// verify the data in the provided ROM bytes matches the data we expect it to have.
// returns error message if it's not identical, or null if everything is OK.
public static string IsThisRomIsIdenticalToUs(byte[] rom,
RomMapMode mode, string requiredGameNameMatch, int requiredRomChecksumMatch)
{
var romSettingsOffset = GetRomSettingOffset(mode);
if (rom.Length <= romSettingsOffset + 10)
{
return("The linked ROM is too small. It can't be opened.");
}
var internalGameNameToVerify = GetRomTitleName(rom, romSettingsOffset);
var checksumToVerify = ByteUtil.ByteArrayToInt32(rom, romSettingsOffset + 7);
if (internalGameNameToVerify != requiredGameNameMatch)
{
return($"The linked ROM's internal name '{internalGameNameToVerify}' doesn't " +
$"match the project's internal name of '{requiredGameNameMatch}'.");
}
if (checksumToVerify != requiredRomChecksumMatch)
{
return($"The linked ROM's checksums '{checksumToVerify:X8}' " +
$"don't match the project's checksums of '{requiredRomChecksumMatch:X8}'.");
}
return(null);
}
public BsnesTraceLogImporter(Data data)
{
this.data = data;
romSizeCached = data.GetRomSize();
romMapModeCached = data.RomMapMode;
InitStats();
InitObjectPool();
}
public BsnesTraceLogImporter(Data data)
{
this.data = data;
romSizeCached = data?.GetRomSize() ?? 0;
romMapModeCached = data?.RomMapMode ?? default;
InitStats();
InitObjectPool();
}
public void TestRomDetectionFastRom()
{
var analyzer = new SnesRomAnalyzer();
analyzer.Analyze(CartNameData.ExampleHiRomFile);
analyzer.Filename.Should().Be(CartNameData.ExampleHiRomFile);
analyzer.AnalysisResults!.RomMapMode.Should().Be(RomMapMode.HiRom);
analyzer.AnalysisResults.RomSpeed.Should().Be(RomSpeed.FastRom);
analyzer.RomBytes.Should().HaveCount(0x400000);
analyzer.RomSettingsOffset.Should().Be(RomUtil.HiromSettingOffset);
}
public static Data InitializeEmptyRomMapping(this Data data, int size, RomMapMode mode, RomSpeed speed)
{
var romByteSource = new ByteSource
{
Bytes = new StorageList <ByteEntry>(size),
Name = "Snes ROM"
};
PopulateFromRom(data, romByteSource, mode, speed);
return(data);
}
internal static bool goodchecksum(IList <byte> romdata, RomMapMode mode, int size)
{
int snestopc(int snesAddress) => RomUtil.ConvertSnesToPc(snesAddress, mode, size);
var checksum = (int)getchecksum(romdata);
return(((romdata[snestopc(0x00FFDE)] ^ romdata[snestopc(0x00FFDC)]) == 0xFF) &&
((romdata[snestopc(0x00FFDF)] ^ romdata[snestopc(0x00FFDD)]) == 0xFF) &&
((romdata[snestopc(0x00FFDE)] & 0xFF) == (checksum & 0xFF)) &&
((romdata[snestopc(0x00FFDF)] & 0xFF) == ((checksum >> 8) & 0xFF)));
}
internal static void fixchecksum(IList <byte> romdata, RomMapMode mode, int size)
{
int snestopc(int snesAddress) => RomUtil.ConvertSnesToPc(snesAddress, mode, size);
// randomdude999: clear out checksum bytes before recalculating checksum, this should make it correct on roms that don't have a checksum yet
romdata.writeromdata(snestopc(0x00FFDC), 0xFFFF0000);
var checksum = getchecksum(romdata);
romdata.writeromdata_byte(snestopc(0x00FFDE), (byte)(checksum & 255));
romdata.writeromdata_byte(snestopc(0x00FFDF), (byte)((checksum >> 8) & 255));
romdata.writeromdata_byte(snestopc(0x00FFDC), (byte)((checksum & 255) ^ 255));
romdata.writeromdata_byte(snestopc(0x00FFDD), (byte)(((checksum >> 8) & 255) ^ 255));
}
public static int ConvertPCtoSnes(int offset, RomMapMode romMapMode, RomSpeed romSpeed)
{
switch (romMapMode)
{
case RomMapMode.LoRom:
offset = ((offset & 0x3F8000) << 1) | 0x8000 | (offset & 0x7FFF);
if (romSpeed == RomSpeed.FastRom || offset >= 0x7E0000)
{
offset |= 0x800000;
}
return(offset);
case RomMapMode.HiRom:
offset |= 0x400000;
if (romSpeed == RomSpeed.FastRom || offset >= 0x7E0000)
{
offset |= 0x800000;
}
return(offset);
case RomMapMode.ExHiRom when offset < 0x40000:
offset |= 0xC00000;
return(offset);
case RomMapMode.ExHiRom:
if (offset >= 0x7E0000)
{
offset &= 0x3FFFFF;
}
return(offset);
case RomMapMode.ExSa1Rom when offset >= 0x400000:
offset += 0x800000;
return(offset);
}
offset = ((offset & 0x3F8000) << 1) | 0x8000 | (offset & 0x7FFF);
if (offset >= 0x400000)
{
offset += 0x400000;
}
return(offset);
}
public static int ConvertSnesToPc(int address, RomMapMode mode, int size)
{
if (address < 0)
{
return(-1);
}
int UnmirroredOffset(int offset) => RomUtil.UnmirroredOffset(offset, size);
// WRAM is N/A to PC addressing
if ((address & 0xFE0000) == 0x7E0000)
{
return(-1);
}
// WRAM mirror & PPU regs are N/A to PC addressing
if (((address & 0x400000) == 0) && ((address & 0x8000) == 0))
{
return(-1);
}
switch (mode)
{
case RomMapMode.LoRom:
{
// SRAM is N/A to PC addressing
if (((address & 0x700000) == 0x700000) && ((address & 0x8000) == 0))
{
return(-1);
}
return(UnmirroredOffset(((address & 0x7F0000) >> 1) | (address & 0x7FFF)));
}
case RomMapMode.HiRom:
{
return(UnmirroredOffset(address & 0x3FFFFF));
}
case RomMapMode.SuperMmc:
{
return(UnmirroredOffset(address & 0x3FFFFF)); // todo, treated as hirom atm
}
case RomMapMode.Sa1Rom:
case RomMapMode.ExSa1Rom:
{
// BW-RAM is N/A to PC addressing
if (address >= 0x400000 && address <= 0x7FFFFF)
{
return(-1);
}
if (address >= 0xC00000)
{
return(mode == RomMapMode.ExSa1Rom ? UnmirroredOffset(address & 0x7FFFFF) : UnmirroredOffset(address & 0x3FFFFF));
}
if (address >= 0x800000)
{
address -= 0x400000;
}
// SRAM is N/A to PC addressing
if (((address & 0x8000) == 0))
{
return(-1);
}
return(UnmirroredOffset(((address & 0x7F0000) >> 1) | (address & 0x7FFF)));
}
case RomMapMode.SuperFx:
{
// BW-RAM is N/A to PC addressing
if (address >= 0x600000 && address <= 0x7FFFFF)
{
return(-1);
}
if (address < 0x400000)
{
return(UnmirroredOffset(((address & 0x7F0000) >> 1) | (address & 0x7FFF)));
}
if (address < 0x600000)
{
return(UnmirroredOffset(address & 0x3FFFFF));
}
if (address < 0xC00000)
{
return(0x200000 + UnmirroredOffset(((address & 0x7F0000) >> 1) | (address & 0x7FFF)));
}
return(0x400000 + UnmirroredOffset(address & 0x3FFFFF));
}
case RomMapMode.ExHiRom:
{
return(UnmirroredOffset(((~address & 0x800000) >> 1) | (address & 0x3FFFFF)));
}
case RomMapMode.ExLoRom:
{
// SRAM is N/A to PC addressing
if (((address & 0x700000) == 0x700000) && ((address & 0x8000) == 0))
{
return(-1);
}
return(UnmirroredOffset((((address ^ 0x800000) & 0xFF0000) >> 1) | (address & 0x7FFF)));
}
default:
{
return(-1);
}
}
}
public static int GetBankSize(RomMapMode mode)
{
// todo
return(mode == RomMapMode.LoRom ? 0x8000 : 0x10000);
}
public static int ConvertSnesToPc(int address, RomMapMode mode, int size)
{
var index = ConvertSnesToPcRaw(address, mode, size);
return(index < 0 ? -1 : index);
}
public static RomSpeed GetRomSpeed(RomMapMode mode, IReadOnlyList <byte> romBytes) => GetRomSpeed(GetRomSettingOffset(mode), romBytes);
public static Data PopulateFrom(this Data data, IReadOnlyCollection <byte> actualRomBytes, RomMapMode romMapMode, RomSpeed romSpeed)
{
var mapping = RomUtil.CreateRomMappingFromRomRawBytes(actualRomBytes, romMapMode, romSpeed);
return(PopulateFrom(data, mapping));
}
public static Data PopulateFromRom(this Data data, ByteSource romByteSource, RomMapMode romMapMode, RomSpeed romSpeed)
{
var mapping = RomUtil.CreateRomMappingFromRomByteSource(romByteSource, romMapMode, romSpeed);
return(PopulateFrom(data, mapping));
}
public static void UpdateRomChecksum(IList <byte> romdata, RomMapMode mode, int size) => AsarChecksumUtil.fixchecksum(romdata, mode, size);
public static bool IsRomChecksumValid(IList <byte> romdata, RomMapMode mode, int size) => AsarChecksumUtil.goodchecksum(romdata, mode, size);
