public BufferByteReader(DiskReadProvider stream, int buffersize, long streamstart, long streamlen)
{
this.streamLen = streamlen;
this.stream = stream;
this.streamStart = streamstart;
if (buffersize > streamlen)
{
isSingle = true;
buffersize = (int)streamlen;
this.bufferSize = buffersize;
buffer = new byte[buffersize];
UpdateBufferSingle();
}
else
{
this.bufferSize = buffersize;
buffer = new byte[buffersize];
bufferNext = new byte[buffersize];
UpdateBuffer(pos, true);
}
}
protected void Open()
{
MidiFileReader = File.Open(filepath, FileMode.Open);
ReadProvider = new DiskReadProvider(MidiFileReader);
ParseHeaderChunk();
while (MidiFileReader.Position < MidiFileReader.Length)
{
try
{
ParseTrackChunk();
}
catch
{
if (trackBeginnings.Count == 0)
{
throw new Exception("Corrupt first track chunk header");
}
else
{
ParseStatusText = "Chunk " + (trackcount - 1) + " has corrupt length\nCalculating length...";
var pos = trackBeginnings.Last();
var reader = new BufferByteReader(ReadProvider, 1000000, pos, MidiFileReader.Length - pos);
try
{
var len = MIDITrackParser.GetCorruptChunkLength(reader);
trackLengths[trackLengths.Count - 1] = (uint)len;
MidiFileReader.Position = pos + len;
}
catch { throw new Exception("Could not determine length of corrupt chunk"); }
}
}
ParseNumber += 2;
cancel.ThrowIfCancellationRequested();
}
parsers = new MIDITrackParser[trackcount];
}