public override int EndRead(IAsyncResult r)
{
WebAsyncResult result = (WebAsyncResult)r;
if (result.EndCalled)
{
int xx = result.NBytes;
return((xx >= 0) ? xx : 0);
}
result.EndCalled = true;
if (!result.IsCompleted)
{
int nbytes = -1;
try
{
nbytes = cnc.EndRead(request, result);
}
catch (Exception exc)
{
lock (locker)
{
pendingReads--;
if (pendingReads == 0)
{
pending.Set();
}
}
nextReadCalled = true;
cnc.Close(true);
result.SetCompleted(false, exc);
result.DoCallback();
throw;
}
if (nbytes < 0)
{
nbytes = 0;
read_eof = true;
}
totalRead += nbytes;
result.SetCompleted(false, nbytes + result.NBytes);
result.DoCallback();
if (nbytes == 0)
{
contentLength = totalRead;
}
}
lock (locker)
{
pendingReads--;
if (pendingReads == 0)
{
pending.Set();
}
}
if (totalRead >= contentLength && !nextReadCalled)
{
ReadAll();
}
int nb = result.NBytes;
return((nb >= 0) ? nb : 0);
}
public override IAsyncResult BeginWrite(byte[] buffer, int offset, int size, AsyncCallback cb, object state)
{
if (request.Aborted)
{
throw new WebException("The request was canceled.", null, WebExceptionStatus.RequestCanceled);
}
if (disposed)
{
throw new WebException("stream is closed", WebExceptionStatus.ConnectionClosed);
}
if (isRead)
{
throw new NotSupportedException("this stream does not allow writing");
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
int length = buffer.Length;
if (offset < 0 || length < offset)
{
throw new ArgumentOutOfRangeException("offset");
}
if (size < 0 || (length - offset) < size)
{
throw new ArgumentOutOfRangeException("size");
}
if (sendChunked)
{
lock (locker)
{
pendingWrites++;
pending.Reset();
}
}
WebAsyncResult result = new WebAsyncResult(cb, state);
AsyncCallback callback = new AsyncCallback(WriteAsyncCB);
if (sendChunked)
{
requestWritten = true;
string cSize = String.Format("{0:X}\r\n", size);
byte[] head = Encoding.ASCII.GetBytes(cSize);
int chunkSize = 2 + size + head.Length;
byte[] newBuffer = new byte[chunkSize];
Buffer.BlockCopy(head, 0, newBuffer, 0, head.Length);
Buffer.BlockCopy(buffer, offset, newBuffer, head.Length, size);
Buffer.BlockCopy(crlf, 0, newBuffer, head.Length + size, crlf.Length);
if (allowBuffering)
{
if (writeBuffer == null)
{
writeBuffer = new MemoryStream();
}
writeBuffer.Write(buffer, offset, size);
totalWritten += size;
}
buffer = newBuffer;
offset = 0;
size = chunkSize;
}
else
{
CheckWriteOverflow(request.ContentLength, totalWritten, size);
if (allowBuffering)
{
if (writeBuffer == null)
{
writeBuffer = new MemoryStream();
}
writeBuffer.Write(buffer, offset, size);
totalWritten += size;
if (request.ContentLength <= 0 || totalWritten < request.ContentLength)
{
result.SetCompleted(true, 0);
result.DoCallback();
return(result);
}
result.AsyncWriteAll = true;
requestWritten = true;
buffer = writeBuffer.GetBuffer();
offset = 0;
size = (int)totalWritten;
}
}
try
{
result.InnerAsyncResult = cnc.BeginWrite(request, buffer, offset, size, callback, result);
if (result.InnerAsyncResult == null)
{
if (!result.IsCompleted)
{
result.SetCompleted(true, 0);
}
result.DoCallback();
}
}
catch (Exception)
{
if (!IgnoreIOErrors)
{
throw;
}
result.SetCompleted(true, 0);
result.DoCallback();
}
totalWritten += size;
return(result);
}
public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback cb, object state)
{
if (disposed)
{
throw new WebException("stream is closed", WebExceptionStatus.ConnectionClosed);
}
if (!isRead)
{
throw new NotSupportedException("this stream does not allow reading");
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
int length = buffer.Length;
if (offset < 0 || length < offset)
{
throw new ArgumentOutOfRangeException("offset");
}
if (size < 0 || (length - offset) < size)
{
throw new ArgumentOutOfRangeException("size");
}
lock (locker)
{
pendingReads++;
pending.Reset();
}
WebAsyncResult result = new WebAsyncResult(cb, state, buffer, offset, size);
if (totalRead >= contentLength)
{
result.SetCompleted(true, -1);
result.DoCallback();
return(result);
}
int remaining = readBufferSize - readBufferOffset;
if (remaining > 0)
{
int copy = (remaining > size) ? size : remaining;
Buffer.BlockCopy(readBuffer, readBufferOffset, buffer, offset, copy);
readBufferOffset += copy;
offset += copy;
size -= copy;
totalRead += copy;
if (size == 0 || totalRead >= contentLength)
{
result.SetCompleted(true, copy);
result.DoCallback();
return(result);
}
result.NBytes = copy;
}
if (cb != null)
{
cb = cb_wrapper;
}
if (contentLength != Int32.MaxValue && contentLength - totalRead < size)
{
size = contentLength - totalRead;
}
if (!read_eof)
{
result.InnerAsyncResult = cnc.BeginRead(request, buffer, offset, size, cb, result);
}
else
{
result.SetCompleted(true, result.NBytes);
result.DoCallback();
}
return(result);
}
