quakeforge/libs/util/msg.c

316 lines
4.9 KiB
C
Raw Normal View History

/*
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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#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"
/*
MESSAGE IO FUNCTIONS
Handles byte ordering and avoids alignment errors
*/
//
// writing functions
//
void
MSG_WriteChar (sizebuf_t *sb, int c)
{
byte *buf;
#ifdef PARANOID
if (c < -128 || c > 127)
Sys_Error ("MSG_WriteChar: range error");
#endif
buf = SZ_GetSpace (sb, 1);
buf[0] = c;
}
void
MSG_WriteByte (sizebuf_t *sb, int c)
{
byte *buf;
#ifdef PARANOID
if (c < 0 || c > 255)
Sys_Error ("MSG_WriteByte: range error");
#endif
buf = SZ_GetSpace (sb, 1);
buf[0] = c;
}
void
MSG_WriteShort (sizebuf_t *sb, int c)
{
byte *buf;
#ifdef PARANOID
if (c < ((short) 0x8000) || c > (short) 0x7fff)
Sys_Error ("MSG_WriteShort: range error");
#endif
buf = SZ_GetSpace (sb, 2);
buf[0] = c & 0xff;
buf[1] = c >> 8;
}
void
MSG_WriteLong (sizebuf_t *sb, int c)
{
byte *buf;
buf = SZ_GetSpace (sb, 4);
buf[0] = c & 0xff;
buf[1] = (c >> 8) & 0xff;
buf[2] = (c >> 16) & 0xff;
buf[3] = c >> 24;
}
void
MSG_WriteFloat (sizebuf_t *sb, float f)
{
union {
float f;
int l;
} dat;
dat.f = f;
dat.l = LittleLong (dat.l);
SZ_Write (sb, &dat.l, 4);
}
void
MSG_WriteString (sizebuf_t *sb, char *s)
{
if (!s)
SZ_Write (sb, "", 1);
else
SZ_Write (sb, s, strlen (s) + 1);
}
void
MSG_WriteCoord (sizebuf_t *sb, float f)
{
MSG_WriteShort (sb, (int) (f * 8));
}
void
MSG_WriteAngle (sizebuf_t *sb, float f)
{
MSG_WriteByte (sb, (int) (f * 256 / 360) & 255);
}
void
MSG_WriteAngle16 (sizebuf_t *sb, float f)
{
MSG_WriteShort (sb, (int) (f * 65536 / 360) & 65535);
}
//
// reading functions
//
void
MSG_BeginReading (msg_t *msg)
{
msg->readcount = 0;
msg->badread = false;
}
int
MSG_GetReadCount (msg_t *msg)
{
return msg->readcount;
}
// returns -1 and sets msg->badread if no more characters are available
int
MSG_ReadChar (msg_t *msg)
{
int c;
if (msg->readcount + 1 > msg->message->cursize) {
msg->badread = true;
return -1;
}
c = (signed char) msg->message->data[msg->readcount];
msg->readcount++;
return c;
}
int
MSG_ReadByte (msg_t *msg)
{
int c;
if (msg->readcount + 1 > msg->message->cursize) {
msg->badread = true;
return -1;
}
c = (unsigned char) msg->message->data[msg->readcount];
msg->readcount++;
return c;
}
int
MSG_ReadShort (msg_t *msg)
{
int c;
if (msg->readcount + 2 > msg->message->cursize) {
msg->badread = true;
return -1;
}
c = (short) (msg->message->data[msg->readcount]
+ (msg->message->data[msg->readcount + 1] << 8));
msg->readcount += 2;
return c;
}
int
MSG_ReadLong (msg_t *msg)
{
int c;
if (msg->readcount + 4 > msg->message->cursize) {
msg->badread = true;
return -1;
}
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;
}
float
MSG_ReadFloat (msg_t *msg)
{
union {
byte b[4];
float f;
int l;
} dat;
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;
}
char *
MSG_ReadString (msg_t *msg)
{
static char string[2048];
int l, c;
l = 0;
do {
c = MSG_ReadChar (msg);
if (c == -1 || c == 0)
break;
string[l] = c;
l++;
} while (l < sizeof (string) - 1);
string[l] = 0;
return string;
}
char *
MSG_ReadStringLine (msg_t *msg)
{
static char string[2048];
int l, c;
l = 0;
do {
c = MSG_ReadChar (msg);
if (c == -1 || c == 0 || c == '\n')
break;
string[l] = c;
l++;
} while (l < sizeof (string) - 1);
string[l] = 0;
return string;
}
float
MSG_ReadCoord (msg_t *msg)
{
return MSG_ReadShort (msg) * (1.0 / 8);
}
float
MSG_ReadAngle (msg_t *msg)
{
return MSG_ReadChar (msg) * (360.0 / 256);
}
float
MSG_ReadAngle16 (msg_t *msg)
{
return MSG_ReadShort (msg) * (360.0 / 65536);
}