mirror of https://git.code.sf.net/p/quake/newtree
395 lines
6.8 KiB
C
395 lines
6.8 KiB
C
/*
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msg.c
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(description)
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the 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 this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#include "msg.h"
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#include "net.h"
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#include "protocol.h"
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#include "qendian.h"
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#include "sys.h"
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/*
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==============================================================================
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MESSAGE IO FUNCTIONS
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Handles byte ordering and avoids alignment errors
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==============================================================================
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*/
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//
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// writing functions
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//
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void MSG_WriteChar (sizebuf_t *sb, int c)
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{
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byte *buf;
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#ifdef PARANOID
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if (c < -128 || c > 127)
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Sys_Error ("MSG_WriteChar: range error");
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#endif
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buf = SZ_GetSpace (sb, 1);
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buf[0] = c;
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}
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void MSG_WriteByte (sizebuf_t *sb, int c)
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{
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byte *buf;
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#ifdef PARANOID
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if (c < 0 || c > 255)
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Sys_Error ("MSG_WriteByte: range error");
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#endif
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buf = SZ_GetSpace (sb, 1);
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buf[0] = c;
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}
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void MSG_WriteShort (sizebuf_t *sb, int c)
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{
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byte *buf;
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#ifdef PARANOID
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if (c < ((short)0x8000) || c > (short)0x7fff)
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Sys_Error ("MSG_WriteShort: range error");
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#endif
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buf = SZ_GetSpace (sb, 2);
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buf[0] = c&0xff;
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buf[1] = c>>8;
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}
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void MSG_WriteLong (sizebuf_t *sb, int c)
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{
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byte *buf;
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buf = SZ_GetSpace (sb, 4);
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buf[0] = c&0xff;
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buf[1] = (c>>8)&0xff;
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buf[2] = (c>>16)&0xff;
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buf[3] = c>>24;
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}
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void MSG_WriteFloat (sizebuf_t *sb, float f)
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{
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union
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{
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float f;
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int l;
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} dat;
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dat.f = f;
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dat.l = LittleLong (dat.l);
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SZ_Write (sb, &dat.l, 4);
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}
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void MSG_WriteString (sizebuf_t *sb, char *s)
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{
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if (!s)
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SZ_Write (sb, "", 1);
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else
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SZ_Write (sb, s, strlen(s)+1);
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}
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void MSG_WriteCoord (sizebuf_t *sb, float f)
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{
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MSG_WriteShort (sb, (int)(f*8));
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}
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void MSG_WriteAngle (sizebuf_t *sb, float f)
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{
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MSG_WriteByte (sb, (int)(f*256/360) & 255);
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}
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void MSG_WriteAngle16 (sizebuf_t *sb, float f)
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{
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MSG_WriteShort (sb, (int)(f*65536/360) & 65535);
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}
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void MSG_WriteDeltaUsercmd (sizebuf_t *buf, usercmd_t *from, usercmd_t *cmd)
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{
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int bits;
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//
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// send the movement message
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//
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bits = 0;
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if (cmd->angles[0] != from->angles[0])
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bits |= CM_ANGLE1;
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if (cmd->angles[1] != from->angles[1])
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bits |= CM_ANGLE2;
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if (cmd->angles[2] != from->angles[2])
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bits |= CM_ANGLE3;
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if (cmd->forwardmove != from->forwardmove)
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bits |= CM_FORWARD;
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if (cmd->sidemove != from->sidemove)
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bits |= CM_SIDE;
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if (cmd->upmove != from->upmove)
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bits |= CM_UP;
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if (cmd->buttons != from->buttons)
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bits |= CM_BUTTONS;
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if (cmd->impulse != from->impulse)
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bits |= CM_IMPULSE;
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MSG_WriteByte (buf, bits);
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if (bits & CM_ANGLE1)
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MSG_WriteAngle16 (buf, cmd->angles[0]);
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if (bits & CM_ANGLE2)
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MSG_WriteAngle16 (buf, cmd->angles[1]);
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if (bits & CM_ANGLE3)
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MSG_WriteAngle16 (buf, cmd->angles[2]);
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if (bits & CM_FORWARD)
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MSG_WriteShort (buf, cmd->forwardmove);
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if (bits & CM_SIDE)
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MSG_WriteShort (buf, cmd->sidemove);
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if (bits & CM_UP)
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MSG_WriteShort (buf, cmd->upmove);
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if (bits & CM_BUTTONS)
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MSG_WriteByte (buf, cmd->buttons);
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if (bits & CM_IMPULSE)
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MSG_WriteByte (buf, cmd->impulse);
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MSG_WriteByte (buf, cmd->msec);
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}
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//
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// reading functions
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//
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int msg_readcount;
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qboolean msg_badread;
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void MSG_BeginReading (void)
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{
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msg_readcount = 0;
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msg_badread = false;
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}
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int MSG_GetReadCount(void)
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{
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return msg_readcount;
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}
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// returns -1 and sets msg_badread if no more characters are available
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int MSG_ReadChar (void)
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{
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int c;
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if (msg_readcount+1 > net_message.cursize)
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{
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msg_badread = true;
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return -1;
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}
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c = (signed char)net_message.data[msg_readcount];
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msg_readcount++;
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return c;
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}
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int MSG_ReadByte (void)
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{
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int c;
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if (msg_readcount+1 > net_message.cursize)
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{
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msg_badread = true;
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return -1;
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}
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c = (unsigned char)net_message.data[msg_readcount];
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msg_readcount++;
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return c;
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}
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int MSG_ReadShort (void)
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{
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int c;
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if (msg_readcount+2 > net_message.cursize)
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{
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msg_badread = true;
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return -1;
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}
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c = (short)(net_message.data[msg_readcount]
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+ (net_message.data[msg_readcount+1]<<8));
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msg_readcount += 2;
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return c;
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}
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int MSG_ReadLong (void)
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{
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int c;
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if (msg_readcount+4 > net_message.cursize)
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{
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msg_badread = true;
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return -1;
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}
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c = net_message.data[msg_readcount]
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+ (net_message.data[msg_readcount+1]<<8)
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+ (net_message.data[msg_readcount+2]<<16)
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+ (net_message.data[msg_readcount+3]<<24);
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msg_readcount += 4;
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return c;
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}
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float MSG_ReadFloat (void)
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{
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union
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{
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byte b[4];
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float f;
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int l;
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} dat;
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dat.b[0] = net_message.data[msg_readcount];
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dat.b[1] = net_message.data[msg_readcount+1];
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dat.b[2] = net_message.data[msg_readcount+2];
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dat.b[3] = net_message.data[msg_readcount+3];
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msg_readcount += 4;
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dat.l = LittleLong (dat.l);
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return dat.f;
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}
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char *MSG_ReadString (void)
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{
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static char string[2048];
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int l,c;
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l = 0;
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do
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{
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c = MSG_ReadChar ();
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if (c == -1 || c == 0)
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break;
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string[l] = c;
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l++;
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} while (l < sizeof(string)-1);
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string[l] = 0;
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return string;
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}
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char *MSG_ReadStringLine (void)
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{
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static char string[2048];
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int l,c;
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l = 0;
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do
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{
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c = MSG_ReadChar ();
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if (c == -1 || c == 0 || c == '\n')
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break;
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string[l] = c;
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l++;
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} while (l < sizeof(string)-1);
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string[l] = 0;
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return string;
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}
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float MSG_ReadCoord (void)
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{
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return MSG_ReadShort() * (1.0/8);
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}
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float MSG_ReadAngle (void)
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{
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return MSG_ReadChar() * (360.0/256);
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}
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float MSG_ReadAngle16 (void)
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{
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return MSG_ReadShort() * (360.0/65536);
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}
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void MSG_ReadDeltaUsercmd (usercmd_t *from, usercmd_t *move)
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{
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int bits;
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memcpy (move, from, sizeof(*move));
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bits = MSG_ReadByte ();
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// read current angles
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if (bits & CM_ANGLE1)
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move->angles[0] = MSG_ReadAngle16 ();
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if (bits & CM_ANGLE2)
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move->angles[1] = MSG_ReadAngle16 ();
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if (bits & CM_ANGLE3)
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move->angles[2] = MSG_ReadAngle16 ();
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// read movement
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if (bits & CM_FORWARD)
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move->forwardmove = MSG_ReadShort ();
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if (bits & CM_SIDE)
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move->sidemove = MSG_ReadShort ();
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if (bits & CM_UP)
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move->upmove = MSG_ReadShort ();
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// read buttons
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if (bits & CM_BUTTONS)
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move->buttons = MSG_ReadByte ();
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if (bits & CM_IMPULSE)
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move->impulse = MSG_ReadByte ();
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// read time to run command
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move->msec = MSG_ReadByte ();
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}
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