/** called to open a channel to a remote system */
public static void Setup(NetworkChannel chan, int sock, NetworkAddress adr, int qport) {
// memset (chan, 0, sizeof(*chan));
chan.clear();
chan.sock = sock;
chan.remote_address.set(adr);
chan.qport = qport;
chan.last_received = Globals.curtime;
chan.incoming_sequence = 0;
chan.outgoing_sequence = 1;
chan.message = Buffer.wrap(chan.message_buf).order(ByteOrder.LITTLE_ENDIAN);
chan.message.allowoverflow = true;
}
/**
* called when the current net_message is from remote_address modifies net_message so that it
* points to the packet payload =================
*/
public static boolean Process(NetworkChannel chan, Buffer msg) {
int sequence, sequence_ack;
int reliable_ack, reliable_message;
int qport;
// get sequence numbers
msg.reset();
sequence = msg.getInt();
sequence_ack = msg.getInt();
// read the qport if we are a server
if (chan.sock == Constants.NS_SERVER) qport = msg.getShort();
// achtung unsigned int
reliable_message = sequence >>> 31;
reliable_ack = sequence_ack >>> 31;
sequence &= ~(1 << 31);
sequence_ack &= ~(1 << 31);
if (showpackets.value != 0) {
if (reliable_message != 0)
Com.Printf(
// "recv %4i : s=%i reliable=%i ack=%i rack=%i\n"
"recv "
+ msg.cursize
+ " : s="
+ sequence
+ " reliable="
+ (chan.incoming_reliable_sequence ^ 1)
+ " ack="
+ sequence_ack
+ " rack="
+ reliable_ack
+ "\n");
else
Com.Printf(
// "recv %4i : s=%i ack=%i rack=%i\n"
"recv "
+ msg.cursize
+ " : s="
+ sequence
+ " ack="
+ sequence_ack
+ " rack="
+ reliable_ack
+ "\n");
}
//
// discard stale or duplicated packets
//
if (sequence <= chan.incoming_sequence) {
if (showdrop.value != 0)
Com.Printf(
NET.AdrToString(chan.remote_address)
+ ":Out of order packet "
+ sequence
+ " at "
+ chan.incoming_sequence
+ "\n");
return false;
}
//
// dropped packets don't keep the message from being used
//
chan.dropped = sequence - (chan.incoming_sequence + 1);
if (chan.dropped > 0) {
if (showdrop.value != 0)
Com.Printf(
NET.AdrToString(chan.remote_address)
+ ":Dropped "
+ chan.dropped
+ " packets at "
+ sequence
+ "\n");
}
//
// if the current outgoing reliable message has been acknowledged
// clear the buffer to make way for the next
//
if (reliable_ack == chan.reliable_sequence) chan.reliable_length = 0; // it has been received
//
// if this message contains a reliable message, bump
// incoming_reliable_sequence
//
chan.incoming_sequence = sequence;
chan.incoming_acknowledged = sequence_ack;
chan.incoming_reliable_acknowledged = reliable_ack;
if (reliable_message != 0) {
chan.incoming_reliable_sequence ^= 1;
}
//
// the message can now be read from the current message pointer
//
chan.last_received = (int) Globals.curtime;
return true;
}