/// <exception cref="MDSParseException">path reference no longer points to file</exception>
private Dictionary <int, IBlob> MountBlobs(AFile mdsf, Disc disc)
{
Dictionary <int, IBlob> BlobIndex = new Dictionary <int, IBlob>();
int count = 0;
foreach (var track in mdsf.Tracks)
{
foreach (var file in track.ImageFileNamePaths.Distinct())
{
if (!File.Exists(file))
{
throw new MDSParseException($"Malformed MDS format: nonexistent image file: {file}");
}
IBlob mdfBlob = null;
long mdfLen = -1;
//mount the file
if (mdfBlob == null)
{
var mdfFile = new Blob_RawFile()
{
PhysicalPath = file
};
mdfLen = mdfFile.Length;
mdfBlob = mdfFile;
}
bool dupe = false;
foreach (var re in disc.DisposableResources)
{
if (re.ToString() == mdfBlob.ToString())
{
dupe = true;
}
}
if (!dupe)
{
// wrap in zeropadadapter
disc.DisposableResources.Add(mdfBlob);
BlobIndex[count++] = mdfBlob;
}
}
}
return(BlobIndex);
}
/// <exception cref="MDSParseException">no file found at <paramref name="mdsPath"/> or BLOB error</exception>
public Disc LoadMDSToDisc(string mdsPath, DiscMountPolicy IN_DiscMountPolicy)
{
var loadResults = LoadMDSPath(mdsPath);
if (!loadResults.Valid)
{
throw loadResults.FailureException;
}
Disc disc = new Disc();
// load all blobs
Dictionary <int, IBlob> BlobIndex = MountBlobs(loadResults.ParsedMDSFile, disc);
var mdsf = loadResults.ParsedMDSFile;
//generate DiscTOCRaw items from the ones specified in the MDS file
disc.RawTOCEntries = new List <RawTOCEntry>();
foreach (var entry in mdsf.TOCEntries)
{
disc.RawTOCEntries.Add(EmitRawTOCEntry(entry));
}
//analyze the RAWTocEntries to figure out what type of track track 1 is
var tocSynth = new Synthesize_DiscTOC_From_RawTOCEntries_Job(disc.RawTOCEntries);
tocSynth.Run();
// now build the sectors
int currBlobIndex = 0;
foreach (var session in mdsf.ParsedSession)
{
for (int i = session.StartTrack; i <= session.EndTrack; i++)
{
int relMSF = -1;
var track = mdsf.TOCEntries.FirstOrDefault(t => t.Point == i);
if (track == null)
{
break;
}
// ignore the info entries
if (track.Point == 0xA0 ||
track.Point == 0xA1 ||
track.Point == 0xA2)
{
continue;
}
// get the blob(s) for this track
// it's probably a safe assumption that there will be only one blob per track, but I'm still not 100% sure on this
var tr = mdsf.TOCEntries.FirstOrDefault(a => a.Point == i) ?? throw new MDSParseException("BLOB Error!");
#if true
if (tr.ImageFileNamePaths.Count == 0)
{
throw new MDSParseException("BLOB Error!");
}
#else // this is the worst use of lists and LINQ I've seen in this god-forsaken codebase, I hope for all our sakes that it's not a workaround for some race condition --yoshi
List <string> blobstrings = new List <string>();
foreach (var t in tr.ImageFileNamePaths)
{
if (!blobstrings.Contains(t))
{
blobstrings.Add(t);
}
}
var tBlobs = (from a in tr.ImageFileNamePaths
select a).ToList();
if (tBlobs.Count < 1)
{
throw new MDSParseException("BLOB Error!");
}
// is the currBlob valid for this track, or do we need to increment?
string bString = tBlobs.First();
#endif
IBlob mdfBlob = null;
// check for track pregap and create if necessary
// this is specified in the track extras block
if (track.ExtraBlock.Pregap > 0)
{
CUE.CueTrackType pregapTrackType = CUE.CueTrackType.Audio;
if (tocSynth.Result.TOCItems[1].IsData)
{
if (tocSynth.Result.Session1Format == SessionFormat.Type20_CDXA)
{
pregapTrackType = CUE.CueTrackType.Mode2_2352;
}
else if (tocSynth.Result.Session1Format == SessionFormat.Type10_CDI)
{
pregapTrackType = CUE.CueTrackType.CDI_2352;
}
else if (tocSynth.Result.Session1Format == SessionFormat.Type00_CDROM_CDDA)
{
pregapTrackType = CUE.CueTrackType.Mode1_2352;
}
}
for (int pre = 0; pre < track.ExtraBlock.Pregap; pre++)
{
relMSF++;
var ss_gap = new CUE.SS_Gap()
{
Policy = IN_DiscMountPolicy,
TrackType = pregapTrackType
};
disc._Sectors.Add(ss_gap);
int qRelMSF = pre - Convert.ToInt32(track.ExtraBlock.Pregap);
//tweak relMSF due to ambiguity/contradiction in yellowbook docs
if (!IN_DiscMountPolicy.CUE_PregapContradictionModeA)
{
qRelMSF++;
}
//setup subQ
byte ADR = 1; //absent some kind of policy for how to set it, this is a safe assumption:
ss_gap.sq.SetStatus(ADR, tocSynth.Result.TOCItems[1].Control);
ss_gap.sq.q_tno = BCD2.FromDecimal(1);
ss_gap.sq.q_index = BCD2.FromDecimal(0);
ss_gap.sq.AP_Timestamp = pre;
ss_gap.sq.Timestamp = qRelMSF;
//setup subP
ss_gap.Pause = true;
}
// pregap processing completed
}
// create track sectors
long currBlobOffset = track.TrackOffset;
for (long sector = session.StartSector; sector <= session.EndSector; sector++)
{
CUE.SS_Base sBase = null;
// get the current blob from the BlobIndex
Blob_RawFile currBlob = (Blob_RawFile)BlobIndex[currBlobIndex];
long currBlobLength = currBlob.Length;
long currBlobPosition = sector;
if (currBlobPosition == currBlobLength)
{
currBlobIndex++;
}
mdfBlob = disc.DisposableResources[currBlobIndex] as Blob_RawFile;
//int userSector = 2048;
switch (track.SectorSize)
{
case 2448:
sBase = new CUE.SS_2352()
{
Policy = IN_DiscMountPolicy
};
//userSector = 2352;
break;
case 2048:
default:
sBase = new CUE.SS_Mode1_2048()
{
Policy = IN_DiscMountPolicy
};
//userSector = 2048;
break;
//throw new Exception($"Not supported: Sector Size {track.SectorSize}");
}
// configure blob
sBase.Blob = mdfBlob;
sBase.BlobOffset = currBlobOffset;
currBlobOffset += track.SectorSize; // userSector;
// add subchannel data
relMSF++;
BCD2 tno, ino;
//this should actually be zero. im not sure if this is stored as BCD2 or not
tno = BCD2.FromDecimal(track.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(track.Point);
if (track.Point == 0xA0)
{
ino.BCDValue = 0xA0;
}
else if (track.Point == 0xA1)
{
ino.BCDValue = 0xA1;
}
else if (track.Point == 0xA2)
{
ino.BCDValue = 0xA2;
}
// get ADR & Control from ADR_Control byte
byte adrc = Convert.ToByte(track.ADR_Control);
var Control = adrc & 0x0F;
var ADR = adrc >> 4;
var q = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(ADR, (EControlQ)(Control & 0xF)),
q_tno = BCD2.FromDecimal(track.Point),
q_index = ino,
AP_Timestamp = disc._Sectors.Count,
Timestamp = relMSF - Convert.ToInt32(track.ExtraBlock.Pregap)
};
sBase.sq = q;
disc._Sectors.Add(sBase);
}
}
}
return(disc);
}
/// <exception cref="CCDParseException">file <paramref name="ccdPath"/> not found, nonexistent IMG file, nonexistent SUB file, IMG or SUB file not multiple of <c>2352 B</c>, or IMG and SUB files differ in length</exception>
public Disc LoadCCDToDisc(string ccdPath, DiscMountPolicy IN_DiscMountPolicy)
{
var loadResults = LoadCCDPath(ccdPath);
if (!loadResults.Valid)
{
throw loadResults.FailureException;
}
Disc disc = new Disc();
IBlob imgBlob = null, subBlob = null;
long imgLen = -1, subLen;
//mount the IMG file
//first check for a .ecm in place of the img
var imgPath = loadResults.ImgPath;
if (!File.Exists(imgPath))
{
var ecmPath = Path.ChangeExtension(imgPath, ".img.ecm");
if (File.Exists(ecmPath))
{
if (Blob_ECM.IsECM(ecmPath))
{
var ecm = new Blob_ECM();
ecm.Load(ecmPath);
imgBlob = ecm;
imgLen = ecm.Length;
}
}
}
if (imgBlob == null)
{
if (!File.Exists(loadResults.ImgPath))
{
throw new CCDParseException("Malformed CCD format: nonexistent IMG file!");
}
var imgFile = new Blob_RawFile()
{
PhysicalPath = loadResults.ImgPath
};
imgLen = imgFile.Length;
imgBlob = imgFile;
}
disc.DisposableResources.Add(imgBlob);
//mount the SUB file
if (!File.Exists(loadResults.SubPath))
{
throw new CCDParseException("Malformed CCD format: nonexistent SUB file!");
}
var subFile = new Blob_RawFile()
{
PhysicalPath = loadResults.SubPath
};
subBlob = subFile;
disc.DisposableResources.Add(subBlob);
subLen = subFile.Length;
//quick integrity check of file sizes
if (imgLen % 2352 != 0)
{
throw new CCDParseException("Malformed CCD format: IMG file length not multiple of 2352");
}
int NumImgSectors = (int)(imgLen / 2352);
if (subLen != NumImgSectors * 96)
{
throw new CCDParseException("Malformed CCD format: SUB file length not matching IMG");
}
var ccdf = loadResults.ParsedCCDFile;
//the only instance of a sector synthesizer we'll need
SS_CCD synth = new SS_CCD();
//generate DiscTOCRaw items from the ones specified in the CCD file
//TODO - range validate these (too many truncations to byte)
disc.RawTOCEntries = new List <RawTOCEntry>();
foreach (var entry in ccdf.TOCEntries)
{
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;
}
var q = new SubchannelQ
{
q_status = SubchannelQ.ComputeStatus(entry.ADR, (EControlQ)(entry.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
};
disc.RawTOCEntries.Add(new RawTOCEntry {
QData = q
});
}
//analyze the RAWTocEntries to figure out what type of track track 1 is
var tocSynth = new Synthesize_DiscTOC_From_RawTOCEntries_Job(disc.RawTOCEntries);
tocSynth.Run();
//Add sectors for the mandatory track 1 pregap, which isn't stored in the CCD file
//We reuse some CUE code for this.
//If we load other formats later we might should abstract this even further (to a synthesizer job)
//It can't really be abstracted from cue files though due to the necessity of merging this with other track 1 pregaps
CUE.CueTrackType pregapTrackType = CUE.CueTrackType.Audio;
if (tocSynth.Result.TOCItems[1].IsData)
{
if (tocSynth.Result.Session1Format == SessionFormat.Type20_CDXA)
{
pregapTrackType = CUE.CueTrackType.Mode2_2352;
}
else if (tocSynth.Result.Session1Format == SessionFormat.Type10_CDI)
{
pregapTrackType = CUE.CueTrackType.CDI_2352;
}
else if (tocSynth.Result.Session1Format == SessionFormat.Type00_CDROM_CDDA)
{
pregapTrackType = CUE.CueTrackType.Mode1_2352;
}
}
for (int i = 0; i < 150; i++)
{
var ss_gap = new CUE.SS_Gap()
{
Policy = IN_DiscMountPolicy,
TrackType = pregapTrackType
};
disc._Sectors.Add(ss_gap);
int qRelMSF = i - 150;
//tweak relMSF due to ambiguity/contradiction in yellowbook docs
if (!IN_DiscMountPolicy.CUE_PregapContradictionModeA)
{
qRelMSF++;
}
//setup subQ
byte ADR = 1; //absent some kind of policy for how to set it, this is a safe assumption:
ss_gap.sq.SetStatus(ADR, tocSynth.Result.TOCItems[1].Control);
ss_gap.sq.q_tno = BCD2.FromDecimal(1);
ss_gap.sq.q_index = BCD2.FromDecimal(0);
ss_gap.sq.AP_Timestamp = i;
ss_gap.sq.Timestamp = qRelMSF;
//setup subP
ss_gap.Pause = true;
}
//build the sectors:
//set up as many sectors as we have img/sub for, even if the TOC doesnt reference them
//(the TOC is unreliable, and the Track records are redundant)
for (int i = 0; i < NumImgSectors; i++)
{
disc._Sectors.Add(synth);
}
return(disc);
}
void FromCueInternal(Cue cue, string cueDir, CueBinPrefs prefs)
{
//TODO - add cue directory to CueBinPrefs???? could make things cleaner...
var session = new DiscTOC.Session {
num = 1
};
TOC.Sessions.Add(session);
var pregap_sector = new Sector_Zero();
int curr_track = 1;
foreach (var cue_file in cue.Files)
{
//structural validation
if (cue_file.Tracks.Count < 1)
{
throw new Cue.CueBrokenException("`You must specify at least one track per file.`");
}
string blobPath = Path.Combine(cueDir, cue_file.Path);
if (CueFileResolver.ContainsKey(cue_file.Path))
{
blobPath = CueFileResolver[cue_file.Path];
}
int blob_sectorsize = Cue.BINSectorSizeForTrackType(cue_file.Tracks[0].TrackType);
int blob_length_aba;
long blob_length_bytes;
IBlob cue_blob;
//try any way we can to acquire a file
if (!File.Exists(blobPath) && prefs.ExtensionAware)
{
blobPath = FindAlternateExtensionFile(blobPath, prefs.CaseSensitive, cueDir);
}
if (!File.Exists(blobPath))
{
throw new DiscReferenceException(blobPath, "");
}
//some simple rules to mutate the file type if we received something fishy
string blobPathExt = Path.GetExtension(blobPath).ToLower();
if (blobPathExt == ".ape")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".mp3")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".mpc")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".flac")
{
cue_file.FileType = Cue.CueFileType.Wave;
}
if (blobPathExt == ".ecm")
{
cue_file.FileType = Cue.CueFileType.ECM;
}
if (cue_file.FileType == Cue.CueFileType.Binary || cue_file.FileType == Cue.CueFileType.Unspecified)
{
//make a blob for the file
Blob_RawFile blob = new Blob_RawFile {
PhysicalPath = blobPath
};
Blobs.Add(blob);
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else if (cue_file.FileType == Cue.CueFileType.ECM)
{
if (!Blob_ECM.IsECM(blobPath))
{
throw new DiscReferenceException(blobPath, "an ECM file was specified or detected, but it isn't a valid ECM file. You've got issues. Consult your iso vendor.");
}
Blob_ECM blob = new Blob_ECM();
Blobs.Add(blob);
blob.Parse(blobPath);
cue_blob = blob;
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
}
else if (cue_file.FileType == Cue.CueFileType.Wave)
{
Blob_WaveFile blob = new Blob_WaveFile();
Blobs.Add(blob);
try
{
//check whether we can load the wav directly
bool loaded = false;
if (File.Exists(blobPath) && Path.GetExtension(blobPath).ToUpper() == ".WAV")
{
try
{
blob.Load(blobPath);
loaded = true;
}
catch
{
}
}
//if that didnt work or wasnt possible, try loading it through ffmpeg
if (!loaded)
{
FFMpeg ffmpeg = new FFMpeg();
if (!ffmpeg.QueryServiceAvailable())
{
throw new DiscReferenceException(blobPath, "No decoding service was available (make sure ffmpeg.exe is available. even though this may be a wav, ffmpeg is used to load oddly formatted wave files. If you object to this, please send us a note and we'll see what we can do. It shouldn't be too hard.)");
}
AudioDecoder dec = new AudioDecoder();
byte[] buf = dec.AcquireWaveData(blobPath);
blob.Load(new MemoryStream(buf));
WasSlowLoad = true;
}
}
catch (Exception ex)
{
throw new DiscReferenceException(blobPath, ex);
}
blob_length_aba = (int)(blob.Length / blob_sectorsize);
blob_length_bytes = blob.Length;
cue_blob = blob;
}
else
{
throw new Exception("Internal error - Unhandled cue blob type");
}
//TODO - make CueTimestamp better, and also make it a struct, and also just make it DiscTimestamp
//start timekeeping for the blob. every time we hit an index, this will advance
int blob_timestamp = 0;
//because we can have different size sectors in a blob, we need to keep a file cursor within the blob
long blob_cursor = 0;
//the aba that this cue blob starts on
int blob_disc_aba_start = Sectors.Count;
//for each track within the file, create an index 0 if it is missing.
//also check to make sure there is an index 1
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
if (!cue_track.Indexes.ContainsKey(1))
{
throw new Cue.CueBrokenException("Track was missing an index 01");
}
if (!cue_track.Indexes.ContainsKey(0))
{
//index 0 will default to the same as index 1.
//i am not sure whether it is valid to have two indexes with the same timestamp.
//we will do this to simplify some processing, but we can purge it in a later pass if we need to.
var cti = new Cue.CueTrackIndex(0);
cue_track.Indexes[0] = cti;
cti.Timestamp = cue_track.Indexes[1].Timestamp;
}
}
//validate that the first index in the file is 00:00:00
if (cue_file.Tracks[0].Indexes[0].Timestamp.ABA != 0)
{
throw new Cue.CueBrokenException("`The first index of a blob must start at 00:00:00.`");
}
//for each track within the file:
for (int t = 0; t < cue_file.Tracks.Count; t++)
{
var cue_track = cue_file.Tracks[t];
//record the disc ABA that this track started on
int track_disc_aba_start = Sectors.Count;
//record the pregap location. it will default to the start of the track unless we supplied a pregap command
int track_disc_pregap_aba = track_disc_aba_start;
int blob_track_start = blob_timestamp;
//once upon a time we had a check here to prevent a single blob from containing variant sector sizes. but we support that now.
//check integrity of track sequence and setup data structures
//TODO - check for skipped tracks in cue parser instead
if (cue_track.TrackNum != curr_track)
{
throw new Cue.CueBrokenException("Found a cue with skipped tracks");
}
var toc_track = new DiscTOC.Track();
toc_track.num = curr_track;
toc_track.TrackType = cue_track.TrackType;
session.Tracks.Add(toc_track);
if (curr_track == 1)
{
if (cue_track.PreGap.ABA != 0)
{
throw new InvalidOperationException("not supported (yet): cue files with track 1 pregaps");
}
//but now we add one anyway, because every existing cue+bin seems to implicitly specify this
cue_track.PreGap = new Timestamp(150);
}
//check whether a pregap is requested.
//this causes empty sectors to get generated without consuming data from the blob
if (cue_track.PreGap.ABA > 0)
{
for (int i = 0; i < cue_track.PreGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
}
//look ahead to the next track's index 1 so we can see how long this track's last index is
//or, for the last track, use the length of the file
int track_length_aba;
if (t == cue_file.Tracks.Count - 1)
{
track_length_aba = blob_length_aba - blob_timestamp;
}
else
{
track_length_aba = cue_file.Tracks[t + 1].Indexes[1].Timestamp.ABA - blob_timestamp;
}
//toc_track.length_aba = track_length_aba; //xxx
//find out how many indexes we have
int num_indexes = 0;
for (num_indexes = 0; num_indexes <= 99; num_indexes++)
{
if (!cue_track.Indexes.ContainsKey(num_indexes))
{
break;
}
}
//for each index, calculate length of index and then emit it
for (int index = 0; index < num_indexes; index++)
{
bool is_last_index = index == num_indexes - 1;
//install index into hierarchy
var toc_index = new DiscTOC.Index {
num = index
};
toc_track.Indexes.Add(toc_index);
if (index == 0)
{
toc_index.aba = track_disc_pregap_aba - (cue_track.Indexes[1].Timestamp.ABA - cue_track.Indexes[0].Timestamp.ABA);
}
else
{
toc_index.aba = Sectors.Count;
}
//calculate length of the index
//if it is the last index then we use our calculation from before, otherwise we check the next index
int index_length_aba;
if (is_last_index)
{
index_length_aba = track_length_aba - (blob_timestamp - blob_track_start);
}
else
{
index_length_aba = cue_track.Indexes[index + 1].Timestamp.ABA - blob_timestamp;
}
//emit sectors
for (int aba = 0; aba < index_length_aba; aba++)
{
bool is_last_aba_in_index = (aba == index_length_aba - 1);
bool is_last_aba_in_track = is_last_aba_in_index && is_last_index;
switch (cue_track.TrackType)
{
case ETrackType.Audio: //all 2352 bytes are present
case ETrackType.Mode1_2352: //2352 bytes are present, containing 2048 bytes of user data as well as ECM
case ETrackType.Mode2_2352: //2352 bytes are present, containing the entirety of a mode2 sector (could be form0,1,2)
{
//these cases are all 2352 bytes
//in all these cases, either no ECM is present or ECM is provided.
//so we just emit a Sector_Raw
Sector_RawBlob sector_rawblob = new Sector_RawBlob
{
Blob = cue_blob,
Offset = blob_cursor
};
blob_cursor += 2352;
Sector_Mode1_or_Mode2_2352 sector_raw;
if (cue_track.TrackType == ETrackType.Mode1_2352)
{
sector_raw = new Sector_Mode1_2352();
}
else if (cue_track.TrackType == ETrackType.Audio)
{
sector_raw = new Sector_Mode1_2352(); //TODO should probably make a new sector adapter which errors if 2048B are requested
}
else if (cue_track.TrackType == ETrackType.Mode2_2352)
{
sector_raw = new Sector_Mode2_2352();
}
else
{
throw new InvalidOperationException();
}
sector_raw.BaseSector = sector_rawblob;
Sectors.Add(new SectorEntry(sector_raw));
break;
}
case ETrackType.Mode1_2048:
//2048 bytes are present. ECM needs to be generated to create a full sector
{
//ECM needs to know the sector number so we have to record that here
int curr_disc_aba = Sectors.Count;
var sector_2048 = new Sector_Mode1_2048(curr_disc_aba + 150)
{
Blob = new ECMCacheBlob(cue_blob),
Offset = blob_cursor
};
blob_cursor += 2048;
Sectors.Add(new SectorEntry(sector_2048));
break;
}
} //switch(TrackType)
//we've emitted an ABA, so consume it from the blob
blob_timestamp++;
} //aba emit loop
} //index loop
//check whether a postgap is requested. if it is, we need to generate silent sectors
for (int i = 0; i < cue_track.PostGap.ABA; i++)
{
Sectors.Add(new SectorEntry(pregap_sector));
}
//we're done with the track now.
//record its length:
toc_track.length_aba = Sectors.Count - toc_track.Indexes[1].aba;
curr_track++;
//if we ran off the end of the blob, pad it with zeroes, I guess
if (blob_cursor > blob_length_bytes)
{
//mutate the blob to an encapsulating Blob_ZeroPadAdapter
Blobs[Blobs.Count - 1] = new Blob_ZeroPadAdapter(Blobs[Blobs.Count - 1], blob_length_bytes, blob_cursor - blob_length_bytes);
}
} //track loop
} //file loop
//finally, analyze the length of the sessions and the entire disc by summing the lengths of the tracks
//this is a little more complex than it looks, because the length of a thing is not determined by summing it
//but rather by the difference in abas between start and end
TOC.length_aba = 0;
foreach (var toc_session in TOC.Sessions)
{
var firstTrack = toc_session.Tracks[0];
//track 0, index 0 is actually -150. but cue sheets will never say that
//firstTrack.Indexes[0].aba -= 150;
var lastTrack = toc_session.Tracks[toc_session.Tracks.Count - 1];
session.length_aba = lastTrack.Indexes[1].aba + lastTrack.length_aba - firstTrack.Indexes[0].aba;
TOC.length_aba += toc_session.length_aba;
}
}