/*
===========================================================================
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);
}
