Xash3DArchive/launch/filesystem.c

//=======================================================================
//			Copyright XashXT Group 2007 ©
//		  filesystem.c - game filesystem based on DP fs
//=======================================================================

#include "launch.h"
#include "qfiles_ref.h"
#include "filesystem.h"
#include "byteorder.h"
#include "library.h"
#include "mathlib.h"

#define ZIP_END_CDIR_SIZE		22
#define ZIP_CDIR_CHUNK_BASE_SIZE	46
#define ZIP_LOCAL_CHUNK_BASE_SIZE	30

#define FILE_FLAG_PACKED		(1<<0) // inside a package (PAK or PK3)
#define FILE_FLAG_CRYPTED		(1<<1) // file is crypted (PAK2)
#define FILE_FLAG_DEFLATED		(1<<2) // (PK3 only)
#define PACKFILE_FLAG_TRUEOFFS	(1<<0) // the offset in packfile_t is the true contents offset
#define PACKFILE_FLAG_DEFLATED	(1<<1) // file compressed using the deflate algorithm
#define FILE_BUFF_SIZE		2048

typedef struct
{
	z_stream		zstream;
	size_t		comp_length;		// length of the compressed file
	size_t		in_ind, in_len;		// input buffer current index and length
	size_t		in_position;		// position in the compressed file
	byte		input [FILE_BUFF_SIZE];
} ztoolkit_t;

typedef struct stringlist_s
{
	// maxstrings changes as needed, causing reallocation of strings[] array
	int	maxstrings;
	int	numstrings;
	char	**strings;
} stringlist_t;

typedef struct wadtype_s
{
	char	*ext;
	char	type;
} wadtype_t;

typedef struct file_s
{
	int		flags;
	int		handle;			// file descriptor
	fs_offset_t	real_length;		// uncompressed file size (for files opened in "read" mode)
	fs_offset_t	position;			// current position in the file
	fs_offset_t	offset;			// offset into the package (0 if external file)
	int		ungetc;			// single stored character from ungetc, cleared to EOF when read
	time_t		filetime;			// pak, wad or real filetime
						// Contents buffer
	fs_offset_t	buff_ind, buff_len;		// buffer current index and length
	byte		buff [FILE_BUFF_SIZE];
	ztoolkit_t*	ztk;			// For zipped files
};

typedef struct vfile_s
{
	byte		*buff;
	file_t		*handle;
	int		mode;

	bool		compress;
	fs_offset_t	buffsize;
	fs_offset_t	length;
	fs_offset_t	offset;
};

typedef struct wfile_s
{
	char		filename [MAX_SYSPATH];
	int		infotableofs;
	byte		*mempool;	// W_ReadLump temp buffers
	int		numlumps;
	int		mode;
	file_t		*file;
	dlumpinfo_t	*lumps;
	time_t		filetime;
};

typedef struct packfile_s
{
	char		name[128];
	int		flags;
	fs_offset_t	offset;
	fs_offset_t	packsize;	// size in the package
	fs_offset_t	realsize;	// real file size (uncompressed)
} packfile_t;

typedef struct pack_s
{
	char		filename [MAX_SYSPATH];
	int		handle;
	int		numfiles;
	packfile_t	*files;
	time_t		filetime;	// common for all packed files
} pack_t;

typedef struct searchpath_s
{
	char		filename[MAX_SYSPATH];
	pack_t		*pack;
	wfile_t		*wad;
	int		flags;
	struct searchpath_s *next;
} searchpath_t;

byte *fs_mempool;
searchpath_t *fs_searchpaths = NULL;
searchpath_t fs_directpath; // static direct path

static void FS_InitMemory( void );
const char *FS_FileExtension( const char *in );
static searchpath_t *FS_FindFile( const char *name, int *index, bool quiet, bool gamedironly );
static dlumpinfo_t *W_FindLump( wfile_t *wad, const char *name, const char matchtype );
static packfile_t* FS_AddFileToPack (const char* name, pack_t* pack, fs_offset_t offset, fs_offset_t packsize, fs_offset_t realsize, int flags);
static byte *W_LoadFile( const char *path, fs_offset_t *filesizeptr );
static bool FS_SysFileExists( const char *path );
static long FS_SysFileTime( const char *filename );
static char W_TypeFromExt( const char *lumpname );
static const char *W_ExtFromType( char lumptype );

char sys_rootdir[MAX_SYSPATH]; // system root
char fs_rootdir[MAX_SYSPATH]; // engine root directory
char fs_basedir[MAX_SYSPATH]; // base directory of game
char fs_gamedir[MAX_SYSPATH]; // game current directory
char gs_basedir[MAX_SYSPATH]; // initial dir before loading gameinfo.txt (used for compilers too)
char gs_mapname[64]; // used for compilers only

// command ilne parms
int fs_argc;
char *fs_argv[MAX_NUM_ARGVS];
bool fs_ext_path = false; // attempt to read\write from ./ or ../ pathes 
bool fs_use_wads = false; // some utilities needs this
cvar_t *fs_defaultdir;
cvar_t *fs_wadsupport;
sysinfo_t SI;

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

PRIVATE FUNCTIONS - PK3 HANDLING

=============================================================================
*/
/*
====================
PK3_GetEndOfCentralDir

Extract the end of the central directory from a PK3 package
====================
*/
bool PK3_GetEndOfCentralDir (const char *packfile, int packhandle, dpak3file_t *eocd)
{
	fs_offset_t filesize, maxsize;
	byte *buffer, *ptr;
	int ind;

	// Get the package size
	filesize = lseek (packhandle, 0, SEEK_END);
	if (filesize < ZIP_END_CDIR_SIZE) return false;

	// Load the end of the file in memory
	if (filesize < (word)0xffff + ZIP_END_CDIR_SIZE)
		maxsize = filesize;
	else maxsize = (word)0xffff + ZIP_END_CDIR_SIZE;
	buffer = (byte *)Mem_Alloc( fs_mempool, maxsize );
	lseek (packhandle, filesize - maxsize, SEEK_SET);
	if(read(packhandle, buffer, maxsize) != (fs_offset_t)maxsize)
	{
		Mem_Free(buffer);
		return false;
	}
	
	// Look for the end of central dir signature around the end of the file
	maxsize -= ZIP_END_CDIR_SIZE;
	ptr = &buffer[maxsize];
	ind = 0;
	while(BuffLittleLong(ptr) != IDPK3ENDHEADER)
	{
		if (ind == maxsize)
		{
			Mem_Free (buffer);
			return false;
		}
		ind++;
		ptr--;
	}

	Mem_Copy (eocd, ptr, ZIP_END_CDIR_SIZE);

	eocd->ident = LittleLong (eocd->ident);
	eocd->disknum = LittleShort (eocd->disknum);
	eocd->cdir_disknum = LittleShort (eocd->cdir_disknum);
	eocd->localentries = LittleShort (eocd->localentries);
	eocd->nbentries = LittleShort (eocd->nbentries);
	eocd->cdir_size = LittleLong (eocd->cdir_size);
	eocd->cdir_offset = LittleLong (eocd->cdir_offset);
	eocd->comment_size = LittleShort (eocd->comment_size);
	Mem_Free (buffer);

	return true;
}


/*
====================
PK3_BuildFileList

Extract the file list from a PK3 file
====================
*/
int PK3_BuildFileList (pack_t *pack, const dpak3file_t *eocd)
{
	byte		*central_dir, *ptr;
	uint		ind;
	fs_offset_t	remaining;

	// Load the central directory in memory
	central_dir = (byte *)Mem_Alloc( fs_mempool, eocd->cdir_size );
	lseek( pack->handle, eocd->cdir_offset, SEEK_SET );
	read( pack->handle, central_dir, eocd->cdir_size );

	// Extract the files properties
	// The parsing is done "by hand" because some fields have variable sizes and
	// the constant part isn't 4-bytes aligned, which makes the use of structs difficult
	remaining = eocd->cdir_size;
	pack->numfiles = 0;
	ptr = central_dir;
	for (ind = 0; ind < eocd->nbentries; ind++)
	{
		fs_offset_t namesize, count;

		// Checking the remaining size
		if (remaining < ZIP_CDIR_CHUNK_BASE_SIZE)
		{
			Mem_Free (central_dir);
			return -1;
		}
		remaining -= ZIP_CDIR_CHUNK_BASE_SIZE;

		// Check header
		if (BuffLittleLong (ptr) != IDPK3CDRHEADER)
		{
			Mem_Free (central_dir);
			return -1;
		}

		namesize = BuffLittleShort(&ptr[28]);	// filename length

		// Check encryption, compression, and attributes
		// 1st uint8  : general purpose bit flag
		// Check bits 0 (encryption), 3 (data descriptor after the file), and 5 (compressed patched data (?))
		// 2nd uint8 : external file attributes
		// Check bits 3 (file is a directory) and 5 (file is a volume (?))
		if((ptr[8] & 0x29) == 0 && (ptr[38] & 0x18) == 0)
		{
			// Still enough bytes for the name?
			if (remaining < namesize || namesize >= (int)sizeof (*pack->files))
			{
				Mem_Free(central_dir);
				return -1;
			}

			// WinZip doesn't use the "directory" attribute, so we need to check the name directly
			if (ptr[ZIP_CDIR_CHUNK_BASE_SIZE + namesize - 1] != '/')
			{
				char filename [sizeof (pack->files[0].name)];
				fs_offset_t offset, packsize, realsize;
				int flags;

				// Extract the name (strip it if necessary)
				namesize = min(namesize, (int)sizeof (filename) - 1);
				Mem_Copy (filename, &ptr[ZIP_CDIR_CHUNK_BASE_SIZE], namesize);
				filename[namesize] = '\0';

				if (BuffLittleShort (&ptr[10]))
					flags = PACKFILE_FLAG_DEFLATED;
				else flags = 0;
				offset = BuffLittleLong (&ptr[42]);
				packsize = BuffLittleLong (&ptr[20]);
				realsize = BuffLittleLong (&ptr[24]);
				FS_AddFileToPack(filename, pack, offset, packsize, realsize, flags);
			}
		}

		// Skip the name, additionnal field, and comment
		// 1er uint16 : extra field length
		// 2eme uint16 : file comment length
		count = namesize + BuffLittleShort (&ptr[30]) + BuffLittleShort (&ptr[32]);
		ptr += ZIP_CDIR_CHUNK_BASE_SIZE + count;
		remaining -= count;
	}
	// If the package is empty, central_dir is NULL here
	if (central_dir != NULL) Mem_Free (central_dir);
	return pack->numfiles;
}


/*
====================
FS_LoadPackPK3

Create a package entry associated with a PK3 file
====================
*/
pack_t *FS_LoadPackPK3( const char *packfile )
{
	int		packhandle;
	int		real_nb_files;
	dpak3file_t	eocd;
	pack_t		*pack;

	packhandle = open( packfile, O_RDONLY|O_BINARY );
	if( packhandle < 0 ) return NULL;
	
	if( !PK3_GetEndOfCentralDir( packfile, packhandle, &eocd ))
	{
		MsgDev( D_NOTE, "%s is not a PK3 file\n", packfile );
		close( packhandle );
		return NULL;
	}

	// multi-volume ZIP archives are NOT allowed
	if( eocd.disknum != 0 || eocd.cdir_disknum != 0 )
	{
		MsgDev( D_NOTE, "%s is a multi-volume ZIP archive. Ignored.\n", packfile );
		close( packhandle );
		return NULL;
	}

	// Create a package structure in memory
	pack = (pack_t *)Mem_Alloc( fs_mempool, sizeof( pack_t ));
	com.strncpy( pack->filename, packfile, sizeof( pack->filename ));
	pack->handle = packhandle;
	pack->numfiles = eocd.nbentries;
	pack->files = (packfile_t *)Mem_Alloc( fs_mempool, eocd.nbentries * sizeof( packfile_t ));
	pack->filetime = FS_SysFileTime( packfile );

	real_nb_files = PK3_BuildFileList( pack, &eocd );
	if( real_nb_files < 0 )
	{
		MsgDev( D_ERROR, "%s is not a valid PK3 file\n", packfile );
		close( pack->handle );
		Mem_Free( pack );
		return NULL;
	}

	MsgDev( D_LOAD, "Adding packfile %s (%i files)\n", packfile, real_nb_files );
	return pack;
}

/*
====================
PK3_GetTrueFileOffset

Find where the true file data offset is
====================
*/
bool PK3_GetTrueFileOffset (packfile_t *pfile, pack_t *pack)
{
	byte buffer [ZIP_LOCAL_CHUNK_BASE_SIZE];
	fs_offset_t count;

	// already found?
	if (pfile->flags & PACKFILE_FLAG_TRUEOFFS) return true;

	// Load the local file description
	lseek (pack->handle, pfile->offset, SEEK_SET);
	count = read (pack->handle, buffer, ZIP_LOCAL_CHUNK_BASE_SIZE);
	if (count != ZIP_LOCAL_CHUNK_BASE_SIZE || BuffLittleLong (buffer) != IDPACKV3HEADER)
	{
		Msg("Can't retrieve file %s in package %s\n", pfile->name, pack->filename);
		return false;
	}

	// Skip name and extra field
	pfile->offset += BuffLittleShort (&buffer[26]) + BuffLittleShort (&buffer[28]) + ZIP_LOCAL_CHUNK_BASE_SIZE;
	pfile->flags |= PACKFILE_FLAG_TRUEOFFS;
	return true;
}

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

FILEMATCH COMMON SYSTEM

=============================================================================
*/
int matchpattern(const char *in, const char *pattern, bool caseinsensitive)
{
	int	c1, c2;

	while( *pattern )
	{
		switch( *pattern )
		{
		case 0:   return 1; // end of pattern
		case '?': // match any single character
			if( *in == 0 || *in == '/' || *in == '\\' || *in == ':' )
				return 0; // no match
			in++;
			pattern++;
			break;
		case '*': // match anything until following string
			if( !*in ) return 1; // match
			pattern++;
			while( *in )
			{
				if( *in == '/' || *in == '\\' || *in == ':' )
					break;
				// see if pattern matches at this offset
				if( matchpattern( in, pattern, caseinsensitive ))
					return 1;
				// nope, advance to next offset
				in++;
			}
			break;
		default:
			if( *in != *pattern )
			{
				if( !caseinsensitive )
					return 0; // no match
				c1 = *in;
				if( c1 >= 'A' && c1 <= 'Z' )
					c1 += 'a' - 'A';
				c2 = *pattern;
				if( c2 >= 'A' && c2 <= 'Z' )
					c2 += 'a' - 'A';
				if( c1 != c2) return 0; // no match
			}
			in++;
			pattern++;
			break;
		}
	}

	if( *in ) return 0; // reached end of pattern but not end of input
	return 1; // success
}

void stringlistinit( stringlist_t *list )
{
	Mem_Set( list, 0, sizeof( *list ));
}

void stringlistfreecontents(stringlist_t *list)
{
	int i;
	for (i = 0;i < list->numstrings;i++)
	{
		if (list->strings[i]) Mem_Free(list->strings[i]);
		list->strings[i] = NULL;
	}
	list->numstrings = 0;
	list->maxstrings = 0;
	if (list->strings) Mem_Free(list->strings);
}

void stringlistappend( stringlist_t *list, char *text )
{
	size_t	textlen;
	char	**oldstrings;

	if (list->numstrings >= list->maxstrings)
	{
		oldstrings = list->strings;
		list->maxstrings += 4096;
		list->strings = Mem_Alloc(fs_mempool, list->maxstrings * sizeof(*list->strings));
		if (list->numstrings) Mem_Copy(list->strings, oldstrings, list->numstrings * sizeof(*list->strings));
		if (oldstrings) Mem_Free( oldstrings );
	}
	textlen = com.strlen( text ) + 1;
	list->strings[list->numstrings] = Mem_Alloc( fs_mempool, textlen );
	Mem_Copy( list->strings[list->numstrings], text, textlen );
	list->numstrings++;
}

void stringlistsort( stringlist_t *list )
{
	int	i, j;
	char	*temp;

	// this is a selection sort (finds the best entry for each slot)
	for( i = 0; i < list->numstrings - 1; i++ )
	{
		for( j = i + 1; j < list->numstrings; j++ )
		{
			if( com.strcmp( list->strings[i], list->strings[j] ) > 0 )
			{
				temp = list->strings[i];
				list->strings[i] = list->strings[j];
				list->strings[j] = temp;
			}
		}
	}
}

void listdirectory( stringlist_t *list, const char *path )
{
	int		i;
	char		pattern[4096], *c;
	struct _finddata_t	n_file;
	long		hFile;

	com.strncpy( pattern, path, sizeof( pattern ));
	com.strncat( pattern, "*", sizeof( pattern ));

	// ask for the directory listing handle
	hFile = _findfirst( pattern, &n_file );
	if( hFile == -1 ) return;

	// start a new chain with the the first name
	stringlistappend( list, n_file.name );
	// iterate through the directory
	while( _findnext( hFile, &n_file ) == 0 )
		stringlistappend( list, n_file.name );
	_findclose( hFile );

	// convert names to lowercase because windows doesn't care, but pattern matching code often does
	for( i = 0; i < list->numstrings; i++ )
	{
		for( c = list->strings[i]; *c; c++ )
		{
			if( *c >= 'A' && *c <= 'Z' )
				*c += 'a' - 'A';
		}
	}
}

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

OTHER PRIVATE FUNCTIONS

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

/*
====================
FS_AddFileToPack

Add a file to the list of files contained into a package
====================
*/
static packfile_t* FS_AddFileToPack(const char* name, pack_t* pack, fs_offset_t offset, fs_offset_t packsize, fs_offset_t realsize, int flags)
{
	int		left, right, middle;
	packfile_t	*pfile;

	// look for the slot we should put that file into (binary search)
	left = 0;
	right = pack->numfiles - 1;
	while( left <= right )
	{
		int diff;

		middle = (left + right) / 2;
		diff = com.stricmp( pack->files[middle].name, name );

		// If we found the file, there's a problem
		if( !diff ) MsgDev( D_NOTE, "Package %s contains the file %s several times\n", pack->filename, name );

		// If we're too far in the list
		if( diff > 0 ) right = middle - 1;
		else left = middle + 1;
	}

	// We have to move the right of the list by one slot to free the one we need
	pfile = &pack->files[left];
	memmove( pfile + 1, pfile, (pack->numfiles - left) * sizeof( *pfile ));
	pack->numfiles++;

	com.strncpy( pfile->name, name, sizeof( pfile->name ));
	pfile->offset = offset;
	pfile->packsize = packsize;
	pfile->realsize = realsize;
	pfile->flags = flags;

	return pfile;
}


/*
============
FS_CreatePath

Only used for FS_Open.
============
*/
void FS_CreatePath( char *path )
{
	char *ofs, save;

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


/*
============
FS_Path_f

debug info
============
*/
void FS_Path_f( void )
{
	searchpath_t *s;

	Msg( "Current search path:\n" );
	for( s = fs_searchpaths; s; s = s->next )
	{
		if( s->pack ) Msg( "%s (%i files)\n", s->pack->filename, s->pack->numfiles );
		else if( s->wad ) Msg( "%s (%i files)\n", s->wad->filename, s->wad->numlumps );
		else Msg( "%s\n", s->filename );
	}
}

/*
============
FS_ClearPath_f

only for debug targets
============
*/
void FS_ClearPaths_f( void )
{
	FS_ClearSearchPath();
}

/*
============
FS_FileBase

Extracts the base name of a file (no path, no extension, assumes '/' as path separator)
============
*/
void _FS_FileBase( const char *in, char *out, bool kill_backwardslash )
{
	int	len, start, end;

	len = com.strlen( in );
	if( !len ) return;
	
	// scan backward for '.'
	end = len - 1;

	while( end && in[end] != '.' && in[end] != '/' && in[end] != '\\' )
		end--;
	
	if( in[end] != '.' )
		end = len-1; // no '.', copy to end
	else end--; // found ',', copy to left of '.'


	// scan backward for '/'
	start = len - 1;

	if( kill_backwardslash )
	{
		while( start >= 0 && in[start] != '/' && in[start] != '\\' )
			start--;

		if( start < 0 || ( in[start] != '/' && in[start] != '\\' ))
			start = 0;
		else start++;
	}
	else
	{
		// NOTE: some doomwads using backward slash as part of animation name
		// e.g. vile\1, so ignore backward slash for wads
		while ( start >= 0 && in[start] != '/' )
			start--;

		if ( start < 0 || in[start] != '/' )
			start = 0;
		else start++;
	}

	// length of new sting
	len = end - start + 1;

	// Copy partial string
	com.strncpy( out, &in[start], len + 1 );
	out[len] = 0;
}

void FS_FileBase( const char *in, char *out )
{
	_FS_FileBase( in, out, true );
}

void W_FileBase( const char *in, char *out )
{
	_FS_FileBase( in, out, false );
}

/*
=================
FS_LoadPackPAK

Takes an explicit (not game tree related) path to a pak file.

Loads the header and directory, adding the files at the beginning
of the list so they override previous pack files.
=================
*/
pack_t *FS_LoadPackPAK( const char *packfile )
{
	dpackheader_t	header;
	int		i, numpackfiles;
	int		packhandle;
	pack_t		*pack;
	dpackfile_t	*info;

	packhandle = open( packfile, O_RDONLY|O_BINARY );
	if( packhandle < 0 ) return NULL;
	read( packhandle, (void *)&header, sizeof( header ));

	if( header.ident != IDPACKV1HEADER )
	{
		MsgDev( D_NOTE, "%s is not a packfile. Ignored.\n", packfile );
		close( packhandle );
		return NULL;
	}
	header.dirofs = LittleLong( header.dirofs );
	header.dirlen = LittleLong( header.dirlen );

	if( header.dirlen % sizeof( dpackfile_t ))
	{
		MsgDev( D_ERROR, "%s has an invalid directory size. Ignored.\n", packfile );
		close( packhandle );
		return NULL;
	}

	numpackfiles = header.dirlen / sizeof( dpackfile_t );

	if( numpackfiles > MAX_FILES_IN_PACK )
	{
		MsgDev( D_ERROR, "%s has too many files ( %i ). Ignored.\n", packfile, numpackfiles );
		close( packhandle );
		return NULL;
	}

	info = (dpackfile_t *)Mem_Alloc( fs_mempool, sizeof( *info ) * numpackfiles );
	lseek( packhandle, header.dirofs, SEEK_SET );

	if( header.dirlen != read( packhandle, (void *)info, header.dirlen ))
	{
		MsgDev( D_NOTE, "%s is an incomplete PAK, not loading\n", packfile );
		Mem_Free( info );
		close( packhandle );
		return NULL;
	}

	pack = (pack_t *)Mem_Alloc( fs_mempool, sizeof( pack_t ));
	com.strncpy( pack->filename, packfile, sizeof( pack->filename ));
	pack->handle = packhandle;
	pack->numfiles = 0;
	pack->files = (packfile_t *)Mem_Alloc( fs_mempool, numpackfiles * sizeof( packfile_t ));
	pack->filetime = FS_SysFileTime( packfile );

	// parse the directory
	for( i = 0; i < numpackfiles; i++ )
	{
		fs_offset_t offset = LittleLong( info[i].filepos );
		fs_offset_t size = LittleLong( info[i].filelen );
		FS_AddFileToPack( info[i].name, pack, offset, size, size, PACKFILE_FLAG_TRUEOFFS );
	}

	Mem_Free( info );
	MsgDev( D_LOAD, "Adding packfile: %s (%i files)\n", packfile, numpackfiles );
	return pack;
}

/*
=================
FS_LoadPackPK2

Takes an explicit (not game tree related) path to a pak file.

Loads the header and directory, adding the files at the beginning
of the list so they override previous pack files.
=================
*/
pack_t *FS_LoadPackPK2(const char *packfile)
{
	dpackheader_t header;
	int i, numpackfiles;
	int packhandle;
	pack_t *pack;
	dpak2file_t *info;

	packhandle = open (packfile, O_RDONLY | O_BINARY);
	if (packhandle < 0) return NULL;
	read (packhandle, (void *)&header, sizeof(header));
	if(header.ident != IDPACKV2HEADER)
	{
		Msg("%s is not a packfile\n", packfile);
		close(packhandle);
		return NULL;
	}
	header.dirofs = LittleLong (header.dirofs);
	header.dirlen = LittleLong (header.dirlen);

	if (header.dirlen % sizeof(dpak2file_t))
	{
		Msg("%s has an invalid directory size\n", packfile);
		close(packhandle);
		return NULL;
	}

	numpackfiles = header.dirlen / sizeof(dpak2file_t);

	if (numpackfiles > MAX_FILES_IN_PACK)
	{
		Msg("%s has %i files\n", packfile, numpackfiles);
		close(packhandle);
		return NULL;
	}

	info = (dpak2file_t *)Mem_Alloc( fs_mempool, sizeof(*info) * numpackfiles);
	lseek (packhandle, header.dirofs, SEEK_SET);
	if(header.dirlen != read(packhandle, (void *)info, header.dirlen))
	{
		Msg("%s is an incomplete PAK, not loading\n", packfile);
		Mem_Free(info);
		close(packhandle);
		return NULL;
	}

	pack = (pack_t *)Mem_Alloc(fs_mempool, sizeof( pack_t ));
	com.strncpy( pack->filename, packfile, sizeof( pack->filename ));
	pack->handle = packhandle;
	pack->numfiles = 0;
	pack->files = (packfile_t *)Mem_Alloc( fs_mempool, numpackfiles * sizeof( packfile_t ));

	// parse the directory
	for( i = 0; i < numpackfiles; i++ )
	{
		fs_offset_t offset = LittleLong( info[i].filepos );
		fs_offset_t size = LittleLong( info[i].filelen );
		FS_AddFileToPack( info[i].name, pack, offset, size, size, PACKFILE_FLAG_TRUEOFFS );
	}

	Mem_Free( info );
	MsgDev( D_LOAD, "Adding packfile %s (%i files)\n", packfile, numpackfiles );
	return pack;
}

/*
================
FS_AddPack_Fullpath

Adds the given pack to the search path.
The pack type is autodetected by the file extension.

Returns true if the file was successfully added to the
search path or if it was already included.

If keep_plain_dirs is set, the pack will be added AFTER the first sequence of
plain directories.
================
*/
static bool FS_AddPack_Fullpath( const char *pakfile, bool *already_loaded, bool keep_plain_dirs, int flags )
{
	searchpath_t	*search;
	pack_t		*pak = NULL;
	const char	*ext = FS_FileExtension( pakfile );
	
	for( search = fs_searchpaths; search; search = search->next )
	{
		if( search->pack && !com.stricmp( search->pack->filename, pakfile ))
		{
			if( already_loaded ) *already_loaded = true;
			return true; // already loaded
		}
	}

	if( already_loaded ) *already_loaded = false;

	if( !com.stricmp( ext, "pak" )) pak = FS_LoadPackPAK( pakfile );
	else if( !com.stricmp( ext, "pk2" )) pak = FS_LoadPackPK3( pakfile );
	else if( !com.stricmp( ext, "pk3" )) pak = FS_LoadPackPK3( pakfile );
	else MsgDev( D_ERROR, "\"%s\" does not have a pack extension\n", pakfile );

	if( pak )
	{
		if( keep_plain_dirs )
		{
			// find the first item whose next one is a pack or NULL
			searchpath_t *insertion_point = 0;
			if( fs_searchpaths && !fs_searchpaths->pack )
			{
				insertion_point = fs_searchpaths;
				while( 1 )
				{
					if( !insertion_point->next ) break;
					if( insertion_point->next->pack ) break;
					insertion_point = insertion_point->next;
				}
			}

			// if insertion_point is NULL, this means that either there is no
			// item in the list yet, or that the very first item is a pack. In
			// that case, we want to insert at the beginning...
			if( !insertion_point )
			{
				search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
				search->pack = pak;
				search->next = fs_searchpaths;
				search->flags |= flags;
				fs_searchpaths = search;
			}
			else // otherwise we want to append directly after insertion_point.
			{
				search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
				search->pack = pak;
				search->next = insertion_point->next;
				search->flags |= flags;
				insertion_point->next = search;
			}
		}
		else
		{
			search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
			search->pack = pak;
			search->next = fs_searchpaths;
			search->flags |= flags;
			fs_searchpaths = search;
		}
		return true;
	}
	else
	{
		MsgDev( D_ERROR, "FS_AddPack_Fullpath: unable to load pak \"%s\"\n", pakfile );
		return false;
	}
}

/*
====================
FS_AddWad_Fullpath
====================
*/
static bool FS_AddWad_Fullpath( const char *wadfile, bool *already_loaded, bool keep_plain_dirs )
{
	searchpath_t	*search;
	wfile_t		*wad = NULL;
	const char	*ext = FS_FileExtension( wadfile );

	for( search = fs_searchpaths; search; search = search->next )
	{
		if( search->wad && !com.stricmp( search->wad->filename, wadfile ))
		{
			if( already_loaded ) *already_loaded = true;
			return true; // already loaded
		}
	}
          
	if( already_loaded ) *already_loaded = false;
	if( !com.stricmp( ext, "wad" )) wad = W_Open( wadfile, "rb" );
	else MsgDev( D_ERROR, "\"%s\" doesn't have a wad extension\n", wadfile );

	if( wad )
	{
		if( keep_plain_dirs )
		{
			// find the first item whose next one is a wad or NULL
			searchpath_t *insertion_point = NULL;
			if( fs_searchpaths && !fs_searchpaths->wad )
			{
				insertion_point = fs_searchpaths;
				while( 1 )
				{
					if( !insertion_point->next ) break;
					if( insertion_point->next->wad ) break;
					insertion_point = insertion_point->next;
				}
			}
			// if insertion_point is NULL, this means that either there is no
			// item in the list yet, or that the very first item is a wad. In
			// that case, we want to insert at the beginning...
			if( !insertion_point )
			{
				search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
				search->wad = wad;
				search->next = fs_searchpaths;
				fs_searchpaths = search;
			}
			else // otherwise we want to append directly after insertion_point.
			{
				search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
				search->wad = wad;
				search->next = insertion_point->next;
				insertion_point->next = search;
			}
		}
		else
		{
			search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
			search->wad = wad;
			search->next = fs_searchpaths;
			fs_searchpaths = search;
		}
		MsgDev( D_LOAD, "Adding wadfile %s (%i files)\n", wadfile, wad->numlumps );
		return true;
	}
	else
	{
		MsgDev( D_ERROR, "FS_AddWad_Fullpath: unable to load wad \"%s\"\n", wadfile );
		return false;
	}
}

/*
================
FS_AddPack

Adds the given pack to the search path and searches for it in the game path.
The pack type is autodetected by the file extension.

Returns true if the file was successfully added to the
search path or if it was already included.

If keep_plain_dirs is set, the pack will be added AFTER the first sequence of
plain directories.
================
*/
bool FS_AddPack( const char *pakfile, bool *already_loaded, bool keep_plain_dirs )
{
	char		fullpath[ MAX_STRING ];
	searchpath_t	*search;
	int		index;

	if( already_loaded ) *already_loaded = false;

	// then find the real name...
	search = FS_FindFile( pakfile, &index, true, false );
	if( !search || search->pack )
	{
		MsgDev( D_WARN, "FS_AddPack: could not find pak \"%s\"\n", pakfile );
		return false;
	}
	com.sprintf( fullpath, "%s%s", search->filename, pakfile );
	return FS_AddPack_Fullpath( fullpath, already_loaded, keep_plain_dirs, 0 );
}

/*
================
FS_AddGameDirectory

Sets fs_gamedir, adds the directory to the head of the path,
then loads and adds pak1.pak pak2.pak ...
================
*/
void FS_AddGameDirectory( const char *dir, int flags )
{
	stringlist_t	list;
	searchpath_t	*search;
	string		pakfile;
	search_t		*wads;
	int		i;

	if(!( flags & FS_NOWRITE_PATH ))
		com.strncpy( fs_gamedir, dir, sizeof( fs_gamedir ));

	stringlistinit( &list );
	listdirectory( &list, dir );
	stringlistsort( &list );

	// add any PAK package in the directory
	for( i = 0; i < list.numstrings; i++ )
	{
		if( !com.stricmp( FS_FileExtension( list.strings[i] ), "pak" ))
		{
			com.sprintf( pakfile, "%s%s", dir, list.strings[i] );
			FS_AddPack_Fullpath( pakfile, NULL, false, flags );
		}
	}

	// add any PK2 package in the directory
	for( i = 0; i < list.numstrings; i++ )
	{
		if( !com.stricmp( FS_FileExtension( list.strings[i]), "pk2" ))
		{
			com.sprintf( pakfile, "%s%s", dir, list.strings[i] );
			FS_AddPack_Fullpath( pakfile, NULL, false, flags );
		}
	}

	// add any PK3 package in the directory
	for( i = 0; i < list.numstrings; i++ )
	{
		if( !com.stricmp( FS_FileExtension( list.strings[i] ), "pk3" ))
		{
			com.sprintf( pakfile, "%s%s", dir, list.strings[i] );
			FS_AddPack_Fullpath( pakfile, NULL, false, flags );
		}
	}

	// add the directory to the search path
	// (unpacked files have the priority over packed files)
	search = (searchpath_t *)Mem_Alloc( fs_mempool, sizeof( searchpath_t ));
	com.strncpy( search->filename, dir, sizeof ( search->filename ));
	search->next = fs_searchpaths;
	search->flags = flags;
	fs_searchpaths = search;

	stringlistfreecontents( &list );

	if( Sys.app_name == HOST_NORMAL || Sys.app_name == HOST_DEDICATED || Sys.app_name == HOST_BSPLIB )
	{
		// because we want first add gamedir wads
		if(!( flags & FS_GAMEDIR_PATH )) return;
	}

	// use normal method because we want take access to wad files through pak or pk3 archives
	wads = FS_Search( "*.wad", true );
	for( i = 0; wads && i < wads->numfilenames; i++ )
		FS_AddWad_Fullpath( wads->filenames[i], NULL, false );
	if( wads ) Mem_Free( wads );
}

/*
================
FS_AddGameHierarchy
================
*/
void FS_AddGameHierarchy( const char *dir, int flags )
{
	// Add the common game directory
	if( dir && *dir ) FS_AddGameDirectory( va( "%s%s/", fs_basedir, dir ), flags );
}


/*
============
FS_FileExtension
============
*/
const char *FS_FileExtension( const char *in )
{
	const char *separator, *backslash, *colon, *dot;

	separator = com.strrchr( in, '/' );
	backslash = com.strrchr( in, '\\' );
	if( !separator || separator < backslash ) separator = backslash;
	colon = com.strrchr( in, ':' );
	if( !separator || separator < colon ) separator = colon;

	dot = com.strrchr( in, '.' );
	if( dot == NULL || (separator && (dot < separator)))
		return "";
	return dot + 1;
}


/*
============
FS_FileWithoutPath
============
*/
const char *FS_FileWithoutPath( const char *in )
{
	const char *separator, *backslash, *colon;

	separator = com.strrchr( in, '/' );
	backslash = com.strrchr( in, '\\' );
	if( !separator || separator < backslash ) separator = backslash;
	colon = com.strrchr( in, ':' );
	if( !separator || separator < colon ) separator = colon;
	return separator ? separator + 1 : in;
}

/*
============
FS_ExtractFilePath
============
*/
void FS_ExtractFilePath( const char* const path, char* dest )
{
	const char	*src;
	src = path + com.strlen( path ) - 1;

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

	if( src != path )
	{
		Mem_Copy( dest, path, src - path );
		dest[src - path - 1] = 0; // cutoff backslash
	}
	else com.strcpy( dest, "" ); // file without path
}

/*
================
FS_ClearSearchPath
================
*/
void FS_ClearSearchPath( void )
{
	while( fs_searchpaths )
	{
		searchpath_t *search = fs_searchpaths;

		if( search->flags & FS_STATIC_PATH )
		{
			// skip read-only pathes e.g. "bin"
			if( search->next )
				fs_searchpaths = search->next->next;
			else break;
		}
		else fs_searchpaths = search->next;

		if( search->pack )
		{
			if( search->pack->files ) 
				Mem_Free( search->pack->files );
			Mem_Free( search->pack );
		}
		if( search->wad )
		{
			W_Close( search->wad );
		}
		Mem_Free( search );
	}
}

/*
====================
FS_CheckNastyPath

Return true if the path should be rejected due to one of the following:
1: path elements that are non-portable
2: path elements that would allow access to files outside the game directory,
   or are just not a good idea for a mod to be using.
====================
*/
int FS_CheckNastyPath( const char *path, bool isgamedir )
{
	// all: never allow an empty path, as for gamedir it would access the parent directory and a non-gamedir path it is just useless
	if( !path[0] ) return 2;

	// Windows: don't allow \ in filenames (windows-only), period.
	// (on Windows \ is a directory separator, but / is also supported)
	if( com.strstr( path, "\\" ) && !fs_ext_path ) return 1; // non-portable

	// Mac: don't allow Mac-only filenames - : is a directory separator
	// instead of /, but we rely on / working already, so there's no reason to
	// support a Mac-only path
	// Amiga and Windows: : tries to go to root of drive
	if( com.strstr( path, ":" ) && !fs_ext_path ) return 1; // non-portable attempt to go to root of drive

	// Amiga: // is parent directory
	if( com.strstr( path, "//" )  && !fs_ext_path ) return 1; // non-portable attempt to go to parent directory

	// all: don't allow going to parent directory (../ or /../)
	if( com.strstr( path, ".." ) && !fs_ext_path ) return 2; // attempt to go outside the game directory

	// Windows and UNIXes: don't allow absolute paths
	if( path[0] == '/' && !fs_ext_path ) return 2; // attempt to go outside the game directory

	// all: don't allow . characters before the last slash (it should only be used in filenames, not path elements),
	// this catches all imaginable cases of ./, ../, .../, etc
	if( com.strchr( path, '.' ) && !fs_ext_path )
	{
		if( isgamedir ) return 2; // gamedir is entirely path elements, so simply forbid . entirely
		if( com.strchr( path, '.' ) < com.strrchr( path, '/' )) return 2; // possible attempt to go outside the game directory
	}

	// all: forbid trailing slash on gamedir
	if( isgamedir && !fs_ext_path && path[com.strlen( path )-1] == '/' ) return 2;

	// all: forbid leading dot on any filename for any reason
	if( com.strstr( path, "/." ) && !fs_ext_path ) return 2; // attempt to go outside the game directory

	// after all these checks we're pretty sure it's a / separated filename
	// and won't do much if any harm
	return false;
}

/*
================
FS_Rescan
================
*/
void FS_Rescan( void )
{
	MsgDev( D_NOTE, "FS_Rescan( %s )\n", SI.GameInfo->title );
	FS_ClearSearchPath();

	FS_AddGameHierarchy( SI.GameInfo->basedir, 0 );
	FS_AddGameHierarchy( SI.GameInfo->gamedir, FS_GAMEDIR_PATH );
}

void FS_Rescan_f( void )
{
	FS_Rescan();
}

void FS_CreatePathesList( void )
{
	file_t	*f;

	// make simple pathes.rc
	f = FS_Open( "pathes.rc", "w" );
	if( !f ) return; // not fatal for us

	FS_Printf (f, "//=======================================================================\n");
	FS_Printf (f, "//\t\t\tCopyright XashXT Group %s ©\n", com.timestamp( TIME_YEAR_ONLY ));
	FS_Printf (f, "//\t\t      pathes.rc - executable associations\n");
	FS_Printf (f, "//=======================================================================\n");
	FS_Printf (f, "\n");
	FS_Printf (f, "// executable name\t\tlinked basedir\n");
	FS_Printf (f, "quake.exe\t\t\tid1\n" );
	FS_Printf (f, "quake2.exe\t\tbaseq2\n" );
	FS_Printf (f, "quake3.exe\t\tbaseq3\n" );
	FS_Printf (f, "hl.exe\t\t\tvalve\n" );
	FS_Close (f);	
}

void FS_ApplyBaseDir( void )
{
	script_t	*script;
	token_t	tok;

	if( Sys.app_state == SYS_RESTART ) return; // don't associate folder names - may be collisions
	if( !FS_FileExists( "pathes.rc" )) FS_CreatePathesList();
	script = PS_LoadScript( "pathes.rc", NULL, 0 );
	if( !script ) return; // use standard methods

	while( PS_ReadToken( script, SC_ALLOW_NEWLINES|SC_ALLOW_PATHNAMES, &tok ))
	{
		FS_StripExtension( tok.string ); // cutoff .exe if present
		if( !com.stricmp( tok.string, gs_basedir ))
		{
			if( PS_ReadToken( script, SC_ALLOW_PATHNAMES, &tok ))
			{
				// install new basedir
				com.strncpy( gs_basedir, tok.string, sizeof( gs_basedir ));
				break;
			}
			else MsgDev( D_ERROR, "missing associated directory with %s.exe\n", gs_basedir );
		}
		else PS_SkipRestOfLine( script );
	}
	PS_FreeScript( script );
}

void FS_UpdateSysInfo( void )
{
	com.strcpy( SI.username, Sys_GetCurrentUser());
	SI.developer = Sys.developer;
	SI.version = XASH_VERSION;
}

static bool FS_ParseVector( script_t *script, float *v, size_t size )
{
	uint	i;
	token_t	token;
	bool	bracket = false;

	if( v == NULL || size == 0 )
		return false;

	Mem_Set( v, 0, sizeof( *v ) * size );

	if( size == 1 )
		return PS_GetFloat( script, 0, v );

	if( !PS_ReadToken( script, false, &token ))
		return false;
	if( token.type == TT_PUNCTUATION && !com.stricmp( token.string, "(" ))
		bracket = true;
	else PS_SaveToken( script, &token ); // save token to right get it again

	for( i = 0; i < size; i++ )
	{
		if( !PS_GetFloat( script, false, &v[i] ))
			v[i] = 0;	// because Com_ReadFloat may return 0 if parsing expression it's not a number
	}

	if( !bracket ) return true;	// done

	if( !PS_ReadToken( script, false, &token ))
		return false;

	if( token.type == TT_PUNCTUATION && !com.stricmp( token.string, ")" ))
		return true;
	return false;
}

void FS_CreateGameInfo( const char *filename )
{
	char *buffer = Mem_Alloc( fs_mempool, MAX_SYSPATH );

	// make simple gameinfo.txt
	com.strncat( buffer, va("// generated by Xash3D\r\r\nbasedir\t\t\"%s\"\n", gs_basedir), MAX_SYSPATH ); // add new string
	com.strncat( buffer, va("gamedir\t\t\"%s\"\n", gs_basedir ), MAX_SYSPATH);
	com.strncat( buffer, va("title\t\t\"New Game\"\rversion\t\t\"%g\"\rviewmode\t\t\"firstperson\"\r", XASH_VERSION ), MAX_SYSPATH );
	com.strncat( buffer, "gamemode\t\t\"default\"\r", MAX_SYSPATH );
	com.strncat( buffer, "\nstartmap\t\t\"newmap\"\n\n", MAX_SYSPATH );
	com.strncat( buffer, "\ngameHint\t\t\"Xash3D\"", MAX_SYSPATH );
	com.strncat( buffer, "\nsp_spawn\t\t\"info_player_start\"", MAX_SYSPATH );
	com.strncat( buffer, "\ndm_spawn\t\t\"info_player_deathmatch\"", MAX_SYSPATH );
	com.strncat( buffer, "\nctf_spawn\t\t\"info_player_ctf\"", MAX_SYSPATH );
	com.strncat( buffer, "\ncoop_spawn\t\"info_player_coop\"", MAX_SYSPATH );
	com.strncat( buffer, "\nteam_spawn\t\"info_player_team\"", MAX_SYSPATH );
	com.strncat( buffer, "\nhull0\t\t( 0 0 0 ) ( 0 0 0 )", MAX_SYSPATH );
	com.strncat( buffer, "\nhull1\t\t( -16 -16 -36 ) ( 16 16 36 )", MAX_SYSPATH );
	com.strncat( buffer, "\nhull2\t\t( -32 -32 -32 ) ( 32 32 32 )", MAX_SYSPATH );
	com.strncat( buffer, "\nhull3\t\t( -16 -16 -18 ) ( 16 16 18 )", MAX_SYSPATH );
	com.strncat( buffer, "\nviewheight0\t28", MAX_SYSPATH );
	com.strncat( buffer, "\nviewheight1\t12", MAX_SYSPATH );
	com.strncat( buffer, "\nmax_edicts\t1024", MAX_SYSPATH );
	com.strncat( buffer, "\nurl_update\t\"\"", MAX_SYSPATH );
	com.strncat( buffer, "\nurl_info\t\"\"", MAX_SYSPATH );
	com.strncat( buffer, "\n\n\n", MAX_SYSPATH );
	
	FS_WriteFile( filename, buffer, com.strlen( buffer ));
	Mem_Free( buffer );
} 

/*
================
FS_ParseGameInfo
================
*/
static bool FS_ParseGameInfo( const char *filename, gameinfo_t *GameInfo )
{
	script_t	*script = NULL;
	string	fs_path, filepath;
	token_t	token;

	com.snprintf( filepath, sizeof( filepath ), "%s/gameinfo.txt", filename );

	// force to create gameinfo for specified game if missing
	if( !com.stricmp( gs_basedir, filename ) && !FS_FileExists( filepath ))
		FS_CreateGameInfo( filepath );

	if( !GameInfo ) return false;	// no dest

	script = PS_LoadScript( filepath, NULL, 0 );
	if( !script ) return false;

	// setup default values
	com.strncpy( GameInfo->gamefolder, filename, MAX_STRING );
	GameInfo->max_edicts = 1024;	// default value if not specified
	GameInfo->version = 1.0;
	GameInfo->viewheight[0] = 28.0f;
	GameInfo->viewheight[1] = 12.0f;
	GameInfo->sp_inhibite_ents = false;
	
	com.strncpy( GameInfo->gameHint, "Xash3D", MAX_STRING );
	com.strncpy( GameInfo->sp_entity, "info_player_start", MAX_STRING );
	com.strncpy( GameInfo->dm_entity, "info_player_deathmatch", MAX_STRING );
	com.strncpy( GameInfo->ctf_entity, "info_player_ctf", MAX_STRING );
	com.strncpy( GameInfo->coop_entity, "info_player_coop", MAX_STRING );
	com.strncpy( GameInfo->team_entity, "info_player_team", MAX_STRING );
	com.strncpy( GameInfo->startmap, "", MAX_STRING );

	VectorSet( GameInfo->client_mins[0],   0,   0,  0  );
	VectorSet( GameInfo->client_maxs[0],   0,   0,  0  );
	VectorSet( GameInfo->client_mins[1], -16, -16, -36 );
	VectorSet( GameInfo->client_maxs[1],  16,  16,  36 );
	VectorSet( GameInfo->client_mins[2], -32, -32, -32 );
	VectorSet( GameInfo->client_maxs[2],  32,  32,  32 );
	VectorSet( GameInfo->client_mins[3], -16, -16, -18 );
	VectorSet( GameInfo->client_maxs[3],  16,  16,  18 );

	while( script )
	{
		if( !PS_ReadToken( script, SC_ALLOW_NEWLINES, &token ))
			break;

		if( !com.stricmp( token.string, "basedir" ))
		{
			PS_GetString( script, false, fs_path, MAX_STRING );
			if( com.stricmp( fs_path, GameInfo->basedir ) || com.stricmp( fs_path, GameInfo->gamedir ))
				com.strncpy( GameInfo->basedir, fs_path, MAX_STRING );
		}
		else if( !com.stricmp( token.string, "gamedir" ))
		{
			PS_GetString( script, false, fs_path, MAX_STRING );
			if( com.stricmp( fs_path, GameInfo->basedir ) || com.stricmp( fs_path, GameInfo->gamedir ))
				com.strncpy( GameInfo->gamedir, fs_path, MAX_STRING );
		}
		else if( !com.stricmp( token.string, "title" ))
		{
			PS_GetString( script, false, GameInfo->title, sizeof( GameInfo->title ));
		}
		else if( !com.stricmp( token.string, "gameHint" ))
		{
			PS_GetString( script, false, GameInfo->gameHint, sizeof( GameInfo->gameHint ));
		}
		else if( !com.stricmp( token.string, "sp_spawn" ))
		{
			PS_GetString( script, false, GameInfo->sp_entity, sizeof( GameInfo->sp_entity ));
		}
		else if( !com.stricmp( token.string, "dm_spawn" ))
		{
			PS_GetString( script, false, GameInfo->dm_entity, sizeof( GameInfo->dm_entity ));
		}
		else if( !com.stricmp( token.string, "ctf_spawn" ))
		{
			PS_GetString( script, false, GameInfo->ctf_entity, sizeof( GameInfo->ctf_entity ));
		}
		else if( !com.stricmp( token.string, "coop_spawn" ))
		{
			PS_GetString( script, false, GameInfo->coop_entity, sizeof( GameInfo->coop_entity ));
		}
		else if( !com.stricmp( token.string, "team_spawn" ))
		{
			PS_GetString( script, false, GameInfo->team_entity, sizeof( GameInfo->team_entity ));
		}
		else if( !com.stricmp( token.string, "startmap" ))
		{
			PS_GetString( script, false, GameInfo->startmap, sizeof( GameInfo->startmap ));
		}
		else if( !com.stricmp( token.string, "trainmap" ))
		{
			PS_GetString( script, false, GameInfo->trainmap, sizeof( GameInfo->trainmap ));
		}
		else if( !com.stricmp( token.string, "url_info" ))
		{
			PS_GetString( script, false, GameInfo->game_url, sizeof( GameInfo->game_url ));
		}
		else if( !com.stricmp( token.string, "url_update" ))
		{
			PS_GetString( script, false, GameInfo->update_url, sizeof( GameInfo->update_url ));
		}
		else if( !com.stricmp( token.string, "textures_path" ))
		{
			PS_GetString( script, false, GameInfo->texpath, sizeof( GameInfo->texpath ));
		}
		else if( !com.stricmp( token.string, "date" ))
		{
			PS_GetString( script, false, GameInfo->date, sizeof( GameInfo->date ));
		}
		else if( !com.stricmp( token.string, "type" ))
		{
			PS_GetString( script, false, GameInfo->type, sizeof( GameInfo->type ));
		}
		else if( !com.stricmp( token.string, "version" ))
		{
			PS_GetFloat( script, false, &GameInfo->version );
		}
		else if( !com.stricmp( token.string, "size" ))
		{
			PS_ReadToken( script, 0, &token );
			GameInfo->size = com.atoi( token.string );
		}
		else if( !com.stricmp( token.string, "allow_inhibited_entities" ))
		{
			MsgDev( D_INFO, "GameInfo: Q1-like inhibite entities mode enabled\n" );
			GameInfo->sp_inhibite_ents = true;
		}
		else if( !com.stricmp( token.string, "max_edicts" ))
		{
			PS_GetInteger( script, false, &GameInfo->max_edicts );
			GameInfo->max_edicts = bound( 600, GameInfo->max_edicts, 32000 ); // reserve some edicts for tempents
		}
		else if( !com.stricmp( token.string, "viewmode" ))
		{
			PS_ReadToken( script, 0, &token );
			if( !com.stricmp( token.string, "firstperson" ))
				GameInfo->viewmode = 1;
			else if( !com.stricmp( token.string, "thirdperson" ))
				GameInfo->viewmode = 2;
		}
		else if( !com.stricmp( token.string, "gamemode" ))
		{
			PS_ReadToken( script, 0, &token );
			if( !com.stricmp( token.string, "singleplayer_only" ))
				GameInfo->gamemode = 1;
			else if( !com.stricmp( token.string, "multiplayer_only" ))
				GameInfo->gamemode = 2;
		}
		else if( !com.strnicmp( token.string, "hull", 4 ))
		{
			int	hullNum = com.atoi( token.string + 4 );

			if( hullNum < 0 || hullNum > 15 )
			{
				MsgDev( D_ERROR, "FS_ParseGameInfo: Invalid hull number %i. Ignored.\n", hullNum );
				PS_SkipRestOfLine( script ); 
			}
			else
			{
				FS_ParseVector( script, GameInfo->client_mins[hullNum], 3 );
				FS_ParseVector( script, GameInfo->client_maxs[hullNum], 3 );
			}
		}
		else if( !com.strnicmp( token.string, "viewheight", 10 ))
		{
			int	hullNum = com.atoi( token.string + 10 );
			float	value;

			if( hullNum < 0 || hullNum > ( PM_MAXHULLS - 1 ))
			{
				MsgDev( D_ERROR, "FS_ParseGameInfo: Invalid hull number %i. Ignored.\n", hullNum );
				PS_SkipRestOfLine( script ); 
			}
			else
			{
				if( PS_GetFloat( script, false, &value ))
					GameInfo->viewheight[hullNum] = value;
			}
		}
	}

	PS_FreeScript( script );
	return true;
}

/*
================
FS_LoadGameInfo

can be passed null arg
================
*/
void FS_LoadGameInfo( const char *rootfolder )
{
	int	i;

	// lock uplevel of gamedir for read\write
	fs_ext_path = false;

	if( rootfolder ) com.strcpy( gs_basedir, rootfolder );
	MsgDev( D_NOTE, "FS_LoadGameInfo( %s )\n", gs_basedir );

	// clear any old pathes
	FS_ClearSearchPath();

	// validate gamedir
	for( i = 0; i < SI.numgames; i++ )
	{
		if( !com.stricmp( SI.games[i]->gamefolder, gs_basedir ))
			break;
	}

	if( i == SI.numgames )
		Sys_Break( "Couldn't find game directory '%s'\n", gs_basedir );

	SI.GameInfo = SI.games[i];
	FS_Rescan(); // create new filesystem
}

/*
================
FS_Init
================
*/
void FS_Init( void )
{
	stringlist_t	dirs;
	bool		hasDefaultDir = false;
	int		i;
	
	FS_InitMemory();

	FS_AddGameDirectory( "bin/", FS_STATIC_PATH ); // execute system config

	Cmd_AddCommand( "fs_rescan", FS_Rescan_f, "rescan filesystem search pathes" );
	Cmd_AddCommand( "fs_path", FS_Path_f, "show filesystem search pathes" );
	Cmd_AddCommand( "fs_clearpaths", FS_ClearPaths_f, "clear filesystem search pathes" );
	fs_wadsupport = Cvar_Get( "fs_wadsupport", "0", CVAR_SYSTEMINFO, "enable wad-archive support" );
	fs_defaultdir = Cvar_Get( "fs_defaultdir", "tmpQuArK", CVAR_SYSTEMINFO, "user-game default directory" );

	Cbuf_ExecuteText( EXEC_NOW, "systemcfg\n" );
	Cbuf_Execute(); // apply system cvars immediately

	// ignore commandlineoption "-game" for other stuff
	if( Sys.app_name == HOST_NORMAL || Sys.app_name == HOST_DEDICATED || Sys.app_name == HOST_BSPLIB )
	{
		stringlistinit( &dirs );
		listdirectory( &dirs, "./" );
		stringlistsort( &dirs );
		SI.numgames = 0;
	
		if( !FS_GetParmFromCmdLine( "-game", gs_basedir, sizeof( gs_basedir )))
		{
			if( Sys.app_name == HOST_BSPLIB )
				com.strcpy( gs_basedir, fs_defaultdir->string );
			else if( Sys_GetModuleName( gs_basedir, MAX_SYSPATH ));
			else com.strcpy( gs_basedir, fs_defaultdir->string ); // default dir

			FS_ApplyBaseDir();	// check for associated folders
		}

		// checked nasty path: "bin" it's a reserved word
		if( FS_CheckNastyPath( gs_basedir, true ) || !com.stricmp( "bin", gs_basedir ))
		{
			MsgDev( D_ERROR, "FS_Init: invalid game directory \"%s\"\n", gs_basedir );		
			com.strcpy( gs_basedir, fs_defaultdir->string ); // default dir
		}

		// validate directories
		for( i = 0; i < dirs.numstrings; i++ )
		{
			if( !com.stricmp( fs_defaultdir->string, dirs.strings[i] ))
				hasDefaultDir = true;
			if( !com.stricmp( gs_basedir, dirs.strings[i] ))
				break;
		}

		if( i == dirs.numstrings )
		{ 
			MsgDev( D_INFO, "FS_Init: game directory \"%s\" not exist\n", gs_basedir );		
			if( hasDefaultDir ) com.strcpy( gs_basedir, fs_defaultdir->string ); // default dir
		}

		// build list of game directories here
		FS_AddGameDirectory( "./", 0 );
		for( i = 0; i < dirs.numstrings; i++ )
		{
			const char	*ext = FS_FileExtension( dirs.strings[i] );

			if( com.stricmp( ext, "" ) || (!com.stricmp( dirs.strings[i], ".." ) && !fs_ext_path))
				continue;

			if( !SI.games[SI.numgames] )
				SI.games[SI.numgames] = (gameinfo_t *)Mem_Alloc( fs_mempool, sizeof( gameinfo_t ));
			if( FS_ParseGameInfo( dirs.strings[i], SI.games[SI.numgames] ))
				SI.numgames++; // added
		}
		stringlistfreecontents( &dirs );
	}	

	// enable explicit wad support for some tools
	switch( Sys.app_name )
	{
	case HOST_WADLIB:
	case HOST_RIPPER:
	case HOST_XIMAGE:
		fs_use_wads = true;
		break;
	default:
		fs_use_wads = false;
		break;
	}

	FS_UpdateSysInfo();
	MsgDev( D_INFO, "FS_Root: %s\n", sys_rootdir );
	MsgDev( D_NOTE, "FS_Init: done\n" );
}

void FS_InitRootDir( char *path )
{
	char	szTemp[4096];

	FS_InitMemory();

	// just set cwd
	GetModuleFileName( NULL, szTemp, MAX_SYSPATH );
	FS_ExtractFilePath( szTemp, szTemp );	
	SetCurrentDirectory ( szTemp );

	// use extended pathname
	fs_ext_path = true;

	FS_ClearSearchPath();
	FS_AddGameHierarchy( path, FS_STATIC_PATH );
}

bool FS_GetParmFromCmdLine( char *parm, char *out, size_t size )
{
	int argc = FS_CheckParm( parm );

	if(!argc) return false;
	if(!out) return false;	
	if(!fs_argv[argc + 1]) return false;

	com.strncpy( out, fs_argv[argc+1], size );
	return true;
}

void FS_AllowDirectPaths( bool enable )
{
	fs_ext_path = enable;
}

/*
============
FS_WriteVariables

Appends lines containing "set variable value" for all variables
with the archive flag set to true.
============
*/
static void FS_WriteCvar( const char *name, const char *string, const char *desc, void *f )
{
	if( !desc ) return; // ignore cvars without description (fantom variables)
	FS_Printf( f, "setc %s \"%s\"\n", name, string );
}

void FS_WriteVariables( file_t *f )
{
	Cvar_LookupVars( CVAR_SYSTEMINFO, NULL, f, FS_WriteCvar ); 
}

void FS_UpdateConfig( void )
{
	file_t	*f;

	if( Sys.app_state == SYS_ERROR ) return;
	// only normal and bsplib instance can change config.rc
	if( Sys.app_name != HOST_NORMAL && Sys.app_name != HOST_BSPLIB ) return;
	com.strncpy( fs_gamedir, "bin", sizeof( fs_gamedir ));	// set write directory for system config
	f = FS_Open( "config.rc", "w" );
	if( f )
	{
		FS_Printf (f, "//=======================================================================\n");
		FS_Printf (f, "//\t\t\tCopyright XashXT Group %s ©\n", com.timestamp( TIME_YEAR_ONLY ));
		FS_Printf (f, "//\t\t      config.rc - archive of system cvars\n");
		FS_Printf (f, "//=======================================================================\n");
		FS_WriteVariables( f );
		FS_Close (f);	
	}                                                
	else MsgDev( D_ERROR, "can't update config.rc.\n" );
}

/*
================
FS_Shutdown
================
*/
void FS_Shutdown( void )
{
	int	i;

	// release gamedirs
	for( i = 0; i < SI.numgames; i++ )
		if( SI.games[i] ) Mem_Free( SI.games[i] );

	Mem_Set( &SI, 0, sizeof( SI ));

	FS_ClearSearchPath();		// release all wad files too
	FS_UpdateEnvironmentVariables(); 	// merge working directory
	FS_UpdateConfig();
	Mem_FreePool( &fs_mempool );
}

/*
====================
FS_SysFileTime

Internal function used to determine filetime
====================
*/
static long FS_SysFileTime( const char *filename )
{
	struct stat buf;
	
	if( stat( filename, &buf ) == -1 )
		return -1;

	return buf.st_mtime;
}

/*
====================
FS_SysOpen

Internal function used to create a file_t and open the relevant non-packed file on disk
====================
*/
static file_t* FS_SysOpen( const char* filepath, const char* mode )
{
	file_t	*file;
	int	mod, opt;
	uint	ind;

	// Parse the mode string
	switch( mode[0] )
	{
		case 'r':
			mod = O_RDONLY;
			opt = 0;
			break;
		case 'w':
			mod = O_WRONLY;
			opt = O_CREAT | O_TRUNC;
			break;
		case 'a':
			mod = O_WRONLY;
			opt = O_CREAT | O_APPEND;
			break;
		default:
			MsgDev( D_ERROR, "FS_SysOpen(%s, %s): invalid mode\n", filepath, mode );
			return NULL;
	}
	for( ind = 1; mode[ind] != '\0'; ind++ )
	{
		switch( mode[ind] )
		{
			case '+':
				mod = O_RDWR;
				break;
			case 'b':
				opt |= O_BINARY;
				break;
			default:
				MsgDev( D_ERROR, "FS_SysOpen: %s: unknown char in mode (%c)\n", filepath, mode, mode[ind] );
				break;
		}
	}

	file = (file_t *)Mem_Alloc( fs_mempool, sizeof( *file ));
	file->filetime = FS_SysFileTime( filepath );
	file->ungetc = EOF;

	file->handle = open( filepath, mod|opt, 0666 );
	if( file->handle < 0 )
	{
		Mem_Free( file );
		return NULL;
	}
	file->real_length = lseek( file->handle, 0, SEEK_END );

	// For files opened in append mode, we start at the end of the file
	if( mod & O_APPEND ) file->position = file->real_length;
	else lseek( file->handle, 0, SEEK_SET );

	return file;
}


/*
===========
FS_OpenPackedFile

Open a packed file using its package file descriptor
===========
*/
file_t *FS_OpenPackedFile( pack_t *pack, int pack_ind )
{
	packfile_t	*pfile;
	int		dup_handle;
	file_t		*file;

	pfile = &pack->files[pack_ind];

	// if we don't have the true offset, get it now
	if( !( pfile->flags & PACKFILE_FLAG_TRUEOFFS ))
		if( !PK3_GetTrueFileOffset( pfile, pack ))
			return NULL;

	if( lseek( pack->handle, pfile->offset, SEEK_SET ) == -1 )
	{
		Msg( "FS_OpenPackedFile: can't lseek to %s in %s (offset: %d)\n", pfile->name, pack->filename, pfile->offset );
		return NULL;
	}

	dup_handle = dup( pack->handle );

	if( dup_handle < 0 )
	{
		Msg( "FS_OpenPackedFile: can't dup package's handle (pack: %s)\n", pack->filename );
		return NULL;
	}

	file = (file_t *)Mem_Alloc( fs_mempool, sizeof( *file ));
	Mem_Set( file, 0, sizeof( *file ));
	file->handle = dup_handle;
	file->flags = FILE_FLAG_PACKED;
	file->real_length = pfile->realsize;
	file->offset = pfile->offset;
	file->position = 0;
	file->ungetc = EOF;

	if( pfile->flags & PACKFILE_FLAG_DEFLATED )
	{
		ztoolkit_t	*ztk;

		file->flags |= FILE_FLAG_DEFLATED;

		// We need some more variables
		ztk = (ztoolkit_t *)Mem_Alloc( fs_mempool, sizeof( *ztk ));
		ztk->comp_length = pfile->packsize;

		// Initialize zlib stream
		ztk->zstream.next_in = ztk->input;
		ztk->zstream.avail_in = 0;

		if( inflateInit2( &ztk->zstream, -MAX_WBITS ) != Z_OK )
		{
			Msg( "FS_OpenPackedFile: inflate init error (file: %s)\n", pfile->name );
			close( dup_handle );
			Mem_Free( file );
			return NULL;
		}

		ztk->zstream.next_out = file->buff;
		ztk->zstream.avail_out = sizeof( file->buff );
		file->ztk = ztk;
	}
	return file;
}

/*
==================
FS_SysFileExists

Look for a file in the filesystem only
==================
*/
bool FS_SysFileExists( const char *path )
{
	int desc;
     
	desc = open( path, O_RDONLY|O_BINARY );

	if( desc < 0 ) return false;
	close( desc );
	return true;
}

/*
====================
FS_FindFile

Look for a file in the packages and in the filesystem

Return the searchpath where the file was found (or NULL)
and the file index in the package if relevant
====================
*/
static searchpath_t *FS_FindFile( const char *name, int* index, bool quiet, bool gamedironly )
{
	searchpath_t	*search;
	char		*pEnvPath;
	pack_t		*pak;

	// search through the path, one element at a time
	for( search = fs_searchpaths; search; search = search->next )
	{
		if( gamedironly & !( search->flags & FS_GAMEDIR_PATH ))
			continue;

		// is the element a pak file?
		if( search->pack )
		{
			int left, right, middle;

			pak = search->pack;

			// look for the file (binary search)
			left = 0;
			right = pak->numfiles - 1;
			while( left <= right )
			{
				int diff;

				middle = (left + right) / 2;
				diff = com.stricmp( pak->files[middle].name, name );

				// Found it
				if( !diff )
				{
					if( !quiet ) MsgDev( D_INFO, "FS_FindFile: %s in %s\n", pak->files[middle].name, pak->filename );
					if( index ) *index = middle;
					return search;
				}

				// if we're too far in the list
				if( diff > 0 )
					right = middle - 1;
				else left = middle + 1;
			}
		}
		else if( search->wad )
		{
			dlumpinfo_t	*lump;	
			char		type = W_TypeFromExt( name );
			bool		anywadname = true;
			string		wadname, wadfolder;
			string		shortname;

			// quick reject by filetype
			if( type == TYPE_NONE ) continue;
			FS_ExtractFilePath( name, wadname );
			wadfolder[0] = '\0';

			if( com.strlen( wadname ))
			{
				FS_FileBase( wadname, wadname );
				com.strncpy( wadfolder, wadname, sizeof( wadfolder ));
				FS_DefaultExtension( wadname, ".wad" );
				anywadname = false;
			}

			// quick reject by wadname
			if( !anywadname && com.stricmp( wadname, search->wad->filename ))
				continue;

			// NOTE: we can't using long names for wad,
			// because we using original wad names[16];
			W_FileBase( name, shortname );

			// can't using binary search: wad lumps never sorting by alphabetical
			lump = W_FindLump( search->wad, shortname, type );
			if( lump )
			{
				if( !quiet ) MsgDev( D_INFO, "FS_FindFile: %s in %s\n", lump->name, search->wad->filename );
				if( index ) *index = lump - search->wad->lumps;
					return search;
			}
		}
		else
		{
			char	netpath[MAX_SYSPATH];
			com.sprintf( netpath, "%s%s", search->filename, name );
			if( FS_SysFileExists( netpath ))
			{
				if( !quiet ) MsgDev( D_INFO, "FS_FindFile: %s\n", netpath );
				if( index != NULL ) *index = -1;
				return search;
			}
		}
	}

	if( fs_ext_path && ( pEnvPath = getenv( "Path" )))
	{
		char	netpath[MAX_SYSPATH];

		// clear searchpath
		search = &fs_directpath;
		Mem_Set( search, 0, sizeof( searchpath_t ));

		// search for environment path
		while( pEnvPath )
		{
			char *end = com.strchr( pEnvPath, ';' );
			if( !end ) break;
			com.strncpy( search->filename, pEnvPath, (end - pEnvPath) + 1 );
			com.strcat( search->filename, "\\" );
			com.snprintf( netpath, MAX_SYSPATH, "%s%s", search->filename, name );
			if( FS_SysFileExists( netpath ))
			{
				if( !quiet ) MsgDev( D_INFO, "FS_FindFile: %s\n", netpath );
				if( index != NULL ) *index = -1;
				return search;
			}
			pEnvPath += (end - pEnvPath) + 1; // move pointer
		}
	}

	if( !quiet ) MsgDev( D_WARN, "FS_FindFile: can't find %s\n", name );
	if( index != NULL ) *index = -1;

	return NULL;
}


/*
===========
FS_OpenReadFile

Look for a file in the search paths and open it in read-only mode
===========
*/
file_t *FS_OpenReadFile( const char *filename, const char *mode, bool quiet )
{
	searchpath_t	*search;
	bool		gamedironly = false;
	int		pack_ind;

	if( filename[0] == '†' )
	{
		filename++;
		gamedironly = true;
	}

	search = FS_FindFile( filename, &pack_ind, quiet, gamedironly );

	// not found?
	if( search == NULL )
		return NULL; 

	if( search->pack )
		return FS_OpenPackedFile( search->pack, pack_ind );
	else if( search->wad )
		return NULL; // let W_LoadFile get lump correctly
	else if( pack_ind < 0 )
	{
		// found in the filesystem?
		char	path [MAX_SYSPATH];
		com.sprintf( path, "%s%s", search->filename, filename );
		return FS_SysOpen( path, mode );
	} 
	return NULL;
}

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

MAIN PUBLIC FUNCTIONS

=============================================================================
*/
/*
====================
FS_Open

Open a file. The syntax is the same as fopen
====================
*/
file_t* _FS_Open( const char* filepath, const char* mode, bool quiet )
{
	if( FS_CheckNastyPath( filepath, false ))
	{
		MsgDev( D_NOTE, "FS_Open: (\"%s\", \"%s\"): nasty filename rejected\n", filepath, mode );
		return NULL;
	}

	// if the file is opened in "write", "append", or "read/write" mode
	if( mode[0] == 'w' || mode[0] == 'a' || com.strchr( mode, '+' ))
	{
		char real_path[MAX_SYSPATH];

		// open the file on disk directly
		com.sprintf( real_path, "%s/%s", fs_gamedir, filepath );
		FS_CreatePath( real_path );// Create directories up to the file
		return FS_SysOpen( real_path, mode );
	}
	
	// else, we look at the various search paths and open the file in read-only mode
	return FS_OpenReadFile( filepath, mode, quiet );
}

file_t* FS_Open( const char* filepath, const char* mode )
{
	return _FS_Open( filepath, mode, true );
}

/*
====================
FS_Close

Close a file
====================
*/
int FS_Close( file_t* file )
{
	if( close( file->handle ))
		return EOF;

	if( file->ztk )
	{
		inflateEnd( &file->ztk->zstream );
		Mem_Free( file->ztk );
	}
	Mem_Free( file );
	return 0;
}


/*
====================
FS_Write

Write "datasize" bytes into a file
====================
*/
fs_offset_t FS_Write( file_t* file, const void* data, size_t datasize )
{
	fs_offset_t result;

	if( !file ) return 0;

	// if necessary, seek to the exact file position we're supposed to be
	if( file->buff_ind != file->buff_len )
		lseek (file->handle, file->buff_ind - file->buff_len, SEEK_CUR);

	// Purge cached data
	FS_Purge (file);

	// Write the buffer and update the position
	result = write (file->handle, data, (fs_offset_t)datasize);
	file->position = lseek (file->handle, 0, SEEK_CUR);
	if (file->real_length < file->position)
		file->real_length = file->position;

	if( result < 0 ) return 0;
	return result;
}


/*
====================
FS_Read

Read up to "buffersize" bytes from a file
====================
*/
fs_offset_t FS_Read (file_t* file, void* buffer, size_t buffersize)
{
	fs_offset_t count, done;

	// nothing to copy
	if (buffersize == 0) return 1;

	// Get rid of the ungetc character
	if (file->ungetc != EOF)
	{
		((char*)buffer)[0] = file->ungetc;
		buffersize--;
		file->ungetc = EOF;
		done = 1;
	}
	else done = 0;

	// First, we copy as many bytes as we can from "buff"
	if (file->buff_ind < file->buff_len)
	{
		count = file->buff_len - file->buff_ind;

		done += ((fs_offset_t)buffersize > count) ? count : (fs_offset_t)buffersize;
		Mem_Copy (buffer, &file->buff[file->buff_ind], done);
		file->buff_ind += done;

		buffersize -= done;
		if (buffersize == 0) return done;
	}

	// NOTE: at this point, the read buffer is always empty

	// If the file isn't compressed
	if (! (file->flags & FILE_FLAG_DEFLATED))
	{
		fs_offset_t nb;

		// We must take care to not read after the end of the file
		count = file->real_length - file->position;

		// If we have a lot of data to get, put them directly into "buffer"
		if (buffersize > sizeof (file->buff) / 2)
		{
			if (count > (fs_offset_t)buffersize)
				count = (fs_offset_t)buffersize;
			lseek (file->handle, file->offset + file->position, SEEK_SET);
			nb = read (file->handle, &((unsigned char*)buffer)[done], count);
			if (nb > 0)
			{
				done += nb;
				file->position += nb;
				// Purge cached data
				FS_Purge (file);
			}
		}
		else
		{
			if (count > (fs_offset_t)sizeof (file->buff))
				count = (fs_offset_t)sizeof (file->buff);
			lseek (file->handle, file->offset + file->position, SEEK_SET);
			nb = read (file->handle, file->buff, count);
			if (nb > 0)
			{
				file->buff_len = nb;
				file->position += nb;

				// Copy the requested data in "buffer" (as much as we can)
				count = (fs_offset_t)buffersize > file->buff_len ? file->buff_len : (fs_offset_t)buffersize;
				Mem_Copy (&((unsigned char*)buffer)[done], file->buff, count);
				file->buff_ind = count;
				done += count;
			}
		}

		return done;
	}

	// If the file is compressed, it's more complicated...
	// We cycle through a few operations until we have read enough data
	while (buffersize > 0)
	{
		ztoolkit_t *ztk = file->ztk;
		int error;

		// NOTE: at this point, the read buffer is always empty

		// If "input" is also empty, we need to refill it
		if (ztk->in_ind == ztk->in_len)
		{
			// If we are at the end of the file
			if (file->position == file->real_length)
				return done;

			count = (fs_offset_t)(ztk->comp_length - ztk->in_position);
			if (count > (fs_offset_t)sizeof (ztk->input))
				count = (fs_offset_t)sizeof (ztk->input);
			lseek (file->handle, file->offset + (fs_offset_t)ztk->in_position, SEEK_SET);
			if (read (file->handle, ztk->input, count) != count)
			{
				Msg("FS_Read: unexpected end of file\n");
				break;
			}
			ztk->in_ind = 0;
			ztk->in_len = count;
			ztk->in_position += count;
		}

		ztk->zstream.next_in = &ztk->input[ztk->in_ind];
		ztk->zstream.avail_in = (uint)(ztk->in_len - ztk->in_ind);

		// Now that we are sure we have compressed data available, we need to determine
		// if it's better to inflate it in "file->buff" or directly in "buffer"

		// Inflate the data in "file->buff"
		if (buffersize < sizeof (file->buff) / 2)
		{
			ztk->zstream.next_out = file->buff;
			ztk->zstream.avail_out = sizeof (file->buff);
			error = inflate (&ztk->zstream, Z_SYNC_FLUSH);
			if (error != Z_OK && error != Z_STREAM_END)
			{
				Msg("FS_Read: Can't inflate file: %s\n", ztk->zstream.msg );
				break;
			}
			ztk->in_ind = ztk->in_len - ztk->zstream.avail_in;

			file->buff_len = (fs_offset_t)sizeof (file->buff) - ztk->zstream.avail_out;
			file->position += file->buff_len;

			// Copy the requested data in "buffer" (as much as we can)
			count = (fs_offset_t)buffersize > file->buff_len ? file->buff_len : (fs_offset_t)buffersize;
			Mem_Copy (&((unsigned char*)buffer)[done], file->buff, count);
			file->buff_ind = count;
		}
		else // Else, we inflate directly in "buffer"
		{
			ztk->zstream.next_out = &((unsigned char*)buffer)[done];
			ztk->zstream.avail_out = (unsigned int)buffersize;
			error = inflate (&ztk->zstream, Z_SYNC_FLUSH);
			if (error != Z_OK && error != Z_STREAM_END)
			{
				Msg("FS_Read: Can't inflate file: %s\n", ztk->zstream.msg);
				break;
			}
			ztk->in_ind = ztk->in_len - ztk->zstream.avail_in;

			// How much data did it inflate?
			count = (fs_offset_t)(buffersize - ztk->zstream.avail_out);
			file->position += count;

			// Purge cached data
			FS_Purge (file);
		}
		done += count;
		buffersize -= count;
	}

	return done;
}


/*
====================
FS_Print

Print a string into a file
====================
*/
int FS_Print( file_t* file, const char *msg )
{
	return FS_Write( file, msg, com.strlen( msg ));
}

/*
====================
FS_Printf

Print a string into a file
====================
*/
int FS_Printf(file_t* file, const char* format, ...)
{
	int result;
	va_list args;

	va_start (args, format);
	result = FS_VPrintf (file, format, args);
	va_end (args);

	return result;
}


/*
====================
FS_VPrintf

Print a string into a file
====================
*/
int FS_VPrintf( file_t* file, const char* format, va_list ap )
{
	int		len;
	fs_offset_t	buff_size = MAX_MSGLEN;
	char		*tempbuff;

	if( !file ) return 0;

	while( 1 )
	{
		tempbuff = (char *)Mem_Alloc( fs_mempool, buff_size );
		len = com.vsprintf( tempbuff, format, ap );
		if( len >= 0 && len < buff_size ) break;
		Mem_Free( tempbuff );
		buff_size *= 2;
	}

	len = write( file->handle, tempbuff, len );
	Mem_Free( tempbuff );

	return len;
}

/*
====================
FS_Getc

Get the next character of a file
====================
*/
int FS_Getc( file_t* file )
{
	char c;

	if (FS_Read (file, &c, 1) != 1)
		return EOF;

	return c;
}


/*
====================
FS_UnGetc

Put a character back into the read buffer (only supports one character!)
====================
*/
int FS_UnGetc( file_t* file, byte c )
{
	// If there's already a character waiting to be read
	if (file->ungetc != EOF)
		return EOF;

	file->ungetc = c;
	return c;
}

int FS_Gets( file_t* file, byte *string, size_t bufsize )
{
	int c, end = 0;

	while( 1 )
	{
		c = FS_Getc( file );
		if( c == '\r' || c == '\n' || c < 0 )
			break;
		if( end < bufsize - 1 )
			string[end++] = c;
	}
	string[end] = 0;

	// remove \n following \r
	if( c == '\r' )
	{
		c = FS_Getc( file );
		if( c != '\n' ) FS_UnGetc( file, (byte)c );
	}

	return c;
}

/*
====================
FS_Seek

Move the position index in a file
====================
*/
int FS_Seek (file_t* file, fs_offset_t offset, int whence)
{
	ztoolkit_t *ztk;
	unsigned char* buffer;
	fs_offset_t buffersize;

	// Compute the file offset
	switch (whence)
	{
		case SEEK_CUR:
			offset += file->position - file->buff_len + file->buff_ind;
			break;
		case SEEK_SET:
			break;
		case SEEK_END:
			offset += file->real_length;
			break;

		default: 
			return -1;
	}
	
	if (offset < 0 || offset > (long)file->real_length) return -1;

	// If we have the data in our read buffer, we don't need to actually seek
	if (file->position - file->buff_len <= offset && offset <= file->position)
	{
		file->buff_ind = offset + file->buff_len - file->position;
		return 0;
	}

	// Purge cached data
	FS_Purge (file);

	// Unpacked or uncompressed files can seek directly
	if (! (file->flags & FILE_FLAG_DEFLATED))
	{
		if (lseek (file->handle, file->offset + offset, SEEK_SET) == -1)
			return -1;
		file->position = offset;
		return 0;
	}

	// Seeking in compressed files is more a hack than anything else,
	// but we need to support it, so here we go.
	ztk = file->ztk;

	// If we have to go back in the file, we need to restart from the beginning
	if (offset <= file->position)
	{
		ztk->in_ind = 0;
		ztk->in_len = 0;
		ztk->in_position = 0;
		file->position = 0;
		lseek (file->handle, file->offset, SEEK_SET);

		// Reset the Zlib stream
		ztk->zstream.next_in = ztk->input;
		ztk->zstream.avail_in = 0;
		inflateReset (&ztk->zstream);
	}

	// We need a big buffer to force inflating into it directly
	buffersize = 2 * sizeof (file->buff);
	buffer = (byte *)Mem_Alloc( fs_mempool, buffersize );

	// Skip all data until we reach the requested offset
	while (offset > file->position)
	{
		fs_offset_t diff = offset - file->position;
		fs_offset_t count, len;

		count = (diff > buffersize) ? buffersize : diff;
		len = FS_Read (file, buffer, count);
		if (len != count)
		{
			Mem_Free (buffer);
			return -1;
		}
	}
	Mem_Free (buffer);
	return 0;
}


/*
====================
FS_Tell

Give the current position in a file
====================
*/
fs_offset_t FS_Tell( file_t* file )
{
	if( !file ) return 0;
	return file->position - file->buff_len + file->buff_ind;
}

/*
====================
FS_Eof

indicates at reached end of file
====================
*/
bool FS_Eof( file_t* file )
{
	if( !file ) return true;
	return (file->position == file->real_length) ? true : false;
}

/*
====================
FS_Purge

Erases any buffered input or output data
====================
*/
void FS_Purge( file_t* file )
{
	file->buff_len = 0;
	file->buff_ind = 0;
	file->ungetc = EOF;
}


/*
============
FS_LoadFile

Filename are relative to the xash directory.
Always appends a 0 byte.
============
*/
byte *FS_LoadFile( const char *path, fs_offset_t *filesizeptr )
{
	file_t	*file;
	byte	*buf = NULL;
	fs_offset_t filesize = 0;
	const char *ext = FS_FileExtension( path );

	file = _FS_Open( path, "rb", true );
	if( file )
	{
		filesize = file->real_length;
		buf = (byte *)Mem_Alloc( fs_mempool, filesize + 1 );
		buf[filesize] = '\0';
		FS_Read( file, buf, filesize );
		FS_Close( file );
	}
	else buf = W_LoadFile( path, &filesize );

	if( filesizeptr ) *filesizeptr = filesize;
	return buf;
}


/*
============
FS_WriteFile

The filename will be prefixed by the current game directory
============
*/
bool FS_WriteFile( const char *filename, const void *data, fs_offset_t len )
{
	file_t *file;

	file = _FS_Open( filename, "wb", false );
	if (!file)
	{
		MsgDev( D_ERROR, "FS_WriteFile: failed on %s\n", filename);
		return false;
	}

	FS_Write (file, data, len);
	FS_Close (file);
	return true;
}

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

OTHERS PUBLIC FUNCTIONS

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

/*
============
FS_StripExtension
============
*/
void FS_StripExtension (char *path)
{
	size_t	length;

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


/*
==================
FS_DefaultExtension
==================
*/
void FS_DefaultExtension( char *path, const char *extension )
{
	const char *src;

	// if path doesn't have a .EXT, append extension
	// (extension should include the .)
	src = path + com.strlen( path ) - 1;

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

/*
==================
FS_FileExists

Look for a file in the packages and in the filesystem
==================
*/
bool FS_FileExists( const char *filename )
{
	bool	gamedironly = false;

	if( filename[0] == '†' )
	{
		filename++;
		gamedironly = true;
	}

	if( FS_FindFile( filename, NULL, true, gamedironly ))
		return true;
	return false;
}

/*
==================
FS_FindLibrary

search for library, assume index is valid
only for internal use
==================
*/
dll_user_t *FS_FindLibrary( const char *dllname, bool directpath )
{
	string		dllpath;
	searchpath_t	*search;
	dll_user_t	*hInst;
	int		index;

	// check for bad exports
	if( !dllname || !*dllname )
		return NULL;

	fs_ext_path = directpath;

	if( !directpath )
		com.snprintf( dllpath, sizeof( dllpath ), "bin/%s", dllname );
	else com.strncpy( dllpath, dllname, sizeof( dllpath ));
	FS_DefaultExtension( dllpath, ".dll" );	// trying to apply if forget

	search = FS_FindFile( dllpath, &index, true, false );
	if( !search )
	{
		fs_ext_path = false;
		if( directpath ) return NULL;	// direct paths fails here

		// trying check also 'bin' folder for indirect paths
		com.strncpy( dllpath, dllname, sizeof( dllpath ));
		search = FS_FindFile( dllpath, &index, true, false );
		if( !search ) return NULL;	// unable to find
	}

	// all done, create dll_user_t struct
	hInst = Mem_Alloc( Sys.basepool, sizeof( dll_user_t ));	

	// save dllname for debug purposes
	com.strncpy( hInst->dllName, dllname, sizeof( hInst->dllName ));

	// shortPath is used for LibraryLoadSymbols only
	com.strncpy( hInst->shortPath, dllpath, sizeof( hInst->shortPath ));

	if( index < 0 )
	{
		com.snprintf( hInst->fullPath, sizeof( hInst->fullPath ), "%s%s", search->filename, dllpath );
		hInst->custom_loader = false;	// we can loading from disk and use normal debugging
	}
	else
	{
		com.strncpy( hInst->fullPath, dllpath, sizeof( hInst->fullPath ));
		hInst->custom_loader = true;	// loading from pack or wad - for release, debug don't working
	}
	fs_ext_path = false; // always reset direct paths
		
	return hInst;
}

/*
==================
FS_FileSize

return size of file in bytes
==================
*/
fs_offset_t FS_FileSize (const char *filename)
{
	file_t	*fp;
	int	length = 0;
	
	fp = _FS_Open( filename, "rb", true );

	if( fp )
	{
		// it exists
		FS_Seek( fp, 0, SEEK_END );
		length = FS_Tell( fp );
		FS_Close( fp );
	}
	return length;
}

/*
==================
FS_FileTime

return time of creation file in seconds
==================
*/
fs_offset_t FS_FileTime( const char *filename )
{
	searchpath_t	*search;
	int		pack_ind;
	
	search = FS_FindFile( filename, &pack_ind, true, false );
	if( !search ) return -1; // doesn't exist

	if( search->pack ) // grab pack filetime
		return search->pack->filetime;
	else if( search->wad ) // grab wad filetime
		return search->wad->filetime;
	else if( pack_ind < 0 )
	{
		// found in the filesystem?
		char	path [MAX_SYSPATH];

		com.sprintf( path, "%s%s", search->filename, filename );
		return FS_SysFileTime( path );
	}
	return -1; // doesn't exist
}

/*
==================
FS_Rename

rename specified file from gamefolder
==================
*/
bool FS_Rename( const char *oldname, const char *newname )
{
	char	oldpath[MAX_SYSPATH], newpath[MAX_SYSPATH];
	bool	iRet;

	if( !oldname || !newname || !*oldname || !*newname )
		return false;

	com_snprintf( oldpath, sizeof( oldpath ), "%s/%s", fs_gamedir, oldname );
	com_snprintf( newpath, sizeof( newpath ), "%s/%s", fs_gamedir, newname );

	iRet = rename( oldpath, newpath );

	return iRet;
}

/*
==================
FS_Delete

delete specified file from gamefolder
==================
*/
bool FS_Delete( const char *path )
{
	char	real_path[MAX_SYSPATH];
	bool	iRet;

	if( !path || !*path )
		return false;

	com_snprintf( real_path, sizeof( real_path ), "%s/%s", fs_gamedir, path );
	iRet = remove( real_path );

	return iRet;
}

/*
===========
FS_Search

Allocate and fill a search structure with information on matching filenames.
===========
*/
static search_t *_FS_Search( const char *pattern, int caseinsensitive, int quiet )
{
	search_t		*search = NULL;
	searchpath_t	*searchpath;
	pack_t		*pak;
	wfile_t		*wad;
	bool		gamedironly = false;
	int		i, basepathlength, numfiles, numchars;
	int		resultlistindex, dirlistindex;
	const char	*slash, *backslash, *colon, *separator;
	string		netpath, temp;
	stringlist_t	resultlist;
	stringlist_t	dirlist;
	char		*basepath;

	for( i = 0; pattern[i] == '.' || pattern[i] == ':' || pattern[i] == '/' || pattern[i] == '\\'; i++ );

	if( i > 0 )
	{
		MsgDev( D_INFO, "FS_Search: don't use punctuation at the beginning of a search pattern!\n");
		return NULL;
	}

	if( pattern[0] == '†' )
	{
		gamedironly = true;
		pattern++; // ignore this symbol
	}

	stringlistinit( &resultlist );
	stringlistinit( &dirlist );
	slash = com.strrchr( pattern, '/' );
	backslash = com.strrchr( pattern, '\\' );
	colon = com.strrchr( pattern, ':' );
	separator = max( slash, backslash );
	separator = max( separator, colon );
	basepathlength = separator ? (separator + 1 - pattern) : 0;
	basepath = Mem_Alloc( fs_mempool, basepathlength + 1 );
	if( basepathlength ) Mem_Copy( basepath, pattern, basepathlength );
	basepath[basepathlength] = 0;

	// search through the path, one element at a time
	for( searchpath = fs_searchpaths; searchpath; searchpath = searchpath->next )
	{
		if( gamedironly && !( searchpath->flags & FS_GAMEDIR_PATH ))
			continue;

		// is the element a pak file?
		if( searchpath->pack )
		{
			// look through all the pak file elements
			pak = searchpath->pack;
			for( i = 0; i < pak->numfiles; i++ )
			{
				com.strncpy( temp, pak->files[i].name, sizeof( temp ));
				while( temp[0] )
				{
					if( matchpattern( temp, (char *)pattern, true ))
					{
						for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
						{
							if( !com.strcmp( resultlist.strings[resultlistindex], temp ))
								break;
						}
						if( resultlistindex == resultlist.numstrings )
						{
							stringlistappend( &resultlist, temp );
							if( !quiet ) MsgDev( D_INFO, "SearchPackFile: %s : %s\n", pak->filename, temp );
						}
					}
					// strip off one path element at a time until empty
					// this way directories are added to the listing if they match the pattern
					slash = com.strrchr( temp, '/' );
					backslash = com.strrchr( temp, '\\' );
					colon = com.strrchr( temp, ':' );
					separator = temp;
					if( separator < slash )
						separator = slash;
					if( separator < backslash )
						separator = backslash;
					if( separator < colon )
						separator = colon;
					*((char *)separator) = 0;
				}
			}
		}
		else if( searchpath->wad )
		{
			string	wadpattern, wadname, temp2;
			char	type = W_TypeFromExt( pattern );
			bool	anywadname = true;
			string	wadfolder;

			// quick reject by filetype
			if( type == TYPE_NONE ) continue;
			FS_ExtractFilePath( pattern, wadname );
			FS_FileBase( pattern, wadpattern );
			wadfolder[0] = '\0';

			if( com.strlen( wadname ))
			{
				FS_FileBase( wadname, wadname );
				com.strncpy( wadfolder, wadname, sizeof( wadfolder ));
				FS_DefaultExtension( wadname, ".wad" );
				anywadname = false;
			}

			// quick reject by wadname
			if( !anywadname && com.stricmp( wadname, searchpath->wad->filename ))
				continue;

			// look through all the wad file elements
			wad = searchpath->wad;
			for( i = 0; i < wad->numlumps; i++ )
			{
				// if type not matching, we already no chance ...
				if( type != TYPE_ANY && wad->lumps[i].type != type )
					continue;
				com.strncpy( temp, wad->lumps[i].name, sizeof( temp ));
				while( temp[0] )
				{
					if( matchpattern( temp, wadpattern, true ))
					{
						for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
						{
							if( !com.strcmp( resultlist.strings[resultlistindex], temp ))
								break;
						}
						if( resultlistindex == resultlist.numstrings )
						{
							// build path: wadname/lumpname.ext
							com.snprintf( temp2, sizeof(temp2), "%s/%s", wadfolder, temp );
							FS_DefaultExtension( temp2, va(".%s", W_ExtFromType( wad->lumps[i].type ))); // make ext
							stringlistappend( &resultlist, temp2 );
							if( !quiet ) MsgDev( D_INFO, "SearchWadFile: %s : %s\n", wad->filename, temp2 );
						}
					}
					// strip off one path element at a time until empty
					// this way directories are added to the listing if they match the pattern
					slash = com.strrchr( temp, '/' );
					backslash = com.strrchr( temp, '\\' );
					colon = com.strrchr( temp, ':' );
					separator = temp;
					if( separator < slash )
						separator = slash;
					if( separator < backslash )
						separator = backslash;
					if( separator < colon )
						separator = colon;
					*((char *)separator) = 0;
				}
			}
		}
		else
		{
			// get a directory listing and look at each name
			com.sprintf( netpath, "%s%s", searchpath->filename, basepath );
			stringlistinit( &dirlist );
			listdirectory( &dirlist, netpath );
			for( dirlistindex = 0; dirlistindex < dirlist.numstrings; dirlistindex++ )
			{
				com.sprintf( temp, "%s%s", basepath, dirlist.strings[dirlistindex] );
				if( matchpattern( temp, (char *)pattern, true ))
				{
					for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
					{
						if( !com.strcmp( resultlist.strings[resultlistindex], temp ))
							break;
					}
					if( resultlistindex == resultlist.numstrings )
					{
						stringlistappend( &resultlist, temp );
						if( !quiet ) MsgDev( D_INFO, "SearchDirFile: %s\n", temp );
					}
				}
			}
			stringlistfreecontents( &dirlist );
		}
	}

	if( resultlist.numstrings )
	{
		stringlistsort( &resultlist );
		numfiles = resultlist.numstrings;
		numchars = 0;
		for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
			numchars += (int)com.strlen( resultlist.strings[resultlistindex]) + 1;
		search = Mem_Alloc( fs_mempool, sizeof(search_t) + numchars + numfiles * sizeof( char * ));
		search->filenames = (char **)((char *)search + sizeof(search_t));
		search->filenamesbuffer = (char *)((char *)search + sizeof(search_t) + numfiles * sizeof( char * ));
		search->numfilenames = (int)numfiles;
		numfiles = 0;
		numchars = 0;
		for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
		{
			size_t	textlen;

			search->filenames[numfiles] = search->filenamesbuffer + numchars;
			textlen = com.strlen(resultlist.strings[resultlistindex]) + 1;
			Mem_Copy( search->filenames[numfiles], resultlist.strings[resultlistindex], textlen );
			numfiles++;
			numchars += (int)textlen;
		}
	}
	stringlistfreecontents( &resultlist );

	Mem_Free( basepath );
	return search;
}

search_t *FS_Search(const char *pattern, int caseinsensitive )
{
	return _FS_Search( pattern, caseinsensitive, true );
}

void FS_Mem_FreeSearch( search_t *search )
{
	Mem_Free( search );
}

void FS_InitMemory( void )
{
	fs_mempool = Mem_AllocPool( "Filesystem Pool" );	

	// add a path separator to the end of the basedir if it lacks one
	if( fs_basedir[0] && fs_basedir[com.strlen(fs_basedir) - 1] != '/' && fs_basedir[com.strlen(fs_basedir) - 1] != '\\' )
		com.strncat( fs_basedir, "/", sizeof( fs_basedir ));

	fs_searchpaths = NULL;
}

/*
================
FS_CheckParm

Returns the position (1 to argc-1) in the program's argument list
where the given parameter apears, or 0 if not present
================
*/
int FS_CheckParm( const char *parm )
{
	int	i;

	for( i = 1; i < fs_argc; i++ )
	{
		// NEXTSTEP sometimes clears appkit vars.
		if( !fs_argv[i] ) continue;
		if( !com.stricmp( parm, fs_argv[i] )) return i;
	}
	return 0;
}

void FS_GetBaseDir( char *pszBuffer, char *out )
{
	char	basedir[ MAX_SYSPATH ];
	char	szBuffer[ MAX_SYSPATH ];
	int	j;
	char	*pBuffer = NULL;

	com.strcpy( szBuffer, pszBuffer );

	pBuffer = com.strrchr( szBuffer,'\\' );
	if ( pBuffer ) *(pBuffer+1) = '\0';

	com.strcpy( basedir, szBuffer );

	j = com.strlen( basedir );
	if( j > 0 )
	{
		if(( basedir[ j-1 ] == '\\' ) || ( basedir[ j-1 ] == '/' ))
			basedir[ j-1 ] = 0;
	}
	com.strcpy( out, basedir );
}

void FS_ReadEnvironmentVariables( char *pPath )
{
	// get basepath from registry
	REG_GetValue( HKEY_LOCAL_MACHINE, "System\\CurrentControlSet\\Control\\Session Manager\\Environment", "Xash3D", pPath );
}

void FS_SaveEnvironmentVariables( char *pPath )
{
	// save new path
	REG_SetValue( HKEY_LOCAL_MACHINE, "System\\CurrentControlSet\\Control\\Session Manager\\Environment", "Xash3D", pPath );
	SendMessageTimeout( HWND_BROADCAST, WM_SETTINGCHANGE, 0, 0, SMTO_NORMAL, 10, NULL); // system update message
}

static void FS_BuildPath( char *pPath, char *pOut )
{
	// set working directory
	SetCurrentDirectory ( pPath );
	com.sprintf( pOut, "%s\\bin\\launch.dll", pPath );
}

void FS_UpdateEnvironmentVariables( void )
{
	char	szTemp[4096];
	char	szPath[MAX_SYSPATH]; // test path
	
	// NOTE: we want set "real" work directory
	// defined in environment variables, but in some reasons
	// we need make some additional checks before set current dir
          
          // get variable from registry and current directory
	FS_ReadEnvironmentVariables( szTemp );
	GetCurrentDirectory( MAX_SYSPATH, sys_rootdir );
	
	// if both values is math - no run additional tests		
	if( com.stricmp( sys_rootdir, szTemp ))
	{
		// Step1: path from registry have higher priority than current working directory
		// because user can execute launcher from random place or from a bat-file
                    // so, set current working directory as path from registry and test it

		FS_BuildPath( szTemp, szPath );
		if( !FS_SysFileExists( szPath )) // Step2: engine root dir has been moved to other place?
		{
			FS_BuildPath( sys_rootdir, szPath );
			if( !FS_SysFileExists( szPath )) // Step3: directly execute from bin directory?
			{
				// Step4: create last test for bin directory
			          FS_GetBaseDir( sys_rootdir, szTemp );
				FS_BuildPath( szTemp, szPath );
				if( !FS_SysFileExists( szPath ))
				{
					// big bada-boom: engine was moved and launcher was running from other place
					// step5: so, path form registry is invalid, current path is no valid
					Sys_Break( "Invalid root directory!\n\rPlease re-install Xash3D\n" );
				}
				else FS_SaveEnvironmentVariables( szTemp ); // update registry
			}
			else FS_SaveEnvironmentVariables( sys_rootdir );
		}
	}
}

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

VIRTUAL FILE SYSTEM - WRITE DATA INTO MEMORY

=============================================================================
*/
vfile_t *VFS_Create( const byte *buffer, size_t buffsize)
{
	vfile_t *file = (vfile_t *)Mem_Alloc( fs_mempool, sizeof (*file));

	file->length = file->buffsize = buffsize;
	file->buff = Mem_Alloc(fs_mempool, (file->buffsize));	
	file->offset = 0;
	file->mode = O_RDONLY;
	Mem_Copy( file->buff, buffer, buffsize );

	return file;
}

vfile_t *VFS_Open(file_t *handle, const char* mode)
{
	vfile_t	*file = (vfile_t *)Mem_Alloc (fs_mempool, sizeof (vfile_t));

	// If the file is opened in "write", "append", or "read/write" mode
	if (mode[0] == 'w')
	{
		file->compress = (mode[1] == 'z') ? true : false; 
		file->handle = handle;
		file->buffsize = (64 * 1024); // will be resized if need
		file->buff = Mem_Alloc(fs_mempool, (file->buffsize));
		file->length = 0;
		file->offset = 0;
		file->mode = O_WRONLY;
	}
	else if (mode[0] == 'r')
	{
		int curpos, endpos;

		file->compress = false;
		file->handle = handle;
		curpos = FS_Tell(file->handle);
		FS_Seek(file->handle, 0, SEEK_END);
		endpos = FS_Tell(file->handle);
		FS_Seek(file->handle, curpos, SEEK_SET);

		file->buffsize = endpos - curpos;
		file->buff = Mem_Alloc(fs_mempool, (file->buffsize));

		FS_Read(file->handle, file->buff, file->buffsize);		
		file->length = file->buffsize;
		file->offset = 0;
		file->mode = O_RDONLY;
	}
	else
	{
		Mem_Free( file );
		MsgDev( D_ERROR, "VFS_Open: unsupported mode %s\n", mode );
		return NULL;
	}
	return file;
}

fs_offset_t VFS_Read( vfile_t* file, void* buffer, size_t buffersize)
{
	fs_offset_t read_size = 0;

	if ( buffersize == 0 ) return 1;
	if (!file) return 0;

	// check for enough room
	if(file->offset >= file->length)
	{
		return 0; //hit EOF
	}
	if(file->offset + buffersize <= file->length)
	{
		Mem_Copy( buffer, file->buff + file->offset, buffersize );
		file->offset += buffersize;
		read_size = buffersize;
	}
	else
	{
		int reduced_size = file->length - file->offset;
		Mem_Copy( buffer, file->buff + file->offset, reduced_size );
		file->offset += reduced_size;
		read_size = reduced_size;
		MsgDev( D_NOTE, "VFS_Read: vfs buffer is out\n");
	}
	return read_size;
}

fs_offset_t VFS_Write( vfile_t *file, const void *buf, size_t size )
{
	if(!file) return -1;

	if (file->offset + size >= file->buffsize)
	{
		int newsize = file->offset + size + (64 * 1024);

		if (file->buffsize < newsize)
		{
			// reallocate buffer now
			file->buff = Mem_Realloc( fs_mempool, file->buff, newsize );		
			file->buffsize = newsize; // merge buffsize
		}
	}

	// write into buffer
	Mem_Copy( file->buff + file->offset, (byte *)buf, size );
	file->offset += size;

	if( file->offset > file->length ) 
		file->length = file->offset;

	return file->length;
}

byte *VFS_GetBuffer( vfile_t *file )
{
	if( !file ) return NULL;
	return file->buff;
}

/*
====================
VFS_Print

Print a string into a file
====================
*/
int VFS_Print( vfile_t* file, const char *msg )
{
	return (int)VFS_Write( file, msg, com.strlen( msg ));
}

/*
====================
VFS_VPrintf

Print a string into a buffer
====================
*/
int VFS_VPrintf(vfile_t* file, const char* format, va_list ap)
{
	int		len;
	fs_offset_t	buff_size = MAX_MSGLEN;
	char		*tempbuff;

	while( 1 )
	{
		tempbuff = (char *)Mem_Alloc( fs_mempool, buff_size );
		len = com.vsprintf( tempbuff, format, ap );
		if( len >= 0 && len < buff_size ) break;
		Mem_Free( tempbuff );
		buff_size *= 2;
	}

	len = VFS_Write( file, tempbuff, len );
	Mem_Free( tempbuff );

	return len;
}

/*
====================
VFS_Printf

Print a string into a buffer
====================
*/
int VFS_Printf(vfile_t* file, const char* format, ...)
{
	int result;
	va_list args;

	va_start(args, format);
	result = VFS_VPrintf(file, format, args);
	va_end (args);

	return result;
}

fs_offset_t VFS_Tell (vfile_t* file)
{
	if (!file) return -1;
	return file->offset;
}

bool VFS_Eof( vfile_t* file)
{
	if (!file) return true;
	return (file->offset == file->length) ? true : false;
}

/*
====================
VFS_Getc

Get the next character of a file
====================
*/
int VFS_Getc( vfile_t *file )
{
	char c;

	if(!VFS_Read( file, &c, 1 ))
		return EOF;
	return c;
}

int VFS_Gets( vfile_t* file, byte *string, size_t bufsize )
{
	int	c, end = 0;

	while( 1 )
	{
		c = VFS_Getc( file );
		if (c == '\r' || c == '\n' || c < 0)
			break;
		if (end < bufsize - 1) string[end++] = c;
	}
	string[end] = 0;

	// remove \n following \r
	if (c == '\r')
	{
		c = VFS_Getc( file );
		if (c != '\n') VFS_Seek( file, -1, SEEK_CUR ); // rewind
	}
	MsgDev(D_INFO, "VFS_Gets: %s\n", string);

	return c;
}

int VFS_Seek( vfile_t *file, fs_offset_t offset, int whence )
{
	if (!file) return -1;

	// Compute the file offset
	switch (whence)
	{
		case SEEK_CUR:
			offset += file->offset;
			break;
		case SEEK_SET:
			break;
		case SEEK_END:
			offset += file->length;
			break;
		default: 
			return -1;
	}

	if (offset < 0 || offset > (long)file->length) return -1;

	file->offset = offset;
	return 0;
}

bool VFS_Unpack( void* compbuf, size_t compsize, void **dst, size_t size )
{
	char	*buf = *dst;
	z_stream	strm = {compbuf, compsize, 0, buf, size, 0, NULL, NULL, NULL, NULL, NULL, 0, 0, 0 };

	inflateInit( &strm );
	if( Z_STREAM_END != inflate( &strm, Z_FINISH )) // decompress it in one go.
	{
		if( !com.strlen( strm.msg )) MsgDev( D_NOTE, "VFS_Unpack: failed block decompression\n" );
		else MsgDev( D_NOTE, "VFS_Unpack: failed block decompression: %s\n", strm.msg );
		return false;
	}
	inflateEnd( &strm );
	return true;
}

file_t *VFS_Close( vfile_t *file )
{
	file_t	*handle;
	char	out[8192]; // chunk size
	z_stream	strm = {file->buff, file->length, 0, out, sizeof(out), 0, NULL, NULL, NULL, NULL, NULL, 0, 0, 0 };
	
	if(!file) return NULL;

	if(file->mode == O_WRONLY)
	{
		if( file->compress ) // deflate before writing
		{
			deflateInit( &strm, 9 ); // Z_BEST_COMPRESSION
			while(deflate(&strm, Z_FINISH) == Z_OK)
			{
				FS_Write( file->handle, out, sizeof(out) - strm.avail_out);
				strm.next_out = out;
				strm.avail_out = sizeof(out);
			}
			FS_Write( file->handle, out, sizeof(out) - strm.avail_out );
			deflateEnd( &strm );
		}
		else if( file->handle )
			FS_Write(file->handle, file->buff, (file->length + 3) & ~3); // align
	}
	handle = file->handle; // keep real handle

	if( file->buff ) Mem_Free( file->buff );
	Mem_Free( file ); // himself

	return handle;
}


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

WADSYSTEM PRIVATE COMMON FUNCTIONS

=============================================================================
*/
// associate extension with wad type
static const wadtype_t wad_types[] =
{
{ "flp", TYPE_FLMP	}, // doom1 menu picture
{ "snd", TYPE_SND	}, // doom1 sound
{ "mus", TYPE_MUS	}, // doom1 .mus format
{ "skn", TYPE_SKIN	}, // doom1 sprite model
{ "flt", TYPE_FLAT	}, // doom1 wall texture
{ "pal", TYPE_QPAL	}, // palette
{ "lmp", TYPE_QPIC	}, // quake1, hl pic
{ "fnt", TYPE_QFONT	}, // hl qfonts
{ "mip", TYPE_MIPTEX}, // hl/q1 mip
{ "raw", TYPE_RAW	}, // signed raw data
{ "wav", TYPE_SOUND	}, // wav sounds (hl2)
{ "txt", TYPE_SCRIPT}, // any script file
{ NULL, TYPE_NONE	}
};

static char W_TypeFromExt( const char *lumpname )
{
	const char	*ext = FS_FileExtension( lumpname );
	const wadtype_t	*type;

	// we not known about filetype, so match only by filename
	if( !com.strcmp( ext, "*" ) || !com.strcmp( ext, "" ))
		return TYPE_ANY;
	
	for( type = wad_types; type->ext; type++ )
	{
		if(!com.stricmp( ext, type->ext ))
			return type->type;
	}
	return TYPE_NONE;
}

static const char *W_ExtFromType( char lumptype )
{
	const wadtype_t	*type;

	// we not known aboyt filetype, so match only by filename
	if( lumptype == TYPE_NONE || lumptype == TYPE_ANY )
		return "";

	for( type = wad_types; type->ext; type++ )
	{
		if( lumptype == type->type )
			return type->ext;
	}
	return "";
}

static dlumpinfo_t *W_FindLump( wfile_t *wad, const char *name, const char matchtype )
{
	int	i;

	if( !wad || !wad->lumps || matchtype == TYPE_NONE )
		return NULL;

	// serach trough current wad
	for( i = 0; i < wad->numlumps; i++)
	{
		// filtering lumps by type first
		if( matchtype == TYPE_ANY || matchtype == wad->lumps[i].type )
		{
			if( !com.stricmp( name, wad->lumps[i].name ))
				return &wad->lumps[i]; // found
		}
	}
	return NULL;
}

static void W_CleanupName( const char *dirtyname, char *cleanname )
{
	string	tempname;

	if( !dirtyname || !cleanname ) return;

	cleanname[0] = '\0'; // clear output
	FS_FileBase( dirtyname, tempname );
	if( com.strlen( tempname ) > WAD3_NAMELEN )
	{
		// windows style cutoff long names
		// FIXME: probably can make duplicate names
		tempname[14] = '~';
		tempname[15] = '1';
	}
	tempname[16] = '\0'; // cutoff all other ...
	com.strncpy( cleanname, tempname, 16 );

	// .. and turn big letters
	com.strupr( cleanname, cleanname );
}

static bool W_ConvertIWADLumps( wfile_t *wad )
{
	dlumpfile_t	*doomlumps;
	bool		flat_images = false;	// doom1 wall texture marker
	bool		skin_images = false;	// doom1 skin image ( sprite model ) marker
	bool		flmp_images = false;	// doom1 menu image marker
	size_t		lat_size;			// LAT - LumpAllocationTable		
	int		i, k;

	// nothing to convert ?
	if( !wad ) return false;

	lat_size = wad->numlumps * sizeof( dlumpfile_t );
	doomlumps = (dlumpfile_t *)Mem_Alloc( wad->mempool, lat_size );

	if( FS_Read( wad->file, doomlumps, lat_size ) != lat_size )
	{
		MsgDev( D_ERROR, "W_ConvertIWADLumps: %s has corrupted lump allocation table\n", wad->filename );
		Mem_Free( doomlumps );
		W_Close( wad );
		return false;
	}

	// convert doom1 format into WAD3 lump format
	for( i = 0; i < wad->numlumps; i++ )
	{
		// W_Open will be swap lump later
		wad->lumps[i].filepos = doomlumps[i].filepos;
		wad->lumps[i].size = wad->lumps[i].disksize = doomlumps[i].size;
		com.strnlwr( doomlumps[i].name, wad->lumps[i].name, 9 );
		wad->lumps[i].compression = CMP_NONE;
		wad->lumps[i].type = TYPE_NONE;

		// check for backslash issues
		k = com.strlen( com_strchr( wad->lumps[i].name, '\\' ));
		if( k ) wad->lumps[i].name[com.strlen( wad->lumps[i].name )-k] = '#'; // vile1.spr issues
	
		// textures begin
		if( !com.stricmp( "S_START", wad->lumps[i].name ))
		{
			skin_images = true;
			continue; // skip identifier
		}
		else if( !com.stricmp( "P_START", wad->lumps[i].name ))
		{
			flat_images = true;
			continue; // skip identifier
		}
		else if( !com.stricmp( "P1_START", wad->lumps[i].name ))
		{
			flat_images = true;
			continue; // skip identifier
		}
		else if( !com.stricmp( "P2_START", wad->lumps[i].name ))
		{
			flat_images = true;
			continue; // skip identifier
		}
		else if( !com.stricmp( "P3_START", wad->lumps[i].name ))
		{
			// only doom2 uses this name
			flat_images = true;
			continue; // skip identifier
		}
		else if( !com.strnicmp( "WI", wad->lumps[i].name, 2 )) flmp_images = true;
		else if( !com.strnicmp( "ST", wad->lumps[i].name, 2 )) flmp_images = true;
		else if( !com.strnicmp( "M_", wad->lumps[i].name, 2 )) flmp_images = true;
		else if( !com.strnicmp( "END", wad->lumps[i].name, 3 )) flmp_images = true;
		else if( !com.strnicmp( "HELP", wad->lumps[i].name, 4 )) flmp_images = true;
		else if( !com.strnicmp( "CREDIT", wad->lumps[i].name, 6 )) flmp_images = true;
		else if( !com.strnicmp( "TITLEPIC", wad->lumps[i].name, 8 )) flmp_images = true;
		else if( !com.strnicmp( "VICTORY", wad->lumps[i].name, 7 )) flmp_images = true;
		else if( !com.strnicmp( "PFUB", wad->lumps[i].name, 4 )) flmp_images = true;
		else if( !com.stricmp( "P_END", wad->lumps[i].name )) flat_images = false;
		else if( !com.stricmp( "P1_END", wad->lumps[i].name )) flat_images = false;
		else if( !com.stricmp( "P2_END", wad->lumps[i].name )) flat_images = false;
		else if( !com.stricmp("P3_END", wad->lumps[i].name )) flat_images = false;
		else if( !com.stricmp( "S_END", wad->lumps[i].name )) skin_images = false;
		else flmp_images = false;

		// setup lumptypes for doomwads
		if( flmp_images ) wad->lumps[i].type = TYPE_FLMP; // mark as menu pic
		if( flat_images ) wad->lumps[i].type = TYPE_FLAT; // mark as texture
		if( skin_images ) wad->lumps[i].type = TYPE_SKIN; // mark as skin (sprite model)
		if(!com.strnicmp( wad->lumps[i].name, "D_", 2 )) wad->lumps[i].type = TYPE_MUS;
		if(!com.strnicmp( wad->lumps[i].name, "DS", 2 )) wad->lumps[i].type = TYPE_SND;

		// remove invalid resources
		if(!com.strnicmp( wad->lumps[i].name, "ENDOOM", 6 )) wad->lumps[i].type = TYPE_NONE;
		if(!com.strnicmp( wad->lumps[i].name, "STEP1", 5 )) wad->lumps[i].type = TYPE_NONE;
		if(!com.strnicmp( wad->lumps[i].name, "STEP2", 5 )) wad->lumps[i].type = TYPE_NONE;
	}

	Mem_Free( doomlumps ); // no need anymore
	return true;
}

static bool W_ReadLumpTable( wfile_t *wad )
{
	size_t	lat_size;
	int	i, k;

	// nothing to convert ?
	if( !wad ) return false;

	lat_size = wad->numlumps * sizeof( dlumpinfo_t );
	if( FS_Read( wad->file, wad->lumps, lat_size ) != lat_size )
	{
		MsgDev( D_ERROR, "W_ReadLumpTable: %s has corrupted lump allocation table\n", wad->filename );
		W_Close( wad );
		return false;
	}

	// swap everything 
	for( i = 0; i < wad->numlumps; i++ )
	{
		wad->lumps[i].filepos = LittleLong( wad->lumps[i].filepos );
		wad->lumps[i].disksize = LittleLong( wad->lumps[i].disksize );
		wad->lumps[i].size = LittleLong( wad->lumps[i].size );

		// cleanup lumpname
		com.strnlwr( wad->lumps[i].name, wad->lumps[i].name, sizeof(wad->lumps[i].name));

		// check for '*' symbol issues
		k = com.strlen( com.strrchr( wad->lumps[i].name, '*' ));
		if( k ) wad->lumps[i].name[com.strlen(wad->lumps[i].name)-k] = '!'; // quake1 issues

		// convert all qmip types to miptex
		if( wad->lumps[i].type == TYPE_QMIP ) wad->lumps[i].type = TYPE_MIPTEX;

		// check for Quake 'conchars' issues (only lmp loader supposed to read this lame pic)
		if( !com.stricmp( wad->lumps[i].name, "conchars" ) && wad->lumps[i].type == TYPE_QMIP )
			wad->lumps[i].type = TYPE_QPIC; 
	}
	return true;
}

byte *W_ReadLump( wfile_t *wad, dlumpinfo_t *lump, size_t *lumpsizeptr )
{
	byte	*buf, *cbuf;
	size_t	size = 0;

	// assume error
	if( lumpsizeptr ) *lumpsizeptr = 0;

	// no wads loaded
	if( !wad || !lump ) return NULL;

	if( FS_Seek( wad->file, lump->filepos, SEEK_SET ))
	{
		MsgDev( D_ERROR, "W_ReadLump: %s is corrupted\n", lump->name );
		return NULL;
	}

	switch( lump->compression )
	{
	case CMP_NONE:
		buf = (byte *)Mem_Alloc( wad->mempool, lump->disksize );
		size = FS_Read( wad->file, buf, lump->disksize );
		if( size < lump->disksize )
		{
			MsgDev( D_WARN, "W_ReadLump: %s is probably corrupted\n", lump->name );
			Mem_Free( buf );
			return NULL;
		}
		break;
	case CMP_LZSS:
		// never used by Id Software or Valve ?
		MsgDev(D_WARN, "W_ReadLump: lump %s have unsupported compression type\n", lump->name );
		return NULL;
	case CMP_ZLIB:
		cbuf = (byte *)Mem_Alloc( wad->mempool, lump->disksize );
		size = FS_Read( wad->file, cbuf, lump->disksize );
		buf = (byte *)Mem_Alloc( wad->mempool, lump->size );
		if(!VFS_Unpack( cbuf, size, &buf, lump->size ))
		{
			MsgDev( D_WARN, "W_ReadLump: %s is probably corrupted\n", lump->name );
			Mem_Free( cbuf );
			Mem_Free( buf );
			return NULL;
		}
		Mem_Free( cbuf ); // no reason to keep this data
		break;
	}					

	if( lumpsizeptr ) *lumpsizeptr = lump->size;
	return buf;
}

bool W_WriteLump( wfile_t *wad, dlumpinfo_t *lump, const void* data, size_t datasize, char cmp )
{
	size_t	ofs;
	vfile_t	*h;

	if( !wad || !lump ) return false;
	if( !data || !datasize )
	{
		MsgDev( D_WARN, "W_WriteLump: ignore blank lump %s - nothing to save\n", lump->name );
		return false;
	}
	switch(( int )cmp)
	{
	case CMP_LZSS:
		// never used by Id Software or Valve ?
		MsgDev( D_WARN, "W_SaveLump: lump %s can't be saved with comptype LZSS\n", lump->name );
		return false;		
	case CMP_ZLIB:
		h = VFS_Open( wad->file, "wz" );
		lump->size = datasize; // realsize
		VFS_Write( h, data, datasize );
		wad->file = VFS_Close( h );		// go back to real filesystem
		ofs = FS_Tell( wad->file );		// ofs - info->filepos returns compressed size
		lump->disksize = LittleLong( ofs - lump->filepos );
		return true;
	default:	// CMP_NONE method
		lump->size = lump->disksize = LittleLong( datasize );
		FS_Write( wad->file, data, datasize ); // just write file
		return true;
	}
}

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

WADSYSTEM PUBLIC BASE FUNCTIONS

=============================================================================
*/
int W_Check( const char *filename )
{
	file_t		*testwad;
	dwadinfo_t	header;
	int		numlumps;
	int		infotableofs;
	
	testwad = FS_Open( filename, "rb" );
	if( !testwad ) return 0; // just not exist

	if( FS_Read( testwad, &header, sizeof(dwadinfo_t)) != sizeof(dwadinfo_t))
	{
		// corrupted or not wad
		FS_Close( testwad );
		return -1; // too small file
	}	

	switch( header.ident )
	{
	case IDIWADHEADER:
	case IDPWADHEADER:
	case IDWAD2HEADER:
	case IDWAD3HEADER: break;
	default:
		FS_Close( testwad );
		return -2; // invalid id
	}

	numlumps = LittleLong( header.numlumps );
	if( numlumps < 0 || numlumps > MAX_FILES_IN_WAD )
	{
		// invalid lump number
		FS_Close( testwad );
		return -3; // invalid lumpcount
	}
	infotableofs = LittleLong( header.infotableofs );
	if( FS_Seek( testwad, infotableofs, SEEK_SET ))
	{
		// corrupted or not wad
		FS_Close( testwad );
		return -4; // invalid lumptable
	}

	// all check is done
	FS_Close( testwad );
	return 1; // valid
}

wfile_t *W_Open( const char *filename, const char *mode )
{
	dwadinfo_t	header;
	wfile_t		*wad = (wfile_t *)Mem_Alloc( fs_mempool, sizeof( wfile_t ));

	if( mode[0] == 'a' ) wad->file = FS_Open( filename, "r+b" );
	else if( mode[0] == 'w' ) wad->file = FS_Open( filename, "wb" );
	else if( mode[0] == 'r' ) wad->file = FS_Open( filename, "rb" );

	if( !wad->file )
	{
		W_Close( wad );
		MsgDev( D_ERROR, "W_Open: couldn't open %s\n", filename );
		return NULL;
	}

	// copy wad name
	com.strncpy( wad->filename, filename, sizeof( wad->filename ));
	wad->mempool = Mem_AllocPool( filename );
	wad->filetime = wad->file->filetime;

	// if the file is opened in "write", "append", or "read/write" mode
	if( mode[0] == 'w' )
	{
		dwadinfo_t	hdr;

		wad->numlumps = 0;		// blank wad
		wad->lumps = NULL;		//
		wad->mode = O_WRONLY;

		// save space for header
		hdr.ident = IDWAD3HEADER;
		hdr.numlumps = LittleLong( wad->numlumps );
		hdr.infotableofs = LittleLong(sizeof( dwadinfo_t ));
		FS_Write( wad->file, &hdr, sizeof( hdr ));
		FS_Print( wad->file, "Generated by Xash WadLib. " );
		wad->infotableofs = FS_Tell( wad->file );
	}
	else if( mode[0] == 'r' || mode[0] == 'a' )
	{
		if( mode[0] == 'a' )
		{
			FS_Seek( wad->file, 0, SEEK_SET );
			wad->mode = O_APPEND;
		}

		if( FS_Read( wad->file, &header, sizeof( dwadinfo_t )) != sizeof( dwadinfo_t ))
		{
			MsgDev( D_ERROR, "W_Open: %s can't read header\n", filename );
			W_Close( wad );
			return NULL;
		}

		switch( header.ident )
		{
		case IDIWADHEADER:
		case IDPWADHEADER:
		case IDWAD2HEADER:
			if( wad->mode == O_APPEND )
			{
				MsgDev( D_WARN, "W_Open: %s is readonly\n", filename, mode );
				wad->mode = O_RDONLY; // set read-only mode
			}
			break; 
		case IDWAD3HEADER:
			break; // WAD3 allow r\w mode
		default:
			MsgDev( D_ERROR, "W_Open: %s unknown wadtype\n", filename );
			W_Close( wad );
			return NULL;
		}

		wad->numlumps = LittleLong( header.numlumps );
		if( wad->numlumps >= MAX_FILES_IN_WAD && wad->mode == O_APPEND )
		{
			MsgDev( D_WARN, "W_Open: %s is full (%i lumps)\n", wad->numlumps );
			wad->mode = O_RDONLY; // set read-only mode
		}
		wad->infotableofs = LittleLong( header.infotableofs ); // save infotableofs position
		if( FS_Seek( wad->file, wad->infotableofs, SEEK_SET ))
		{
			MsgDev( D_ERROR, "W_Open: %s can't find lump allocation table\n", filename );
			W_Close( wad );
			return NULL;
		}

		// NOTE: lumps table can be reallocated for O_APPEND mode
		wad->lumps = Mem_Alloc( wad->mempool, wad->numlumps * sizeof( dlumpinfo_t ));

		if( wad->mode == O_APPEND )
		{ 
			size_t	lat_size = wad->numlumps * sizeof( dlumpinfo_t );

			if( FS_Read( wad->file, wad->lumps, lat_size ) != lat_size )
			{
				MsgDev( D_ERROR, "W_ReadLumpTable: %s has corrupted lump allocation table\n", wad->filename );
				W_Close( wad );
				return NULL;
			}

			// if we are in append mode - we need started from infotableofs poisition
			// overwrite lumptable as well, we have her copy in wad->lumps
			FS_Seek( wad->file, wad->infotableofs, SEEK_SET );
		}
		else
		{
			// setup lump allocation table
			switch( header.ident )
			{
			case IDIWADHEADER:
			case IDPWADHEADER:
				if(!W_ConvertIWADLumps( wad ))
					return NULL;
				break;		
			case IDWAD2HEADER:
			case IDWAD3HEADER: 
				if(!W_ReadLumpTable( wad ))
					return NULL;
				break;
			}
		}
	}
	// and leaves the file open
	return wad;
}

void W_Close( wfile_t *wad )
{
	fs_offset_t	ofs;

	if( !wad ) return;

	if( wad->file && ( wad->mode == O_APPEND || wad->mode == O_WRONLY ))
	{
		dwadinfo_t	hdr;

		// write the lumpingo
		ofs = FS_Tell( wad->file );
		FS_Write( wad->file, wad->lumps, wad->numlumps * sizeof( dlumpinfo_t ));
		
		// write the header
		hdr.ident = IDWAD3HEADER;
		hdr.numlumps = LittleLong( wad->numlumps );
		hdr.infotableofs = LittleLong( ofs );

		FS_Seek( wad->file, 0, SEEK_SET );
		FS_Write( wad->file, &hdr, sizeof( hdr ));
	}

	Mem_FreePool( &wad->mempool );
	if( wad->file ) FS_Close( wad->file );	
	Mem_Free( wad ); // free himself
}

fs_offset_t W_SaveLump( wfile_t *wad, const char *lump, const void* data, size_t datasize, char type, char cmp )
{
	size_t		lat_size;
	dlumpinfo_t	*info;
	int	i;

	if( !wad || !lump ) return -1;
	if( !data || !datasize )
	{
		MsgDev( D_WARN, "W_SaveLump: ignore blank lump %s - nothing to save\n", lump );
		return -1;
	}
	if( wad->mode == O_RDONLY )
	{
		MsgDev( D_ERROR, "W_SaveLump: %s opened in readonly mode\n", wad->filename ); 
		return -1;
	}
	if( wad->numlumps >= MAX_FILES_IN_WAD )
	{
		MsgDev( D_ERROR, "W_SaveLump: %s is full\n", wad->filename ); 
		return -1;
	}
	if( W_FindLump( wad, lump, type ))
	{
		// don't make mirror lumps
		MsgDev( D_ERROR, "W_SaveLump: %s already exist\n", lump ); 
		return -1;
	}

	lat_size = sizeof( dlumpinfo_t ) * (wad->numlumps + 1);

	// reallocate lumptable
	wad->lumps = Mem_Realloc( wad->mempool, wad->lumps, lat_size );
	info = wad->lumps + wad->numlumps;

	// write header
	W_CleanupName( lump, info->name );
	info->filepos = LittleLong( FS_Tell( wad->file ));
	info->compression = cmp;
	info->type = type;

	i = FS_Tell( wad->file );
	if(!W_WriteLump( wad, info, data, datasize, cmp ))
		return -1;		

	MsgDev( D_NOTE, "W_SaveLump: %s, size %d\n", info->name, info->disksize );
	return wad->numlumps++;
}

byte *W_LoadLump( wfile_t *wad, const char *lumpname, size_t *lumpsizeptr, const char type )
{
	dlumpinfo_t	*lump;

	// assume error
	if( lumpsizeptr ) *lumpsizeptr = 0;

	if( !wad ) return NULL;
	lump = W_FindLump( wad, lumpname, type );
	return W_ReadLump( wad, lump, lumpsizeptr );
}

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

FILESYSTEM IMPLEMENTATION

=============================================================================
*/
static byte *W_LoadFile( const char *path, fs_offset_t *lumpsizeptr )
{
	searchpath_t	*search;
	int		index;

	search = FS_FindFile( path, &index, true, false );
	if( search && search->wad )
		return W_ReadLump( search->wad, &search->wad->lumps[index], lumpsizeptr ); 
	return NULL;
}