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snapshot.c
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/*
** Oricutron
** Copyright (C) 2009-2014 Peter Gordon
**
** 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, version 2
** of the License.
**
** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
** Snapshot saving & loading
**
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "system.h"
#include "6502.h"
#include "via.h"
#include "8912.h"
#include "gui.h"
#include "disk.h"
#include "monitor.h"
#include "6551.h"
#include "machine.h"
#include "avi.h"
#include "filereq.h"
#include "main.h"
#include "ula.h"
#include "joystick.h"
#include "tape.h"
#include "msgbox.h"
extern char diskpath[];
#define MAX_BLOCK (262144)
static unsigned char *buf;
static int offs = 0;
#define PUTU32(val) ok=putu32(ok, (Uint32)val)
static SDL_bool putu32(SDL_bool stillok, Uint32 val)
{
if (!stillok) return SDL_FALSE;
if ((offs+4) > MAX_BLOCK) return SDL_FALSE;
buf[offs++] = (val>>24)&0xff;
buf[offs++] = (val>>16)&0xff;
buf[offs++] = (val>>8)&0xff;
buf[offs++] = val&0xff;
return SDL_TRUE;
}
#define PUTU16(val) ok=putu16(ok, (Uint16)val)
static SDL_bool putu16(SDL_bool stillok, Uint16 val)
{
if (!stillok) return SDL_FALSE;
if ((offs+2) > MAX_BLOCK) return SDL_FALSE;
buf[offs++] = (val>>8)&0xff;
buf[offs++] = val&0xff;
return SDL_TRUE;
}
#define PUTU8(val) ok=putu8(ok, (Uint8)val)
static SDL_bool putu8(SDL_bool stillok, Uint8 val)
{
if (!stillok) return SDL_FALSE;
if (offs >= MAX_BLOCK) return SDL_FALSE;
buf[offs++] = val&0xff;
return SDL_TRUE;
}
#define PUTDATA(data, size) ok=putdata(ok, data, size)
static SDL_bool putdata(SDL_bool stillok, unsigned char *data, Uint32 size)
{
if (!stillok) return SDL_FALSE;
if ((offs+size) > MAX_BLOCK) return SDL_FALSE;
memcpy( &buf[offs], data, size );
offs += size;
return SDL_TRUE;
}
#define PUTSTR(str) ok=putstr(ok, str)
static SDL_bool putstr(SDL_bool stillok, char *str)
{
if (!stillok) return SDL_FALSE;
stillok = putu32(stillok, (int)strlen(str)+1);
return putdata(stillok, (unsigned char *)str, (int)strlen(str)+1);
}
#define WRITEBLOCK() ok=writeblock(ok, f)
static SDL_bool writeblock(SDL_bool stillok, FILE *f)
{
if (!stillok) return SDL_FALSE;
if (offs <= 8) return SDL_TRUE; // No block to write
buf[4] = ((offs-8)>>24)&0xff;
buf[5] = ((offs-8)>>16)&0xff;
buf[6] = ((offs-8)>>8)&0xff;
buf[7] = (offs-8)&0xff;
stillok = (fwrite(buf, offs, 1, f) == 1);
offs = 0;
return stillok;
}
// ID must be 4 bytes long!
#define NEWBLOCK(id) ok=newblock(ok, id, f)
static SDL_bool newblock(SDL_bool stillok, char *id, FILE *f)
{
if (!stillok) return SDL_FALSE;
// Got an old block?
if (!writeblock(stillok, f)) return SDL_FALSE;
// Start a new one!
memcpy(buf, id, 4);
offs = 8;
return SDL_TRUE;
}
#define DATABLOCK(data, len) ok = datablock(ok, data, len, f)
static SDL_bool datablock(SDL_bool stillok, unsigned char *data, Uint32 len, FILE *f)
{
Uint32 lenbe = _BE32(len);
if (!stillok) return SDL_FALSE;
// Anything to write?
if (len == 0) return SDL_TRUE;
// Got an old block?
if (!writeblock(stillok, f)) return SDL_FALSE;
stillok = (fwrite("DATA", 4, 1, f) == 1);
stillok &= (fwrite(&lenbe, 4, 1, f) == 1);
stillok &= (fwrite(data, len, 1, f) == 1);
offs = 0;
return stillok;
}
SDL_bool save_snapshot(struct machine *oric, char *filename)
{
SDL_bool ok = SDL_TRUE;
struct m6502 *cpu = &oric->cpu;
SDL_bool do_wd17xx = SDL_FALSE;
int i, j;
FILE *f = NULL;
buf = malloc(MAX_BLOCK);
if (!buf)
{
msgbox(oric, MSGBOX_OK, "Snapshot failed: out of memory (1)\n");
return SDL_FALSE;
}
f = fopen(filename, "wb");
if (!f)
{
msgbox(oric, MSGBOX_OK, "Unable to create snapshot file (2)");
free(buf);
return SDL_FALSE;
}
NEWBLOCK("OSN\x00");
PUTU8(oric->type); // 0
PUTU32(oric->overclockmult); // 1
PUTU32(oric->overclockshift); // 5
PUTU16(oric->vsync); // 9
PUTU8(oric->romdis); // 11
PUTU8(oric->romon); // 12
PUTU8(oric->vsynchack); // 13
PUTU8(oric->drivetype); // 14
PUTU8(oric->tapeturbo); // 15
PUTU8(oric->vid_mode); // 16
PUTU32(oric->keymap); // 17 = 21
DATABLOCK(oric->mem, oric->memsize);
NEWBLOCK("TAP\x00");
PUTU8(oric->tapebit);
PUTU8(oric->tapeout);
PUTU8(oric->tapeparity);
PUTU32(oric->tapelen);
PUTU32(oric->tapeoffs);
PUTU32(oric->tapecount);
PUTU32(oric->tapetime);
PUTU32(oric->tapedupbytes);
PUTU32(oric->tapehdrend);
PUTU32(oric->tapedelay);
PUTU8(oric->tapemotor);
PUTU8(oric->tapeturbo_forceoff);
PUTU8(oric->rawtape);
PUTU32(oric->nonrawend);
PUTU32(oric->tapehitend);
PUTU32(oric->tapeturbo_syncstack);
DATABLOCK(oric->tapebuf, oric->tapelen);
// Patches
NEWBLOCK("PCH\0x00");
PUTU32(oric->pch_fd_cload_getname_pc);
PUTU32(oric->pch_fd_csave_getname_pc);
PUTU32(oric->pch_fd_store_getname_pc);
PUTU32(oric->pch_fd_recall_getname_pc);
PUTU32(oric->pch_fd_getname_addr);
PUTU8(oric->pch_fd_available);
PUTU32(oric->pch_tt_getsync_pc);
PUTU32(oric->pch_tt_getsync_end_pc);
PUTU32(oric->pch_tt_getsync_loop_pc);
PUTU32(oric->pch_tt_readbyte_pc);
PUTU32(oric->pch_tt_readbyte_end_pc);
PUTU32(oric->pch_tt_readbyte_storebyte_addr);
PUTU32(oric->pch_tt_readbyte_storezero_addr);
PUTU32(oric->pch_tt_putbyte_pc);
PUTU32(oric->pch_tt_putbyte_end_pc);
PUTU32(oric->pch_tt_csave_end_pc);
PUTU32(oric->pch_tt_store_end_pc);
PUTU32(oric->pch_tt_writeleader_pc);
PUTU32(oric->pch_tt_writeleader_end_pc);
PUTU8(oric->pch_tt_readbyte_setcarry);
PUTU8(oric->pch_tt_available);
PUTU8(oric->pch_tt_save_available);
// CPU
NEWBLOCK("CPU\x00");
PUTU32(cpu->cycles);
PUTU16(cpu->pc);
PUTU16(cpu->lastpc);
PUTU16(cpu->calcpc);
PUTU16(cpu->calcint);
PUTU8(cpu->nmi);
PUTU8(cpu->a);
PUTU8(cpu->x);
PUTU8(cpu->y);
PUTU8(cpu->sp);
PUTU8(MAKEFLAGS);
PUTU8(cpu->irq);
PUTU8(cpu->nmicount);
PUTU8(cpu->calcop);
// AY
NEWBLOCK("AY\x00\x00");
PUTU8(oric->ay.bmode);
PUTU8(oric->ay.creg);
PUTDATA(&oric->ay.eregs[0], NUM_AY_REGS);
for (i=0; i<8; i++)
PUTU8(oric->ay.keystates[i]);
for (i=0; i<3; i++)
PUTU32(oric->ay.toneper[i]);
PUTU32(oric->ay.noiseper);
PUTU32(oric->ay.envper);
for (i=0; i<3; i++)
{
PUTU16(oric->ay.tonebit[i]);
PUTU16(oric->ay.noisebit[i]);
PUTU16(oric->ay.vol[i]);
}
PUTU16(oric->ay.newout);
for (i=0; i<3; i++)
PUTU32(oric->ay.ct[i]);
PUTU32(oric->ay.ctn);
PUTU32(oric->ay.cte);
for (i=0; i<3; i++)
{
PUTU32(oric->ay.tonepos[i]);
PUTU32(oric->ay.tonestep[i]);
PUTU32(oric->ay.sign[i]);
PUTU32(oric->ay.out[i]);
}
PUTU32(oric->ay.envpos);
PUTU32(oric->ay.currnoise);
PUTU32(oric->ay.rndrack);
PUTU32(oric->ay.keybitdelay);
PUTU32(oric->ay.currkeyoffs);
// VIA
NEWBLOCK("VIA\x00");
PUTU8(oric->via.ifr);
PUTU8(oric->via.irb);
PUTU8(oric->via.orb);
PUTU8(oric->via.irbl);
PUTU8(oric->via.ira);
PUTU8(oric->via.ora);
PUTU8(oric->via.iral);
PUTU8(oric->via.ddra);
PUTU8(oric->via.ddrb);
PUTU8(oric->via.t1l_l);
PUTU8(oric->via.t1l_h);
PUTU16(oric->via.t1c);
PUTU8(oric->via.t2l_l);
PUTU8(oric->via.t2l_h);
PUTU16(oric->via.t2c);
PUTU8(oric->via.sr);
PUTU8(oric->via.acr);
PUTU8(oric->via.pcr);
PUTU8(oric->via.ier);
PUTU8(oric->via.ca1);
PUTU8(oric->via.ca2);
PUTU8(oric->via.cb1);
PUTU8(oric->via.cb2);
PUTU8(oric->via.srcount);
PUTU8(oric->via.t1reload);
PUTU8(oric->via.t2reload);
PUTU16(oric->via.srtime);
PUTU8(oric->via.t1run);
PUTU8(oric->via.t2run);
PUTU8(oric->via.ca2pulse);
PUTU8(oric->via.cb2pulse);
PUTU8(oric->via.srtrigger);
PUTU32(oric->via.irqbit);
switch (oric->drivetype)
{
case DRV_JASMIN:
NEWBLOCK("JSM\x00");
PUTU8(oric->jasmin.olay);
PUTU8(oric->jasmin.romdis);
do_wd17xx = SDL_TRUE;
break;
case DRV_MICRODISC:
NEWBLOCK("MDC\x00");
PUTU8(oric->md.status);
PUTU8(oric->md.intrq);
PUTU8(oric->md.drq);
PUTU8(oric->md.diskrom);
do_wd17xx = SDL_TRUE;
break;
case DRV_PRAVETZ:
{
Uint8 tmp[PRAV_TRACKS_PER_DISK*PRAV_RAW_TRACK_SIZE*2];
NEWBLOCK("PRV\x00");
PUTU8(oric->pravetz.olay); // 1
PUTU8(oric->pravetz.romdis); // 2
PUTU16(oric->pravetz.extension); // 4
PUTU8(oric->wddisk.c_drive); // 5
PUTU32(oric->wddisk.currentop); // 9
for (i=0; i<2; i++)
{
PUTU8(oric->pravetz.drv[i].volume); // +1
PUTU8(oric->pravetz.drv[i].select); // +2
PUTU8(oric->pravetz.drv[i].motor_on); // +3
PUTU8(oric->pravetz.drv[i].write_ready); // +4
PUTU16(oric->pravetz.drv[i].byte); // +6
PUTU16(oric->pravetz.drv[i].half_track); // +8
PUTU8(oric->pravetz.drv[i].dirty); // +9
PUTU8(oric->pravetz.drv[i].prot); // +10
}
/* Snapshot format is limited to one datablock per block, */
/* concatenate these into a temporary one... */
memcpy(tmp, &oric->pravetz.drv[0].image[0][0], PRAV_TRACKS_PER_DISK*PRAV_RAW_TRACK_SIZE);
memcpy(&tmp[PRAV_TRACKS_PER_DISK*PRAV_RAW_TRACK_SIZE], &oric->pravetz.drv[1].image[0][0], PRAV_TRACKS_PER_DISK*PRAV_RAW_TRACK_SIZE);
DATABLOCK(tmp, PRAV_TRACKS_PER_DISK*PRAV_RAW_TRACK_SIZE*2);
for (i=0; i<2; i++)
{
if ((oric->pravetz.drv[i].pimg == NULL) ||
(oric->pravetz.drv[i].pimg->rawimage == NULL))
break;
NEWBLOCK("PVD\x00");
PUTU16(i);
PUTU32(oric->wddisk.disk[i]->rawimagelen);
/* Convert sector_ptr to an offset */
if ((oric->pravetz.drv[i].sector_ptr == NULL) ||
(oric->pravetz.drv[i].pimg == NULL) ||
(oric->pravetz.drv[i].pimg->rawimage == NULL))
PUTU32(0xffffffff);
else
PUTU32((Uint32)(oric->pravetz.drv[i].sector_ptr - oric->pravetz.drv[i].pimg->rawimage));
DATABLOCK(oric->wddisk.disk[i]->rawimage, oric->wddisk.disk[i]->rawimagelen);
}
}
}
if( do_wd17xx )
{
NEWBLOCK("WDD\x00");
PUTU8(oric->wddisk.r_status);
PUTU8(oric->wddisk.r_track);
PUTU8(oric->wddisk.r_sector);
PUTU8(oric->wddisk.r_data);
PUTU8(oric->wddisk.c_drive);
PUTU8(oric->wddisk.c_side);
PUTU8(oric->wddisk.c_track);
PUTU8(oric->wddisk.c_sector);
PUTU8(oric->wddisk.sectype);
PUTU8(oric->wddisk.last_step_in);
PUTU32(oric->wddisk.currentop);
PUTU32(oric->wddisk.curroffs);
PUTU32(oric->wddisk.delayedint);
PUTU32(oric->wddisk.delayeddrq);
PUTU32(oric->wddisk.distatus);
PUTU32(oric->wddisk.ddstatus);
PUTU32(oric->wddisk.crc);
for (i=0; i<4; i++)
{
if( oric->wddisk.disk[i] )
{
NEWBLOCK("DSK\x00");
PUTU16(oric->wddisk.disk[i]->drivenum);
PUTU16(oric->wddisk.disk[i]->numtracks);
PUTU16(oric->wddisk.disk[i]->numsides);
PUTU16(oric->wddisk.disk[i]->geometry);
PUTU16(oric->wddisk.disk[i]->cachedtrack);
PUTU16(oric->wddisk.disk[i]->cachedside);
PUTU32(oric->wddisk.disk[i]->rawimagelen);
DATABLOCK(oric->wddisk.disk[i]->rawimage, oric->wddisk.disk[i]->rawimagelen);
}
}
}
if (oric->type == MACH_TELESTRAT)
{
// Bank info
NEWBLOCK("BNK\x00");
for (i=0; i<8; i++)
PUTU8(oric->tele_bank[i].type);
PUTU8(oric->tele_currbank);
// ACIA
NEWBLOCK("ACI\x00");
PUTDATA(&oric->tele_acia.regs[0], ACIA_LAST);
// VIA
NEWBLOCK("TVA\x00");
PUTU8(oric->tele_via.ifr);
PUTU8(oric->tele_via.irb);
PUTU8(oric->tele_via.orb);
PUTU8(oric->tele_via.irbl);
PUTU8(oric->tele_via.ira);
PUTU8(oric->tele_via.ora);
PUTU8(oric->tele_via.iral);
PUTU8(oric->tele_via.ddra);
PUTU8(oric->tele_via.ddrb);
PUTU8(oric->tele_via.t1l_l);
PUTU8(oric->tele_via.t1l_h);
PUTU16(oric->tele_via.t1c);
PUTU8(oric->tele_via.t2l_l);
PUTU8(oric->tele_via.t2l_h);
PUTU16(oric->tele_via.t2c);
PUTU8(oric->tele_via.sr);
PUTU8(oric->tele_via.acr);
PUTU8(oric->tele_via.pcr);
PUTU8(oric->tele_via.ier);
PUTU8(oric->tele_via.ca1);
PUTU8(oric->tele_via.ca2);
PUTU8(oric->tele_via.cb1);
PUTU8(oric->tele_via.cb2);
PUTU8(oric->tele_via.srcount);
PUTU8(oric->tele_via.t1reload);
PUTU8(oric->tele_via.t2reload);
PUTU16(oric->tele_via.srtime);
PUTU8(oric->tele_via.t1run);
PUTU8(oric->tele_via.t2run);
PUTU8(oric->tele_via.ca2pulse);
PUTU8(oric->tele_via.cb2pulse);
PUTU8(oric->tele_via.srtrigger);
PUTU32(oric->tele_via.irqbit);
}
// Symbols
if (oric->romsyms.numsyms)
{
NEWBLOCK("SYR\x00");
for (i=0; i<oric->romsyms.numsyms; i++)
{
PUTSTR(oric->romsyms.syms[i].name);
PUTU16(oric->romsyms.syms[i].addr);
PUTU16(oric->romsyms.syms[i].flags);
}
}
if (oric->usersyms.numsyms)
{
NEWBLOCK("SYU\x00");
for (i=0; i<oric->usersyms.numsyms; i++)
{
PUTSTR(oric->usersyms.syms[i].name);
PUTU16(oric->usersyms.syms[i].addr);
PUTU16(oric->usersyms.syms[i].flags);
}
}
if (oric->type == MACH_TELESTRAT)
{
for (j=0; j<8; j++)
{
if (oric->tele_banksyms[j].numsyms)
{
char name[8];
sprintf(name, "SY%d%c", j, 0);
NEWBLOCK(name);
for (i=0; i<oric->tele_banksyms[j].numsyms; i++)
{
PUTSTR(oric->tele_banksyms[j].syms[i].name);
PUTU16(oric->romsyms.syms[i].addr);
PUTU16(oric->romsyms.syms[i].flags);
}
}
}
}
// Breakpoints
if ((cpu->anybp) || (cpu->anymbp))
{
NEWBLOCK("BKP\x00");
for (i=0; i<16; i++)
PUTU32(cpu->breakpoints[i]);
for (i=0; i<16; i++)
{
PUTU8(cpu->membreakpoints[i].flags);
PUTU8(cpu->membreakpoints[i].lastval);
PUTU16(cpu->membreakpoints[i].addr);
}
}
WRITEBLOCK();
fclose(f);
free(buf);
if (!ok)
msgbox(oric, MSGBOX_OK, "Snapshot failed! (3)");
return ok;
}
struct blockheader
{
unsigned char id[4];
unsigned int offset;
unsigned int size;
unsigned char *buf;
struct blockheader *datablock;
int offs;
};
int numhdrs = 0;
static struct blockheader *bkh = NULL;
static SDL_bool getheaders(struct machine *oric, FILE *f)
{
int i;
unsigned int size, offset, filesize;
unsigned char hdr[8];
fseek(f, 0, SEEK_END);
filesize = (int)ftell(f);
fseek(f, 0, SEEK_SET);
/* First, find all the blocks in the file */
/* and make sure the file structure is sane. */
offset = 0;
numhdrs = 0;
while (offset < filesize)
{
if (fread(hdr, 8, 1, f) != 1)
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Read error (4)");
numhdrs = 0;
return SDL_FALSE;
}
size = (hdr[4]<<24)|(hdr[5]<<16)|(hdr[6]<<8)|hdr[7];
if ((size == 0) || ((offset+size) > filesize))
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file structure (5)");
numhdrs = 0;
return SDL_FALSE;
}
numhdrs++;
fseek(f, size, SEEK_CUR);
offset += size+8;
}
/* Allocate memory to store all the block headers */
bkh = (struct blockheader *)malloc(numhdrs*sizeof(struct blockheader));
if (!bkh)
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Out of memory (6)");
numhdrs = 0;
return SDL_FALSE;
}
memset(bkh, 0, numhdrs*sizeof(struct blockheader));
/* Now read in all the block headers */
fseek(f, 0, SEEK_SET);
offset = 0;
i = 0;
while (offset < filesize)
{
if (fread(hdr, 8, 1, f) != 1)
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Read error (7)");
free(bkh);
bkh = NULL;
numhdrs = 0;
return SDL_FALSE;
}
size = (hdr[4]<<24)|(hdr[5]<<16)|(hdr[6]<<8)|hdr[7];
if ((size == 0) || ((offset+size) > filesize))
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file structure (8)");
free(bkh);
bkh = NULL;
numhdrs = 0;
return SDL_FALSE;
}
offset+=8;
memcpy(bkh[i].id, hdr, 4);
bkh[i].offset = offset;
bkh[i].size = size;
//printf("Block: %c%c%c%c (@ %d, size %d)\n", bkh[i].id[0], bkh[i].id[1], (bkh[i].id[2]>31)?bkh[i].id[2]:'.', (bkh[i].id[3]>31)?bkh[i].id[3]:'.', bkh[i].offset, bkh[i].size);
if ((i>0) && (memcmp(bkh[i].id, "DATA", 4)==0))
{
bkh[i-1].datablock = &bkh[i];
}
fseek(f, size, SEEK_CUR);
offset += size;
i++;
}
return SDL_TRUE;
}
static void free_block(struct blockheader *blk)
{
if ((!blk)||(!blk->buf)) return;
free(blk->buf);
blk->buf = NULL;
}
static void free_blockheaders(void)
{
int i;
if (!bkh) return;
for (i=0; i<numhdrs; i++)
{
if (bkh[i].buf) free(bkh[i].buf);
}
free(bkh);
}
static struct blockheader *load_block(struct machine *oric, char *id, FILE *f, SDL_bool required, int expectedsize, SDL_bool datarequired)
{
int i;
for (i=0; i<numhdrs; i++)
{
if (memcmp(bkh[i].id, id, 4) == 0)
break;
}
if (i==numhdrs)
{
//printf("Unable to find %c%c%c%c\n", id[0], id[1], (id[2]>31)?id[2]:'.', (id[3]>31)?id[3]:'.');
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file (9)");
return NULL;
}
if ((datarequired) && (bkh[i].datablock == NULL))
{
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file (10)");
return NULL;
}
if ((expectedsize != -1) && (bkh[i].size != expectedsize))
{
//printf("Size for %c%c%c%c is %d, expected %d\n", id[0], id[1], (id[2]>31)?id[2]:'.', (id[3]>31)?id[3]:'.', bkh[i].size, expectedsize);
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file (11)");
return NULL;
}
/* Already loaded it?! */
if (bkh[i].buf)
{
bkh[i].offs = 0;
return &bkh[i];
}
bkh[i].buf = malloc(bkh[i].size);
if (!bkh[i].buf)
{
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Out of memory (12)");
return NULL;
}
fseek(f, bkh[i].offset, SEEK_SET);
if (fread(bkh[i].buf, bkh[i].size, 1, f) != 1)
{
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Read error (13)");
return NULL;
}
bkh[i].offs = 0;
return &bkh[i];
}
static SDL_bool read_block(struct machine *oric, struct blockheader *blk, FILE *f, SDL_bool required, unsigned char *destbuf)
{
if (!blk)
{
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Internal error (14)");
return SDL_FALSE;
}
if (blk->buf)
{
memcpy(destbuf, blk->buf, blk->size);
return SDL_TRUE;
}
fseek(f, blk->offset, SEEK_SET);
if (fread(destbuf, blk->size, 1, f) != 1)
{
if (required) msgbox(oric, MSGBOX_OK, "Snapshot load failed: Read error (15)");
return SDL_FALSE;
}
return SDL_TRUE;
}
static Uint32 getu32(struct blockheader *blk)
{
Uint32 val = (blk->buf[blk->offs]<<24)|(blk->buf[blk->offs+1]<<16)|(blk->buf[blk->offs+2]<<8)|blk->buf[blk->offs+3];
blk->offs+=4;
return val;
}
static Sint32 gets32(struct blockheader *blk)
{
Sint32 val = (blk->buf[blk->offs]<<24)|(blk->buf[blk->offs+1]<<16)|(blk->buf[blk->offs+2]<<8)|blk->buf[blk->offs+3];
blk->offs+=4;
return val;
}
static Uint16 getu16(struct blockheader *blk)
{
Uint16 val = (blk->buf[blk->offs]<<8)|blk->buf[blk->offs+1];
blk->offs+=2;
return val;
}
static Sint16 gets16(struct blockheader *blk)
{
Sint16 val = (blk->buf[blk->offs]<<8)|blk->buf[blk->offs+1];
blk->offs+=2;
return val;
}
static Uint8 getu8(struct blockheader *blk)
{
return blk->buf[blk->offs++];
}
static void getdata(struct blockheader *blk, unsigned char *dest, unsigned int size)
{
memcpy(dest, &blk->buf[blk->offs], size);
blk->offs += size;
}
SDL_bool load_snapshot(struct machine *oric, char *filename)
{
struct m6502 *cpu = &oric->cpu;
int i;
SDL_bool do_wd17xx = SDL_FALSE, back2mon = oric->emu_mode == EM_DEBUG;
unsigned int type, drivetype;
FILE *f = NULL;
struct blockheader *blk = NULL;
f = fopen(filename, "rb");
if (!f)
{
msgbox(oric, MSGBOX_OK, "Unable to open snapshot file (16)");
return SDL_FALSE;
}
if(!getheaders(oric, f))
{
fclose(f);
return SDL_FALSE;
}
/* Get the main block */
blk = load_block(oric, "OSN\x00", f, SDL_TRUE, 21, SDL_TRUE);
if (!blk)
{
free_blockheaders();
fclose(f);
return SDL_FALSE;
}
/* Set up the emulation for the required machine type */
type = blk->buf[0];
drivetype = blk->buf[14];
if (type >= MACH_LAST)
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file (17)");
free_blockheaders();
fclose(f);
return SDL_FALSE;
}
swapmach(oric, NULL, (drivetype<<16)|type);
/* Perform some validation */
if((oric->drivetype != drivetype) || // Unrecognised or invalid drive type
(oric->memsize != blk->datablock->size)) // Memsize incorrect for type
{
msgbox(oric, MSGBOX_OK, "Snapshot load failed: Invalid file (18)");
free_blockheaders();
fclose(f);
if (back2mon) setemumode(oric, NULL, EM_DEBUG);
return SDL_FALSE;
}
/* Read in the memory */
if (!read_block(oric, blk->datablock, f, SDL_TRUE, oric->mem))
{
free_blockheaders();
fclose(f);
if (back2mon) setemumode(oric, NULL, EM_DEBUG);
return SDL_FALSE;
}
/* Clear things that will get replaced */
clear_patches( oric );
if (oric->tapebuf)
{
free(oric->tapebuf);
oric->tapebuf = NULL;
oric->tapelen = 0;
}
blk->offs = 1;
oric->overclockmult = getu32(blk);
oric->overclockshift = getu32(blk);
oric->vsync = getu16(blk);
oric->romdis = getu8 (blk);
oric->romon = getu8 (blk);
oric->vsynchack = getu8 (blk);
blk->offs++; // Skip drivetype (already got it)
oric->tapeturbo = getu8 (blk);
oric->vid_mode = getu8 (blk);
oric->keymap = getu32(blk);
// Finished with this one
free_block(blk);
oric->vid_freq = oric->vid_mode&2;
if( oric->vid_mode & 4 )
{
oric->vid_addr = oric->vidbases[0];
oric->vid_ch_base = &oric->mem[oric->vidbases[1]];
} else {
oric->vid_addr = oric->vidbases[2];
oric->vid_ch_base = &oric->mem[oric->vidbases[3]];
}
/* Get the CPU block */
blk = load_block(oric, "CPU\x00", f, SDL_TRUE, 21, SDL_FALSE);
if (!blk)
{
free_blockheaders();
fclose(f);
setmenutoggles( oric );
if (back2mon) setemumode(oric, NULL, EM_DEBUG);
return SDL_FALSE;
}
cpu->cycles = getu32(blk);
cpu->pc = getu16(blk);
cpu->lastpc = getu16(blk);
cpu->calcpc = getu16(blk);
cpu->calcint = getu16(blk);
cpu->nmi = getu8 (blk);
cpu->a = getu8 (blk);
cpu->x = getu8 (blk);
cpu->y = getu8 (blk);
cpu->sp = getu8 (blk);
i = getu8 (blk);
SETFLAGS(i);
cpu->irq = getu8 (blk);
cpu->nmicount = getu8 (blk);
cpu->calcop = getu8 (blk);
// Finished with this one
free_block(blk);
/* Get the AY block */
blk = load_block(oric, "AY\x00\x00", f, SDL_TRUE, 153, SDL_FALSE);
if (!blk)
{
free_blockheaders();
fclose(f);
setmenutoggles( oric );
if (back2mon) setemumode(oric, NULL, EM_DEBUG);
return SDL_FALSE;
}
oric->ay.bmode = getu8(blk);
oric->ay.creg = getu8(blk);
getdata(blk, &oric->ay.eregs[0], NUM_AY_REGS);
memcpy(&oric->ay.regs[0], &oric->ay.eregs[0], NUM_AY_REGS);
for (i=0; i<8; i++)
oric->ay.keystates[i] = getu8(blk);
for (i=0; i<3; i++)
oric->ay.toneper[i] = getu32(blk);
oric->ay.noiseper = getu32(blk);
oric->ay.envper = getu32(blk);
for (i=0; i<3; i++)
{
oric->ay.tonebit[i] = getu16(blk);
oric->ay.noisebit[i] = getu16(blk);
oric->ay.vol[i] = getu16(blk);
}
oric->ay.newout = getu16(blk);
for (i=0; i<3; i++)
oric->ay.ct[i] = getu32(blk);
oric->ay.ctn = getu32(blk);
oric->ay.cte = getu32(blk);
for (i=0; i<3; i++)
{
oric->ay.tonepos[i] = getu32(blk);
oric->ay.tonestep[i] = getu32(blk);
oric->ay.sign[i] = getu32(blk);
oric->ay.out[i] = getu32(blk);
}
oric->ay.envpos = getu32(blk);
oric->ay.currnoise = getu32(blk);
oric->ay.rndrack = getu32(blk);
oric->ay.keybitdelay = getu32(blk);
oric->ay.currkeyoffs = getu32(blk);
// Finished with this one
free_block(blk);
/* Get the VIA block */
blk = load_block(oric, "VIA\x00", f, SDL_TRUE, 39, SDL_FALSE);
if (!blk)
{
free_blockheaders();
fclose(f);
setmenutoggles( oric );
if (back2mon) setemumode(oric, NULL, EM_DEBUG);
return SDL_FALSE;
}
oric->via.ifr = getu8 (blk);
oric->via.irb = getu8 (blk);
oric->via.orb = getu8 (blk);
oric->via.irbl = getu8 (blk);
oric->via.ira = getu8 (blk);
oric->via.ora = getu8 (blk);
oric->via.iral = getu8 (blk);
oric->via.ddra = getu8 (blk);
oric->via.ddrb = getu8 (blk);
oric->via.t1l_l = getu8 (blk);
oric->via.t1l_h = getu8 (blk);
oric->via.t1c = getu16(blk);
oric->via.t2l_l = getu8 (blk);
oric->via.t2l_h = getu8 (blk);
oric->via.t2c = getu16(blk);
oric->via.sr = getu8 (blk);
oric->via.acr = getu8 (blk);
oric->via.pcr = getu8 (blk);
oric->via.ier = getu8 (blk);
oric->via.ca1 = getu8 (blk);
oric->via.ca2 = getu8 (blk);
oric->via.cb1 = getu8 (blk);
oric->via.cb2 = getu8 (blk);
oric->via.srcount = getu8 (blk);
oric->via.t1reload = getu8 (blk);
oric->via.t2reload = getu8 (blk);
oric->via.srtime = getu16(blk);
oric->via.t1run = getu8 (blk);
oric->via.t2run = getu8 (blk);
oric->via.ca2pulse = getu8 (blk);
oric->via.cb2pulse = getu8 (blk);
oric->via.srtrigger= getu8 (blk);