/*
filesystem.c - game filesystem based on DP fs
Copyright (C) 2007 Uncle Mike

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
*/

#include <fcntl.h>
#include <direct.h>
#include <sys/stat.h>
#include <io.h>
#include <time.h>
#include "common.h"
#include "wadfile.h"
#include "filesystem.h"
#include "library.h"
#include "mathlib.h"

#define FILE_BUFF_SIZE		2048

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		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];	// intermediate buffer
};

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

typedef struct packfile_s
{
	char		name[56];
	fs_offset_t	offset;
	fs_offset_t	realsize;	// real file size (uncompressed)
} packfile_t;

typedef struct pack_s
{
	char		filename[MAX_SYSPATH];
	int		handle;
	int		numfiles;
	time_t		filetime;	// common for all packed files
	packfile_t	*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
char		fs_rootdir[MAX_SYSPATH]; // engine root directory
char		fs_basedir[MAX_SYSPATH]; // base directory of game
char		fs_falldir[MAX_SYSPATH]; // game current directory
char		fs_gamedir[MAX_SYSPATH]; // game current directory
char		gs_basedir[MAX_SYSPATH]; // initial dir before loading gameinfo.txt (used for compilers too)
qboolean		fs_ext_path = false; // attempt to read\write from ./ or ../ pathes 

static void FS_InitMemory( void );
const char *FS_FileExtension( const char *in );
static searchpath_t *FS_FindFile( const char *name, int *index, qboolean 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 size );
static byte *W_LoadFile( const char *path, fs_offset_t *filesizeptr, qboolean gamedironly );
static qboolean 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 );

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

FILEMATCH COMMON SYSTEM

=============================================================================
*/
int matchpattern( const char *in, const char *pattern, qboolean 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 )
{
	Q_memset( 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 ) Q_memcpy( list->strings, oldstrings, list->numstrings * sizeof( *list->strings ));
		if( oldstrings ) Mem_Free( oldstrings );
	}

	textlen = Q_strlen( text ) + 1;
	list->strings[list->numstrings] = Mem_Alloc( fs_mempool, textlen );
	Q_memcpy( 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( Q_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;

	Q_strncpy( pattern, path, sizeof( pattern ));
	Q_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 size )
{
	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 = Q_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++;

	Q_strncpy( pfile->name, name, sizeof( pfile->name ));
	pfile->offset = offset;
	pfile->realsize = size;

	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)", s->pack->filename, s->pack->numfiles );
		else if( s->wad ) Msg( "%s (%i files)", s->wad->filename, s->wad->numlumps );
		else Msg( "%s", s->filename );

		if( s->flags & FS_GAMEDIR_PATH ) Msg( " ^2gamedir^7\n" );
		else Msg( "\n" );
	}
}

/*
============
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 )
{
	int	len, start, end;

	len = Q_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;

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

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

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

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

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

	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;
	}

	if( numpackfiles <= 0 )
	{
		MsgDev( D_ERROR, "%s has no files. Ignored.\n", packfile );
		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 ));
	Q_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_AddFileToPack( info[i].name, pack, info[i].filepos, info[i].filelen );
	}

	Mem_Free( info );
	MsgDev( D_NOTE, "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 qboolean FS_AddPack_Fullpath( const char *pakfile, qboolean *already_loaded, qboolean 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 && !Q_stricmp( search->pack->filename, pakfile ))
		{
			if( already_loaded ) *already_loaded = true;
			return true; // already loaded
		}
	}

	if( already_loaded ) *already_loaded = false;

	if( !Q_stricmp( ext, "pak" )) pak = FS_LoadPackPAK( 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 qboolean FS_AddWad_Fullpath( const char *wadfile, qboolean *already_loaded, qboolean 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 && !Q_stricmp( search->wad->filename, wadfile ))
		{
			if( already_loaded ) *already_loaded = true;
			return true; // already loaded
		}
	}
          
	if( already_loaded ) *already_loaded = false;
	if( !Q_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_NOTE, "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_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		fullpath;
	int		i;

	if(!( flags & FS_NOWRITE_PATH ))
		Q_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( !Q_stricmp( FS_FileExtension( list.strings[i] ), "pak" ))
		{
			Q_sprintf( fullpath, "%s%s", dir, list.strings[i] );
			FS_AddPack_Fullpath( fullpath, NULL, false, flags );
		}
	}

	// add any WAD package in the directory
	for( i = 0; i < list.numstrings; i++ )
	{
		if( !Q_stricmp( FS_FileExtension( list.strings[i] ), "wad" ))
		{
			Q_sprintf( fullpath, "%s%s", dir, list.strings[i] );
			FS_AddWad_Fullpath( fullpath, NULL, false );
		}
	}

	stringlistfreecontents( &list );

	// 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 ));
	Q_strncpy( search->filename, dir, sizeof ( search->filename ));
	search->next = fs_searchpaths;
	search->flags = flags;
	fs_searchpaths = search;


}

/*
================
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 = Q_strrchr( in, '/' );
	backslash = Q_strrchr( in, '\\' );
	if( !separator || separator < backslash ) separator = backslash;
	colon = Q_strrchr( in, ':' );
	if( !separator || separator < colon ) separator = colon;

	dot = Q_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 = Q_strrchr( in, '/' );
	backslash = Q_strrchr( in, '\\' );
	if( !separator || separator < backslash ) separator = backslash;
	colon = Q_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 + Q_strlen( path ) - 1;

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

	if( src != path )
	{
		Q_memcpy( dest, path, src - path );
		dest[src - path - 1] = 0; // cutoff backslash
	}
	else Q_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
			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, qboolean 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;

	// 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( Q_strstr( path, ":" ) && !fs_ext_path ) return 1; // non-portable attempt to go to root of drive

	// Amiga: // is parent directory
	if( Q_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( Q_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( Q_strchr( path, '.' ) && !fs_ext_path )
	{
		if( isgamedir ) return 2; // gamedir is entirely path elements, so simply forbid . entirely
		if( Q_strchr( path, '.' ) < Q_strrchr( path, '/' )) return 2; // possible attempt to go outside the game directory
	}

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

	// all: forbid leading dot on any filename for any reason
	if( Q_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", GI->title );

	FS_ClearSearchPath();

	if( Q_stricmp( GI->basedir, GI->gamedir ))
		FS_AddGameHierarchy( GI->basedir, 0 );
	if( Q_stricmp( GI->basedir, GI->falldir ))
		FS_AddGameHierarchy( GI->falldir, 0 );
	FS_AddGameHierarchy( GI->gamedir, FS_GAMEDIR_PATH );
}

void FS_Rescan_f( void )
{
	FS_Rescan();
}

static qboolean FS_ParseVector( char **pfile, float *v, size_t size )
{
	uint	i;
	string	token;
	qboolean	bracket = false;
	char	*saved;

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

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

	if( size == 1 )
	{
		*pfile = COM_ParseFile( *pfile, token );
		v[0] = Q_atof( token );
		return true;
	}

	saved = *pfile;

	if(( *pfile = COM_ParseFile( *pfile, token )) == NULL )
		return false;

	if( token[0] == '(' )
		bracket = true;
	else *pfile = saved; // restore token to right get it again

	for( i = 0; i < size; i++ )
	{
		*pfile = COM_ParseFile( *pfile, token );
		v[i] = Q_atof( token );
	}

	if( !bracket ) return true;	// done

	if(( *pfile = COM_ParseFile( *pfile, token )) == NULL )
		return false;

	if( token[0] == ')' )
		return true;
	return false;
}

/*
================
FS_WriteGameInfo

assume GameInfo is valid
================
*/
static qboolean FS_WriteGameInfo( const char *filepath, gameinfo_t *GameInfo )
{
	file_t	*f;
	int	i;

	if( !GameInfo ) return false;
	f = FS_Open( filepath, "w", false );	// we in binary-mode
	if( !f ) return false;

	FS_Print( f, "// generated by Xash3D\r\r\n" );

	if( Q_strlen( GameInfo->basedir ))
		FS_Printf( f, "basedir\t\t\"%s\"\n", GameInfo->basedir );

	if( Q_strlen( GameInfo->gamedir ))
		FS_Printf( f, "gamedir\t\t\"%s\"\n", GameInfo->gamedir );

	if( Q_strlen( GameInfo->falldir ))
		FS_Printf( f, "fallback_dir\t\"%s\"\n", GameInfo->falldir );

	if( Q_strlen( GameInfo->title ))
		FS_Printf( f, "title\t\t\"%s\"\n", GameInfo->title );

	if( Q_strlen( GameInfo->startmap ))
		FS_Printf( f, "startmap\t\t\"%s\"\n", GameInfo->startmap );

	if( Q_strlen( GameInfo->trainmap ))
		FS_Printf( f, "trainmap\t\t\"%s\"\n", GameInfo->trainmap );

	if( GameInfo->version != 0.0f )
		FS_Printf( f, "version\t\t%g\n", GameInfo->version );

	if( GameInfo->size != 0 )
		FS_Printf( f, "size\t\t%i\n", GameInfo->size );

	if( Q_strlen( GameInfo->game_url ))
		FS_Printf( f, "url_info\t\t\"%s\"\n", GameInfo->game_url );

	if( Q_strlen( GameInfo->update_url ))
		FS_Printf( f, "url_update\t\t\"%s\"\n", GameInfo->update_url );

	if( Q_strlen( GameInfo->type ))
		FS_Printf( f, "type\t\t\"%s\"\n", GameInfo->type );

	if( Q_strlen( GameInfo->date ))
		FS_Printf( f, "date\t\t\"%s\"\n", GameInfo->date );

	if( Q_strlen( GameInfo->dll_path ))
		FS_Printf( f, "dllpath\t\t\"%s\"\n", GameInfo->dll_path );	
	if( Q_strlen( GameInfo->game_dll ))
		FS_Printf( f, "gamedll\t\t\"%s\"\n", GameInfo->game_dll );

	switch( GameInfo->gamemode )
	{
	case 1: FS_Print( f, "gamemode\t\t\"singleplayer_only\"\n" ); break;
	case 2: FS_Print( f, "gamemode\t\t\"multiplayer_only\"\n" ); break;
	}

	if( Q_strlen( GameInfo->sp_entity ))
		FS_Printf( f, "sp_entity\t\t\"%s\"\n", GameInfo->sp_entity );
	if( Q_strlen( GameInfo->mp_entity ))
		FS_Printf( f, "mp_entity\t\t\"%s\"\n", GameInfo->mp_entity );

	for( i = 0; i < 4; i++ )
	{
		float	*min, *max;

		if( i && ( VectorIsNull( GameInfo->client_mins[i] ) || VectorIsNull( GameInfo->client_maxs[i] )))
			continue;

		min = GameInfo->client_mins[i];
		max = GameInfo->client_maxs[i];
		FS_Printf( f, "hull%i\t\t( %g %g %g ) ( %g %g %g )\n", i, min[0], min[1], min[2], max[0], max[1], max[2] );
	}

	if( GameInfo->max_edicts > 0 )
		FS_Printf( f, "max_edicts\t%i\n", GameInfo->max_edicts );
	if( GameInfo->max_tents > 0 )
		FS_Printf( f, "max_tempents\t%i\n", GameInfo->max_tents );
	if( GameInfo->max_beams > 0 )
		FS_Printf( f, "max_beams\t\t%i\n", GameInfo->max_beams );
	if( GameInfo->max_particles > 0 )
		FS_Printf( f, "max_particles\t%i\n", GameInfo->max_particles );

	FS_Print( f, "\r\r\n" );
	FS_Close( f );	// all done

	return true;
}

/*
================
FS_CreateDefaultGameInfo
================
*/
void FS_CreateDefaultGameInfo( const char *filename )
{
	gameinfo_t	defGI;

	Q_memset( &defGI, 0, sizeof( defGI ));

	// setup default values
	defGI.max_edicts = 900;	// default value if not specified
	defGI.max_tents = 500;
	defGI.max_beams = 128;
	defGI.max_particles = 4096;
	defGI.version = 1.0;
	defGI.falldir[0] = '\0';

	Q_strncpy( defGI.title, "New Game", sizeof( defGI.title ));
	Q_strncpy( defGI.gamedir, gs_basedir, sizeof( defGI.gamedir ));
	Q_strncpy( defGI.basedir, SI.ModuleName, sizeof( defGI.basedir ));
	Q_strncpy( defGI.sp_entity, "info_player_start", sizeof( defGI.sp_entity ));
	Q_strncpy( defGI.mp_entity, "info_player_deathmatch", sizeof( defGI.mp_entity ));
	Q_strncpy( defGI.dll_path, "cl_dlls", sizeof( defGI.dll_path ));
	Q_strncpy( defGI.game_dll, "dlls/hl.dll", sizeof( defGI.game_dll ));
	Q_strncpy( defGI.startmap, "newmap", sizeof( defGI.startmap ));

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

	// make simple gameinfo.txt
	FS_WriteGameInfo( filename, &defGI );
} 

static qboolean FS_ParseLiblistGam( const char *filename, const char *gamedir, gameinfo_t *GameInfo )
{
	char	*afile, *pfile;
	string	token;

	if( !GameInfo ) return false;	
	afile = FS_LoadFile( filename, NULL, false );
	if( !afile ) return false;

	// setup default values
	GameInfo->max_edicts = 900;	// default value if not specified
	GameInfo->max_tents = 500;
	GameInfo->max_beams = 128;
	GameInfo->max_particles = 4096;
	GameInfo->version = 1.0f;
	GameInfo->falldir[0] = '\0';
	
	Q_strncpy( GameInfo->title, "New Game", sizeof( GameInfo->title ));
	Q_strncpy( GameInfo->gamedir, gamedir, sizeof( GameInfo->gamedir ));
	Q_strncpy( GameInfo->basedir, SI.ModuleName, sizeof( GameInfo->basedir ));
	Q_strncpy( GameInfo->sp_entity, "info_player_start", sizeof( GameInfo->sp_entity ));
	Q_strncpy( GameInfo->mp_entity, "info_player_deathmatch", sizeof( GameInfo->mp_entity ));
	Q_strncpy( GameInfo->game_dll, "dlls/hl.dll", sizeof( GameInfo->game_dll ));
	Q_strncpy( GameInfo->startmap, "newmap", sizeof( GameInfo->startmap ));
	Q_strncpy( GameInfo->dll_path, "cl_dlls", sizeof( GameInfo->dll_path ));

	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 );

	pfile = afile;

	while(( pfile = COM_ParseFile( pfile, token )) != NULL )
	{
		if( !Q_stricmp( token, "game" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->title );
		}
		if( !Q_stricmp( token, "gamedir" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->gamedir );
		}
		if( !Q_stricmp( token, "fallback_dir" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->falldir );
		}
		else if( !Q_stricmp( token, "startmap" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->startmap );
			FS_StripExtension( GameInfo->startmap ); // HQ2:Amen has extension .bsp
		}
		else if( !Q_stricmp( token, "trainmap" ) || !Q_stricmp( token, "trainingmap" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->trainmap );
			FS_StripExtension( GameInfo->trainmap ); // HQ2:Amen has extension .bsp
		}
		else if( !Q_stricmp( token, "url_info" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_url );
		}
		else if( !Q_stricmp( token, "url_dl" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->update_url );
		}
		else if( !Q_stricmp( token, "gamedll" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_dll );
		}
		else if( !Q_stricmp( token, "type" ))
		{
			pfile = COM_ParseFile( pfile, token );

			if( !Q_stricmp( token, "singleplayer_only" ))
			{
				GameInfo->gamemode = 1;
				Q_strncpy( GameInfo->type, "Single", sizeof( GameInfo->type ));
			}
			else if( !Q_stricmp( token, "multiplayer_only" ))
			{
				GameInfo->gamemode = 2;
				Q_strncpy( GameInfo->type, "Multiplayer", sizeof( GameInfo->type ));
			}
			else
			{
				// pass type without changes
				GameInfo->gamemode = 0;
				Q_strncpy( GameInfo->type, token, sizeof( GameInfo->type ));
			}
		}
		else if( !Q_stricmp( token, "version" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->version = Q_atof( token );
		}
		else if( !Q_stricmp( token, "size" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->size = Q_atoi( token );
		}
		else if( !Q_stricmp( token, "mpentity" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->mp_entity );
		}
	}

	Mem_Free( afile );
	return true;
}

/*
================
FS_ConvertGameInfo
================
*/
void FS_ConvertGameInfo( const char *gamedir, const char *gameinfo_path, const char *liblist_path )
{
	gameinfo_t	GameInfo;

	Q_memset( &GameInfo, 0, sizeof( GameInfo ));

	if( FS_ParseLiblistGam( liblist_path, gamedir, &GameInfo ))
	{
		if( FS_WriteGameInfo( gameinfo_path, &GameInfo ))
			MsgDev( D_INFO, "Convert %s to %s\n", liblist_path, gameinfo_path );
	}
}

/*
================
FS_ParseGameInfo
================
*/
static qboolean FS_ParseGameInfo( const char *gamedir, gameinfo_t *GameInfo )
{
	char	*afile, *pfile;
	string	fs_path, filepath;
	string	liblist, token;

	Q_snprintf( filepath, sizeof( filepath ), "%s/gameinfo.txt", gamedir );
	Q_snprintf( liblist, sizeof( liblist ), "%s/liblist.gam", gamedir );

	// if user change liblist.gam update the gameinfo.txt
	if( FS_FileTime( liblist, false ) > FS_FileTime( filepath, false ))
		FS_ConvertGameInfo( gamedir, filepath, liblist );

	// force to create gameinfo for specified game if missing
	if( !Q_stricmp( gs_basedir, gamedir ) && !FS_FileExists( filepath, false ))
		FS_CreateDefaultGameInfo( filepath );

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

	afile = FS_LoadFile( filepath, NULL, false );
	if( !afile ) return false;

	// setup default values
	Q_strncpy( GameInfo->gamefolder, gamedir, sizeof( GameInfo->gamefolder ));
	GameInfo->max_edicts = 900;	// default value if not specified
	GameInfo->max_tents = 500;
	GameInfo->max_beams = 128;
	GameInfo->max_particles = 4096;
	GameInfo->version = 1.0f;
	GameInfo->falldir[0] = '\0';
	
	Q_strncpy( GameInfo->title, "New Game", sizeof( GameInfo->title ));
	Q_strncpy( GameInfo->sp_entity, "info_player_start", sizeof( GameInfo->sp_entity ));
	Q_strncpy( GameInfo->mp_entity, "info_player_deathmatch", sizeof( GameInfo->mp_entity ));
	Q_strncpy( GameInfo->dll_path, "cl_dlls", sizeof( GameInfo->dll_path ));
	Q_strncpy( GameInfo->game_dll, "dlls/hl.dll", sizeof( GameInfo->game_dll ));
	Q_strncpy( GameInfo->startmap, "", sizeof( GameInfo->startmap ));

	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 );

	pfile = afile;

	while(( pfile = COM_ParseFile( pfile, token )) != NULL )
	{
		if( !Q_stricmp( token, "basedir" ))
		{
			pfile = COM_ParseFile( pfile, fs_path );
			if( Q_stricmp( fs_path, GameInfo->basedir ) || Q_stricmp( fs_path, GameInfo->gamedir ))
				Q_strncpy( GameInfo->basedir, fs_path, sizeof( GameInfo->basedir ));
		}
		else if( !Q_stricmp( token, "fallback_dir" ))
		{
			pfile = COM_ParseFile( pfile, fs_path );
			if( Q_stricmp( fs_path, GameInfo->basedir ) || Q_stricmp( fs_path, GameInfo->falldir ))
				Q_strncpy( GameInfo->falldir, fs_path, sizeof( GameInfo->falldir ));
		}
		else if( !Q_stricmp( token, "gamedir" ))
		{
			pfile = COM_ParseFile( pfile, fs_path );
			if( Q_stricmp( fs_path, GameInfo->basedir ) || Q_stricmp( fs_path, GameInfo->gamedir ))
				Q_strncpy( GameInfo->gamedir, fs_path, sizeof( GameInfo->gamedir ));
		}
		else if( !Q_stricmp( token, "title" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->title );
		}
		else if( !Q_stricmp( token, "sp_entity" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->sp_entity );
		}
		else if( !Q_stricmp( token, "mp_entity" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->mp_entity );
		}
		else if( !Q_stricmp( token, "gamedll" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_dll );
		}
		else if( !Q_stricmp( token, "dllpath" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->dll_path );
		}
		else if( !Q_stricmp( token, "startmap" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->startmap );
			FS_StripExtension( GameInfo->startmap ); // HQ2:Amen has extension .bsp
		}
		else if( !Q_stricmp( token, "trainmap" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->trainmap );
			FS_StripExtension( GameInfo->trainmap ); // HQ2:Amen has extension .bsp
		}
		else if( !Q_stricmp( token, "url_info" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_url );
		}
		else if( !Q_stricmp( token, "url_update" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->update_url );
		}
		else if( !Q_stricmp( token, "date" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->date );
		}
		else if( !Q_stricmp( token, "type" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->type );
		}
		else if( !Q_stricmp( token, "version" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->version = Q_atof( token );
		}
		else if( !Q_stricmp( token, "size" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->size = Q_atoi( token );
		}
		else if( !Q_stricmp( token, "max_edicts" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->max_edicts = bound( 600, Q_atoi( token ), 4096 );
		}
		else if( !Q_stricmp( token, "max_tempents" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->max_tents = bound( 300, Q_atoi( token ), 2048 );
		}
		else if( !Q_stricmp( token, "max_beams" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->max_beams = bound( 64, Q_atoi( token ), 512 );
		}
		else if( !Q_stricmp( token, "max_particles" ))
		{
			pfile = COM_ParseFile( pfile, token );
			GameInfo->max_particles = bound( 1024, Q_atoi( token ), 32768 );
		}
		else if( !Q_stricmp( token, "gamemode" ))
		{
			pfile = COM_ParseFile( pfile, token );
			if( !Q_stricmp( token, "singleplayer_only" ))
				GameInfo->gamemode = 1;
			else if( !Q_stricmp( token, "multiplayer_only" ))
				GameInfo->gamemode = 2;
		}
		else if( !Q_strnicmp( token, "hull", 4 ))
		{
			int	hullNum = Q_atoi( token + 4 );

			if( hullNum < 0 || hullNum > 3 )
			{
				MsgDev( D_ERROR, "FS_ParseGameInfo: Invalid hull number %i. Ignored.\n", hullNum );
			}
			else
			{
				FS_ParseVector( &pfile, GameInfo->client_mins[hullNum], 3 );
				FS_ParseVector( &pfile, GameInfo->client_maxs[hullNum], 3 );
			}
		}
	}

	Mem_Free( afile );
	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 ) Q_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( !Q_stricmp( SI.games[i]->gamefolder, gs_basedir ))
			break;
	}

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

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

	Host_InitDecals ();	// reload decals
}

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

	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" );

	// ignore commandlineoption "-game" for other stuff
	if( host.type == HOST_NORMAL || host.type == HOST_DEDICATED )
	{
		stringlistinit( &dirs );
		listdirectory( &dirs, "./" );
		stringlistsort( &dirs );
		SI.numgames = 0;
	
		if( !Sys_GetParmFromCmdLine( "-game", gs_basedir ))
			Q_strcpy( gs_basedir, SI.ModuleName ); // default dir

		if( FS_CheckNastyPath( gs_basedir, true ))
		{
			MsgDev( D_ERROR, "FS_Init: invalid game directory \"%s\"\n", gs_basedir );		
			Q_strcpy( gs_basedir, SI.ModuleName ); // default dir
		}

		// validate directories
		for( i = 0; i < dirs.numstrings; i++ )
		{
			if( !Q_stricmp( SI.ModuleName, dirs.strings[i] ))
				hasDefaultDir = true;

			if( !Q_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 ) Q_strncpy( gs_basedir, SI.ModuleName, sizeof( gs_basedir )); // 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( Q_stricmp( ext, "" ) || (!Q_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 );
	}	
	MsgDev( D_NOTE, "FS_Init: done\n" );
}

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

/*
================
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] );

	Q_memset( &SI, 0, sizeof( sysinfo_t ));

	FS_ClearSearchPath(); // release all wad files too
	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( lseek( pack->handle, pfile->offset, SEEK_SET ) == -1 )
		return NULL;

	dup_handle = dup( pack->handle );

	if( dup_handle < 0 )
		return NULL;

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

	return file;
}

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

Look for a file in the filesystem only
==================
*/
qboolean 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, qboolean 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 = Q_stricmp( pak->files[middle].name, name );

				// Found it
				if( !diff )
				{
					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 );
			qboolean		anywadname = true;
			string		wadname, wadfolder;
			string		shortname;

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

			if( Q_strlen( wadname ))
			{
				FS_FileBase( wadname, wadname );
				Q_strncpy( wadfolder, wadname, sizeof( wadfolder ));
				FS_DefaultExtension( wadname, ".wad" );
				anywadname = false;
			}

			// make wadname from wad fullpath
			FS_FileBase( search->wad->filename, shortname );
			FS_DefaultExtension( shortname, ".wad" );

			// quick reject by wadname
			if( !anywadname && Q_stricmp( wadname, shortname ))
				continue;

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

			lump = W_FindLump( search->wad, shortname, type );
			if( lump )
			{
				if( index )
					*index = lump - search->wad->lumps;
				return search;
			}
		}
		else
		{
			char	netpath[MAX_SYSPATH];
			Q_sprintf( netpath, "%s%s", search->filename, name );
			if( FS_SysFileExists( netpath ))
			{
				if( index != NULL ) *index = -1;
				return search;
			}
		}
	}

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

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

		// search for environment path
		while( pEnvPath )
		{
			char *end = Q_strchr( pEnvPath, ';' );
			if( !end ) break;
			Q_strncpy( search->filename, pEnvPath, (end - pEnvPath) + 1 );
			Q_strcat( search->filename, "\\" );
			Q_snprintf( netpath, MAX_SYSPATH, "%s%s", search->filename, name );
			if( FS_SysFileExists( netpath ))
			{
				if( index != NULL ) *index = -1;
				return search;
			}
			pEnvPath += (end - pEnvPath) + 1; // move pointer
		}
	}

	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, qboolean gamedironly )
{
	searchpath_t	*search;
	int		pack_ind;

	search = FS_FindFile( filename, &pack_ind, 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];
		Q_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, qboolean gamedironly )
{
	if( host.type == HOST_NORMAL || host.type == HOST_DEDICATED )
          {
		// some stupid mappers used leading '/' or '\' in path to models or sounds
		if( filepath[0] == '/' || filepath[0] == '\\' ) filepath++;
          }

	if( FS_CheckNastyPath( filepath, false ))
		return NULL;

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

		// open the file on disk directly
		Q_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, gamedironly );
}

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

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

	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;
	fs_offset_t	nb;

	// 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;
		Q_memcpy( 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

	// 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, &((byte *)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;
			Q_memcpy( &((byte *)buffer)[done], file->buff, count );
			file->buff_ind = count;
			done += 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, Q_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_SYSPATH;
	char		*tempbuff;

	if( !file ) return 0;

	while( 1 )
	{
		tempbuff = (char *)Mem_Alloc( fs_mempool, buff_size );
		len = Q_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;
}

/*
====================
FS_Gets

Same as fgets
====================
*/
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 )
{
	// 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 );

	if( lseek( file->handle, file->offset + offset, SEEK_SET ) == -1 )
		return -1;
	file->position = offset;
	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
====================
*/
qboolean 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, qboolean gamedironly )
{
	file_t		*file;
	byte		*buf = NULL;
	fs_offset_t	filesize = 0;
	const char	*ext = FS_FileExtension( path );

	file = FS_Open( path, "rb", gamedironly );

	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, gamedironly );
	}

	if( filesizeptr )
		*filesizeptr = filesize;

	return buf;
}

/*
============
FS_OpenFile

Simply version of FS_Open
============
*/
file_t *FS_OpenFile( const char *path, fs_offset_t *filesizeptr, qboolean gamedironly )
{
	file_t	*file = FS_Open( path, "rb", gamedironly );

	if( filesizeptr )
	{
		if( file ) *filesizeptr = file->real_length;
		else *filesizeptr = 0;
	}
	return file;
}

void COM_FreeFile( void *buffer )
{
	if( buffer && Mem_IsAllocatedExt( fs_mempool, buffer ))
		Mem_Free( buffer ); 
}

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

The filename will be prefixed by the current game directory
============
*/
qboolean 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 = Q_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 + Q_strlen( path ) - 1;

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

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

Look for a file in the packages and in the filesystem
==================
*/
qboolean FS_FileExists( const char *filename, qboolean gamedironly )
{
	if( FS_FindFile( filename, NULL, gamedironly ))
		return true;
	return false;
}

/*
==================
FS_GetDiskPath

Build direct path for file in the filesystem
return NULL for file in pack
==================
*/
const char *FS_GetDiskPath( const char *name, qboolean gamedironly )
{
	int		index;
	searchpath_t	*search;
	
	search = FS_FindFile( name, &index, gamedironly );

	if( search )
	{
		if( index != -1 )
		{
			// file in pack or wad
			return NULL;
		}
		return va( "%s%s", search->filename, name );
	}
	return NULL;
}

/*
==================
FS_CheckForCrypt

return true if library is crypted
==================
*/
qboolean FS_CheckForCrypt( const char *dllname )
{
	file_t	*f;
	int	key;

	f = FS_Open( dllname, "rb", false );
	if( !f ) return false;

	FS_Seek( f, 64, SEEK_SET );	// skip first 64 bytes
	FS_Read( f, &key, sizeof( key ));
	FS_Close( f );

	return ( key == 0x12345678 ) ? true : false;
}

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

search for library, assume index is valid
only for internal use
==================
*/
dll_user_t *FS_FindLibrary( const char *dllname, qboolean directpath )
{
	string		dllpath;
	searchpath_t	*search;
	dll_user_t	*hInst;
	int		i, index;
	int		start = 0;

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

	fs_ext_path = directpath;

	// HACKHACK: remove absoulte path to valve folder
	if( !Q_strnicmp( dllname, "..\\valve\\", 9 ) || !Q_strnicmp( dllname, "../valve/", 9 ))
		start += 9;

	// replace all backward slashes
	for( i = 0; i < Q_strlen( dllname ); i++ )
	{
		if( dllname[i+start] == '\\' ) dllpath[i] = '/';
		else dllpath[i] = Q_tolower( dllname[i+start] );
	}
	dllpath[i] = '\0';
	FS_DefaultExtension( dllpath, ".dll" );	// apply ext if forget
	search = FS_FindFile( dllpath, &index, false );

	if( !search )
	{
		fs_ext_path = false;
		if( directpath ) return NULL;	// direct paths fails here
		// trying check also 'bin' folder for indirect paths
		Q_strncpy( dllpath, dllname, sizeof( dllpath ));
		search = FS_FindFile( dllpath, &index, false );
		if( !search ) return NULL;	// unable to find
	}

	// all done, create dll_user_t struct
	hInst = Mem_Alloc( host.mempool, sizeof( dll_user_t ));	

	// save dllname for debug purposes
	Q_strncpy( hInst->dllName, dllname, sizeof( hInst->dllName ));

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

	hInst->encrypted = FS_CheckForCrypt( dllpath );

	if( index < 0 && !hInst->encrypted )
	{
		Q_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
	{
		Q_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, qboolean gamedironly )
{
	file_t	*fp;
	int	length = 0;
	
	fp = FS_Open( filename, "rb", gamedironly );

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

/*
==================
FS_FileLength

return size of file in bytes
==================
*/
fs_offset_t FS_FileLength( file_t *f )
{
	if( !f ) return 0;
	return f->real_length;
}

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

return time of creation file in seconds
==================
*/
fs_offset_t FS_FileTime( const char *filename, qboolean gamedironly )
{
	searchpath_t	*search;
	int		pack_ind;
	
	search = FS_FindFile( filename, &pack_ind, gamedironly );
	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];

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

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

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

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

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

	COM_FixSlashes( oldpath );
	COM_FixSlashes( newpath );

	iRet = rename( oldpath, newpath );

	return (iRet == 0);
}

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

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

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

	Q_snprintf( real_path, sizeof( real_path ), "%s%s", fs_gamedir, path );
	COM_FixSlashes( real_path );
	iRet = remove( real_path );

	return (iRet == 0);
}

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

Allocate and fill a search structure with information on matching filenames.
===========
*/
search_t *FS_Search( const char *pattern, int caseinsensitive, int gamedironly )
{
	search_t		*search = NULL;
	searchpath_t	*searchpath;
	pack_t		*pak;
	wfile_t		*wad;
	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;
	}

	stringlistinit( &resultlist );
	stringlistinit( &dirlist );
	slash = Q_strrchr( pattern, '/' );
	backslash = Q_strrchr( pattern, '\\' );
	colon = Q_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 ) Q_memcpy( 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++ )
			{
				Q_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( !Q_strcmp( resultlist.strings[resultlistindex], temp ))
								break;
						}

						if( resultlistindex == resultlist.numstrings )
						{
							stringlistappend( &resultlist, 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 = Q_strrchr( temp, '/' );
					backslash = Q_strrchr( temp, '\\' );
					colon = Q_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 );
			qboolean	anywadname = true;
			string	wadfolder;

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

			if( Q_strlen( wadname ))
			{
				FS_FileBase( wadname, wadname );
				Q_strncpy( wadfolder, wadname, sizeof( wadfolder ));
				FS_DefaultExtension( wadname, ".wad" );
				anywadname = false;
			}

			// make wadname from wad fullpath
			FS_FileBase( searchpath->wad->filename, temp2 );
			FS_DefaultExtension( temp2, ".wad" );

			// quick reject by wadname
			if( !anywadname && Q_stricmp( wadname, temp2 ))
				continue;

			// look through all the wad file elements
			wad = searchpath->wad;
			for( i = 0; i < wad->numlumps; i++ )
			{
				// if type not matching, we already have no chance ...
				if( type != TYP_ANY && wad->lumps[i].type != type )
					continue;

				Q_strncpy( temp, wad->lumps[i].name, sizeof( temp ));
				while( temp[0] )
				{
					if( matchpattern( temp, wadpattern, true ))
					{
						for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
						{
							if( !Q_strcmp( resultlist.strings[resultlistindex], temp ))
								break;
						}

						if( resultlistindex == resultlist.numstrings )
						{
							// build path: wadname/lumpname.ext
							Q_snprintf( temp2, sizeof(temp2), "%s/%s", wadfolder, temp );
							FS_DefaultExtension( temp2, va(".%s", W_ExtFromType( wad->lumps[i].type ))); // make ext
							stringlistappend( &resultlist, 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 = Q_strrchr( temp, '/' );
					backslash = Q_strrchr( temp, '\\' );
					colon = Q_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
			Q_sprintf( netpath, "%s%s", searchpath->filename, basepath );
			stringlistinit( &dirlist );
			listdirectory( &dirlist, netpath );
			for( dirlistindex = 0; dirlistindex < dirlist.numstrings; dirlistindex++ )
			{
				Q_sprintf( temp, "%s%s", basepath, dirlist.strings[dirlistindex] );
				if( matchpattern( temp, (char *)pattern, true ))
				{
					for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
					{
						if( !Q_strcmp( resultlist.strings[resultlistindex], temp ))
							break;
					}

					if( resultlistindex == resultlist.numstrings )
					{
						stringlistappend( &resultlist, temp );
					}
				}
			}
			stringlistfreecontents( &dirlist );
		}
	}

	if( resultlist.numstrings )
	{
		stringlistsort( &resultlist );
		numfiles = resultlist.numstrings;
		numchars = 0;

		for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
			numchars += (int)Q_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 = numchars = 0;

		for( resultlistindex = 0; resultlistindex < resultlist.numstrings; resultlistindex++ )
		{
			size_t	textlen;

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

	Mem_Free( basepath );
	return 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[Q_strlen(fs_basedir) - 1] != '/' && fs_basedir[Q_strlen(fs_basedir) - 1] != '\\' )
		Q_strncat( fs_basedir, "/", sizeof( fs_basedir ));

	fs_searchpaths = NULL;
}

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

WADSYSTEM PRIVATE COMMON FUNCTIONS

=============================================================================
*/
// associate extension with wad type
static const wadtype_t wad_types[] =
{
{ "pal", TYP_QPAL	}, // palette
{ "lmp", TYP_QPIC	}, // quake1, hl pic
{ "fnt", TYP_QFONT	}, // hl qfonts
{ "mip", TYP_MIPTEX	}, // hl/q1 mip
{ "raw", TYP_RAW	}, // signed raw data
{ NULL,  TYP_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( !Q_strcmp( ext, "*" ) || !Q_strcmp( ext, "" ))
		return TYP_ANY;
	
	for( type = wad_types; type->ext; type++ )
	{
		if(!Q_stricmp( ext, type->ext ))
			return type->type;
	}
	return TYP_NONE;
}

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

	// we not known aboyt filetype, so match only by filename
	if( lumptype == TYP_NONE || lumptype == TYP_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	left, right, middle;

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

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

		middle = (left + right) / 2;
		diff = Q_stricmp( wad->lumps[middle].name, name );

		// Found it
		if( !diff )
		{
			if( matchtype == TYP_ANY || matchtype == wad->lumps[middle].type )
				return &wad->lumps[middle]; // found
			else break;
		}

		// if we're too far in the list
		if( diff > 0 )
			right = middle - 1;
		else left = middle + 1;
	}
	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 );
	tempname[16] = '\0'; // cutoff all other ...
	Q_strncpy( cleanname, tempname, 16 );

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

/*
====================
FS_AddFileToWad

Add a file to the list of files contained into a package
====================
*/
static dlumpinfo_t *W_AddFileToWad( const char *name, wfile_t *wad, int filepos, int packsize, int realsize, char type, char compression )
{
	int		left, right, middle;
	dlumpinfo_t	*plump;

	// look for the slot we should put that file into (binary search)
	left = 0;
	right = wad->numlumps - 1;

	while( left <= right )
	{
		int	diff;

		middle = ( left + right ) / 2;
		diff = Q_stricmp( wad->lumps[middle].name, name );

		// If we found the file, there's a problem
		if( !diff ) MsgDev( D_NOTE, "Wad %s contains the file %s several times\n", wad->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
	plump = &wad->lumps[left];
	memmove( plump + 1, plump, ( wad->numlumps - left ) * sizeof( *plump ));
	wad->numlumps++;

	Q_memcpy( plump->name, name, sizeof( plump->name ));
	plump->filepos = filepos;
	plump->disksize = realsize;
	plump->size = packsize;
	plump->compression = compression;

	// convert all qmip types to miptex
	if( type == TYP_QMIP )
		plump->type = TYP_MIPTEX;
	else plump->type = type;

	// check for Quake 'conchars' issues (only lmp loader supposed to read this lame pic)
	if( !Q_stricmp( plump->name, "conchars" ) && plump->type == TYP_QMIP )
		plump->type = TYP_QPIC; 

	return plump;
}

static qboolean W_ReadLumpTable( wfile_t *wad )
{
	size_t		lat_size;
	dlumpinfo_t	*srclumps;
	int		i, k, numlumps;

	// nothing to convert ?
	if( !wad || !wad->numlumps )
		return false;

	lat_size = wad->numlumps * sizeof( dlumpinfo_t );
	srclumps = (dlumpinfo_t *)Mem_Alloc( wad->mempool, lat_size );
	numlumps = wad->numlumps;
	wad->numlumps = 0;	// reset it

	if( read( wad->handle, srclumps, 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 < numlumps; i++ )
	{
		char	name[16];

		// cleanup lumpname
		Q_strnlwr( srclumps[i].name, name, sizeof( srclumps[i].name ));

		// check for '*' symbol issues
		k = Q_strlen( Q_strrchr( name, '*' ));
		if( k ) name[Q_strlen( name ) - k] = '!'; // quake1 issues (can't save images that contain '*' symbol)

		W_AddFileToWad( name, wad, srclumps[i].filepos, srclumps[i].size, srclumps[i].disksize, srclumps[i].type, srclumps[i].compression );
	}

	// release source lumps
	Mem_Free( srclumps );

	return true;
}

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

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

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

	if( lseek( wad->handle, lump->filepos, SEEK_SET ) == -1 )
	{
		MsgDev( D_ERROR, "W_ReadLump: %s is corrupted\n", lump->name );
		return NULL;
	}

	buf = (byte *)Mem_Alloc( wad->mempool, lump->disksize );
	size = read( wad->handle, buf, lump->disksize );
	if( size < lump->disksize )
	{
		MsgDev( D_WARN, "W_ReadLump: %s is probably corrupted\n", lump->name );
		Mem_Free( buf );
		return NULL;
	}

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

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

WADSYSTEM PUBLIC BASE FUNCTIONS

=============================================================================
*/
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 ));
	const char	*comment = "Generated by Xash WadLib. ";

	if( mode[0] == 'a' ) wad->handle = open( filename, O_RDWR|O_BINARY, 0x666 );
	else if( mode[0] == 'w' ) wad->handle = open( filename, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0x666 );
	else if( mode[0] == 'r' ) wad->handle = open( filename, O_RDONLY|O_BINARY, 0x666 );

	if( wad->handle < 0 )
	{
		W_Close( wad );
		MsgDev( D_ERROR, "W_Open: couldn't open %s\n", filename );
		return NULL;
	}

	// copy wad name
	Q_strncpy( wad->filename, filename, sizeof( wad->filename ));
	wad->mempool = Mem_AllocPool( filename );
	wad->filetime = FS_SysFileTime( filename );

	// 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 = wad->numlumps;
		hdr.infotableofs = sizeof( dwadinfo_t );
		write( wad->handle, &hdr, sizeof( hdr ));
		write( wad->handle, comment, Q_strlen( comment ) + 1 );
		wad->infotableofs = tell( wad->handle );
	}
	else if( mode[0] == 'r' || mode[0] == 'a' )
	{
		if( mode[0] == 'a' )
		{
			lseek( wad->handle, 0, SEEK_SET );
			wad->mode = O_APPEND;
		}

		if( read( wad->handle, &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 IDWAD2HEADER:
		case IDWAD3HEADER:
			break; // WAD2, WAD3 allow r\w mode
		default:
			MsgDev( D_ERROR, "W_Open: %s unknown wadtype\n", filename );
			W_Close( wad );
			return NULL;
		}

		wad->numlumps = 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 = header.infotableofs; // save infotableofs position
		if( lseek( wad->handle, wad->infotableofs, SEEK_SET ) == -1 )
		{
			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( read( wad->handle, 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
			lseek( wad->handle, wad->infotableofs, SEEK_SET );
		}
		else
		{
			// setup lump allocation table
			switch( header.ident )
			{
			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->handle >= 0 && ( wad->mode == O_APPEND || wad->mode == O_WRONLY ))
	{
		dwadinfo_t	hdr;

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

		lseek( wad->handle, 0, SEEK_SET );
		write( wad->handle, &hdr, sizeof( hdr ));
	}

	Mem_FreePool( &wad->mempool );
	if( wad->handle >= 0 ) close( wad->handle );	
	Mem_Free( wad ); // free himself
}

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

FILESYSTEM IMPLEMENTATION

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

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