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)
{
foreach (var t in aTracks.Values
.Where(a => se.StartTrack <= a.TrackNo && a.TrackNo <= se.EndTrack)
.OrderBy(a => a.TrackNo))
{
aFile.TOCEntries.Add(new ATOCEntry(t.Point)
{
ADR_Control = t.ADR_Control,
AFrame = t.AFrame,
AMin = t.AMin,
ASec = t.ASec,
BlobIndex = t.BlobIndex,
EntryNum = t.TrackNo,
ExtraBlock = t.ExtraBlock,
ImageFileNamePaths = t.ImageFileNamePaths,
PFrame = t.PFrame,
PLBA = Convert.ToInt32(t.PLBA),
PMin = t.PMin,
Point = t.Point,
PSec = t.PSec,
SectorSize = t.SectorSize,
Session = se.SessionSequence,
TrackOffset = Convert.ToInt64(t.StartOffset),
Zero = t.Zero
});
}
}
return(aFile);
}
/// <summary>
/// Parse the node record from the given ISO9660 stream.
/// </summary>
/// <param name="s">The stream to parse from.</param>
public void ParseISO9660(Stream s)
{
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Get the length
s.Read(buffer, 0, 1);
this.Length = buffer[0];
//the number of sectors in the attribute record
s.Read(buffer, 0, 1);
// Read Data Offset
s.Read(buffer, 0, 8);
this.OffsetOfData = (long)bc.ToInt32(buffer);
// Read Data Length
s.Read(buffer, 0, 8);
this.LengthOfData = (long)bc.ToInt32(buffer);
// Read the time and flags
s.Read(buffer, 0, 8);
this.Year = buffer[0];
this.Month = buffer[1];
this.Day = buffer[2];
this.Hour = buffer[3];
this.Minute = buffer[4];
this.Second = buffer[5];
this.TimeZoneOffset = buffer[6];
this.Flags = buffer[7];
s.Read(buffer, 0, 6);
// Read the name length
s.Read(buffer, 0, 1);
this.NameLength = buffer[0];
// Read the directory name
s.Read(buffer, 0, this.NameLength);
if (this.NameLength == 1 && (buffer[0] == 0 || buffer[0] == 1))
{
if (buffer[0] == 0)
{
this.Name = ISONodeRecord.CURRENT_DIRECTORY;
}
else
{
this.Name = ISONodeRecord.PARENT_DIRECTORY;
}
}
else
{
this.Name = ASCIIEncoding.ASCII.GetString(buffer, 0, this.NameLength);
}
// Seek to end
s.Seek(startPosition + this.Length, SeekOrigin.Begin);
}
/// <summary>
/// Parse the node record from the given CD-I stream.
/// </summary>
/// <param name="s">The stream to parse from.</param>
public void ParseCDInteractive(Stream s)
{
/*
* BP Size in bytes Description
* 1 1 Record length
* 2 1 Extended Attribute record length
* 3 4 Reserved
* 7 4 File beginning LBN
* 11 4 Reserved
* 15 4 File size
* 19 6 Creation date
* 25 1 Reserved
* 26 1 File flags
* 27 2 Interleave
* 29 2 Reserved
* 31 2 Album Set Sequence number
* 33 1 File name size
* 34 (n) File name
* 34+n 4 Owner ID
* 38+n 2 Attributes
* 40+n 2 Reserved
* 42+n 1 File number
* 43+n 1 Reserved
* 43+n Total
*/
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
s.Position -= ISOFile.SECTOR_SIZE;
// Get the record length
this.Length = buffer[0];
// extended attribute record length
this.ExtendedAttribRecordLength = buffer[1];
// Read Data Offset
this.OffsetOfData = bcBig.ReadIntValue(buffer, 6, 4);
// Read Data Length
this.LengthOfData = bcBig.ReadIntValue(buffer, 14, 4);
// Read the time
var ti = bc.ReadBytes(buffer, 18, 6);
this.Year = ti[0];
this.Month = ti[1];
this.Day = ti[2];
this.Hour = ti[3];
this.Minute = ti[4];
this.Second = ti[5];
// read interleave - still to do
// read album (volume) set sequence number (we are ignoring this)
// Read the name length
this.NameLength = buffer[32];
// Read the file/directory name
var name = bc.ReadBytes(buffer, 33, this.NameLength);
if (this.NameLength == 1 && (name[0] == 0 || name[0] == 1))
{
if (name[0] == 0)
{
this.Name = ISONodeRecord.CURRENT_DIRECTORY;
}
else
{
this.Name = ISONodeRecord.PARENT_DIRECTORY;
}
}
else
{
this.Name = ASCIIEncoding.ASCII.GetString(name, 0, this.NameLength);
}
// skip ownerID for now
// read the flags - only really interested in the directory attribute (bit 15)
// (confusingly these are called 'attributes' in CD-I. the CD-I 'File Flags' entry is something else entirely)
this.Flags = buffer[37 + this.NameLength];
// skip filenumber
//this.FileNumber = buffer[41 + this.NameLength];
// Seek to end
s.Seek(startPosition + this.Length, SeekOrigin.Begin);
}