net_loop.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // net_loop.c
  21
  22 #include "quakedef.h"
  23 #include "net_loop.h"
  24
  25 qboolean        localconnectpending = false;
  26 qsocket_t       *loop_client = NULL;
  27 qsocket_t       *loop_server = NULL;
  28
  29 int Loop_Init (void)
  30 {
  31         if (cls.state == ca_dedicated)
  32                 return -1;
  33         return 0;
  34 }
  35
  36
  37 void Loop_Shutdown (void)
  38 {
  39 }
  40
  41
  42 void Loop_Listen (qboolean state)
  43 {
  44 }
  45
  46
  47 void Loop_SearchForHosts (qboolean xmit)
  48 {
  49         if (!sv.active)
  50                 return;
  51
  52         hostCacheCount = 1;
  53         if (strcmp(hostname.string, "UNNAMED") == 0)
  54                 strcpy(hostcache[0].name, "local");
  55         else
  56                 strcpy(hostcache[0].name, hostname.string);
  57         strcpy(hostcache[0].map, sv.name);
  58         hostcache[0].users = net_activeconnections;
  59         hostcache[0].maxusers = svs.maxclients;
  60         hostcache[0].driver = net_driverlevel;
  61         strcpy(hostcache[0].cname, "local");
  62 }
  63
  64
  65 qsocket_t *Loop_Connect (char *host)
  66 {
  67         if (strcmp(host,"local") != 0)
  68                 return NULL;
  69
  70         localconnectpending = true;
  71
  72         if (!loop_client)
  73         {
  74                 if ((loop_client = NET_NewQSocket ()) == NULL)
  75                 {
  76                         Con_Printf("Loop_Connect: no qsocket available\n");
  77                         return NULL;
  78                 }
  79                 strcpy (loop_client->address, "localhost");
  80         }
  81         loop_client->receiveMessageLength = 0;
  82         loop_client->sendMessageLength = 0;
  83         loop_client->canSend = true;
  84
  85         if (!loop_server)
  86         {
  87                 if ((loop_server = NET_NewQSocket ()) == NULL)
  88                 {
  89                         Con_Printf("Loop_Connect: no qsocket available\n");
  90                         return NULL;
  91                 }
  92                 strcpy (loop_server->address, "LOCAL");
  93         }
  94         loop_server->receiveMessageLength = 0;
  95         loop_server->sendMessageLength = 0;
  96         loop_server->canSend = true;
  97
  98         loop_client->driverdata = (void *)loop_server;
  99         loop_server->driverdata = (void *)loop_client;
 100
 101         return loop_client;
 102 }
 103
 104
 105 qsocket_t *Loop_CheckNewConnections (void)
 106 {
 107         if (!localconnectpending)
 108                 return NULL;
 109
 110         localconnectpending = false;
 111         loop_server->sendMessageLength = 0;
 112         loop_server->receiveMessageLength = 0;
 113         loop_server->canSend = true;
 114         loop_client->sendMessageLength = 0;
 115         loop_client->receiveMessageLength = 0;
 116         loop_client->canSend = true;
 117         return loop_server;
 118 }
 119
 120
 121 static int IntAlign(int value)
 122 {
 123         return (value + (sizeof(int) - 1)) & (~(sizeof(int) - 1));
 124 }
 125
 126
 127 int Loop_GetMessage (qsocket_t *sock)
 128 {
 129         int             ret;
 130         int             length;
 131
 132         if (sock->receiveMessageLength == 0)
 133                 return 0;
 134
 135         ret = sock->receiveMessage[0];
 136         length = sock->receiveMessage[1] + (sock->receiveMessage[2] << 8);
 137         // alignment byte skipped here
 138         SZ_Clear (&net_message);
 139         SZ_Write (&net_message, &sock->receiveMessage[4], length);
 140
 141         length = IntAlign(length + 4);
 142         sock->receiveMessageLength -= length;
 143
 144         if (sock->receiveMessageLength)
 145                 memcpy(sock->receiveMessage, &sock->receiveMessage[length], sock->receiveMessageLength);
 146
 147         if (sock->driverdata && ret == 1)
 148                 ((qsocket_t *)sock->driverdata)->canSend = true;
 149
 150         return ret;
 151 }
 152
 153
 154 int Loop_SendMessage (qsocket_t *sock, sizebuf_t *data)
 155 {
 156         qbyte *buffer;
 157         int *bufferLength;
 158
 159         if (!sock->driverdata)
 160                 return -1;
 161
 162         bufferLength = &((qsocket_t *)sock->driverdata)->receiveMessageLength;
 163
 164         if ((*bufferLength + data->cursize + 4) > NET_MAXMESSAGE)
 165                 Host_Error("Loop_SendMessage: overflow\n");
 166
 167         buffer = ((qsocket_t *)sock->driverdata)->receiveMessage + *bufferLength;
 168
 169         // message type
 170         *buffer++ = 1;
 171
 172         // length
 173         *buffer++ = data->cursize & 0xff;
 174         *buffer++ = data->cursize >> 8;
 175
 176         // align
 177         buffer++;
 178
 179         // message
 180         memcpy(buffer, data->data, data->cursize);
 181         *bufferLength = IntAlign(*bufferLength + data->cursize + 4);
 182
 183         sock->canSend = false;
 184         return 1;
 185 }
 186
 187
 188 int Loop_SendUnreliableMessage (qsocket_t *sock, sizebuf_t *data)
 189 {
 190         qbyte *buffer;
 191         int *bufferLength;
 192
 193         if (!sock->driverdata)
 194                 return -1;
 195
 196         bufferLength = &((qsocket_t *)sock->driverdata)->receiveMessageLength;
 197
 198         // LordHavoc: added an extra sizeof(qbyte) to account for alignment
 199         if ((*bufferLength + data->cursize + sizeof(qbyte) + sizeof(short) + sizeof(qbyte)) > NET_MAXMESSAGE)
 200                 return 0;
 201
 202         buffer = ((qsocket_t *)sock->driverdata)->receiveMessage + *bufferLength;
 203
 204         // message type
 205         *buffer++ = 2;
 206
 207         // length
 208         *buffer++ = data->cursize & 0xff;
 209         *buffer++ = data->cursize >> 8;
 210
 211         // align
 212         buffer++;
 213
 214         // message
 215         memcpy(buffer, data->data, data->cursize);
 216         *bufferLength = IntAlign(*bufferLength + data->cursize + 4);
 217         return 1;
 218 }
 219
 220
 221 qboolean Loop_CanSendMessage (qsocket_t *sock)
 222 {
 223         if (!sock->driverdata)
 224                 return false;
 225         return sock->canSend;
 226 }
 227
 228
 229 qboolean Loop_CanSendUnreliableMessage (qsocket_t *sock)
 230 {
 231         return true;
 232 }
 233
 234
 235 void Loop_Close (qsocket_t *sock)
 236 {
 237         if (sock->driverdata)
 238                 ((qsocket_t *)sock->driverdata)->driverdata = NULL;
 239         sock->receiveMessageLength = 0;
 240         sock->sendMessageLength = 0;
 241         sock->canSend = true;
 242         if (sock == loop_client)
 243                 loop_client = NULL;
 244         else
 245                 loop_server = NULL;
 246 }