public void LoadRom(string filepath)
{
using (var reader = new BinaryReader(new FileStream(filepath, FileMode.Open, FileAccess.Read)))
{
Info = LoadHeader(reader);
if (Info.HasTrainerData)
{
_trainerData = reader.ReadBytes(512);
}
_prgRom = reader.ReadBytes(Info.ProgramBanks * 16 * 1024);
_chrRom = reader.ReadBytes(Info.CharBanks * 8 * 1024);
}
_mapper = GetMapper(Info.MapperId);
}
private RomInfo LoadHeader(BinaryReader reader)
{
var info = new RomInfo();
var bytes = reader.ReadBytes(16);
info.ProgramBanks = bytes[4];
info.CharBanks = bytes[5];
info.Mirroring = (bytes[6] & 1) == 1 ? Mirroring.Vertical : Mirroring.Horizontal;
info.HasBattery = (bytes[6] & 2) == 2;
info.HasTrainerData = (bytes[6] & 3) == 4;
info.IgnoreMirroringControl = (bytes[6] & 4) == 8;
info.MapperId = (bytes[6] & 0xF0) >> 4;
info.Unisystem = (bytes[7] & 1) == 1;
info.PlayChoice = (bytes[7] & 2) == 2;
info.NewFormat = (bytes[7] & 6) == 6;
info.MapperId += (bytes[7] & 0xF0);
return(info);
}