mirror of
https://github.com/kanjitalk755/macemu.git
synced 2025-01-11 10:30:09 +00:00
Add support to decode parcels-based ROMs
- include/rom_patches.h (DecodeROM): Declare. - rom_patches.cpp (DecodeROM): Define. - Unix/main_unix.cpp, BeOS/main_beos.cpp (decode_lzss): Move to... - rom_patches.cpp (decode_lzss): ... here. - Unix/main_unix.cpp (main): Call DecodeROM(). - BeOS/main_beos.cpp (SheepShaver::load_rom): Call DecodeROM().
This commit is contained in:
gbeauche
parent
05d3e990a5
commit
665c64b4aa
@ -736,49 +736,6 @@ void SheepShaver::init_rom(void)
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* file_read_error: Cannot read ROM file
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*/
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// Decode LZSS data
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static void decode_lzss(const uint8 *src, uint8 *dest, int size)
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{
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char dict[0x1000];
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int run_mask = 0, dict_idx = 0xfee;
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for (;;) {
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if (run_mask < 0x100) {
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// Start new run
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if (--size < 0)
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break;
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run_mask = *src++ | 0xff00;
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}
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bool bit = run_mask & 1;
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run_mask >>= 1;
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if (bit) {
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// Verbatim copy
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if (--size < 0)
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break;
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int c = *src++;
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dict[dict_idx++] = c;
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*dest++ = c;
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dict_idx &= 0xfff;
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} else {
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// Copy from dictionary
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if (--size < 0)
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break;
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int idx = *src++;
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if (--size < 0)
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break;
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int cnt = *src++;
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idx |= (cnt << 4) & 0xf00;
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cnt = (cnt & 0x0f) + 3;
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while (cnt--) {
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char c = dict[idx++];
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dict[dict_idx++] = c;
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*dest++ = c;
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idx &= 0xfff;
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dict_idx &= 0xfff;
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}
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}
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}
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}
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void SheepShaver::load_rom(void)
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{
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// Get rom file path from preferences
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@ -807,39 +764,15 @@ void SheepShaver::load_rom(void)
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uint8 *rom = new uint8[ROM_SIZE]; // Reading directly into the area doesn't work
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ssize_t actual = file.Read((void *)rom, ROM_SIZE);
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if (actual == ROM_SIZE) {
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// Plain ROM image
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memcpy((void *)ROM_BASE, rom, ROM_SIZE);
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delete[] rom;
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} else {
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if (strncmp((char *)rom, "<CHRP-BOOT>", 11) == 0) {
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// CHRP compressed ROM image
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D(bug("CHRP ROM image\n"));
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uint32 lzss_offset, lzss_size;
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char *s = strstr((char *)rom, "constant lzss-offset");
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if (s == NULL)
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throw rom_size_error();
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s -= 7;
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if (sscanf(s, "%06lx", &lzss_offset) != 1)
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throw rom_size_error();
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s = strstr((char *)rom, "constant lzss-size");
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if (s == NULL)
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throw rom_size_error();
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s -= 7;
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if (sscanf(s, "%06lx", &lzss_size) != 1)
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throw rom_size_error();
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D(bug("Offset of compressed data: %08lx\n", lzss_offset));
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D(bug("Size of compressed data: %08lx\n", lzss_size));
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D(bug("Uncompressing ROM...\n"));
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decode_lzss(rom + lzss_offset, (uint8 *)ROM_BASE, lzss_size);
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delete[] rom;
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} else if (rom_size != 4*1024*1024)
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// Decode Mac ROM
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if (!DecodeROM(rom, actual)) {
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if (rom_size != 4*1024*1024)
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throw rom_size_error();
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else
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throw file_read_error();
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}
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delete[] rom;
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}
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@ -263,50 +263,6 @@ extern void paranoia_check(void);
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#endif
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// Decode LZSS data
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static void decode_lzss(const uint8 *src, uint8 *dest, int size)
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{
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char dict[0x1000];
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int run_mask = 0, dict_idx = 0xfee;
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for (;;) {
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if (run_mask < 0x100) {
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// Start new run
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if (--size < 0)
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break;
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run_mask = *src++ | 0xff00;
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}
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bool bit = run_mask & 1;
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run_mask >>= 1;
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if (bit) {
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// Verbatim copy
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if (--size < 0)
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break;
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int c = *src++;
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dict[dict_idx++] = c;
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*dest++ = c;
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dict_idx &= 0xfff;
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} else {
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// Copy from dictionary
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if (--size < 0)
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break;
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int idx = *src++;
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if (--size < 0)
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break;
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int cnt = *src++;
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idx |= (cnt << 4) & 0xf00;
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cnt = (cnt & 0x0f) + 3;
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while (cnt--) {
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char c = dict[idx++];
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dict[dict_idx++] = c;
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*dest++ = c;
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idx &= 0xfff;
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dict_idx &= 0xfff;
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}
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}
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}
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}
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/*
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* Main program
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*/
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@ -540,43 +496,10 @@ int main(int argc, char **argv)
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rom_tmp = new uint8[ROM_SIZE];
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actual = read(rom_fd, (void *)rom_tmp, ROM_SIZE);
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close(rom_fd);
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if (actual == ROM_SIZE) {
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// Plain ROM image
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memcpy((void *)ROM_BASE, rom_tmp, ROM_SIZE);
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delete[] rom_tmp;
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} else {
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if (strncmp((char *)rom_tmp, "<CHRP-BOOT>", 11) == 0) {
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// CHRP compressed ROM image
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D(bug("CHRP ROM image\n"));
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uint32 lzss_offset, lzss_size;
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char *s = strstr((char *)rom_tmp, "constant lzss-offset");
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if (s == NULL) {
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ErrorAlert(GetString(STR_ROM_SIZE_ERR));
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goto quit;
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}
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s -= 7;
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if (sscanf(s, "%06x", &lzss_offset) != 1) {
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ErrorAlert(GetString(STR_ROM_SIZE_ERR));
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goto quit;
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}
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s = strstr((char *)rom_tmp, "constant lzss-size");
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if (s == NULL) {
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ErrorAlert(GetString(STR_ROM_SIZE_ERR));
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goto quit;
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}
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s -= 7;
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if (sscanf(s, "%06x", &lzss_size) != 1) {
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ErrorAlert(GetString(STR_ROM_SIZE_ERR));
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goto quit;
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}
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D(bug("Offset of compressed data: %08x\n", lzss_offset));
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D(bug("Size of compressed data: %08x\n", lzss_size));
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D(bug("Uncompressing ROM...\n"));
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decode_lzss(rom_tmp + lzss_offset, (uint8 *)ROM_BASE, lzss_size);
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delete[] rom_tmp;
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} else if (rom_size != 4*1024*1024) {
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// Decode Mac ROM
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if (!DecodeROM(rom_tmp, actual)) {
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if (rom_size != 4*1024*1024) {
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ErrorAlert(GetString(STR_ROM_SIZE_ERR));
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goto quit;
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} else {
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@ -584,6 +507,7 @@ int main(int argc, char **argv)
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goto quit;
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}
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}
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delete[] rom_tmp;
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// Load NVRAM
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XPRAMInit();
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@ -31,6 +31,7 @@ enum {
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};
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extern int ROMType;
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extern bool DecodeROM(uint8 *data, uint32 size);
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extern bool PatchROM(void);
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extern void InstallDrivers(void);
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@ -74,6 +74,129 @@ static bool patch_nanokernel(void);
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static bool patch_68k(void);
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// Decode LZSS data
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static void decode_lzss(const uint8 *src, uint8 *dest, int size)
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{
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char dict[0x1000];
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int run_mask = 0, dict_idx = 0xfee;
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for (;;) {
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if (run_mask < 0x100) {
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// Start new run
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if (--size < 0)
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break;
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run_mask = *src++ | 0xff00;
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}
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bool bit = run_mask & 1;
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run_mask >>= 1;
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if (bit) {
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// Verbatim copy
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if (--size < 0)
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break;
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int c = *src++;
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dict[dict_idx++] = c;
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*dest++ = c;
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dict_idx &= 0xfff;
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} else {
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// Copy from dictionary
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if (--size < 0)
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break;
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int idx = *src++;
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if (--size < 0)
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break;
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int cnt = *src++;
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idx |= (cnt << 4) & 0xf00;
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cnt = (cnt & 0x0f) + 3;
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while (cnt--) {
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char c = dict[idx++];
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dict[dict_idx++] = c;
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*dest++ = c;
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idx &= 0xfff;
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dict_idx &= 0xfff;
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}
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}
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}
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}
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// Decode parcels of ROM image (MacOS 9.X and even earlier)
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void decode_parcels(const uint8 *src, uint8 *dest, int size)
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{
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uint32 parcel_offset = 0x14;
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D(bug("Offset Type Name\n"));
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while (parcel_offset != 0) {
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const uint32 *parcel_data = (uint32 *)(src + parcel_offset);
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parcel_offset = ntohl(parcel_data[0]);
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uint32 parcel_type = ntohl(parcel_data[1]);
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D(bug("%08x %c%c%c%c %s\n", parcel_offset,
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(parcel_type >> 24) & 0xff, (parcel_type >> 16) & 0xff,
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(parcel_type >> 8) & 0xff, parcel_type & 0xff, &parcel_data[6]));
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if (parcel_type == FOURCC('r','o','m',' ')) {
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uint32 lzss_offset = ntohl(parcel_data[2]);
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uint32 lzss_size = ((uint32)src + parcel_offset) - ((uint32)parcel_data + lzss_offset);
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decode_lzss((uint8 *)parcel_data + lzss_offset, dest, lzss_size);
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}
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}
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}
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/*
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* Decode ROM image, 4 MB plain images or NewWorld images
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*/
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bool DecodeROM(uint8 *data, uint32 size)
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{
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if (size == ROM_SIZE) {
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// Plain ROM image
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memcpy((void *)ROM_BASE, data, ROM_SIZE);
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return true;
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}
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else if (strncmp((char *)data, "<CHRP-BOOT>", 11) == 0) {
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// CHRP compressed ROM image
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uint32 image_offset, image_size;
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bool decode_info_ok = false;
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char *s = strstr((char *)data, "constant lzss-offset");
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if (s != NULL) {
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// Probably a plain LZSS compressed ROM image
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if (sscanf(s - 7, "%06x", &image_offset) == 1) {
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s = strstr((char *)data, "constant lzss-size");
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if (s != NULL && (sscanf(s - 7, "%06x", &image_size) == 1))
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decode_info_ok = true;
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}
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}
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else {
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// Probably a MacOS 9.2.x ROM image
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s = strstr((char *)data, "constant parcels-offset");
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if (s != NULL) {
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if (sscanf(s - 7, "%06x", &image_offset) == 1) {
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s = strstr((char *)data, "constant parcels-size");
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if (s != NULL && (sscanf(s - 7, "%06x", &image_size) == 1))
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decode_info_ok = true;
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}
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}
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}
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// No valid information to decode the ROM found?
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if (!decode_info_ok)
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return false;
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// Check signature, this could be a parcels-based ROM image
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uint32 rom_signature = ntohl(*(uint32 *)(data + image_offset));
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if (rom_signature == FOURCC('p','r','c','l')) {
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D(bug("Offset of parcels data: %08x\n", image_offset));
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D(bug("Size of parcels data: %08x\n", image_size));
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decode_parcels(data + image_offset, (uint8 *)ROM_BASE, image_size);
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}
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else {
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D(bug("Offset of compressed data: %08x\n", image_offset));
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D(bug("Size of compressed data: %08x\n", image_size));
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decode_lzss(data + image_offset, (uint8 *)ROM_BASE, image_size);
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}
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return true;
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}
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return false;
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}
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/*
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* Search ROM for byte string, return ROM offset (or 0)
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*/
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