mirror of https://github.com/snes9xgit/snes9x.git
Don't allocate 8MB for patching.
This commit is contained in:
BearOso
parent
2fb67c7329
commit
08bf7a8696
95
memmap.cpp
95
memmap.cpp
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@ -3470,6 +3470,33 @@ static uint32 XPSdecode (const uint8 *data, unsigned &addr, unsigned size)
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return offset;
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}
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static std::vector<uint8_t> ReadStreamUntilEOF(Stream *r)
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{
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const size_t max_buffer_size = 4096;
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std::vector<uint8_t> data;
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uint8_t buffer[max_buffer_size];
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size_t total_size = 0;
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size_t buffer_size = 0;
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int value = 0;
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while (value != EOF)
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{
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value = r->get_char();
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if (value != EOF)
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buffer[buffer_size++] = value;
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if (buffer_size == max_buffer_size || (value == EOF && buffer_size > 0))
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{
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data.resize(data.size() + buffer_size);
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memcpy(&data[total_size], buffer, buffer_size);
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total_size += buffer_size;
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buffer_size = 0;
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}
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}
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return data;
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}
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//NOTE: UPS patches are *never* created against a headered ROM!
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//this is per the UPS file specification. however, do note that it is
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//technically possible for a non-compliant patcher to ignore this requirement.
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@ -3482,40 +3509,28 @@ static uint32 XPSdecode (const uint8 *data, unsigned &addr, unsigned size)
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static bool8 ReadUPSPatch (Stream *r, long, int32 &rom_size)
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{
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//Reader lacks size() and rewind(), so we need to read in the file to get its size
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uint8 *data = new uint8[8 * 1024 * 1024]; //allocate a lot of memory, better safe than sorry ...
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uint32 size = 0;
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while(true) {
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int value = r->get_char();
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if(value == EOF) break;
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data[size++] = value;
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if(size >= 8 * 1024 * 1024) {
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//prevent buffer overflow: SNES-made UPS patches should never be this big anyway ...
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delete[] data;
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return false;
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}
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}
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auto data_vector = ReadStreamUntilEOF(r);
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uint8 *data = &data_vector[0];
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uint32 size = data_vector.size();
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//4-byte header + 1-byte input size + 1-byte output size + 4-byte patch CRC32 + 4-byte unpatched CRC32 + 4-byte patched CRC32
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if(size < 18) { delete[] data; return false; } //patch is too small
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if(size < 18) return false; //patch is too small
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uint32 addr = 0;
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if(data[addr++] != 'U') { delete[] data; return false; } //patch has an invalid header
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if(data[addr++] != 'P') { delete[] data; return false; } //...
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if(data[addr++] != 'S') { delete[] data; return false; } //...
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if(data[addr++] != '1') { delete[] data; return false; } //...
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uint32 addr = 4;
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if (memcmp(data, "UPS1", 4) != 0) return false; //patch has an invalid header
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uint32 patch_crc32 = caCRC32(data, size - 4); //don't include patch CRC32 itself in CRC32 calculation
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uint32 rom_crc32 = caCRC32(Memory.ROM, rom_size);
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uint32 px_crc32 = (data[size - 12] << 0) + (data[size - 11] << 8) + (data[size - 10] << 16) + (data[size - 9] << 24);
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uint32 py_crc32 = (data[size - 8] << 0) + (data[size - 7] << 8) + (data[size - 6] << 16) + (data[size - 5] << 24);
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uint32 pp_crc32 = (data[size - 4] << 0) + (data[size - 3] << 8) + (data[size - 2] << 16) + (data[size - 1] << 24);
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if(patch_crc32 != pp_crc32) { delete[] data; return false; } //patch is corrupted
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if(!Settings.IgnorePatchChecksum && (rom_crc32 != px_crc32) && (rom_crc32 != py_crc32)) { delete[] data; return false; } //patch is for a different ROM
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if(patch_crc32 != pp_crc32) { return false; } //patch is corrupted
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if(!Settings.IgnorePatchChecksum && (rom_crc32 != px_crc32) && (rom_crc32 != py_crc32)) return false; //patch is for a different ROM
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uint32 px_size = XPSdecode(data, addr, size);
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uint32 py_size = XPSdecode(data, addr, size);
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uint32 out_size = ((uint32) rom_size == px_size) ? py_size : px_size;
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if(out_size > CMemory::MAX_ROM_SIZE) { delete[] data; return false; } //applying this patch will overflow Memory.ROM buffer
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if(out_size > CMemory::MAX_ROM_SIZE) { return false; } //applying this patch will overflow Memory.ROM buffer
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//fill expanded area with 0x00s; so that XORing works as expected below.
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//note that this is needed (and works) whether output ROM is larger or smaller than pre-patched ROM
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@ -3534,7 +3549,6 @@ static bool8 ReadUPSPatch (Stream *r, long, int32 &rom_size)
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}
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rom_size = out_size;
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delete[] data;
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uint32 out_crc32 = caCRC32(Memory.ROM, rom_size);
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if(Settings.IgnorePatchChecksum
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@ -3565,48 +3579,37 @@ static bool8 ReadUPSPatch (Stream *r, long, int32 &rom_size)
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//
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static bool8 ReadBPSPatch (Stream *r, long, int32 &rom_size)
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{
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uint8 *data = new uint8[8 * 1024 * 1024]; //allocate a lot of memory, better safe than sorry ...
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uint32 size = 0;
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while(true) {
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int value = r->get_char();
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if(value == EOF) break;
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data[size++] = value;
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if(size >= 8 * 1024 * 1024) {
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//prevent buffer overflow: SNES-made BPS patches should never be this big anyway ...
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delete[] data;
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return false;
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}
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}
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auto data_vector = ReadStreamUntilEOF(r);
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uint8 *data = &data_vector[0];
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uint32 size = data_vector.size();
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/* 4-byte header + 1-byte input size + 1-byte output size + 1-byte metadata size
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+ 4-byte unpatched CRC32 + 4-byte patched CRC32 + 4-byte patch CRC32 */
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if(size < 19) { delete[] data; return false; } //patch is too small
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if(size < 19) return false; //patch is too small
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uint32 addr = 0;
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if(data[addr++] != 'B') { delete[] data; return false; } //patch has an invalid header
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if(data[addr++] != 'P') { delete[] data; return false; } //...
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if(data[addr++] != 'S') { delete[] data; return false; } //...
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if(data[addr++] != '1') { delete[] data; return false; } //...
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uint32 addr = 4;
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if (memcmp(data, "BPS1", 4) != 0) return false; //patch has an invalid header
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uint32 patch_crc32 = caCRC32(data, size - 4); //don't include patch CRC32 itself in CRC32 calculation
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uint32 rom_crc32 = caCRC32(Memory.ROM, rom_size);
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uint32 source_crc32 = (data[size - 12] << 0) + (data[size - 11] << 8) + (data[size - 10] << 16) + (data[size - 9] << 24);
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uint32 target_crc32 = (data[size - 8] << 0) + (data[size - 7] << 8) + (data[size - 6] << 16) + (data[size - 5] << 24);
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uint32 pp_crc32 = (data[size - 4] << 0) + (data[size - 3] << 8) + (data[size - 2] << 16) + (data[size - 1] << 24);
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if(patch_crc32 != pp_crc32) { delete[] data; return false; } //patch is corrupted
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if(!Settings.IgnorePatchChecksum && rom_crc32 != source_crc32) { delete[] data; return false; } //patch is for a different ROM
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if(patch_crc32 != pp_crc32) return false; //patch is corrupted
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if(!Settings.IgnorePatchChecksum && rom_crc32 != source_crc32) return false; //patch is for a different ROM
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XPSdecode(data, addr, size);
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uint32 target_size = XPSdecode(data, addr, size);
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uint32 metadata_size = XPSdecode(data, addr, size);
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addr += metadata_size;
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if(target_size > CMemory::MAX_ROM_SIZE) { delete[] data; return false; } //applying this patch will overflow Memory.ROM buffer
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if(target_size > CMemory::MAX_ROM_SIZE) return false; //applying this patch will overflow Memory.ROM buffer
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enum { SourceRead, TargetRead, SourceCopy, TargetCopy };
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uint32 outputOffset = 0, sourceRelativeOffset = 0, targetRelativeOffset = 0;
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uint8 *patched_rom = new uint8[target_size];
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std::vector<uint8_t> patched_rom_vector(target_size);
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uint8 *patched_rom = &patched_rom_vector[0];
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memset(patched_rom, 0, target_size);
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while(addr < size - 12) {
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@ -3642,17 +3645,13 @@ static bool8 ReadBPSPatch (Stream *r, long, int32 &rom_size)
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}
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}
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delete[] data;
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uint32 out_crc32 = caCRC32(patched_rom, target_size);
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if(Settings.IgnorePatchChecksum || out_crc32 == target_crc32) {
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memcpy(Memory.ROM, patched_rom, target_size);
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rom_size = target_size;
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delete[] patched_rom;
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Settings.IsPatched = 2;
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return true;
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} else {
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delete[] patched_rom;
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fprintf(stderr, "WARNING: BPS patching failed.\nROM has not been altered.\n");
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return false;
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}
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