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add "TurboGECD" disc type identifier. fixes #2043

This commit is contained in:
zeromus 2020-05-26 13:12:47 -05:00
parent 78bde0a5b4
commit 2c62d8cf73
1 changed files with 45 additions and 8 deletions
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53
src/BizHawk.Emulation.DiscSystem/DiscIdentifier.cs
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@ -44,6 +44,11 @@ namespace BizHawk.Emulation.DiscSystem
/// </summary>
TurboCD,
/// <summary>
/// PC Engine "GECD" for unlicensed games
/// </summary>
TurboGECD,
/// <summary>
/// MegaDrive add-on
/// </summary>
@ -123,8 +128,11 @@ namespace BizHawk.Emulation.DiscSystem
if (DetectPCFX())
return DiscType.PCFX;
if (DetectTurboGECD())
return DiscType.TurboGECD;
if (DetectTurboCD())
return DiscType.TurboCD;
return DiscType.TurboCD;
//check track 1's data type. if it's an audio track, further data-track testing is useless
//furthermore, it's probably senseless (no binary data there to read)
@ -260,6 +268,35 @@ namespace BizHawk.Emulation.DiscSystem
return false;
}
private bool DetectTurboGECD()
{
//approach taken from mednafen DetectGECD()
//check for appropriate structure
var toc = _disc.TOC;
if (toc.FirstRecordedTrackNumber != 1) return false;
if (!toc.TOCItems[1].IsData) return false;
//some have a signature
if (StringAt("HACKER CD ROM SYSTEM", 0x8, 0x10))
return true;
//some are more confusing
if (!StringAt("CD001", 0x1, 0x10))
return false;
byte[] sector20 = ReadDataSectorCached(20);
uint zecrc = (uint)BizHawk.Common.CRC32.Calculate(sector20);
//known_crcs
if (zecrc == 0xd7b47c06) return true; // AV Tanjou
if (zecrc == 0x86aec522) return true; // Bishoujo Jyanshi [...]
if (zecrc == 0xc8d1b5ef) return true; // CD Bishoujo [...]
if (zecrc == 0x0bdbde64) return true; // CD Pachisuro [...]
return false;
}
//asni 20171011 - this ONLY works if a valid cuefile/ccd is passed into DiscIdentifier.
//if an .iso is presented, the internally manufactured cue data does not work - possibly something to do with
//track 01 being Audio. Not tested, but presumably PCFX has the same issue
@ -311,7 +348,7 @@ namespace BizHawk.Emulation.DiscSystem
private bool DetectGameCube()
{
var data = ReadSectorCached(0);
var data = ReadDataSectorCached(0);
if (data == null) return false;
byte[] magic = data.Skip(28).Take(4).ToArray();
string hexString = "";
@ -323,7 +360,7 @@ namespace BizHawk.Emulation.DiscSystem
private bool DetectWii()
{
var data = ReadSectorCached(0);
var data = ReadDataSectorCached(0);
if (data == null) return false;
byte[] magic = data.Skip(24).Take(4).ToArray();
string hexString = "";
@ -333,7 +370,7 @@ namespace BizHawk.Emulation.DiscSystem
return hexString == "5D1C9EA3";
}
private byte[] ReadSectorCached(int lba)
private byte[] ReadDataSectorCached(int lba)
{
//read it if we don't have it cached
//we wont be caching very much here, it's no big deal
@ -349,19 +386,19 @@ namespace BizHawk.Emulation.DiscSystem
return data;
}
private bool StringAt(string s, int n, int lba = 0)
private bool StringAt(string s, int offset, int lba = 0)
{
var data = ReadSectorCached(lba);
var data = ReadDataSectorCached(lba);
if (data == null) return false;
byte[] cmp = Encoding.ASCII.GetBytes(s);
byte[] cmp2 = new byte[cmp.Length];
Buffer.BlockCopy(data, n, cmp2, 0, cmp.Length);
Buffer.BlockCopy(data, offset, cmp2, 0, cmp.Length);
return cmp.SequenceEqual(cmp2);
}
private bool SectorContains(string s, int lba = 0)
{
var data = ReadSectorCached(lba);
var data = ReadDataSectorCached(lba);
return data != null && Encoding.ASCII.GetString(data).ToLower().Contains(s.ToLower());
}
}