private IAsyncResult StartInternalRead(Socket streamSocket, SocketStreamAsyncArgs readArgs, byte[] buffer, int offset, int size, AsyncCallback callback, object state)
{
IAsyncResult asyncResult;
try
{
SocketStream.IoReq ioReq = new SocketStream.IoReq(state, callback);
ioReq.RecordUserBuffer(buffer, offset, size);
ioReq.InternalBuffer = readArgs.InternalBuffer;
readArgs.SetBuffer(ioReq.InternalBuffer.Buffer, 0, size);
readArgs.UserToken = ioReq;
SocketStream.Tracer.TraceDebug((long)this.GetHashCode(), "ReceiveAsync called");
if (!streamSocket.ReceiveAsync(readArgs))
{
SocketStream.Tracer.TraceDebug((long)this.GetHashCode(), "ReceiveAsync sync completion");
this.IO_Completed(null, readArgs);
}
asyncResult = ioReq.AsyncResult;
}
catch (Exception ex)
{
if (ex is ThreadAbortException || ex is StackOverflowException || ex is OutOfMemoryException)
{
throw;
}
throw new IOException(ex.Message, ex);
}
return(asyncResult);
}
private int EndReadFromInternalBuf(LazyAsyncResult result)
{
SocketStream.IoReq ioReq = result.AsyncObject as SocketStream.IoReq;
if (ioReq == null)
{
throw new ArgumentException("AsyncObject corrupt");
}
result.InternalWaitForCompletion();
if (ioReq.SocketError != SocketError.Success)
{
throw new SocketException((int)ioReq.SocketError);
}
return(ioReq.BytesTransferred);
}
private void ProcessReceive(SocketAsyncEventArgs e)
{
SocketStream.IoReq ioReq = e.UserToken as SocketStream.IoReq;
if (ioReq == null)
{
throw new ArgumentException("UserToken must be ReadReq");
}
try
{
ioReq.SocketError = e.SocketError;
ioReq.BytesTransferred = e.BytesTransferred;
Array.Copy(ioReq.InternalBuffer.Buffer, 0, ioReq.UserBuffer, ioReq.UserOffset, ioReq.BytesTransferred);
ioReq.InternalBuffer = null;
e.SetBuffer(null, 0, 0);
}
finally
{
SocketStream.Tracer.TraceDebug((long)this.GetHashCode(), "ProcessReceive marks read idle");
Interlocked.Exchange(ref this.m_readIsBusy, 0);
ioReq.Completed = true;
}
ioReq.AsyncResult.InvokeCallback();
}