Initial import.

1 files changed, 168 insertions, 0 deletions

diff --git a/src/client/cl_net_chan.c b/src/client/cl_net_chan.c
new file mode 100644
index 0000000..561f322
--- /dev/null
+++ b/src/client/cl_net_chan.c
@@ -0,0 +1,168 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2009 Darklegion Development
+
+This file is part of Tremulous.
+
+Tremulous is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Tremulous is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Tremulous; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+#include "../qcommon/q_shared.h"
+#include "../qcommon/qcommon.h"
+#include "client.h"
+
+/*
+==============
+CL_Netchan_Encode
+
+	// first 12 bytes of the data are always:
+	long serverId;
+	long messageAcknowledge;
+	long reliableAcknowledge;
+
+==============
+*/
+static void CL_Netchan_Encode( msg_t *msg ) {
+	int serverId, messageAcknowledge, reliableAcknowledge;
+	int i, index, srdc, sbit, soob;
+	byte key, *string;
+
+	if ( msg->cursize <= CL_ENCODE_START ) {
+		return;
+	}
+
+        srdc = msg->readcount;
+        sbit = msg->bit;
+        soob = msg->oob;
+        
+        msg->bit = 0;
+        msg->readcount = 0;
+        msg->oob = 0;
+        
+        serverId = MSG_ReadLong(msg);
+	messageAcknowledge = MSG_ReadLong(msg);
+	reliableAcknowledge = MSG_ReadLong(msg);
+
+        msg->oob = soob;
+        msg->bit = sbit;
+        msg->readcount = srdc;
+        
+	string = (byte *)clc.serverCommands[ reliableAcknowledge & (MAX_RELIABLE_COMMANDS-1) ];
+	index = 0;
+	//
+	key = clc.challenge ^ serverId ^ messageAcknowledge;
+	for (i = CL_ENCODE_START; i < msg->cursize; i++) {
+		// modify the key with the last received now acknowledged server command
+		if (!string[index])
+			index = 0;
+		if (string[index] > 127) {
+			key ^= '.' << (i & 1);
+		}
+		else {
+			key ^= string[index] << (i & 1);
+		}
+		index++;
+		// encode the data with this key
+		*(msg->data + i) = (*(msg->data + i)) ^ key;
+	}
+}
+
+/*
+==============
+CL_Netchan_Decode
+
+	// first four bytes of the data are always:
+	long reliableAcknowledge;
+
+==============
+*/
+static void CL_Netchan_Decode( msg_t *msg ) {
+	long reliableAcknowledge, i, index;
+	byte key, *string;
+        int	srdc, sbit, soob;
+
+        srdc = msg->readcount;
+        sbit = msg->bit;
+        soob = msg->oob;
+        
+        msg->oob = 0;
+        
+	reliableAcknowledge = MSG_ReadLong(msg);
+
+        msg->oob = soob;
+        msg->bit = sbit;
+        msg->readcount = srdc;
+
+	string = (byte *) clc.reliableCommands[ reliableAcknowledge & (MAX_RELIABLE_COMMANDS-1) ];
+	index = 0;
+	// xor the client challenge with the netchan sequence number (need something that changes every message)
+	key = clc.challenge ^ LittleLong( *(unsigned *)msg->data );
+	for (i = msg->readcount + CL_DECODE_START; i < msg->cursize; i++) {
+		// modify the key with the last sent and with this message acknowledged client command
+		if (!string[index])
+			index = 0;
+		if (string[index] > 127) {
+			key ^= '.' << (i & 1);
+		}
+		else {
+			key ^= string[index] << (i & 1);
+		}
+		index++;
+		// decode the data with this key
+		*(msg->data + i) = *(msg->data + i) ^ key;
+	}
+}
+
+/*
+=================
+CL_Netchan_TransmitNextFragment
+=================
+*/
+void CL_Netchan_TransmitNextFragment( netchan_t *chan ) {
+	Netchan_TransmitNextFragment( chan );
+}
+
+/*
+===============
+CL_Netchan_Transmit
+================
+*/
+void CL_Netchan_Transmit( netchan_t *chan, msg_t* msg ) {
+	MSG_WriteByte( msg, clc_EOF );
+
+	CL_Netchan_Encode( msg );
+	Netchan_Transmit( chan, msg->cursize, msg->data );
+}
+
+extern 	int oldsize;
+int newsize = 0;
+
+/*
+=================
+CL_Netchan_Process
+=================
+*/
+qboolean CL_Netchan_Process( netchan_t *chan, msg_t *msg ) {
+	int ret;
+
+	ret = Netchan_Process( chan, msg );
+	if (!ret)
+		return qfalse;
+	CL_Netchan_Decode( msg );
+	newsize += msg->cursize;
+	return qtrue;
+}