/*
===========================================================================
Copyright (C) 1997-2006 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 the Free Software Foundation, Inc.,
51 Franklin Street, 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>
#endif

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

#ifdef __unix__
#include <unistd.h>
#endif
#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(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(char *error, ...)
{
	va_list argptr;

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

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

	exit(1);
}
#endif

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

	if (!verbose)
		return;

	va_start(argptr, format);
	vprintf(format, argptr);
	va_end(argptr);
	fflush( stdout );
}


//qb: from AAtools
/*
* Path determination
*
* assumes
*   moddir is parent of whatever directory contains the .map/.bsp
*   gamedir is parent of moddir
*   qdir is parent of gamedir
*/
char qdir[1024] = "";
char gamedir[1024] = "";
char moddir[1024] = "";

void SetQdirFromPath(char *path)
{
	char cwd_map[512];
	char *lastslash;

	memset(cwd_map, 0, sizeof(cwd_map));
	strncpy(cwd_map, path, sizeof(cwd_map) - 1);

#ifdef WIN32
	lastslash = strrchr(cwd_map, '\\');
	// I believe Win32 can use either slash type. -Max
	if (lastslash == NULL)
#endif
		lastslash = strrchr(cwd_map, '/');

	if (lastslash == NULL)
	{
		// no slashes: CWD
		Q_getwd(cwd_map); // appends path separator
	}
	else
	{
		// get rid of everything after last path separator
		lastslash++;
		*lastslash = '\0';
	}

	strcpy(moddir, cwd_map);
#ifdef WIN32
	strcat(moddir, "..\\");
#else
	strcat(moddir, "../");
#endif

	strcpy(gamedir, moddir);
#ifdef WIN32
	strcat(gamedir, "..\\");
#else
	strcat(gamedir, "../");
#endif

	strcpy(qdir, gamedir);
#ifdef WIN32
	strcat(qdir, "..\\");
#else
	strcat(qdir, "../");
#endif

}


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

char *ExpandPathAndArchive(char *path)
{
	char	*expanded;
	char	archivename[2060];

	expanded = ExpandPath(path);

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


char *copystring(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)
{
#ifdef WIN32
	if(!_getcwd(out, 256))
		Error("_getcwd failed");
	strcat(out, "\\");
#else
	if(!getcwd(out, 256)) //qb: was getwd(out)
		Error("getcwd failed");
	strcat(out, "/");
#endif
}


void Q_mkdir(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(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 = true;
			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(char *s1, 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_strcasecmp(char *s1, char *s2)
{
	return Q_strncasecmp(s1, s2, 99999);
}


char *strtoupper (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(char *check)
{
	int             i;

	for (i = 1; i<myargc; i++)
	{
		if (!Q_strcasecmp(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(char *filename)
{
	FILE	*f;

	f = fopen(filename, "wb");

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

	return f;
}

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


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

	f = fopen(filename, "r");
	if (!f)
		return false;
	fclose(f);
	return true;
}

/*
==============
LoadFile
==============
*/
int    LoadFile(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;
}


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

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

	*bufferptr = NULL;


	f = fopen(filename, "rb");

	if (!f)  //qb: print error - GDD tools
	{
		if (print_error)
			printf("  File %s failed to open\n", filename);

		return -1;
	}

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

	*bufferptr = buffer;
	return length;
}


/*
==============
TryLoadFileFromPak  //qb: GDD tools

Allows failure
==============
*/
typedef struct
{
	unsigned char magic[4];      // Name of the new WAD format
	long diroffset;               // Position of WAD directory from start of file
	long dirsize;                 // Number of entries * 0x40 (64 char)

	unsigned char bogus[50];
} pakheader_t;

typedef struct
{
	unsigned char filename[0x38];        // Name of the file, Unix style, with extension,
	// 56 chars, padded with '\0'.
	long offset;                  // Position of the entry in PACK file
	long size;                    // Size of the entry in PACK file
} pakentry_t;

int    TryLoadFileFromPak(char *filename, void **bufferptr, char *gd)
{
	FILE	*f;
	int     n, i, ret_len;
	long    dir_ents;
	void    *buffer;
	pakheader_t pak_header;
	pakentry_t *pak_entry;
	char file[1024];

	for (n = 0; filename[n] != 0; n++)
	{
		if (filename[n] == '\\')
			filename[n] = '/';
	}

	*bufferptr = NULL;

	ret_len = -1;

	for (n = 0;; n++)
	{
		if (ret_len != -1)
			break;

		sprintf(file, "%spak%d.pak", gd, n);

		f = fopen(file, "rb");

		if (!f)
		{
			//if(errno == ENOENT) jit
				return -1;

			continue;
		}

		SafeRead(f, &pak_header, sizeof(pakheader_t));

		dir_ents = pak_header.dirsize / sizeof(pakentry_t);

		pak_entry = malloc(pak_header.dirsize);

		if (pak_entry != NULL)
		{
			if (!fseek(f, pak_header.diroffset, SEEK_SET))
			{
				memset(pak_entry, 0, pak_header.dirsize);

				SafeRead(f, pak_entry, pak_header.dirsize);

				for (i = 0; i < dir_ents; i++)
				{
					for (n = 0; pak_entry[i].filename[n] != 0; n++)
					{
						if (pak_entry[i].filename[n] == '\\')
							pak_entry[i].filename[n] = '/';
					}

                    if(!Q_strncasecmp((char*)pak_entry[i].filename, filename, 56))
					{
						if (!fseek(f, pak_entry[i].offset, SEEK_SET))
						{
							buffer = malloc(pak_entry[i].size + 1);
							((char *)buffer)[pak_entry[i].size] = 0;
							SafeRead(f, buffer, pak_entry[i].size);
							*bufferptr = buffer;

							ret_len = pak_entry[i].size;
						}

						break;
					}
				}
			}
		}

		if (pak_entry != NULL)
			free(pak_entry);

		fclose(f);
	}

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

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



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

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

	strcat(path, extension);
}


void DefaultPath(char *path, 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] == '/' || 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(char *path, char *dest)
{
	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(char *path, char *dest)
{
	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(char *path, char *dest)
{
	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(char *hex)
{
	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(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(char *path)
{
	char	*ofs, c;

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

	for (ofs = path + 1; *ofs; ofs++)
	{
		c = *ofs;
		if (c == '/' || c == '\\')
		{	// create the directory
			*ofs = 0;
			Q_mkdir(path);
			*ofs = c;
		}
	}
}


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

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

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


