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  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 (Q_strcmp(hostname.string, "UNNAMED") == 0)
  54.                 Q_strcpy(hostcache[0].name, "local");
  55.         else
  56.                 Q_strcpy(hostcache[0].name, hostname.string);
  57.         Q_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.         Q_strcpy(hostcache[0].cname, "local");
  62. }
  63.  
  64.  
  65. qsocket_t *Loop_Connect (char *host)
  66. {
  67.         if (Q_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.                 Q_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.                 Q_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.                 Q_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.         byte *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.                 Sys_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.         Q_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.         byte *buffer;
  191.         int  *bufferLength;
  192.  
  193.         if (!sock->driverdata)
  194.                 return -1;
  195.  
  196.         bufferLength = &((qsocket_t *)sock->driverdata)->receiveMessageLength;
  197.  
  198.         if ((*bufferLength + data->cursize + sizeof(byte) + sizeof(short)) > NET_MAXMESSAGE)
  199.                 return 0;
  200.  
  201.         buffer = ((qsocket_t *)sock->driverdata)->receiveMessage + *bufferLength;
  202.  
  203.         // message type
  204.         *buffer++ = 2;
  205.  
  206.         // length
  207.         *buffer++ = data->cursize & 0xff;
  208.         *buffer++ = data->cursize >> 8;
  209.  
  210.         // align
  211.         buffer++;
  212.  
  213.         // message
  214.         Q_memcpy(buffer, data->data, data->cursize);
  215.         *bufferLength = IntAlign(*bufferLength + data->cursize + 4);
  216.         return 1;
  217. }
  218.  
  219.  
  220. qboolean Loop_CanSendMessage (qsocket_t *sock)
  221. {
  222.         if (!sock->driverdata)
  223.                 return false;
  224.         return sock->canSend;
  225. }
  226.  
  227.  
  228. qboolean Loop_CanSendUnreliableMessage (qsocket_t *sock)
  229. {
  230.         return true;
  231. }
  232.  
  233.  
  234. void Loop_Close (qsocket_t *sock)
  235. {
  236.         if (sock->driverdata)
  237.                 ((qsocket_t *)sock->driverdata)->driverdata = NULL;
  238.         sock->receiveMessageLength = 0;
  239.         sock->sendMessageLength = 0;
  240.         sock->canSend = true;
  241.         if (sock == loop_client)
  242.                 loop_client = NULL;
  243.         else
  244.                 loop_server = NULL;
  245. }
  246.