private RawTOCEntry EmitRawTOCEntry(ATOCEntry entry)
{
BCD2 tno, ino;
//this should actually be zero. im not sure if this is stored as BCD2 or not
tno = BCD2.FromDecimal(entry.TrackNo);
//these are special values.. I think, taken from this:
//http://www.staff.uni-mainz.de/tacke/scsi/SCSI2-14.html
//the CCD will contain Points as decimal values except for these specially converted decimal values which should stay as BCD.
//Why couldn't they all be BCD? I don't know. I guess because BCD is inconvenient, but only A0 and friends have special meaning. It's confusing.
ino = BCD2.FromDecimal(entry.Point);
if (entry.Point == 0xA0)
{
ino.BCDValue = 0xA0;
}
else if (entry.Point == 0xA1)
{
ino.BCDValue = 0xA1;
}
else if (entry.Point == 0xA2)
{
ino.BCDValue = 0xA2;
}
// get ADR & Control from ADR_Control byte
byte adrc = Convert.ToByte(entry.ADR_Control);
var Control = adrc & 0x0F;
var ADR = adrc >> 4;
var q = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(ADR, (EControlQ)(Control & 0xF)),
q_tno = tno,
q_index = ino,
min = BCD2.FromDecimal(entry.AMin),
sec = BCD2.FromDecimal(entry.ASec),
frame = BCD2.FromDecimal(entry.AFrame),
zero = (byte)entry.Zero,
ap_min = BCD2.FromDecimal(entry.PMin),
ap_sec = BCD2.FromDecimal(entry.PSec),
ap_frame = BCD2.FromDecimal(entry.PFrame),
q_crc = 0, //meaningless
};
return(new RawTOCEntry {
QData = q
});
}
public AFile Parse(Stream stream)
{
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
bool isDvd = false;
AFile aFile = new AFile();
aFile.MDSPath = (stream as FileStream).Name;
stream.Seek(0, SeekOrigin.Begin);
// check whether the header in the mds file is long enough
if (stream.Length < 88)
{
throw new MDSParseException("Malformed MDS format: The descriptor file does not appear to be long enough.");
}
// parse header
aFile.Header = aFile.Header.Parse(stream);
// check version to make sure this is only v1.x
// currently NO support for version 2.x
if (aFile.Header.Version[0] > 1)
{
throw new MDSParseException("MDS Parse Error: Only MDS version 1.x is supported!\nDetected version: " + aFile.Header.Version[0] + "." + aFile.Header.Version[1]);
}
// parse sessions
Dictionary <int, ASession> aSessions = new Dictionary <int, ASession>();
stream.Seek(aFile.Header.SessionOffset, SeekOrigin.Begin);
for (int se = 0; se < aFile.Header.SessionCount; se++)
{
byte[] sessionHeader = new byte[24];
stream.Read(sessionHeader, 0, 24);
//sessionHeader.Reverse().ToArray();
ASession session = new ASession();
session.SessionStart = bc.ToInt32(sessionHeader.Take(4).ToArray());
session.SessionEnd = bc.ToInt32(sessionHeader.Skip(4).Take(4).ToArray());
session.SessionNumber = bc.ToInt16(sessionHeader.Skip(8).Take(2).ToArray());
session.AllBlocks = sessionHeader[10];
session.NonTrackBlocks = sessionHeader[11];
session.FirstTrack = bc.ToInt16(sessionHeader.Skip(12).Take(2).ToArray());
session.LastTrack = bc.ToInt16(sessionHeader.Skip(14).Take(2).ToArray());
session.TrackOffset = bc.ToInt32(sessionHeader.Skip(20).Take(4).ToArray());
//mdsf.Sessions.Add(session);
aSessions.Add(session.SessionNumber, session);
}
long footerOffset = 0;
// parse track blocks
Dictionary <int, ATrack> aTracks = new Dictionary <int, ATrack>();
// iterate through each session block
foreach (ASession session in aSessions.Values)
{
stream.Seek(session.TrackOffset, SeekOrigin.Begin);
//Dictionary<int, ATrack> sessionToc = new Dictionary<int, ATrack>();
// iterate through every block specified in each session
for (int bl = 0; bl < session.AllBlocks; bl++)
{
byte[] trackHeader;
ATrack track = new ATrack();
trackHeader = new byte[80];
stream.Read(trackHeader, 0, 80);
track.Mode = trackHeader[0];
track.SubMode = trackHeader[1];
track.ADR_Control = trackHeader[2];
track.TrackNo = trackHeader[3];
track.Point = trackHeader[4];
track.AMin = trackHeader[5];
track.ASec = trackHeader[6];
track.AFrame = trackHeader[7];
track.Zero = trackHeader[8];
track.PMin = trackHeader[9];
track.PSec = trackHeader[10];
track.PFrame = trackHeader[11];
track.ExtraOffset = bc.ToInt32(trackHeader.Skip(12).Take(4).ToArray());
track.SectorSize = bc.ToInt16(trackHeader.Skip(16).Take(2).ToArray());
track.PLBA = bc.ToInt32(trackHeader.Skip(36).Take(4).ToArray());
track.StartOffset = BitConverter.ToUInt64(trackHeader.Skip(40).Take(8).ToArray(), 0);
track.Files = bc.ToInt32(trackHeader.Skip(48).Take(4).ToArray());
track.FooterOffset = bc.ToInt32(trackHeader.Skip(52).Take(4).ToArray());
if (track.Mode == 0x02)
{
isDvd = true;
throw new MDSParseException("DVD Detected. Not currently supported!");
}
// check for track extra block - this can probably be handled in a separate loop,
// but I'll just store the current stream position then seek forward to the extra block for this track
Int64 currPos = stream.Position;
// Only CDs have extra blocks - for DVDs ExtraOffset = track length
if (track.ExtraOffset > 0 && !isDvd)
{
byte[] extHeader = new byte[8];
stream.Seek(track.ExtraOffset, SeekOrigin.Begin);
stream.Read(extHeader, 0, 8);
track.ExtraBlock.Pregap = bc.ToInt32(extHeader.Take(4).ToArray());
track.ExtraBlock.Sectors = bc.ToInt32(extHeader.Skip(4).Take(4).ToArray());
stream.Seek(currPos, SeekOrigin.Begin);
}
else if (isDvd == true)
{
track.ExtraBlock.Sectors = track.ExtraOffset;
}
// read the footer/filename block for this track
currPos = stream.Position;
long numOfFilenames = track.Files;
for (long fi = 1; fi <= numOfFilenames; fi++)
{
// skip leadin/out info tracks
if (track.FooterOffset == 0)
{
continue;
}
byte[] foot = new byte[16];
stream.Seek(track.FooterOffset, SeekOrigin.Begin);
stream.Read(foot, 0, 16);
AFooter f = new AFooter();
f.FilenameOffset = bc.ToInt32(foot.Take(4).ToArray());
f.WideChar = bc.ToInt32(foot.Skip(4).Take(4).ToArray());
track.FooterBlocks.Add(f);
track.FooterBlocks = track.FooterBlocks.Distinct().ToList();
// parse the filename string
string fileName = "*.mdf";
if (f.FilenameOffset > 0)
{
// filename offset is present
stream.Seek(f.FilenameOffset, SeekOrigin.Begin);
byte[] fname;
if (numOfFilenames == 1)
{
if (aFile.Header.DPMOffset == 0)
{
// filename is in the remaining space to EOF
fname = new byte[stream.Length - stream.Position];
}
else
{
// filename is in the remaining space to EOF + dpm offset
fname = new byte[aFile.Header.DPMOffset - stream.Position];
}
}
else
{
// looks like each filename string is 6 bytes with a trailing \0
fname = new byte[6];
}
// read the filename
stream.Read(fname, 0, fname.Length);
// if widechar is 1 filename is stored using 16-bit, otherwise 8-bit is used
if (f.WideChar == 1)
{
fileName = Encoding.Unicode.GetString(fname).TrimEnd('\0');
}
else
{
fileName = Encoding.Default.GetString(fname).TrimEnd('\0');
}
}
else
{
// assume an MDF file with the same name as the MDS
}
string dir = Path.GetDirectoryName(aFile.MDSPath);
if (f.FilenameOffset == 0 ||
string.Compare(fileName, "*.mdf", StringComparison.InvariantCultureIgnoreCase) == 0)
{
fileName = dir + @"\" + Path.GetFileNameWithoutExtension(aFile.MDSPath) + ".mdf";
}
else
{
fileName = dir + @"\" + fileName;
}
track.ImageFileNamePaths.Add(fileName);
track.ImageFileNamePaths = track.ImageFileNamePaths.Distinct().ToList();
}
stream.Position = currPos;
aTracks.Add(track.Point, track);
aFile.Tracks.Add(track);
if (footerOffset == 0)
{
footerOffset = track.FooterOffset;
}
}
}
// build custom session object
aFile.ParsedSession = new List <Session>();
foreach (var s in aSessions.Values)
{
Session session = new Session();
ATrack startTrack;
ATrack endTrack;
if (!aTracks.TryGetValue(s.FirstTrack, out startTrack))
{
break;
}
if (!aTracks.TryGetValue(s.LastTrack, out endTrack))
{
break;
}
session.StartSector = startTrack.PLBA;
session.StartTrack = s.FirstTrack;
session.SessionSequence = s.SessionNumber;
session.EndSector = endTrack.PLBA + endTrack.ExtraBlock.Sectors - 1;
session.EndTrack = s.LastTrack;
aFile.ParsedSession.Add(session);
}
// now build the TOC object
foreach (var se in aFile.ParsedSession)
{
// get the first and last tracks
int sTrack = se.StartTrack;
int eTrack = se.EndTrack;
// get list of all tracks from aTracks for this session
var tracks = (from a in aTracks.Values
where a.TrackNo >= sTrack || a.TrackNo <= eTrack
orderby a.TrackNo
select a).ToList();
// create the TOC entries
foreach (var t in tracks)
{
ATOCEntry toc = new ATOCEntry(t.Point);
toc.ADR_Control = t.ADR_Control;
toc.AFrame = t.AFrame;
toc.AMin = t.AMin;
toc.ASec = t.ASec;
toc.EntryNum = t.TrackNo;
toc.PFrame = t.PFrame;
toc.PLBA = Convert.ToInt32(t.PLBA);
toc.PMin = t.PMin;
toc.Point = t.Point;
toc.PSec = t.PSec;
toc.SectorSize = t.SectorSize;
toc.Zero = t.Zero;
toc.TrackOffset = Convert.ToInt64(t.StartOffset);
toc.Session = se.SessionSequence;
toc.ImageFileNamePaths = t.ImageFileNamePaths;
toc.ExtraBlock = t.ExtraBlock;
toc.BlobIndex = t.BlobIndex;
aFile.TOCEntries.Add(toc);
}
}
return(aFile);
}
