUnused == NULL)
-      { BZ_SETERR(BZ_PARAM_ERROR); return; };
-
-   BZ_SETERR(BZ_OK);
-   *nUnused = bzf->strm.avail_in;
-   *unused = bzf->strm.next_in;
-}
diff --git a/sys/src/external/bzip2/lib/bzstdio.c b/sys/src/external/bzip2/lib/bzstdio.c
deleted file mode 100644
index 3e1f2de5..00000000
--- a/sys/src/external/bzip2/lib/bzstdio.c
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-Bool bz_feof ( FILE* f )
-{
-   Int32 c = fgetc ( f );
-   if (c == EOF) return True;
-   ungetc ( c, f );
-   return False;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzversion.c b/sys/src/external/bzip2/lib/bzversion.c
deleted file mode 100644
index 5320144b..00000000
--- a/sys/src/external/bzip2/lib/bzversion.c
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-
-/*---------------------------------------------------*/
-/*--
-   return version like "0.9.0c".
---*/
-const char * BZ_API(BZ2_bzlibVersion)(void)
-{
-   return BZ_VERSION;
-}
-
diff --git a/sys/src/external/bzip2/lib/bzwrite.c b/sys/src/external/bzip2/lib/bzwrite.c
deleted file mode 100644
index a37a66ba..00000000
--- a/sys/src/external/bzip2/lib/bzwrite.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/* THIS FILE HAS BEEN MODIFIED -- rsc split bzlib.c into bzlib.c,
-		bzlibcompress.c, bzlibdecompress.c, bzlibread.c, bzlibwrite.c
- */
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-#include "bzlib_stdio.h"
-#include "bzlib_stdio_private.h"
-
-/*---------------------------------------------------*/
-BZFILE* BZ_API(BZ2_bzWriteOpen) 
-                    ( int*  bzerror,      
-                      FILE* f, 
-                      int   blockSize100k, 
-                      int   verbosity,
-                      int   workFactor )
-{
-   Int32   ret;
-   bzFile* bzf = NULL;
-
-   BZ_SETERR(BZ_OK);
-
-   if (f == NULL ||
-       (blockSize100k < 1 || blockSize100k > 9) ||
-       (workFactor < 0 || workFactor > 250) ||
-       (verbosity < 0 || verbosity > 4))
-      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
-
-   if (ferror(f))
-      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
-
-   bzf = malloc ( sizeof(bzFile) );
-   if (bzf == NULL)
-      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
-
-   BZ_SETERR(BZ_OK);
-   bzf->initialisedOk = False;
-   bzf->bufN          = 0;
-   bzf->handle        = f;
-   bzf->writing       = True;
-   bzf->strm.bzalloc  = NULL;
-   bzf->strm.bzfree   = NULL;
-   bzf->strm.opaque   = NULL;
-
-   if (workFactor == 0) workFactor = 30;
-   ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k, 
-                              verbosity, workFactor );
-   if (ret != BZ_OK)
-      { BZ_SETERR(ret); free(bzf); return NULL; };
-
-   bzf->strm.avail_in = 0;
-   bzf->initialisedOk = True;
-   return bzf;   
-}
-
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzWrite)
-             ( int*    bzerror, 
-               BZFILE* b, 
-               void*   buf, 
-               int     len )
-{
-   Int32 n, n2, ret;
-   bzFile* bzf = (bzFile*)b;
-
-   BZ_SETERR(BZ_OK);
-   if (bzf == NULL || buf == NULL || len < 0)
-      { BZ_SETERR(BZ_PARAM_ERROR); return; };
-   if (!(bzf->writing))
-      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
-   if (ferror(bzf->handle))
-      { BZ_SETERR(BZ_IO_ERROR); return; };
-
-   if (len == 0)
-      { BZ_SETERR(BZ_OK); return; };
-
-   bzf->strm.avail_in = len;
-   bzf->strm.next_in  = buf;
-
-   while (True) {
-      bzf->strm.avail_out = BZ_MAX_UNUSED;
-      bzf->strm.next_out = bzf->buf;
-      ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
-      if (ret != BZ_RUN_OK)
-         { BZ_SETERR(ret); return; };
-
-      if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
-         n = BZ_MAX_UNUSED - bzf->strm.avail_out;
-         n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
-                       n, bzf->handle );
-         if (n != n2 || ferror(bzf->handle))
-            { BZ_SETERR(BZ_IO_ERROR); return; };
-      }
-
-      if (bzf->strm.avail_in == 0)
-         { BZ_SETERR(BZ_OK); return; };
-   }
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzWriteClose)
-                  ( int*          bzerror, 
-                    BZFILE*       b, 
-                    int           abandon,
-                    unsigned int* nbytes_in,
-                    unsigned int* nbytes_out )
-{
-   BZ2_bzWriteClose64 ( bzerror, b, abandon, 
-                        nbytes_in, NULL, nbytes_out, NULL );
-}
-
-
-void BZ_API(BZ2_bzWriteClose64)
-                  ( int*          bzerror, 
-                    BZFILE*       b, 
-                    int           abandon,
-                    unsigned int* nbytes_in_lo32,
-                    unsigned int* nbytes_in_hi32,
-                    unsigned int* nbytes_out_lo32,
-                    unsigned int* nbytes_out_hi32 )
-{
-   Int32   n, n2, ret;
-   bzFile* bzf = (bzFile*)b;
-
-   if (bzf == NULL)
-      { BZ_SETERR(BZ_OK); return; };
-   if (!(bzf->writing))
-      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
-   if (ferror(bzf->handle))
-      { BZ_SETERR(BZ_IO_ERROR); return; };
-
-   if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
-   if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
-   if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
-   if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
-
-   if ((!abandon) && bzf->lastErr == BZ_OK) {
-      while (True) {
-         bzf->strm.avail_out = BZ_MAX_UNUSED;
-         bzf->strm.next_out = bzf->buf;
-         ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
-         if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
-            { BZ_SETERR(ret); return; };
-
-         if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
-            n = BZ_MAX_UNUSED - bzf->strm.avail_out;
-            n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
-                          n, bzf->handle );
-            if (n != n2 || ferror(bzf->handle))
-               { BZ_SETERR(BZ_IO_ERROR); return; };
-         }
-
-         if (ret == BZ_STREAM_END) break;
-      }
-   }
-
-   if ( !abandon && !ferror ( bzf->handle ) ) {
-      fflush ( bzf->handle );
-      if (ferror(bzf->handle))
-         { BZ_SETERR(BZ_IO_ERROR); return; };
-   }
-
-   if (nbytes_in_lo32 != NULL)
-      *nbytes_in_lo32 = bzf->strm.total_in_lo32;
-   if (nbytes_in_hi32 != NULL)
-      *nbytes_in_hi32 = bzf->strm.total_in_hi32;
-   if (nbytes_out_lo32 != NULL)
-      *nbytes_out_lo32 = bzf->strm.total_out_lo32;
-   if (nbytes_out_hi32 != NULL)
-      *nbytes_out_hi32 = bzf->strm.total_out_hi32;
-
-   BZ_SETERR(BZ_OK);
-   BZ2_bzCompressEnd ( &(bzf->strm) );
-   free ( bzf );
-}
-
diff --git a/sys/src/external/bzip2/lib/bzzlib.c b/sys/src/external/bzip2/lib/bzzlib.c
deleted file mode 100644
index 87b69128..00000000
--- a/sys/src/external/bzip2/lib/bzzlib.c
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
- * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL
- * FROM THE BZIP2 DISTRIBUTION.
- *
- * It has been modified, mainly to break the library
- * into smaller pieces.
- *
- * Russ Cox
- * rsc@plan9.bell-labs.com
- * July 2000
- */
-
-/*-------------------------------------------------------------*/
-/*--- Library top-level functions.                          ---*/
-/*---                                               bzlib.c ---*/
-/*-------------------------------------------------------------*/
-
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
-
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
-
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
-
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
-
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-/*--
-   CHANGES
-   ~~~~~~~
-   0.9.0 -- original version.
-
-   0.9.0a/b -- no changes in this file.
-
-   0.9.0c
-      * made zero-length BZ_FLUSH work correctly in bzCompress().
-      * fixed bzWrite/bzRead to ignore zero-length requests.
-      * fixed bzread to correctly handle read requests after EOF.
-      * wrong parameter order in call to bzDecompressInit in
-        bzBuffToBuffDecompress.  Fixed.
---*/
-
-#include "os.h"
-#include "bzlib.h"
-#include "bzlib_private.h"
-#include "bzlib_stdio.h"
-#include "bzlib_stdio_private.h"
-
-/*---------------------------------------------------*/
-/*--
-   Code contributed by Yoshioka Tsuneo
-   (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
-   to support better zlib compatibility.
-   This code is not _officially_ part of libbzip2 (yet);
-   I haven't tested it, documented it, or considered the
-   threading-safeness of it.
-   If this code breaks, please contact both Yoshioka and me.
---*/
-/*---------------------------------------------------*/
-
-/*---------------------------------------------------*/
-
-#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
-#   include 
-#   include 
-#   define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
-#else
-#   define SET_BINARY_MODE(file)
-#endif
-static
-BZFILE * bzopen_or_bzdopen
-               ( const char *path,   /* no use when bzdopen */
-                 int fd,             /* no use when bzdopen */
-                 const char *mode,
-                 int open_mode)      /* bzopen: 0, bzdopen:1 */
-{
-   int    bzerr;
-   char   unused[BZ_MAX_UNUSED];
-   int    blockSize100k = 9;
-   int    writing       = 0;
-   char   mode2[10]     = "";
-   FILE   *fp           = NULL;
-   BZFILE *bzfp         = NULL;
-   int    verbosity     = 0;
-   int    workFactor    = 30;
-   int    smallMode     = 0;
-   int    nUnused       = 0; 
-
-   if (mode == NULL) return NULL;
-   while (*mode) {
-      switch (*mode) {
-      case 'r':
-         writing = 0; break;
-      case 'w':
-         writing = 1; break;
-      case 's':
-         smallMode = 1; break;
-      default:
-         if (isdigit((int)(*mode))) {
-            blockSize100k = *mode-'0';
-         }
-      }
-      mode++;
-   }
-   strcat(mode2, writing ? "w" : "r" );
-   strcat(mode2,"b");   /* binary mode */
-
-   if (open_mode==0) {
-      if (path==NULL || strcmp(path,"")==0) {
-        fp = (writing ? stdout : stdin);
-        SET_BINARY_MODE(fp);
-      } else {
-        fp = fopen(path,mode2);
-      }
-   } else {
-#ifdef BZ_STRICT_ANSI
-      fp = NULL;
-#else
-      fp = fdopen(fd,mode2);
-#endif
-   }
-   if (fp == NULL) return NULL;
-
-   if (writing) {
-      /* Guard against total chaos and anarchy -- JRS */
-      if (blockSize100k < 1) blockSize100k = 1;
-      if (blockSize100k > 9) blockSize100k = 9; 
-      bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
-                             verbosity,workFactor);
-   } else {
-      bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
-                            unused,nUnused);
-   }
-   if (bzfp == NULL) {
-      if (fp != stdin && fp != stdout) fclose(fp);
-      return NULL;
-   }
-   return bzfp;
-}
-
-
-/*---------------------------------------------------*/
-/*--
-   open file for read or write.
-      ex) bzopen("file","w9")
-      case path="" or NULL => use stdin or stdout.
---*/
-BZFILE * BZ_API(BZ2_bzopen)
-               ( const char *path,
-                 const char *mode )
-{
-   return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
-}
-
-
-/*---------------------------------------------------*/
-BZFILE * BZ_API(BZ2_bzdopen)
-               ( int fd,
-                 const char *mode )
-{
-   return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
-{
-   int bzerr, nread;
-   if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
-   nread = BZ2_bzRead(&bzerr,b,buf,len);
-   if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
-      return nread;
-   } else {
-      return -1;
-   }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
-{
-   int bzerr;
-
-   BZ2_bzWrite(&bzerr,b,buf,len);
-   if(bzerr == BZ_OK){
-      return len;
-   }else{
-      return -1;
-   }
-}
-
-
-/*---------------------------------------------------*/
-int BZ_API(BZ2_bzflush) (BZFILE *b)
-{
-   /* do nothing now... */
-   return 0;
-}
-
-
-/*---------------------------------------------------*/
-void BZ_API(BZ2_bzclose) (BZFILE* b)
-{
-   int bzerr;
-   FILE *fp = ((bzFile *)b)->handle;
-   
-   if (b==NULL) {return;}
-   if(((bzFile*)b)->writing){
-      BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
-      if(bzerr != BZ_OK){
-         BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
-      }
-   }else{
-      BZ2_bzReadClose(&bzerr,b);
-   }
-   if(fp!=stdin && fp!=stdout){
-      fclose(fp);
-   }
-}
-
-
-/*---------------------------------------------------*/
-/*--
-   return last error code 
---*/
-static char *bzerrorstrings[] = {
-       "OK"
-      ,"SEQUENCE_ERROR"
-      ,"PARAM_ERROR"
-      ,"MEM_ERROR"
-      ,"DATA_ERROR"
-      ,"DATA_ERROR_MAGIC"
-      ,"IO_ERROR"
-      ,"UNEXPECTED_EOF"
-      ,"OUTBUFF_FULL"
-      ,"CONFIG_ERROR"
-      ,"???"   /* for future */
-      ,"???"   /* for future */
-      ,"???"   /* for future */
-      ,"???"   /* for future */
-      ,"???"   /* for future */
-      ,"???"   /* for future */
-};
-
-
-const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
-{
-   int err = ((bzFile *)b)->lastErr;
-
-   if(err>0) err = 0;
-   *errnum = err;
-   return bzerrorstrings[err*-1];
-}
diff --git a/sys/src/external/bzip2/lib/mkfile b/sys/src/external/bzip2/lib/mkfile
deleted file mode 100644
index 146f9375..00000000
--- a/sys/src/external/bzip2/lib/mkfile
+++ /dev/null
@@ -1,35 +0,0 @@
-
-#include 
-#include 
-
-#define exit(x) exits((x) ? "whoops" : nil)
-#define size_t ulong
diff --git a/sys/src/external/bzip2/lib/unix.h b/sys/src/external/bzip2/lib/unix.h
deleted file mode 100644
index e47197b8..00000000
--- a/sys/src/external/bzip2/lib/unix.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#include 
-#include 
-#include 
-#include 
-#include 
-#include 
-#include 
-
diff --git a/sys/src/external/bzip2/libbz2.def b/sys/src/external/bzip2/libbz2.def
new file mode 100644
index 00000000..2dc0dd89
--- /dev/null
+++ b/sys/src/external/bzip2/libbz2.def
@@ -0,0 +1,27 @@
+LIBRARY			LIBBZ2
+DESCRIPTION		"libbzip2: library for data compression"
+EXPORTS
+	BZ2_bzCompressInit
+	BZ2_bzCompress
+	BZ2_bzCompressEnd
+	BZ2_bzDecompressInit
+	BZ2_bzDecompress
+	BZ2_bzDecompressEnd
+	BZ2_bzReadOpen
+	BZ2_bzReadClose
+	BZ2_bzReadGetUnused
+	BZ2_bzRead
+	BZ2_bzWriteOpen
+	BZ2_bzWrite
+	BZ2_bzWriteClose
+	BZ2_bzWriteClose64
+	BZ2_bzBuffToBuffCompress
+	BZ2_bzBuffToBuffDecompress
+	BZ2_bzlibVersion
+	BZ2_bzopen
+	BZ2_bzdopen
+	BZ2_bzread
+	BZ2_bzwrite
+	BZ2_bzflush
+	BZ2_bzclose
+	BZ2_bzerror
diff --git a/sys/src/external/bzip2/libbz2.dsp b/sys/src/external/bzip2/libbz2.dsp
new file mode 100644
index 00000000..a21a20f7
--- /dev/null
+++ b/sys/src/external/bzip2/libbz2.dsp
@@ -0,0 +1,130 @@
+# Microsoft Developer Studio Project File - Name="libbz2" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 5.00
+# ** •ÒW‚µ‚È‚¢‚Å‚­‚¾‚³‚¢ **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+
+CFG=libbz2 - Win32 Debug
+!MESSAGE ‚±‚ê‚Í—LŒø‚ÈÒ²¸Ì§²Ù‚Å‚Í‚ ‚è‚Ü‚¹‚ñB ‚±‚ÌÌßÛ¼Þª¸Ä‚ðËÞÙÄÞ‚·‚邽‚ß‚É‚Í NMAKE ‚ðŽg—p‚µ‚Ä‚­‚¾‚³‚¢B
+!MESSAGE [Ò²¸Ì§²Ù‚Ì´¸½Îß°Ä] ºÏÝÄÞ‚ðŽg—p‚µ‚ÄŽÀs‚µ‚Ä‚­‚¾‚³‚¢
+!MESSAGE 
+!MESSAGE NMAKE /f "libbz2.mak".
+!MESSAGE 
+!MESSAGE NMAKE ‚ÌŽÀsŽž‚É\¬‚ðŽw’è‚Å‚«‚Ü‚·
+!MESSAGE ºÏÝÄÞ ×²Ýã‚ÅϸۂÌÝ’è‚ð’è‹`‚µ‚Ü‚·B—á:
+!MESSAGE 
+!MESSAGE NMAKE /f "libbz2.mak" CFG="libbz2 - Win32 Debug"
+!MESSAGE 
+!MESSAGE ‘I‘ð‰Â”\‚ÈËÞÙÄÞ Ó°ÄÞ:
+!MESSAGE 
+!MESSAGE "libbz2 - Win32 Release" ("Win32 (x86) Dynamic-Link Library" —p)
+!MESSAGE "libbz2 - Win32 Debug" ("Win32 (x86) Dynamic-Link Library" —p)
+!MESSAGE 
+
+# Begin Project
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "libbz2 - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32
+# ADD BASE RSC /l 0x411 /d "NDEBUG"
+# ADD RSC /l 0x411 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386 /out:"libbz2.dll"
+
+!ELSEIF  "$(CFG)" == "libbz2 - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /FD /c
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /o NUL /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /o NUL /win32
+# ADD BASE RSC /l 0x411 /d "_DEBUG"
+# ADD RSC /l 0x411 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386 /out:"libbz2.dll" /pdbtype:sept
+
+!ENDIF 
+
+# Begin Target
+
+# Name "libbz2 - Win32 Release"
+# Name "libbz2 - Win32 Debug"
+# Begin Source File
+
+SOURCE=.\blocksort.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\bzlib.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\bzlib.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\bzlib_private.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\compress.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\crctable.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\decompress.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\huffman.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\libbz2.def
+# End Source File
+# Begin Source File
+
+SOURCE=.\randtable.c
+# End Source File
+# End Target
+# End Project
diff --git a/sys/src/external/bzip2/makefile.msc b/sys/src/external/bzip2/makefile.msc
new file mode 100644
index 00000000..799a18a5
--- /dev/null
+++ b/sys/src/external/bzip2/makefile.msc
@@ -0,0 +1,63 @@
+# Makefile for Microsoft Visual C++ 6.0
+# usage: nmake -f makefile.msc
+# K.M. Syring (syring@gsf.de)
+# Fixed up by JRS for bzip2-0.9.5d release.
+
+CC=cl
+CFLAGS= -DWIN32 -MD -Ox -D_FILE_OFFSET_BITS=64 -nologo
+
+OBJS= blocksort.obj  \
+      huffman.obj    \
+      crctable.obj   \
+      randtable.obj  \
+      compress.obj   \
+      decompress.obj \
+      bzlib.obj
+
+all: lib bzip2 test
+
+bzip2: lib
+	$(CC) $(CFLAGS) -o bzip2 bzip2.c libbz2.lib setargv.obj
+	$(CC) $(CFLAGS) -o bzip2recover bzip2recover.c
+
+lib: $(OBJS)
+	lib /out:libbz2.lib $(OBJS)
+
+test: bzip2
+	type words1
+	.\\bzip2 -1  < sample1.ref > sample1.rb2
+	.\\bzip2 -2  < sample2.ref > sample2.rb2
+	.\\bzip2 -3  < sample3.ref > sample3.rb2
+	.\\bzip2 -d  < sample1.bz2 > sample1.tst
+	.\\bzip2 -d  < sample2.bz2 > sample2.tst
+	.\\bzip2 -ds < sample3.bz2 > sample3.tst
+	@echo All six of the fc's should find no differences.
+	@echo If fc finds an error on sample3.bz2, this could be
+	@echo because WinZip's 'TAR file smart CR/LF conversion'
+	@echo is too clever for its own good.  Disable this option.
+	@echo The correct size for sample3.ref is 120,244.  If it
+	@echo is 150,251, WinZip has messed it up.
+	fc sample1.bz2 sample1.rb2 
+	fc sample2.bz2 sample2.rb2
+	fc sample3.bz2 sample3.rb2
+	fc sample1.tst sample1.ref
+	fc sample2.tst sample2.ref
+	fc sample3.tst sample3.ref
+
+
+
+clean: 
+	del *.obj
+	del libbz2.lib 
+	del bzip2.exe
+	del bzip2recover.exe
+	del sample1.rb2 
+	del sample2.rb2 
+	del sample3.rb2
+	del sample1.tst 
+	del sample2.tst
+	del sample3.tst
+
+.c.obj: 
+	$(CC) $(CFLAGS) -c $*.c -o $*.obj
+
diff --git a/sys/src/external/bzip2/manual.xml b/sys/src/external/bzip2/manual.xml
new file mode 100644
index 00000000..ba0480ec
--- /dev/null
+++ b/sys/src/external/bzip2/manual.xml
@@ -0,0 +1,2979 @@
+ 
+
+ %common-ents;
+]>
+
+
+
+ 
+  bzip2 and libbzip2, version &bz-version;
+  A program and library for data compression
+  
+   &bz-lifespan;
+   Julian Seward
+  
+  Version &bz-version; of &bz-date;
+
+  
+   
+    Julian
+    Seward
+    
+     &bz-url;
+    
+   
+  
+
+  
+
+  This program, bzip2, the
+  associated library libbzip2, and
+  all documentation, are copyright © &bz-lifespan; Julian Seward.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with
+  or without modification, are permitted provided that the
+  following conditions are met:
+
+  
+
+   Redistributions of source code must retain the
+   above copyright notice, this list of conditions and the
+   following disclaimer.
+
+   The origin of this software must not be
+   misrepresented; you must not claim that you wrote the original
+   software.  If you use this software in a product, an
+   acknowledgment in the product documentation would be
+   appreciated but is not required.
+
+   Altered source versions must be plainly marked
+   as such, and must not be misrepresented as being the original
+   software.
+
+   The name of the author may not be used to
+   endorse or promote products derived from this software without
+   specific prior written permission.
+
+  
+
+  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY
+  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+  PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+  AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+  THE POSSIBILITY OF SUCH DAMAGE.
+
+ PATENTS: To the best of my knowledge,
+ bzip2 and
+ libbzip2 do not use any patented
+ algorithms.  However, I do not have the resources to carry
+ out a patent search.  Therefore I cannot give any guarantee of
+ the above statement.
+ 
+
+
+
+
+
+
+
+
+Introduction
+
+bzip2 compresses files
+using the Burrows-Wheeler block-sorting text compression
+algorithm, and Huffman coding.  Compression is generally
+considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of
+the PPM family of statistical compressors.
+
+bzip2 is built on top of
+libbzip2, a flexible library for
+handling compressed data in the
+bzip2 format.  This manual
+describes both how to use the program and how to work with the
+library interface.  Most of the manual is devoted to this
+library, not the program, which is good news if your interest is
+only in the program.
+
+
+
+  describes how to use
+ bzip2; this is the only part
+ you need to read if you just want to know how to operate the
+ program.
+
+  describes the
+ programming interfaces in detail, and
+
+  records some
+ miscellaneous notes which I thought ought to be recorded
+ somewhere.
+
+
+
+
+
+
+
+How to use bzip2
+
+This chapter contains a copy of the
+bzip2 man page, and nothing
+else.
+
+
+NAME
+
+
+
+ bzip2,
+  bunzip2 - a block-sorting file
+  compressor, v&bz-version;
+
+ bzcat -
+   decompresses files to stdout
+
+ bzip2recover -
+   recovers data from damaged bzip2 files
+
+
+
+
+
+
+
+SYNOPSIS
+
+
+
+ bzip2 [
+  -cdfkqstvzVL123456789 ] [ filenames ...  ]
+
+ bzip2 [
+  -h | --help ]
+
+ bunzip2 [
+  -fkvsVL ] [ filenames ...  ]
+
+ bunzip2 [
+  -h | --help ]
+
+ bzcat [ -s ] [
+  filenames ...  ]
+
+ bzcat [
+  -h | --help ]
+
+ bzip2recover
+  filename
+
+
+
+
+
+
+
+DESCRIPTION
+
+bzip2 compresses files
+using the Burrows-Wheeler block sorting text compression
+algorithm, and Huffman coding.  Compression is generally
+considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of
+the PPM family of statistical compressors.
+
+The command-line options are deliberately very similar to
+those of GNU gzip, but they are
+not identical.
+
+bzip2 expects a list of
+file names to accompany the command-line flags.  Each file is
+replaced by a compressed version of itself, with the name
+original_name.bz2.  Each
+compressed file has the same modification date, permissions, and,
+when possible, ownership as the corresponding original, so that
+these properties can be correctly restored at decompression time.
+File name handling is naive in the sense that there is no
+mechanism for preserving original file names, permissions,
+ownerships or dates in filesystems which lack these concepts, or
+have serious file name length restrictions, such as
+MS-DOS.
+
+bzip2 and
+bunzip2 will by default not
+overwrite existing files.  If you want this to happen, specify
+the -f flag.
+
+If no file names are specified,
+bzip2 compresses from standard
+input to standard output.  In this case,
+bzip2 will decline to write
+compressed output to a terminal, as this would be entirely
+incomprehensible and therefore pointless.
+
+bunzip2 (or
+bzip2 -d) decompresses all
+specified files.  Files which were not created by
+bzip2 will be detected and
+ignored, and a warning issued.
+bzip2 attempts to guess the
+filename for the decompressed file from that of the compressed
+file as follows:
+
+
+
+ filename.bz2 
+  becomes
+  filename
+
+ filename.bz 
+  becomes
+  filename
+
+ filename.tbz2
+  becomes
+  filename.tar
+
+ filename.tbz 
+  becomes
+  filename.tar
+
+ anyothername 
+  becomes
+  anyothername.out
+
+
+
+If the file does not end in one of the recognised endings,
+.bz2,
+.bz,
+.tbz2 or
+.tbz,
+bzip2 complains that it cannot
+guess the name of the original file, and uses the original name
+with .out appended.
+
+As with compression, supplying no filenames causes
+decompression from standard input to standard output.
+
+bunzip2 will correctly
+decompress a file which is the concatenation of two or more
+compressed files.  The result is the concatenation of the
+corresponding uncompressed files.  Integrity testing
+(-t) of concatenated compressed
+files is also supported.
+
+You can also compress or decompress files to the standard
+output by giving the -c flag.
+Multiple files may be compressed and decompressed like this.  The
+resulting outputs are fed sequentially to stdout.  Compression of
+multiple files in this manner generates a stream containing
+multiple compressed file representations.  Such a stream can be
+decompressed correctly only by
+bzip2 version 0.9.0 or later.
+Earlier versions of bzip2 will
+stop after decompressing the first file in the stream.
+
+bzcat (or
+bzip2 -dc) decompresses all
+specified files to the standard output.
+
+bzip2 will read arguments
+from the environment variables
+BZIP2 and
+BZIP, in that order, and will
+process them before any arguments read from the command line.
+This gives a convenient way to supply default arguments.
+
+Compression is always performed, even if the compressed
+file is slightly larger than the original.  Files of less than
+about one hundred bytes tend to get larger, since the compression
+mechanism has a constant overhead in the region of 50 bytes.
+Random data (including the output of most file compressors) is
+coded at about 8.05 bits per byte, giving an expansion of around
+0.5%.
+
+As a self-check for your protection,
+bzip2 uses 32-bit CRCs to make
+sure that the decompressed version of a file is identical to the
+original.  This guards against corruption of the compressed data,
+and against undetected bugs in
+bzip2 (hopefully very unlikely).
+The chances of data corruption going undetected is microscopic,
+about one chance in four billion for each file processed.  Be
+aware, though, that the check occurs upon decompression, so it
+can only tell you that something is wrong.  It can't help you
+recover the original uncompressed data.  You can use
+bzip2recover to try to recover
+data from damaged files.
+
+Return values: 0 for a normal exit, 1 for environmental
+problems (file not found, invalid flags, I/O errors, etc.), 2
+to indicate a corrupt compressed file, 3 for an internal
+consistency error (eg, bug) which caused
+bzip2 to panic.
+
+
+
+
+
+OPTIONS
+
+
+
+ 
+ -c --stdout
+ Compress or decompress to standard
+  output.
+ 
+
+ 
+ -d --decompress
+ Force decompression.
+  bzip2,
+  bunzip2 and
+  bzcat are really the same
+  program, and the decision about what actions to take is done on
+  the basis of which name is used.  This flag overrides that
+  mechanism, and forces bzip2 to decompress.
+ 
+
+ 
+ -z --compress
+ The complement to
+  -d: forces compression,
+  regardless of the invokation name.
+ 
+
+ 
+ -t --test
+ Check integrity of the specified file(s), but
+  don't decompress them.  This really performs a trial
+  decompression and throws away the result.
+ 
+
+ 
+ -f --force
+ Force overwrite of output files.  Normally,
+  bzip2 will not overwrite
+  existing output files.  Also forces
+  bzip2 to break hard links to
+  files, which it otherwise wouldn't do.
+  bzip2 normally declines
+  to decompress files which don't have the correct magic header
+  bytes. If forced (-f),
+  however, it will pass such files through unmodified. This is
+  how GNU gzip behaves.
+ 
+ 
+
+ 
+ -k --keep
+ Keep (don't delete) input files during
+  compression or decompression.
+ 
+
+ 
+ -s --small
+ Reduce memory usage, for compression,
+  decompression and testing.  Files are decompressed and tested
+  using a modified algorithm which only requires 2.5 bytes per
+  block byte.  This means any file can be decompressed in 2300k
+  of memory, albeit at about half the normal speed.
+  During compression, -s
+  selects a block size of 200k, which limits memory use to around
+  the same figure, at the expense of your compression ratio.  In
+  short, if your machine is low on memory (8 megabytes or less),
+  use -s for everything.  See
+   below.
+ 
+
+ 
+ -q --quiet
+ Suppress non-essential warning messages.
+  Messages pertaining to I/O errors and other critical events
+  will not be suppressed.
+ 
+
+ -h --help
+ Print a help message and exit.
+ 
+
+ 
+ -v --verbose
+ Verbose mode -- show the compression ratio for
+  each file processed.  Further
+  -v's increase the verbosity
+  level, spewing out lots of information which is primarily of
+  interest for diagnostic purposes.
+ 
+
+ 
+ -L --license -V --version
+ Display the software version, license terms and
+  conditions.
+ 
+
+ 
+ -1 (or
+ --fast) to
+ -9 (or
+ -best)
+ Set the block size to 100 k, 200 k ...  900 k
+  when compressing.  Has no effect when decompressing.  See  below.  The
+  --fast and
+  --best aliases are primarily
+  for GNU gzip compatibility.
+  In particular, --fast doesn't
+  make things significantly faster.  And
+  --best merely selects the
+  default behaviour.
+ 
+
+ 
+ --
+ Treats all subsequent arguments as file names,
+  even if they start with a dash.  This is so you can handle
+  files with names beginning with a dash, for example:
+  bzip2 --
+  -myfilename.
+ 
+
+ 
+ --repetitive-fast
+ --repetitive-best
+ These flags are redundant in versions 0.9.5 and
+  above.  They provided some coarse control over the behaviour of
+  the sorting algorithm in earlier versions, which was sometimes
+  useful.  0.9.5 and above have an improved algorithm which
+  renders these flags irrelevant.
+ 
+
+
+
+
+
+
+
+MEMORY MANAGEMENT
+
+bzip2 compresses large
+files in blocks.  The block size affects both the compression
+ratio achieved, and the amount of memory needed for compression
+and decompression.  The flags -1
+through -9 specify the block
+size to be 100,000 bytes through 900,000 bytes (the default)
+respectively.  At decompression time, the block size used for
+compression is read from the header of the compressed file, and
+bunzip2 then allocates itself
+just enough memory to decompress the file.  Since block sizes are
+stored in compressed files, it follows that the flags
+-1 to
+-9 are irrelevant to and so
+ignored during decompression.
+
+Compression and decompression requirements, in bytes, can be
+estimated as:
+
+Compression:   400k + ( 8 x block size )
+
+Decompression: 100k + ( 4 x block size ), or
+               100k + ( 2.5 x block size )
+
+
+Larger block sizes give rapidly diminishing marginal
+returns.  Most of the compression comes from the first two or
+three hundred k of block size, a fact worth bearing in mind when
+using bzip2 on small machines.
+It is also important to appreciate that the decompression memory
+requirement is set at compression time by the choice of block
+size.
+
+For files compressed with the default 900k block size,
+bunzip2 will require about 3700
+kbytes to decompress.  To support decompression of any file on a
+4 megabyte machine, bunzip2 has
+an option to decompress using approximately half this amount of
+memory, about 2300 kbytes.  Decompression speed is also halved,
+so you should use this option only where necessary.  The relevant
+flag is -s.
+
+In general, try and use the largest block size memory
+constraints allow, since that maximises the compression achieved.
+Compression and decompression speed are virtually unaffected by
+block size.
+
+Another significant point applies to files which fit in a
+single block -- that means most files you'd encounter using a
+large block size.  The amount of real memory touched is
+proportional to the size of the file, since the file is smaller
+than a block.  For example, compressing a file 20,000 bytes long
+with the flag -9 will cause the
+compressor to allocate around 7600k of memory, but only touch
+400k + 20000 * 8 = 560 kbytes of it.  Similarly, the decompressor
+will allocate 3700k but only touch 100k + 20000 * 4 = 180
+kbytes.
+
+Here is a table which summarises the maximum memory usage
+for different block sizes.  Also recorded is the total compressed
+size for 14 files of the Calgary Text Compression Corpus
+totalling 3,141,622 bytes.  This column gives some feel for how
+compression varies with block size.  These figures tend to
+understate the advantage of larger block sizes for larger files,
+since the Corpus is dominated by smaller files.
+
+
+        Compress   Decompress   Decompress   Corpus
+Flag     usage      usage       -s usage     Size
+
+ -1      1200k       500k         350k      914704
+ -2      2000k       900k         600k      877703
+ -3      2800k      1300k         850k      860338
+ -4      3600k      1700k        1100k      846899
+ -5      4400k      2100k        1350k      845160
+ -6      5200k      2500k        1600k      838626
+ -7      6100k      2900k        1850k      834096
+ -8      6800k      3300k        2100k      828642
+ -9      7600k      3700k        2350k      828642
+
+
+
+
+
+
+RECOVERING DATA FROM DAMAGED FILES
+
+bzip2 compresses files in
+blocks, usually 900kbytes long.  Each block is handled
+independently.  If a media or transmission error causes a
+multi-block .bz2 file to become
+damaged, it may be possible to recover data from the undamaged
+blocks in the file.
+
+The compressed representation of each block is delimited by
+a 48-bit pattern, which makes it possible to find the block
+boundaries with reasonable certainty.  Each block also carries
+its own 32-bit CRC, so damaged blocks can be distinguished from
+undamaged ones.
+
+bzip2recover is a simple
+program whose purpose is to search for blocks in
+.bz2 files, and write each block
+out into its own .bz2 file.  You
+can then use bzip2 -t to test
+the integrity of the resulting files, and decompress those which
+are undamaged.
+
+bzip2recover takes a
+single argument, the name of the damaged file, and writes a
+number of files rec0001file.bz2,
+rec0002file.bz2, etc, containing
+the extracted blocks.  The output filenames are designed so that
+the use of wildcards in subsequent processing -- for example,
+bzip2 -dc rec*file.bz2 >
+recovered_data -- lists the files in the correct
+order.
+
+bzip2recover should be of
+most use dealing with large .bz2
+files, as these will contain many blocks.  It is clearly futile
+to use it on damaged single-block files, since a damaged block
+cannot be recovered.  If you wish to minimise any potential data
+loss through media or transmission errors, you might consider
+compressing with a smaller block size.
+
+
+
+
+
+PERFORMANCE NOTES
+
+The sorting phase of compression gathers together similar
+strings in the file.  Because of this, files containing very long
+runs of repeated symbols, like "aabaabaabaab ..."  (repeated
+several hundred times) may compress more slowly than normal.
+Versions 0.9.5 and above fare much better than previous versions
+in this respect.  The ratio between worst-case and average-case
+compression time is in the region of 10:1.  For previous
+versions, this figure was more like 100:1.  You can use the
+-vvvv option to monitor progress
+in great detail, if you want.
+
+Decompression speed is unaffected by these
+phenomena.
+
+bzip2 usually allocates
+several megabytes of memory to operate in, and then charges all
+over it in a fairly random fashion.  This means that performance,
+both for compressing and decompressing, is largely determined by
+the speed at which your machine can service cache misses.
+Because of this, small changes to the code to reduce the miss
+rate have been observed to give disproportionately large
+performance improvements.  I imagine
+bzip2 will perform best on
+machines with very large caches.
+
+
+
+
+
+
+CAVEATS
+
+I/O error messages are not as helpful as they could be.
+bzip2 tries hard to detect I/O
+errors and exit cleanly, but the details of what the problem is
+sometimes seem rather misleading.
+
+This manual page pertains to version &bz-version; of
+bzip2.  Compressed data created by
+this version is entirely forwards and backwards compatible with the
+previous public releases, versions 0.1pl2, 0.9.0 and 0.9.5, 1.0.0,
+1.0.1, 1.0.2 and 1.0.3, but with the following exception: 0.9.0 and
+above can correctly decompress multiple concatenated compressed files.
+0.1pl2 cannot do this; it will stop after decompressing just the first
+file in the stream.
+
+bzip2recover versions
+prior to 1.0.2 used 32-bit integers to represent bit positions in
+compressed files, so it could not handle compressed files more
+than 512 megabytes long.  Versions 1.0.2 and above use 64-bit ints
+on some platforms which support them (GNU supported targets, and
+Windows). To establish whether or not
+bzip2recover was built with such
+a limitation, run it without arguments. In any event you can
+build yourself an unlimited version if you can recompile it with
+MaybeUInt64 set to be an
+unsigned 64-bit integer.
+
+
+
+
+
+
+AUTHOR
+
+Julian Seward,
+&bz-author;
+
+The ideas embodied in
+bzip2 are due to (at least) the
+following people: Michael Burrows and David Wheeler (for the
+block sorting transformation), David Wheeler (again, for the
+Huffman coder), Peter Fenwick (for the structured coding model in
+the original bzip, and many
+refinements), and Alistair Moffat, Radford Neal and Ian Witten
+(for the arithmetic coder in the original
+bzip).  I am much indebted for
+their help, support and advice.  See the manual in the source
+distribution for pointers to sources of documentation.  Christian
+von Roques encouraged me to look for faster sorting algorithms,
+so as to speed up compression.  Bela Lubkin encouraged me to
+improve the worst-case compression performance.  
+Donna Robinson XMLised the documentation.
+Many people sent
+patches, helped with portability problems, lent machines, gave
+advice and were generally helpful.
+
+
+
+
+
+
+
+
+
+Programming with <computeroutput>libbzip2</computeroutput>
+
+
+This chapter describes the programming interface to
+libbzip2.
+
+For general background information, particularly about
+memory use and performance aspects, you'd be well advised to read
+ as well.
+
+
+
+Top-level structure
+
+libbzip2 is a flexible
+library for compressing and decompressing data in the
+bzip2 data format.  Although
+packaged as a single entity, it helps to regard the library as
+three separate parts: the low level interface, and the high level
+interface, and some utility functions.
+
+The structure of
+libbzip2's interfaces is similar
+to that of Jean-loup Gailly's and Mark Adler's excellent
+zlib library.
+
+All externally visible symbols have names beginning
+BZ2_.  This is new in version
+1.0.  The intention is to minimise pollution of the namespaces of
+library clients.
+
+To use any part of the library, you need to
+#include <bzlib.h>
+into your sources.
+
+
+
+
+Low-level summary
+
+This interface provides services for compressing and
+decompressing data in memory.  There's no provision for dealing
+with files, streams or any other I/O mechanisms, just straight
+memory-to-memory work.  In fact, this part of the library can be
+compiled without inclusion of
+stdio.h, which may be helpful
+for embedded applications.
+
+The low-level part of the library has no global variables
+and is therefore thread-safe.
+
+Six routines make up the low level interface:
+BZ2_bzCompressInit,
+BZ2_bzCompress, and
+BZ2_bzCompressEnd for
+compression, and a corresponding trio
+BZ2_bzDecompressInit,
+BZ2_bzDecompress and
+BZ2_bzDecompressEnd for
+decompression.  The *Init
+functions allocate memory for compression/decompression and do
+other initialisations, whilst the
+*End functions close down
+operations and release memory.
+
+The real work is done by
+BZ2_bzCompress and
+BZ2_bzDecompress.  These
+compress and decompress data from a user-supplied input buffer to
+a user-supplied output buffer.  These buffers can be any size;
+arbitrary quantities of data are handled by making repeated calls
+to these functions.  This is a flexible mechanism allowing a
+consumer-pull style of activity, or producer-push, or a mixture
+of both.
+
+
+
+
+
+High-level summary
+
+This interface provides some handy wrappers around the
+low-level interface to facilitate reading and writing
+bzip2 format files
+(.bz2 files).  The routines
+provide hooks to facilitate reading files in which the
+bzip2 data stream is embedded
+within some larger-scale file structure, or where there are
+multiple bzip2 data streams
+concatenated end-to-end.
+
+For reading files,
+BZ2_bzReadOpen,
+BZ2_bzRead,
+BZ2_bzReadClose and 
+BZ2_bzReadGetUnused are
+supplied.  For writing files,
+BZ2_bzWriteOpen,
+BZ2_bzWrite and
+BZ2_bzWriteFinish are
+available.
+
+As with the low-level library, no global variables are used
+so the library is per se thread-safe.  However, if I/O errors
+occur whilst reading or writing the underlying compressed files,
+you may have to consult errno to
+determine the cause of the error.  In that case, you'd need a C
+library which correctly supports
+errno in a multithreaded
+environment.
+
+To make the library a little simpler and more portable,
+BZ2_bzReadOpen and
+BZ2_bzWriteOpen require you to
+pass them file handles (FILE*s)
+which have previously been opened for reading or writing
+respectively.  That avoids portability problems associated with
+file operations and file attributes, whilst not being much of an
+imposition on the programmer.
+
+
+
+
+
+Utility functions summary
+
+For very simple needs,
+BZ2_bzBuffToBuffCompress and
+BZ2_bzBuffToBuffDecompress are
+provided.  These compress data in memory from one buffer to
+another buffer in a single function call.  You should assess
+whether these functions fulfill your memory-to-memory
+compression/decompression requirements before investing effort in
+understanding the more general but more complex low-level
+interface.
+
+Yoshioka Tsuneo
+(tsuneo@rr.iij4u.or.jp) has
+contributed some functions to give better
+zlib compatibility.  These
+functions are BZ2_bzopen,
+BZ2_bzread,
+BZ2_bzwrite,
+BZ2_bzflush,
+BZ2_bzclose,
+BZ2_bzerror and
+BZ2_bzlibVersion.  You may find
+these functions more convenient for simple file reading and
+writing, than those in the high-level interface.  These functions
+are not (yet) officially part of the library, and are minimally
+documented here.  If they break, you get to keep all the pieces.
+I hope to document them properly when time permits.
+
+Yoshioka also contributed modifications to allow the
+library to be built as a Windows DLL.
+
+
+
+
+
+
+
+Error handling
+
+The library is designed to recover cleanly in all
+situations, including the worst-case situation of decompressing
+random data.  I'm not 100% sure that it can always do this, so
+you might want to add a signal handler to catch segmentation
+violations during decompression if you are feeling especially
+paranoid.  I would be interested in hearing more about the
+robustness of the library to corrupted compressed data.
+
+Version 1.0.3 more robust in this respect than any
+previous version.  Investigations with Valgrind (a tool for detecting
+problems with memory management) indicate
+that, at least for the few files I tested, all single-bit errors
+in the decompressed data are caught properly, with no
+segmentation faults, no uses of uninitialised data, no out of
+range reads or writes, and no infinite looping in the decompressor.
+So it's certainly pretty robust, although
+I wouldn't claim it to be totally bombproof.
+
+The file bzlib.h contains
+all definitions needed to use the library.  In particular, you
+should definitely not include
+bzlib_private.h.
+
+In bzlib.h, the various
+return values are defined.  The following list is not intended as
+an exhaustive description of the circumstances in which a given
+value may be returned -- those descriptions are given later.
+Rather, it is intended to convey the rough meaning of each return
+value.  The first five actions are normal and not intended to
+denote an error situation.
+
+
+
+ 
+  BZ_OK
+  The requested action was completed
+   successfully.
+ 
+
+ 
+  BZ_RUN_OK, BZ_FLUSH_OK,
+    BZ_FINISH_OK
+  In 
+   BZ2_bzCompress, the requested
+   flush/finish/nothing-special action was completed
+   successfully.
+ 
+
+ 
+  BZ_STREAM_END
+  Compression of data was completed, or the
+   logical stream end was detected during
+   decompression.
+ 
+
+
+
+The following return values indicate an error of some
+kind.
+
+
+
+ 
+  BZ_CONFIG_ERROR
+  Indicates that the library has been improperly
+   compiled on your platform -- a major configuration error.
+   Specifically, it means that
+   sizeof(char),
+   sizeof(short) and
+   sizeof(int) are not 1, 2 and
+   4 respectively, as they should be.  Note that the library
+   should still work properly on 64-bit platforms which follow
+   the LP64 programming model -- that is, where
+   sizeof(long) and
+   sizeof(void*) are 8.  Under
+   LP64, sizeof(int) is still 4,
+   so libbzip2, which doesn't
+   use the long type, is
+   OK.
+ 
+
+ 
+  BZ_SEQUENCE_ERROR
+  When using the library, it is important to call
+   the functions in the correct sequence and with data structures
+   (buffers etc) in the correct states.
+   libbzip2 checks as much as it
+   can to ensure this is happening, and returns
+   BZ_SEQUENCE_ERROR if not.
+   Code which complies precisely with the function semantics, as
+   detailed below, should never receive this value; such an event
+   denotes buggy code which you should
+   investigate.
+ 
+
+ 
+  BZ_PARAM_ERROR
+  Returned when a parameter to a function call is
+   out of range or otherwise manifestly incorrect.  As with
+   BZ_SEQUENCE_ERROR, this
+   denotes a bug in the client code.  The distinction between
+   BZ_PARAM_ERROR and
+   BZ_SEQUENCE_ERROR is a bit
+   hazy, but still worth making.
+ 
+
+ 
+  BZ_MEM_ERROR
+  Returned when a request to allocate memory
+   failed.  Note that the quantity of memory needed to decompress
+   a stream cannot be determined until the stream's header has
+   been read.  So
+   BZ2_bzDecompress and
+   BZ2_bzRead may return
+   BZ_MEM_ERROR even though some
+   of the compressed data has been read.  The same is not true
+   for compression; once
+   BZ2_bzCompressInit or
+   BZ2_bzWriteOpen have
+   successfully completed,
+   BZ_MEM_ERROR cannot
+   occur.
+ 
+
+ 
+  BZ_DATA_ERROR
+  Returned when a data integrity error is
+   detected during decompression.  Most importantly, this means
+   when stored and computed CRCs for the data do not match.  This
+   value is also returned upon detection of any other anomaly in
+   the compressed data.
+ 
+
+ 
+  BZ_DATA_ERROR_MAGIC
+  As a special case of
+   BZ_DATA_ERROR, it is
+   sometimes useful to know when the compressed stream does not
+   start with the correct magic bytes ('B' 'Z'
+   'h').
+ 
+
+ 
+  BZ_IO_ERROR
+  Returned by
+   BZ2_bzRead and
+   BZ2_bzWrite when there is an
+   error reading or writing in the compressed file, and by
+   BZ2_bzReadOpen and
+   BZ2_bzWriteOpen for attempts
+   to use a file for which the error indicator (viz,
+   ferror(f)) is set.  On
+   receipt of BZ_IO_ERROR, the
+   caller should consult errno
+   and/or perror to acquire
+   operating-system specific information about the
+   problem.
+ 
+
+ 
+  BZ_UNEXPECTED_EOF
+  Returned by
+   BZ2_bzRead when the
+   compressed file finishes before the logical end of stream is
+   detected.
+ 
+
+ 
+  BZ_OUTBUFF_FULL
+  Returned by
+   BZ2_bzBuffToBuffCompress and
+   BZ2_bzBuffToBuffDecompress to
+   indicate that the output data will not fit into the output
+   buffer provided.
+ 
+
+
+
+
+
+
+
+
+Low-level interface
+
+
+
+BZ2_bzCompressInit
+
+
+typedef struct {
+  char *next_in;
+  unsigned int avail_in;
+  unsigned int total_in_lo32;
+  unsigned int total_in_hi32;
+
+  char *next_out;
+  unsigned int avail_out;
+  unsigned int total_out_lo32;
+  unsigned int total_out_hi32;
+
+  void *state;
+
+  void *(*bzalloc)(void *,int,int);
+  void (*bzfree)(void *,void *);
+  void *opaque;
+} bz_stream;
+
+int BZ2_bzCompressInit ( bz_stream *strm, 
+                         int blockSize100k, 
+                         int verbosity,
+                         int workFactor );
+
+
+Prepares for compression.  The
+bz_stream structure holds all
+data pertaining to the compression activity.  A
+bz_stream structure should be
+allocated and initialised prior to the call.  The fields of
+bz_stream comprise the entirety
+of the user-visible data.  state
+is a pointer to the private data structures required for
+compression.
+
+Custom memory allocators are supported, via fields
+bzalloc,
+bzfree, and
+opaque.  The value
+opaque is passed to as the first
+argument to all calls to bzalloc
+and bzfree, but is otherwise
+ignored by the library.  The call bzalloc (
+opaque, n, m ) is expected to return a pointer
+p to n *
+m bytes of memory, and bzfree (
+opaque, p ) should free that memory.
+
+If you don't want to use a custom memory allocator, set
+bzalloc,
+bzfree and
+opaque to
+NULL, and the library will then
+use the standard malloc /
+free routines.
+
+Before calling
+BZ2_bzCompressInit, fields
+bzalloc,
+bzfree and
+opaque should be filled
+appropriately, as just described.  Upon return, the internal
+state will have been allocated and initialised, and
+total_in_lo32,
+total_in_hi32,
+total_out_lo32 and
+total_out_hi32 will have been
+set to zero.  These four fields are used by the library to inform
+the caller of the total amount of data passed into and out of the
+library, respectively.  You should not try to change them.  As of
+version 1.0, 64-bit counts are maintained, even on 32-bit
+platforms, using the _hi32
+fields to store the upper 32 bits of the count.  So, for example,
+the total amount of data in is (total_in_hi32
+<< 32) + total_in_lo32.
+
+Parameter blockSize100k
+specifies the block size to be used for compression.  It should
+be a value between 1 and 9 inclusive, and the actual block size
+used is 100000 x this figure.  9 gives the best compression but
+takes most memory.
+
+Parameter verbosity should
+be set to a number between 0 and 4 inclusive.  0 is silent, and
+greater numbers give increasingly verbose monitoring/debugging
+output.  If the library has been compiled with
+-DBZ_NO_STDIO, no such output
+will appear for any verbosity setting.
+
+Parameter workFactor
+controls how the compression phase behaves when presented with
+worst case, highly repetitive, input data.  If compression runs
+into difficulties caused by repetitive data, the library switches
+from the standard sorting algorithm to a fallback algorithm.  The
+fallback is slower than the standard algorithm by perhaps a
+factor of three, but always behaves reasonably, no matter how bad
+the input.
+
+Lower values of workFactor
+reduce the amount of effort the standard algorithm will expend
+before resorting to the fallback.  You should set this parameter
+carefully; too low, and many inputs will be handled by the
+fallback algorithm and so compress rather slowly, too high, and
+your average-to-worst case compression times can become very
+large.  The default value of 30 gives reasonable behaviour over a
+wide range of circumstances.
+
+Allowable values range from 0 to 250 inclusive.  0 is a
+special case, equivalent to using the default value of 30.
+
+Note that the compressed output generated is the same
+regardless of whether or not the fallback algorithm is
+used.
+
+Be aware also that this parameter may disappear entirely in
+future versions of the library.  In principle it should be
+possible to devise a good way to automatically choose which
+algorithm to use.  Such a mechanism would render the parameter
+obsolete.
+
+Possible return values:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if strm is NULL 
+  or blockSize < 1 or blockSize > 9
+  or verbosity < 0 or verbosity > 4
+  or workFactor < 0 or workFactor > 250
+BZ_MEM_ERROR 
+  if not enough memory is available
+BZ_OK 
+  otherwise
+
+
+Allowable next actions:
+
+
+BZ2_bzCompress
+  if BZ_OK is returned
+  no specific action needed in case of error
+
+
+
+
+
+
+BZ2_bzCompress
+
+
+int BZ2_bzCompress ( bz_stream *strm, int action );
+
+
+Provides more input and/or output buffer space for the
+library.  The caller maintains input and output buffers, and
+calls BZ2_bzCompress to transfer
+data between them.
+
+Before each call to
+BZ2_bzCompress,
+next_in should point at the data
+to be compressed, and avail_in
+should indicate how many bytes the library may read.
+BZ2_bzCompress updates
+next_in,
+avail_in and
+total_in to reflect the number
+of bytes it has read.
+
+Similarly, next_out should
+point to a buffer in which the compressed data is to be placed,
+with avail_out indicating how
+much output space is available.
+BZ2_bzCompress updates
+next_out,
+avail_out and
+total_out to reflect the number
+of bytes output.
+
+You may provide and remove as little or as much data as you
+like on each call of
+BZ2_bzCompress.  In the limit,
+it is acceptable to supply and remove data one byte at a time,
+although this would be terribly inefficient.  You should always
+ensure that at least one byte of output space is available at
+each call.
+
+A second purpose of
+BZ2_bzCompress is to request a
+change of mode of the compressed stream.
+
+Conceptually, a compressed stream can be in one of four
+states: IDLE, RUNNING, FLUSHING and FINISHING.  Before
+initialisation
+(BZ2_bzCompressInit) and after
+termination (BZ2_bzCompressEnd),
+a stream is regarded as IDLE.
+
+Upon initialisation
+(BZ2_bzCompressInit), the stream
+is placed in the RUNNING state.  Subsequent calls to
+BZ2_bzCompress should pass
+BZ_RUN as the requested action;
+other actions are illegal and will result in
+BZ_SEQUENCE_ERROR.
+
+At some point, the calling program will have provided all
+the input data it wants to.  It will then want to finish up -- in
+effect, asking the library to process any data it might have
+buffered internally.  In this state,
+BZ2_bzCompress will no longer
+attempt to read data from
+next_in, but it will want to
+write data to next_out.  Because
+the output buffer supplied by the user can be arbitrarily small,
+the finishing-up operation cannot necessarily be done with a
+single call of
+BZ2_bzCompress.
+
+Instead, the calling program passes
+BZ_FINISH as an action to
+BZ2_bzCompress.  This changes
+the stream's state to FINISHING.  Any remaining input (ie,
+next_in[0 .. avail_in-1]) is
+compressed and transferred to the output buffer.  To do this,
+BZ2_bzCompress must be called
+repeatedly until all the output has been consumed.  At that
+point, BZ2_bzCompress returns
+BZ_STREAM_END, and the stream's
+state is set back to IDLE.
+BZ2_bzCompressEnd should then be
+called.
+
+Just to make sure the calling program does not cheat, the
+library makes a note of avail_in
+at the time of the first call to
+BZ2_bzCompress which has
+BZ_FINISH as an action (ie, at
+the time the program has announced its intention to not supply
+any more input).  By comparing this value with that of
+avail_in over subsequent calls
+to BZ2_bzCompress, the library
+can detect any attempts to slip in more data to compress.  Any
+calls for which this is detected will return
+BZ_SEQUENCE_ERROR.  This
+indicates a programming mistake which should be corrected.
+
+Instead of asking to finish, the calling program may ask
+BZ2_bzCompress to take all the
+remaining input, compress it and terminate the current
+(Burrows-Wheeler) compression block.  This could be useful for
+error control purposes.  The mechanism is analogous to that for
+finishing: call BZ2_bzCompress
+with an action of BZ_FLUSH,
+remove output data, and persist with the
+BZ_FLUSH action until the value
+BZ_RUN is returned.  As with
+finishing, BZ2_bzCompress
+detects any attempt to provide more input data once the flush has
+begun.
+
+Once the flush is complete, the stream returns to the
+normal RUNNING state.
+
+This all sounds pretty complex, but isn't really.  Here's a
+table which shows which actions are allowable in each state, what
+action will be taken, what the next state is, and what the
+non-error return values are.  Note that you can't explicitly ask
+what state the stream is in, but nor do you need to -- it can be
+inferred from the values returned by
+BZ2_bzCompress.
+
+
+IDLE/any
+  Illegal.  IDLE state only exists after BZ2_bzCompressEnd or
+  before BZ2_bzCompressInit.
+  Return value = BZ_SEQUENCE_ERROR
+
+RUNNING/BZ_RUN
+  Compress from next_in to next_out as much as possible.
+  Next state = RUNNING
+  Return value = BZ_RUN_OK
+
+RUNNING/BZ_FLUSH
+  Remember current value of next_in. Compress from next_in
+  to next_out as much as possible, but do not accept any more input.
+  Next state = FLUSHING
+  Return value = BZ_FLUSH_OK
+
+RUNNING/BZ_FINISH
+  Remember current value of next_in. Compress from next_in
+  to next_out as much as possible, but do not accept any more input.
+  Next state = FINISHING
+  Return value = BZ_FINISH_OK
+
+FLUSHING/BZ_FLUSH
+  Compress from next_in to next_out as much as possible, 
+  but do not accept any more input.
+  If all the existing input has been used up and all compressed
+  output has been removed
+    Next state = RUNNING; Return value = BZ_RUN_OK
+  else
+    Next state = FLUSHING; Return value = BZ_FLUSH_OK
+
+FLUSHING/other     
+  Illegal.
+  Return value = BZ_SEQUENCE_ERROR
+
+FINISHING/BZ_FINISH
+  Compress from next_in to next_out as much as possible,
+  but to not accept any more input.  
+  If all the existing input has been used up and all compressed
+  output has been removed
+    Next state = IDLE; Return value = BZ_STREAM_END
+  else
+    Next state = FINISHING; Return value = BZ_FINISH_OK
+
+FINISHING/other
+  Illegal.
+  Return value = BZ_SEQUENCE_ERROR
+
+
+
+That still looks complicated?  Well, fair enough.  The
+usual sequence of calls for compressing a load of data is:
+
+
+
+ Get started with
+  BZ2_bzCompressInit.
+
+ Shovel data in and shlurp out its compressed form
+  using zero or more calls of
+  BZ2_bzCompress with action =
+  BZ_RUN.
+
+ Finish up. Repeatedly call
+  BZ2_bzCompress with action =
+  BZ_FINISH, copying out the
+  compressed output, until
+  BZ_STREAM_END is
+  returned. Close up and go home.  Call
+  BZ2_bzCompressEnd.
+
+
+
+If the data you want to compress fits into your input
+buffer all at once, you can skip the calls of
+BZ2_bzCompress ( ..., BZ_RUN )
+and just do the BZ2_bzCompress ( ..., BZ_FINISH
+) calls.
+
+All required memory is allocated by
+BZ2_bzCompressInit.  The
+compression library can accept any data at all (obviously).  So
+you shouldn't get any error return values from the
+BZ2_bzCompress calls.  If you
+do, they will be
+BZ_SEQUENCE_ERROR, and indicate
+a bug in your programming.
+
+Trivial other possible return values:
+
+
+BZ_PARAM_ERROR
+  if strm is NULL, or strm->s is NULL
+
+
+
+
+
+
+BZ2_bzCompressEnd
+
+
+int BZ2_bzCompressEnd ( bz_stream *strm );
+
+
+Releases all memory associated with a compression
+stream.
+
+Possible return values:
+
+
+BZ_PARAM_ERROR  if strm is NULL or strm->s is NULL
+BZ_OK           otherwise
+
+
+
+
+
+
+BZ2_bzDecompressInit
+
+
+int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small );
+
+
+Prepares for decompression.  As with
+BZ2_bzCompressInit, a
+bz_stream record should be
+allocated and initialised before the call.  Fields
+bzalloc,
+bzfree and
+opaque should be set if a custom
+memory allocator is required, or made
+NULL for the normal
+malloc /
+free routines.  Upon return, the
+internal state will have been initialised, and
+total_in and
+total_out will be zero.
+
+For the meaning of parameter
+verbosity, see
+BZ2_bzCompressInit.
+
+If small is nonzero, the
+library will use an alternative decompression algorithm which
+uses less memory but at the cost of decompressing more slowly
+(roughly speaking, half the speed, but the maximum memory
+requirement drops to around 2300k).  See 
+for more information on memory management.
+
+Note that the amount of memory needed to decompress a
+stream cannot be determined until the stream's header has been
+read, so even if
+BZ2_bzDecompressInit succeeds, a
+subsequent BZ2_bzDecompress
+could fail with
+BZ_MEM_ERROR.
+
+Possible return values:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if ( small != 0 && small != 1 )
+  or (verbosity <; 0 || verbosity > 4)
+BZ_MEM_ERROR
+  if insufficient memory is available
+
+
+Allowable next actions:
+
+
+BZ2_bzDecompress
+  if BZ_OK was returned
+  no specific action required in case of error
+
+
+
+
+
+
+BZ2_bzDecompress
+
+
+int BZ2_bzDecompress ( bz_stream *strm );
+
+
+Provides more input and/out output buffer space for the
+library.  The caller maintains input and output buffers, and uses
+BZ2_bzDecompress to transfer
+data between them.
+
+Before each call to
+BZ2_bzDecompress,
+next_in should point at the
+compressed data, and avail_in
+should indicate how many bytes the library may read.
+BZ2_bzDecompress updates
+next_in,
+avail_in and
+total_in to reflect the number
+of bytes it has read.
+
+Similarly, next_out should
+point to a buffer in which the uncompressed output is to be
+placed, with avail_out
+indicating how much output space is available.
+BZ2_bzCompress updates
+next_out,
+avail_out and
+total_out to reflect the number
+of bytes output.
+
+You may provide and remove as little or as much data as you
+like on each call of
+BZ2_bzDecompress.  In the limit,
+it is acceptable to supply and remove data one byte at a time,
+although this would be terribly inefficient.  You should always
+ensure that at least one byte of output space is available at
+each call.
+
+Use of BZ2_bzDecompress is
+simpler than
+BZ2_bzCompress.
+
+You should provide input and remove output as described
+above, and repeatedly call
+BZ2_bzDecompress until
+BZ_STREAM_END is returned.
+Appearance of BZ_STREAM_END
+denotes that BZ2_bzDecompress
+has detected the logical end of the compressed stream.
+BZ2_bzDecompress will not
+produce BZ_STREAM_END until all
+output data has been placed into the output buffer, so once
+BZ_STREAM_END appears, you are
+guaranteed to have available all the decompressed output, and
+BZ2_bzDecompressEnd can safely
+be called.
+
+If case of an error return value, you should call
+BZ2_bzDecompressEnd to clean up
+and release memory.
+
+Possible return values:
+
+
+BZ_PARAM_ERROR
+  if strm is NULL or strm->s is NULL
+  or strm->avail_out < 1
+BZ_DATA_ERROR
+  if a data integrity error is detected in the compressed stream
+BZ_DATA_ERROR_MAGIC
+  if the compressed stream doesn't begin with the right magic bytes
+BZ_MEM_ERROR
+  if there wasn't enough memory available
+BZ_STREAM_END
+  if the logical end of the data stream was detected and all
+  output in has been consumed, eg s-->avail_out > 0
+BZ_SEQUENCE_ERROR
+  if called after an earlier call already returned BZ_STREAM_END
+BZ_OK
+  otherwise
+
+
+Allowable next actions:
+
+
+BZ2_bzDecompress
+  if BZ_OK was returned
+BZ2_bzDecompressEnd
+  otherwise
+
+
+
+
+
+
+BZ2_bzDecompressEnd
+
+
+int BZ2_bzDecompressEnd ( bz_stream *strm );
+
+
+Releases all memory associated with a decompression
+stream.
+
+Possible return values:
+
+
+BZ_PARAM_ERROR
+  if strm is NULL or strm->s is NULL
+BZ_OK
+  otherwise
+
+
+Allowable next actions:
+
+
+  None.
+
+
+
+
+
+
+
+
+High-level interface
+
+This interface provides functions for reading and writing
+bzip2 format files.  First, some
+general points.
+
+
+
+ All of the functions take an
+  int* first argument,
+  bzerror.  After each call,
+  bzerror should be consulted
+  first to determine the outcome of the call.  If
+  bzerror is
+  BZ_OK, the call completed
+  successfully, and only then should the return value of the
+  function (if any) be consulted.  If
+  bzerror is
+  BZ_IO_ERROR, there was an
+  error reading/writing the underlying compressed file, and you
+  should then consult errno /
+  perror to determine the cause
+  of the difficulty.  bzerror
+  may also be set to various other values; precise details are
+  given on a per-function basis below.
+
+ If bzerror indicates
+  an error (ie, anything except
+  BZ_OK and
+  BZ_STREAM_END), you should
+  immediately call
+  BZ2_bzReadClose (or
+  BZ2_bzWriteClose, depending on
+  whether you are attempting to read or to write) to free up all
+  resources associated with the stream.  Once an error has been
+  indicated, behaviour of all calls except
+  BZ2_bzReadClose
+  (BZ2_bzWriteClose) is
+  undefined.  The implication is that (1)
+  bzerror should be checked
+  after each call, and (2) if
+  bzerror indicates an error,
+  BZ2_bzReadClose
+  (BZ2_bzWriteClose) should then
+  be called to clean up.
+
+ The FILE* arguments
+  passed to BZ2_bzReadOpen /
+  BZ2_bzWriteOpen should be set
+  to binary mode.  Most Unix systems will do this by default, but
+  other platforms, including Windows and Mac, will not.  If you
+  omit this, you may encounter problems when moving code to new
+  platforms.
+
+ Memory allocation requests are handled by
+  malloc /
+  free.  At present there is no
+  facility for user-defined memory allocators in the file I/O
+  functions (could easily be added, though).
+
+
+
+
+
+
+BZ2_bzReadOpen
+
+
+typedef void BZFILE;
+
+BZFILE *BZ2_bzReadOpen( int *bzerror, FILE *f, 
+                        int verbosity, int small,
+                        void *unused, int nUnused );
+
+
+Prepare to read compressed data from file handle
+f.
+f should refer to a file which
+has been opened for reading, and for which the error indicator
+(ferror(f))is not set.  If
+small is 1, the library will try
+to decompress using less memory, at the expense of speed.
+
+For reasons explained below,
+BZ2_bzRead will decompress the
+nUnused bytes starting at
+unused, before starting to read
+from the file f.  At most
+BZ_MAX_UNUSED bytes may be
+supplied like this.  If this facility is not required, you should
+pass NULL and
+0 for
+unused and
+nUnused respectively.
+
+For the meaning of parameters
+small and
+verbosity, see
+BZ2_bzDecompressInit.
+
+The amount of memory needed to decompress a file cannot be
+determined until the file's header has been read.  So it is
+possible that BZ2_bzReadOpen
+returns BZ_OK but a subsequent
+call of BZ2_bzRead will return
+BZ_MEM_ERROR.
+
+Possible assignments to
+bzerror:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if f is NULL
+  or small is neither 0 nor 1
+  or ( unused == NULL && nUnused != 0 )
+  or ( unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED) )
+BZ_IO_ERROR
+  if ferror(f) is nonzero
+BZ_MEM_ERROR
+  if insufficient memory is available
+BZ_OK
+  otherwise.
+
+
+Possible return values:
+
+
+Pointer to an abstract BZFILE
+  if bzerror is BZ_OK
+NULL
+  otherwise
+
+
+Allowable next actions:
+
+
+BZ2_bzRead
+  if bzerror is BZ_OK
+BZ2_bzClose
+  otherwise
+
+
+
+
+
+
+BZ2_bzRead
+
+
+int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len );
+
+
+Reads up to len
+(uncompressed) bytes from the compressed file
+b into the buffer
+buf.  If the read was
+successful, bzerror is set to
+BZ_OK and the number of bytes
+read is returned.  If the logical end-of-stream was detected,
+bzerror will be set to
+BZ_STREAM_END, and the number of
+bytes read is returned.  All other
+bzerror values denote an
+error.
+
+BZ2_bzRead will supply
+len bytes, unless the logical
+stream end is detected or an error occurs.  Because of this, it
+is possible to detect the stream end by observing when the number
+of bytes returned is less than the number requested.
+Nevertheless, this is regarded as inadvisable; you should instead
+check bzerror after every call
+and watch out for
+BZ_STREAM_END.
+
+Internally, BZ2_bzRead
+copies data from the compressed file in chunks of size
+BZ_MAX_UNUSED bytes before
+decompressing it.  If the file contains more bytes than strictly
+needed to reach the logical end-of-stream,
+BZ2_bzRead will almost certainly
+read some of the trailing data before signalling
+BZ_SEQUENCE_END.  To collect the
+read but unused data once
+BZ_SEQUENCE_END has appeared,
+call BZ2_bzReadGetUnused
+immediately before
+BZ2_bzReadClose.
+
+Possible assignments to
+bzerror:
+
+
+BZ_PARAM_ERROR
+  if b is NULL or buf is NULL or len < 0
+BZ_SEQUENCE_ERROR
+  if b was opened with BZ2_bzWriteOpen
+BZ_IO_ERROR
+  if there is an error reading from the compressed file
+BZ_UNEXPECTED_EOF
+  if the compressed file ended before 
+  the logical end-of-stream was detected
+BZ_DATA_ERROR
+  if a data integrity error was detected in the compressed stream
+BZ_DATA_ERROR_MAGIC
+  if the stream does not begin with the requisite header bytes 
+  (ie, is not a bzip2 data file).  This is really 
+  a special case of BZ_DATA_ERROR.
+BZ_MEM_ERROR
+  if insufficient memory was available
+BZ_STREAM_END
+  if the logical end of stream was detected.
+BZ_OK
+  otherwise.
+
+
+Possible return values:
+
+
+number of bytes read
+  if bzerror is BZ_OK or BZ_STREAM_END
+undefined
+  otherwise
+
+
+Allowable next actions:
+
+
+collect data from buf, then BZ2_bzRead or BZ2_bzReadClose
+  if bzerror is BZ_OK
+collect data from buf, then BZ2_bzReadClose or BZ2_bzReadGetUnused
+  if bzerror is BZ_SEQUENCE_END
+BZ2_bzReadClose
+  otherwise
+
+
+
+
+
+
+BZ2_bzReadGetUnused
+
+
+void BZ2_bzReadGetUnused( int* bzerror, BZFILE *b, 
+                          void** unused, int* nUnused );
+
+
+Returns data which was read from the compressed file but
+was not needed to get to the logical end-of-stream.
+*unused is set to the address of
+the data, and *nUnused to the
+number of bytes.  *nUnused will
+be set to a value between 0 and
+BZ_MAX_UNUSED inclusive.
+
+This function may only be called once
+BZ2_bzRead has signalled
+BZ_STREAM_END but before
+BZ2_bzReadClose.
+
+Possible assignments to
+bzerror:
+
+
+BZ_PARAM_ERROR
+  if b is NULL
+  or unused is NULL or nUnused is NULL
+BZ_SEQUENCE_ERROR
+  if BZ_STREAM_END has not been signalled
+  or if b was opened with BZ2_bzWriteOpen
+BZ_OK
+  otherwise
+
+
+Allowable next actions:
+
+
+BZ2_bzReadClose
+
+
+
+
+
+
+BZ2_bzReadClose
+
+
+void BZ2_bzReadClose ( int *bzerror, BZFILE *b );
+
+
+Releases all memory pertaining to the compressed file
+b.
+BZ2_bzReadClose does not call
+fclose on the underlying file
+handle, so you should do that yourself if appropriate.
+BZ2_bzReadClose should be called
+to clean up after all error situations.
+
+Possible assignments to
+bzerror:
+
+
+BZ_SEQUENCE_ERROR
+  if b was opened with BZ2_bzOpenWrite
+BZ_OK
+  otherwise
+
+
+Allowable next actions:
+
+
+none
+
+
+
+
+
+
+BZ2_bzWriteOpen
+
+
+BZFILE *BZ2_bzWriteOpen( int *bzerror, FILE *f, 
+                         int blockSize100k, int verbosity,
+                         int workFactor );
+
+
+Prepare to write compressed data to file handle
+f.
+f should refer to a file which
+has been opened for writing, and for which the error indicator
+(ferror(f))is not set.
+
+For the meaning of parameters
+blockSize100k,
+verbosity and
+workFactor, see
+BZ2_bzCompressInit.
+
+All required memory is allocated at this stage, so if the
+call completes successfully,
+BZ_MEM_ERROR cannot be signalled
+by a subsequent call to
+BZ2_bzWrite.
+
+Possible assignments to
+bzerror:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if f is NULL
+  or blockSize100k < 1 or blockSize100k > 9
+BZ_IO_ERROR
+  if ferror(f) is nonzero
+BZ_MEM_ERROR
+  if insufficient memory is available
+BZ_OK
+  otherwise
+
+
+Possible return values:
+
+
+Pointer to an abstract BZFILE
+  if bzerror is BZ_OK
+NULL
+  otherwise
+
+
+Allowable next actions:
+
+
+BZ2_bzWrite
+  if bzerror is BZ_OK
+  (you could go directly to BZ2_bzWriteClose, but this would be pretty pointless)
+BZ2_bzWriteClose
+  otherwise
+
+
+
+
+
+
+BZ2_bzWrite
+
+
+void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len );
+
+
+Absorbs len bytes from the
+buffer buf, eventually to be
+compressed and written to the file.
+
+Possible assignments to
+bzerror:
+
+
+BZ_PARAM_ERROR
+  if b is NULL or buf is NULL or len < 0
+BZ_SEQUENCE_ERROR
+  if b was opened with BZ2_bzReadOpen
+BZ_IO_ERROR
+  if there is an error writing the compressed file.
+BZ_OK
+  otherwise
+
+
+
+
+
+
+BZ2_bzWriteClose
+
+
+void BZ2_bzWriteClose( int *bzerror, BZFILE* f,
+                       int abandon,
+                       unsigned int* nbytes_in,
+                       unsigned int* nbytes_out );
+
+void BZ2_bzWriteClose64( int *bzerror, BZFILE* f,
+                         int abandon,
+                         unsigned int* nbytes_in_lo32,
+                         unsigned int* nbytes_in_hi32,
+                         unsigned int* nbytes_out_lo32,
+                         unsigned int* nbytes_out_hi32 );
+
+
+Compresses and flushes to the compressed file all data so
+far supplied by BZ2_bzWrite.
+The logical end-of-stream markers are also written, so subsequent
+calls to BZ2_bzWrite are
+illegal.  All memory associated with the compressed file
+b is released.
+fflush is called on the
+compressed file, but it is not
+fclose'd.
+
+If BZ2_bzWriteClose is
+called to clean up after an error, the only action is to release
+the memory.  The library records the error codes issued by
+previous calls, so this situation will be detected automatically.
+There is no attempt to complete the compression operation, nor to
+fflush the compressed file.  You
+can force this behaviour to happen even in the case of no error,
+by passing a nonzero value to
+abandon.
+
+If nbytes_in is non-null,
+*nbytes_in will be set to be the
+total volume of uncompressed data handled.  Similarly,
+nbytes_out will be set to the
+total volume of compressed data written.  For compatibility with
+older versions of the library,
+BZ2_bzWriteClose only yields the
+lower 32 bits of these counts.  Use
+BZ2_bzWriteClose64 if you want
+the full 64 bit counts.  These two functions are otherwise
+absolutely identical.
+
+Possible assignments to
+bzerror:
+
+
+BZ_SEQUENCE_ERROR
+  if b was opened with BZ2_bzReadOpen
+BZ_IO_ERROR
+  if there is an error writing the compressed file
+BZ_OK
+  otherwise
+
+
+
+
+
+
+Handling embedded compressed data streams
+
+The high-level library facilitates use of
+bzip2 data streams which form
+some part of a surrounding, larger data stream.
+
+
+
+ For writing, the library takes an open file handle,
+  writes compressed data to it,
+  fflushes it but does not
+  fclose it.  The calling
+  application can write its own data before and after the
+  compressed data stream, using that same file handle.
+
+ Reading is more complex, and the facilities are not as
+  general as they could be since generality is hard to reconcile
+  with efficiency.  BZ2_bzRead
+  reads from the compressed file in blocks of size
+  BZ_MAX_UNUSED bytes, and in
+  doing so probably will overshoot the logical end of compressed
+  stream.  To recover this data once decompression has ended,
+  call BZ2_bzReadGetUnused after
+  the last call of BZ2_bzRead
+  (the one returning
+  BZ_STREAM_END) but before
+  calling
+  BZ2_bzReadClose.
+
+
+
+This mechanism makes it easy to decompress multiple
+bzip2 streams placed end-to-end.
+As the end of one stream, when
+BZ2_bzRead returns
+BZ_STREAM_END, call
+BZ2_bzReadGetUnused to collect
+the unused data (copy it into your own buffer somewhere).  That
+data forms the start of the next compressed stream.  To start
+uncompressing that next stream, call
+BZ2_bzReadOpen again, feeding in
+the unused data via the unused /
+nUnused parameters.  Keep doing
+this until BZ_STREAM_END return
+coincides with the physical end of file
+(feof(f)).  In this situation
+BZ2_bzReadGetUnused will of
+course return no data.
+
+This should give some feel for how the high-level interface
+can be used.  If you require extra flexibility, you'll have to
+bite the bullet and get to grips with the low-level
+interface.
+
+
+
+
+
+Standard file-reading/writing code
+
+Here's how you'd write data to a compressed file:
+
+
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "w" );
+if ( !f ) {
+ /* handle error */
+}
+b = BZ2_bzWriteOpen( &bzerror, f, 9 );
+if (bzerror != BZ_OK) {
+ BZ2_bzWriteClose ( b );
+ /* handle error */
+}
+
+while ( /* condition */ ) {
+ /* get data to write into buf, and set nBuf appropriately */
+ nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf );
+ if (bzerror == BZ_IO_ERROR) { 
+   BZ2_bzWriteClose ( &bzerror, b );
+   /* handle error */
+ }
+}
+
+BZ2_bzWriteClose( &bzerror, b );
+if (bzerror == BZ_IO_ERROR) {
+ /* handle error */
+}
+
+
+And to read from a compressed file:
+
+
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "r" );
+if ( !f ) {
+  /* handle error */
+}
+b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 );
+if ( bzerror != BZ_OK ) {
+  BZ2_bzReadClose ( &bzerror, b );
+  /* handle error */
+}
+
+bzerror = BZ_OK;
+while ( bzerror == BZ_OK && /* arbitrary other conditions */) {
+  nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ );
+  if ( bzerror == BZ_OK ) {
+    /* do something with buf[0 .. nBuf-1] */
+  }
+}
+if ( bzerror != BZ_STREAM_END ) {
+   BZ2_bzReadClose ( &bzerror, b );
+   /* handle error */
+} else {
+   BZ2_bzReadClose ( &bzerror, b );
+}
+
+
+
+
+
+
+
+
+Utility functions
+
+
+
+BZ2_bzBuffToBuffCompress
+
+
+int BZ2_bzBuffToBuffCompress( char*         dest,
+                              unsigned int* destLen,
+                              char*         source,
+                              unsigned int  sourceLen,
+                              int           blockSize100k,
+                              int           verbosity,
+                              int           workFactor );
+
+
+Attempts to compress the data in source[0
+.. sourceLen-1] into the destination buffer,
+dest[0 .. *destLen-1].  If the
+destination buffer is big enough,
+*destLen is set to the size of
+the compressed data, and BZ_OK
+is returned.  If the compressed data won't fit,
+*destLen is unchanged, and
+BZ_OUTBUFF_FULL is
+returned.
+
+Compression in this manner is a one-shot event, done with a
+single call to this function.  The resulting compressed data is a
+complete bzip2 format data
+stream.  There is no mechanism for making additional calls to
+provide extra input data.  If you want that kind of mechanism,
+use the low-level interface.
+
+For the meaning of parameters
+blockSize100k,
+verbosity and
+workFactor, see
+BZ2_bzCompressInit.
+
+To guarantee that the compressed data will fit in its
+buffer, allocate an output buffer of size 1% larger than the
+uncompressed data, plus six hundred extra bytes.
+
+BZ2_bzBuffToBuffDecompress
+will not write data at or beyond
+dest[*destLen], even in case of
+buffer overflow.
+
+Possible return values:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if dest is NULL or destLen is NULL
+  or blockSize100k < 1 or blockSize100k > 9
+  or verbosity < 0 or verbosity > 4
+  or workFactor < 0 or workFactor > 250
+BZ_MEM_ERROR
+  if insufficient memory is available 
+BZ_OUTBUFF_FULL
+  if the size of the compressed data exceeds *destLen
+BZ_OK
+  otherwise
+
+
+
+
+
+
+BZ2_bzBuffToBuffDecompress
+
+
+int BZ2_bzBuffToBuffDecompress( char*         dest,
+                                unsigned int* destLen,
+                                char*         source,
+                                unsigned int  sourceLen,
+                                int           small,
+                                int           verbosity );
+
+
+Attempts to decompress the data in source[0
+.. sourceLen-1] into the destination buffer,
+dest[0 .. *destLen-1].  If the
+destination buffer is big enough,
+*destLen is set to the size of
+the uncompressed data, and BZ_OK
+is returned.  If the compressed data won't fit,
+*destLen is unchanged, and
+BZ_OUTBUFF_FULL is
+returned.
+
+source is assumed to hold
+a complete bzip2 format data
+stream.
+BZ2_bzBuffToBuffDecompress tries
+to decompress the entirety of the stream into the output
+buffer.
+
+For the meaning of parameters
+small and
+verbosity, see
+BZ2_bzDecompressInit.
+
+Because the compression ratio of the compressed data cannot
+be known in advance, there is no easy way to guarantee that the
+output buffer will be big enough.  You may of course make
+arrangements in your code to record the size of the uncompressed
+data, but such a mechanism is beyond the scope of this
+library.
+
+BZ2_bzBuffToBuffDecompress
+will not write data at or beyond
+dest[*destLen], even in case of
+buffer overflow.
+
+Possible return values:
+
+
+BZ_CONFIG_ERROR
+  if the library has been mis-compiled
+BZ_PARAM_ERROR
+  if dest is NULL or destLen is NULL
+  or small != 0 && small != 1
+  or verbosity < 0 or verbosity > 4
+BZ_MEM_ERROR
+  if insufficient memory is available 
+BZ_OUTBUFF_FULL
+  if the size of the compressed data exceeds *destLen
+BZ_DATA_ERROR
+  if a data integrity error was detected in the compressed data
+BZ_DATA_ERROR_MAGIC
+  if the compressed data doesn't begin with the right magic bytes
+BZ_UNEXPECTED_EOF
+  if the compressed data ends unexpectedly
+BZ_OK
+  otherwise
+
+
+
+
+
+
+
+
+zlib compatibility functions
+
+Yoshioka Tsuneo has contributed some functions to give
+better zlib compatibility.
+These functions are BZ2_bzopen,
+BZ2_bzread,
+BZ2_bzwrite,
+BZ2_bzflush,
+BZ2_bzclose,
+BZ2_bzerror and
+BZ2_bzlibVersion.  These
+functions are not (yet) officially part of the library.  If they
+break, you get to keep all the pieces.  Nevertheless, I think
+they work ok.
+
+
+typedef void BZFILE;
+
+const char * BZ2_bzlibVersion ( void );
+
+
+Returns a string indicating the library version.
+
+
+BZFILE * BZ2_bzopen  ( const char *path, const char *mode );
+BZFILE * BZ2_bzdopen ( int        fd,    const char *mode );
+
+
+Opens a .bz2 file for
+reading or writing, using either its name or a pre-existing file
+descriptor.  Analogous to fopen
+and fdopen.
+
+
+int BZ2_bzread  ( BZFILE* b, void* buf, int len );
+int BZ2_bzwrite ( BZFILE* b, void* buf, int len );
+
+
+Reads/writes data from/to a previously opened
+BZFILE.  Analogous to
+fread and
+fwrite.
+
+
+int  BZ2_bzflush ( BZFILE* b );
+void BZ2_bzclose ( BZFILE* b );
+
+
+Flushes/closes a BZFILE.
+BZ2_bzflush doesn't actually do
+anything.  Analogous to fflush
+and fclose.
+
+
+const char * BZ2_bzerror ( BZFILE *b, int *errnum )
+
+
+Returns a string describing the more recent error status of
+b, and also sets
+*errnum to its numerical
+value.
+
+
+
+
+
+Using the library in a stdio-free environment
+
+
+
+Getting rid of stdio
+
+In a deeply embedded application, you might want to use
+just the memory-to-memory functions.  You can do this
+conveniently by compiling the library with preprocessor symbol
+BZ_NO_STDIO defined.  Doing this
+gives you a library containing only the following eight
+functions:
+
+BZ2_bzCompressInit,
+BZ2_bzCompress,
+BZ2_bzCompressEnd
+BZ2_bzDecompressInit,
+BZ2_bzDecompress,
+BZ2_bzDecompressEnd
+BZ2_bzBuffToBuffCompress,
+BZ2_bzBuffToBuffDecompress
+
+When compiled like this, all functions will ignore
+verbosity settings.
+
+
+
+
+
+Critical error handling
+
+libbzip2 contains a number
+of internal assertion checks which should, needless to say, never
+be activated.  Nevertheless, if an assertion should fail,
+behaviour depends on whether or not the library was compiled with
+BZ_NO_STDIO set.
+
+For a normal compile, an assertion failure yields the
+message:
+
+

+bzip2/libbzip2: internal error number N.
+This is a bug in bzip2/libbzip2, &bz-version; of &bz-date;.
+Please report it to: &bz-email;.  If this happened
+when you were using some program which uses libbzip2 as a
+component, you should also report this bug to the author(s)
+of that program.  Please make an effort to report this bug;
+timely and accurate bug reports eventually lead to higher
+quality software.  Thanks.
+

+
+where N is some error code
+number.  If N == 1007, it also
+prints some extra text advising the reader that unreliable memory
+is often associated with internal error 1007. (This is a
+frequently-observed-phenomenon with versions 1.0.0/1.0.1).
+
+exit(3) is then
+called.
+
+For a stdio-free library,
+assertion failures result in a call to a function declared
+as:
+
+
+extern void bz_internal_error ( int errcode );
+
+
+The relevant code is passed as a parameter.  You should
+supply such a function.
+
+In either case, once an assertion failure has occurred, any
+bz_stream records involved can
+be regarded as invalid.  You should not attempt to resume normal
+operation with them.
+
+You may, of course, change critical error handling to suit
+your needs.  As I said above, critical errors indicate bugs in
+the library and should not occur.  All "normal" error situations
+are indicated via error return codes from functions, and can be
+recovered from.
+
+
+
+
+
+
+
+Making a Windows DLL
+
+Everything related to Windows has been contributed by
+Yoshioka Tsuneo
+(tsuneo@rr.iij4u.or.jp), so
+you should send your queries to him (but please Cc:
+&bz-email;).
+
+My vague understanding of what to do is: using Visual C++
+5.0, open the project file
+libbz2.dsp, and build.  That's
+all.
+
+If you can't open the project file for some reason, make a
+new one, naming these files:
+blocksort.c,
+bzlib.c,
+compress.c,
+crctable.c,
+decompress.c,
+huffman.c,
+randtable.c and
+libbz2.def.  You will also need
+to name the header files bzlib.h
+and bzlib_private.h.
+
+If you don't use VC++, you may need to define the
+proprocessor symbol
+_WIN32.
+
+Finally, dlltest.c is a
+sample program using the DLL.  It has a project file,
+dlltest.dsp.
+
+If you just want a makefile for Visual C, have a look at
+makefile.msc.
+
+Be aware that if you compile
+bzip2 itself on Win32, you must
+set BZ_UNIX to 0 and
+BZ_LCCWIN32 to 1, in the file
+bzip2.c, before compiling.
+Otherwise the resulting binary won't work correctly.
+
+I haven't tried any of this stuff myself, but it all looks
+plausible.
+
+
+
+
+
+
+
+
+Miscellanea
+
+These are just some random thoughts of mine.  Your mileage
+may vary.
+
+
+
+Limitations of the compressed file format
+
+bzip2-1.0.X,
+0.9.5 and
+0.9.0 use exactly the same file
+format as the original version,
+bzip2-0.1.  This decision was
+made in the interests of stability.  Creating yet another
+incompatible compressed file format would create further
+confusion and disruption for users.
+
+Nevertheless, this is not a painless decision.  Development
+work since the release of
+bzip2-0.1 in August 1997 has
+shown complexities in the file format which slow down
+decompression and, in retrospect, are unnecessary.  These
+are:
+
+
+
+ The run-length encoder, which is the first of the
+   compression transformations, is entirely irrelevant.  The
+   original purpose was to protect the sorting algorithm from the
+   very worst case input: a string of repeated symbols.  But
+   algorithm steps Q6a and Q6b in the original Burrows-Wheeler
+   technical report (SRC-124) show how repeats can be handled
+   without difficulty in block sorting.
+
+ The randomisation mechanism doesn't really need to be
+   there.  Udi Manber and Gene Myers published a suffix array
+   construction algorithm a few years back, which can be employed
+   to sort any block, no matter how repetitive, in O(N log N)
+   time.  Subsequent work by Kunihiko Sadakane has produced a
+   derivative O(N (log N)^2) algorithm which usually outperforms
+   the Manber-Myers algorithm.
+
+   I could have changed to Sadakane's algorithm, but I find
+   it to be slower than bzip2's
+   existing algorithm for most inputs, and the randomisation
+   mechanism protects adequately against bad cases.  I didn't
+   think it was a good tradeoff to make.  Partly this is due to
+   the fact that I was not flooded with email complaints about
+   bzip2-0.1's performance on
+   repetitive data, so perhaps it isn't a problem for real
+   inputs.
+
+   Probably the best long-term solution, and the one I have
+   incorporated into 0.9.5 and above, is to use the existing
+   sorting algorithm initially, and fall back to a O(N (log N)^2)
+   algorithm if the standard algorithm gets into
+   difficulties.
+
+  The compressed file format was never designed to be
+   handled by a library, and I have had to jump though some hoops
+   to produce an efficient implementation of decompression.  It's
+   a bit hairy.  Try passing
+   decompress.c through the C
+   preprocessor and you'll see what I mean.  Much of this
+   complexity could have been avoided if the compressed size of
+   each block of data was recorded in the data stream.
+
+ An Adler-32 checksum, rather than a CRC32 checksum,
+   would be faster to compute.
+
+
+
+It would be fair to say that the
+bzip2 format was frozen before I
+properly and fully understood the performance consequences of
+doing so.
+
+Improvements which I was able to incorporate into 0.9.0,
+despite using the same file format, are:
+
+
+
+ Single array implementation of the inverse BWT.  This
+  significantly speeds up decompression, presumably because it
+  reduces the number of cache misses.
+
+ Faster inverse MTF transform for large MTF values.
+  The new implementation is based on the notion of sliding blocks
+  of values.
+
+ bzip2-0.9.0 now reads
+  and writes files with fread
+  and fwrite; version 0.1 used
+  putc and
+  getc.  Duh!  Well, you live
+  and learn.
+
+
+
+Further ahead, it would be nice to be able to do random
+access into files.  This will require some careful design of
+compressed file formats.
+
+
+
+
+
+Portability issues
+
+After some consideration, I have decided not to use GNU
+autoconf to configure 0.9.5 or
+1.0.
+
+autoconf, admirable and
+wonderful though it is, mainly assists with portability problems
+between Unix-like platforms.  But
+bzip2 doesn't have much in the
+way of portability problems on Unix; most of the difficulties
+appear when porting to the Mac, or to Microsoft's operating
+systems.  autoconf doesn't help
+in those cases, and brings in a whole load of new
+complexity.
+
+Most people should be able to compile the library and
+program under Unix straight out-of-the-box, so to speak,
+especially if you have a version of GNU C available.
+
+There are a couple of
+__inline__ directives in the
+code.  GNU C (gcc) should be
+able to handle them.  If you're not using GNU C, your C compiler
+shouldn't see them at all.  If your compiler does, for some
+reason, see them and doesn't like them, just
+#define
+__inline__ to be
+/* */.  One easy way to do this
+is to compile with the flag
+-D__inline__=, which should be
+understood by most Unix compilers.
+
+If you still have difficulties, try compiling with the
+macro BZ_STRICT_ANSI defined.
+This should enable you to build the library in a strictly ANSI
+compliant environment.  Building the program itself like this is
+dangerous and not supported, since you remove
+bzip2's checks against
+compressing directories, symbolic links, devices, and other
+not-really-a-file entities.  This could cause filesystem
+corruption!
+
+One other thing: if you create a
+bzip2 binary for public distribution,
+please consider linking it statically (gcc
+-static).  This avoids all sorts of library-version
+issues that others may encounter later on.
+
+If you build bzip2 on
+Win32, you must set BZ_UNIX to 0
+and BZ_LCCWIN32 to 1, in the
+file bzip2.c, before compiling.
+Otherwise the resulting binary won't work correctly.
+
+
+
+
+
+Reporting bugs
+
+I tried pretty hard to make sure
+bzip2 is bug free, both by
+design and by testing.  Hopefully you'll never need to read this
+section for real.
+
+Nevertheless, if bzip2 dies
+with a segmentation fault, a bus error or an internal assertion
+failure, it will ask you to email me a bug report.  Experience from
+years of feedback of bzip2 users indicates that almost all these
+problems can be traced to either compiler bugs or hardware
+problems.
+
+
+
+ Recompile the program with no optimisation, and
+  see if it works.  And/or try a different compiler.  I heard all
+  sorts of stories about various flavours of GNU C (and other
+  compilers) generating bad code for
+  bzip2, and I've run across two
+  such examples myself.
+
+  2.7.X versions of GNU C are known to generate bad code
+  from time to time, at high optimisation levels.  If you get
+  problems, try using the flags
+  -O2
+  -fomit-frame-pointer
+  -fno-strength-reduce.  You
+  should specifically not use
+  -funroll-loops.
+
+  You may notice that the Makefile runs six tests as part
+  of the build process.  If the program passes all of these, it's
+  a pretty good (but not 100%) indication that the compiler has
+  done its job correctly.
+
+ If bzip2
+  crashes randomly, and the crashes are not repeatable, you may
+  have a flaky memory subsystem.
+  bzip2 really hammers your
+  memory hierarchy, and if it's a bit marginal, you may get these
+  problems.  Ditto if your disk or I/O subsystem is slowly
+  failing.  Yup, this really does happen.
+
+  Try using a different machine of the same type, and see
+  if you can repeat the problem.
+
+  This isn't really a bug, but ... If
+  bzip2 tells you your file is
+  corrupted on decompression, and you obtained the file via FTP,
+  there is a possibility that you forgot to tell FTP to do a
+  binary mode transfer.  That absolutely will cause the file to
+  be non-decompressible.  You'll have to transfer it
+  again.
+
+
+
+If you've incorporated
+libbzip2 into your own program
+and are getting problems, please, please, please, check that the
+parameters you are passing in calls to the library, are correct,
+and in accordance with what the documentation says is allowable.
+I have tried to make the library robust against such problems,
+but I'm sure I haven't succeeded.
+
+Finally, if the above comments don't help, you'll have to
+send me a bug report.  Now, it's just amazing how many people
+will send me a bug report saying something like:
+
+
+bzip2 crashed with segmentation fault on my machine
+
+
+and absolutely nothing else.  Needless to say, a such a
+report is totally, utterly, completely and
+comprehensively 100% useless; a waste of your time, my time, and
+net bandwidth.  With no details at all, there's no way
+I can possibly begin to figure out what the problem is.
+
+The rules of the game are: facts, facts, facts.  Don't omit
+them because "oh, they won't be relevant".  At the bare
+minimum:
+
+
+Machine type.  Operating system version.  
+Exact version of bzip2 (do bzip2 -V).  
+Exact version of the compiler used.  
+Flags passed to the compiler.
+
+
+However, the most important single thing that will help me
+is the file that you were trying to compress or decompress at the
+time the problem happened.  Without that, my ability to do
+anything more than speculate about the cause, is limited.
+
+
+
+
+
+Did you get the right package?
+
+bzip2 is a resource hog.
+It soaks up large amounts of CPU cycles and memory.  Also, it
+gives very large latencies.  In the worst case, you can feed many
+megabytes of uncompressed data into the library before getting
+any compressed output, so this probably rules out applications
+requiring interactive behaviour.
+
+These aren't faults of my implementation, I hope, but more
+an intrinsic property of the Burrows-Wheeler transform
+(unfortunately).  Maybe this isn't what you want.
+
+If you want a compressor and/or library which is faster,
+uses less memory but gets pretty good compression, and has
+minimal latency, consider Jean-loup Gailly's and Mark Adler's
+work, zlib-1.2.1 and
+gzip-1.2.4.  Look for them at 
+http://www.zlib.org and 
+http://www.gzip.org
+respectively.
+
+For something faster and lighter still, you might try Markus F
+X J Oberhumer's LZO real-time
+compression/decompression library, at 
+http://www.oberhumer.com/opensource.
+
+
+
+
+
+
+Further Reading
+
+bzip2 is not research
+work, in the sense that it doesn't present any new ideas.
+Rather, it's an engineering exercise based on existing
+ideas.
+
+Four documents describe essentially all the ideas behind
+bzip2:
+
+Michael Burrows and D. J. Wheeler:
+  "A block-sorting lossless data compression algorithm"
+   10th May 1994. 
+   Digital SRC Research Report 124.
+   ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz
+   If you have trouble finding it, try searching at the
+   New Zealand Digital Library, http://www.nzdl.org.
+
+Daniel S. Hirschberg and Debra A. LeLewer
+  "Efficient Decoding of Prefix Codes"
+   Communications of the ACM, April 1990, Vol 33, Number 4.
+   You might be able to get an electronic copy of this
+   from the ACM Digital Library.
+
+David J. Wheeler
+   Program bred3.c and accompanying document bred3.ps.
+   This contains the idea behind the multi-table Huffman coding scheme.
+   ftp://ftp.cl.cam.ac.uk/users/djw3/
+
+Jon L. Bentley and Robert Sedgewick
+  "Fast Algorithms for Sorting and Searching Strings"
+   Available from Sedgewick's web page,
+   www.cs.princeton.edu/~rs
+
+
+The following paper gives valuable additional insights into
+the algorithm, but is not immediately the basis of any code used
+in bzip2.
+
+Peter Fenwick:
+   Block Sorting Text Compression
+   Proceedings of the 19th Australasian Computer Science Conference,
+     Melbourne, Australia.  Jan 31 - Feb 2, 1996.
+   ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps
+
+Kunihiko Sadakane's sorting algorithm, mentioned above, is
+available from:
+
+http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz
+
+
+The Manber-Myers suffix array construction algorithm is
+described in a paper available from:
+
+http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps
+
+
+Finally, the following papers document some
+investigations I made into the performance of sorting
+and decompression algorithms:
+
+Julian Seward
+   On the Performance of BWT Sorting Algorithms
+   Proceedings of the IEEE Data Compression Conference 2000
+     Snowbird, Utah.  28-30 March 2000.
+
+Julian Seward
+   Space-time Tradeoffs in the Inverse B-W Transform
+   Proceedings of the IEEE Data Compression Conference 2001
+     Snowbird, Utah.  27-29 March 2001.
+
+
+
+
+
+
+
diff --git a/sys/src/external/bzip2/mk251.c b/sys/src/external/bzip2/mk251.c
new file mode 100644
index 00000000..6c5bbf93
--- /dev/null
+++ b/sys/src/external/bzip2/mk251.c
@@ -0,0 +1,31 @@
+
+/* Spew out a long sequence of the byte 251.  When fed to bzip2
+   versions 1.0.0 or 1.0.1, causes it to die with internal error
+   1007 in blocksort.c.  This assertion misses an extremely rare
+   case, which is fixed in this version (1.0.2) and above.
+*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include 
+
+int main ()
+{
+   int i;
+   for (i = 0; i < 48500000 ; i++)
+     putchar(251);
+   return 0;
+}
diff --git a/sys/src/external/bzip2/mkfile b/sys/src/external/bzip2/mkfile
deleted file mode 100644
index 8f2f6d5c..00000000
--- a/sys/src/external/bzip2/mkfile
+++ /dev/null
@@ -1,29 +0,0 @@
- (e.g. 1.0.7)"
+  exit 1
+fi
+
+LANG=C
+VERSION="$1"
+DATE=$(date +"%d %B %Y")
+DAY=$(date +"%d")
+MONTH=$(date +"%B")
+SHORTMONTH=$(date +"%b")
+YEAR=$(date +"%Y")
+
+# Replace the version strings and date ranges in the comments
+VER_PREFIX="bzip2/libbzip2 version "
+sed -i -e "s@${VER_PREFIX}[0-9].*@${VER_PREFIX}${VERSION} of ${DATE}@" \
+       -e "s@ (C) \([0-9]\+\)-[0-9]\+ @ (C) \1-$YEAR @" \
+  CHANGES LICENSE Makefile* README* *.c *.h *.pl *.sh
+
+# Add an entry to the README
+printf "%2s %8s %s\n" "$DAY" "$MONTH" "$YEAR (bzip2, version $VERSION)" \
+  >> README
+
+# Update manual
+sed -i -e "s@ENTITY bz-version \".*\"@ENTITY bz-version \"$VERSION\"@" \
+       -e "s@ENTITY bz-date \".*\"@ENTITY bz-date \"$DAY $MONTH $YEAR\"@" \
+       -e "s@ENTITY bz-lifespan \"\([0-9]\+\)-[0-9]\+\"@ENTITY bz-lifespan \"\1-$YEAR\"@"\
+  entities.xml
+
+# bzip2.1 should really be generated from the manual.xml, but currently
+# isn't, so explicitly change it here too.
+sed -i -e "s@This manual page pertains to version .* of@This manual page pertains to version $VERSION of@" \
+       -e "s@sorting file compressor, v.*@sorting file compressor, v$VERSION@" \
+  bzip2.1
+
+# Update sources. All sources, use bzlib_private.
+# Except bzip2recover, which embeds a version string...
+sed -i -e "s@^#define BZ_VERSION  \".*\"@#define BZ_VERSION  \"${VERSION}, ${DAY}-${SHORTMONTH}-${YEAR}\"@" \
+  bzlib_private.h
+sed -i -e "s@\"bzip2recover .*: extracts blocks from damaged@\"bzip2recover ${VERSION}: extracts blocks from damaged@" \
+  bzip2recover.c
+
+# And finally update the version/dist/so_name in the Makefiles.
+sed -i -e "s@^DISTNAME=bzip2-.*@DISTNAME=bzip2-${VERSION}@" \
+  Makefile
+sed -i -e "s@libbz2\.so\.[0-9]\.[0-9]\.[0-9]*@libbz2\.so\.${VERSION}@" \
+  Makefile-libbz2_so
+
+echo "Now make sure the diff looks correct:"
+echo "  git diff"
+echo
+echo "And make sure there is a $VERSION section in the CHANGES file."
+echo
+echo "Double check:"
+echo "  make clean && make dist && make clean && make -f Makefile-libbz2_so"
+echo
+echo "Does everything look fine?"
+echo
+echo "git commit -a -m \"Prepare for $VERSION release.\""
+echo "git push"
+echo
+echo "Wait for the buildbot to give the all green!"
+echo "Then..."
+echo
+echo "git tag -s -m \"bzip2 $VERSION release\" bzip2-$VERSION"
+echo "git push --tags"
+echo
+echo "./release-update.sh"
diff --git a/sys/src/external/bzip2/lib/randtable.c b/sys/src/external/bzip2/randtable.c
similarity index 60%
rename from sys/src/external/bzip2/lib/randtable.c
rename to sys/src/external/bzip2/randtable.c
index 2ab1e952..bdc6d4a4 100644
--- a/sys/src/external/bzip2/lib/randtable.c
+++ b/sys/src/external/bzip2/randtable.c
@@ -4,62 +4,21 @@
 /*---                                           randtable.c ---*/
 /*-------------------------------------------------------------*/
 
-/*--
-  This file is a part of bzip2 and/or libbzip2, a program and
-  library for lossless, block-sorting data compression.
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
 
-  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
 
-  Redistribution and use in source and binary forms, with or without
-  modification, are permitted provided that the following conditions
-  are met:
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
 
-  1. Redistributions of source code must retain the above copyright
-     notice, this list of conditions and the following disclaimer.
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
 
-  2. The origin of this software must not be misrepresented; you must 
-     not claim that you wrote the original software.  If you use this 
-     software in a product, an acknowledgment in the product 
-     documentation would be appreciated but is not required.
 
-  3. Altered source versions must be plainly marked as such, and must
-     not be misrepresented as being the original software.
-
-  4. The name of the author may not be used to endorse or promote 
-     products derived from this software without specific prior written 
-     permission.
-
-  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
-  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
-  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-  Julian Seward, Cambridge, UK.
-  jseward@acm.org
-  bzip2/libbzip2 version 1.0 of 21 March 2000
-
-  This program is based on (at least) the work of:
-     Mike Burrows
-     David Wheeler
-     Peter Fenwick
-     Alistair Moffat
-     Radford Neal
-     Ian H. Witten
-     Robert Sedgewick
-     Jon L. Bentley
-
-  For more information on these sources, see the manual.
---*/
-
-#include "os.h"
-#include "bzlib.h"
 #include "bzlib_private.h"
 
 
diff --git a/sys/src/external/bzip2/release-update.sh b/sys/src/external/bzip2/release-update.sh
new file mode 100755
index 00000000..d860f675
--- /dev/null
+++ b/sys/src/external/bzip2/release-update.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Script to run after a release has been tagged, signed and pushed
+# to git.  Will do a fresh checkout, verify the git tag, do fresh
+# build/dist, sign the dist with gpg, create a backup copy in HOME,
+# upload the tar.gz and sig to sourceware, checkout bzip2-htdocs,
+# copy over the new changes, manual, etc. and git push that to update
+# https://sourceware.org/bzip2/
+
+# Any error is fatal
+set -e
+
+# We take one argument, the version (e.g. 1.0.7)
+if [ $# -ne 1 ]; then
+  echo "$0  (e.g. 1.0.7)"
+  exit 1
+fi
+
+VERSION="$1"
+echo
+echo "  === NOTE ===  "
+echo
+echo "Requires a sourceware account in the bzip2 group."
+echo
+echo "Make sure the git repo was tagged, signed and pushed"
+echo "If not, please double check the source tree is release ready first"
+echo "You probably want to run ./prepare-release.sh $VERSION first."
+echo "Then do:"
+echo
+echo "    git tag -s -m \"bzip2 $VERSION release\" bzip2-$VERSION"
+echo "    git push --tags"
+echo
+read -p "Do you want to continue creating/uploading the release (yes/no)? "
+
+if [ "x$REPLY" != "xyes" ]; then
+  echo "OK, till next time."
+  exit
+fi
+
+echo "OK, creating and updating the release."
+
+# Create a temporary directoy and make sure it is cleaned up.
+tempdir=$(mktemp -d) || exit
+trap "rm -rf -- ${tempdir}" EXIT
+
+pushd "${tempdir}"
+
+# Checkout
+git clone git://sourceware.org/git/bzip2.git
+cd bzip2
+git tag --verify "bzip2-${VERSION}"
+git checkout -b "$VERSION" "bzip2-${VERSION}"
+
+# Create dist (creates bzip2-${VERSION}.tar.gz)
+make dist
+
+# Sign (creates bzip2-${VERSION}.tar.gz.sig)
+gpg -b bzip2-${VERSION}.tar.gz
+
+# Create backup copy
+echo "Putting a backup copy in $HOME/bzip2-$VERSION"
+mkdir $HOME/bzip2-$VERSION
+cp bzip2-${VERSION}.tar.gz bzip2-${VERSION}.tar.gz.sig $HOME/bzip2-$VERSION/
+
+# Upload
+scp bzip2-${VERSION}.tar.gz bzip2-${VERSION}.tar.gz.sig \
+    sourceware.org:/sourceware/ftp/pub/bzip2/
+ssh sourceware.org "(cd /sourceware/ftp/pub/bzip2 \
+  && ln -sf bzip2-$VERSION.tar.gz bzip2-latest.tar.gz \
+  && ln -sf bzip2-$VERSION.tar.gz.sig bzip2-latest.tar.gz.sig \
+  && ls -lah bzip2-latest*)"
+
+# Update homepage, manual, etc.
+cd "${tempdir}"
+git clone ssh://sourceware.org/git/bzip2-htdocs.git
+cp bzip2/CHANGES bzip2/bzip.css bzip2-htdocs/
+cp bzip2/bzip.css bzip2/bzip2.txt bzip2/manual.{html,pdf} bzip2-htdocs/manual/
+cd bzip2-htdocs
+
+# Update version in html pages.
+sed -i -e "s/The current stable version is bzip2 [0-9]\.[0-9]\.[0-9]\+/The current stable version is bzip2 ${VERSION}/" *.html */*.html
+
+git commit -a -m "Update for bzip2 $VERSION release"
+git show
+git push
+
+# Cleanup
+popd
+trap - EXIT
+exit
diff --git a/sys/src/external/bzip2/sample1.bz2 b/sys/src/external/bzip2/sample1.bz2
new file mode 100644
index 00000000..18dea600
Binary files /dev/null and b/sys/src/external/bzip2/sample1.bz2 differ
diff --git a/sys/src/external/bzip2/sample1.ref b/sys/src/external/bzip2/sample1.ref
new file mode 100644
index 00000000..a56e52b7
Binary files /dev/null and b/sys/src/external/bzip2/sample1.ref differ
diff --git a/sys/src/external/bzip2/sample2.bz2 b/sys/src/external/bzip2/sample2.bz2
new file mode 100644
index 00000000..d5a6160b
Binary files /dev/null and b/sys/src/external/bzip2/sample2.bz2 differ
diff --git a/sys/src/external/bzip2/sample2.ref b/sys/src/external/bzip2/sample2.ref
new file mode 100644
index 00000000..34af9583
Binary files /dev/null and b/sys/src/external/bzip2/sample2.ref differ
diff --git a/sys/src/external/bzip2/sample3.bz2 b/sys/src/external/bzip2/sample3.bz2
new file mode 100644
index 00000000..d90cff92
Binary files /dev/null and b/sys/src/external/bzip2/sample3.bz2 differ
diff --git a/sys/src/external/bzip2/sample3.ref b/sys/src/external/bzip2/sample3.ref
new file mode 100644
index 00000000..775a2f68
--- /dev/null
+++ b/sys/src/external/bzip2/sample3.ref
@@ -0,0 +1,30007 @@
+This file is exceedingly boring.  If you find yourself
+reading it, please (1) take it from me that you can safely
+guess what the rest of the file says, and (2) seek professional
+help.
+
+ps.  there are no further sarcastic remarks in this file.
+
+ugh
+ugh
+ugh
+ugh
+ugh
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+ugh
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diff --git a/sys/src/external/bzip2/spewG.c b/sys/src/external/bzip2/spewG.c
new file mode 100644
index 00000000..65d24c89
--- /dev/null
+++ b/sys/src/external/bzip2/spewG.c
@@ -0,0 +1,54 @@
+
+/* spew out a thoroughly gigantic file designed so that bzip2
+   can compress it reasonably rapidly.  This is to help test
+   support for large files (> 2GB) in a reasonable amount of time.
+   I suggest you use the undocumented --exponential option to
+   bzip2 when compressing the resulting file; this saves a bit of
+   time.  Note: *don't* bother with --exponential when compressing 
+   Real Files; it'll just waste a lot of CPU time :-)
+   (but is otherwise harmless).
+*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+	 ------------------------------------------------------------------ */
+
+
+#define _FILE_OFFSET_BITS 64
+
+#include 
+#include 
+
+/* The number of megabytes of junk to spew out (roughly) */
+#define MEGABYTES 5000
+
+#define N_BUF 1000000
+char buf[N_BUF];
+
+int main ( int argc, char** argv )
+{
+   int ii, kk, p;
+   srandom(1);
+   setbuffer ( stdout, buf, N_BUF );
+   for (kk = 0; kk < MEGABYTES * 515; kk+=3) {
+      p = 25+random()%50;
+      for (ii = 0; ii < p; ii++)
+         printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" );
+      for (ii = 0; ii < p-1; ii++)
+         printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
+      for (ii = 0; ii < p+1; ii++)
+         printf ( "ccccccccccccccccccccccccccccccccccccc" );
+   }
+   fflush(stdout);
+   return 0;
+}
diff --git a/sys/src/external/bzip2/unzcrash.c b/sys/src/external/bzip2/unzcrash.c
new file mode 100644
index 00000000..c68f93c5
--- /dev/null
+++ b/sys/src/external/bzip2/unzcrash.c
@@ -0,0 +1,141 @@
+
+/* A test program written to test robustness to decompression of
+   corrupted data.  Usage is 
+       unzcrash filename
+   and the program will read the specified file, compress it (in memory),
+   and then repeatedly decompress it, each time with a different bit of
+   the compressed data inverted, so as to test all possible one-bit errors.
+   This should not cause any invalid memory accesses.  If it does, 
+   I want to know about it!
+
+   PS.  As you can see from the above description, the process is
+   incredibly slow.  A file of size eg 5KB will cause it to run for
+   many hours.
+*/
+
+/* ------------------------------------------------------------------
+   This file is part of bzip2/libbzip2, a program and library for
+   lossless, block-sorting data compression.
+
+   bzip2/libbzip2 version 1.0.8 of 13 July 2019
+   Copyright (C) 1996-2019 Julian Seward 
+
+   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+   README file.
+
+   This program is released under the terms of the license contained
+   in the file LICENSE.
+   ------------------------------------------------------------------ */
+
+
+#include 
+#include 
+#include "bzlib.h"
+
+#define M_BLOCK 1000000
+
+typedef unsigned char uchar;
+
+#define M_BLOCK_OUT (M_BLOCK + 1000000)
+uchar inbuf[M_BLOCK];
+uchar outbuf[M_BLOCK_OUT];
+uchar zbuf[M_BLOCK + 600 + (M_BLOCK / 100)];
+
+int nIn, nOut, nZ;
+
+static char *bzerrorstrings[] = {
+       "OK"
+      ,"SEQUENCE_ERROR"
+      ,"PARAM_ERROR"
+      ,"MEM_ERROR"
+      ,"DATA_ERROR"
+      ,"DATA_ERROR_MAGIC"
+      ,"IO_ERROR"
+      ,"UNEXPECTED_EOF"
+      ,"OUTBUFF_FULL"
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+};
+
+void flip_bit ( int bit )
+{
+   int byteno = bit / 8;
+   int bitno  = bit % 8;
+   uchar mask = 1 << bitno;
+   //fprintf ( stderr, "(byte %d  bit %d  mask %d)",
+   //          byteno, bitno, (int)mask );
+   zbuf[byteno] ^= mask;
+}
+
+int main ( int argc, char** argv )
+{
+   FILE* f;
+   int   r;
+   int   bit;
+   int   i;
+
+   if (argc != 2) {
+      fprintf ( stderr, "usage: unzcrash filename\n" );
+      return 1;
+   }
+
+   f = fopen ( argv[1], "r" );
+   if (!f) {
+      fprintf ( stderr, "unzcrash: can't open %s\n", argv[1] );
+      return 1;
+   }
+
+   nIn = fread ( inbuf, 1, M_BLOCK, f );
+   fprintf ( stderr, "%d bytes read\n", nIn );
+
+   nZ = M_BLOCK;
+   r = BZ2_bzBuffToBuffCompress (
+         zbuf, &nZ, inbuf, nIn, 9, 0, 30 );
+
+   assert (r == BZ_OK);
+   fprintf ( stderr, "%d after compression\n", nZ );
+
+   for (bit = 0; bit < nZ*8; bit++) {
+      fprintf ( stderr, "bit %d  ", bit );
+      flip_bit ( bit );
+      nOut = M_BLOCK_OUT;
+      r = BZ2_bzBuffToBuffDecompress (
+            outbuf, &nOut, zbuf, nZ, 0, 0 );
+      fprintf ( stderr, " %d  %s ", r, bzerrorstrings[-r] );
+
+      if (r != BZ_OK) {
+         fprintf ( stderr, "\n" );
+      } else {
+         if (nOut != nIn) {
+           fprintf(stderr, "nIn/nOut mismatch %d %d\n", nIn, nOut );
+           return 1;
+         } else {
+           for (i = 0; i < nOut; i++)
+             if (inbuf[i] != outbuf[i]) { 
+                fprintf(stderr, "mismatch at %d\n", i ); 
+                return 1; 
+           }
+           if (i == nOut) fprintf(stderr, "really ok!\n" );
+         }
+      }
+
+      flip_bit ( bit );
+   }
+
+#if 0
+   assert (nOut == nIn);
+   for (i = 0; i < nOut; i++) {
+     if (inbuf[i] != outbuf[i]) {
+        fprintf ( stderr, "difference at %d !\n", i );
+        return 1;
+     }
+   }
+#endif
+
+   fprintf ( stderr, "all ok\n" );
+   return 0;
+}
diff --git a/sys/src/external/bzip2/words0 b/sys/src/external/bzip2/words0
new file mode 100644
index 00000000..fbf442ad
--- /dev/null
+++ b/sys/src/external/bzip2/words0
@@ -0,0 +1,9 @@
+
+If compilation produces errors, or a large number of warnings,
+please read README.COMPILATION.PROBLEMS -- you might be able to
+adjust the flags in this Makefile to improve matters.
+
+Also in README.COMPILATION.PROBLEMS are some hints that may help
+if your build produces an executable which is unable to correctly
+handle so-called 'large files' -- files of size 2GB or more.
+
diff --git a/sys/src/external/bzip2/words1 b/sys/src/external/bzip2/words1
new file mode 100644
index 00000000..2e83de9f
--- /dev/null
+++ b/sys/src/external/bzip2/words1
@@ -0,0 +1,4 @@
+
+Doing 6 tests (3 compress, 3 uncompress) ...
+If there's a problem, things might stop at this point.
+ 
diff --git a/sys/src/external/bzip2/words2 b/sys/src/external/bzip2/words2
new file mode 100644
index 00000000..203ee39c
--- /dev/null
+++ b/sys/src/external/bzip2/words2
@@ -0,0 +1,5 @@
+
+Checking test results.  If any of the four "cmp"s which follow
+report any differences, something is wrong.  If you can't easily
+figure out what, please let me know (jseward@acm.org).
+
diff --git a/sys/src/external/bzip2/words3 b/sys/src/external/bzip2/words3
new file mode 100644
index 00000000..69726699
--- /dev/null
+++ b/sys/src/external/bzip2/words3
@@ -0,0 +1,30 @@
+
+If you got this far and the 'cmp's didn't complain, it looks
+like you're in business.  
+
+To install in /usr/local/bin, /usr/local/lib, /usr/local/man and 
+/usr/local/include, type
+
+   make install
+
+To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type 
+
+   make install PREFIX=/xxx/yyy
+
+If you are (justifiably) paranoid and want to see what 'make install'
+is going to do, you can first do
+
+   make -n install                      or
+   make -n install PREFIX=/xxx/yyy      respectively.
+
+The -n instructs make to show the commands it would execute, but
+not actually execute them.
+
+Instructions for use are in the preformatted manual page, in the file
+bzip2.txt.  For more detailed documentation, read the full manual.  
+It is available in Postscript form (manual.ps), PDF form (manual.pdf),
+and HTML form (manual.html).
+
+You can also do "bzip2 --help" to see some helpful information. 
+"bzip2 -L" displays the software license.
+
diff --git a/sys/src/external/bzip2/xmlproc.sh b/sys/src/external/bzip2/xmlproc.sh
new file mode 100755
index 00000000..16fe72b2
--- /dev/null
+++ b/sys/src/external/bzip2/xmlproc.sh
@@ -0,0 +1,114 @@
+#!/bin/bash
+# see the README file for usage etc.
+#
+# ------------------------------------------------------------------
+#  This file is part of bzip2/libbzip2, a program and library for
+#  lossless, block-sorting data compression.
+#
+#  bzip2/libbzip2 version 1.0.8 of 13 July 2019
+#  Copyright (C) 1996-2019 Julian Seward 
+#
+#  Please read the WARNING, DISCLAIMER and PATENTS sections in the 
+#  README file.
+#
+#  This program is released under the terms of the license contained
+#  in the file LICENSE.
+# ----------------------------------------------------------------
+
+
+usage() {
+  echo '';
+  echo 'Usage: xmlproc.sh -[option] ';
+  echo 'Specify a target from:';
+  echo '-v      verify xml file conforms to dtd';
+  echo '-html   output in html format (single file)';
+  echo '-ps     output in postscript format';
+  echo '-pdf    output in pdf format';
+  exit;
+}
+
+if test $# -ne 2; then
+  usage
+fi
+# assign the variable for the output type
+action=$1; shift
+# assign the output filename
+xmlfile=$1; shift
+# and check user input it correct
+if !(test -f $xmlfile); then
+  echo "No such file: $xmlfile";
+  exit;
+fi
+# some other stuff we will use
+OUT=output
+xsl_fo=bz-fo.xsl
+xsl_html=bz-html.xsl
+
+basename=$xmlfile
+basename=${basename//'.xml'/''}
+
+fofile="${basename}.fo"
+htmlfile="${basename}.html"
+pdffile="${basename}.pdf"
+psfile="${basename}.ps"
+xmlfmtfile="${basename}.fmt"
+
+# first process the xmlfile with CDATA tags
+./format.pl $xmlfile $xmlfmtfile
+# so the shell knows where the catalogs live
+export XML_CATALOG_FILES=/etc/xml/catalog
+
+# post-processing tidy up
+cleanup() {
+  echo "Cleaning up: $@" 
+  while [ $# != 0 ]
+  do
+    arg=$1; shift;
+    echo "  deleting $arg";
+    rm $arg
+  done
+}
+
+case $action in
+  -v)
+   flags='--noout --xinclude --noblanks --postvalid'
+   dtd='--dtdvalid http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd'
+   xmllint $flags $dtd $xmlfmtfile 2> $OUT 
+   egrep 'error' $OUT 
+   rm $OUT
+  ;;
+
+  -html)
+   echo "Creating $htmlfile ..."
+   xsltproc --nonet --xinclude  -o $htmlfile $xsl_html $xmlfmtfile
+   cleanup $xmlfmtfile
+  ;;
+
+  -pdf)
+   echo "Creating $pdffile ..."
+   xsltproc --nonet --xinclude -o $fofile $xsl_fo $xmlfmtfile
+   pdfxmltex $fofile >$OUT $OUT $OUT $OUT $OUT $OUT $OUT $OUT $OUT