fix a number of char types that should be int, to make them immune to

[divverent/darkplaces.git] / fs.c

/*
        DarkPlaces file system

        Copyright (C) 2003-2006 Mathieu Olivier

        This program is free software; you can redistribute it and/or
        modify it under the terms of the GNU General Public License
        as published by the Free Software Foundation; either version 2
        of the License, or (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

        See the GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program; if not, write to:

                Free Software Foundation, Inc.
                59 Temple Place - Suite 330
                Boston, MA  02111-1307, USA
*/

#include "quakedef.h"

#include <limits.h>
#include <fcntl.h>

#ifdef WIN32
# include <direct.h>
# include <io.h>
# include <shlobj.h>
#else
# include <pwd.h>
# include <sys/stat.h>
# include <unistd.h>
#endif

#include "fs.h"
#include "wad.h"

// Win32 requires us to add O_BINARY, but the other OSes don't have it
#ifndef O_BINARY
# define O_BINARY 0
#endif

// In case the system doesn't support the O_NONBLOCK flag
#ifndef O_NONBLOCK
# define O_NONBLOCK 0
#endif

// largefile support for Win32
#ifdef WIN32
# define lseek _lseeki64
#endif

#if _MSC_VER >= 1400
// suppress deprecated warnings
# include <sys/stat.h>
# include <share.h>
# define read _read
# define write _write
# define close _close
# define unlink _unlink
# define dup _dup
#endif

/*

All of Quake's data access is through a hierchal file system, but the contents
of the file system can be transparently merged from several sources.

The "base directory" is the path to the directory holding the quake.exe and
all game directories.  The sys_* files pass this to host_init in
quakeparms_t->basedir.  This can be overridden with the "-basedir" command
line parm to allow code debugging in a different directory.  The base
directory is only used during filesystem initialization.

The "game directory" is the first tree on the search path and directory that
all generated files (savegames, screenshots, demos, config files) will be
saved to.  This can be overridden with the "-game" command line parameter.
The game directory can never be changed while quake is executing.  This is a
precaution against having a malicious server instruct clients to write files
over areas they shouldn't.

*/


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

CONSTANTS

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

// Magic numbers of a ZIP file (big-endian format)
#define ZIP_DATA_HEADER 0x504B0304  // "PK\3\4"
#define ZIP_CDIR_HEADER 0x504B0102  // "PK\1\2"
#define ZIP_END_HEADER  0x504B0506  // "PK\5\6"

// Other constants for ZIP files
#define ZIP_MAX_COMMENTS_SIZE           ((unsigned short)0xFFFF)
#define ZIP_END_CDIR_SIZE                       22
#define ZIP_CDIR_CHUNK_BASE_SIZE        46
#define ZIP_LOCAL_CHUNK_BASE_SIZE       30

// Zlib constants (from zlib.h)
#define Z_SYNC_FLUSH    2
#define MAX_WBITS               15
#define Z_OK                    0
#define Z_STREAM_END    1
#define Z_STREAM_ERROR  (-2)
#define Z_DATA_ERROR    (-3)
#define Z_MEM_ERROR     (-4)
#define Z_BUF_ERROR     (-5)
#define ZLIB_VERSION    "1.2.3"

#define Z_BINARY 0
#define Z_DEFLATED 8
#define Z_MEMLEVEL_DEFAULT 8

#define Z_NULL 0
#define Z_DEFAULT_COMPRESSION (-1)
#define Z_NO_FLUSH 0
#define Z_SYNC_FLUSH 2
#define Z_FULL_FLUSH 3
#define Z_FINISH 4

// Uncomment the following line if the zlib DLL you have still uses
// the 1.1.x series calling convention on Win32 (WINAPI)
//#define ZLIB_USES_WINAPI


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

TYPES

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

// Zlib stream (from zlib.h)
// Warning: some pointers we don't use directly have
// been cast to "void*" for a matter of simplicity
typedef struct
{
        unsigned char                   *next_in;       // next input byte
        unsigned int    avail_in;       // number of bytes available at next_in
        unsigned long   total_in;       // total nb of input bytes read so far

        unsigned char                   *next_out;      // next output byte should be put there
        unsigned int    avail_out;      // remaining free space at next_out
        unsigned long   total_out;      // total nb of bytes output so far

        char                    *msg;           // last error message, NULL if no error
        void                    *state;         // not visible by applications

        void                    *zalloc;        // used to allocate the internal state
        void                    *zfree;         // used to free the internal state
        void                    *opaque;        // private data object passed to zalloc and zfree

        int                             data_type;      // best guess about the data type: ascii or binary
        unsigned long   adler;          // adler32 value of the uncompressed data
        unsigned long   reserved;       // reserved for future use
} z_stream;


// inside a package (PAK or PK3)
#define QFILE_FLAG_PACKED (1 << 0)
// file is compressed using the deflate algorithm (PK3 only)
#define QFILE_FLAG_DEFLATED (1 << 1)
// file is actually already loaded data
#define QFILE_FLAG_DATA (1 << 2)

#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
        unsigned char           input [FILE_BUFF_SIZE];
} ztoolkit_t;

struct qfile_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

        // Contents buffer
        fs_offset_t             buff_ind, buff_len;             // buffer current index and length
        unsigned char                   buff [FILE_BUFF_SIZE];

        // For zipped files
        ztoolkit_t*             ztk;

        // for data files
        const unsigned char *data;
};


// ------ PK3 files on disk ------ //

// You can get the complete ZIP format description from PKWARE website

typedef struct pk3_endOfCentralDir_s
{
        unsigned int signature;
        unsigned short disknum;
        unsigned short cdir_disknum;    // number of the disk with the start of the central directory
        unsigned short localentries;    // number of entries in the central directory on this disk
        unsigned short nbentries;               // total number of entries in the central directory on this disk
        unsigned int cdir_size;                 // size of the central directory
        unsigned int cdir_offset;               // with respect to the starting disk number
        unsigned short comment_size;
} pk3_endOfCentralDir_t;


// ------ PAK files on disk ------ //
typedef struct dpackfile_s
{
        char name[56];
        int filepos, filelen;
} dpackfile_t;

typedef struct dpackheader_s
{
        char id[4];
        int dirofs;
        int dirlen;
} dpackheader_t;


// Packages in memory
// the offset in packfile_t is the true contents offset
#define PACKFILE_FLAG_TRUEOFFS (1 << 0)
// file compressed using the deflate algorithm
#define PACKFILE_FLAG_DEFLATED (1 << 1)
// file is a symbolic link
#define PACKFILE_FLAG_SYMLINK (1 << 2)

typedef struct packfile_s
{
        char name [MAX_QPATH];
        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_OSPATH];
        char shortname [MAX_QPATH];
        int handle;
        int ignorecase;  // PK3 ignores case
        int numfiles;
        packfile_t *files;
} pack_t;


// Search paths for files (including packages)
typedef struct searchpath_s
{
        // only one of filename / pack will be used
        char filename[MAX_OSPATH];
        pack_t *pack;
        struct searchpath_s *next;
} searchpath_t;


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

FUNCTION PROTOTYPES

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

void FS_Dir_f(void);
void FS_Ls_f(void);

static searchpath_t *FS_FindFile (const char *name, int* index, qboolean quiet);
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);


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

VARIABLES

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

mempool_t *fs_mempool;

searchpath_t *fs_searchpaths = NULL;

#define MAX_FILES_IN_PACK       65536

char fs_gamedir[MAX_OSPATH];
char fs_basedir[MAX_OSPATH];

// list of active game directories (empty if not running a mod)
int fs_numgamedirs = 0;
char fs_gamedirs[MAX_GAMEDIRS][MAX_QPATH];

cvar_t scr_screenshot_name = {0, "scr_screenshot_name","dp", "prefix name for saved screenshots (changes based on -game commandline, as well as which game mode is running)"};
cvar_t fs_empty_files_in_pack_mark_deletions = {0, "fs_empty_files_in_pack_mark_deletions", "0", "if enabled, empty files in a pak/pk3 count as not existing but cancel the search in further packs, effectively allowing patch pak/pk3 files to 'delete' files"};


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

PRIVATE FUNCTIONS - PK3 HANDLING

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

// Functions exported from zlib
#if defined(WIN32) && defined(ZLIB_USES_WINAPI)
# define ZEXPORT WINAPI
#else
# define ZEXPORT
#endif

static int (ZEXPORT *qz_inflate) (z_stream* strm, int flush);
static int (ZEXPORT *qz_inflateEnd) (z_stream* strm);
static int (ZEXPORT *qz_inflateInit2_) (z_stream* strm, int windowBits, const char *version, int stream_size);
static int (ZEXPORT *qz_inflateReset) (z_stream* strm);
static int (ZEXPORT *qz_deflateInit2_) (z_stream* strm, int level, int method, int windowBits, int memLevel, int strategy, const char *version, int stream_size);
static int (ZEXPORT *qz_deflateEnd) (z_stream* strm);
static int (ZEXPORT *qz_deflate) (z_stream* strm, int flush);

#define qz_inflateInit2(strm, windowBits) \
        qz_inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
#define qz_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
        qz_deflateInit2_((strm), (level), (method), (windowBits), (memLevel), (strategy), ZLIB_VERSION, sizeof(z_stream))

//        qz_deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream))

static dllfunction_t zlibfuncs[] =
{
        {"inflate",                     (void **) &qz_inflate},
        {"inflateEnd",          (void **) &qz_inflateEnd},
        {"inflateInit2_",       (void **) &qz_inflateInit2_},
        {"inflateReset",        (void **) &qz_inflateReset},
        {"deflateInit2_",   (void **) &qz_deflateInit2_},
        {"deflateEnd",      (void **) &qz_deflateEnd},
        {"deflate",         (void **) &qz_deflate},
        {NULL, NULL}
};

// Handle for Zlib DLL
static dllhandle_t zlib_dll = NULL;

#ifdef WIN32
static HRESULT (WINAPI *qSHGetFolderPath) (HWND hwndOwner, int nFolder, HANDLE hToken, DWORD dwFlags, LPTSTR pszPath);
static dllfunction_t shfolderfuncs[] =
{
        {"SHGetFolderPathA", (void **) &qSHGetFolderPath},
        {NULL, NULL}
};
static dllhandle_t shfolder_dll = NULL;
#endif

/*
====================
PK3_CloseLibrary

Unload the Zlib DLL
====================
*/
void PK3_CloseLibrary (void)
{
        Sys_UnloadLibrary (&zlib_dll);
}


/*
====================
PK3_OpenLibrary

Try to load the Zlib DLL
====================
*/
qboolean PK3_OpenLibrary (void)
{
        const char* dllnames [] =
        {
#if defined(WIN64)
                "zlib64.dll",
#elif defined(WIN32)
# ifdef ZLIB_USES_WINAPI
                "zlibwapi.dll",
                "zlib.dll",
# else
                "zlib1.dll",
# endif
#elif defined(MACOSX)
                "libz.dylib",
#else
                "libz.so.1",
                "libz.so",
#endif
                NULL
        };

        // Already loaded?
        if (zlib_dll)
                return true;

        // Load the DLL
        return Sys_LoadLibrary (dllnames, &zlib_dll, zlibfuncs);
}

/*
====================
FS_HasZlib

See if zlib is available
====================
*/
qboolean FS_HasZlib(void)
{
        PK3_OpenLibrary(); // to be safe
        return (zlib_dll != 0);
}

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

Extract the end of the central directory from a PK3 package
====================
*/
qboolean PK3_GetEndOfCentralDir (const char *packfile, int packhandle, pk3_endOfCentralDir_t *eocd)
{
        fs_offset_t filesize, maxsize;
        unsigned char *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 < ZIP_MAX_COMMENTS_SIZE + ZIP_END_CDIR_SIZE)
                maxsize = filesize;
        else
                maxsize = ZIP_MAX_COMMENTS_SIZE + ZIP_END_CDIR_SIZE;
        buffer = (unsigned char *)Mem_Alloc (tempmempool, 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 (BuffBigLong (ptr) != ZIP_END_HEADER)
        {
                if (ind == maxsize)
                {
                        Mem_Free (buffer);
                        return false;
                }

                ind++;
                ptr--;
        }

        memcpy (eocd, ptr, ZIP_END_CDIR_SIZE);
        eocd->signature = LittleLong (eocd->signature);
        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 pk3_endOfCentralDir_t *eocd)
{
        unsigned char *central_dir, *ptr;
        unsigned int ind;
        fs_offset_t remaining;

        // Load the central directory in memory
        central_dir = (unsigned char *)Mem_Alloc (tempmempool, eocd->cdir_size);
        lseek (pack->handle, eocd->cdir_offset, SEEK_SET);
        if(read (pack->handle, central_dir, eocd->cdir_size) != (ssize_t) eocd->cdir_size)
        {
                Mem_Free (central_dir);
                return -1;
        }

        // 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 (BuffBigLong (ptr) != ZIP_CDIR_HEADER)
                {
                        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 (?))
                //
                // LordHavoc: bit 3 would be a problem if we were scanning the archive
                // but is not a problem in the central directory where the values are
                // always real.
                //
                // bit 3 seems to always be set by the standard Mac OSX zip maker
                //
                // 2nd uint8 : external file attributes
                //    Check bits 3 (file is a directory) and 5 (file is a volume (?))
                if ((ptr[8] & 0x21) == 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);
                                memcpy (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]);

                                switch(ptr[5]) // C_VERSION_MADE_BY_1
                                {
                                        case 3: // UNIX_
                                        case 2: // VMS_
                                        case 16: // BEOS_
                                                if((BuffLittleShort(&ptr[40]) & 0120000) == 0120000)
                                                        // can't use S_ISLNK here, as this has to compile on non-UNIX too
                                                        flags |= PACKFILE_FLAG_SYMLINK;
                                                break;
                                }

                                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;
        pk3_endOfCentralDir_t eocd;
        pack_t *pack;
        int real_nb_files;

#if _MSC_VER >= 1400
        _sopen_s(&packhandle, packfile, O_RDONLY | O_BINARY, _SH_DENYNO, _S_IREAD | _S_IWRITE);
#else
        packhandle = open (packfile, O_RDONLY | O_BINARY);
#endif
        if (packhandle < 0)
                return NULL;

        if (! PK3_GetEndOfCentralDir (packfile, packhandle, &eocd))
        {
                Con_Printf ("%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)
        {
                Con_Printf ("%s is a multi-volume ZIP archive\n", packfile);
                close(packhandle);
                return NULL;
        }

        // We only need to do this test if MAX_FILES_IN_PACK is lesser than 65535
        // since eocd.nbentries is an unsigned 16 bits integer
#if MAX_FILES_IN_PACK < 65535
        if (eocd.nbentries > MAX_FILES_IN_PACK)
        {
                Con_Printf ("%s contains too many files (%hu)\n", packfile, eocd.nbentries);
                close(packhandle);
                return NULL;
        }
#endif

        // Create a package structure in memory
        pack = (pack_t *)Mem_Alloc(fs_mempool, sizeof (pack_t));
        pack->ignorecase = true; // PK3 ignores case
        strlcpy (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));

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

        Con_Printf("Added packfile %s (%i files)\n", packfile, real_nb_files);
        return pack;
}


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

Find where the true file data offset is
====================
*/
qboolean PK3_GetTrueFileOffset (packfile_t *pfile, pack_t *pack)
{
        unsigned char 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 || BuffBigLong (buffer) != ZIP_DATA_HEADER)
        {
                Con_Printf ("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;
}


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

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 (*strcmp_funct) (const char* str1, const char* str2);
        int left, right, middle;
        packfile_t *pfile;

        strcmp_funct = pack->ignorecase ? strcasecmp : strcmp;

        // 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 = strcmp_funct (pack->files[middle].name, name);

                // If we found the file, there's a problem
                if (!diff)
                        Con_Printf ("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++;

        strlcpy (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_OpenRealFile.
============
*/
void FS_CreatePath (char *path)
{
        char *ofs, save;

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


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

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

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


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

#if _MSC_VER >= 1400
        _sopen_s(&packhandle, packfile, O_RDONLY | O_BINARY, _SH_DENYNO, _S_IREAD | _S_IWRITE);
#else
        packhandle = open (packfile, O_RDONLY | O_BINARY);
#endif
        if (packhandle < 0)
                return NULL;
        if(read (packhandle, (void *)&header, sizeof(header)) != sizeof(header))
        {
                Con_Printf ("%s is not a packfile\n", packfile);
                close(packhandle);
                return NULL;
        }
        if (memcmp(header.id, "PACK", 4))
        {
                Con_Printf ("%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(dpackfile_t))
        {
                Con_Printf ("%s has an invalid directory size\n", packfile);
                close(packhandle);
                return NULL;
        }

        numpackfiles = header.dirlen / sizeof(dpackfile_t);

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

        info = (dpackfile_t *)Mem_Alloc(tempmempool, sizeof(*info) * numpackfiles);
        lseek (packhandle, header.dirofs, SEEK_SET);
        if(header.dirlen != read (packhandle, (void *)info, header.dirlen))
        {
                Con_Printf("%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));
        pack->ignorecase = false; // PAK is case sensitive
        strlcpy (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);

        Con_Printf("Added 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, const char *shortname, qboolean *already_loaded, qboolean keep_plain_dirs)
{
        searchpath_t *search;
        pack_t *pak = NULL;
        const char *ext = FS_FileExtension(pakfile);

        for(search = fs_searchpaths; search; search = search->next)
        {
                if(search->pack && !strcasecmp(search->pack->filename, pakfile))
                {
                        if(already_loaded)
                                *already_loaded = true;
                        return true; // already loaded
                }
        }

        if(already_loaded)
                *already_loaded = false;

        if(!strcasecmp(ext, "pak"))
                pak = FS_LoadPackPAK (pakfile);
        else if(!strcasecmp(ext, "pk3"))
                pak = FS_LoadPackPK3 (pakfile);
        else
                Con_Printf("\"%s\" does not have a pack extension\n", pakfile);

        if (pak)
        {
                strlcpy(pak->shortname, shortname, sizeof(pak->shortname));
                //Con_DPrintf("  Registered pack with short name %s\n", shortname);
                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;
                                for(;;)
                                {
                                        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;
                                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;
                                insertion_point->next = search;
                        }
                }
                else
                {
                        search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
                        search->pack = pak;
                        search->next = fs_searchpaths;
                        fs_searchpaths = search;
                }
                return true;
        }
        else
        {
                Con_Printf("unable to load pak \"%s\"\n", pakfile);
                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.
================
*/
qboolean FS_AddPack(const char *pakfile, qboolean *already_loaded, qboolean keep_plain_dirs)
{
        char fullpath[MAX_QPATH];
        int index;
        searchpath_t *search;

        if(already_loaded)
                *already_loaded = false;

        // then find the real name...
        search = FS_FindFile(pakfile, &index, true);
        if(!search || search->pack)
        {
                Con_Printf("could not find pak \"%s\"\n", pakfile);
                return false;
        }

        dpsnprintf(fullpath, sizeof(fullpath), "%s%s", search->filename, pakfile);

        return FS_AddPack_Fullpath(fullpath, pakfile, already_loaded, keep_plain_dirs);
}


/*
================
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 i;
        stringlist_t list;
        searchpath_t *search;

        strlcpy (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 (!strcasecmp(FS_FileExtension(list.strings[i]), "pak"))
                {
                        FS_AddPack_Fullpath(list.strings[i], list.strings[i] + strlen(dir), NULL, false);
                }
        }

        // add any PK3 package in the directory
        for (i = 0;i < list.numstrings;i++)
        {
                if (!strcasecmp(FS_FileExtension(list.strings[i]), "pk3"))
                {
                        FS_AddPack_Fullpath(list.strings[i], list.strings[i] + strlen(dir), 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));
        strlcpy (search->filename, dir, sizeof (search->filename));
        search->next = fs_searchpaths;
        fs_searchpaths = search;
}


/*
================
FS_AddGameHierarchy
================
*/
void FS_AddGameHierarchy (const char *dir)
{
        int i;
        char userdir[MAX_QPATH];
#ifdef WIN32
        TCHAR mydocsdir[MAX_PATH + 1];
#if _MSC_VER >= 1400
        size_t homedirlen;
#endif
#endif
        char *homedir;

        // Add the common game directory
        FS_AddGameDirectory (va("%s%s/", fs_basedir, dir));

        *userdir = 0;

        // Add the personal game directory
#ifdef WIN32
        if(qSHGetFolderPath && (qSHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, mydocsdir) == S_OK))
        {
                dpsnprintf(userdir, sizeof(userdir), "%s/My Games/%s/", mydocsdir, gameuserdirname);
                Con_DPrintf("Obtained personal directory %s from SHGetFolderPath\n", userdir);
        }
        else
        {
                // use the environment
#if _MSC_VER >= 1400
                _dupenv_s (&homedir, &homedirlen, "USERPROFILE");
#else
                homedir = getenv("USERPROFILE");
#endif

                if(homedir)
                {
                        dpsnprintf(userdir, sizeof(userdir), "%s/My Documents/My Games/%s/", homedir, gameuserdirname);
#if _MSC_VER >= 1400
                        free(homedir);
#endif
                        Con_DPrintf("Obtained personal directory %s from environment\n", userdir);
                }
                else
                        *userdir = 0; // just to make sure it hasn't been written to by SHGetFolderPath returning failure
        }

        if(!*userdir)
                Con_DPrintf("Could not obtain home directory; not supporting -mygames\n");
#else
        homedir = getenv ("HOME");
        if(homedir)
                dpsnprintf(userdir, sizeof(userdir), "%s/.%s/", homedir, gameuserdirname);

        if(!*userdir)
                Con_DPrintf("Could not obtain home directory; assuming -nohome\n");
#endif


#ifdef WIN32
        if(!COM_CheckParm("-mygames"))
        {
#if _MSC_VER >= 1400
                int fd;
                _sopen_s(&fd, va("%s%s/config.cfg", fs_basedir, dir), O_WRONLY | O_CREAT, _SH_DENYNO, _S_IREAD | _S_IWRITE); // note: no O_TRUNC here!
#else
                int fd = open (va("%s%s/config.cfg", fs_basedir, dir), O_WRONLY | O_CREAT, 0666); // note: no O_TRUNC here!
#endif
                if(fd >= 0)
                {
                        close(fd);
                        *userdir = 0; // we have write access to the game dir, so let's use it
                }
        }
#endif

        if(COM_CheckParm("-nohome"))
                *userdir = 0;

        if((i = COM_CheckParm("-userdir")) && i < com_argc - 1)
                dpsnprintf(userdir, sizeof(userdir), "%s/", com_argv[i+1]);

        if (*userdir)
                FS_AddGameDirectory(va("%s%s/", userdir, dir));
}


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

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

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


/*
================
FS_ClearSearchPath
================
*/
void FS_ClearSearchPath (void)
{
        // unload all packs and directory information, close all pack files
        // (if a qfile is still reading a pack it won't be harmed because it used
        //  dup() to get its own handle already)
        while (fs_searchpaths)
        {
                searchpath_t *search = fs_searchpaths;
                fs_searchpaths = search->next;
                if (search->pack)
                {
                        // close the file
                        close(search->pack->handle);
                        // free any memory associated with it
                        if (search->pack->files)
                                Mem_Free(search->pack->files);
                        Mem_Free(search->pack);
                }
                Mem_Free(search);
        }
}


/*
================
FS_Rescan
================
*/
void FS_Rescan (void)
{
        int i;
        qboolean fs_modified = false;

        FS_ClearSearchPath();

        // add the game-specific paths
        // gamedirname1 (typically id1)
        FS_AddGameHierarchy (gamedirname1);
        // update the com_modname (used for server info)
        strlcpy(com_modname, gamedirname1, sizeof(com_modname));

        // add the game-specific path, if any
        // (only used for mission packs and the like, which should set fs_modified)
        if (gamedirname2)
        {
                fs_modified = true;
                FS_AddGameHierarchy (gamedirname2);
        }

        // -game <gamedir>
        // Adds basedir/gamedir as an override game
        // LordHavoc: now supports multiple -game directories
        // set the com_modname (reported in server info)
        for (i = 0;i < fs_numgamedirs;i++)
        {
                fs_modified = true;
                FS_AddGameHierarchy (fs_gamedirs[i]);
                // update the com_modname (used server info)
                strlcpy (com_modname, fs_gamedirs[i], sizeof (com_modname));
        }

        // set the default screenshot name to either the mod name or the
        // gamemode screenshot name
        if (strcmp(com_modname, gamedirname1))
                Cvar_SetQuick (&scr_screenshot_name, com_modname);
        else
                Cvar_SetQuick (&scr_screenshot_name, gamescreenshotname);

        // If "-condebug" is in the command line, remove the previous log file
        if (COM_CheckParm ("-condebug") != 0)
                unlink (va("%s/qconsole.log", fs_gamedir));

        // look for the pop.lmp file and set registered to true if it is found
        if ((gamemode == GAME_NORMAL || gamemode == GAME_HIPNOTIC || gamemode == GAME_ROGUE) && !FS_FileExists("gfx/pop.lmp"))
        {
                if (fs_modified)
                        Con_Print("Playing shareware version, with modification.\nwarning: most mods require full quake data.\n");
                else
                        Con_Print("Playing shareware version.\n");
        }
        else
        {
                Cvar_Set ("registered", "1");
                if (gamemode == GAME_NORMAL || gamemode == GAME_HIPNOTIC || gamemode == GAME_ROGUE)
                        Con_Print("Playing registered version.\n");
        }

        // unload all wads so that future queries will return the new data
        W_UnloadAll();
}

void FS_Rescan_f(void)
{
        FS_Rescan();
}

/*
================
FS_ChangeGameDirs
================
*/
extern void Host_SaveConfig (void);
extern void Host_LoadConfig_f (void);
qboolean FS_ChangeGameDirs(int numgamedirs, char gamedirs[][MAX_QPATH], qboolean complain, qboolean failmissing)
{
        int i;

        if (fs_numgamedirs == numgamedirs)
        {
                for (i = 0;i < numgamedirs;i++)
                        if (strcasecmp(fs_gamedirs[i], gamedirs[i]))
                                break;
                if (i == numgamedirs)
                        return true; // already using this set of gamedirs, do nothing
        }

        if (numgamedirs > MAX_GAMEDIRS)
        {
                if (complain)
                        Con_Printf("That is too many gamedirs (%i > %i)\n", numgamedirs, MAX_GAMEDIRS);
                return false; // too many gamedirs
        }

        for (i = 0;i < numgamedirs;i++)
        {
                // if string is nasty, reject it
                if(FS_CheckNastyPath(gamedirs[i], true))
                {
                        if (complain)
                                Con_Printf("Nasty gamedir name rejected: %s\n", gamedirs[i]);
                        return false; // nasty gamedirs
                }
        }

        for (i = 0;i < numgamedirs;i++)
        {
                if (!FS_CheckGameDir(gamedirs[i]) && failmissing)
                {
                        if (complain)
                                Con_Printf("Gamedir missing: %s%s/\n", fs_basedir, gamedirs[i]);
                        return false; // missing gamedirs
                }
        }

        Host_SaveConfig();

        fs_numgamedirs = numgamedirs;
        for (i = 0;i < fs_numgamedirs;i++)
                strlcpy(fs_gamedirs[i], gamedirs[i], sizeof(fs_gamedirs[i]));

        // reinitialize filesystem to detect the new paks
        FS_Rescan();

        // exec the new config
        Host_LoadConfig_f();

        // unload all sounds so they will be reloaded from the new files as needed
        S_UnloadAllSounds_f();

        // reinitialize renderer (this reloads hud/console background/etc)
        R_Modules_Restart();

        return true;
}

/*
================
FS_GameDir_f
================
*/
void FS_GameDir_f (void)
{
        int i;
        int numgamedirs;
        char gamedirs[MAX_GAMEDIRS][MAX_QPATH];

        if (Cmd_Argc() < 2)
        {
                Con_Printf("gamedirs active:");
                for (i = 0;i < fs_numgamedirs;i++)
                        Con_Printf(" %s", fs_gamedirs[i]);
                Con_Printf("\n");
                return;
        }

        numgamedirs = Cmd_Argc() - 1;
        if (numgamedirs > MAX_GAMEDIRS)
        {
                Con_Printf("Too many gamedirs (%i > %i)\n", numgamedirs, MAX_GAMEDIRS);
                return;
        }

        for (i = 0;i < numgamedirs;i++)
                strlcpy(gamedirs[i], Cmd_Argv(i+1), sizeof(gamedirs[i]));

        if ((cls.state == ca_connected && !cls.demoplayback) || sv.active)
        {
                // actually, changing during game would work fine, but would be stupid
                Con_Printf("Can not change gamedir while client is connected or server is running!\n");
                return;
        }

        // halt demo playback to close the file
        CL_Disconnect();

        FS_ChangeGameDirs(numgamedirs, gamedirs, true, true);
}


/*
================
FS_CheckGameDir
================
*/
qboolean FS_CheckGameDir(const char *gamedir)
{
        qboolean success;
        stringlist_t list;
        stringlistinit(&list);
        listdirectory(&list, va("%s%s/", fs_basedir, gamedir), "");
        success = list.numstrings > 0;
        stringlistfreecontents(&list);
        return success;
}


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

#ifdef WIN32
        const char* dllnames [] =
        {
                "shfolder.dll",  // IE 4, or Win NT and higher
                NULL
        };
        Sys_LoadLibrary(dllnames, &shfolder_dll, shfolderfuncs);
        // don't care for the result; if it fails, %USERPROFILE% will be used instead
#endif

        fs_mempool = Mem_AllocPool("file management", 0, NULL);

        strlcpy(fs_gamedir, "", sizeof(fs_gamedir));

// If the base directory is explicitly defined by the compilation process
#ifdef DP_FS_BASEDIR
        strlcpy(fs_basedir, DP_FS_BASEDIR, sizeof(fs_basedir));
#else
        strlcpy(fs_basedir, "", sizeof(fs_basedir));

#ifdef MACOSX
        // FIXME: is there a better way to find the directory outside the .app?
        if (strstr(com_argv[0], ".app/"))
        {
                char *split;

                split = strstr(com_argv[0], ".app/");
                while (split > com_argv[0] && *split != '/')
                        split--;
                strlcpy(fs_basedir, com_argv[0], sizeof(fs_basedir));
                fs_basedir[split - com_argv[0]] = 0;
        }
#endif
#endif

        PK3_OpenLibrary ();

        // -basedir <path>
        // Overrides the system supplied base directory (under GAMENAME)
// COMMANDLINEOPTION: Filesystem: -basedir <path> chooses what base directory the game data is in, inside this there should be a data directory for the game (for example id1)
        i = COM_CheckParm ("-basedir");
        if (i && i < com_argc-1)
        {
                strlcpy (fs_basedir, com_argv[i+1], sizeof (fs_basedir));
                i = (int)strlen (fs_basedir);
                if (i > 0 && (fs_basedir[i-1] == '\\' || fs_basedir[i-1] == '/'))
                        fs_basedir[i-1] = 0;
        }

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

        if (!FS_CheckGameDir(gamedirname1))
                Con_Printf("WARNING: base gamedir %s%s/ not found!\n", fs_basedir, gamedirname1);

        if (gamedirname2 && !FS_CheckGameDir(gamedirname2))
                Con_Printf("WARNING: base gamedir %s%s/ not found!\n", fs_basedir, gamedirname2);

        // -game <gamedir>
        // Adds basedir/gamedir as an override game
        // LordHavoc: now supports multiple -game directories
        for (i = 1;i < com_argc && fs_numgamedirs < MAX_GAMEDIRS;i++)
        {
                if (!com_argv[i])
                        continue;
                if (!strcmp (com_argv[i], "-game") && i < com_argc-1)
                {
                        i++;
                        if (FS_CheckNastyPath(com_argv[i], true))
                                Sys_Error("-game %s%s/ is a dangerous/non-portable path\n", fs_basedir, com_argv[i]);
                        if (!FS_CheckGameDir(com_argv[i]))
                                Con_Printf("WARNING: -game %s%s/ not found!\n", fs_basedir, com_argv[i]);
                        // add the gamedir to the list of active gamedirs
                        strlcpy (fs_gamedirs[fs_numgamedirs], com_argv[i], sizeof(fs_gamedirs[fs_numgamedirs]));
                        fs_numgamedirs++;
                }
        }

        // generate the searchpath
        FS_Rescan();
}

void FS_Init_Commands(void)
{
        Cvar_RegisterVariable (&scr_screenshot_name);
        Cvar_RegisterVariable (&fs_empty_files_in_pack_mark_deletions);

        Cmd_AddCommand ("gamedir", FS_GameDir_f, "changes active gamedir list (can take multiple arguments), not including base directory (example usage: gamedir ctf)");
        Cmd_AddCommand ("fs_rescan", FS_Rescan_f, "rescans filesystem for new pack archives and any other changes");
        Cmd_AddCommand ("path", FS_Path_f, "print searchpath (game directories and archives)");
        Cmd_AddCommand ("dir", FS_Dir_f, "list files in searchpath matching an * filename pattern, one per line");
        Cmd_AddCommand ("ls", FS_Ls_f, "list files in searchpath matching an * filename pattern, multiple per line");
}

/*
================
FS_Shutdown
================
*/
void FS_Shutdown (void)
{
        // close all pack files and such
        // (hopefully there aren't any other open files, but they'll be cleaned up
        //  by the OS anyway)
        FS_ClearSearchPath();
        Mem_FreePool (&fs_mempool);

#ifdef WIN32
        Sys_UnloadLibrary (&shfolder_dll);
#endif
}

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

Internal function used to create a qfile_t and open the relevant non-packed file on disk
====================
*/
static qfile_t* FS_SysOpen (const char* filepath, const char* mode, qboolean nonblocking)
{
        qfile_t* file;
        int mod, opt;
        unsigned int 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:
                        Con_Printf ("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:
                                Con_Printf ("FS_SysOpen(%s, %s): unknown character in mode (%c)\n",
                                                        filepath, mode, mode[ind]);
                }
        }

        if (nonblocking)
                opt |= O_NONBLOCK;

        file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
        memset (file, 0, sizeof (*file));
        file->ungetc = EOF;

#if _MSC_VER >= 1400
        _sopen_s(&file->handle, filepath, mod | opt, _SH_DENYNO, _S_IREAD | _S_IWRITE);
#else
        file->handle = open (filepath, mod | opt, 0666);
#endif
        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
===========
*/
qfile_t *FS_OpenPackedFile (pack_t* pack, int pack_ind)
{
        packfile_t *pfile;
        int dup_handle;
        qfile_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;

        // No Zlib DLL = no compressed files
        if (!zlib_dll && (pfile->flags & PACKFILE_FLAG_DEFLATED))
        {
                Con_Printf("WARNING: can't open the compressed file %s\n"
                                        "You need the Zlib DLL to use compressed files\n",
                                        pfile->name);
                return NULL;
        }

        // LordHavoc: lseek affects all duplicates of a handle so we do it before
        // the dup() call to avoid having to close the dup_handle on error here
        if (lseek (pack->handle, pfile->offset, SEEK_SET) == -1)
        {
                Con_Printf ("FS_OpenPackedFile: can't lseek to %s in %s (offset: %d)\n",
                                        pfile->name, pack->filename, (int) pfile->offset);
                return NULL;
        }

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

        file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
        memset (file, 0, sizeof (*file));
        file->handle = dup_handle;
        file->flags = QFILE_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 |= QFILE_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;

                /* From Zlib's "unzip.c":
                 *
                 * windowBits is passed < 0 to tell that there is no zlib header.
                 * Note that in this case inflate *requires* an extra "dummy" byte
                 * after the compressed stream in order to complete decompression and
                 * return Z_STREAM_END.
                 * In unzip, i don't wait absolutely Z_STREAM_END because I known the
                 * size of both compressed and uncompressed data
                 */
                if (qz_inflateInit2 (&ztk->zstream, -MAX_WBITS) != Z_OK)
                {
                        Con_Printf ("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_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;

        // Windows: don't allow \ in filenames (windows-only), period.
        // (on Windows \ is a directory separator, but / is also supported)
        if (strstr(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 (strstr(path, ":"))
                return 1; // non-portable attempt to go to root of drive

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

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

        // Windows and UNIXes: don't allow absolute paths
        if (path[0] == '/')
                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 (strchr(path, '.'))
        {
                if (isgamedir)
                {
                        // gamedir is entirely path elements, so simply forbid . entirely
                        return 2;
                }
                if (strchr(path, '.') < strrchr(path, '/'))
                        return 2; // possible attempt to go outside the game directory
        }

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

        // all: forbid leading dot on any filename for any reason
        if (strstr(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_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 quiet)
{
        searchpath_t *search;
        pack_t *pak;

        // search through the path, one element at a time
        for (search = fs_searchpaths;search;search = search->next)
        {
                // is the element a pak file?
                if (search->pack)
                {
                        int (*strcmp_funct) (const char* str1, const char* str2);
                        int left, right, middle;

                        pak = search->pack;
                        strcmp_funct = pak->ignorecase ? strcasecmp : strcmp;

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

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

                                // Found it
                                if (!diff)
                                {
                                        if (fs_empty_files_in_pack_mark_deletions.integer && pak->files[middle].realsize == 0)
                                        {
                                                // yes, but the first one is empty so we treat it as not being there
                                                if (!quiet && developer.integer >= 10)
                                                        Con_Printf("FS_FindFile: %s is marked as deleted\n", name);

                                                if (index != NULL)
                                                        *index = -1;
                                                return NULL;
                                        }

                                        if (!quiet && developer.integer >= 10)
                                                Con_Printf("FS_FindFile: %s in %s\n",
                                                                        pak->files[middle].name, pak->filename);

                                        if (index != NULL)
                                                *index = middle;
                                        return search;
                                }

                                // If we're too far in the list
                                if (diff > 0)
                                        right = middle - 1;
                                else
                                        left = middle + 1;
                        }
                }
                else
                {
                        char netpath[MAX_OSPATH];
                        dpsnprintf(netpath, sizeof(netpath), "%s%s", search->filename, name);
                        if (FS_SysFileExists (netpath))
                        {
                                if (!quiet && developer.integer >= 10)
                                        Con_Printf("FS_FindFile: %s\n", netpath);

                                if (index != NULL)
                                        *index = -1;
                                return search;
                        }
                }
        }

        if (!quiet && developer.integer >= 10)
                Con_Printf("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
===========
*/
qfile_t *FS_OpenReadFile (const char *filename, qboolean quiet, qboolean nonblocking, int symlinkLevels)
{
        searchpath_t *search;
        int pack_ind;

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

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

        // Found in the filesystem?
        if (pack_ind < 0)
        {
                char path [MAX_OSPATH];
                dpsnprintf (path, sizeof (path), "%s%s", search->filename, filename);
                return FS_SysOpen (path, "rb", nonblocking);
        }

        // So, we found it in a package...

        // Is it a PK3 symlink?
        // TODO also handle directory symlinks by parsing the whole structure...
        // but heck, file symlinks are good enough for now
        if(search->pack->files[pack_ind].flags & PACKFILE_FLAG_SYMLINK)
        {
                if(symlinkLevels <= 0)
                {
                        Con_Printf("symlink: %s: too many levels of symbolic links\n", filename);
                        return NULL;
                }
                else
                {
                        char linkbuf[MAX_QPATH];
                        fs_offset_t count;
                        qfile_t *linkfile = FS_OpenPackedFile (search->pack, pack_ind);
                        const char *mergeslash;
                        char *mergestart;

                        if(!linkfile)
                                return NULL;
                        count = FS_Read(linkfile, linkbuf, sizeof(linkbuf) - 1);
                        FS_Close(linkfile);
                        if(count < 0)
                                return NULL;
                        linkbuf[count] = 0;
                        
                        // Now combine the paths...
                        mergeslash = strrchr(filename, '/');
                        mergestart = linkbuf;
                        if(!mergeslash)
                                mergeslash = filename;
                        while(!strncmp(mergestart, "../", 3))
                        {
                                mergestart += 3;
                                while(mergeslash > filename)
                                {
                                        --mergeslash;
                                        if(*mergeslash == '/')
                                                break;
                                }
                        }
                        // Now, mergestart will point to the path to be appended, and mergeslash points to where it should be appended
                        if(mergeslash == filename)
                        {
                                // Either mergeslash == filename, then we just replace the name (done below)
                        }
                        else
                        {
                                // Or, we append the name after mergeslash;
                                // or rather, we can also shift the linkbuf so we can put everything up to and including mergeslash first
                                int spaceNeeded = mergeslash - filename + 1;
                                int spaceRemoved = mergestart - linkbuf;
                                if(count - spaceRemoved + spaceNeeded >= MAX_QPATH)
                                {
                                        Con_DPrintf("symlink: too long path rejected\n");
                                        return NULL;
                                }
                                memmove(linkbuf + spaceNeeded, linkbuf + spaceRemoved, count - spaceRemoved);
                                memcpy(linkbuf, filename, spaceNeeded);
                                linkbuf[count - spaceRemoved + spaceNeeded] = 0;
                                mergestart = linkbuf;
                        }
                        if (!quiet && developer_loading.integer)
                                Con_DPrintf("symlink: %s -> %s\n", filename, mergestart);
                        if(FS_CheckNastyPath (mergestart, false))
                        {
                                Con_DPrintf("symlink: nasty path %s rejected\n", mergestart);
                                return NULL;
                        }
                        return FS_OpenReadFile(mergestart, quiet, nonblocking, symlinkLevels - 1);
                }
        }

        return FS_OpenPackedFile (search->pack, pack_ind);
}


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

MAIN PUBLIC FUNCTIONS

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

/*
====================
FS_OpenRealFile

Open a file in the userpath. The syntax is the same as fopen
Used for savegame scanning in menu, and all file writing.
====================
*/
qfile_t* FS_OpenRealFile (const char* filepath, const char* mode, qboolean quiet)
{
        char real_path [MAX_OSPATH];

        if (FS_CheckNastyPath(filepath, false))
        {
                Con_Printf("FS_OpenRealFile(\"%s\", \"%s\", %s): nasty filename rejected\n", filepath, mode, quiet ? "true" : "false");
                return NULL;
        }

        dpsnprintf (real_path, sizeof (real_path), "%s/%s", fs_gamedir, filepath);

        // If the file is opened in "write", "append", or "read/write" mode,
        // create directories up to the file.
        if (mode[0] == 'w' || mode[0] == 'a' || strchr (mode, '+'))
                FS_CreatePath (real_path);
        return FS_SysOpen (real_path, mode, false);
}


/*
====================
FS_OpenVirtualFile

Open a file. The syntax is the same as fopen
====================
*/
qfile_t* FS_OpenVirtualFile (const char* filepath, qboolean quiet)
{
        if (FS_CheckNastyPath(filepath, false))
        {
                Con_Printf("FS_OpenVirtualFile(\"%s\", %s): nasty filename rejected\n", filepath, quiet ? "true" : "false");
                return NULL;
        }

        return FS_OpenReadFile (filepath, quiet, false, 16);
}


/*
====================
FS_FileFromData

Open a file. The syntax is the same as fopen
====================
*/
qfile_t* FS_FileFromData (const unsigned char *data, const size_t size, qboolean quiet)
{
        qfile_t* file;
        file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
        memset (file, 0, sizeof (*file));
        file->flags = QFILE_FLAG_DATA;
        file->ungetc = EOF;
        file->real_length = size;
        file->data = data;
        return file;
}

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

Close a file
====================
*/
int FS_Close (qfile_t* file)
{
        if(file->flags & QFILE_FLAG_DATA)
        {
                Mem_Free(file);
                return 0;
        }

        if (close (file->handle))
                return EOF;

        if (file->ztk)
        {
                qz_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 (qfile_t* file, const void* data, size_t datasize)
{
        fs_offset_t result;

        // 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 (qfile_t* file, void* buffer, size_t buffersize)
{
        fs_offset_t count, done;

        if (buffersize == 0)
                return 0;

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

        if(file->flags & QFILE_FLAG_DATA)
        {
                size_t left = file->real_length - file->position;
                if(buffersize > left)
                        buffersize = left;
                memcpy(buffer, file->data + file->position, buffersize);
                file->position += buffersize;
                return buffersize;
        }

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

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

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

        // If the file isn't compressed
        if (! (file->flags & QFILE_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;
                                memcpy (&((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)
                        {
                                Con_Printf ("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 = (unsigned int)(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 = qz_inflate (&ztk->zstream, Z_SYNC_FLUSH);
                        if (error != Z_OK && error != Z_STREAM_END)
                        {
                                Con_Printf ("FS_Read: Can't inflate file\n");
                                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;
                        memcpy (&((unsigned char*)buffer)[done], file->buff, count);
                        file->buff_ind = count;
                }

                // Else, we inflate directly in "buffer"
                else
                {
                        ztk->zstream.next_out = &((unsigned char*)buffer)[done];
                        ztk->zstream.avail_out = (unsigned int)buffersize;
                        error = qz_inflate (&ztk->zstream, Z_SYNC_FLUSH);
                        if (error != Z_OK && error != Z_STREAM_END)
                        {
                                Con_Printf ("FS_Read: Can't inflate file\n");
                                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 (qfile_t* file, const char *msg)
{
        return (int)FS_Write (file, msg, strlen (msg));
}

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

Print a string into a file
====================
*/
int FS_Printf(qfile_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 (qfile_t* file, const char* format, va_list ap)
{
        int len;
        fs_offset_t buff_size = MAX_INPUTLINE;
        char *tempbuff;

        for (;;)
        {
                tempbuff = (char *)Mem_Alloc (tempmempool, buff_size);
                len = dpvsnprintf (tempbuff, buff_size, 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 (qfile_t* file)
{
        unsigned 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 (qfile_t* file, unsigned char c)
{
        // If there's already a character waiting to be read
        if (file->ungetc != EOF)
                return EOF;

        file->ungetc = c;
        return c;
}


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

Move the position index in a file
====================
*/
int FS_Seek (qfile_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 > file->real_length)
                return -1;

        if(file->flags & QFILE_FLAG_DATA)
        {
                file->position = offset;
                return 0;
        }

        // 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 & QFILE_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;
                qz_inflateReset (&ztk->zstream);
        }

        // We need a big buffer to force inflating into it directly
        buffersize = 2 * sizeof (file->buff);
        buffer = (unsigned char *)Mem_Alloc (tempmempool, 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 (qfile_t* file)
{
        return file->position - file->buff_len + file->buff_ind;
}


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

Give the total size of a file
====================
*/
fs_offset_t FS_FileSize (qfile_t* file)
{
        return file->real_length;
}


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

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


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

Filename are relative to the quake directory.
Always appends a 0 byte.
============
*/
unsigned char *FS_LoadFile (const char *path, mempool_t *pool, qboolean quiet, fs_offset_t *filesizepointer)
{
        qfile_t *file;
        unsigned char *buf = NULL;
        fs_offset_t filesize = 0;

        file = FS_OpenVirtualFile(path, quiet);
        if (file)
        {
                filesize = file->real_length;
                if(filesize < 0)
                {
                        Con_Printf("FS_LoadFile(\"%s\", pool, %s, filesizepointer): trying to open a non-regular file\n", path, quiet ? "true" : "false");
                        FS_Close(file);
                        return NULL;
                }

                buf = (unsigned char *)Mem_Alloc (pool, filesize + 1);
                buf[filesize] = '\0';
                FS_Read (file, buf, filesize);
                FS_Close (file);
                if (developer_loadfile.integer)
                        Con_Printf("loaded file \"%s\" (%u bytes)\n", path, (unsigned int)filesize);
        }

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


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

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

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

        Con_DPrintf("FS_WriteFile: %s (%u bytes)\n", filename, (unsigned int)len);
        FS_Write (file, data, len);
        FS_Close (file);
        return true;
}


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

OTHERS PUBLIC FUNCTIONS

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

/*
============
FS_StripExtension
============
*/
void FS_StripExtension (const char *in, char *out, size_t size_out)
{
        char *last = NULL;
        char currentchar;

        if (size_out == 0)
                return;

        while ((currentchar = *in) && size_out > 1)
        {
                if (currentchar == '.')
                        last = out;
                else if (currentchar == '/' || currentchar == '\\' || currentchar == ':')
                        last = NULL;
                *out++ = currentchar;
                in++;
                size_out--;
        }
        if (last)
                *last = 0;
        else
                *out = 0;
}


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

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

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

        strlcat (path, extension, size_path);
}


/*
==================
FS_FileType

Look for a file in the packages and in the filesystem
==================
*/
int FS_FileType (const char *filename)
{
        searchpath_t *search;
        char fullpath[MAX_QPATH];

        search = FS_FindFile (filename, NULL, true);
        if(!search)
                return FS_FILETYPE_NONE;

        if(search->pack)
                return FS_FILETYPE_FILE; // TODO can't check directories in paks yet, maybe later

        dpsnprintf(fullpath, sizeof(fullpath), "%s%s", search->filename, filename);
        return FS_SysFileType(fullpath);
}


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

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


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

Look for a file in the filesystem only
==================
*/
int FS_SysFileType (const char *path)
{
#if WIN32
// Sajt - some older sdks are missing this define
# ifndef INVALID_FILE_ATTRIBUTES
#  define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
# endif

        DWORD result = GetFileAttributes(path);

        if(result == INVALID_FILE_ATTRIBUTES)
                return FS_FILETYPE_NONE;

        if(result & FILE_ATTRIBUTE_DIRECTORY)
                return FS_FILETYPE_DIRECTORY;

        return FS_FILETYPE_FILE;
#else
        struct stat buf;

        if (stat (path,&buf) == -1)
                return FS_FILETYPE_NONE;

        if(S_ISDIR(buf.st_mode))
                return FS_FILETYPE_DIRECTORY;

        return FS_FILETYPE_FILE;
#endif
}

qboolean FS_SysFileExists (const char *path)
{
        return FS_SysFileType (path) != FS_FILETYPE_NONE;
}

void FS_mkdir (const char *path)
{
#if WIN32
        _mkdir (path);
#else
        mkdir (path, 0777);
#endif
}

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

Allocate and fill a search structure with information on matching filenames.
===========
*/
fssearch_t *FS_Search(const char *pattern, int caseinsensitive, int quiet)
{
        fssearch_t *search;
        searchpath_t *searchpath;
        pack_t *pak;
        int i, basepathlength, numfiles, numchars, resultlistindex, dirlistindex;
        stringlist_t resultlist;
        stringlist_t dirlist;
        const char *slash, *backslash, *colon, *separator;
        char *basepath;
        char temp[MAX_OSPATH];

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

        if (i > 0)
        {
                Con_Printf("Don't use punctuation at the beginning of a search pattern!\n");
                return NULL;
        }

        stringlistinit(&resultlist);
        stringlistinit(&dirlist);
        search = NULL;
        slash = strrchr(pattern, '/');
        backslash = strrchr(pattern, '\\');
        colon = strrchr(pattern, ':');
        separator = max(slash, backslash);
        separator = max(separator, colon);
        basepathlength = separator ? (separator + 1 - pattern) : 0;
        basepath = (char *)Mem_Alloc (tempmempool, basepathlength + 1);
        if (basepathlength)
                memcpy(basepath, pattern, basepathlength);
        basepath[basepathlength] = 0;

        // search through the path, one element at a time
        for (searchpath = fs_searchpaths;searchpath;searchpath = searchpath->next)
        {
                // 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++)
                        {
                                strlcpy(temp, pak->files[i].name, sizeof(temp));
                                while (temp[0])
                                {
                                        if (matchpattern(temp, (char *)pattern, true))
                                        {
                                                for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
                                                        if (!strcmp(resultlist.strings[resultlistindex], temp))
                                                                break;
                                                if (resultlistindex == resultlist.numstrings)
                                                {
                                                        stringlistappend(&resultlist, temp);
                                                        if (!quiet && developer_loading.integer)
                                                                Con_Printf("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 = strrchr(temp, '/');
                                        backslash = strrchr(temp, '\\');
                                        colon = strrchr(temp, ':');
                                        separator = temp;
                                        if (separator < slash)
                                                separator = slash;
                                        if (separator < backslash)
                                                separator = backslash;
                                        if (separator < colon)
                                                separator = colon;
                                        *((char *)separator) = 0;
                                }
                        }
                }
                else
                {
                        stringlist_t matchedSet, foundSet;
                        const char *start = pattern;

                        stringlistinit(&matchedSet);
                        stringlistinit(&foundSet);
                        // add a first entry to the set
                        stringlistappend(&matchedSet, "");
                        // iterate through pattern's path
                        while (*start)
                        {
                                const char *asterisk, *wildcard, *nextseparator, *prevseparator;
                                char subpath[MAX_OSPATH];
                                char subpattern[MAX_OSPATH];

                                // find the next wildcard
                                wildcard = strchr(start, '?');
                                asterisk = strchr(start, '*');
                                if (asterisk && (!wildcard || asterisk < wildcard))
                                {
                                        wildcard = asterisk;
                                }

                                if (wildcard)
                                {
                                        nextseparator = strchr( wildcard, '/' );
                                }
                                else
                                {
                                        nextseparator = NULL;
                                }

                                if( !nextseparator ) {
                                        nextseparator = start + strlen( start );
                                }

                                // prevseparator points past the '/' right before the wildcard and nextseparator at the one following it (or at the end of the string)
                                // copy everything up except nextseperator
                                strlcpy(subpattern, pattern, min(sizeof(subpattern), (size_t) (nextseparator - pattern + 1)));
                                // find the last '/' before the wildcard
                                prevseparator = strrchr( subpattern, '/' );
                                if (!prevseparator)
                                        prevseparator = subpattern;
                                else
                                        prevseparator++;
                                // copy everything from start to the previous including the '/' (before the wildcard)
                                // everything up to start is already included in the path of matchedSet's entries
                                strlcpy(subpath, start, min(sizeof(subpath), (size_t) ((prevseparator - subpattern) - (start - pattern) + 1)));

                                // for each entry in matchedSet try to open the subdirectories specified in subpath
                                for( dirlistindex = 0 ; dirlistindex < matchedSet.numstrings ; dirlistindex++ ) {
                                        strlcpy( temp, matchedSet.strings[ dirlistindex ], sizeof(temp) );
                                        strlcat( temp, subpath, sizeof(temp) );
                                        listdirectory( &foundSet, searchpath->filename, temp );
                                }
                                if( dirlistindex == 0 ) {
                                        break;
                                }
                                // reset the current result set
                                stringlistfreecontents( &matchedSet );
                                // match against the pattern
                                for( dirlistindex = 0 ; dirlistindex < foundSet.numstrings ; dirlistindex++ ) {
                                        const char *direntry = foundSet.strings[ dirlistindex ];
                                        if (matchpattern(direntry, subpattern, true)) {
                                                stringlistappend( &matchedSet, direntry );
                                        }
                                }
                                stringlistfreecontents( &foundSet );

                                start = nextseparator;
                        }

                        for (dirlistindex = 0;dirlistindex < matchedSet.numstrings;dirlistindex++)
                        {
                                const char *temp = matchedSet.strings[dirlistindex];
                                if (matchpattern(temp, (char *)pattern, true))
                                {
                                        for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
                                                if (!strcmp(resultlist.strings[resultlistindex], temp))
                                                        break;
                                        if (resultlistindex == resultlist.numstrings)
                                        {
                                                stringlistappend(&resultlist, temp);
                                                if (!quiet && developer_loading.integer)
                                                        Con_Printf("SearchDirFile: %s\n", temp);
                                        }
                                }
                        }
                        stringlistfreecontents( &matchedSet );
                }
        }

        if (resultlist.numstrings)
        {
                stringlistsort(&resultlist);
                numfiles = resultlist.numstrings;
                numchars = 0;
                for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
                        numchars += (int)strlen(resultlist.strings[resultlistindex]) + 1;
                search = (fssearch_t *)Z_Malloc(sizeof(fssearch_t) + numchars + numfiles * sizeof(char *));
                search->filenames = (char **)((char *)search + sizeof(fssearch_t));
                search->filenamesbuffer = (char *)((char *)search + sizeof(fssearch_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 = strlen(resultlist.strings[resultlistindex]) + 1;
                        memcpy(search->filenames[numfiles], resultlist.strings[resultlistindex], textlen);
                        numfiles++;
                        numchars += (int)textlen;
                }
        }
        stringlistfreecontents(&resultlist);

        Mem_Free(basepath);
        return search;
}

void FS_FreeSearch(fssearch_t *search)
{
        Z_Free(search);
}

extern int con_linewidth;
int FS_ListDirectory(const char *pattern, int oneperline)
{
        int numfiles;
        int numcolumns;
        int numlines;
        int columnwidth;
        int linebufpos;
        int i, j, k, l;
        const char *name;
        char linebuf[MAX_INPUTLINE];
        fssearch_t *search;
        search = FS_Search(pattern, true, true);
        if (!search)
                return 0;
        numfiles = search->numfilenames;
        if (!oneperline)
        {
                // FIXME: the names could be added to one column list and then
                // gradually shifted into the next column if they fit, and then the
                // next to make a compact variable width listing but it's a lot more
                // complicated...
                // find width for columns
                columnwidth = 0;
                for (i = 0;i < numfiles;i++)
                {
                        l = (int)strlen(search->filenames[i]);
                        if (columnwidth < l)
                                columnwidth = l;
                }
                // count the spacing character
                columnwidth++;
                // calculate number of columns
                numcolumns = con_linewidth / columnwidth;
                // don't bother with the column printing if it's only one column
                if (numcolumns >= 2)
                {
                        numlines = (numfiles + numcolumns - 1) / numcolumns;
                        for (i = 0;i < numlines;i++)
                        {
                                linebufpos = 0;
                                for (k = 0;k < numcolumns;k++)
                                {
                                        l = i * numcolumns + k;
                                        if (l < numfiles)
                                        {
                                                name = search->filenames[l];
                                                for (j = 0;name[j] && linebufpos + 1 < (int)sizeof(linebuf);j++)
                                                        linebuf[linebufpos++] = name[j];
                                                // space out name unless it's the last on the line
                                                if (k + 1 < numcolumns && l + 1 < numfiles)
                                                        for (;j < columnwidth && linebufpos + 1 < (int)sizeof(linebuf);j++)
                                                                linebuf[linebufpos++] = ' ';
                                        }
                                }
                                linebuf[linebufpos] = 0;
                                Con_Printf("%s\n", linebuf);
                        }
                }
                else
                        oneperline = true;
        }
        if (oneperline)
                for (i = 0;i < numfiles;i++)
                        Con_Printf("%s\n", search->filenames[i]);
        FS_FreeSearch(search);
        return (int)numfiles;
}

static void FS_ListDirectoryCmd (const char* cmdname, int oneperline)
{
        const char *pattern;
        if (Cmd_Argc() > 3)
        {
                Con_Printf("usage:\n%s [path/pattern]\n", cmdname);
                return;
        }
        if (Cmd_Argc() == 2)
                pattern = Cmd_Argv(1);
        else
                pattern = "*";
        if (!FS_ListDirectory(pattern, oneperline))
                Con_Print("No files found.\n");
}

void FS_Dir_f(void)
{
        FS_ListDirectoryCmd("dir", true);
}

void FS_Ls_f(void)
{
        FS_ListDirectoryCmd("ls", false);
}

const char *FS_WhichPack(const char *filename)
{
        int index;
        searchpath_t *sp = FS_FindFile(filename, &index, true);
        if(sp && sp->pack)
                return sp->pack->shortname;
        else
                return 0;
}

/*
====================
FS_IsRegisteredQuakePack

Look for a proof of purchase file file in the requested package

If it is found, this file should NOT be downloaded.
====================
*/
qboolean FS_IsRegisteredQuakePack(const char *name)
{
        searchpath_t *search;
        pack_t *pak;

        // search through the path, one element at a time
        for (search = fs_searchpaths;search;search = search->next)
        {
                if (search->pack && !strcasecmp(FS_FileWithoutPath(search->filename), name))
                {
                        int (*strcmp_funct) (const char* str1, const char* str2);
                        int left, right, middle;

                        pak = search->pack;
                        strcmp_funct = pak->ignorecase ? strcasecmp : strcmp;

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

                                middle = (left + right) / 2;
                                diff = !strcmp_funct (pak->files[middle].name, "gfx/pop.lmp");

                                // Found it
                                if (!diff)
                                        return true;

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

                        // we found the requested pack but it is not registered quake
                        return false;
                }
        }

        return false;
}

int FS_CRCFile(const char *filename, size_t *filesizepointer)
{
        int crc = -1;
        unsigned char *filedata;
        fs_offset_t filesize;
        if (filesizepointer)
                *filesizepointer = 0;
        if (!filename || !*filename)
                return crc;
        filedata = FS_LoadFile(filename, tempmempool, true, &filesize);
        if (filedata)
        {
                if (filesizepointer)
                        *filesizepointer = filesize;
                crc = CRC_Block(filedata, filesize);
                Mem_Free(filedata);
        }
        return crc;
}

unsigned char *FS_Deflate(const unsigned char *data, size_t size, size_t *deflated_size, int level, mempool_t *mempool)
{
        z_stream strm;
        unsigned char *out = NULL;
        unsigned char *tmp;

        memset(&strm, 0, sizeof(strm));
        strm.zalloc = Z_NULL;
        strm.zfree = Z_NULL;
        strm.opaque = Z_NULL;

        if(level < 0)
                level = Z_DEFAULT_COMPRESSION;

        if(qz_deflateInit2(&strm, level, Z_DEFLATED, -MAX_WBITS, Z_MEMLEVEL_DEFAULT, Z_BINARY) != Z_OK)
        {
                Con_Printf("FS_Deflate: deflate init error!\n");
                return NULL;
        }

        strm.next_in = (unsigned char*)data;
        strm.avail_in = size;

        tmp = Mem_Alloc(tempmempool, size);
        if(!tmp)
        {
                Con_Printf("FS_Deflate: not enough memory in tempmempool!\n");
                qz_deflateEnd(&strm);
                return NULL;
        }

        strm.next_out = tmp;
        strm.avail_out = size;

        if(qz_deflate(&strm, Z_FINISH) != Z_STREAM_END)
        {
                Con_Printf("FS_Deflate: deflate failed!\n");
                qz_deflateEnd(&strm);
                Mem_Free(tmp);
                return NULL;
        }
        
        if(qz_deflateEnd(&strm) != Z_OK)
        {
                Con_Printf("FS_Deflate: deflateEnd failed\n");
                Mem_Free(tmp);
                return NULL;
        }

        if(strm.total_out >= size)
        {
                Con_Printf("FS_Deflate: deflate is useless on this data!\n");
                Mem_Free(tmp);
                return NULL;
        }

        out = Mem_Alloc(mempool, strm.total_out);
        if(!out)
        {
                Con_Printf("FS_Deflate: not enough memory in target mempool!\n");
                Mem_Free(tmp);
                return NULL;
        }

        if(deflated_size)
                *deflated_size = (size_t)strm.total_out;

        memcpy(out, tmp, strm.total_out);
        Mem_Free(tmp);
        
        return out;
}

static void AssertBufsize(sizebuf_t *buf, int length)
{
        if(buf->cursize + length > buf->maxsize)
        {
                int oldsize = buf->maxsize;
                unsigned char *olddata;
                olddata = buf->data;
                buf->maxsize += length;
                buf->data = Mem_Alloc(tempmempool, buf->maxsize);
                if(olddata)
                {
                        memcpy(buf->data, olddata, oldsize);
                        Mem_Free(olddata);
                }
        }
}

unsigned char *FS_Inflate(const unsigned char *data, size_t size, size_t *inflated_size, mempool_t *mempool)
{
        int ret;
        z_stream strm;
        unsigned char *out = NULL;
        unsigned char tmp[2048];
        unsigned int have;
        sizebuf_t outbuf;

        memset(&outbuf, 0, sizeof(outbuf));
        outbuf.data = Mem_Alloc(tempmempool, sizeof(tmp));
        outbuf.maxsize = sizeof(tmp);

        memset(&strm, 0, sizeof(strm));
        strm.zalloc = Z_NULL;
        strm.zfree = Z_NULL;
        strm.opaque = Z_NULL;

        if(qz_inflateInit2(&strm, -MAX_WBITS) != Z_OK)
        {
                Con_Printf("FS_Inflate: inflate init error!\n");
                Mem_Free(outbuf.data);
                return NULL;
        }

        strm.next_in = (unsigned char*)data;
        strm.avail_in = size;

        do
        {
                strm.next_out = tmp;
                strm.avail_out = sizeof(tmp);
                ret = qz_inflate(&strm, Z_NO_FLUSH);
                // it either returns Z_OK on progress, Z_STREAM_END on end
                // or an error code
                switch(ret)
                {
                        case Z_STREAM_END:
                        case Z_OK:
                                break;
                                
                        case Z_STREAM_ERROR:
                                Con_Print("FS_Inflate: stream error!\n");
                                break;
                        case Z_DATA_ERROR:
                                Con_Print("FS_Inflate: data error!\n");
                                break;
                        case Z_MEM_ERROR:
                                Con_Print("FS_Inflate: mem error!\n");
                                break;
                        case Z_BUF_ERROR:
                                Con_Print("FS_Inflate: buf error!\n");
                                break;
                        default:
                                Con_Print("FS_Inflate: unknown error!\n");
                                break;
                                
                }
                if(ret != Z_OK && ret != Z_STREAM_END)
                {
                        Con_Printf("Error after inflating %u bytes\n", (unsigned)strm.total_in);
                        Mem_Free(outbuf.data);
                        qz_inflateEnd(&strm);
                        return NULL;
                }
                have = sizeof(tmp) - strm.avail_out;
                AssertBufsize(&outbuf, max(have, sizeof(tmp)));
                SZ_Write(&outbuf, tmp, have);
        } while(ret != Z_STREAM_END);

        qz_inflateEnd(&strm);

        out = Mem_Alloc(mempool, outbuf.cursize);
        if(!out)
        {
                Con_Printf("FS_Inflate: not enough memory in target mempool!\n");
                Mem_Free(outbuf.data);
                return NULL;
        }

        memcpy(out, outbuf.data, outbuf.cursize);
        Mem_Free(outbuf.data);

        if(inflated_size)
                *inflated_size = (size_t)outbuf.cursize;
        
        return out;
}