cmdlib.c

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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.

Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
// cmdlib.c

#include "cmdlib.h"
#include <sys/types.h>
#include <sys/stat.h>

#ifdef WIN32
#include <direct.h>
#include <windows.h>
#endif

#ifdef NeXT
#include <libc.h>
#endif

#define BASEDIRNAME "quake"     // assumed to have a 2 or 3 following
#define PATHSEPERATOR   '/'

// set these before calling CheckParm
int myargc;
char **myargv;

char        com_token[1024];
qboolean    com_eof;

qboolean        archive;
char            archivedir[1024];


/*
===================
ExpandWildcards

Mimic unix command line expansion
===================
*/
#define MAX_EX_ARGC 1024
int     ex_argc;
char    *ex_argv[MAX_EX_ARGC];
#ifdef _WIN32
#include "io.h"
void ExpandWildcards( int *argc, char ***argv )
{
    struct _finddata_t fileinfo;
    int     handle;
    int     i;
    char    filename[1024];
    char    filebase[1024];
    char    *path;

    ex_argc = 0;
    for (i=0 ; i<*argc ; i++)
    {
        path = (*argv)[i];
        if ( path[0] == '-'
            || ( !strstr(path, "*") && !strstr(path, "?") ) )
        {
            ex_argv[ex_argc++] = path;
            continue;
        }

        handle = _findfirst (path, &fileinfo);
        if (handle == -1)
            return;

        ExtractFilePath (path, filebase);

        do
        {
            sprintf (filename, "%s%s", filebase, fileinfo.name);
            ex_argv[ex_argc++] = copystring (filename);
        } while (_findnext( handle, &fileinfo ) != -1);

        _findclose (handle);
    }

    *argc = ex_argc;
    *argv = ex_argv;
}
#else
void ExpandWildcards (int *argc, char ***argv)
{
}
#endif

#ifdef WIN_ERROR
#include <windows.h>
/*
=================
Error

For abnormal program terminations in windowed apps
=================
*/
void Error( const char *error, ... )
{
    va_list argptr;
    char    text[1024];
    char    text2[1024];
    int     err;

    err = GetLastError ();

    va_start (argptr,error);
    vsprintf (text, error,argptr);
    va_end (argptr);

    sprintf (text2, "%s\nGetLastError() = %i", text, err);
    MessageBox(NULL, text2, "Error", 0 /* MB_OK */ );

    exit (1);
}

#else
/*
=================
Error

For abnormal program terminations in console apps
=================
*/
void Error( const char *error, ...)
{
    va_list argptr;

    _printf ("\n************ ERROR ************\n");

    va_start (argptr,error);
    vprintf (error,argptr);
    va_end (argptr);
    _printf ("\r\n");

    exit (1);
}
#endif

// only printf if in verbose mode
qboolean verbose = qfalse;
void qprintf( const char *format, ... ) {
    va_list argptr;

    if (!verbose)
        return;

    va_start (argptr,format);
    vprintf (format,argptr);
    va_end (argptr);

}

#ifdef WIN32
HWND hwndOut = NULL;
qboolean lookedForServer = qfalse;
UINT wm_BroadcastCommand = -1;
#endif

void _printf( const char *format, ... ) {
    va_list argptr;
  char text[4096];
  ATOM a;

    va_start (argptr,format);
    vsprintf (text, format, argptr);
    va_end (argptr);

  printf(text);

#ifdef WIN32
  if (!lookedForServer) {
    lookedForServer = qtrue;
    hwndOut = FindWindow(NULL, "Q3Map Process Server");
    if (hwndOut) {
      wm_BroadcastCommand = RegisterWindowMessage( "Q3MPS_BroadcastCommand" );
    }
  }
  if (hwndOut) {
    a = GlobalAddAtom(text);
    PostMessage(hwndOut, wm_BroadcastCommand, 0, (LPARAM)a);
  }
#endif
}


/*

qdir will hold the path up to the quake directory, including the slash

  f:\quake\
  /raid/quake/

gamedir will hold qdir + the game directory (id1, id2, etc)

  */

char        qdir[1024];
char        gamedir[1024];
char        writedir[1024];

void SetQdirFromPath( const char *path )
{
    char    temp[1024];
    const char  *c;
  const char *sep;
    int     len, count;

    if (!(path[0] == '/' || path[0] == '\\' || path[1] == ':'))
    {   // path is partial
        Q_getwd (temp);
        strcat (temp, path);
        path = temp;
    }

    // search for "quake2" in path

    len = strlen(BASEDIRNAME);
    for (c=path+strlen(path)-1 ; c != path ; c--)
    {
        int i;

        if (!Q_strncasecmp (c, BASEDIRNAME, len))
        {
      //
            //strncpy (qdir, path, c+len+2-path);
      // the +2 assumes a 2 or 3 following quake which is not the
      // case with a retail install
      // so we need to add up how much to the next separator
      sep = c + len;
      count = 1;
      while (*sep && *sep != '/' && *sep != '\\')
      {
        sep++;
        count++;
      }
            strncpy (qdir, path, c+len+count-path);
            qprintf ("qdir: %s\n", qdir);
            for ( i = 0; i < strlen( qdir ); i++ )
            {
                if ( qdir[i] == '\\' ) 
                    qdir[i] = '/';
            }

            c += len+count;
            while (*c)
            {
                if (*c == '/' || *c == '\\')
                {
                    strncpy (gamedir, path, c+1-path);

                    for ( i = 0; i < strlen( gamedir ); i++ )
                    {
                        if ( gamedir[i] == '\\' ) 
                            gamedir[i] = '/';
                    }

                    qprintf ("gamedir: %s\n", gamedir);

                    if ( !writedir[0] )
                        strcpy( writedir, gamedir );
                    else if ( writedir[strlen( writedir )-1] != '/' )
                    {
                        writedir[strlen( writedir )] = '/';
                        writedir[strlen( writedir )+1] = 0;
                    }

                    return;
                }
                c++;
            }
            Error ("No gamedir in %s", path);
            return;
        }
    }
    Error ("SetQdirFromPath: no '%s' in %s", BASEDIRNAME, path);
}

char *ExpandArg (const char *path)
{
    static char full[1024];

    if (path[0] != '/' && path[0] != '\\' && path[1] != ':')
    {
        Q_getwd (full);
        strcat (full, path);
    }
    else
        strcpy (full, path);
    return full;
}

char *ExpandPath (const char *path)
{
    static char full[1024];
    if (!qdir)
        Error ("ExpandPath called without qdir set");
    if (path[0] == '/' || path[0] == '\\' || path[1] == ':') {
        strcpy( full, path );
        return full;
    }
    sprintf (full, "%s%s", qdir, path);
    return full;
}

char *ExpandGamePath (const char *path)
{
    static char full[1024];
    if (!qdir)
        Error ("ExpandGamePath called without qdir set");
    if (path[0] == '/' || path[0] == '\\' || path[1] == ':') {
        strcpy( full, path );
        return full;
    }
    sprintf (full, "%s%s", gamedir, path);
    return full;
}

char *ExpandPathAndArchive (const char *path)
{
    char    *expanded;
    char    archivename[1024];

    expanded = ExpandPath (path);

    if (archive)
    {
        sprintf (archivename, "%s/%s", archivedir, path);
        QCopyFile (expanded, archivename);
    }
    return expanded;
}


char *copystring(const char *s)
{
    char    *b;
    b = malloc(strlen(s)+1);
    strcpy (b, s);
    return b;
}



/*
================
I_FloatTime
================
*/
double I_FloatTime (void)
{
    time_t  t;
    
    time (&t);
    
    return t;
#if 0
// more precise, less portable
    struct timeval tp;
    struct timezone tzp;
    static int      secbase;

    gettimeofday(&tp, &tzp);
    
    if (!secbase)
    {
        secbase = tp.tv_sec;
        return tp.tv_usec/1000000.0;
    }
    
    return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
#endif
}

void Q_getwd (char *out)
{
    int i = 0;

#ifdef WIN32
   _getcwd (out, 256);
   strcat (out, "\\");
#else
   getwd (out);
   strcat (out, "/");
#endif

   while ( out[i] != 0 )
   {
       if ( out[i] == '\\' )
           out[i] = '/';
       i++;
   }
}


void Q_mkdir (const char *path)
{
#ifdef WIN32
    if (_mkdir (path) != -1)
        return;
#else
    if (mkdir (path, 0777) != -1)
        return;
#endif
    if (errno != EEXIST)
        Error ("mkdir %s: %s",path, strerror(errno));
}

/*
============
FileTime

returns -1 if not present
============
*/
int FileTime (const char *path)
{
    struct  stat    buf;
    
    if (stat (path,&buf) == -1)
        return -1;
    
    return buf.st_mtime;
}



/*
==============
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)
        {
            com_eof = qtrue;
            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++;
        do
        {
            c = *data++;
            if (c=='\"')
            {
                com_token[len] = 0;
                return data;
            }
            com_token[len] = c;
            len++;
        } while (1);
    }

// parse single characters
    if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
    {
        com_token[len] = c;
        len++;
        com_token[len] = 0;
        return data+1;
    }

// parse a regular word
    do
    {
        com_token[len] = c;
        data++;
        len++;
        c = *data;
    if (c=='{' || c=='}'|| c==')'|| c=='(' || c=='\'' || c==':')
            break;
    } while (c>32);
    
    com_token[len] = 0;
    return data;
}


int Q_strncasecmp (const char *s1, const char *s2, int n)
{
    int     c1, c2;
    
    do
    {
        c1 = *s1++;
        c2 = *s2++;

        if (!n--)
            return 0;       // strings are equal until end point
        
        if (c1 != c2)
        {
            if (c1 >= 'a' && c1 <= 'z')
                c1 -= ('a' - 'A');
            if (c2 >= 'a' && c2 <= 'z')
                c2 -= ('a' - 'A');
            if (c1 != c2)
                return -1;      // strings not equal
        }
    } while (c1);
    
    return 0;       // strings are equal
}

int Q_stricmp (const char *s1, const char *s2)
{
    return Q_strncasecmp (s1, s2, 99999);
}


char *strupr (char *start)
{
    char    *in;
    in = start;
    while (*in)
    {
        *in = toupper(*in);
        in++;
    }
    return start;
}

char *strlower (char *start)
{
    char    *in;
    in = start;
    while (*in)
    {
        *in = tolower(*in); 
        in++;
    }
    return start;
}


/*
=============================================================================

                        MISC FUNCTIONS

=============================================================================
*/


/*
=================
CheckParm

Checks for the given parameter in the program's command line arguments
Returns the argument number (1 to argc-1) or 0 if not present
=================
*/
int CheckParm (const char *check)
{
    int             i;

    for (i = 1;i<myargc;i++)
    {
        if ( !Q_stricmp(check, myargv[i]) )
            return i;
    }

    return 0;
}



/*
================
Q_filelength
================
*/
int Q_filelength (FILE *f)
{
    int     pos;
    int     end;

    pos = ftell (f);
    fseek (f, 0, SEEK_END);
    end = ftell (f);
    fseek (f, pos, SEEK_SET);

    return end;
}


FILE *SafeOpenWrite (const char *filename)
{
    FILE    *f;

    f = fopen(filename, "wb");

    if (!f)
        Error ("Error opening %s: %s",filename,strerror(errno));

    return f;
}

FILE *SafeOpenRead (const char *filename)
{
    FILE    *f;

    f = fopen(filename, "rb");

    if (!f)
        Error ("Error opening %s: %s",filename,strerror(errno));

    return f;
}


void SafeRead (FILE *f, void *buffer, int count)
{
    if ( fread (buffer, 1, count, f) != (size_t)count)
        Error ("File read failure");
}


void SafeWrite (FILE *f, const void *buffer, int count)
{
    if (fwrite (buffer, 1, count, f) != (size_t)count)
        Error ("File write failure");
}


/*
==============
FileExists
==============
*/
qboolean    FileExists (const char *filename)
{
    FILE    *f;

    f = fopen (filename, "r");
    if (!f)
        return qfalse;
    fclose (f);
    return qtrue;
}

/*
==============
LoadFile
==============
*/
int    LoadFile( const char *filename, void **bufferptr )
{
    FILE    *f;
    int    length;
    void    *buffer;

    f = SafeOpenRead (filename);
    length = Q_filelength (f);
    buffer = malloc (length+1);
    ((char *)buffer)[length] = 0;
    SafeRead (f, buffer, length);
    fclose (f);

    *bufferptr = buffer;
    return length;
}


/*
==============
LoadFileBlock
-
rounds up memory allocation to 4K boundry
-
==============
*/
int    LoadFileBlock( const char *filename, void **bufferptr )
{
    FILE    *f;
    int    length, nBlock, nAllocSize;
    void    *buffer;

    f = SafeOpenRead (filename);
    length = Q_filelength (f);
  nAllocSize = length;
  nBlock = nAllocSize % MEM_BLOCKSIZE;
  if ( nBlock > 0) {
    nAllocSize += MEM_BLOCKSIZE - nBlock;
  }
    buffer = malloc (nAllocSize+1);
  memset(buffer, 0, nAllocSize+1);
    SafeRead (f, buffer, length);
    fclose (f);

    *bufferptr = buffer;
    return length;
}


/*
==============
TryLoadFile

Allows failure
==============
*/
int    TryLoadFile (const char *filename, void **bufferptr)
{
    FILE    *f;
    int    length;
    void    *buffer;

    *bufferptr = NULL;

    f = fopen (filename, "rb");
    if (!f)
        return -1;
    length = Q_filelength (f);
    buffer = malloc (length+1);
    ((char *)buffer)[length] = 0;
    SafeRead (f, buffer, length);
    fclose (f);

    *bufferptr = buffer;
    return length;
}


/*
==============
SaveFile
==============
*/
void    SaveFile (const char *filename, const void *buffer, int count)
{
    FILE    *f;

    f = SafeOpenWrite (filename);
    SafeWrite (f, buffer, count);
    fclose (f);
}



void DefaultExtension (char *path, const char *extension)
{
    char    *src;
//
// if path doesnt have a .EXT, append extension
// (extension should include the .)
//
    src = path + strlen(path) - 1;

    while (*src != '/' && *src != '\\' && src != path)
    {
        if (*src == '.')
            return;                 // it has an extension
        src--;
    }

    strcat (path, extension);
}


void DefaultPath (char *path, const char *basepath)
{
    char    temp[128];

    if (path[0] == PATHSEPERATOR)
        return;                   // absolute path location
    strcpy (temp,path);
    strcpy (path,basepath);
    strcat (path,temp);
}


void    StripFilename (char *path)
{
    int             length;

    length = strlen(path)-1;
    while (length > 0 && path[length] != PATHSEPERATOR)
        length--;
    path[length] = 0;
}

void    StripExtension (char *path)
{
    int             length;

    length = strlen(path)-1;
    while (length > 0 && path[length] != '.')
    {
        length--;
        if (path[length] == '/')
            return;     // no extension
    }
    if (length)
        path[length] = 0;
}


/*
====================
Extract file parts
====================
*/
// FIXME: should include the slash, otherwise
// backing to an empty path will be wrong when appending a slash
void ExtractFilePath (const char *path, char *dest)
{
    const char    *src;

    src = path + strlen(path) - 1;

//
// back up until a \ or the start
//
    while (src != path && *(src-1) != '\\' && *(src-1) != '/')
        src--;

    memcpy (dest, path, src-path);
    dest[src-path] = 0;
}

void ExtractFileBase (const char *path, char *dest)
{
    const char    *src;

    src = path + strlen(path) - 1;

//
// back up until a \ or the start
//
    while (src != path && *(src-1) != PATHSEPERATOR)
        src--;

    while (*src && *src != '.')
    {
        *dest++ = *src++;
    }
    *dest = 0;
}

void ExtractFileExtension (const char *path, char *dest)
{
    const char    *src;

    src = path + strlen(path) - 1;

//
// back up until a . or the start
//
    while (src != path && *(src-1) != '.')
        src--;
    if (src == path)
    {
        *dest = 0;  // no extension
        return;
    }

    strcpy (dest,src);
}


/*
==============
ParseNum / ParseHex
==============
*/
int ParseHex (const char *hex)
{
    const char    *str;
    int    num;

    num = 0;
    str = hex;

    while (*str)
    {
        num <<= 4;
        if (*str >= '0' && *str <= '9')
            num += *str-'0';
        else if (*str >= 'a' && *str <= 'f')
            num += 10 + *str-'a';
        else if (*str >= 'A' && *str <= 'F')
            num += 10 + *str-'A';
        else
            Error ("Bad hex number: %s",hex);
        str++;
    }

    return num;
}


int ParseNum (const char *str)
{
    if (str[0] == '$')
        return ParseHex (str+1);
    if (str[0] == '0' && str[1] == 'x')
        return ParseHex (str+2);
    return atol (str);
}



/*
============================================================================

                    BYTE ORDER FUNCTIONS

============================================================================
*/

#ifdef _SGI_SOURCE
#define __BIG_ENDIAN__
#endif

#ifdef __BIG_ENDIAN__

short   LittleShort (short l)
{
    byte    b1,b2;

    b1 = l&255;
    b2 = (l>>8)&255;

    return (b1<<8) + b2;
}

short   BigShort (short l)
{
    return l;
}


int    LittleLong (int l)
{
    byte    b1,b2,b3,b4;

    b1 = l&255;
    b2 = (l>>8)&255;
    b3 = (l>>16)&255;
    b4 = (l>>24)&255;

    return ((int)b1<<24) + ((int)b2<<16) + ((int)b3<<8) + b4;
}

int    BigLong (int l)
{
    return l;
}


float   LittleFloat (float l)
{
    union {byte b[4]; float f;} in, out;
    
    in.f = l;
    out.b[0] = in.b[3];
    out.b[1] = in.b[2];
    out.b[2] = in.b[1];
    out.b[3] = in.b[0];
    
    return out.f;
}

float   BigFloat (float l)
{
    return l;
}


#else


short   BigShort (short l)
{
    byte    b1,b2;

    b1 = l&255;
    b2 = (l>>8)&255;

    return (b1<<8) + b2;
}

short   LittleShort (short l)
{
    return l;
}


int    BigLong (int l)
{
    byte    b1,b2,b3,b4;

    b1 = l&255;
    b2 = (l>>8)&255;
    b3 = (l>>16)&255;
    b4 = (l>>24)&255;

    return ((int)b1<<24) + ((int)b2<<16) + ((int)b3<<8) + b4;
}

int    LittleLong (int l)
{
    return l;
}

float   BigFloat (float l)
{
    union {byte b[4]; float f;} in, out;
    
    in.f = l;
    out.b[0] = in.b[3];
    out.b[1] = in.b[2];
    out.b[2] = in.b[1];
    out.b[3] = in.b[0];
    
    return out.f;
}

float   LittleFloat (float l)
{
    return l;
}


#endif


//=======================================================


// FIXME: byte swap?

// this is a 16 bit, non-reflected CRC using the polynomial 0x1021
// and the initial and final xor values shown below...  in other words, the
// CCITT standard CRC used by XMODEM

#define CRC_INIT_VALUE  0xffff
#define CRC_XOR_VALUE   0x0000

static unsigned short crctable[256] =
{
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
    0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
    0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
    0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
    0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
    0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
    0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
    0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
    0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
    0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
    0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
    0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
    0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
    0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
    0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
    0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
    0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
    0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
    0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
    0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};

void CRC_Init(unsigned short *crcvalue)
{
    *crcvalue = CRC_INIT_VALUE;
}

void CRC_ProcessByte(unsigned short *crcvalue, byte data)
{
    *crcvalue = (*crcvalue << 8) ^ crctable[(*crcvalue >> 8) ^ data];
}

unsigned short CRC_Value(unsigned short crcvalue)
{
    return crcvalue ^ CRC_XOR_VALUE;
}
//=============================================================================

/*
============
CreatePath
============
*/
void    CreatePath (const char *path)
{
    const char  *ofs;
    char        c;
    char        dir[1024];

#ifdef _WIN32
    int     olddrive = -1;

    if ( path[1] == ':' )
    {
        olddrive = _getdrive();
        _chdrive( toupper( path[0] ) - 'A' + 1 );
    }
#endif

    if (path[1] == ':')
        path += 2;

    for (ofs = path+1 ; *ofs ; ofs++)
    {
        c = *ofs;
        if (c == '/' || c == '\\')
        {   // create the directory
            memcpy( dir, path, ofs - path );
            dir[ ofs - path ] = 0;
            Q_mkdir( dir );
        }
    }

#ifdef _WIN32
    if ( olddrive != -1 )
    {
        _chdrive( olddrive );
    }
#endif
}


/*
============
QCopyFile

  Used to archive source files
============
*/
void QCopyFile (const char *from, const char *to)
{
    void    *buffer;
    int     length;

    length = LoadFile (from, &buffer);
    CreatePath (to);
    SaveFile (to, buffer, length);
    free (buffer);
}

---