public NesFile(byte[] data)
{
if (data[0] != 0x4E ||
data[1] != 0x45 ||
data[2] != 0x53 ||
data[3] != 0x1A)
{
throw new Exception("Invalid NES file " + fileName);
}
if (!(data[12] == 0 && data[13] == 0 && data[14] == 0 && data[15] == 0))
{
// archaic iNES
data[7] = data[8] = data[9] = data[10] = data[11] = data[12] = data[13] = data[14] = data[15] = 0;
}
var prgSize = data[4] * 16384;
var chrSize = data[5] * 8192;
Mirroring = (MirroringType)(data[6] & 1);
Battery = (data[6] & (1 << 1)) != 0;
if ((data[6] & (1 << 2)) != 0)
{
Trainer = new byte[512];
}
else
{
Trainer = null;
}
if ((data[6] & (1 << 3)) != 0)
{
Mirroring = MirroringType.FourScreenVram;
}
Mapper = (byte)((data[6] >> 4) | (data[7] & 0xF0));
VSunisystem = (data[7] & 1) != 0;
PlayChoice10 = (data[7] & (1 << 1)) != 0;
/*
* header[8] = 0; // PRG RAM size in 8 KB
* header[9] = 0;
*/
TvSystem = (TvSystemType)(data[9] & 1);
int offset = 16;
if (Trainer != null)
{
Array.Copy(data, offset, Trainer, 0, 512);
offset += 512;
}
PRG = new byte[prgSize];
Array.Copy(data, offset, PRG, 0, Math.Max(0, Math.Min(prgSize, data.Length - offset))); // Ignore end of for some bad ROMs
offset += prgSize;
CHR = new byte[chrSize];
Array.Copy(data, offset, CHR, 0, Math.Max(0, Math.Min(chrSize, data.Length - offset)));
}
public void Reset()
{
INesMapper = 0;
CHRSize = 0;
PRGSize = 0;
Battery = false;
FrameTiming = FrameTiming.NTSC;
MirroringType = MirroringType.Vertical;
}
void SetMirroring(MirroringType mirroringType)
{
mnuMirrorHorizontal.Checked = mirroringType == MirroringType.Horizontal;
mnuMirrorVertical.Checked = mirroringType == MirroringType.Vertical;
mnuMirrorScreenA.Checked = mirroringType == MirroringType.ScreenAOnly;
mnuMirrorScreenB.Checked = mirroringType == MirroringType.ScreenBOnly;
mnuMirrorFourScreens.Checked = mirroringType == MirroringType.FourScreens;
CoreWrapper.setMirroringType(mirroringType);
}
public NameTableRam(Cartridge cartridge)
{
if ((cartridge.NesHeader.Flags6 & 0x0F) == 0x0F)
{
_mirroring = MirroringType.NONE;
}
else
{
_mirroring = (cartridge.NesHeader.Flags6 & 0x01) == 0x01 ? MirroringType.VERTICAL : MirroringType.HORIZANTAL;
}
}
public NesFixType CorrectRom()
{
int result = 0;
var crc32 = CRC32;
for (int i = 0; i < correct.Length; i += 3)
{
if (crc32 == correct[i])
{
var mapper = correct[i + 1];
var mirroring = correct[i + 2];
if (mapper >= 0)
{
// no CHR
if ((mapper & 0x800) != 0 && CHR.Length > 0)
{
CHR = new byte[0];
result |= 8;
}
// invalid mapper
if (Mapper != (mapper & 0xFF))
{
Mapper = (byte)(mapper & 0xFF);
result |= 1;
}
}
if (mirroring >= 0)
{
// Anything but hard-wired(four screen)
if (mirroring == 8 && Mirroring == MirroringType.FourScreenVram)
{
Mirroring = MirroringType.Horizontal;
result |= 2;
}
MirroringType needMirroring = MirroringType.Unknown_none;
switch (mirroring)
{
case 0:
needMirroring = MirroringType.Horizontal;
break;
case 1:
needMirroring = MirroringType.Vertical;
break;
case 2:
needMirroring = MirroringType.FourScreenVram;
break;
}
if (needMirroring != MirroringType.Unknown_none && needMirroring != Mirroring)
{
Mirroring = needMirroring;
result |= 2;
}
}
}
}
var md5 = MD5;
ulong partialmd5 = 0;
for (int x = 0; x < 8; x++)
{
partialmd5 |= (ulong)md5[15 - x] << (x * 8);
}
// maybe this games uses battery saves?
foreach (var sav in savie)
{
if (!Battery && sav == partialmd5)
{
Battery = true;
result |= 4;
}
}
return((NesFixType)result);
}
[DllImport(dllName)] public extern static void setMirroringType(MirroringType mirroring);