public Cartridge(string filename)
{
Raw = System.IO.File.ReadAllBytes(filename);
int header = BitConverter.ToInt32(Raw, 0);
if (header != 0x1A53454E) // "NES<EOF>"
{
throw new FormatException("unexpected header value " + header.ToString("X"));
}
PRGROMSize = Raw[4] * 0x4000; // 16kb units
CHRROMSize = Raw[5] * 0x2000; // 8kb units
PRGRAMSize = Raw[8] * 0x2000;
bool hasTrainer = (Raw[6] & 0b100) > 0;
PRGROMOffset = 16 + (hasTrainer ? 512 : 0);
MirroringMode = (Raw[6] & 0x1) > 0 ? VRAMMirroringMode.Vertical : VRAMMirroringMode.Horizontal;
if ((Raw[6] & 0x8) > 0)
{
MirroringMode = VRAMMirroringMode.All;
}
MapperNumber = (Raw[6] >> 4) | (Raw[7] & 0xF0);
PRGROM = new byte[PRGROMSize];
Array.Copy(Raw, PRGROMOffset, PRGROM, 0, PRGROMSize);
if (CHRROMSize == 0)
{
CHRROM = new byte[0x2000];
}
else
{
CHRROM = new byte[CHRROMSize];
Array.Copy(Raw, PRGROMOffset + PRGROMSize, CHRROM, 0, CHRROMSize);
}
}
protected Mapper(Emulator emu, VRAMMirroringMode vramMirroring)
: base(emu)
{
this.VRAMMirroring = vramMirroring;
}
