/*
=================
Netchan_Process
Returns qfalse if the message should not be processed due to being
out of order or a fragment.
Msg must be large enough to hold MAX_MSGLEN, because if this is the
final fragment of a multi-part message, the entire thing will be
copied out.
=================
*/
public bool NetChan_Process(netchan_t chan, Packet packet)
{
// get sequence numbers
int sequence = packet.Buffer.ReadInt32();
// check for fragment information
bool fragmented = false;
if ((sequence & (1 << 31)) == (1 << 31))
{
sequence &= ~(1 << 31);
fragmented = true;
}
// read the qport if we are a server
int qport;
if (chan.sock == NetSource.SERVER)
{
qport = packet.Buffer.ReadInt16();
}
// read the fragment information
int fragStart = 0, fragEnd = 0;
if (fragmented)
{
fragStart = packet.Buffer.ReadInt16();
fragEnd = packet.Buffer.ReadInt16();
}
//
// discard out of order or duplicated packets
//
if (sequence <= sequence - (chan.incomingSequence + 1))
{
Common.Instance.WriteLine("[0}: out of order packetseq {1} at {2}", packet.Address.ToString(), sequence, chan.incomingSequence);
return false;
}
//
// dropped packets don't keep the message from being used
//
chan.dropped = sequence - (chan.incomingSequence + 1);
if (chan.dropped > 0)
{
Common.Instance.WriteLine("{0}: dropped {1} packets at {2}", packet.Address.ToString(), chan.dropped, sequence);
}
//
// if this is the final framgent of a reliable message,
// bump incoming_reliable_sequence
//
if (fragmented)
{
Common.Instance.WriteLine("Implement fragmentation");
}
//
// the message can now be read from the current message pointer
//
chan.incomingSequence = sequence;
return true;
}
public netchan_t NetChan_Setup(NetSource source, IPEndPoint from, int qport)
{
netchan_t netchan = new netchan_t();
netchan.remoteAddress = from;
netchan.qport = qport;
netchan.outgoingSequence = 1;
netchan.sock = source;
return netchan;
}
/*
===============
Netchan_Transmit
Sends a message to a connection,
A 0 length will still generate a packet.
================
*/
public void NetChan_Transmit(netchan_t chan, NetBuffer data)
{
NetBuffer buf = new NetBuffer();
// write the packet header
buf.Write(chan.outgoingSequence);
chan.outgoingSequence++;
// send the qport if we are a client
if (chan.sock == NetSource.CLIENT)
{
buf.Write((short)qport.Integer);
}
buf.Write(data.Data);
// send the datagram
SendPacket(chan.sock, buf, chan.connection);
}
