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quakeforge/libs/util/msg.c

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/*
msg.c
(description)
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/msg.h"
#include "QF/qendian.h"
#include "QF/sys.h"
#include "compat.h"
/*
MESSAGE IO FUNCTIONS
Handles byte ordering and avoids alignment errors
*/
// writing functions ==========================================================
VISIBLE void
MSG_WriteByte (sizebuf_t *sb, int c)
{
byte *buf;
buf = SZ_GetSpace (sb, 1);
*buf = c;
}
VISIBLE void
MSG_WriteShort (sizebuf_t *sb, int c)
{
byte *buf;
buf = SZ_GetSpace (sb, 2);
*buf++ = ((unsigned int) c) & 0xff;
*buf = ((unsigned int) c) >> 8;
}
VISIBLE void
MSG_WriteLong (sizebuf_t *sb, int c)
{
byte *buf;
buf = SZ_GetSpace (sb, 4);
*buf++ = ((unsigned int) c) & 0xff;
*buf++ = (((unsigned int) c) >> 8) & 0xff;
*buf++ = (((unsigned int) c) >> 16) & 0xff;
*buf = ((unsigned int) c) >> 24;
}
VISIBLE void
MSG_WriteFloat (sizebuf_t *sb, float f)
{
union {
float f;
unsigned int l;
} dat;
dat.f = f;
dat.l = LittleLong (dat.l);
SZ_Write (sb, &dat.l, 4);
}
VISIBLE void
MSG_WriteString (sizebuf_t *sb, const char *s)
{
if (!s)
SZ_Write (sb, "", 1);
else
SZ_Write (sb, s, strlen (s) + 1);
}
VISIBLE void
MSG_WriteCoord (sizebuf_t *sb, float coord)
{
MSG_WriteShort (sb, (int) (coord * 8.0));
}
VISIBLE void
MSG_WriteCoordV (sizebuf_t *sb, const vec3_t coord)
{
byte *buf;
unsigned int i, j;
buf = SZ_GetSpace (sb, 6);
for (i = 0; i < 3; i++) {
j = (int) (coord[i] * 8.0);
*buf++ = j & 0xff;
*buf++ = j >> 8;
}
}
VISIBLE void
MSG_WriteCoordAngleV (sizebuf_t *sb, const vec3_t coord, const vec3_t angles)
{
byte *buf;
int i, j;
buf = SZ_GetSpace (sb, 9);
for (i = 0; i < 3; i++) {
j = (int) (coord[i] * 8.0);
*buf++ = j & 0xff;
*buf++ = j >> 8;
*buf++ = ((int) (angles[i] * (256.0 / 360.0)) & 255);
}
}
VISIBLE void
MSG_WriteAngle (sizebuf_t *sb, float angle)
{
MSG_WriteByte (sb, (int) (angle * (256.0 / 360.0)) & 255);
}
VISIBLE void
MSG_WriteAngleV (sizebuf_t *sb, const vec3_t angles)
{
byte *buf;
int i;
buf = SZ_GetSpace (sb, 3);
for (i = 0; i < 3; i++) {
*buf++ = ((int) (angles[i] * (256.0 / 360.0)) & 255);
}
}
VISIBLE void
MSG_WriteAngle16 (sizebuf_t *sb, float angle)
{
MSG_WriteShort (sb, (int) (angle * (65536.0 / 360.0)) & 65535);
}
VISIBLE void
MSG_WriteAngle16V (sizebuf_t *sb, const vec3_t angles)
{
byte *buf;
int i;
unsigned short ang;
buf = SZ_GetSpace (sb, 6);
for (i = 0; i < 3; i++) {
ang = (int) (angles[i] * (65536.0 / 360.0)) & 65535;
*buf++ = ang & 0xff;
*buf++ = ang >> 8;
}
}
VISIBLE void
MSG_WriteUTF8 (sizebuf_t *sb, unsigned utf8)
{
byte *buf;
int count;
if (utf8 & 0x80000000) {
return; // invalid (FIXME die?)
} else if (utf8 & 0x7c000000) {
buf = SZ_GetSpace (sb, count = 6);
*buf = 0xfc | ((utf8 & 0x40000000) >> 30); // 1 bit
utf8 <<= 2;
} else if (utf8 & 0x03e00000) {
buf = SZ_GetSpace (sb, count = 5);
*buf = 0xf8 | ((utf8 & 0x30000000) >> 28); // 2 bits
utf8 <<= 4;
} else if (utf8 & 0x001f0000) {
buf = SZ_GetSpace (sb, count = 4);
*buf = 0xf0 | ((utf8 & 0x001c0000) >> 18); // 3 bits
utf8 <<= 14;
} else if (utf8 & 0x0000f800) {
buf = SZ_GetSpace (sb, count = 3);
*buf = 0xe0 | ((utf8 & 0x0000f000) >> 12); // 4 bits
utf8 <<= 20;
} else if (utf8 & 0x00000780) {
buf = SZ_GetSpace (sb, count = 2);
*buf = 0xc0 | ((utf8 & 0x00000780) >> 7); // 5 bits
utf8 <<= 25;
} else {
buf = SZ_GetSpace (sb, count = 1);
*buf = utf8;
return;
}
while (--count) {
*buf++ = 0x80 | ((utf8 & 0xfc000000) >> 26);
utf8 <<= 6;
}
}
// reading functions ==========================================================
VISIBLE void
MSG_BeginReading (qmsg_t *msg)
{
msg->readcount = 0;
msg->badread = false;
}
VISIBLE int
MSG_GetReadCount (qmsg_t *msg)
{
return msg->readcount;
}
VISIBLE int
MSG_ReadByte (qmsg_t *msg)
{
if (msg->readcount + 1 <= msg->message->cursize)
return (unsigned char) msg->message->data[msg->readcount++];
msg->badread = true;
return -1;
}
VISIBLE int
MSG_ReadShort (qmsg_t *msg)
{
int c;
if (msg->readcount + 2 <= msg->message->cursize) {
c = (msg->message->data[msg->readcount]
+ (msg->message->data[msg->readcount + 1] << 8));
msg->readcount += 2;
return c;
}
msg->readcount = msg->message->cursize;
msg->badread = true;
return -1;
}
VISIBLE int
MSG_ReadLong (qmsg_t *msg)
{
int c;
if (msg->readcount + 4 <= msg->message->cursize) {
c = msg->message->data[msg->readcount]
+ (msg->message->data[msg->readcount + 1] << 8)
+ (msg->message->data[msg->readcount + 2] << 16)
+ (msg->message->data[msg->readcount + 3] << 24);
msg->readcount += 4;
return c;
}
msg->readcount = msg->message->cursize;
msg->badread = true;
return -1;
}
VISIBLE float
MSG_ReadFloat (qmsg_t *msg)
{
union {
byte b[4];
float f;
int l;
} dat;
if (msg->readcount + 4 <= msg->message->cursize) {
dat.b[0] = msg->message->data[msg->readcount];
dat.b[1] = msg->message->data[msg->readcount + 1];
dat.b[2] = msg->message->data[msg->readcount + 2];
dat.b[3] = msg->message->data[msg->readcount + 3];
msg->readcount += 4;
dat.l = LittleLong (dat.l);
return dat.f;
}
msg->readcount = msg->message->cursize;
msg->badread = true;
return -1;
}
VISIBLE const char *
MSG_ReadString (qmsg_t *msg)
{
char *string;
size_t len, maxlen;
if (msg->badread || msg->readcount + 1 > msg->message->cursize) {
msg->badread = true;
return "";
}
string = (char *) &msg->message->data[msg->readcount];
maxlen = msg->message->cursize - msg->readcount;
len = strnlen (string, maxlen);
if (len == maxlen) {
msg->readcount = msg->readcount;
msg->badread = true;
if (len + 1 > msg->badread_string_size) {
if (msg->badread_string)
free (msg->badread_string);
msg->badread_string = malloc (len + 1);
msg->badread_string_size = len + 1;
}
if (!msg->badread_string)
Sys_Error ("MSG_ReadString: out of memory");
strncpy (msg->badread_string, string, len);
msg->badread_string[len] = 0;
return msg->badread_string;
}
msg->readcount += len + 1;
return string;
}
VISIBLE int
MSG_ReadBytes (qmsg_t *msg, void *buf, int len)
{
if (msg->badread || len > msg->message->cursize - msg->readcount) {
msg->badread = true;
len = msg->message->cursize - msg->readcount;
}
memcpy (buf, msg->message->data + msg->readcount, len);
msg->readcount += len;
return len;
}
VISIBLE float
MSG_ReadCoord (qmsg_t *msg)
{
return (short) MSG_ReadShort (msg) * (1.0 / 8.0);
}
VISIBLE void
MSG_ReadCoordV (qmsg_t *msg, vec3_t coord)
{
int i;
for (i = 0; i < 3; i++)
coord[i] = (short) MSG_ReadShort (msg) * (1.0 / 8.0);
}
VISIBLE void
MSG_ReadCoordAngleV (qmsg_t *msg, vec3_t coord, vec3_t angles)
{
int i;
for (i = 0; i < 3; i++) {
coord[i] = (short) MSG_ReadShort (msg) * (1.0 / 8.0);
angles[i] = ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
}
}
VISIBLE float
MSG_ReadAngle (qmsg_t *msg)
{
return ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
}
VISIBLE void
MSG_ReadAngleV (qmsg_t *msg, vec3_t angles)
{
int i;
for (i = 0; i < 3; i++)
angles[i] = ((signed char) MSG_ReadByte (msg)) * (360.0 / 256.0);
}
VISIBLE float
MSG_ReadAngle16 (qmsg_t *msg)
{
return (short) MSG_ReadShort (msg) * (360.0 / 65536.0);
}
VISIBLE void
MSG_ReadAngle16V (qmsg_t *msg, vec3_t angles)
{
int i;
for (i = 0; i < 3; i++)
angles[i] = (short) MSG_ReadShort (msg) * (360.0 / 65536.0);
}
VISIBLE int
MSG_ReadUTF8 (qmsg_t *msg)
{
byte *buf, *start, c;
int val = 0, count;
if (msg->badread || msg->message->cursize == msg->readcount) {
msg->badread = true;
return -1;
}
buf = start = msg->message->data + msg->readcount;
c = *buf++;
if (c < 0x80) { // 0x00 - 0x7f 1,7,7
val = c;
count = 1;
} else if (c < 0xc0) { // 0x80 - 0xbf not a valid first byte
msg->badread = true;
return -1;
} else if (c < 0xe0) { // 0xc0 - 0xdf 2,5,11
count = 2;
val = c & 0x1f;
} else if (c < 0xf0) { // 0xe0 - 0xef 3,4,16
count = 3;
val = c & 0x0f;
} else if (c < 0xf8) { // 0xf0 - 0xf7 4,3,21
count = 4;
val = c & 0x07;
} else if (c < 0xfc) { // 0xf8 - 0xfb 5,2,26
count = 5;
val = c & 0x03;
} else if (c < 0xfe) { // 0xfc - 0xfd 6,1,31
count = 6;
val = c & 0x01;
} else { // 0xfe - 0xff never valid
msg->badread = true;
return -1;
}
if (count > (msg->message->cursize - msg->readcount)) {
msg->badread = true;
return -1;
}
while (--count) {
c = *buf++;
if ((c & 0xc0) != 0x80) {
msg->badread = true;
return -1;
}
val <<= 6;
val |= c & 0x3f;
}
msg->readcount += buf - start;
return val;
}
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