/// <summary>
/// Entry point for post-exchange data received from the Tcp Socket
/// </summary>
private void OnDataReceived(DataReceivedEventArgs args)
{
if (args.Owner.Client.Equals(_clientSocket.Client))
{
// retrieve and buffer the packet
ProcessAndPush(_rcvBuffer, args.Owner.Data);
// check for sequenced packets in the queue
if (_rcvBuffer.Count > 0)
{
do
{
// process if in sequence or break
if (!_rcvBuffer.Exists(_rcvSequence))
break;
else
Process(_rcvBuffer.Pop(_rcvSequence));
}
while (true);
}
}
}
/// <summary>
/// The ReceiveAsync callback
/// </summary>
///
/// <param name="Ar">The IAsyncResult</param>
///
/// <exception cref="CryptoSocketException">Thrown on socket error or if the Tcp stream is larger than the maximum allocation size</exception>
private void ReceiveCallback(IAsyncResult Ar)
{
// Retrieve the state object and the client socket from the asynchronous state object
StateToken state = (StateToken)Ar.AsyncState;
Socket clt = state.Client;
try
{
// Read data from the remote device.
int bytesRead = clt.EndReceive(Ar);
if (bytesRead > MaxAllocation)
throw new CryptoSocketException("TcpSocket:ReceiveCallback", string.Format("The Tcp stream is larger than the maximum allocation size of {0} bytes!", MaxAllocation), new InvalidOperationException());
if (bytesRead > 0)
{
// there might be more data, so store the data received so far
state.Data.Write(state.Buffer, 0, bytesRead);
// all the data has arrived; put it in response.
if (state.Data.Length > 1)
{
// return the data
if (DataReceived != null)
{
state.Data.Seek(0, SeekOrigin.Begin);
DataReceivedEventArgs args = new DataReceivedEventArgs(state, 0);
DataReceived(args);
}
}
if (state.Client.Connected)
{
// clear the state
state.Data = new MemoryStream();
// get more data
clt.BeginReceive(state.Buffer, 0, state.Buffer.Length, 0, new AsyncCallback(ReceiveCallback), state);
}
}
}
catch (SocketException se)
{
// expected when remote connection goes down
if (se.ErrorCode != (int)SocketError.ConnectionReset && se.ErrorCode != (int)SocketError.Disconnecting)
throw new CryptoSocketException("TcpSocket:ReceiveCallback", "The Tcp receiver has failed!", se);
}
catch (ObjectDisposedException)
{
// disconnected
if (DisConnected != null)
DisConnected(this, SocketError.NotConnected);
}
catch (NullReferenceException)
{
// expected when shutting down
}
catch
{
throw;
}
}
