mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-24 05:11:42 +00:00
341 lines
6.2 KiB
C
341 lines
6.2 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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*/
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static const char rcsid[] =
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"$Id$";
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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 "QF/msg.h"
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#include "QF/qendian.h"
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#include "QF/sys.h"
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#include "compat.h"
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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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// writing functions
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void
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MSG_WriteChar (sizebuf_t *sb, unsigned int c)
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{
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byte *buf;
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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
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MSG_WriteByte (sizebuf_t *sb, unsigned int c)
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{
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byte *buf;
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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
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MSG_WriteShort (sizebuf_t *sb, unsigned int c)
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{
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byte *buf;
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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
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MSG_WriteLong (sizebuf_t *sb, unsigned 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
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MSG_WriteFloat (sizebuf_t *sb, float f)
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{
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union {
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float f;
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unsigned 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
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MSG_WriteString (sizebuf_t *sb, const 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
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MSG_WriteCoord (sizebuf_t *sb, float coord)
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{
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MSG_WriteShort (sb, (unsigned int) (coord * 8.0));
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}
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void
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MSG_WriteCoordV (sizebuf_t *sb, const vec3_t coord)
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{
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int i;
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for (i = 0; i < 3; i++)
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MSG_WriteShort (sb, (unsigned int) (coord[i] * 8.0));
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}
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void
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MSG_WriteCoordAngleV (sizebuf_t *sb, const vec3_t coord, const vec3_t angles)
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{
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int i;
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for (i = 0; i < 3; i++) {
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MSG_WriteShort (sb, (unsigned int) (coord[i] * 8.0));
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MSG_WriteByte (sb, (unsigned int) (angles[i] * 256 / 360) & 255);
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}
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}
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void
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MSG_WriteAngle (sizebuf_t *sb, float angle)
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{
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MSG_WriteByte (sb, (unsigned int) (angle * 256 / 360) & 255);
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}
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void
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MSG_WriteAngleV (sizebuf_t *sb, const vec3_t angles)
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{
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int i;
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for (i = 0; i < 3; i++)
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MSG_WriteByte (sb, (unsigned int) (angles[i] * 256 / 360) & 255);
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}
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void
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MSG_WriteAngle16 (sizebuf_t *sb, float angle16)
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{
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MSG_WriteShort (sb, (unsigned int) (angle16 * 65536 / 360) & 65535);
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}
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// reading functions
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void
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MSG_BeginReading (msg_t *msg)
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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
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MSG_GetReadCount (msg_t *msg)
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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
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MSG_ReadChar (msg_t *msg)
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{
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if (msg->readcount + 1 <= msg->message->cursize)
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return (signed char) msg->message->data[msg->readcount++];
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msg->badread = true;
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return -1;
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}
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int
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MSG_ReadByte (msg_t *msg)
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{
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if (msg->readcount + 1 <= msg->message->cursize)
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return (unsigned char) msg->message->data[msg->readcount++];
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msg->badread = true;
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return -1;
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}
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int
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MSG_ReadShort (msg_t *msg)
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{
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int c;
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if (msg->readcount + 2 <= msg->message->cursize) {
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c = (short) (msg->message->data[msg->readcount]
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+ (msg->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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msg->readcount = msg->message->cursize;
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msg->badread = true;
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return -1;
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}
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int
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MSG_ReadLong (msg_t *msg)
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{
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int c;
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if (msg->readcount + 4 <= msg->message->cursize) {
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c = msg->message->data[msg->readcount]
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+ (msg->message->data[msg->readcount + 1] << 8)
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+ (msg->message->data[msg->readcount + 2] << 16)
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+ (msg->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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msg->readcount = msg->message->cursize;
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msg->badread = true;
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return -1;
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}
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float
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MSG_ReadFloat (msg_t *msg)
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{
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union {
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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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if (msg->readcount + 4 <= msg->message->cursize) {
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dat.b[0] = msg->message->data[msg->readcount];
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dat.b[1] = msg->message->data[msg->readcount + 1];
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dat.b[2] = msg->message->data[msg->readcount + 2];
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dat.b[3] = msg->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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msg->readcount = msg->message->cursize;
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msg->badread = true;
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return -1;
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}
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const char *
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MSG_ReadString (msg_t *msg)
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{
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char *string;
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int len, maxlen;
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if (msg->badread || msg->readcount + 1 > msg->message->cursize) {
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msg->badread = true;
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return "";
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}
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string = &msg->message->data[msg->readcount];
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maxlen = msg->message->cursize - msg->readcount;
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len = strnlen (string, maxlen);
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if (len == maxlen) {
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msg->readcount = msg->readcount;
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msg->badread = true;
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if (len + 1 > msg->badread_string_size) {
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if (msg->badread_string)
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free (msg->badread_string);
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msg->badread_string = malloc (len + 1);
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msg->badread_string_size = len + 1;
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}
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if (!msg->badread_string)
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Sys_Error ("MSG_ReadString: out of memory");
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strncpy (msg->badread_string, string, len);
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msg->badread_string[len] = 0;
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return msg->badread_string;
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}
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msg->readcount += len + 1;
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return string;
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}
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float
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MSG_ReadCoord (msg_t *msg)
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{
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return MSG_ReadShort (msg) * (1.0 / 8.0);
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}
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void
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MSG_ReadCoordV (msg_t *msg, vec3_t coord)
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{
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int i;
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for (i = 0; i < 3; i++)
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coord[i] = MSG_ReadShort (msg) * (1.0 / 8.0);
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}
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void
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MSG_ReadCoordAngleV (msg_t *msg, vec3_t coord, vec3_t angles)
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{
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int i;
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for (i = 0; i < 3; i++) {
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coord[i] = MSG_ReadShort (msg) * (1.0 / 8.0);
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angles[i] = MSG_ReadChar (msg) * (360.0 / 256.0);
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}
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}
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float
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MSG_ReadAngle (msg_t *msg)
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{
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return MSG_ReadChar (msg) * (360.0 / 256.0);
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}
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void
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MSG_ReadAngleV (msg_t *msg, vec3_t angles)
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{
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int i;
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for (i = 0; i < 3; i++)
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angles[i] = MSG_ReadChar (msg) * (360.0 / 256.0);
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}
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float
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MSG_ReadAngle16 (msg_t *msg)
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{
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return MSG_ReadShort (msg) * (360.0 / 65536.0);
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}
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