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Implement detection of Neo Geo CD discs.

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This commit is contained in:
Natalia Portillo
2020-06-21 17:15:02 +01:00
parent 43360c340e
commit 97f8a860a4
1 changed files with 152 additions and 3 deletions
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155
Aaru.Core/Media/Detection/MMC.cs
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@@ -34,6 +34,7 @@ using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.Checksums;
using Aaru.CommonTypes;
using Aaru.Console;
@@ -1105,8 +1106,10 @@ namespace Aaru.Core.Media.Detection
if(isoSector.Length < 2048)
break;
List<string> rootEntries = new List<string>();
int rootPos = 0;
List<string> rootEntries = new List<string>();
int rootPos = 0;
uint ngcdIplStart = 0;
uint ngcdIplLength = 0;
while(isoSector[rootPos] > 0 &&
rootPos < isoSector.Length &&
@@ -1121,9 +1124,14 @@ namespace Aaru.Core.Media.Detection
name = name.Substring(0, name.Length - 2);
// TODO: Video CD and Super Video CD
// TODO: Neo-Geo CD requires reading the filesystem and checking that the file "/IPL.TXT" is correct
rootEntries.Add(name);
if(name == "IPL.TXT")
{
ngcdIplStart = BitConverter.ToUInt32(isoSector, rootPos + 2);
ngcdIplLength = BitConverter.ToUInt32(isoSector, rootPos + 10);
}
rootPos += isoSector[rootPos];
}
@@ -1138,8 +1146,149 @@ namespace Aaru.Core.Media.Detection
}
if(rootEntries.Contains("CDTV.TM"))
{
mediaType = MediaType.CDTV;
return;
}
// "IPL.TXT" length
if(ngcdIplLength > 0)
{
uint ngcdSectors = ngcdIplLength / 2048;
if(ngcdIplLength % 2048 > 0)
ngcdSectors++;
string iplTxt = null;
// Read "IPL.TXT"
try
{
using var ngcdMs = new MemoryStream();
for(uint i = 0; i < ngcdSectors; i++)
{
sense = dev.Read12(out isoSector, out _, 0, false, true, false, false, ngcdIplStart + i,
2048, 0, 1, false, dev.Timeout, out _);
if(sense)
break;
ngcdMs.Write(isoSector, 0, 2048);
}
isoSector = ngcdMs.ToArray();
iplTxt = Encoding.ASCII.GetString(isoSector);
}
catch
{
iplTxt = null;
}
// Check "IPL.TXT" lines
if(iplTxt != null)
{
using var sr = new StringReader(iplTxt);
bool correctNeoGeoCd = true;
int lineNumber = 0;
while(sr.Peek() > 0)
{
string? line = sr.ReadLine();
// End of file
if(line is null ||
line.Length == 0)
{
if(lineNumber == 0)
correctNeoGeoCd = false;
break;
}
// Split line by comma
string[] split = line.Split(',');
// Empty line
if(split.Length == 0)
continue;
// More than 3 entries
if(split.Length != 3)
{
correctNeoGeoCd = false;
break;
}
// Split filename
string[] split2 = split[0].Split('.');
// Filename must have two parts, name and extension
if(split2.Length != 2)
{
correctNeoGeoCd = false;
break;
}
// Name must be smaller or equal to 8 characters
if(split2[0].Length > 8)
{
correctNeoGeoCd = false;
break;
}
// Extension must be smaller or equal to 8 characters
if(split2[1].Length > 3)
{
correctNeoGeoCd = false;
break;
}
// Second part must be a single digit
if(split[1].Length != 1 ||
!byte.TryParse(split[1], out _))
{
correctNeoGeoCd = false;
break;
}
// Third part must be bigger or equal to 1 and smaller or equal to 8
if(split[2].Length < 1 ||
split[2].Length > 8)
{
correctNeoGeoCd = false;
break;
}
try
{
_ = Convert.ToUInt32(split[2], 16);
}
catch
{
correctNeoGeoCd = false;
break;
}
lineNumber++;
}
if(correctNeoGeoCd)
{
mediaType = MediaType.NeoGeoCD;
}
}
}
break;
}