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ArchiveRecovery.cpp
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ArchiveRecovery.cpp
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//this file is part of eMule
//Copyright (C)2002-2008 Merkur ( strEmail.Format("%s@%s", "devteam", "emule-project.net") / http://www.emule-project.net )
//
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either
//version 2 of the License, or (at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include "stdafx.h"
#include "emule.h"
#include "ArchiveRecovery.h"
#include "OtherFunctions.h"
#include "Preferences.h"
#include "PartFile.h"
#include <zlib/zlib.h>
#include "Log.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#pragma pack(push,1)
typedef struct {
BYTE type;
WORD flags;
WORD size;
} RARMAINHDR;
#pragma pack(pop)
#pragma pack(push,1)
typedef struct {
BYTE type;
WORD flags;
WORD size;
DWORD packetSize;
DWORD unpacketSize;
BYTE hostOS;
DWORD fileCRC;
DWORD fileTime;
BYTE unpVer;
BYTE method;
WORD nameSize;
DWORD fileAttr;
} RARFILEHDR;
#pragma pack(pop)
void CArchiveRecovery::recover(CPartFile *partFile, bool preview, bool bCreatePartFileCopy)
{
if (partFile->m_bPreviewing || partFile->m_bRecoveringArchive)
return;
partFile->m_bRecoveringArchive = true;
AddLogLine(true, _T("%s \"%s\""), GetResString(IDS_ATTEMPTING_RECOVERY), partFile->GetFileName());
// Get the current filled list for this file
CTypedPtrList<CPtrList, Gap_Struct*> *filled = new CTypedPtrList<CPtrList, Gap_Struct*>;
partFile->GetFilledList(filled);
#ifdef _DEBUG
{
int i = 0;
TRACE("%s: filled\n", __FUNCTION__);
POSITION pos = filled->GetHeadPosition();
while (pos){
Gap_Struct* gap = filled->GetNext(pos);
TRACE("%3u: %10u %10u (%u)\n", i++, gap->start, gap->end, gap->end - gap->start + 1);
}
}
#endif
// The rest of the work can be safely done in a new thread
ThreadParam *tp = new ThreadParam;
tp->partFile = partFile;
tp->filled = filled;
tp->preview = preview;
tp->bCreatePartFileCopy = bCreatePartFileCopy;
// - do NOT use Windows API 'CreateThread' to create a thread which uses MFC/CRT -> lot of mem leaks!
if (!AfxBeginThread(run, (LPVOID)tp)){
partFile->m_bRecoveringArchive = false;
LogError(LOG_STATUSBAR, _T("%s \"%s\""), GetResString(IDS_RECOVERY_FAILED), partFile->GetFileName());
// Need to delete the memory here as won't be done in thread
DeleteMemory(tp);
}
}
UINT AFX_CDECL CArchiveRecovery::run(LPVOID lpParam)
{
ThreadParam *tp = (ThreadParam *)lpParam;
DbgSetThreadName("ArchiveRecovery");
InitThreadLocale();
//Xman
// BEGIN SLUGFILLER: SafeHash
CReadWriteLock lock(&theApp.m_threadlock);
if (!lock.ReadLock(0))
return 0;
// END SLUGFILLER: SafeHash
if (!performRecovery(tp->partFile, tp->filled, tp->preview, tp->bCreatePartFileCopy))
theApp.QueueLogLine(true, _T("%s \"%s\""), GetResString(IDS_RECOVERY_FAILED), tp->partFile->GetFileName());
tp->partFile->m_bRecoveringArchive = false;
// Delete memory used by copied gap list
DeleteMemory(tp);
return 0;
}
bool CArchiveRecovery::performRecovery(CPartFile *partFile, CTypedPtrList<CPtrList, Gap_Struct*> *filled,
bool preview, bool bCreatePartFileCopy)
{
if (filled->GetCount()==0)
return false;
bool success = false;
try
{
CFile temp;
CString tempFileName;
if (bCreatePartFileCopy)
{
// Copy the file
tempFileName = partFile->GetTempPath() + partFile->GetFileName().Mid(0, 5) + _T("-rec.tmp");
if (!CopyFile(partFile, filled, tempFileName))
return false;
// Open temp file for reading
if (!temp.Open(tempFileName, CFile::modeRead|CFile::shareDenyWrite))
return false;
}
else
{
if (!temp.Open(partFile->GetFilePath(), CFile::modeRead | CFile::shareDenyNone))
return false;
}
// Open the output file
EFileType myAtype=GetFileTypeEx(partFile);
CString ext;
if (myAtype==ARCHIVE_ZIP)
ext=_T(".zip");
else if (myAtype==ARCHIVE_RAR)
ext=_T(".rar");
else if (myAtype==ARCHIVE_ACE)
ext=_T(".ace");
CString outputFileName = partFile->GetTempPath() + partFile->GetFileName().Mid(0, 5) + _T("-rec") + ext;
CFile output;
ULONGLONG ulTempFileSize = 0;
if (output.Open(outputFileName, CFile::modeWrite | CFile::shareDenyWrite | CFile::modeCreate))
{
// Process the output file
if ( myAtype==ARCHIVE_ZIP)
success = recoverZip(&temp, &output, NULL, filled, (temp.GetLength() == partFile->GetFileSize()));
else if(myAtype==ARCHIVE_RAR)
success = recoverRar(&temp, &output, NULL, filled);
else if(myAtype==ARCHIVE_ACE)
success = recoverAce(&temp, &output, NULL, filled);
ulTempFileSize = output.GetLength();
// Close output
output.Close();
}
// Close temp file
temp.Close();
// Remove temp file
if (!tempFileName.IsEmpty() )
CFile::Remove(tempFileName);
// Report success
if (success)
{
theApp.QueueLogLine(true, _T("%s \"%s\""), GetResString(IDS_RECOVERY_SUCCESSFUL), partFile->GetFileName());
theApp.QueueDebugLogLine(false, _T("Archive recovery: Part file size: %s, temp. archive file size: %s (%.1f%%)"), CastItoXBytes(partFile->GetFileSize()), CastItoXBytes(ulTempFileSize), partFile->GetFileSize() > (uint64)0 ? (ulTempFileSize * 100.0 / (uint64)partFile->GetFileSize()) : 0.0);
// Preview file if required
if (preview)
{
SHELLEXECUTEINFO SE;
memset(&SE,0,sizeof(SE));
SE.fMask = SEE_MASK_NOCLOSEPROCESS ;
SE.lpVerb = _T("open");
SE.lpFile = outputFileName;
SE.nShow = SW_SHOW;
SE.cbSize = sizeof(SE);
ShellExecuteEx(&SE);
if (SE.hProcess)
{
WaitForSingleObject(SE.hProcess, INFINITE);
CloseHandle(SE.hProcess);
}
CFile::Remove(outputFileName);
}
} else
CFile::Remove(outputFileName);
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
return success;
}
bool CArchiveRecovery::recoverZip(CFile *zipInput, CFile *zipOutput, archiveScannerThreadParams_s* aitp ,
CTypedPtrList<CPtrList, Gap_Struct*> *filled, bool fullSize)
{
bool retVal = false;
long fileCount = 0;
try
{
CTypedPtrList<CPtrList, ZIP_CentralDirectory*>* centralDirectoryEntries;
if (aitp==NULL) {
centralDirectoryEntries= new CTypedPtrList<CPtrList, ZIP_CentralDirectory*>;
} else {
centralDirectoryEntries=aitp->ai->centralDirectoryEntries;
}
Gap_Struct *fill;
// If the central directory is intact this is simple
if (fullSize && readZipCentralDirectory(zipInput, centralDirectoryEntries, filled))
{
if (centralDirectoryEntries->GetCount() == 0)
{
if (aitp == NULL)
delete centralDirectoryEntries;
return false;
}
// if only read directory, return now
if (zipOutput==NULL) {
if (aitp == NULL) {
ASSERT(0); // FIXME
delete centralDirectoryEntries;
return false;
}
aitp->ai->bZipCentralDir = true;
return true;
}
ZIP_CentralDirectory *cdEntry;
POSITION pos = centralDirectoryEntries->GetHeadPosition();
bool deleteCD;
for (int i=centralDirectoryEntries->GetCount(); i>0; i--)
{
deleteCD = false;
cdEntry = centralDirectoryEntries->GetAt(pos);
uint32 lenEntry = sizeof(ZIP_Entry) + cdEntry->lenFilename + cdEntry->lenExtraField + cdEntry->lenCompressed;
if (IsFilled(cdEntry->relativeOffsetOfLocalHeader, cdEntry->relativeOffsetOfLocalHeader + lenEntry, filled))
{
zipInput->Seek(cdEntry->relativeOffsetOfLocalHeader, CFile::begin);
// Update offset
cdEntry->relativeOffsetOfLocalHeader = (UINT)zipOutput->GetPosition();
if (!processZipEntry(zipInput, zipOutput, lenEntry, NULL))
deleteCD = true;
}
else
deleteCD = true;
if (deleteCD)
{
delete [] cdEntry->filename;
if (cdEntry->lenExtraField > 0)
delete [] cdEntry->extraField;
if (cdEntry->lenComment > 0)
delete [] cdEntry->comment;
delete cdEntry;
POSITION del = pos;
centralDirectoryEntries->GetNext(pos);
centralDirectoryEntries->RemoveAt(del);
}
else
centralDirectoryEntries->GetNext(pos);
}
}
else // Have to scan the file the hard way
{
// Loop through filled areas of the file looking for entries
POSITION pos = filled->GetHeadPosition();
while (pos != NULL)
{
fill = filled->GetNext(pos);
uint32 filePos = (UINT)zipInput->GetPosition();
// The file may have been positioned to the next entry in ScanForMarker() or processZipEntry()
if (filePos > fill->end)
continue;
if (filePos < fill->start)
zipInput->Seek(fill->start, CFile::begin);
// If there is any problem, then don't bother checking the rest of this part
for (;;)
{
if (aitp && !aitp->m_bIsValid)
return 0;
// Scan for entry marker within this filled area
if (!scanForZipMarker(zipInput, aitp, (uint32)ZIP_LOCAL_HEADER_MAGIC, (UINT)(fill->end - zipInput->GetPosition() + 1)))
break;
if (zipInput->GetPosition() > fill->end)
break;
if (!processZipEntry(zipInput, zipOutput, (UINT)(fill->end - zipInput->GetPosition() + 1), centralDirectoryEntries))
break;
}
}
if (!zipOutput)
{
retVal = (centralDirectoryEntries->GetCount()>0 );
if (aitp == NULL)
delete centralDirectoryEntries;
return retVal;
}
}
// Remember offset before CD entries
uint32 startOffset = (UINT)zipOutput->GetPosition();
// Write all central directory entries
fileCount = centralDirectoryEntries->GetCount();
if (fileCount > 0)
{
ZIP_CentralDirectory *cdEntry;
POSITION pos = centralDirectoryEntries->GetHeadPosition();
while (pos != NULL)
{
cdEntry = centralDirectoryEntries->GetNext(pos);
writeUInt32(zipOutput, ZIP_CD_MAGIC);
writeUInt16(zipOutput, cdEntry->versionMadeBy);
writeUInt16(zipOutput, cdEntry->versionToExtract);
writeUInt16(zipOutput, cdEntry->generalPurposeFlag);
writeUInt16(zipOutput, cdEntry->compressionMethod);
writeUInt16(zipOutput, cdEntry->lastModFileTime);
writeUInt16(zipOutput, cdEntry->lastModFileDate);
writeUInt32(zipOutput, cdEntry->crc32);
writeUInt32(zipOutput, cdEntry->lenCompressed);
writeUInt32(zipOutput, cdEntry->lenUncompressed);
writeUInt16(zipOutput, cdEntry->lenFilename);
writeUInt16(zipOutput, cdEntry->lenExtraField);
writeUInt16(zipOutput, cdEntry->lenComment);
writeUInt16(zipOutput, 0); // Disk number start
writeUInt16(zipOutput, cdEntry->internalFileAttributes);
writeUInt32(zipOutput, cdEntry->externalFileAttributes);
writeUInt32(zipOutput, cdEntry->relativeOffsetOfLocalHeader);
zipOutput->Write(cdEntry->filename, cdEntry->lenFilename);
if (cdEntry->lenExtraField > 0)
zipOutput->Write(cdEntry->extraField, cdEntry->lenExtraField);
if (cdEntry->lenComment > 0)
zipOutput->Write(cdEntry->comment, cdEntry->lenComment);
delete [] cdEntry->filename;
if (cdEntry->lenExtraField > 0)
delete [] cdEntry->extraField;
if (cdEntry->lenComment > 0)
delete [] cdEntry->comment;
delete cdEntry;
}
// Remember offset before CD entries
uint32 endOffset = (UINT)zipOutput->GetPosition();
// Write end of central directory
writeUInt32(zipOutput, ZIP_END_CD_MAGIC);
writeUInt16(zipOutput, 0); // Number of this disk
writeUInt16(zipOutput, 0); // Number of the disk with the start of the central directory
writeUInt16(zipOutput, (uint16)fileCount);
writeUInt16(zipOutput, (uint16)fileCount);
writeUInt32(zipOutput, endOffset - startOffset);
writeUInt32(zipOutput, startOffset);
writeUInt16(zipOutput, (uint16)strlen(ZIP_COMMENT));
zipOutput->Write(ZIP_COMMENT, strlen(ZIP_COMMENT));
centralDirectoryEntries->RemoveAll();
}
if (aitp == NULL)
delete centralDirectoryEntries;
retVal = true;
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
// Tell the user how many files were recovered
CString msg;
if (fileCount == 1)
msg = GetResString(IDS_RECOVER_SINGLE);
else
msg.Format(GetResString(IDS_RECOVER_MULTIPLE), fileCount);
theApp.QueueLogLine(true, _T("%s"), msg);
return retVal;
}
bool CArchiveRecovery::readZipCentralDirectory(CFile *zipInput, CTypedPtrList<CPtrList, ZIP_CentralDirectory*> *centralDirectoryEntries, CTypedPtrList<CPtrList, Gap_Struct*> *filled)
{
bool retVal = false;
try
{
// Ideally this zip file will not have a comment and the End-CD will be easy to find
zipInput->Seek(-22, CFile::end);
if (!(readUInt32(zipInput) == ZIP_END_CD_MAGIC))
{
// Have to look for it, comment could be up to 65535 chars but only try with less than 1k
zipInput->Seek(-1046, CFile::end);
if (!scanForZipMarker(zipInput, NULL, (uint32)ZIP_END_CD_MAGIC, 1046))
return false;
// Skip it again
readUInt32(zipInput);
}
// Found End-CD
// Only interested in offset of first CD
zipInput->Seek(12, CFile::current);
uint32 startOffset = readUInt32(zipInput);
if (!IsFilled(startOffset, (UINT)zipInput->GetLength(), filled))
return false;
// Goto first CD and start reading
zipInput->Seek(startOffset, CFile::begin);
ZIP_CentralDirectory *cdEntry;
while (readUInt32(zipInput) == ZIP_CD_MAGIC)
{
cdEntry = new ZIP_CentralDirectory;
cdEntry->versionMadeBy = readUInt16(zipInput);
cdEntry->versionToExtract = readUInt16(zipInput);
cdEntry->generalPurposeFlag = readUInt16(zipInput);
cdEntry->compressionMethod = readUInt16(zipInput);
cdEntry->lastModFileTime = readUInt16(zipInput);
cdEntry->lastModFileDate = readUInt16(zipInput);
cdEntry->crc32 = readUInt32(zipInput);
cdEntry->lenCompressed = readUInt32(zipInput);
cdEntry->lenUncompressed = readUInt32(zipInput);
cdEntry->lenFilename = readUInt16(zipInput);
cdEntry->lenExtraField = readUInt16(zipInput);
cdEntry->lenComment = readUInt16(zipInput);
cdEntry->diskNumberStart = readUInt16(zipInput);
cdEntry->internalFileAttributes = readUInt16(zipInput);
cdEntry->externalFileAttributes = readUInt32(zipInput);
cdEntry->relativeOffsetOfLocalHeader= readUInt32(zipInput);
if (cdEntry->lenFilename > 0)
{
cdEntry->filename = new BYTE[cdEntry->lenFilename];
zipInput->Read(cdEntry->filename, cdEntry->lenFilename);
}
if (cdEntry->lenExtraField > 0)
{
cdEntry->extraField = new BYTE[cdEntry->lenExtraField];
zipInput->Read(cdEntry->extraField, cdEntry->lenExtraField);
}
if (cdEntry->lenComment > 0)
{
cdEntry->comment = new BYTE[cdEntry->lenComment];
zipInput->Read(cdEntry->comment, cdEntry->lenComment);
}
centralDirectoryEntries->AddTail(cdEntry);
}
retVal = true;
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
return retVal;
}
bool CArchiveRecovery::processZipEntry(CFile *zipInput, CFile *zipOutput, uint32 available, CTypedPtrList<CPtrList, ZIP_CentralDirectory*> *centralDirectoryEntries)
{
if (available < 26)
return false;
bool retVal = false;
long startOffset=0;
try
{
// Need to know where it started
if (zipOutput)
startOffset = (long)zipOutput->GetPosition();
else
startOffset = (long)zipInput->GetPosition();
// Entry format :
// 4 2 bytes Version needed to extract
// 6 2 bytes General purpose bit flag
// 8 2 bytes Compression method
// 10 2 bytes Last mod file time
// 12 2 bytes Last mod file date
// 14 4 bytes CRC-32
// 18 4 bytes Compressed size (n)
// 22 4 bytes Uncompressed size
// 26 2 bytes Filename length (f)
// 28 2 bytes Extra field length (e)
// (f)bytes Filename
// (e)bytes Extra field
// (n)bytes Compressed data
// Read header
if (readUInt32(zipInput) != ZIP_LOCAL_HEADER_MAGIC)
return false;
ZIP_Entry entry = {0};
entry.versionToExtract = readUInt16(zipInput);
entry.generalPurposeFlag = readUInt16(zipInput);
entry.compressionMethod = readUInt16(zipInput);
entry.lastModFileTime = readUInt16(zipInput);
entry.lastModFileDate = readUInt16(zipInput);
entry.crc32 = readUInt32(zipInput);
entry.lenCompressed = readUInt32(zipInput);
entry.lenUncompressed = readUInt32(zipInput);
entry.lenFilename = readUInt16(zipInput);
entry.lenExtraField = readUInt16(zipInput);
// Do some quick checks at this stage that data is looking ok
if ((entry.crc32 == 0) && (entry.lenCompressed == 0) && (entry.lenUncompressed == 0) && (entry.lenFilename != 0))
; // this is a directory entry
else if ((entry.crc32 == 0) || (entry.lenCompressed == 0) || (entry.lenUncompressed == 0) || (entry.lenFilename == 0))
return false;
// Is this entry complete
if ((entry.lenFilename + entry.lenExtraField +
((zipOutput!=NULL)?entry.lenCompressed:0)
) > (available - 26))
{
// Move the file pointer to the start of the next entry
zipInput->Seek((entry.lenFilename + entry.lenExtraField + entry.lenCompressed), CFile::current);
return false;
}
// Filename
if (entry.lenFilename > MAX_PATH)
return false; // Possibly corrupt, don't allocate lots of memory
entry.filename = new BYTE[entry.lenFilename];
if (zipInput->Read(entry.filename, entry.lenFilename) != entry.lenFilename)
{
delete [] entry.filename;
return false;
}
// Extra data
if (entry.lenExtraField > 0)
{
entry.extraField = new BYTE[entry.lenExtraField];
zipInput->Read(entry.extraField, entry.lenExtraField);
}
if (zipOutput) {
// Output
writeUInt32(zipOutput, ZIP_LOCAL_HEADER_MAGIC);
writeUInt16(zipOutput, entry.versionToExtract);
writeUInt16(zipOutput, entry.generalPurposeFlag);
writeUInt16(zipOutput, entry.compressionMethod);
writeUInt16(zipOutput, entry.lastModFileTime);
writeUInt16(zipOutput, entry.lastModFileDate);
writeUInt32(zipOutput, entry.crc32);
writeUInt32(zipOutput, entry.lenCompressed);
writeUInt32(zipOutput, entry.lenUncompressed);
writeUInt16(zipOutput, entry.lenFilename);
writeUInt16(zipOutput, entry.lenExtraField);
if (entry.lenFilename > 0)
zipOutput->Write(entry.filename, entry.lenFilename);
if (entry.lenExtraField > 0)
zipOutput->Write(entry.extraField, entry.lenExtraField);
// Read and write compressed data to avoid reading all into memory
uint32 written = 0;
BYTE buf[4096];
uint32 lenChunk = 4096;
while (written < entry.lenCompressed)
{
lenChunk = (entry.lenCompressed - written);
if (lenChunk > 4096)
lenChunk = 4096;
lenChunk = zipInput->Read(buf, lenChunk);
if (lenChunk == 0)
break;
written += lenChunk;
zipOutput->Write(buf, lenChunk);
}
zipOutput->Flush();
}
//Central directory:
if (centralDirectoryEntries != NULL)
{
ZIP_CentralDirectory *cdEntry = new ZIP_CentralDirectory;
cdEntry->header = ZIP_CD_MAGIC;
cdEntry->versionMadeBy = entry.versionToExtract;
cdEntry->versionToExtract = entry.versionToExtract;
cdEntry->generalPurposeFlag = entry.generalPurposeFlag;
cdEntry->compressionMethod = entry.compressionMethod;
cdEntry->lastModFileTime = entry.lastModFileTime;
cdEntry->lastModFileDate = entry.lastModFileDate;
cdEntry->crc32 = entry.crc32;
cdEntry->lenCompressed = entry.lenCompressed;
cdEntry->lenUncompressed = entry.lenUncompressed;
cdEntry->lenFilename = entry.lenFilename;
cdEntry->lenExtraField = entry.lenExtraField;
cdEntry->diskNumberStart = 0;
cdEntry->internalFileAttributes = 1;
cdEntry->externalFileAttributes = 0x81B60020;
cdEntry->relativeOffsetOfLocalHeader = startOffset;
cdEntry->filename = entry.filename;
if (entry.lenExtraField > 0)
cdEntry->extraField = entry.extraField;
cdEntry->lenComment = 0;
if (zipOutput!=NULL) {
cdEntry->lenComment = (uint16)strlen(ZIP_COMMENT);
cdEntry->comment = new BYTE[cdEntry->lenComment];
memcpy(cdEntry->comment, ZIP_COMMENT, cdEntry->lenComment);
}
centralDirectoryEntries->AddTail(cdEntry);
}
else
{
delete [] entry.filename;
if (entry.lenExtraField > 0)
delete [] entry.extraField;
}
retVal = true;
// skip data when reading directory only
if (zipOutput==NULL) {
// out of available data?
if ((entry.lenFilename + entry.lenExtraField + entry.lenCompressed ) > (available - 26))
return false;
zipInput->Seek( entry.lenCompressed, CFile::current);
}
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
return retVal;
}
void CArchiveRecovery::DeleteMemory(ThreadParam *tp)
{
POSITION pos = tp->filled->GetHeadPosition();
while (pos != NULL)
delete tp->filled->GetNext(pos);
tp->filled->RemoveAll();
delete tp->filled;
delete tp;
}
bool CArchiveRecovery::CopyFile(CPartFile *partFile, CTypedPtrList<CPtrList, Gap_Struct*> *filled, CString tempFileName)
{
bool retVal = false;
try
{
CFile srcFile;
if (!srcFile.Open(partFile->GetFilePath(), CFile::modeRead | CFile::shareDenyNone))
return false;
// Open destination file and set length to last filled end position
CFile destFile;
destFile.Open(tempFileName, CFile::modeWrite | CFile::shareDenyWrite | CFile::modeCreate);
Gap_Struct *fill = filled->GetTail();
destFile.SetLength(fill->end);
BYTE buffer[4096];
uint32 read;
uint32 copied;
// Loop through filled areas and copy data
partFile->m_bPreviewing = true;
POSITION pos = filled->GetHeadPosition();
while (pos != NULL)
{
fill = filled->GetNext(pos);
copied = 0;
srcFile.Seek(fill->start, CFile::begin);
destFile.Seek(fill->start, CFile::begin);
while ((read = srcFile.Read(buffer, 4096)) > 0)
{
destFile.Write(buffer, read);
copied += read;
// Stop when finished fill (don't worry about extra)
if (fill->start + copied >= fill->end)
break;
}
}
destFile.Close();
srcFile.Close();
partFile->m_bPreviewing = false;
retVal = true;
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
return retVal;
}
bool CArchiveRecovery::recoverRar(CFile *rarInput, CFile *rarOutput, archiveScannerThreadParams_s* aitp,
CTypedPtrList<CPtrList, Gap_Struct*> *filled)
{
bool retVal = false;
long fileCount = 0;
try
{
// Try to get file header and main header
//
bool bValidFileHeader = false;
bool bOldFormat = false;
bool bValidMainHeader = false;
BYTE fileHeader[7] = {0};
RARMAINHDR mainHeader = {0};
if (rarInput->Read(fileHeader, sizeof fileHeader) == sizeof fileHeader)
{
if (fileHeader[0] == 0x52) {
if (fileHeader[1] == 0x45 && fileHeader[2] ==0x7e && fileHeader[3] == 0x5e) {
bOldFormat = true;
bValidFileHeader = true;
}
else if (fileHeader[1] == 0x61 && fileHeader[2] == 0x72 && fileHeader[3] == 0x21 && fileHeader[4] == 0x1a && fileHeader[5] == 0x07 && fileHeader[6] == 0x00) {
bValidFileHeader = true;
}
}
if (bValidFileHeader && !bOldFormat)
{
WORD checkCRC;
if (rarInput->Read(&checkCRC, sizeof checkCRC) == sizeof checkCRC)
{
if (rarInput->Read(&mainHeader, sizeof mainHeader) == sizeof mainHeader)
{
if (mainHeader.type == 0x73)
{
DWORD crc = crc32(0, (Bytef*)&mainHeader, sizeof mainHeader);
for (UINT i = 0; i < sizeof(WORD) + sizeof(DWORD); i++)
{
BYTE ch;
if (rarInput->Read(&ch, sizeof ch) != sizeof ch)
break;
crc = crc32(crc, &ch, 1);
}
if (checkCRC == (WORD)crc)
bValidMainHeader = true;
}
}
}
}
rarInput->SeekToBegin();
}
static const BYTE start[] = {
// RAR file header
0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00,
// main header
0x08, 0x1A, // CRC
0x73, // type
0x02, 0x00, // flags
0x3B, 0x00, // size
0x00, 0x00, // AV
0x00, 0x00, // AV
0x00, 0x00, // AV
// main comment
0xCA, 0x44, // CRC
0x75, // type
0x00, 0x00, // flags
0x2E, 0x00, // size
0x12, 0x00, 0x14, 0x34, 0x2B,
0x4A, 0x08, 0x15, 0x48, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0A, 0x2B, 0xF9, 0x0E, 0xE2, 0xC1,
0x32, 0xFB, 0x9E, 0x04, 0x10, 0x50, 0xD7, 0xFE, 0xCD, 0x75, 0x87, 0x9C, 0x28, 0x85, 0xDF, 0xA3,
0x97, 0xE0 };
// If this is a 'solid' archive the chance to successfully decompress any entries gets higher,
// when we pass the 'solid' main header bit to the temp. archive.
BYTE start1[sizeof start];
memcpy(start1, start, sizeof start);
if (bValidFileHeader && bValidMainHeader && (mainHeader.flags & 0x0008/*MHD_SOLID*/)) {
start1[10] |= 8; /*MHD_SOLID*/
*((short*)&start1[7]) = (short)crc32(0, &start1[9], 11);
}
if (aitp)
aitp->ai->rarFlags=mainHeader.flags;
if (rarOutput)
rarOutput->Write(start1, sizeof(start1));
RAR_BlockFile *block;
// loop filled blocks
POSITION pos = filled->GetHeadPosition();
Gap_Struct *fill;
while (pos != NULL)
{
fill = filled->GetNext(pos);
rarInput->Seek(fill->start , CFile::begin);
while ((block = scanForRarFileHeader(rarInput, aitp, (fill->end - rarInput->GetPosition() ))) != NULL)
{
if (aitp){
aitp->ai->RARdir->AddTail(block);
if (!aitp->m_bIsValid)
return false;
}
if (rarOutput!=NULL && IsFilled((UINT)block->offsetData, (UINT)(block->offsetData + block->dataLength), filled))
{
// Don't include directories in file count
if ((block->HEAD_FLAGS & 0xE0) != 0xE0)
fileCount++;
if (rarOutput)
writeRarBlock(rarInput, rarOutput, block);
}
else
{
rarInput->Seek(block->offsetData + block->dataLength, CFile::begin);
}
if (aitp==NULL) {
delete [] block->FILE_NAME;
delete block;
}
if (rarInput->GetPosition() >=fill->end)
break;
}
}
retVal = true;
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
// Tell the user how many files were recovered
if (aitp==NULL) {
CString msg;
if (fileCount == 1)
msg = GetResString(IDS_RECOVER_SINGLE);
else
msg.Format(GetResString(IDS_RECOVER_MULTIPLE), fileCount);
theApp.QueueLogLine(true, _T("%s"), msg);
}
return retVal;
}
bool CArchiveRecovery::IsFilled(uint32 start, uint32 end, CTypedPtrList<CPtrList, Gap_Struct*> *filled)
{
POSITION pos = filled->GetHeadPosition();
Gap_Struct *fill;
while (pos != NULL)
{
fill = filled->GetNext(pos);
if (fill->start > start)
return false;
if (fill->end >= end)
return true;
}
return false;
}
// This will find the marker in the file and leave it positioned at the position to read the marker again
bool CArchiveRecovery::scanForZipMarker(CFile *input, archiveScannerThreadParams_s* aitp, uint32 marker, uint32 available)
{
try
{
//uint32 originalOffset = input->GetPosition();
int lenChunk = 51200; // 50k buffer
BYTE chunk[51200];
BYTE *foundPos = NULL;
int pos = 0;
while ((available > 0) && ((lenChunk = input->Read(chunk, lenChunk)) > 0))
{
available -= lenChunk;
foundPos = &chunk[0];
// Move back one, will be incremented in loop
foundPos--;
while (foundPos != NULL)
{
if (aitp && !aitp->m_bIsValid)
return false;
// Find first matching byte
foundPos = (BYTE*)memchr( foundPos+1, (marker & 0xFF), (lenChunk - (foundPos+1 - (&chunk[0]))) );
if (foundPos == NULL)
break;
// Test for end of buffer
pos = foundPos - (&chunk[0]);
if ((pos + 3) > lenChunk)
{
// Re-read buffer starting from found first byte position
input->Seek(pos - lenChunk, CFile::current);
break;
}
if (aitp) {
ProcessProgress(aitp, input->GetPosition() );
}
// Check for other bytes
if (chunk[pos + 1] == ((marker >> 8) & 0xFF))
{
if (chunk[pos + 2] == ((marker >> 16) & 0xFF))
{
if (chunk[pos + 3] == ((marker >> 24) & 0xFF))
{
// Found it
input->Seek(pos - lenChunk, CFile::current);
return true;
}
}
}
}
}
}
catch (CFileException* error){
error->Delete();
}
catch (...){
ASSERT(0);
}
return false;
}
#define TESTCHUNKSIZE 51200 // 50k buffer
// This will find a file block in the file and leave it positioned at the end of the filename
RAR_BlockFile *CArchiveRecovery::scanForRarFileHeader(CFile *input, archiveScannerThreadParams_s* aitp, UINT64 available)
{
RAR_BlockFile *retVal = NULL;
try
{
UINT lenChunk;
BYTE chunk[TESTCHUNKSIZE];
BYTE *foundPos = NULL;
ULONGLONG foundOffset;
ULONGLONG chunkOffset;
UINT64 chunkstart;
uint16 headCRC;
BYTE checkCRC[sizeof(RARFILEHDR) + 8 + sizeof(DWORD)*2 + 512];
unsigned checkCRCsize = 0;
uint16 lenFileName;
BYTE *fileName;
uint32 crc;
while (available > 0)
{
chunkstart=input->GetPosition();
lenChunk = input->Read(chunk, (UINT)(min(available, TESTCHUNKSIZE)) );
if (lenChunk==0)
break;
available-=lenChunk;
foundPos = &chunk[0];
// Move back one, will be incremented in loop
foundPos--;
while (foundPos != NULL)
{
if (aitp && !aitp->m_bIsValid)
return false;
// Find rar head block marker
foundPos = (BYTE*)memchr( foundPos+1, RAR_HEAD_FILE, (lenChunk - (foundPos+1 - (&chunk[0])) ) );