bool GBLoadROM(struct GB* gb, struct VFile* vf) {
GBUnloadROM(gb);
gb->romVf = vf;
gb->pristineRomSize = vf->size(vf);
vf->seek(vf, 0, SEEK_SET);
#ifdef _3DS
gb->pristineRom = 0;
if (gb->pristineRomSize <= romBufferSize) {
gb->pristineRom = romBuffer;
vf->read(vf, romBuffer, gb->pristineRomSize);
}
#else
gb->pristineRom = vf->map(vf, gb->pristineRomSize, MAP_READ);
#endif
if (!gb->pristineRom) {
return false;
}
gb->yankedRomSize = 0;
gb->memory.rom = gb->pristineRom;
gb->memory.romSize = gb->pristineRomSize;
gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
// TODO: error check
return true;
}
static uint32_t _GBBiosCRC32(struct VFile* vf) {
ssize_t size = vf->size(vf);
if (size <= 0 || size > GB_SIZE_CART_BANK0) {
return 0;
}
void* bios = vf->map(vf, size, MAP_READ);
uint32_t biosCrc = doCrc32(bios, size);
vf->unmap(vf, bios, size);
return biosCrc;
}
void GBApplyPatch(struct GB* gb, struct Patch* patch) {
size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
if (!patchedSize) {
return;
}
if (patchedSize > GB_SIZE_CART_MAX) {
patchedSize = GB_SIZE_CART_MAX;
}
gb->memory.rom = anonymousMemoryMap(GB_SIZE_CART_MAX);
if (!patch->applyPatch(patch, gb->pristineRom, gb->pristineRomSize, gb->memory.rom, patchedSize)) {
mappedMemoryFree(gb->memory.rom, patchedSize);
gb->memory.rom = gb->pristineRom;
return;
}
gb->memory.romSize = patchedSize;
gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
}
