mirror of
https://github.com/Q3Rally-Team/q3rally.git
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187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "../qcommon/q_shared.h"
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#include "../qcommon/qcommon.h"
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#include "client.h"
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#ifdef LEGACY_PROTOCOL
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/*
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==============
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CL_Netchan_Encode
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// first 12 bytes of the data are always:
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long serverId;
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long messageAcknowledge;
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long reliableAcknowledge;
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==============
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*/
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static void CL_Netchan_Encode( msg_t *msg ) {
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int serverId, messageAcknowledge, reliableAcknowledge;
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int i, index, srdc, sbit, soob;
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byte key, *string;
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if ( msg->cursize <= CL_ENCODE_START ) {
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return;
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}
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srdc = msg->readcount;
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sbit = msg->bit;
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soob = msg->oob;
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msg->bit = 0;
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msg->readcount = 0;
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msg->oob = 0;
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serverId = MSG_ReadLong(msg);
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messageAcknowledge = MSG_ReadLong(msg);
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reliableAcknowledge = MSG_ReadLong(msg);
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msg->oob = soob;
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msg->bit = sbit;
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msg->readcount = srdc;
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string = (byte *)clc.serverCommands[ reliableAcknowledge & (MAX_RELIABLE_COMMANDS-1) ];
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index = 0;
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//
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key = clc.challenge ^ serverId ^ messageAcknowledge;
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for (i = CL_ENCODE_START; i < msg->cursize; i++) {
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// modify the key with the last received now acknowledged server command
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if (!string[index])
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index = 0;
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if (string[index] > 127 || string[index] == '%') {
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key ^= '.' << (i & 1);
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}
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else {
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key ^= string[index] << (i & 1);
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}
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index++;
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// encode the data with this key
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*(msg->data + i) = (*(msg->data + i)) ^ key;
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}
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}
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/*
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==============
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CL_Netchan_Decode
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// first four bytes of the data are always:
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long reliableAcknowledge;
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==============
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*/
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static void CL_Netchan_Decode( msg_t *msg ) {
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long reliableAcknowledge, i, index;
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byte key, *string;
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int srdc, sbit, soob;
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srdc = msg->readcount;
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sbit = msg->bit;
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soob = msg->oob;
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msg->oob = 0;
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reliableAcknowledge = MSG_ReadLong(msg);
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msg->oob = soob;
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msg->bit = sbit;
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msg->readcount = srdc;
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string = (byte *) clc.reliableCommands[ reliableAcknowledge & (MAX_RELIABLE_COMMANDS-1) ];
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index = 0;
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// xor the client challenge with the netchan sequence number (need something that changes every message)
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key = clc.challenge ^ LittleLong( *(unsigned *)msg->data );
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for (i = msg->readcount + CL_DECODE_START; i < msg->cursize; i++) {
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// modify the key with the last sent and with this message acknowledged client command
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if (!string[index])
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index = 0;
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if (string[index] > 127 || string[index] == '%') {
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key ^= '.' << (i & 1);
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}
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else {
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key ^= string[index] << (i & 1);
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}
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index++;
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// decode the data with this key
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*(msg->data + i) = *(msg->data + i) ^ key;
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}
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}
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#endif
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/*
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=================
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CL_Netchan_TransmitNextFragment
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=================
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*/
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qboolean CL_Netchan_TransmitNextFragment(netchan_t *chan)
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{
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if(chan->unsentFragments)
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{
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Netchan_TransmitNextFragment(chan);
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return qtrue;
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}
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return qfalse;
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}
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/*
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===============
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CL_Netchan_Transmit
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================
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*/
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void CL_Netchan_Transmit( netchan_t *chan, msg_t* msg ) {
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MSG_WriteByte( msg, clc_EOF );
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#ifdef LEGACY_PROTOCOL
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if(chan->compat)
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CL_Netchan_Encode(msg);
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#endif
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Netchan_Transmit(chan, msg->cursize, msg->data);
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// Transmit all fragments without delay
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while(CL_Netchan_TransmitNextFragment(chan))
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{
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Com_DPrintf("WARNING: #462 unsent fragments (not supposed to happen!)\n");
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}
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}
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/*
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=================
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CL_Netchan_Process
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=================
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*/
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qboolean CL_Netchan_Process( netchan_t *chan, msg_t *msg ) {
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int ret;
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ret = Netchan_Process( chan, msg );
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if (!ret)
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return qfalse;
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#ifdef LEGACY_PROTOCOL
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if(chan->compat)
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CL_Netchan_Decode(msg);
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#endif
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return qtrue;
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}
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