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quakeforge-old/qw_common/common.c

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/*
common.c - misc functions used in client and server
Copyright (C) 1996-1997 Id Software, Inc.
Portions Copyright (C) 1999,2000 Nelson Rush.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <ctype.h>
#include <common.h>
#include <crc.h>
#include <sys.h>
#include <cmd.h>
#include <console.h>
#ifdef SERVERONLY
#include <qwsvdef.h>
#else
#include <quakedef.h>
#endif
#include "config.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
void COM_InitFilesystem (void);
void COM_Path_f (void);
qboolean standard_quake = true, rogue, hipnotic;
extern cvar_t developer;
//============================================================================
// ClearLink is used for new headnodes
void ClearLink (link_t *l)
{
l->prev = l->next = l;
}
void RemoveLink (link_t *l)
{
l->next->prev = l->prev;
l->prev->next = l->next;
}
void InsertLinkBefore (link_t *l, link_t *before)
{
l->next = before;
l->prev = before->prev;
l->prev->next = l;
l->next->prev = l;
}
void InsertLinkAfter (link_t *l, link_t *after)
{
l->next = after->next;
l->prev = after;
l->prev->next = l;
l->next->prev = l;
}
/*
==============================================================================
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, Q_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);
}
void MSG_WriteDeltaUsercmd (sizebuf_t *buf, usercmd_t *from, usercmd_t *cmd)
{
int bits;
//
// send the movement message
//
bits = 0;
if (cmd->angles[0] != from->angles[0])
bits |= CM_ANGLE1;
if (cmd->angles[1] != from->angles[1])
bits |= CM_ANGLE2;
if (cmd->angles[2] != from->angles[2])
bits |= CM_ANGLE3;
if (cmd->forwardmove != from->forwardmove)
bits |= CM_FORWARD;
if (cmd->sidemove != from->sidemove)
bits |= CM_SIDE;
if (cmd->upmove != from->upmove)
bits |= CM_UP;
if (cmd->buttons != from->buttons)
bits |= CM_BUTTONS;
if (cmd->impulse != from->impulse)
bits |= CM_IMPULSE;
MSG_WriteByte (buf, bits);
if (bits & CM_ANGLE1)
MSG_WriteAngle16 (buf, cmd->angles[0]);
if (bits & CM_ANGLE2)
MSG_WriteAngle16 (buf, cmd->angles[1]);
if (bits & CM_ANGLE3)
MSG_WriteAngle16 (buf, cmd->angles[2]);
if (bits & CM_FORWARD)
MSG_WriteShort (buf, cmd->forwardmove);
if (bits & CM_SIDE)
MSG_WriteShort (buf, cmd->sidemove);
if (bits & CM_UP)
MSG_WriteShort (buf, cmd->upmove);
if (bits & CM_BUTTONS)
MSG_WriteByte (buf, cmd->buttons);
if (bits & CM_IMPULSE)
MSG_WriteByte (buf, cmd->impulse);
MSG_WriteByte (buf, cmd->msec);
}
//
// reading functions
//
int msg_readcount;
qboolean msg_badread;
void MSG_BeginReading (void)
{
msg_readcount = 0;
msg_badread = false;
}
int MSG_GetReadCount(void)
{
return msg_readcount;
}
// returns -1 and sets msg_badread if no more characters are available
int MSG_ReadChar (void)
{
int c;
if (msg_readcount+1 > net_message.cursize)
{
msg_badread = true;
return -1;
}
c = (signed char)net_message.data[msg_readcount];
msg_readcount++;
return c;
}
int MSG_ReadByte (void)
{
int c;
if (msg_readcount+1 > net_message.cursize)
{
msg_badread = true;
return -1;
}
c = (unsigned char)net_message.data[msg_readcount];
msg_readcount++;
return c;
}
int MSG_ReadShort (void)
{
int c;
if (msg_readcount+2 > net_message.cursize)
{
msg_badread = true;
return -1;
}
c = (short)(net_message.data[msg_readcount]
+ (net_message.data[msg_readcount+1]<<8));
msg_readcount += 2;
return c;
}
int MSG_ReadLong (void)
{
int c;
if (msg_readcount+4 > net_message.cursize)
{
msg_badread = true;
return -1;
}
c = net_message.data[msg_readcount]
+ (net_message.data[msg_readcount+1]<<8)
+ (net_message.data[msg_readcount+2]<<16)
+ (net_message.data[msg_readcount+3]<<24);
msg_readcount += 4;
return c;
}
float MSG_ReadFloat (void)
{
union
{
byte b[4];
float f;
int l;
} dat;
dat.b[0] = net_message.data[msg_readcount];
dat.b[1] = net_message.data[msg_readcount+1];
dat.b[2] = net_message.data[msg_readcount+2];
dat.b[3] = net_message.data[msg_readcount+3];
msg_readcount += 4;
dat.l = LittleLong (dat.l);
return dat.f;
}
char *MSG_ReadString (void)
{
static char string[2048];
int l,c;
l = 0;
do
{
c = MSG_ReadChar ();
if (c == -1 || c == 0)
break;
string[l] = c;
l++;
} while (l < sizeof(string)-1);
string[l] = 0;
return string;
}
char *MSG_ReadStringLine (void)
{
static char string[2048];
int l,c;
l = 0;
do
{
c = MSG_ReadChar ();
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 (void)
{
return MSG_ReadShort() * (1.0/8);
}
float MSG_ReadAngle (void)
{
return MSG_ReadChar() * (360.0/256);
}
float MSG_ReadAngle16 (void)
{
return MSG_ReadShort() * (360.0/65536);
}
void MSG_ReadDeltaUsercmd (usercmd_t *from, usercmd_t *move)
{
int bits;
memcpy (move, from, sizeof(*move));
bits = MSG_ReadByte ();
// read current angles
if (bits & CM_ANGLE1)
move->angles[0] = MSG_ReadAngle16 ();
if (bits & CM_ANGLE2)
move->angles[1] = MSG_ReadAngle16 ();
if (bits & CM_ANGLE3)
move->angles[2] = MSG_ReadAngle16 ();
// read movement
if (bits & CM_FORWARD)
move->forwardmove = MSG_ReadShort ();
if (bits & CM_SIDE)
move->sidemove = MSG_ReadShort ();
if (bits & CM_UP)
move->upmove = MSG_ReadShort ();
// read buttons
if (bits & CM_BUTTONS)
move->buttons = MSG_ReadByte ();
if (bits & CM_IMPULSE)
move->impulse = MSG_ReadByte ();
// read time to run command
move->msec = MSG_ReadByte ();
}
//===========================================================================
void SZ_Clear (sizebuf_t *buf)
{
buf->cursize = 0;
buf->overflowed = false;
}
void *SZ_GetSpace (sizebuf_t *buf, int length)
{
void *data;
if (buf->cursize + length > buf->maxsize)
{
if (!buf->allowoverflow)
Sys_Error ("SZ_GetSpace: overflow without allowoverflow set (%d)", buf->maxsize);
if (length > buf->maxsize)
Sys_Error ("SZ_GetSpace: %i is > full buffer size", length);
Sys_Printf ("SZ_GetSpace: overflow\n"); // because Con_Printf may be redirected
SZ_Clear (buf);
buf->overflowed = true;
}
data = buf->data + buf->cursize;
buf->cursize += length;
return data;
}
void SZ_Write (sizebuf_t *buf, void *data, int length)
{
Q_memcpy (SZ_GetSpace(buf,length),data,length);
}
void SZ_Print (sizebuf_t *buf, char *data)
{
int len;
len = Q_strlen(data)+1;
if (!buf->cursize || buf->data[buf->cursize-1])
Q_memcpy ((byte *)SZ_GetSpace(buf, len),data,len); // no trailing 0
else
Q_memcpy ((byte *)SZ_GetSpace(buf, len-1)-1,data,len); // write over trailing 0
}
//============================================================================
/*
============
COM_SkipPath
============
*/
char *COM_SkipPath (char *pathname)
{
char *last;
last = pathname;
while (*pathname)
{
if (*pathname=='/')
last = pathname+1;
pathname++;
}
return last;
}
/*
============
COM_StripExtension
============
*/
void COM_StripExtension (char *in, char *out)
{
while (*in && *in != '.')
*out++ = *in++;
*out = 0;
}
/*
============
COM_FileExtension
============
*/
char *COM_FileExtension (char *in)
{
static char exten[8];
int i;
while (*in && *in != '.')
in++;
if (!*in)
return "";
in++;
for (i=0 ; i<7 && *in ; i++,in++)
exten[i] = *in;
exten[i] = 0;
return exten;
}
/*
============
COM_FileBase
============
*/
void COM_FileBase (char *in, char *out)
{
char *s, *s2;
s = in + strlen(in) - 1;
while (s != in && *s != '.')
s--;
for (s2 = s ; *s2 && *s2 != '/' ; s2--)
;
if (s-s2 < 2)
strcpy (out,"?model?");
else
{
s--;
strncpy (out,s2+1, s-s2);
out[s-s2] = 0;
}
}
/*
==================
COM_DefaultExtension
==================
*/
void COM_DefaultExtension (char *path, char *extension)
{
char *src;
//
// if path doesn't have a .EXT, append extension
// (extension should include the .)
//
src = path + strlen(path) - 1;
while (*src != '/' && src != path)
{
if (*src == '.')
return; // it has an extension
src--;
}
strcat (path, extension);
}
//============================================================================
char com_token[1024];
/*
==============
COM_Parse
Parse a token out of a string
==============
*/
char *COM_Parse (char *data)
{
int c;
int len;
len = 0;
com_token[0] = 0;
if (!data)
return NULL;
// skip whitespace
skipwhite:
while ( (c = *data) <= ' ')
{
if (c == 0)
return NULL; // end of file;
data++;
}
// skip // comments
if (c=='/' && data[1] == '/')
{
while (*data && *data != '\n')
data++;
goto skipwhite;
}
// handle quoted strings specially
if (c == '\"')
{
data++;
while (1)
{
c = *data++;
if (c=='\"' || !c)
{
com_token[len] = 0;
return data;
}
com_token[len] = c;
len++;
}
}
// parse a regular word
do
{
com_token[len] = c;
data++;
len++;
c = *data;
} while (c>32);
com_token[len] = 0;
return data;
}
/*
================
COM_Init
================
*/
void COM_Init (void)
{
#ifdef WORDS_BIGENDIAN
BigShort = ShortNoSwap;
LittleShort = ShortSwap;
BigLong = LongNoSwap;
LittleLong = LongSwap;
BigFloat = FloatNoSwap;
LittleFloat = FloatSwap;
#else
BigShort = ShortSwap;
LittleShort = ShortNoSwap;
BigLong = LongSwap;
LittleLong = LongNoSwap;
BigFloat = FloatSwap;
LittleFloat = FloatNoSwap;
#endif
Cmd_AddCommand ("path", COM_Path_f);
COM_InitFilesystem ();
register_check ();
}
/*
============
va
does a varargs printf into a temp buffer, so I don't need to have
varargs versions of all text functions.
============
*/
char *va(char *format, ...)
{
va_list argptr;
static char string[1024];
va_start (argptr, format);
vsnprintf (string, sizeof(string), format, argptr);
va_end (argptr);
return string;
}
/// just for debugging
int memsearch (byte *start, int count, int search)
{
int i;
for (i=0 ; i<count ; i++)
if (start[i] == search)
return i;
return -1;
}
/*
=====================================================================
INFO STRINGS
=====================================================================
*/
/*
===============
Info_ValueForKey
Searches the string for the given
key and returns the associated value, or an empty string.
===============
*/
char *Info_ValueForKey (char *s, char *key)
{
char pkey[512];
static char value[4][512]; // use two buffers so compares
// work without stomping on each other
static int valueindex;
char *o;
valueindex = (valueindex + 1) % 4;
if (*s == '\\')
s++;
while (1)
{
o = pkey;
while (*s != '\\')
{
if (!*s)
return "";
*o++ = *s++;
}
*o = 0;
s++;
o = value[valueindex];
while (*s != '\\' && *s)
{
if (!*s)
return "";
*o++ = *s++;
}
*o = 0;
if (!strcmp (key, pkey) )
return value[valueindex];
if (!*s)
return "";
s++;
}
}
void Info_RemoveKey (char *s, char *key)
{
char *start;
char pkey[512];
char value[512];
char *o;
if (strstr (key, "\\"))
{
Con_Printf ("Can't use a key with a \\\n");
return;
}
while (1)
{
start = s;
if (*s == '\\')
s++;
o = pkey;
while (*s != '\\')
{
if (!*s)
return;
*o++ = *s++;
}
*o = 0;
s++;
o = value;
while (*s != '\\' && *s)
{
if (!*s)
return;
*o++ = *s++;
}
*o = 0;
if (!strcmp (key, pkey) )
{
strcpy (start, s); // remove this part
return;
}
if (!*s)
return;
}
}
void Info_RemovePrefixedKeys (char *start, char prefix)
{
char *s;
char pkey[512];
char value[512];
char *o;
s = start;
while (1)
{
if (*s == '\\')
s++;
o = pkey;
while (*s != '\\')
{
if (!*s)
return;
*o++ = *s++;
}
*o = 0;
s++;
o = value;
while (*s != '\\' && *s)
{
if (!*s)
return;
*o++ = *s++;
}
*o = 0;
if (pkey[0] == prefix)
{
Info_RemoveKey (start, pkey);
s = start;
}
if (!*s)
return;
}
}
void Info_SetValueForStarKey (char *s, char *key, char *value, int maxsize)
{
char new[1024], *v;
int c;
#ifdef SERVERONLY
extern cvar_t sv_highchars;
#endif
if (strstr (key, "\\") || strstr (value, "\\") )
{
Con_Printf ("Can't use keys or values with a \\\n");
return;
}
if (strstr (key, "\"") || strstr (value, "\"") )
{
Con_Printf ("Can't use keys or values with a \"\n");
return;
}
if (strlen(key) > 63 || strlen(value) > 63)
{
Con_Printf ("Keys and values must be < 64 characters.\n");
return;
}
// this next line is kinda trippy
if (*(v = Info_ValueForKey(s, key))) {
// key exists, make sure we have enough room for new value,
// if we don't, don't change it!
if (strlen(value) - strlen(v) + strlen(s) > maxsize) {
Con_Printf ("Info 1 string length exceeded\n");
return;
}
}
Info_RemoveKey (s, key);
if (!value || !strlen(value))
return;
snprintf(new, sizeof(new), "\\%s\\%s", key, value);
if ((int)(strlen(new) + strlen(s)) > maxsize)
{
Con_Printf ("Info 2 string length exceeded\n");
return;
}
// only copy ascii values
s += strlen(s);
v = new;
while (*v)
{
c = (unsigned char)*v++;
#ifndef SERVERONLY
// client only allows highbits on name
if (stricmp(key, "name") != 0) {
c &= 127;
if (c < 32 || c > 127)
continue;
// auto lowercase team
if (stricmp(key, "team") == 0)
c = tolower(c);
}
#else
if (!sv_highchars.value) {
c &= 127;
if (c < 32 || c > 127)
continue;
}
#endif
// c &= 127; // strip high bits
if (c > 13) // && c < 127)
*s++ = c;
}
*s = 0;
}
void Info_SetValueForKey (char *s, char *key, char *value, int maxsize)
{
if (key[0] == '*')
{
Con_Printf ("Can't set * keys\n");
return;
}
Info_SetValueForStarKey (s, key, value, maxsize);
}
void Info_Print (char *s)
{
char key[512];
char value[512];
char *o;
int l;
if (*s == '\\')
s++;
while (*s)
{
o = key;
while (*s && *s != '\\')
*o++ = *s++;
l = o - key;
if (l < 20)
{
memset (o, ' ', 20-l);
key[20] = 0;
}
else
*o = 0;
Con_Printf ("%s", key);
if (!*s)
{
Con_Printf ("MISSING VALUE\n");
return;
}
o = value;
s++;
while (*s && *s != '\\')
*o++ = *s++;
*o = 0;
if (*s)
s++;
Con_Printf ("%s\n", value);
}
}
static byte chktbl[1024 + 4] = {
0x78,0xd2,0x94,0xe3,0x41,0xec,0xd6,0xd5,0xcb,0xfc,0xdb,0x8a,0x4b,0xcc,0x85,0x01,
0x23,0xd2,0xe5,0xf2,0x29,0xa7,0x45,0x94,0x4a,0x62,0xe3,0xa5,0x6f,0x3f,0xe1,0x7a,
0x64,0xed,0x5c,0x99,0x29,0x87,0xa8,0x78,0x59,0x0d,0xaa,0x0f,0x25,0x0a,0x5c,0x58,
0xfb,0x00,0xa7,0xa8,0x8a,0x1d,0x86,0x80,0xc5,0x1f,0xd2,0x28,0x69,0x71,0x58,0xc3,
0x51,0x90,0xe1,0xf8,0x6a,0xf3,0x8f,0xb0,0x68,0xdf,0x95,0x40,0x5c,0xe4,0x24,0x6b,
0x29,0x19,0x71,0x3f,0x42,0x63,0x6c,0x48,0xe7,0xad,0xa8,0x4b,0x91,0x8f,0x42,0x36,
0x34,0xe7,0x32,0x55,0x59,0x2d,0x36,0x38,0x38,0x59,0x9b,0x08,0x16,0x4d,0x8d,0xf8,
0x0a,0xa4,0x52,0x01,0xbb,0x52,0xa9,0xfd,0x40,0x18,0x97,0x37,0xff,0xc9,0x82,0x27,
0xb2,0x64,0x60,0xce,0x00,0xd9,0x04,0xf0,0x9e,0x99,0xbd,0xce,0x8f,0x90,0x4a,0xdd,
0xe1,0xec,0x19,0x14,0xb1,0xfb,0xca,0x1e,0x98,0x0f,0xd4,0xcb,0x80,0xd6,0x05,0x63,
0xfd,0xa0,0x74,0xa6,0x86,0xf6,0x19,0x98,0x76,0x27,0x68,0xf7,0xe9,0x09,0x9a,0xf2,
0x2e,0x42,0xe1,0xbe,0x64,0x48,0x2a,0x74,0x30,0xbb,0x07,0xcc,0x1f,0xd4,0x91,0x9d,
0xac,0x55,0x53,0x25,0xb9,0x64,0xf7,0x58,0x4c,0x34,0x16,0xbc,0xf6,0x12,0x2b,0x65,
0x68,0x25,0x2e,0x29,0x1f,0xbb,0xb9,0xee,0x6d,0x0c,0x8e,0xbb,0xd2,0x5f,0x1d,0x8f,
0xc1,0x39,0xf9,0x8d,0xc0,0x39,0x75,0xcf,0x25,0x17,0xbe,0x96,0xaf,0x98,0x9f,0x5f,
0x65,0x15,0xc4,0x62,0xf8,0x55,0xfc,0xab,0x54,0xcf,0xdc,0x14,0x06,0xc8,0xfc,0x42,
0xd3,0xf0,0xad,0x10,0x08,0xcd,0xd4,0x11,0xbb,0xca,0x67,0xc6,0x48,0x5f,0x9d,0x59,
0xe3,0xe8,0x53,0x67,0x27,0x2d,0x34,0x9e,0x9e,0x24,0x29,0xdb,0x69,0x99,0x86,0xf9,
0x20,0xb5,0xbb,0x5b,0xb0,0xf9,0xc3,0x67,0xad,0x1c,0x9c,0xf7,0xcc,0xef,0xce,0x69,
0xe0,0x26,0x8f,0x79,0xbd,0xca,0x10,0x17,0xda,0xa9,0x88,0x57,0x9b,0x15,0x24,0xba,
0x84,0xd0,0xeb,0x4d,0x14,0xf5,0xfc,0xe6,0x51,0x6c,0x6f,0x64,0x6b,0x73,0xec,0x85,
0xf1,0x6f,0xe1,0x67,0x25,0x10,0x77,0x32,0x9e,0x85,0x6e,0x69,0xb1,0x83,0x00,0xe4,
0x13,0xa4,0x45,0x34,0x3b,0x40,0xff,0x41,0x82,0x89,0x79,0x57,0xfd,0xd2,0x8e,0xe8,
0xfc,0x1d,0x19,0x21,0x12,0x00,0xd7,0x66,0xe5,0xc7,0x10,0x1d,0xcb,0x75,0xe8,0xfa,
0xb6,0xee,0x7b,0x2f,0x1a,0x25,0x24,0xb9,0x9f,0x1d,0x78,0xfb,0x84,0xd0,0x17,0x05,
0x71,0xb3,0xc8,0x18,0xff,0x62,0xee,0xed,0x53,0xab,0x78,0xd3,0x65,0x2d,0xbb,0xc7,
0xc1,0xe7,0x70,0xa2,0x43,0x2c,0x7c,0xc7,0x16,0x04,0xd2,0x45,0xd5,0x6b,0x6c,0x7a,
0x5e,0xa1,0x50,0x2e,0x31,0x5b,0xcc,0xe8,0x65,0x8b,0x16,0x85,0xbf,0x82,0x83,0xfb,
0xde,0x9f,0x36,0x48,0x32,0x79,0xd6,0x9b,0xfb,0x52,0x45,0xbf,0x43,0xf7,0x0b,0x0b,
0x19,0x19,0x31,0xc3,0x85,0xec,0x1d,0x8c,0x20,0xf0,0x3a,0xfa,0x80,0x4d,0x2c,0x7d,
0xac,0x60,0x09,0xc0,0x40,0xee,0xb9,0xeb,0x13,0x5b,0xe8,0x2b,0xb1,0x20,0xf0,0xce,
0x4c,0xbd,0xc6,0x04,0x86,0x70,0xc6,0x33,0xc3,0x15,0x0f,0x65,0x19,0xfd,0xc2,0xd3,
// map checksum goes here
0x00,0x00,0x00,0x00
};
#if 0
static byte chkbuf[16 + 60 + 4];
static unsigned last_mapchecksum = 0;
/*
====================
COM_BlockSequenceCheckByte
For proxy protecting
====================
*/
byte COM_BlockSequenceCheckByte (byte *base, int length, int sequence, unsigned mapchecksum)
{
int checksum;
byte *p;
if (last_mapchecksum != mapchecksum) {
last_mapchecksum = mapchecksum;
chktbl[1024] = (mapchecksum & 0xff000000) >> 24;
chktbl[1025] = (mapchecksum & 0x00ff0000) >> 16;
chktbl[1026] = (mapchecksum & 0x0000ff00) >> 8;
chktbl[1027] = (mapchecksum & 0x000000ff);
Com_BlockFullChecksum (chktbl, sizeof(chktbl), chkbuf);
}
p = chktbl + (sequence % (sizeof(chktbl) - 8));
if (length > 60)
length = 60;
memcpy (chkbuf + 16, base, length);
length += 16;
chkbuf[length] = (sequence & 0xff) ^ p[0];
chkbuf[length+1] = p[1];
chkbuf[length+2] = ((sequence>>8) & 0xff) ^ p[2];
chkbuf[length+3] = p[3];
length += 4;
checksum = LittleLong(Com_BlockChecksum (chkbuf, length));
checksum &= 0xff;
return checksum;
}
#endif
/*
====================
COM_BlockSequenceCRCByte
For proxy protecting
====================
*/
byte COM_BlockSequenceCRCByte (byte *base, int length, int sequence)
{
unsigned short crc;
byte *p;
byte chkb[60 + 4];
p = chktbl + (sequence % (sizeof(chktbl) - 8));
if (length > 60)
length = 60;
memcpy (chkb, base, length);
chkb[length] = (sequence & 0xff) ^ p[0];
chkb[length+1] = p[1];
chkb[length+2] = ((sequence>>8) & 0xff) ^ p[2];
chkb[length+3] = p[3];
length += 4;
crc = CRC_Block(chkb, length);
crc &= 0xff;
return crc;
}
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