Function FCEUXLoad

src/fceu.cpp:1490–1539

}

bool FCEUXLoad(const char *name, FCEUFILE *fp) {
	//read ines header
	iNES_HEADER head;
	if (FCEU_fread(&head, 1, 16, fp) != 16)
		return false;

	//validate header
	if (memcmp(&head, "NES\x1a", 4))
		return 0;

	int mapper = (head.ROM_type >> 4);
	mapper |= (head.ROM_type2 & 0xF0);

	//choose what kind of cart to use.
	cart = (FCEUXCart*)new NROM();

	//fceu ines loading code uses 256 here when the romsize is 0.
	cart->prgPages = head.ROM_size;
	if (cart->prgPages == 0) {
		printf("FCEUX: received zero prgpages\n");
		cart->prgPages = 256;
	}

	cart->chrPages = head.VROM_size;

	cart->mirroring = (head.ROM_type & 1);
	if (head.ROM_type & 8) cart->mirroring = 2;

	//skip trainer
	bool hasTrainer = (head.ROM_type & 4) != 0;
	if (hasTrainer) {
		FCEU_fseek(fp, 512, SEEK_CUR);
	}

	//load data
	cart->prgSize = cart->prgPages * 16 * 1024;
	cart->chrSize = cart->chrPages * 8 * 1024;
	cart->PRG = new char[cart->prgSize];
	cart->CHR = new char[cart->chrSize];
	FCEU_fread(cart->PRG, 1, cart->prgSize, fp);
	FCEU_fread(cart->CHR, 1, cart->chrSize, fp);

	//setup the emulator
	GameInterface = FCEUXGameInterface;
	ResetCartMapping();
	SetupCartPRGMapping(0, (uint8*)cart->PRG, cart->prgSize, 0);
	SetupCartCHRMapping(0, (uint8*)cart->CHR, cart->chrSize, 0);

	return true;
}

uint8 FCEU_ReadRomByte(uint32 i) {
	extern iNES_HEADER head;