void ReceiveCallback(IAsyncResult ar)
{
bool recsuccess = false;
RecState state = null;
try
{
int bytesgotten = S.EndReceive(ar);
state = (RecState)ar.AsyncState;
state.BytesSoFar += bytesgotten;
recsuccess = true;
#if DEBUG
Trace.WriteLine(String.Format("Receive Callback. Packet: {0} First packet: {1}, Bytes so far: {2}", state.PacketCount, state.IsPacketLength, state.BytesSoFar));
#endif
}
catch (SocketException)
{
OnError(ConnectionClosed);
}
if (recsuccess)
{
ProcessIncomingData(state);
}
}
void StartGetNewPacket()
{
RecState state = new RecState();
state.IsPacketLength = true;
state.Data = new byte[4];
state.PacketCount = PacketCount;
PacketCount++;
#if DEBUG
TempPackets.Add(state);
#endif
S.BeginReceive(state.Data, 0, 4, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
}
void ProcessIncomingData(RecState state)
{
if (state.IsPacketLength)
{
// First 4 bytes of a new packet.
state.PacketLength = BitConverter.ToInt32(state.Data, 0);
state.IsPacketLength = false;
state.BytesSoFar = 0;
state.Data = new byte[state.PacketLength];
S.BeginReceive(state.Data, 0, state.PacketLength, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
}
else
{
// Do something with data...
if (state.BytesSoFar < state.PacketLength)
{
// Missing data.
S.BeginReceive(state.Data, state.BytesSoFar, state.PacketLength - state.BytesSoFar, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
}
else
{
// Process data.
#if DEBUG
Trace.WriteLine("Complete packet.");
#endif
RCONPacket RetPack = new RCONPacket();
RetPack.ParseFromBytes(state.Data, this);
ProcessResponse(RetPack);
// Wait for new packet.
StartGetNewPacket();
}
}
}