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fix Jaguar CD homebrew hashing wrt retroachievements

This commit is contained in:
CasualPokePlayer 2023-04-18 22:38:13 -07:00
parent a46c47d271
commit 955139454a
1 changed files with 77 additions and 55 deletions
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132
src/BizHawk.Client.EmuHawk/RetroAchievements/RetroAchievements.GameVerification.cs
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@ -164,72 +164,62 @@ namespace BizHawk.Client.EmuHawk
// we want to hash the second session of the disc
if (disc.Sessions.Count > 2)
{
const string _jaguarHeader = "ATARI APPROVED DATA HEADER ATRI";
const string _jaguarBSHeader = "TARA IPARPVODED TA AEHDAREA RT";
var bootSession = disc.Sessions[2];
var buf2352 = new byte[2352];
// find the boot track header
// see https://github.com/TASEmulators/BizHawk/blob/f29113287e88c6a644dbff30f92a9833307aad20/waterbox/virtualjaguar/src/cdhle.cpp#L109-L145
var startLba = bootSession.FirstInformationTrack.LBA;
var numLbas = bootSession.FirstInformationTrack.NextTrack.LBA - bootSession.FirstInformationTrack.LBA;
int bootLen = 0, bootLba = 0, bootOff = 0;
bool byteswapped = false, foundHeader = false;
for (var i = 0; i < numLbas; i++)
static string HashJaguar(DiscTrack bootTrack, DiscSectorReader dsr)
{
dsr.ReadLBA_2352(startLba + i, buf2352, 0);
const string _jaguarHeader = "ATARI APPROVED DATA HEADER ATRI";
const string _jaguarBSHeader = "TARA IPARPVODED TA AEHDAREA RT";
var buffer = new List<byte>();
var buf2352 = new byte[2352];
for (var j = 0; j < 2352 - 32 - 4 - 4; j++)
// find the boot track header
// see https://github.com/TASEmulators/BizHawk/blob/f29113287e88c6a644dbff30f92a9833307aad20/waterbox/virtualjaguar/src/cdhle.cpp#L109-L145
var startLba = bootTrack.LBA;
var numLbas = bootTrack.NextTrack.LBA - bootTrack.LBA;
int bootLen = 0, bootLba = 0, bootOff = 0;
bool byteswapped = false, foundHeader = false;
for (var i = 0; i < numLbas; i++)
{
if (buf2352[j] == _jaguarHeader[0])
dsr.ReadLBA_2352(startLba + i, buf2352, 0);
for (var j = 0; j < 2352 - 32 - 4 - 4; j++)
{
if (_jaguarHeader == Encoding.ASCII.GetString(buf2352, j, 32 - 1))
if (buf2352[j] == _jaguarHeader[0])
{
bootLen = (buf2352[j + 36] << 24) | (buf2352[j + 37] << 16) | (buf2352[j + 38] << 8) | buf2352[j + 39];
bootLba = startLba + i;
bootOff = j + 32 + 4 + 4;
byteswapped = false;
foundHeader = true;
break;
if (_jaguarHeader == Encoding.ASCII.GetString(buf2352, j, 32 - 1))
{
bootLen = (buf2352[j + 36] << 24) | (buf2352[j + 37] << 16) | (buf2352[j + 38] << 8) | buf2352[j + 39];
bootLba = startLba + i;
bootOff = j + 32 + 4 + 4;
byteswapped = false;
foundHeader = true;
break;
}
}
else if (buf2352[j] == _jaguarBSHeader[0])
{
if (_jaguarBSHeader == Encoding.ASCII.GetString(buf2352, j, 32 - 2))
{
bootLen = (buf2352[j + 37] << 24) | (buf2352[j + 36] << 16) | (buf2352[j + 39] << 8) | buf2352[j + 38];
bootLba = startLba + i;
bootOff = j + 32 + 4 + 4;
byteswapped = true;
foundHeader = true;
break;
}
}
}
else if (buf2352[j] == _jaguarBSHeader[0])
if (foundHeader)
{
if (_jaguarBSHeader == Encoding.ASCII.GetString(buf2352, j, 32 - 2))
{
bootLen = (buf2352[j + 37] << 24) | (buf2352[j + 36] << 16) | (buf2352[j + 39] << 8) | buf2352[j + 38];
bootLba = startLba + i;
bootOff = j + 32 + 4 + 4;
byteswapped = true;
foundHeader = true;
break;
}
break;
}
}
if (foundHeader)
if (!foundHeader)
{
break;
return null;
}
}
if (!foundHeader)
{
return 0;
}
dsr.ReadLBA_2352(bootLba++, buf2352, 0);
if (byteswapped)
{
EndiannessUtils.MutatingByteSwap16(buf2352.AsSpan());
}
buffer.AddRange(new ArraySegment<byte>(buf2352, bootOff, Math.Min(2352 - bootOff, bootLen)));
bootLen -= 2352 - bootOff;
while (bootLen > 0)
{
dsr.ReadLBA_2352(bootLba++, buf2352, 0);
if (byteswapped)
@ -237,11 +227,43 @@ namespace BizHawk.Client.EmuHawk
EndiannessUtils.MutatingByteSwap16(buf2352.AsSpan());
}
buffer.AddRange(new ArraySegment<byte>(buf2352, 0, Math.Min(2352, bootLen)));
bootLen -= 2352;
buffer.AddRange(new ArraySegment<byte>(buf2352, bootOff, Math.Min(2352 - bootOff, bootLen)));
bootLen -= 2352 - bootOff;
while (bootLen > 0)
{
dsr.ReadLBA_2352(bootLba++, buf2352, 0);
if (byteswapped)
{
EndiannessUtils.MutatingByteSwap16(buf2352.AsSpan());
}
buffer.AddRange(new ArraySegment<byte>(buf2352, 0, Math.Min(2352, bootLen)));
bootLen -= 2352;
}
return MD5Checksum.ComputeDigestHex(buffer.ToArray());
}
break;
var jaguarHash = HashJaguar(disc.Sessions[2].Tracks[1], dsr);
switch (jaguarHash)
{
case null:
return 0;
case "254487B59AB21BC005338E85CBF9FD2F": // see https://github.com/RetroAchievements/rcheevos/pull/234
{
jaguarHash = HashJaguar(disc.Sessions[2].Tracks[2], dsr);
if (jaguarHash is null)
{
return 0;
}
break;
}
}
return IdentifyHash(jaguarHash);
}
return 0;