mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-10 23:32:09 +00:00
466 lines
9.4 KiB
C
466 lines
9.4 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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#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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VISIBLE void
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MSG_WriteByte (sizebuf_t *sb, 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 = c;
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}
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VISIBLE void
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MSG_WriteShort (sizebuf_t *sb, 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++ = ((unsigned int) c) & 0xff;
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*buf = ((unsigned int) c) >> 8;
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}
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VISIBLE void
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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++ = ((unsigned int) c) & 0xff;
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*buf++ = (((unsigned int) c) >> 8) & 0xff;
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*buf++ = (((unsigned int) c) >> 16) & 0xff;
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*buf = ((unsigned int) c) >> 24;
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}
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VISIBLE 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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VISIBLE 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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VISIBLE void
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MSG_WriteBytes (sizebuf_t *sb, const void *buf, int len)
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{
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SZ_Write (sb, buf, len);
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}
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VISIBLE void
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MSG_WriteCoord (sizebuf_t *sb, float coord)
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{
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MSG_WriteShort (sb, (int) (coord * 8.0));
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}
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VISIBLE void
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MSG_WriteCoordV (sizebuf_t *sb, const vec3_t coord)
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{
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byte *buf;
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unsigned int i, j;
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buf = SZ_GetSpace (sb, 6);
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for (i = 0; i < 3; i++) {
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j = (int) (coord[i] * 8.0);
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*buf++ = j & 0xff;
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*buf++ = j >> 8;
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}
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}
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VISIBLE 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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byte *buf;
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int i, j;
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buf = SZ_GetSpace (sb, 9);
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for (i = 0; i < 3; i++) {
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j = (int) (coord[i] * 8.0);
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*buf++ = j & 0xff;
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*buf++ = j >> 8;
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*buf++ = ((int) (angles[i] * (256.0 / 360.0)) & 255);
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}
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}
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VISIBLE void
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MSG_WriteAngle (sizebuf_t *sb, float angle)
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{
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MSG_WriteByte (sb, (int) (angle * (256.0 / 360.0)) & 255);
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}
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VISIBLE void
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MSG_WriteAngleV (sizebuf_t *sb, const vec3_t angles)
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{
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byte *buf;
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int i;
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buf = SZ_GetSpace (sb, 3);
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for (i = 0; i < 3; i++) {
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*buf++ = ((int) (angles[i] * (256.0 / 360.0)) & 255);
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}
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}
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VISIBLE void
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MSG_WriteAngle16 (sizebuf_t *sb, float angle)
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{
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MSG_WriteShort (sb, (int) (angle * (65536.0 / 360.0)) & 65535);
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}
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VISIBLE void
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MSG_WriteAngle16V (sizebuf_t *sb, const vec3_t angles)
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{
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byte *buf;
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int i;
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unsigned short ang;
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buf = SZ_GetSpace (sb, 6);
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for (i = 0; i < 3; i++) {
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ang = (int) (angles[i] * (65536.0 / 360.0)) & 65535;
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*buf++ = ang & 0xff;
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*buf++ = ang >> 8;
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}
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}
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VISIBLE void
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MSG_WriteUTF8 (sizebuf_t *sb, unsigned utf8)
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{
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byte *buf;
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int count;
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if (utf8 & 0x80000000) {
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return; // invalid (FIXME die?)
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} else if (utf8 & 0x7c000000) {
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buf = SZ_GetSpace (sb, count = 6);
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*buf = 0xfc | ((utf8 & 0x40000000) >> 30); // 1 bit
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utf8 <<= 2;
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} else if (utf8 & 0x03e00000) {
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buf = SZ_GetSpace (sb, count = 5);
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*buf = 0xf8 | ((utf8 & 0x30000000) >> 28); // 2 bits
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utf8 <<= 4;
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} else if (utf8 & 0x001f0000) {
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buf = SZ_GetSpace (sb, count = 4);
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*buf = 0xf0 | ((utf8 & 0x001c0000) >> 18); // 3 bits
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utf8 <<= 14;
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} else if (utf8 & 0x0000f800) {
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buf = SZ_GetSpace (sb, count = 3);
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*buf = 0xe0 | ((utf8 & 0x0000f000) >> 12); // 4 bits
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utf8 <<= 20;
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} else if (utf8 & 0x00000780) {
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buf = SZ_GetSpace (sb, count = 2);
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*buf = 0xc0 | ((utf8 & 0x00000780) >> 7); // 5 bits
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utf8 <<= 25;
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} else {
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buf = SZ_GetSpace (sb, count = 1);
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*buf = utf8;
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return;
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}
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while (--count) {
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*buf++ = 0x80 | ((utf8 & 0xfc000000) >> 26);
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utf8 <<= 6;
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}
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}
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// reading functions ==========================================================
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VISIBLE void
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MSG_BeginReading (qmsg_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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VISIBLE int
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MSG_GetReadCount (qmsg_t *msg)
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{
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return msg->readcount;
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}
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VISIBLE int
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MSG_ReadByte (qmsg_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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VISIBLE int
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MSG_ReadShort (qmsg_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 = (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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VISIBLE int
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MSG_ReadLong (qmsg_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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VISIBLE float
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MSG_ReadFloat (qmsg_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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VISIBLE const char *
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MSG_ReadString (qmsg_t *msg)
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{
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char *string;
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size_t 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 = (char *) &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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VISIBLE int
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MSG_ReadBytes (qmsg_t *msg, void *buf, int len)
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{
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if (msg->badread || len > msg->message->cursize - msg->readcount) {
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msg->badread = true;
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len = msg->message->cursize - msg->readcount;
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}
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memcpy (buf, msg->message->data + msg->readcount, len);
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msg->readcount += len;
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return len;
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}
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VISIBLE float
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MSG_ReadCoord (qmsg_t *msg)
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{
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return (short) MSG_ReadShort (msg) * (1.0 / 8.0);
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}
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VISIBLE void
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MSG_ReadCoordV (qmsg_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] = (short) MSG_ReadShort (msg) * (1.0 / 8.0);
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}
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VISIBLE void
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MSG_ReadCoordAngleV (qmsg_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] = (short) MSG_ReadShort (msg) * (1.0 / 8.0);
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angles[i] = ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
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}
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}
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VISIBLE float
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MSG_ReadAngle (qmsg_t *msg)
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{
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return ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
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}
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VISIBLE void
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MSG_ReadAngleV (qmsg_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] = ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
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}
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VISIBLE float
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MSG_ReadAngle16 (qmsg_t *msg)
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{
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return (short) MSG_ReadShort (msg) * (360.0 / 65536.0);
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}
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VISIBLE void
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MSG_ReadAngle16V (qmsg_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] = (short) MSG_ReadShort (msg) * (360.0 / 65536.0);
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}
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VISIBLE int
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MSG_ReadUTF8 (qmsg_t *msg)
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{
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byte *buf, *start, c;
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int val = 0, count;
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if (msg->badread || msg->message->cursize == msg->readcount) {
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msg->badread = true;
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return -1;
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}
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buf = start = msg->message->data + msg->readcount;
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c = *buf++;
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if (c < 0x80) { // 0x00 - 0x7f 1,7,7
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val = c;
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count = 1;
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} else if (c < 0xc0) { // 0x80 - 0xbf not a valid first byte
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msg->badread = true;
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return -1;
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} else if (c < 0xe0) { // 0xc0 - 0xdf 2,5,11
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count = 2;
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val = c & 0x1f;
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} else if (c < 0xf0) { // 0xe0 - 0xef 3,4,16
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count = 3;
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val = c & 0x0f;
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} else if (c < 0xf8) { // 0xf0 - 0xf7 4,3,21
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count = 4;
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val = c & 0x07;
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} else if (c < 0xfc) { // 0xf8 - 0xfb 5,2,26
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count = 5;
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val = c & 0x03;
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} else if (c < 0xfe) { // 0xfc - 0xfd 6,1,31
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count = 6;
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val = c & 0x01;
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} else { // 0xfe - 0xff never valid
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msg->badread = true;
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return -1;
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}
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if (count > (msg->message->cursize - msg->readcount)) {
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msg->badread = true;
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return -1;
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}
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while (--count) {
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c = *buf++;
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if ((c & 0xc0) != 0x80) {
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msg->badread = true;
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return -1;
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}
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val <<= 6;
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val |= c & 0x3f;
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}
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msg->readcount += buf - start;
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return val;
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}
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