async Task <int> EnsureReadAsync(byte[] buffer, int offset, int size, CancellationToken cancellationToken)
{
byte[] morebytes = null;
int nbytes = 0;
while (nbytes == 0 && ChunkStream.WantMore && !cancellationToken.IsCancellationRequested)
{
int localsize = ChunkStream.ChunkLeft;
if (localsize <= 0) // not read chunk size yet
{
localsize = 1024;
}
else if (localsize > 16384)
{
localsize = 16384;
}
if (morebytes == null || morebytes.Length < localsize)
{
morebytes = new byte[localsize];
}
int nread = await InnerStream.ReadAsync(morebytes, 0, localsize, cancellationToken).ConfigureAwait(false);
if (nread <= 0)
{
return(0); // Error
}
ChunkStream.Write(morebytes, 0, nread);
nbytes += ChunkStream.Read(buffer, offset + nbytes, size - nbytes);
}
return(nbytes);
}
// To be called on chunkedRead when we can read no data from the MonoChunkStream yet
int EnsureRead(byte [] buffer, int offset, int size)
{
byte [] morebytes = null;
int nbytes = 0;
while (nbytes == 0 && chunkStream.WantMore)
{
int localsize = chunkStream.ChunkLeft;
if (localsize <= 0) // not read chunk size yet
{
localsize = 1024;
}
else if (localsize > 16384)
{
localsize = 16384;
}
if (morebytes == null || morebytes.Length < localsize)
{
morebytes = new byte [localsize];
}
int nread = nstream.Read(morebytes, 0, localsize);
if (nread <= 0)
{
return(0); // Error
}
chunkStream.Write(morebytes, 0, nread);
nbytes += chunkStream.Read(buffer, offset + nbytes, size - nbytes);
}
return(nbytes);
}
public override IAsyncResult BeginRead(byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
if (disposed)
{
throw new ObjectDisposedException(GetType().ToString());
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
int len = buffer.Length;
if (offset < 0 || offset > len)
{
throw new ArgumentOutOfRangeException("offset exceeds the size of buffer");
}
if (count < 0 || offset > len - count)
{
throw new ArgumentOutOfRangeException("offset+size exceeds the size of buffer");
}
HttpStreamAsyncResult ares = new HttpStreamAsyncResult();
ares.Callback = cback;
ares.State = state;
if (no_more_data)
{
ares.Complete();
return(ares);
}
int nread = decoder.Read(buffer, offset, count);
offset += nread;
count -= nread;
if (count == 0)
{
// got all we wanted, no need to bother the decoder yet
ares.Count = nread;
ares.Complete();
return(ares);
}
if (!decoder.WantMore)
{
no_more_data = nread == 0;
ares.Count = nread;
ares.Complete();
return(ares);
}
ares.Buffer = new byte [8192];
ares.Offset = 0;
ares.Count = 8192;
ReadBufferState rb = new ReadBufferState(buffer, offset, count, ares);
rb.InitialCount += nread;
base.BeginRead(ares.Buffer, ares.Offset, ares.Count, OnRead, rb);
return(ares);
}