public async override Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
// TODO: Validate buffer
if (_disposed)
{
return(0);
}
try
{
cancellationToken.ThrowIfCancellationRequested();
if (_expectChunkHeader)
{
System.Diagnostics.Debug.Assert(_chunkBytesRemaining == 0);
string headerLine = await _inner.ReadLineAsync(cancellationToken);
if (!long.TryParse(headerLine, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out _chunkBytesRemaining))
{
throw new IOException("Invalid chunk header: " + headerLine);
}
_expectChunkHeader = false;
}
int read = 0;
if (_chunkBytesRemaining > 0)
{
// Not the last (empty) chunk.
int toRead = (int)Math.Min(count, _chunkBytesRemaining);
read = await _inner.ReadAsync(buffer, offset, toRead, cancellationToken);
_chunkBytesRemaining -= read;
System.Diagnostics.Debug.Assert(_chunkBytesRemaining >= 0, "Negative bytes remaining? " + _chunkBytesRemaining);
}
// TODO: else, drain trailer headers.
if (_chunkBytesRemaining == 0)
{
// End of chunk, read the terminator CRLF
string trailerLine = await _inner.ReadLineAsync(cancellationToken);
System.Diagnostics.Debug.Assert(string.IsNullOrEmpty(trailerLine));
_expectChunkHeader = true;
}
if (read == 0)
{
Dispose();
}
return(read);
}
catch (Exception)
{
Dispose();
throw;
}
}
public async override Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
// TODO: Validate buffer
ThrowIfDisposed();
if (_done)
{
return(0);
}
cancellationToken.ThrowIfCancellationRequested();
if (_chunkBytesRemaining == 0)
{
string headerLine = await _inner.ReadLineAsync(cancellationToken).ConfigureAwait(false);
if (!long.TryParse(headerLine, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out _chunkBytesRemaining))
{
throw new IOException("Invalid chunk header: " + headerLine);
}
}
int read = 0;
if (_chunkBytesRemaining > 0)
{
int toRead = (int)Math.Min(count, _chunkBytesRemaining);
read = await _inner.ReadAsync(buffer, offset, toRead, cancellationToken).ConfigureAwait(false);
if (read == 0)
{
throw new EndOfStreamException();
}
_chunkBytesRemaining -= read;
}
if (_chunkBytesRemaining == 0)
{
// End of chunk, read the terminator CRLF
var trailer = await _inner.ReadLineAsync(cancellationToken).ConfigureAwait(false);
if (trailer.Length > 0)
{
throw new IOException("Invalid chunk trailer");
}
if (read == 0)
{
_done = true;
}
}
return(read);
}
