ref: 0e7c1aeabdea199f705a09eb07139dabb0b47f54
dir: /src/i_net.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: i_net.c 52 2005-08-12 16:54:15Z fraggle $
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// $Log$
// Revision 1.5 2005/08/12 16:54:15 fraggle
// Port network code to use SDL_net
//
// Revision 1.4 2005/08/04 18:42:15 fraggle
// Silence compiler warnings
//
// Revision 1.3 2005/07/23 18:56:07 fraggle
// Remove unneccessary pragmas
//
// Revision 1.2 2005/07/23 16:44:55 fraggle
// Update copyright to GNU GPL
//
// Revision 1.1.1.1 2005/07/23 16:20:32 fraggle
// Initial import
//
//
// DESCRIPTION:
//
//-----------------------------------------------------------------------------
static const char
rcsid[] = "$Id: i_net.c 52 2005-08-12 16:54:15Z fraggle $";
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <SDL_net.h>
#include "i_system.h"
#include "d_event.h"
#include "d_net.h"
#include "m_argv.h"
#include "doomstat.h"
#include "i_net.h"
void NetSend (void);
boolean NetListen (void);
//
// NETWORKING
//
int DOOMPORT = 8626;
static UDPsocket udpsocket;
static UDPpacket *packet;
static IPaddress sendaddress[MAXNETNODES];
void (*netget) (void);
void (*netsend) (void);
unsigned short host_to_net16(unsigned int value)
{
union
{
unsigned short s;
char b[2];
} data;
SDLNet_Write16(value, data.b);
return data.s;
}
unsigned short net_to_host16(unsigned int value)
{
unsigned short s = value;
return SDLNet_Read16(&s);
}
unsigned long host_to_net32(unsigned int value)
{
union
{
unsigned long l;
char b[4];
} data;
SDLNet_Write32(value, data.b);
return data.l;
}
unsigned long net_to_host32(unsigned int value)
{
union
{
unsigned long l;
char b[4];
} data;
data.l = value;
return SDLNet_Read32(data.b);
}
//
// PacketSend
//
void PacketSend (void)
{
int c;
doomdata_t *sw;
sw = (doomdata_t *) packet->data;
// byte swap
sw->checksum = host_to_net32(netbuffer->checksum);
sw->player = netbuffer->player;
sw->retransmitfrom = netbuffer->retransmitfrom;
sw->starttic = netbuffer->starttic;
sw->numtics = netbuffer->numtics;
for (c=0 ; c< netbuffer->numtics ; c++)
{
sw->cmds[c].forwardmove = netbuffer->cmds[c].forwardmove;
sw->cmds[c].sidemove = netbuffer->cmds[c].sidemove;
sw->cmds[c].angleturn = host_to_net16(netbuffer->cmds[c].angleturn);
sw->cmds[c].consistancy = host_to_net16(netbuffer->cmds[c].consistancy);
sw->cmds[c].chatchar = netbuffer->cmds[c].chatchar;
sw->cmds[c].buttons = netbuffer->cmds[c].buttons;
}
packet->len = doomcom->datalength;
packet->address = sendaddress[doomcom->remotenode];
if (!SDLNet_UDP_Send(udpsocket, -1, packet))
{
I_Error("Error sending packet: %s", SDLNet_GetError());
}
}
//
// PacketGet
//
void PacketGet (void)
{
int i;
int c;
doomdata_t *sw;
int packets_read;
packets_read = SDLNet_UDP_Recv(udpsocket, packet);
if (packets_read < 0)
{
I_Error("Error reading packet: %s\n", SDLNet_GetError());
}
if (packets_read == 0)
{
doomcom->remotenode = -1;
return;
}
// find remote node number
for (i=0 ; i<doomcom->numnodes ; i++)
if (packet->address.host == sendaddress[i].host
&& packet->address.port == sendaddress[i].port)
break;
if (i == doomcom->numnodes)
{
// packet is not from one of the players (new game broadcast)
doomcom->remotenode = -1; // no packet
return;
}
doomcom->remotenode = i; // good packet from a game player
doomcom->datalength = packet->len;
sw = (doomdata_t *) packet->data;
// byte swap
netbuffer->checksum = net_to_host32(sw->checksum);
netbuffer->player = sw->player;
netbuffer->retransmitfrom = sw->retransmitfrom;
netbuffer->starttic = sw->starttic;
netbuffer->numtics = sw->numtics;
for (c=0 ; c< netbuffer->numtics ; c++)
{
netbuffer->cmds[c].forwardmove = sw->cmds[c].forwardmove;
netbuffer->cmds[c].sidemove = sw->cmds[c].sidemove;
netbuffer->cmds[c].angleturn = net_to_host16(sw->cmds[c].angleturn);
netbuffer->cmds[c].consistancy = net_to_host16(sw->cmds[c].consistancy);
netbuffer->cmds[c].chatchar = sw->cmds[c].chatchar;
netbuffer->cmds[c].buttons = sw->cmds[c].buttons;
}
}
//
// I_InitNetwork
//
void I_InitNetwork (void)
{
int i;
int p;
doomcom = malloc (sizeof (*doomcom) );
memset (doomcom, 0, sizeof(*doomcom) );
// set up for network
i = M_CheckParm ("-dup");
if (i && i< myargc-1)
{
doomcom->ticdup = myargv[i+1][0]-'0';
if (doomcom->ticdup < 1)
doomcom->ticdup = 1;
if (doomcom->ticdup > 9)
doomcom->ticdup = 9;
}
else
doomcom-> ticdup = 1;
if (M_CheckParm ("-extratic"))
doomcom-> extratics = 1;
else
doomcom-> extratics = 0;
p = M_CheckParm ("-port");
if (p && p<myargc-1)
{
DOOMPORT = atoi (myargv[p+1]);
printf ("using alternate port %i\n",DOOMPORT);
}
// parse network game options,
// -net <consoleplayer> <host> <host> ...
i = M_CheckParm ("-net");
if (!i)
{
// single player game
netgame = false;
doomcom->id = DOOMCOM_ID;
doomcom->numplayers = doomcom->numnodes = 1;
doomcom->deathmatch = false;
doomcom->consoleplayer = 0;
return;
}
netsend = PacketSend;
netget = PacketGet;
netgame = true;
// parse player number and host list
doomcom->consoleplayer = myargv[i+1][0]-'1';
doomcom->numnodes = 1; // this node for sure
SDLNet_Init();
i++;
while (++i < myargc && myargv[i][0] != '-')
{
if (SDLNet_ResolveHost(&sendaddress[doomcom->numnodes],
myargv[i], DOOMPORT))
{
I_Error("Unable to resolve %s", myargv[i]);
}
doomcom->numnodes++;
}
doomcom->id = DOOMCOM_ID;
doomcom->numplayers = doomcom->numnodes;
// build message to receive
udpsocket = SDLNet_UDP_Open(DOOMPORT);
packet = SDLNet_AllocPacket(5000);
}
void I_NetCmd (void)
{
if (doomcom->command == CMD_SEND)
{
netsend ();
}
else if (doomcom->command == CMD_GET)
{
netget ();
}
else
I_Error ("Bad net cmd: %i\n",doomcom->command);
}