public EBMLReader(IEBMLDataSource dataSrc, EBMLDocType ebmlDoc) {
this.dataSrc = dataSrc;
this.docType = ebmlDoc;
this.bytePatterns = new BytePatterns(ebmlDoc.CreateSyncPoints());
lastElementPos = dataSrc.HasKnownLength ? dataSrc.Length : ~VIntConsts.UNKNOWN_LENGTH;
}
public void SyncTo(BytePatterns bytePatterns, long seekUntil)
{
long foundPosition = -1;
bytePatterns.Match(data, (int)Position, (pattern, i) => { foundPosition = i; return false; });
if(foundPosition > seekUntil) foundPosition = seekUntil;
if(foundPosition != -1) Position = foundPosition;
}
public void SyncTo(BytePatterns bytePatterns, long seekUntil)
{
bytePatterns.Reset();
var b = new byte[1024 * 1024];
int foundRelativePosition = int.MinValue;
while(foundRelativePosition == int.MinValue && !EOF) {
if(seekUntil != -1 || Position < seekUntil) source.Read(b, 0, b.Length); else break;
bytePatterns.Match(b, 0, (pattern, i) => { foundRelativePosition = i; return false; });
}
if(seekUntil != -1 && Position - b.Length + foundRelativePosition > seekUntil) foundRelativePosition = b.Length - (int)(Position - seekUntil);
if(foundRelativePosition != int.MinValue) source.Position -= b.Length - foundRelativePosition;
}
public void SyncTo(BytePatterns bytePatterns, long seekUntil)
{
throw new NotSupportedException();
}
public void SyncTo(BytePatterns bytePatterns, long seekUntil)
{
bytePatterns.Reset();
int foundRelativePosition = -1;
while(foundRelativePosition < 0 && !EOF) {
bytePatterns.Match(blocks.Current, (int)relativePosition, (pattern, i) => { foundRelativePosition = i; return false; });
if(foundRelativePosition < 0) {
bytePatterns.Reset();
if(seekUntil == -1 || absolutePosition + BlockSize <= seekUntil) advance(); else break;
}
}
if(seekUntil != -1 && absolutePosition + foundRelativePosition > seekUntil) foundRelativePosition = (int)(seekUntil - absolutePosition);
if(foundRelativePosition >= 0) relativePosition = foundRelativePosition;
}
