public override long Seek(long offset, SeekOrigin origin)
{
if (!CanSeek)
{
throw new NotSupportedException();
}
Console.WriteLine("seeking from origin " + origin + " to offset " + offset);
long newPos = 0;
switch (origin)
{
case SeekOrigin.Begin:
newPos = offset;
break;
case SeekOrigin.Current:
newPos = Position + offset;
break;
case SeekOrigin.End:
newPos = Length + offset;
break;
}
long streamLengthSum = 0;
int streamIndex = 0;
while (streamLengthSum + subStreams[streamIndex].Length < newPos)
{
streamLengthSum += subStreams[streamIndex].Length;
streamIndex++;
}
if (CurrentSubStreamIndex != streamIndex)
{
CurrentSubStreamIndex = streamIndex;
}
CurrentSubStream.Seek(newPos - streamLengthSum, SeekOrigin.Begin);
return(Position);
}
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = CurrentSubStream.Read(buffer, offset, count);
if (bytesRead == 0 && count > 0)
{
// we reached the EOF
Console.WriteLine("end of substream " + currentSubStreamIndex + " reached");
if (LastSubStream)
{
// we reached not only EOF, but EOF of the last stream (so we're at the very end)
Console.WriteLine("end of stream reached");
return(bytesRead);
}
// switch to and continue with next file stream
CurrentSubStreamIndex++;
return(Read(buffer, offset, count));
}
return(bytesRead);
}
public override void Flush()
{
CurrentSubStream.Flush();
}
