mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-11-25 03:56:58 +01:00
451 lines
8.7 KiB
C++
451 lines
8.7 KiB
C++
/****************************************************************************
|
|
* Snes9x 1.51 Nintendo Wii/Gamecube Port
|
|
*
|
|
* Tantric October 2008
|
|
*
|
|
* patch.cpp
|
|
*
|
|
* IPS/UPS/PPF patch support
|
|
***************************************************************************/
|
|
|
|
#include <zlib.h>
|
|
|
|
#include "memmap.h"
|
|
|
|
#include "snes9xGX.h"
|
|
#include "menu.h"
|
|
#include "memfile.h"
|
|
#include "fileop.h"
|
|
#include "filebrowser.h"
|
|
|
|
static int readInt2(MFILE *f) {
|
|
int res = 0;
|
|
int c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
res = c;
|
|
c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
return c + (res << 8);
|
|
}
|
|
|
|
static int readInt3(MFILE *f) {
|
|
int res = 0;
|
|
int c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
res = c;
|
|
c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
res = c + (res << 8);
|
|
c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
return c + (res << 8);
|
|
}
|
|
|
|
static s64 readInt4(MFILE *f) {
|
|
s64 tmp, res = 0;
|
|
int c;
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
tmp = c;
|
|
res = res + (tmp << (i * 8));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static s64 readInt8(MFILE *f) {
|
|
s64 tmp, res = 0;
|
|
int c;
|
|
|
|
for (int i = 0; i < 8; i++) {
|
|
c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return -1;
|
|
tmp = c;
|
|
res = res + (tmp << (i * 8));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static s64 readVarPtr(MFILE *f) {
|
|
s64 offset = 0, shift = 1;
|
|
for (;;) {
|
|
int c = memfgetc(f);
|
|
if (c == MEOF)
|
|
return 0;
|
|
offset += (c & 0x7F) * shift;
|
|
if (c & 0x80)
|
|
break;
|
|
shift <<= 7;
|
|
offset += shift;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
#ifndef MIN
|
|
#define MIN(a,b) (((a)<(b))?(a):(b))
|
|
#endif
|
|
|
|
static uLong computePatchCRC(MFILE *f, unsigned int size) {
|
|
Bytef buf[4096];
|
|
long readed;
|
|
|
|
uLong crc = crc32(0L, Z_NULL, 0);
|
|
do {
|
|
readed = memfread(buf, 1, MIN(size, sizeof(buf)), f);
|
|
crc = crc32(crc, buf, readed);
|
|
size -= readed;
|
|
} while (readed > 0);
|
|
|
|
return crc;
|
|
}
|
|
|
|
bool patchApplyIPS(MFILE * f, u8 **r, int *s) {
|
|
// from the IPS spec at http://zerosoft.zophar.net/ips.htm
|
|
|
|
bool result = false;
|
|
|
|
u8 *rom = *r;
|
|
int size = *s;
|
|
if (memfgetc(f) == 'P' && memfgetc(f) == 'A' && memfgetc(f) == 'T'
|
|
&& memfgetc(f) == 'C' && memfgetc(f) == 'H') {
|
|
int b;
|
|
int offset;
|
|
int len;
|
|
|
|
result = true;
|
|
|
|
for (;;) {
|
|
// read offset
|
|
offset = readInt3(f);
|
|
// if offset == MEOF, end of patch
|
|
if (offset == 0x454f46 || offset == -1)
|
|
break;
|
|
// read length
|
|
len = readInt2(f);
|
|
if (!len) {
|
|
// len == 0, RLE block
|
|
len = readInt2(f);
|
|
// byte to fill
|
|
int c = memfgetc(f);
|
|
if (c == -1)
|
|
break;
|
|
b = (u8) c;
|
|
} else
|
|
b = -1;
|
|
// check if we need to reallocate our ROM
|
|
if ((offset + len) >= size) {
|
|
#ifdef NGC
|
|
size = offset + len;
|
|
#else
|
|
size *= 2;
|
|
rom = (u8 *) realloc(rom, size);
|
|
#endif
|
|
*r = rom;
|
|
*s = size;
|
|
}
|
|
if (b == -1) {
|
|
// normal block, just read the data
|
|
if (memfread(&rom[offset], 1, len, f) != (size_t) len)
|
|
break;
|
|
} else {
|
|
// fill the region with the given byte
|
|
while (len--) {
|
|
rom[offset++] = b;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
bool patchApplyUPS(MFILE * f, u8 **rom, int *size) {
|
|
|
|
s64 srcCRC, dstCRC, patchCRC;
|
|
|
|
memfseek(f, 0, MSEEK_END);
|
|
long int patchSize = memftell(f);
|
|
if (patchSize < 20) {
|
|
return false;
|
|
}
|
|
|
|
memfseek(f, 0, MSEEK_SET);
|
|
|
|
if (memfgetc(f) != 'U' || memfgetc(f) != 'P' || memfgetc(f) != 'S'
|
|
|| memfgetc(f) != '1') {
|
|
return false;
|
|
}
|
|
|
|
memfseek(f, -12, MSEEK_END);
|
|
srcCRC = readInt4(f);
|
|
dstCRC = readInt4(f);
|
|
patchCRC = readInt4(f);
|
|
if (srcCRC == -1 || dstCRC == -1 || patchCRC == -1) {
|
|
return false;
|
|
}
|
|
|
|
memfseek(f, 0, MSEEK_SET);
|
|
u32 crc = computePatchCRC(f, patchSize - 4);
|
|
|
|
if (crc != patchCRC) {
|
|
return false;
|
|
}
|
|
|
|
crc = crc32(0L, Z_NULL, 0);
|
|
crc = crc32(crc, *rom, *size);
|
|
|
|
memfseek(f, 4, MSEEK_SET);
|
|
s64 dataSize;
|
|
s64 srcSize = readVarPtr(f);
|
|
s64 dstSize = readVarPtr(f);
|
|
|
|
if (crc == srcCRC) {
|
|
dataSize = srcSize;
|
|
} else if (crc == dstCRC) {
|
|
dataSize = dstSize;
|
|
} else {
|
|
return false;
|
|
}
|
|
if (dataSize != *size) {
|
|
return false;
|
|
}
|
|
|
|
s64 relative = 0;
|
|
u8 *mem;
|
|
while (memftell(f) < patchSize - 12) {
|
|
relative += readVarPtr(f);
|
|
if (relative > dataSize)
|
|
continue;
|
|
mem = *rom + relative;
|
|
for (s64 i = relative; i < dataSize; i++) {
|
|
int x = memfgetc(f);
|
|
relative++;
|
|
if (!x)
|
|
break;
|
|
if (i < dataSize) {
|
|
*mem++ ^= x;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int ppfVersion(MFILE *f) {
|
|
memfseek(f, 0, MSEEK_SET);
|
|
if (memfgetc(f) != 'P' || memfgetc(f) != 'P' || memfgetc(f) != 'F')
|
|
return 0;
|
|
switch (memfgetc(f)) {
|
|
case '1':
|
|
return 1;
|
|
case '2':
|
|
return 2;
|
|
case '3':
|
|
return 3;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int ppfFileIdLen(MFILE *f, int version) {
|
|
if (version == 2) {
|
|
memfseek(f, -8, MSEEK_END);
|
|
} else {
|
|
memfseek(f, -6, MSEEK_END);
|
|
}
|
|
|
|
if (memfgetc(f) != '.' || memfgetc(f) != 'D' || memfgetc(f) != 'I'
|
|
|| memfgetc(f) != 'Z')
|
|
return 0;
|
|
|
|
return (version == 2) ? readInt4(f) : readInt2(f);
|
|
}
|
|
|
|
static bool patchApplyPPF1(MFILE *f, u8 **rom, int *size) {
|
|
memfseek(f, 0, MSEEK_END);
|
|
int count = memftell(f);
|
|
if (count < 56)
|
|
return false;
|
|
count -= 56;
|
|
|
|
memfseek(f, 56, MSEEK_SET);
|
|
|
|
u8 *mem = *rom;
|
|
|
|
while (count > 0) {
|
|
int offset = readInt4(f);
|
|
if (offset == -1)
|
|
break;
|
|
int len = memfgetc(f);
|
|
if (len == MEOF)
|
|
break;
|
|
if (offset + len > *size)
|
|
break;
|
|
if (memfread(&mem[offset], 1, len, f) != (size_t) len)
|
|
break;
|
|
count -= 4 + 1 + len;
|
|
}
|
|
|
|
return (count == 0);
|
|
}
|
|
|
|
static bool patchApplyPPF2(MFILE *f, u8 **rom, int *size) {
|
|
memfseek(f, 0, MSEEK_END);
|
|
int count = memftell(f);
|
|
if (count < 56 + 4 + 1024)
|
|
return false;
|
|
count -= 56 + 4 + 1024;
|
|
|
|
memfseek(f, 56, MSEEK_SET);
|
|
|
|
int datalen = readInt4(f);
|
|
if (datalen != *size)
|
|
return false;
|
|
|
|
u8 *mem = *rom;
|
|
|
|
u8 block[1024];
|
|
memfread(&block, 1, 1024, f);
|
|
if (memcmp(&mem[0x9320], &block, 1024) != 0)
|
|
return false;
|
|
|
|
int idlen = ppfFileIdLen(f, 2);
|
|
if (idlen > 0)
|
|
count -= 16 + 16 + idlen;
|
|
|
|
memfseek(f, 56 + 4 + 1024, MSEEK_SET);
|
|
|
|
while (count > 0) {
|
|
int offset = readInt4(f);
|
|
if (offset == -1)
|
|
break;
|
|
int len = memfgetc(f);
|
|
if (len == MEOF)
|
|
break;
|
|
if (offset + len > *size)
|
|
break;
|
|
if (memfread(&mem[offset], 1, len, f) != (size_t) len)
|
|
break;
|
|
count -= 4 + 1 + len;
|
|
}
|
|
|
|
return (count == 0);
|
|
}
|
|
|
|
static bool patchApplyPPF3(MFILE *f, u8 **rom, int *size) {
|
|
memfseek(f, 0, MSEEK_END);
|
|
int count = memftell(f);
|
|
if (count < 56 + 4 + 1024)
|
|
return false;
|
|
count -= 56 + 4;
|
|
|
|
memfseek(f, 56, MSEEK_SET);
|
|
|
|
int imagetype = memfgetc(f);
|
|
int blockcheck = memfgetc(f);
|
|
int undo = memfgetc(f);
|
|
memfgetc(f);
|
|
|
|
u8 *mem = *rom;
|
|
|
|
if (blockcheck) {
|
|
u8 block[1024];
|
|
memfread(&block, 1, 1024, f);
|
|
if (memcmp(&mem[(imagetype == 0) ? 0x9320 : 0x80A0], &block, 1024) != 0)
|
|
return false;
|
|
count -= 1024;
|
|
}
|
|
|
|
int idlen = ppfFileIdLen(f, 2);
|
|
if (idlen > 0)
|
|
count -= 16 + 16 + idlen;
|
|
|
|
memfseek(f, 56 + 4 + (blockcheck ? 1024 : 0), MSEEK_SET);
|
|
|
|
while (count > 0) {
|
|
s64 offset = readInt8(f);
|
|
if (offset == -1)
|
|
break;
|
|
int len = memfgetc(f);
|
|
if (len == MEOF)
|
|
break;
|
|
if (offset + len > *size)
|
|
break;
|
|
if (memfread(&mem[offset], 1, len, f) != (size_t) len)
|
|
break;
|
|
if (undo)
|
|
memfseek(f, len, MSEEK_CUR);
|
|
count -= 8 + 1 + len;
|
|
if (undo)
|
|
count -= len;
|
|
}
|
|
|
|
return (count == 0);
|
|
}
|
|
|
|
bool patchApplyPPF(MFILE *f, u8 **rom, int *size)
|
|
{
|
|
bool res = false;
|
|
|
|
int version = ppfVersion(f);
|
|
switch (version)
|
|
{
|
|
case 1: res = patchApplyPPF1(f, rom, size); break;
|
|
case 2: res = patchApplyPPF2(f, rom, size); break;
|
|
case 3: res = patchApplyPPF3(f, rom, size); break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void LoadPatch(int method)
|
|
{
|
|
int patchsize = 0;
|
|
int patchtype;
|
|
char patchpath[3][512];
|
|
|
|
AllocSaveBuffer ();
|
|
|
|
memset(patchpath, 0, sizeof(patchpath));
|
|
sprintf(patchpath[0], "%s/%s.ips", browser.dir, Memory.ROMFilename);
|
|
sprintf(patchpath[1], "%s/%s.ups", browser.dir, Memory.ROMFilename);
|
|
sprintf(patchpath[2], "%s/%s.ppf", browser.dir, Memory.ROMFilename);
|
|
|
|
for(patchtype=0; patchtype<3; patchtype++)
|
|
{
|
|
patchsize = LoadFile(patchpath[patchtype], method, SILENT);
|
|
|
|
if(patchsize)
|
|
break;
|
|
}
|
|
|
|
if(patchsize > 0)
|
|
{
|
|
// create memory file
|
|
MFILE * mf = memfopen((char *)savebuffer, patchsize);
|
|
|
|
int tmpSize = SNESROMSize;
|
|
|
|
if(patchtype == 0)
|
|
patchApplyIPS(mf, &Memory.ROM, &tmpSize);
|
|
else if(patchtype == 1)
|
|
patchApplyUPS(mf, &Memory.ROM, &tmpSize);
|
|
else
|
|
patchApplyPPF(mf, &Memory.ROM, &tmpSize);
|
|
|
|
SNESROMSize = tmpSize;
|
|
|
|
memfclose(mf); // close memory file
|
|
}
|
|
|
|
FreeSaveBuffer ();
|
|
}
|