]> de.git.xonotic.org Git - xonotic/darkplaces.git/blobdiff - fs.c
on OSX use ~/Library/Application Support/<gamename> instead of ~/.gamename
[xonotic/darkplaces.git] / fs.c
diff --git a/fs.c b/fs.c
index beddbec613a68da96bce9139c73cf90d81b0cb7c..b26dd4f25cc13938c31ea2268b701a7819c6d063 100644 (file)
--- a/fs.c
+++ b/fs.c
@@ -1,8 +1,7 @@
 /*
        DarkPlaces file system
 
-       Copyright (C) 2003 Mathieu Olivier
-       Copyright (C) 1999,2000  contributors of the QuakeForge project
+       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
                Boston, MA  02111-1307, USA
 */
 
-#include "quakedef.h"
+#ifdef __APPLE__
+// include SDL for IPHONEOS code
+# include <TargetConditionals.h>
+# if TARGET_OS_IPHONE
+#  include <SDL.h>
+# endif
+#endif
 
-#include <stdlib.h>
-#include <string.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
 
-#ifndef PATH_MAX
-# define PATH_MAX 512
-#endif
+#include "quakedef.h"
 
 #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
+
+/** \page fs File System
 
 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.
@@ -61,7 +89,7 @@ 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
-precacution against having a malicious server instruct clients to write files
+precaution against having a malicious server instruct clients to write files
 over areas they shouldn't.
 
 */
@@ -86,12 +114,44 @@ CONSTANTS
 #define ZIP_CDIR_CHUNK_BASE_SIZE       46
 #define ZIP_LOCAL_CHUNK_BASE_SIZE      30
 
+#ifdef LINK_TO_ZLIB
+#include <zlib.h>
+
+#define qz_inflate inflate
+#define qz_inflateEnd inflateEnd
+#define qz_inflateInit2_ inflateInit2_
+#define qz_inflateReset inflateReset
+#define qz_deflateInit2_ deflateInit2_
+#define qz_deflateEnd deflateEnd
+#define qz_deflate deflate
+#define Z_MEMLEVEL_DEFAULT 8
+#else
+
 // Zlib constants (from zlib.h)
 #define Z_SYNC_FLUSH   2
 #define MAX_WBITS              15
 #define Z_OK                   0
 #define Z_STREAM_END   1
-#define ZLIB_VERSION   "1.1.4"
+#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
 
 
 /*
@@ -102,61 +162,71 @@ TYPES
 =============================================================================
 */
 
-// Zlib stream (from zlib.h)
-// Warning: some pointers we don't use directly have
-// been cast to "void*" for a matter of simplicity
+/*! 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
 {
-       qbyte                   *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_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
 
-       qbyte                   *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
+       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
+       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
+       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
+       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;
+#endif
 
 
-// Our own file structure on top of FILE
-typedef enum
-{
-       FS_FLAG_NONE            = 0,
-       FS_FLAG_PACKED          = (1 << 0),     // inside a package (PAK or PK3)
-       FS_FLAG_DEFLATED        = (1 << 1)      // file is compressed using the deflate algorithm (PK3 only)
-} fs_flags_t;
+/// 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)
+/// real file will be removed on close
+#define QFILE_FLAG_REMOVE (1 << 3)
 
-#define ZBUFF_SIZE 1024
+#define FILE_BUFF_SIZE 2048
 typedef struct
 {
        z_stream        zstream;
-       size_t          real_length;                    // length of the uncompressed file
-       size_t          in_ind, in_max;                 // input buffer index and counter
-       size_t          in_position;                    // position in the compressed file
-       size_t          out_ind, out_max;               // output buffer index and counter
-       size_t          out_position;                   // how many bytes did we uncompress until now?
-       qbyte           input [ZBUFF_SIZE];
-       qbyte           output [ZBUFF_SIZE];
+       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
 {
-       fs_flags_t      flags;
-       FILE*           stream;
-       size_t          length;         // file size on disk (PACKED only)
-       size_t          offset;         // offset into a package (PACKED only)
-       size_t          position;       // current position in the file (PACKED only)
-       ztoolkit_t*     z;                      // used for inflating (DEFLATED only)
+       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];
+
+       ztoolkit_t*             ztk;    ///< For zipped files.
+
+       const unsigned char *data;      ///< For data files.
+
+       const char *filename; ///< Kept around for QFILE_FLAG_REMOVE, unused otherwise
 };
 
 
@@ -164,27 +234,28 @@ struct qfile_s
 
 // You can get the complete ZIP format description from PKWARE website
 
-typedef struct
+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 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;
+       fs_offset_t prepended_garbage;
 } pk3_endOfCentralDir_t;
 
 
 // ------ PAK files on disk ------ //
-typedef struct
+typedef struct dpackfile_s
 {
        char name[56];
        int filepos, filelen;
 } dpackfile_t;
 
-typedef struct
+typedef struct dpackheader_s
 {
        char id[4];
        int dirofs;
@@ -192,36 +263,38 @@ typedef struct
 } dpackheader_t;
 
 
-// Packages in memory
-typedef enum
-{
-       FILE_FLAG_NONE          = 0,
-       FILE_FLAG_TRUEOFFS      = (1 << 0),     // the offset in packfile_t is the true contents offset
-       FILE_FLAG_DEFLATED      = (1 << 1)      // file compressed using the deflate algorithm
-} file_flags_t;
+/*! \name 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
+typedef struct packfile_s
 {
        char name [MAX_QPATH];
-       file_flags_t flags;
-       size_t offset;
-       size_t packsize;        // size in the package
-       size_t realsize;        // real file size (uncompressed)
+       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];
-       FILE *handle;
-       int ignorecase; // PK3 ignores case
+       char shortname [MAX_QPATH];
+       int handle;
+       int ignorecase;  ///< PK3 ignores case
        int numfiles;
+       qboolean vpack;
        packfile_t *files;
-       mempool_t *mempool;
-       struct pack_s *next;
 } pack_t;
+//@}
 
-
-// Search paths for files (including packages)
+/// Search paths for files (including packages)
 typedef struct searchpath_s
 {
        // only one of filename / pack will be used
@@ -234,26 +307,52 @@ typedef struct searchpath_s
 /*
 =============================================================================
 
-VARIABLES
+FUNCTION PROTOTYPES
 
 =============================================================================
 */
 
-mempool_t *fs_mempool;
-mempool_t *pak_mempool;
+void FS_Dir_f(void);
+void FS_Ls_f(void);
+void FS_Which_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);
+
+
+/*
+=============================================================================
 
-int fs_filesize;
+VARIABLES
+
+=============================================================================
+*/
 
-pack_t *packlist = NULL;
+mempool_t *fs_mempool;
 
-searchpath_t *fs_searchpaths;
+searchpath_t *fs_searchpaths = NULL;
+const char *const fs_checkgamedir_missing = "missing";
 
 #define MAX_FILES_IN_PACK      65536
 
+char fs_userdir[MAX_OSPATH];
 char fs_gamedir[MAX_OSPATH];
 char fs_basedir[MAX_OSPATH];
+static pack_t *fs_selfpack = NULL;
+
+// list of active game directories (empty if not running a mod)
+int fs_numgamedirs = 0;
+char fs_gamedirs[MAX_GAMEDIRS][MAX_QPATH];
 
-qboolean fs_modified;   // set true if using non-id files
+// list of all gamedirs with modinfo.txt
+gamedir_t *fs_all_gamedirs = NULL;
+int fs_all_gamedirs_count = 0;
+
+cvar_t scr_screenshot_name = {CVAR_NORESETTODEFAULTS, "scr_screenshot_name","dp", "prefix name for saved screenshots (changes based on -game commandline, as well as which game mode is running; the date is encoded using strftime escapes)"};
+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"};
+cvar_t cvar_fs_gamedir = {CVAR_READONLY | CVAR_NORESETTODEFAULTS, "fs_gamedir", "", "the list of currently selected gamedirs (use the 'gamedir' command to change this)"};
 
 
 /*
@@ -264,8 +363,9 @@ PRIVATE FUNCTIONS - PK3 HANDLING
 =============================================================================
 */
 
+#ifndef LINK_TO_ZLIB
 // Functions exported from zlib
-#ifdef WIN32
+#if defined(WIN32) && defined(ZLIB_USES_WINAPI)
 # define ZEXPORT WINAPI
 #else
 # define ZEXPORT
@@ -275,9 +375,18 @@ 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);
+#endif
 
 #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))
+
+#ifndef LINK_TO_ZLIB
+//        qz_deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream))
 
 static dllfunction_t zlibfuncs[] =
 {
@@ -285,12 +394,25 @@ static dllfunction_t zlibfuncs[] =
        {"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
+/// Handle for Zlib DLL
 static dllhandle_t zlib_dll = NULL;
+#endif
 
+#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
 
 /*
 ====================
@@ -301,11 +423,9 @@ Unload the Zlib DLL
 */
 void PK3_CloseLibrary (void)
 {
-       if (!zlib_dll)
-               return;
-
-       Sys_UnloadLibrary (zlib_dll);
-       zlib_dll = NULL;
+#ifndef LINK_TO_ZLIB
+       Sys_UnloadLibrary (&zlib_dll);
+#endif
 }
 
 
@@ -318,44 +438,53 @@ Try to load the Zlib DLL
 */
 qboolean PK3_OpenLibrary (void)
 {
-       const char* dllname;
-       const dllfunction_t *func;
+#ifdef LINK_TO_ZLIB
+       return true;
+#else
+       const char* dllnames [] =
+       {
+#if 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;
 
-#ifdef WIN32
-       dllname = "zlib.dll";
-#else
-       dllname = "libz.so";
-#endif
-
-       // Initializations
-       for (func = zlibfuncs; func && func->name != NULL; func++)
-               *func->funcvariable = NULL;
-
        // Load the DLL
-       if (! (zlib_dll = Sys_LoadLibrary (dllname)))
-       {
-               Con_Printf("Can't find %s. Compressed files support disabled\n", dllname);
-               return false;
-       }
+       return Sys_LoadLibrary (dllnames, &zlib_dll, zlibfuncs);
+#endif
+}
 
-       // Get the function adresses
-       for (func = zlibfuncs; func && func->name != NULL; func++)
-               if (!(*func->funcvariable = (void *) Sys_GetProcAddress (zlib_dll, func->name)))
-               {
-                       Con_Printf("missing function \"%s\" - broken Zlib library!\n", func->name);
-                       PK3_CloseLibrary ();
-                       return false;
-               }
+/*
+====================
+FS_HasZlib
 
-       Con_Printf("%s loaded. Compressed files support enabled\n", dllname);
+See if zlib is available
+====================
+*/
+qboolean FS_HasZlib(void)
+{
+#ifdef LINK_TO_ZLIB
        return true;
+#else
+       PK3_OpenLibrary(); // to be safe
+       return (zlib_dll != 0);
+#endif
 }
 
-
 /*
 ====================
 PK3_GetEndOfCentralDir
@@ -363,15 +492,14 @@ PK3_GetEndOfCentralDir
 Extract the end of the central directory from a PK3 package
 ====================
 */
-qboolean PK3_GetEndOfCentralDir (const char *packfile, FILE *packhandle, pk3_endOfCentralDir_t *eocd)
+qboolean PK3_GetEndOfCentralDir (const char *packfile, int packhandle, pk3_endOfCentralDir_t *eocd)
 {
-       long filesize, maxsize;
-       qbyte *buffer, *ptr;
+       fs_offset_t filesize, maxsize;
+       unsigned char *buffer, *ptr;
        int ind;
 
        // Get the package size
-       fseek (packhandle, 0, SEEK_END);
-       filesize = ftell (packhandle);
+       filesize = lseek (packhandle, 0, SEEK_END);
        if (filesize < ZIP_END_CDIR_SIZE)
                return false;
 
@@ -380,9 +508,9 @@ qboolean PK3_GetEndOfCentralDir (const char *packfile, FILE *packhandle, pk3_end
                maxsize = filesize;
        else
                maxsize = ZIP_MAX_COMMENTS_SIZE + ZIP_END_CDIR_SIZE;
-       buffer = Mem_Alloc (tempmempool, maxsize);
-       fseek (packhandle, filesize - maxsize, SEEK_SET);
-       if (fread (buffer, 1, maxsize, packhandle) != (unsigned long) maxsize)
+       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;
@@ -413,6 +541,8 @@ qboolean PK3_GetEndOfCentralDir (const char *packfile, FILE *packhandle, pk3_end
        eocd->cdir_size = LittleLong (eocd->cdir_size);
        eocd->cdir_offset = LittleLong (eocd->cdir_offset);
        eocd->comment_size = LittleShort (eocd->comment_size);
+       eocd->prepended_garbage = filesize - (ind + ZIP_END_CDIR_SIZE) - eocd->cdir_offset - eocd->cdir_size; // this detects "SFX" zip files
+       eocd->cdir_offset += eocd->prepended_garbage;
 
        Mem_Free (buffer);
 
@@ -429,14 +559,18 @@ Extract the file list from a PK3 file
 */
 int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
 {
-       qbyte *central_dir, *ptr;
+       unsigned char *central_dir, *ptr;
        unsigned int ind;
-       int remaining;
+       fs_offset_t remaining;
 
        // Load the central directory in memory
-       central_dir = Mem_Alloc (tempmempool, eocd->cdir_size);
-       fseek (pack->handle, eocd->cdir_offset, SEEK_SET);
-       fread (central_dir, 1, eocd->cdir_size, pack->handle);
+       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) != (fs_offset_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
@@ -446,8 +580,7 @@ int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
        ptr = central_dir;
        for (ind = 0; ind < eocd->nbentries; ind++)
        {
-               size_t namesize, count;
-               packfile_t *file;
+               fs_offset_t namesize, count;
 
                // Checking the remaining size
                if (remaining < ZIP_CDIR_CHUNK_BASE_SIZE)
@@ -469,12 +602,19 @@ int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
                // 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] & 0x29) == 0 && (ptr[38] & 0x18) == 0)
+               if ((ptr[8] & 0x21) == 0 && (ptr[38] & 0x18) == 0)
                {
                        // Still enough bytes for the name?
-                       if ((size_t) remaining < namesize || namesize >= sizeof (*pack->files))
+                       if (remaining < namesize || namesize >= (int)sizeof (*pack->files))
                        {
                                Mem_Free (central_dir);
                                return -1;
@@ -483,19 +623,35 @@ int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
                        // WinZip doesn't use the "directory" attribute, so we need to check the name directly
                        if (ptr[ZIP_CDIR_CHUNK_BASE_SIZE + namesize - 1] != '/')
                        {
-                               // Extract the name
-                               file = &pack->files[pack->numfiles];
-                               memcpy (file->name, &ptr[ZIP_CDIR_CHUNK_BASE_SIZE], namesize);
-                               file->name[namesize] = '\0';
+                               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';
 
-                               // Compression, sizes and offset
                                if (BuffLittleShort (&ptr[10]))
-                                       file->flags = FILE_FLAG_DEFLATED;
-                               file->packsize = BuffLittleLong (&ptr[20]);
-                               file->realsize = BuffLittleLong (&ptr[24]);
-                               file->offset = BuffLittleLong (&ptr[42]);
+                                       flags = PACKFILE_FLAG_DEFLATED;
+                               else
+                                       flags = 0;
+                               offset = (unsigned int)(BuffLittleLong (&ptr[42]) + eocd->prepended_garbage);
+                               packsize = (unsigned int)BuffLittleLong (&ptr[20]);
+                               realsize = (unsigned int)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;
+                               }
 
-                               pack->numfiles++;
+                               FS_AddFileToPack (filename, pack, offset, packsize, realsize, flags);
                        }
                }
 
@@ -507,7 +663,9 @@ int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
                remaining -= count;
        }
 
-       Mem_Free (central_dir);
+       // If the package is empty, central_dir is NULL here
+       if (central_dir != NULL)
+               Mem_Free (central_dir);
        return pack->numfiles;
 }
 
@@ -519,49 +677,71 @@ FS_LoadPackPK3
 Create a package entry associated with a PK3 file
 ====================
 */
-pack_t *FS_LoadPackPK3 (const char *packfile)
+pack_t *FS_LoadPackPK3FromFD (const char *packfile, int packhandle, qboolean silent)
 {
-       FILE *packhandle;
        pk3_endOfCentralDir_t eocd;
        pack_t *pack;
        int real_nb_files;
 
-       packhandle = fopen (packfile, "rb");
-       if (!packhandle)
-               return NULL;
-
        if (! PK3_GetEndOfCentralDir (packfile, packhandle, &eocd))
-               Sys_Error ("%s is not a PK3 file", packfile);
+       {
+               if(!silent)
+                       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)
-               Sys_Error ("%s is a multi-volume ZIP archive", packfile);
+       {
+               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 MAX_FILES_IN_PACK < 65535
        if (eocd.nbentries > MAX_FILES_IN_PACK)
-               Sys_Error ("%s contains too many files (%hu)", packfile, eocd.nbentries);
-       #endif
+       {
+               Con_Printf ("%s contains too many files (%hu)\n", packfile, eocd.nbentries);
+               close(packhandle);
+               return NULL;
+       }
+#endif
 
        // Create a package structure in memory
-       pack = Mem_Alloc (pak_mempool, sizeof (pack_t));
+       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->mempool = Mem_AllocPool (packfile);
-       pack->files = Mem_Alloc (pack->mempool, eocd.nbentries * sizeof(packfile_t));
-       pack->next = packlist;
-       packlist = pack;
+       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)
-               Sys_Error ("%s is not a valid PK3 file", packfile);
+       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);
+       Con_DPrintf("Added packfile %s (%i files)\n", packfile, real_nb_files);
        return pack;
 }
+pack_t *FS_LoadPackPK3 (const char *packfile)
+{
+       int packhandle;
+#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;
+       return FS_LoadPackPK3FromFD(packfile, packhandle, false);
+}
 
 
 /*
@@ -571,25 +751,29 @@ PK3_GetTrueFileOffset
 Find where the true file data offset is
 ====================
 */
-void PK3_GetTrueFileOffset (packfile_t *file, pack_t *pack)
+qboolean PK3_GetTrueFileOffset (packfile_t *pfile, pack_t *pack)
 {
-       qbyte buffer [ZIP_LOCAL_CHUNK_BASE_SIZE];
-       size_t count;
+       unsigned char buffer [ZIP_LOCAL_CHUNK_BASE_SIZE];
+       fs_offset_t count;
 
        // Already found?
-       if (file->flags & FILE_FLAG_TRUEOFFS)
-               return;
+       if (pfile->flags & PACKFILE_FLAG_TRUEOFFS)
+               return true;
 
        // Load the local file description
-       fseek (pack->handle, file->offset, SEEK_SET);
-       count = fread (buffer, 1, ZIP_LOCAL_CHUNK_BASE_SIZE, pack->handle);
+       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)
-               Sys_Error ("Can't retrieve file %s in package %s", file->name, pack->filename);
+       {
+               Con_Printf ("Can't retrieve file %s in package %s\n", pfile->name, pack->filename);
+               return false;
+       }
 
        // Skip name and extra field
-       file->offset += BuffLittleShort (&buffer[26]) + BuffLittleShort (&buffer[28]) + ZIP_LOCAL_CHUNK_BASE_SIZE;
+       pfile->offset += BuffLittleShort (&buffer[26]) + BuffLittleShort (&buffer[28]) + ZIP_LOCAL_CHUNK_BASE_SIZE;
 
-       file->flags |= FILE_FLAG_TRUEOFFS;
+       pfile->flags |= PACKFILE_FLAG_TRUEOFFS;
+       return true;
 }
 
 
@@ -602,11 +786,64 @@ 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_WriteFile.
+Only used for FS_OpenRealFile.
 ============
 */
 void FS_CreatePath (char *path)
@@ -637,15 +874,18 @@ void FS_Path_f (void)
 {
        searchpath_t *s;
 
-       Con_Print("Current search path:\n");
+       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);
+                       if(s->pack->vpack)
+                               Con_Printf("%sdir (virtual pack)\n", s->pack->filename);
+                       else
+                               Con_Printf("%s (%i files)\n", s->pack->filename, s->pack->numfiles);
                }
                else
-                       Con_Printf ("%s\n", s->filename);
+                       Con_Printf("%s\n", s->filename);
        }
 }
 
@@ -653,532 +893,1468 @@ void FS_Path_f (void)
 /*
 =================
 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.
 =================
 */
+/*! 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;
-       FILE *packhandle;
+       int packhandle;
        pack_t *pack;
-       dpackfile_t *info;      // temporary alloc, allowing huge pack directories
+       dpackfile_t *info;
 
-       packhandle = fopen (packfile, "rb");
-       if (!packhandle)
+#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;
-
-       fread ((void *)&header, 1, sizeof(header), packhandle);
+       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))
-               Sys_Error ("%s is not a packfile", packfile);
+       {
+               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))
-               Sys_Error ("%s has an invalid directory size", packfile);
+       {
+               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)
-               Sys_Error ("%s has %i files", packfile, numpackfiles);
+       {
+               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 = Mem_Alloc(pak_mempool, sizeof (pack_t));
+       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 = numpackfiles;
-       pack->mempool = Mem_AllocPool(packfile);
-       pack->files = Mem_Alloc(pack->mempool, numpackfiles * sizeof(packfile_t));
-       pack->next = packlist;
-       packlist = pack;
-
-       info = Mem_Alloc(tempmempool, sizeof(*info) * numpackfiles);
-       fseek (packhandle, header.dirofs, SEEK_SET);
-       fread ((void *)info, 1, header.dirlen, 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++)
        {
-               size_t size;
-               packfile_t *file = &pack->files[i];
+               fs_offset_t offset = (unsigned int)LittleLong (info[i].filepos);
+               fs_offset_t size = (unsigned int)LittleLong (info[i].filelen);
 
-               strlcpy (file->name, info[i].name, sizeof (file->name));
-               file->offset = LittleLong(info[i].filepos);
-               size = LittleLong (info[i].filelen);
-               file->packsize = size;
-               file->realsize = size;
-               file->flags = FILE_FLAG_TRUEOFFS;
+               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);
+       Con_DPrintf("Added packfile %s (%i files)\n", packfile, numpackfiles);
        return pack;
 }
 
+/*
+====================
+FS_LoadPackVirtual
+
+Create a package entry associated with a directory file
+====================
+*/
+pack_t *FS_LoadPackVirtual (const char *dirname)
+{
+       pack_t *pack;
+       pack = (pack_t *)Mem_Alloc(fs_mempool, sizeof (pack_t));
+       pack->vpack = true;
+       pack->ignorecase = false;
+       strlcpy (pack->filename, dirname, sizeof(pack->filename));
+       pack->handle = -1;
+       pack->numfiles = -1;
+       pack->files = NULL;
+       Con_DPrintf("Added packfile %s (virtual pack)\n", dirname);
+       return pack;
+}
 
 /*
 ================
-FS_AddGameDirectory
-
-Sets fs_gamedir, adds the directory to the head of the path,
-then loads and adds pak1.pak pak2.pak ...
+FS_AddPack_Fullpath
 ================
 */
-void FS_AddGameDirectory (char *dir)
+/*! 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)
 {
-       stringlist_t *list, *current;
        searchpath_t *search;
-       pack_t *pak;
-       char pakfile[MAX_OSPATH];
-
-       strlcpy (fs_gamedir, dir, sizeof (fs_gamedir));
-
-       // add the directory to the search path
-       search = Mem_Alloc(pak_mempool, sizeof(searchpath_t));
-       strlcpy (search->filename, dir, sizeof (search->filename));
-       search->next = fs_searchpaths;
-       fs_searchpaths = search;
-
-       list = listdirectory(dir);
+       pack_t *pak = NULL;
+       const char *ext = FS_FileExtension(pakfile);
+       size_t l;
 
-       // add any PAK package in the directory
-       for (current = list;current;current = current->next)
+       for(search = fs_searchpaths; search; search = search->next)
        {
-               if (matchpattern(current->text, "*.pak", true))
+               if(search->pack && !strcasecmp(search->pack->filename, pakfile))
                {
-                       snprintf (pakfile, sizeof (pakfile), "%s/%s", dir, current->text);
-                       pak = FS_LoadPackPAK (pakfile);
-                       if (pak)
-                       {
-                               search = Mem_Alloc(pak_mempool, sizeof(searchpath_t));
-                               search->pack = pak;
-                               search->next = fs_searchpaths;
-                               fs_searchpaths = search;
-                       }
-                       else
-                               Con_Printf("unable to load pak \"%s\"\n", pakfile);
+                       if(already_loaded)
+                               *already_loaded = true;
+                       return true; // already loaded
                }
        }
 
-       // add any PK3 package in the director
-       for (current = list;current;current = current->next)
+       if(already_loaded)
+               *already_loaded = false;
+
+       if(!strcasecmp(ext, "pk3dir"))
+               pak = FS_LoadPackVirtual (pakfile);
+       else 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)
        {
-               if (matchpattern(current->text, "*.pk3", true))
+               strlcpy(pak->shortname, shortname, sizeof(pak->shortname));
+
+               //Con_DPrintf("  Registered pack with short name %s\n", shortname);
+               if(keep_plain_dirs)
                {
-                       snprintf (pakfile, sizeof (pakfile), "%s/%s", dir, current->text);
-                       pak = FS_LoadPackPK3 (pakfile);
-                       if (pak)
+                       // 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 = Mem_Alloc(pak_mempool, sizeof(searchpath_t));
-                               search->pack = pak;
+                               search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
                                search->next = fs_searchpaths;
                                fs_searchpaths = search;
                        }
                        else
-                               Con_Printf("unable to load pak \"%s\"\n", pakfile);
+                       // otherwise we want to append directly after insertion_point.
+                       {
+                               search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
+                               search->next = insertion_point->next;
+                               insertion_point->next = search;
+                       }
+               }
+               else
+               {
+                       search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
+                       search->next = fs_searchpaths;
+                       fs_searchpaths = search;
+               }
+               search->pack = pak;
+               if(pak->vpack)
+               {
+                       dpsnprintf(search->filename, sizeof(search->filename), "%s/", pakfile);
+                       // if shortname ends with "pk3dir", strip that suffix to make it just "pk3"
+                       // same goes for the name inside the pack structure
+                       l = strlen(pak->shortname);
+                       if(l >= 7)
+                               if(!strcasecmp(pak->shortname + l - 7, ".pk3dir"))
+                                       pak->shortname[l - 3] = 0;
+                       l = strlen(pak->filename);
+                       if(l >= 7)
+                               if(!strcasecmp(pak->filename + l - 7, ".pk3dir"))
+                                       pak->filename[l - 3] = 0;
                }
+               return true;
+       }
+       else
+       {
+               Con_Printf("unable to load pak \"%s\"\n", pakfile);
+               return false;
        }
-       freedirectory(list);
 }
 
 
 /*
-============
-FS_FileExtension
-============
+================
+FS_AddPack
+================
 */
-char *FS_FileExtension (const char *in)
+/*! 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)
 {
-       static char exten[8];
-       const char *slash, *backslash, *colon, *dot, *separator;
-       int i;
+       char fullpath[MAX_OSPATH];
+       int index;
+       searchpath_t *search;
 
-       slash = strrchr(in, '/');
-       backslash = strrchr(in, '\\');
-       colon = strrchr(in, ':');
-       dot = strrchr(in, '.');
-       separator = slash;
-       if (separator < backslash)
-               separator = backslash;
-       if (separator < colon)
-               separator = colon;
-       if (dot < separator)
-               return "";
-       dot++;
-       for (i = 0;i < 7 && dot[i];i++)
-               exten[i] = dot[i];
-       exten[i] = 0;
-       return exten;
+       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);
 }
 
-void FS_Dir_f(void);
-void FS_Ls_f(void);
 
 /*
 ================
-FS_Init
+FS_AddGameDirectory
+
+Sets fs_gamedir, adds the directory to the head of the path,
+then loads and adds pak1.pak pak2.pak ...
 ================
 */
-void FS_Init (void)
+void FS_AddGameDirectory (const char *dir)
 {
        int i;
+       stringlist_t list;
        searchpath_t *search;
 
-       fs_mempool = Mem_AllocPool("file management");
-       pak_mempool = Mem_AllocPool("paks");
-
-       Cmd_AddCommand ("path", FS_Path_f);
-       Cmd_AddCommand ("dir", FS_Dir_f);
-       Cmd_AddCommand ("ls", FS_Ls_f);
-
-       strcpy(fs_basedir, ".");
-
-       PK3_OpenLibrary ();
-
-       // -basedir <path>
-       // Overrides the system supplied base directory (under GAMENAME)
-       i = COM_CheckParm ("-basedir");
-       if (i && i < com_argc-1)
-               strlcpy (fs_basedir, com_argv[i+1], sizeof (fs_basedir));
+       strlcpy (fs_gamedir, dir, sizeof (fs_gamedir));
 
-       i = strlen (fs_basedir);
-       if (i > 0 && (fs_basedir[i-1] == '\\' || fs_basedir[i-1] == '/'))
-               fs_basedir[i-1] = 0;
+       stringlistinit(&list);
+       listdirectory(&list, "", dir);
+       stringlistsort(&list);
 
-       // start up with GAMENAME by default (id1)
-       strlcpy (com_modname, GAMENAME, sizeof (com_modname));
-       FS_AddGameDirectory (va("%s/"GAMENAME, fs_basedir));
-       if (gamedirname[0])
+       // add any PAK package in the directory
+       for (i = 0;i < list.numstrings;i++)
        {
-               fs_modified = true;
-               strlcpy (com_modname, gamedirname, sizeof (com_modname));
-               FS_AddGameDirectory (va("%s/%s", fs_basedir, gamedirname));
+               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") || !strcasecmp(FS_FileExtension(list.strings[i]), "pk3dir"))
+               {
+                       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)
+{
+       // Add the common game directory
+       FS_AddGameDirectory (va("%s%s/", fs_basedir, dir));
+
+       if (*fs_userdir)
+               FS_AddGameDirectory(va("%s%s/", fs_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 && search->pack != fs_selfpack)
+               {
+                       if(!search->pack->vpack)
+                       {
+                               // 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);
+       }
+}
+
+static void FS_AddSelfPack(void)
+{
+       if(fs_selfpack)
+       {
+               searchpath_t *search;
+               search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
+               search->next = fs_searchpaths;
+               search->pack = fs_selfpack;
+               fs_searchpaths = search;
+       }
+}
+
+
+/*
+================
+FS_Rescan
+================
+*/
+void FS_Rescan (void)
+{
+       int i;
+       qboolean fs_modified = false;
+       qboolean reset = false;
+       char gamedirbuf[MAX_INPUTLINE];
+
+       if (fs_searchpaths)
+               reset = true;
+       FS_ClearSearchPath();
+
+       // automatically activate gamemode for the gamedirs specified
+       if (reset)
+               COM_ChangeGameTypeForGameDirs();
+
+       // 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
-       i = COM_CheckParm ("-game");
-       if (i && i < com_argc-1)
+       // LordHavoc: now supports multiple -game directories
+       // set the com_modname (reported in server info)
+       *gamedirbuf = 0;
+       for (i = 0;i < fs_numgamedirs;i++)
        {
                fs_modified = true;
-               strlcpy (com_modname, com_argv[i+1], sizeof (com_modname));
-               FS_AddGameDirectory (va("%s/%s", fs_basedir, com_argv[i+1]));
+               FS_AddGameHierarchy (fs_gamedirs[i]);
+               // update the com_modname (used server info)
+               strlcpy (com_modname, fs_gamedirs[i], sizeof (com_modname));
+               if(i)
+                       strlcat(gamedirbuf, va(" %s", fs_gamedirs[i]), sizeof(gamedirbuf));
+               else
+                       strlcpy(gamedirbuf, fs_gamedirs[i], sizeof(gamedirbuf));
        }
+       Cvar_SetQuick(&cvar_fs_gamedir, gamedirbuf); // so QC or console code can query it
 
-       // -path <dir or packfile> [<dir or packfile>] ...
-       // Fully specifies the exact search path, overriding the generated one
-       i = COM_CheckParm ("-path");
-       if (i)
+       // add back the selfpack as new first item
+       FS_AddSelfPack();
+
+       // 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((i = COM_CheckParm("-modname")) && i < com_argc - 1)
+               strlcpy(com_modname, com_argv[i+1], sizeof(com_modname));
+
+       // 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 (FS_FileExists("gfx/pop.lmp"))
+               Cvar_Set ("registered", "1");
+       switch(gamemode)
        {
-               fs_modified = true;
-               fs_searchpaths = NULL;
-               while (++i < com_argc)
+       case GAME_NORMAL:
+       case GAME_HIPNOTIC:
+       case GAME_ROGUE:
+               if (!registered.integer)
                {
-                       if (!com_argv[i] || com_argv[i][0] == '+' || com_argv[i][0] == '-')
+                       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
+                       Con_Print("Playing registered version.\n");
+               break;
+       case GAME_STEELSTORM:
+               if (registered.integer)
+                       Con_Print("Playing registered version.\n");
+               else
+                       Con_Print("Playing shareware version.\n");
+               break;
+       default:
+               break;
+       }
+
+       // 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);
+extern qboolean vid_opened;
+extern void VID_Stop(void);
+qboolean FS_ChangeGameDirs(int numgamedirs, char gamedirs[][MAX_QPATH], qboolean complain, qboolean failmissing)
+{
+       int i;
+       const char *p;
+
+       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
+               p = FS_CheckGameDir(gamedirs[i]);
+               if(!p)
+               {
+                       if (complain)
+                               Con_Printf("Nasty gamedir name rejected: %s\n", gamedirs[i]);
+                       return false; // nasty gamedirs
+               }
+               if(p == fs_checkgamedir_missing && 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();
+
+       if (cls.demoplayback)
+       {
+               CL_Disconnect_f();
+               cls.demonum = 0;
+       }
+
+       // unload all sounds so they will be reloaded from the new files as needed
+       S_UnloadAllSounds_f();
+
+       // close down the video subsystem, it will start up again when the config finishes...
+       VID_Stop();
+       vid_opened = false;
+
+       // restart the video subsystem after the config is executed
+       Cbuf_InsertText("\nloadconfig\nvid_restart\n\n");
+
+       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);
+}
+
+static const char *FS_SysCheckGameDir(const char *gamedir)
+{
+       static char buf[8192];
+       qboolean success;
+       qfile_t *f;
+       stringlist_t list;
+       fs_offset_t n;
+
+       stringlistinit(&list);
+       listdirectory(&list, gamedir, "");
+       success = list.numstrings > 0;
+       stringlistfreecontents(&list);
+
+       if(success)
+       {
+               f = FS_SysOpen(va("%smodinfo.txt", gamedir), "r", false);
+               if(f)
+               {
+                       n = FS_Read (f, buf, sizeof(buf) - 1);
+                       if(n >= 0)
+                               buf[n] = 0;
+                       else
+                               *buf = 0;
+                       FS_Close(f);
+               }
+               else
+                       *buf = 0;
+               return buf;
+       }
+
+       return NULL;
+}
+
+/*
+================
+FS_CheckGameDir
+================
+*/
+const char *FS_CheckGameDir(const char *gamedir)
+{
+       const char *ret;
+
+       if (FS_CheckNastyPath(gamedir, true))
+               return NULL;
+
+       ret = FS_SysCheckGameDir(va("%s%s/", fs_userdir, gamedir));
+       if(ret)
+       {
+               if(!*ret)
+               {
+                       // get description from basedir
+                       ret = FS_SysCheckGameDir(va("%s%s/", fs_basedir, gamedir));
+                       if(ret)
+                               return ret;
+                       return "";
+               }
+               return ret;
+       }
+
+       ret = FS_SysCheckGameDir(va("%s%s/", fs_basedir, gamedir));
+       if(ret)
+               return ret;
+       
+       return fs_checkgamedir_missing;
+}
+
+static void FS_ListGameDirs(void)
+{
+       stringlist_t list, list2;
+       int i, j;
+       const char *info;
+
+       fs_all_gamedirs_count = 0;
+       if(fs_all_gamedirs)
+               Mem_Free(fs_all_gamedirs);
+
+       stringlistinit(&list);
+       listdirectory(&list, va("%s/", fs_basedir), "");
+       listdirectory(&list, va("%s/", fs_userdir), "");
+       stringlistsort(&list);
+
+       stringlistinit(&list2);
+       for(i = 0; i < list.numstrings; ++i)
+       {
+               if(i)
+                       if(!strcmp(list.strings[i-1], list.strings[i]))
+                               continue;
+               info = FS_CheckGameDir(list.strings[i]);
+               if(!info)
+                       continue;
+               if(info == fs_checkgamedir_missing)
+                       continue;
+               if(!*info)
+                       continue;
+               stringlistappend(&list2, list.strings[i]); 
+       }
+       stringlistfreecontents(&list);
+
+       fs_all_gamedirs = (gamedir_t *)Mem_Alloc(fs_mempool, list2.numstrings * sizeof(*fs_all_gamedirs));
+       for(i = 0; i < list2.numstrings; ++i)
+       {
+               info = FS_CheckGameDir(list2.strings[i]);
+               // all this cannot happen any more, but better be safe than sorry
+               if(!info)
+                       continue;
+               if(info == fs_checkgamedir_missing)
+                       continue;
+               if(!*info)
+                       continue;
+               strlcpy(fs_all_gamedirs[fs_all_gamedirs_count].name, list2.strings[i], sizeof(fs_all_gamedirs[j].name));
+               strlcpy(fs_all_gamedirs[fs_all_gamedirs_count].description, info, sizeof(fs_all_gamedirs[j].description));
+               ++fs_all_gamedirs_count;
+       }
+}
+
+/*
+================
+FS_Init_SelfPack
+================
+*/
+void FS_Init_SelfPack (void)
+{
+       PK3_OpenLibrary ();
+       fs_mempool = Mem_AllocPool("file management", 0, NULL);
+       if(com_selffd >= 0)
+       {
+               fs_selfpack = FS_LoadPackPK3FromFD(com_argv[0], com_selffd, true);
+               if(fs_selfpack)
+               {
+                       char *buf, *q;
+                       const char *p;
+                       FS_AddSelfPack();
+                       buf = (char *) FS_LoadFile("darkplaces.opt", tempmempool, true, NULL);
+                       if(buf)
+                       {
+                               const char **new_argv;
+                               int i = 0;
+                               int args_left = 256;
+                               new_argv = (const char **)Mem_Alloc(fs_mempool, sizeof(*com_argv) * (com_argc + args_left + 2));
+                               if(com_argc == 0)
+                               {
+                                       new_argv[0] = "dummy";
+                                       com_argc = 1;
+                               }
+                               else
+                               {
+                                       memcpy((char *)(&new_argv[0]), &com_argv[0], sizeof(*com_argv) * com_argc);
+                               }
+                               p = buf;
+                               while(COM_ParseToken_Console(&p))
+                               {
+                                       if(i >= args_left)
+                                               break;
+                                       q = (char *)Mem_Alloc(fs_mempool, strlen(com_token) + 1);
+                                       strlcpy(q, com_token, strlen(com_token) + 1);
+                                       new_argv[com_argc + i] = q;
+                                       ++i;
+                               }
+                               new_argv[i+com_argc] = NULL;
+                               com_argv = new_argv;
+                               com_argc = com_argc + i;
+                       }
+                       Mem_Free(buf);
+               }
+       }
+}
 
-                       search = Mem_Alloc(pak_mempool, sizeof(searchpath_t));
-                       if (!strcasecmp (FS_FileExtension(com_argv[i]), "pak"))
+/*
+================
+FS_Init
+================
+*/
+void FS_Init (void)
+{
+       const char *p;
+       int i;
+#ifdef WIN32
+       TCHAR mydocsdir[MAX_PATH + 1];
+#if _MSC_VER >= 1400
+       size_t homedirlen;
+#endif
+#endif
+#ifndef __IPHONEOS__
+       char *homedir;
+#endif
+
+#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_basedir = 0;
+       *fs_userdir = 0;
+       *fs_gamedir = 0;
+
+#ifdef __IPHONEOS__
+       // fs_basedir is "" by default, to utilize this you can simply add your gamedir to the Resources in xcode
+       // fs_userdir stores configurations to the Documents folder of the app
+       strlcpy(fs_userdir, "../Documents/", sizeof(fs_userdir));
+#else
+       // Add the personal game directory
+       if((i = COM_CheckParm("-userdir")) && i < com_argc - 1)
+       {
+               dpsnprintf(fs_userdir, sizeof(fs_userdir), "%s/", com_argv[i+1]);
+       }
+       else if(COM_CheckParm("-nohome"))
+       {
+               *fs_userdir = 0;
+       }
+       else
+       {
+#ifdef WIN32
+               if(qSHGetFolderPath && (qSHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, mydocsdir) == S_OK))
+               {
+                       dpsnprintf(fs_userdir, sizeof(fs_userdir), "%s/My Games/%s/", mydocsdir, gameuserdirname);
+                       Con_DPrintf("Obtained personal directory %s from SHGetFolderPath\n", fs_userdir);
+               }
+               else
+               {
+                       // use the environment
+#if _MSC_VER >= 1400
+                       _dupenv_s (&homedir, &homedirlen, "USERPROFILE");
+#else
+                       homedir = getenv("USERPROFILE");
+#endif
+
+                       if(homedir)
                        {
-                               search->pack = FS_LoadPackPAK (com_argv[i]);
-                               if (!search->pack)
-                                       Sys_Error ("Couldn't load packfile: %s", com_argv[i]);
+                               dpsnprintf(fs_userdir, sizeof(fs_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", fs_userdir);
                        }
-                       else if (!strcasecmp (FS_FileExtension (com_argv[i]), "pk3"))
+               }
+
+               if(!*fs_userdir)
+                       Con_DPrintf("Could not obtain home directory; not supporting -mygames\n");
+#else
+               homedir = getenv ("HOME");
+               if(homedir)
+               {
+#ifdef __APPLE__
+                       dpsnprintf(fs_userdir, sizeof(fs_userdir), "%s/Library/Application Support/%s/", homedir, gameuserdirname);
+#else
+                       dpsnprintf(fs_userdir, sizeof(fs_userdir), "%s/.%s/", homedir, gameuserdirname);
+#endif
+               }
+
+               if(!*fs_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, gamedirname1), 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, gamedirname1), O_WRONLY | O_CREAT, 0666); // note: no O_TRUNC here!
+#endif
+                       if(fd >= 0)
                        {
-                               search->pack = FS_LoadPackPK3 (com_argv[i]);
-                               if (!search->pack)
-                                       Sys_Error ("Couldn't load packfile: %s", com_argv[i]);
+                               close(fd);
+                               *fs_userdir = 0; // we have write access to the game dir, so let's use it
                        }
-                       else
-                               strlcpy (search->filename, com_argv[i], sizeof (search->filename));
-                       search->next = fs_searchpaths;
-                       fs_searchpaths = search;
                }
+#endif
+       }
+
+       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
+       *fs_basedir = 0;
+
+#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
+#endif
+
+       // -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));
+
+       FS_ListGameDirs();
+
+       p = FS_CheckGameDir(gamedirname1);
+       if(!p || p == fs_checkgamedir_missing)
+               Con_Printf("WARNING: base gamedir %s%s/ not found!\n", fs_basedir, gamedirname1);
+
+       if(gamedirname2)
+       {
+               p = FS_CheckGameDir(gamedirname2);
+               if(!p || p == fs_checkgamedir_missing)
+                       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++;
+                       p = FS_CheckGameDir(com_argv[i]);
+                       if(!p)
+                               Sys_Error("Nasty -game name rejected: %s", com_argv[i]);
+                       if(p == fs_checkgamedir_missing)
+                               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);
+       Cvar_RegisterVariable (&cvar_fs_gamedir);
+
+       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");
+       Cmd_AddCommand ("which", FS_Which_f, "accepts a file name as argument and reports where the file is taken from");
+}
+
+/*
+================
+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
+}
+
+int FS_SysOpenFD(const char *filepath, const char *mode, qboolean nonblocking)
+{
+       int handle;
+       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 -1;
+       }
+       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;
+
+#if _MSC_VER >= 1400
+       _sopen_s(&handle, filepath, mod | opt, _SH_DENYNO, _S_IREAD | _S_IWRITE);
+#else
+       handle = open (filepath, mod | opt, 0666);
+#endif
+       return handle;
+}
 
 /*
 ====================
 FS_SysOpen
 
-Internal function used to create a qfile_t and open the relevant file on disk
+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)
+qfile_t* FS_SysOpen (const char* filepath, const char* mode, qboolean nonblocking)
 {
        qfile_t* file;
 
-       file = Mem_Alloc (fs_mempool, sizeof (*file));
-       memset (file, 0, sizeof (*file));
-
-       file->stream = fopen (filepath, mode);
-       if (!file->stream)
+       file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
+       file->ungetc = EOF;
+       file->handle = FS_SysOpenFD(filepath, mode, nonblocking);
+       if (file->handle < 0)
        {
                Mem_Free (file);
                return NULL;
        }
 
+       file->filename = Mem_strdup(fs_mempool, filepath);
+
+       file->real_length = lseek (file->handle, 0, SEEK_END);
+
+       // For files opened in append mode, we start at the end of the file
+       if (mode[0] == 'a')
+               file->position = file->real_length;
+       else
+               lseek (file->handle, 0, SEEK_SET);
+
        return file;
 }
 
 
 /*
 ===========
-FS_OpenRead
+FS_OpenPackedFile
+
+Open a packed file using its package file descriptor
 ===========
 */
-qfile_t *FS_OpenRead (const char *path, int offs, int len)
+qfile_t *FS_OpenPackedFile (pack_t* pack, int pack_ind)
 {
+       packfile_t *pfile;
+       int dup_handle;
        qfile_t* file;
 
-       file = FS_SysOpen (path, "rb");
-       if (!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;
+
+#ifndef LINK_TO_ZLIB
+       // No Zlib DLL = no compressed files
+       if (!zlib_dll && (pfile->flags & PACKFILE_FLAG_DEFLATED))
        {
-               Sys_Error ("Couldn't open %s", path);
+               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;
        }
+#endif
 
-       // Normal file
-       if (offs < 0 || len < 0)
+       // 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)
        {
-               // We set fs_filesize here for normal files
-               fseek (file->stream, 0, SEEK_END);
-               fs_filesize = ftell (file->stream);
-               fseek (file->stream, 0, SEEK_SET);
+               Con_Printf ("FS_OpenPackedFile: can't lseek to %s in %s (offset: %08x%08x)\n",
+                                       pfile->name, pack->filename, (unsigned int)(pfile->offset >> 32), (unsigned int)(pfile->offset));
+               return NULL;
        }
-       // Packed file
-       else
+
+       dup_handle = dup (pack->handle);
+       if (dup_handle < 0)
        {
-               fseek (file->stream, offs, SEEK_SET);
+               Con_Printf ("FS_OpenPackedFile: can't dup package's handle (pack: %s)\n", pack->filename);
+               return NULL;
+       }
 
-               file->flags |= FS_FLAG_PACKED;
-               file->length = len;
-               file->offset = offs;
-               file->position = 0;
+       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_FOpenFile
-
-If the requested file is inside a packfile, a new qfile_t* will be opened
-into the file.
+====================
+FS_CheckNastyPath
 
-Sets fs_filesize
-===========
+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.
+====================
 */
-qfile_t *FS_FOpenFile (const char *filename, qboolean quiet)
+int FS_CheckNastyPath (const char *path, qboolean isgamedir)
 {
-       searchpath_t *search;
-       char netpath[MAX_OSPATH];
-       pack_t *pak;
-       int i, filenamelen, matched;
-
-       filenamelen = strlen (filename);
-
-       // LordHavoc: this is not written right!
-       // (should search have higher priority for files in each gamedir, while
-       // preserving the gamedir priorities, not searching for all paks in all
-       // gamedirs and then all files in all gamedirs)
-#ifdef AKVERSION
-       // first we search for a real file, after that we start to search through the paks
-       // search through the path, one element at a time
-       search = fs_searchpaths;
-
-       for( ; search ; search = search->next)
-               if(!search->pack)
+       // 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)
                {
-                       snprintf (netpath, sizeof (netpath), "%s/%s",search->filename, filename);
-
-                       if (!FS_SysFileExists (netpath))
-                               continue;
-
-                       if (!quiet)
-                               Sys_Printf ("FindFile: %s\n",netpath);
-                       return FS_OpenRead (netpath, -1, -1);
+                       // 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
+       }
 
-       search = fs_searchpaths;
-       for ( ; search ; search = search->next)
-               // is the element a pak file?
-               if (search->pack)
-               {
-                       // look through all the pak file elements
-                       pak = search->pack;
-                       for (i=0 ; i<pak->numfiles ; i++)
-                       {
-                               if (pak->ignorecase)
-                                       matched = !strcasecmp (pak->files[i].name, filename);
-                               else
-                                       matched = !strcmp (pak->files[i].name, filename);
-                               if (matched)  // found it?
-                               {
-                                       qfile_t *file;
+       // all: forbid trailing slash on gamedir
+       if (isgamedir && path[strlen(path)-1] == '/')
+               return 2;
 
-                                       if (!quiet)
-                                               Sys_Printf ("PackFile: %s : %s\n",pak->filename, pak->files[i].name);
+       // all: forbid leading dot on any filename for any reason
+       if (strstr(path, "/."))
+               return 2; // attempt to go outside the game directory
 
-                                       // If we don't have the true offset, get it now
-                                       if (! (pak->files[i].flags & FILE_FLAG_TRUEOFFS))
-                                               PK3_GetTrueFileOffset (&pak->files[i], pak);
+       // after all these checks we're pretty sure it's a / separated filename
+       // and won't do much if any harm
+       return false;
+}
 
-                                       // No Zlib DLL = no compressed files
-                                       if (!zlib_dll && (pak->files[i].flags & FILE_FLAG_DEFLATED))
-                                       {
-                                               Con_Printf ("WARNING: can't open the compressed file %s\n"
-                                                                       "You need the Zlib DLL to use compressed files\n", filename);
-                                               fs_filesize = -1;
-                                               return NULL;
-                                       }
 
-                                       // open a new file in the pakfile
-                                       file = FS_OpenRead (pak->filename, pak->files[i].offset, pak->files[i].packsize);
-                                       fs_filesize = pak->files[i].realsize;
+/*
+====================
+FS_FindFile
 
-                                       if (pak->files[i].flags & FILE_FLAG_DEFLATED)
-                                       {
-                                               ztoolkit_t *ztk;
+Look for a file in the packages and in the filesystem
 
-                                               file->flags |= FS_FLAG_DEFLATED;
+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;
 
-                                               // We need some more variables
-                                               ztk = Mem_Alloc (fs_mempool, sizeof (*file->z));
+       // 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 && !search->pack->vpack)
+               {
+                       int (*strcmp_funct) (const char* str1, const char* str2);
+                       int left, right, middle;
 
-                                               ztk->real_length = pak->files[i].realsize;
+                       pak = search->pack;
+                       strcmp_funct = pak->ignorecase ? strcasecmp : strcmp;
 
-                                               // Initialize zlib stream
-                                               ztk->zstream.next_in = ztk->input;
-                                               ztk->zstream.avail_in = 0;
+                       // Look for the file (binary search)
+                       left = 0;
+                       right = pak->numfiles - 1;
+                       while (left <= right)
+                       {
+                               int diff;
 
-                                               /* 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)
-                                                       Sys_Error ("inflate init error (file: %s)", filename);
+                               middle = (left + right) / 2;
+                               diff = strcmp_funct (pak->files[middle].name, name);
 
-                                               ztk->zstream.next_out = ztk->output;
-                                               ztk->zstream.avail_out = sizeof (ztk->output);
+                               // 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_extra.integer)
+                                                       Con_DPrintf("FS_FindFile: %s is marked as deleted\n", name);
 
-                                               file->z = ztk;
+                                               if (index != NULL)
+                                                       *index = -1;
+                                               return NULL;
                                        }
 
-                                       return file;
+                                       if (!quiet && developer_extra.integer)
+                                               Con_DPrintf("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
-       // search through the path, one element at a time
-       search = fs_searchpaths;
-
-       for ( ; search ; search = search->next)
-       {
-               // is the element a pak file?
-               if (search->pack)
+               else
                {
-                       // look through all the pak file elements
-                       pak = search->pack;
-                       for (i=0 ; i<pak->numfiles ; i++)
+                       char netpath[MAX_OSPATH];
+                       dpsnprintf(netpath, sizeof(netpath), "%s%s", search->filename, name);
+                       if (FS_SysFileExists (netpath))
                        {
-                               if (pak->ignorecase)
-                                       matched = !strcasecmp (pak->files[i].name, filename);
-                               else
-                                       matched = !strcmp (pak->files[i].name, filename);
-                               if (matched)  // found it?
-                               {
-                                       qfile_t *file;
-
-                                       if (!quiet)
-                                               Sys_Printf ("PackFile: %s : %s\n",pak->filename, pak->files[i].name);
+                               if (!quiet && developer_extra.integer)
+                                       Con_DPrintf("FS_FindFile: %s\n", netpath);
 
-                                       // If we don't have the true offset, get it now
-                                       if (! (pak->files[i].flags & FILE_FLAG_TRUEOFFS))
-                                               PK3_GetTrueFileOffset (&pak->files[i], pak);
-
-                                       // No Zlib DLL = no compressed files
-                                       if (!zlib_dll && (pak->files[i].flags & FILE_FLAG_DEFLATED))
-                                       {
-                                               Con_Printf ("WARNING: can't open the compressed file %s\n"
-                                                                       "You need the Zlib DLL to use compressed files\n", filename);
-                                               fs_filesize = -1;
-                                               return NULL;
-                                       }
+                               if (index != NULL)
+                                       *index = -1;
+                               return search;
+                       }
+               }
+       }
 
-                                       // open a new file in the pakfile
-                                       file = FS_OpenRead (pak->filename, pak->files[i].offset, pak->files[i].packsize);
-                                       fs_filesize = pak->files[i].realsize;
+       if (!quiet && developer_extra.integer)
+               Con_DPrintf("FS_FindFile: can't find %s\n", name);
 
-                                       if (pak->files[i].flags & FILE_FLAG_DEFLATED)
-                                       {
-                                               ztoolkit_t *ztk;
+       if (index != NULL)
+               *index = -1;
+       return NULL;
+}
 
-                                               file->flags |= FS_FLAG_DEFLATED;
 
-                                               // We need some more variables
-                                               ztk = Mem_Alloc (fs_mempool, sizeof (*file->z));
+/*
+===========
+FS_OpenReadFile
 
-                                               ztk->real_length = pak->files[i].realsize;
+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;
 
-                                               // Initialize zlib stream
-                                               ztk->zstream.next_in = ztk->input;
-                                               ztk->zstream.avail_in = 0;
+       search = FS_FindFile (filename, &pack_ind, quiet);
 
-                                               /* 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)
-                                                       Sys_Error ("inflate init error (file: %s)", filename);
+       // Not found?
+       if (search == NULL)
+               return NULL;
 
-                                               ztk->zstream.next_out = ztk->output;
-                                               ztk->zstream.avail_out = sizeof (ztk->output);
+       // Found in the filesystem?
+       if (pack_ind < 0)
+       {
+               // this works with vpacks, so we are fine
+               char path [MAX_OSPATH];
+               dpsnprintf (path, sizeof (path), "%s%s", search->filename, filename);
+               return FS_SysOpen (path, "rb", nonblocking);
+       }
 
-                                               file->z = ztk;
-                                       }
+       // So, we found it in a package...
 
-                                       return file;
-                               }
-                       }
+       // 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
                {
-                       snprintf (netpath, sizeof (netpath), "%s/%s",search->filename, filename);
-
-                       if (!FS_SysFileExists (netpath))
-                               continue;
-
-                       if (!quiet)
-                               Sys_Printf ("FindFile: %s\n",netpath);
-                       return FS_OpenRead (netpath, -1, -1);
+                       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);
                }
        }
-#endif
 
-       if (!quiet)
-               Sys_Printf ("FindFile: can't find %s\n", filename);
-
-       fs_filesize = -1;
-       return NULL;
+       return FS_OpenPackedFile (search->pack, pack_ind);
 }
 
 
@@ -1192,32 +2368,70 @@ MAIN PUBLIC FUNCTIONS
 
 /*
 ====================
-FS_Open
+FS_OpenRealFile
 
-Open a file. The syntax is the same as fopen
+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_Open (const char* filepath, const char* mode, qboolean quiet)
+qfile_t* FS_OpenRealFile (const char* filepath, const char* mode, qboolean quiet)
 {
-       // If the file is opened in "write" or "append" mode
-       if (strchr (mode, 'w') || strchr (mode, 'a'))
+       char real_path [MAX_OSPATH];
+
+       if (FS_CheckNastyPath(filepath, false))
        {
-               char real_path [MAX_OSPATH];
+               Con_Printf("FS_OpenRealFile(\"%s\", \"%s\", %s): nasty filename rejected\n", filepath, mode, quiet ? "true" : "false");
+               return NULL;
+       }
 
-               // Open the file on disk directly
-               snprintf (real_path, sizeof (real_path), "%s/%s", fs_gamedir, filepath);
+       dpsnprintf (real_path, sizeof (real_path), "%s/%s", fs_gamedir, filepath); // this is never a vpack
 
-               // Create directories up to the file
+       // 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);
+}
+
 
-               return FS_SysOpen (real_path, mode);
+/*
+====================
+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;
        }
 
-       // Else, we look at the various search paths
-       return FS_FOpenFile (filepath, quiet);
+       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
@@ -1227,19 +2441,37 @@ Close a file
 */
 int FS_Close (qfile_t* file)
 {
-       if (fclose (file->stream))
+       if(file->flags & QFILE_FLAG_DATA)
+       {
+               Mem_Free(file);
+               return 0;
+       }
+
+       if (close (file->handle))
                return EOF;
 
-       if (file->z)
+       if (file->filename)
+       {
+               if (file->flags & QFILE_FLAG_REMOVE)
+                       remove(file->filename);
+
+               Mem_Free((void *) file->filename);
+       }
+
+       if (file->ztk)
        {
-               qz_inflateEnd (&file->z->zstream);
-               Mem_Free (file->z);
+               qz_inflateEnd (&file->ztk->zstream);
+               Mem_Free (file->ztk);
        }
 
        Mem_Free (file);
        return 0;
 }
 
+void FS_RemoveOnClose(qfile_t* file)
+{
+       file->flags |= QFILE_FLAG_REMOVE;
+}
 
 /*
 ====================
@@ -1248,9 +2480,27 @@ FS_Write
 Write "datasize" bytes into a file
 ====================
 */
-size_t FS_Write (qfile_t* file, const void* data, size_t datasize)
+fs_offset_t FS_Write (qfile_t* file, const void* data, size_t datasize)
 {
-       return fwrite (data, 1, datasize, file->stream);
+       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;
 }
 
 
@@ -1261,139 +2511,196 @@ FS_Read
 Read up to "buffersize" bytes from a file
 ====================
 */
-size_t FS_Read (qfile_t* file, void* buffer, size_t buffersize)
+fs_offset_t FS_Read (qfile_t* file, void* buffer, size_t buffersize)
 {
-       size_t count, nb;
-       ztoolkit_t *ztk;
+       fs_offset_t count, done;
 
-       // Quick path for unpacked files
-       if (! (file->flags & FS_FLAG_PACKED))
-               return fread (buffer, 1, buffersize, file->stream);
+       if (buffersize == 0)
+               return 0;
 
-       // If the file isn't compressed
-       if (! (file->flags & FS_FLAG_DEFLATED))
+       // Get rid of the ungetc character
+       if (file->ungetc != EOF)
        {
-               // We must take care to not read after the end of the file
-               count = file->length - file->position;
-               if (buffersize > count)
-                       buffersize = count;
+               ((char*)buffer)[0] = file->ungetc;
+               buffersize--;
+               file->ungetc = EOF;
+               done = 1;
+       }
+       else
+               done = 0;
 
-               nb = fread (buffer, 1, buffersize, file->stream);
+       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;
+       }
 
-               file->position += nb;
-               return nb;
+       // 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;
        }
 
-       // If the file is compressed, it's more complicated...
-       ztk = file->z;
+       // NOTE: at this point, the read buffer is always empty
 
-       // First, we copy as many bytes as we can from "output"
-       if (ztk->out_ind < ztk->out_max)
+       // If the file isn't compressed
+       if (! (file->flags & QFILE_FLAG_DEFLATED))
        {
-               count = ztk->out_max - ztk->out_ind;
+               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;
+                       }
+               }
 
-               nb = (buffersize > count) ? count : buffersize;
-               memcpy (buffer, &ztk->output[ztk->out_ind], nb);
-               ztk->out_ind += nb;
-               file->position += nb;
+               return done;
        }
-       else
-               nb = 0;
 
-       // We cycle through a few operations until we have inflated enough data
-       while (nb < buffersize)
+       // If the file is compressed, it's more complicated...
+       // We cycle through a few operations until we have read enough data
+       while (buffersize > 0)
        {
-               // NOTE: at this point, "output" should always be empty
+               ztoolkit_t *ztk = file->ztk;
+               int error;
 
-               // If "input" is also empty, we need to fill it
-               if (ztk->in_ind == ztk->in_max)
-               {
-                       size_t remain = file->length - ztk->in_position;
+               // 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 (!remain)
-                               return nb;
-
-                       count = (remain > sizeof (ztk->input)) ? sizeof (ztk->input) : remain;
-                       fread (ztk->input, 1, count, file->stream);
+                       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;
+                       }
 
-                       // Update indexes and counters
                        ztk->in_ind = 0;
-                       ztk->in_max = count;
+                       ztk->in_len = count;
                        ztk->in_position += count;
                }
 
-               // Now that we are sure we have compressed data available, we need to determine
-               // if it's better to inflate it in "output" or directly in "buffer" (we are in this
-               // case if we still need more bytes than "output" can contain)
-
                ztk->zstream.next_in = &ztk->input[ztk->in_ind];
-               ztk->zstream.avail_in = ztk->in_max - ztk->in_ind;
+               ztk->zstream.avail_in = (unsigned int)(ztk->in_len - ztk->in_ind);
 
-               // If output will be able to contain at least 1 more byte than the data we need
-               if (buffersize - nb < sizeof (ztk->output))
-               {
-                       int error;
+               // 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 "output"
-                       ztk->zstream.next_out = ztk->output;
-                       ztk->zstream.avail_out = sizeof (ztk->output);
+               // 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)
-                               Sys_Error ("Can't inflate file");
-                       ztk->in_ind = ztk->in_max - ztk->zstream.avail_in;
-                       ztk->out_max = sizeof (ztk->output) - ztk->zstream.avail_out;
-                       ztk->out_position += ztk->out_max;
+                       {
+                               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 = (buffersize - nb > ztk->out_max) ? ztk->out_max : buffersize - nb;
-                       memcpy (&((qbyte*)buffer)[nb], ztk->output, count);
-                       ztk->out_ind = count;
+                       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
                {
-                       int error;
-
-                       // Inflate the data in "buffer"
-                       ztk->zstream.next_out = &((qbyte*)buffer)[nb];
-                       ztk->zstream.avail_out = buffersize - nb;
+                       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)
-                               Sys_Error ("Can't inflate file");
-                       ztk->in_ind = ztk->in_max - ztk->zstream.avail_in;
-
-                       // Invalidate the output data (for FS_Seek)
-                       ztk->out_max = 0;
-                       ztk->out_ind = 0;
+                       {
+                               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 = buffersize - nb - ztk->zstream.avail_out;
-                       ztk->out_position += count;
+                       count = (fs_offset_t)(buffersize - ztk->zstream.avail_out);
+                       file->position += count;
+
+                       // Purge cached data
+                       FS_Purge (file);
                }
 
-               nb += count;
-               file->position += count;
+               done += count;
+               buffersize -= count;
        }
 
-       return nb;
+       return done;
 }
 
 
 /*
 ====================
-FS_Flush
+FS_Print
 
-Flush the file output stream
+Print a string into a file
 ====================
 */
-int FS_Flush (qfile_t* file)
+int FS_Print (qfile_t* file, const char *msg)
 {
-       return fflush (file->stream);
+       return (int)FS_Write (file, msg, strlen (msg));
 }
 
-
 /*
 ====================
 FS_Printf
@@ -1401,19 +2708,49 @@ FS_Printf
 Print a string into a file
 ====================
 */
-int FS_Printf (qfile_t* file, const char* format, ...)
+int FS_Printf(qfile_t* file, const char* format, ...)
 {
        int result;
        va_list args;
 
        va_start (args, format);
-       result = vfprintf (file->stream, format, args);
+       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
@@ -1423,7 +2760,7 @@ Get the next character of a file
 */
 int FS_Getc (qfile_t* file)
 {
-       char c;
+       unsigned char c;
 
        if (FS_Read (file, &c, 1) != 1)
                return EOF;
@@ -1434,231 +2771,161 @@ int FS_Getc (qfile_t* file)
 
 /*
 ====================
-FS_Seek
+FS_UnGetc
 
-Move the position index in a file
+Put a character back into the read buffer (only supports one character!)
 ====================
 */
-int FS_Seek (qfile_t* file, long offset, int whence)
+int FS_UnGetc (qfile_t* file, unsigned char c)
 {
-       // Quick path for unpacked files
-       if (! (file->flags & FS_FLAG_PACKED))
-               return fseek (file->stream, offset, whence);
-
-       // Seeking in compressed files is more a hack than anything else,
-       // but we need to support it, so here it is.
-       if (file->flags & FS_FLAG_DEFLATED)
-       {
-               ztoolkit_t *ztk = file->z;
-               qbyte buffer [sizeof (ztk->output)];  // it's big to force inflating into buffer directly
-
-               switch (whence)
-               {
-                       case SEEK_CUR:
-                               offset += file->position;
-                               break;
-
-                       case SEEK_SET:
-                               break;
-
-                       case SEEK_END:
-                               offset += ztk->real_length;
-                               break;
-
-                       default:
-                               return -1;
-               }
-               if (offset < 0 || offset > (long) ztk->real_length)
-                       return -1;
-
-               // If we need to go back in the file
-               if (offset <= (long) file->position)
-               {
-                       // If we still have the data we need in the output buffer
-                       if (file->position - offset <= ztk->out_ind)
-                       {
-                               ztk->out_ind -= file->position - offset;
-                               file->position = offset;
-                               return 0;
-                       }
+       // If there's already a character waiting to be read
+       if (file->ungetc != EOF)
+               return EOF;
 
-                       // Else, we restart from the beginning of the file
-                       ztk->in_ind = 0;
-                       ztk->in_max = 0;
-                       ztk->in_position = 0;
-                       ztk->out_ind = 0;
-                       ztk->out_max = 0;
-                       ztk->out_position = 0;
-                       file->position = 0;
-                       fseek (file->stream, file->offset, SEEK_SET);
-
-                       // Reset the Zlib stream
-                       ztk->zstream.next_in = ztk->input;
-                       ztk->zstream.avail_in = 0;
-                       qz_inflateReset (&ztk->zstream);
-               }
+       file->ungetc = c;
+       return c;
+}
 
-               // Skip all data until we reach the requested offset
-               while ((long) file->position < offset)
-               {
-                       size_t diff = offset - file->position;
-                       size_t count, len;
 
-                       count = (diff > sizeof (buffer)) ? sizeof (buffer) : diff;
-                       len = FS_Read (file, buffer, count);
-                       if (len != count)
-                               return -1;
-               }
+/*
+====================
+FS_Seek
 
-               return 0;
-       }
+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;
 
-       // Packed files receive a special treatment too, because
-       // we need to make sure it doesn't go outside of the file
+       // Compute the file offset
        switch (whence)
        {
                case SEEK_CUR:
-                       offset += file->position;
+                       offset += file->position - file->buff_len + file->buff_ind;
                        break;
 
                case SEEK_SET:
                        break;
 
                case SEEK_END:
-                       offset += file->length;
+                       offset += file->real_length;
                        break;
 
                default:
                        return -1;
        }
-       if (offset < 0 || offset > (long) file->length)
-               return -1;
-
-       if (fseek (file->stream, file->offset + offset, SEEK_SET) == -1)
+       if (offset < 0 || offset > file->real_length)
                return -1;
-       file->position = offset;
-       return 0;
-}
-
-
-/*
-====================
-FS_Tell
-
-Give the current position in a file
-====================
-*/
-long FS_Tell (qfile_t* file)
-{
-       if (file->flags & FS_FLAG_PACKED)
-               return file->position;
 
-       return ftell (file->stream);
-}
+       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;
+       }
 
-/*
-====================
-FS_Gets
+       // Purge cached data
+       FS_Purge (file);
 
-Extract a line from a file
-====================
-*/
-char* FS_Gets (qfile_t* file, char* buffer, int buffersize)
-{
-       size_t ind;
+       // 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;
+       }
 
-       // Quick path for unpacked files
-       if (! (file->flags & FS_FLAG_PACKED))
-               return fgets (buffer, buffersize, file->stream);
+       // Seeking in compressed files is more a hack than anything else,
+       // but we need to support it, so here we go.
+       ztk = file->ztk;
 
-       for (ind = 0; ind < (size_t) buffersize - 1; ind++)
+       // If we have to go back in the file, we need to restart from the beginning
+       if (offset <= file->position)
        {
-               int c = FS_Getc (file);
-               switch (c)
-               {
-                       // End of file
-                       case -1:
-                               if (!ind)
-                                       return NULL;
+               ztk->in_ind = 0;
+               ztk->in_len = 0;
+               ztk->in_position = 0;
+               file->position = 0;
+               lseek (file->handle, file->offset, SEEK_SET);
 
-                               buffer[ind] = '\0';
-                               return buffer;
+               // Reset the Zlib stream
+               ztk->zstream.next_in = ztk->input;
+               ztk->zstream.avail_in = 0;
+               qz_inflateReset (&ztk->zstream);
+       }
 
-                       // End of line
-                       case '\r':
-                       case '\n':
-                               buffer[ind] = '\n';
-                               buffer[ind + 1] = '\0';
-                               return buffer;
+       // We need a big buffer to force inflating into it directly
+       buffersize = 2 * sizeof (file->buff);
+       buffer = (unsigned char *)Mem_Alloc (tempmempool, buffersize);
 
-                       default:
-                               buffer[ind] = c;
-               }
+       // 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;
+               }
        }
 
-       buffer[buffersize - 1] = '\0';
-       return buffer;
+       Mem_Free (buffer);
+       return 0;
 }
 
 
 /*
-==========
-FS_Getline
+====================
+FS_Tell
 
-Dynamic length version of fgets. DO NOT free the buffer.
-==========
+Give the current position in a file
+====================
 */
-char *FS_Getline (qfile_t *file)
+fs_offset_t FS_Tell (qfile_t* file)
 {
-       static int  size = 256;
-       static char *buf = 0;
-       char        *t;
-       int         len;
+       return file->position - file->buff_len + file->buff_ind;
+}
 
-       if (!buf)
-               buf = Mem_Alloc (fs_mempool, size);
 
-       if (!FS_Gets (file, buf, size))
-               return 0;
+/*
+====================
+FS_FileSize
 
-       len = strlen (buf);
-       while (buf[len - 1] != '\n' && buf[len - 1] != '\r')
-       {
-               t = Mem_Alloc (fs_mempool, size + 256);
-               memcpy(t, buf, size);
-               Mem_Free(buf);
-               size += 256;
-               buf = t;
-               if (!FS_Gets (file, buf + len, size - len))
-                       break;
-               len = strlen (buf);
-       }
-       while ((len = strlen(buf)) && (buf[len - 1] == '\n' || buf[len - 1] == '\r'))
-               buf[len - 1] = 0;
-       return buf;
+Give the total size of a file
+====================
+*/
+fs_offset_t FS_FileSize (qfile_t* file)
+{
+       return file->real_length;
 }
 
 
 /*
 ====================
-FS_Eof
+FS_Purge
 
-Extract a line from a file
+Erases any buffered input or output data
 ====================
 */
-int FS_Eof (qfile_t* file)
+void FS_Purge (qfile_t* file)
 {
-       if (file->flags & FS_FLAG_PACKED)
-       {
-               if (file->flags & FS_FLAG_DEFLATED)
-                       return (file->position == file->z->real_length);
-
-               return (file->position == file->length);
-       }
-
-       return feof (file->stream);
+       file->buff_len = 0;
+       file->buff_ind = 0;
+       file->ungetc = EOF;
 }
 
 
@@ -1670,25 +2937,33 @@ Filename are relative to the quake directory.
 Always appends a 0 byte.
 ============
 */
-qbyte *FS_LoadFile (const char *path, qboolean quiet)
+unsigned char *FS_LoadFile (const char *path, mempool_t *pool, qboolean quiet, fs_offset_t *filesizepointer)
 {
-       qfile_t *h;
-       qbyte *buf;
-
-       // look for it in the filesystem or pack files
-       h = FS_Open (path, "rb", quiet);
-       if (!h)
-               return NULL;
-
-       buf = Mem_Alloc(tempmempool, fs_filesize+1);
-       if (!buf)
-               Sys_Error ("FS_LoadFile: not enough available memory for %s (size %i)", path, fs_filesize);
+       qfile_t *file;
+       unsigned char *buf = NULL;
+       fs_offset_t filesize = 0;
 
-       ((qbyte *)buf)[fs_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;
+               }
 
-       FS_Read (h, buf, fs_filesize);
-       FS_Close (h);
+               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;
 }
 
@@ -1700,29 +2975,34 @@ FS_WriteFile
 The filename will be prefixed by the current game directory
 ============
 */
-qboolean FS_WriteFile (const char *filename, void *data, int len)
+qboolean FS_WriteFileInBlocks (const char *filename, const void *const *data, const fs_offset_t *len, size_t count)
 {
-       FILE *handle;
-       char name[MAX_OSPATH];
+       qfile_t *file;
+       size_t i;
+       fs_offset_t lentotal;
 
-       snprintf (name, sizeof (name), "%s/%s", fs_gamedir, filename);
-
-       // Create directories up to the file
-       FS_CreatePath (name);
-
-       handle = fopen (name, "wb");
-       if (!handle)
+       file = FS_OpenRealFile(filename, "wb", false);
+       if (!file)
        {
-               Con_Printf ("FS_WriteFile: failed on %s\n", name);
+               Con_Printf("FS_WriteFile: failed on %s\n", filename);
                return false;
        }
 
-       Con_DPrintf ("FS_WriteFile: %s\n", name);
-       fwrite (data, 1, len, handle);
-       fclose (handle);
+       lentotal = 0;
+       for(i = 0; i < count; ++i)
+               lentotal += len[i];
+       Con_DPrintf("FS_WriteFile: %s (%u bytes)\n", filename, (unsigned int)lentotal);
+       for(i = 0; i < count; ++i)
+               FS_Write (file, data[i], len[i]);
+       FS_Close (file);
        return true;
 }
 
+qboolean FS_WriteFile (const char *filename, const void *data, fs_offset_t len)
+{
+       return FS_WriteFileInBlocks(filename, &data, &len, 1);
+}
+
 
 /*
 =============================================================================
@@ -1740,17 +3020,19 @@ 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 (*in && size_out > 1)
+       while ((currentchar = *in) && size_out > 1)
        {
-               if (*in == '.')
+               if (currentchar == '.')
                        last = out;
-               else if (*in == '/' || *in == '\\' || *in == ':')
+               else if (currentchar == '/' || currentchar == '\\' || currentchar == ':')
                        last = NULL;
-               *out++ = *in++;
+               *out++ = currentchar;
+               in++;
                size_out--;
        }
        if (last)
@@ -1784,55 +3066,86 @@ void FS_DefaultExtension (char *path, const char *extension, size_t size_path)
 }
 
 
-qboolean FS_FileExists (const char *filename)
+/*
+==================
+FS_FileType
+
+Look for a file in the packages and in the filesystem
+==================
+*/
+int FS_FileType (const char *filename)
 {
        searchpath_t *search;
-       char netpath[MAX_OSPATH];
-       pack_t *pak;
-       int i;
+       char fullpath[MAX_OSPATH];
 
-       for (search = fs_searchpaths;search;search = search->next)
-       {
-               if (search->pack)
-               {
-                       pak = search->pack;
-                       for (i = 0;i < pak->numfiles;i++)
-                               if (!strcmp (pak->files[i].name, filename))
-                                       return true;
-               }
-               else
-               {
-                       snprintf (netpath, sizeof (netpath), "%s/%s",search->filename, filename);
-                       if (FS_SysFileExists (netpath))
-                               return true;
-               }
-       }
+       search = FS_FindFile (filename, NULL, true);
+       if(!search)
+               return FS_FILETYPE_NONE;
 
-       return false;
+       if(search->pack && !search->pack->vpack)
+               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);
 }
 
 
-qboolean FS_SysFileExists (const char *path)
+/*
+==================
+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
-       FILE *f;
+// Sajt - some older sdks are missing this define
+# ifndef INVALID_FILE_ATTRIBUTES
+#  define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
+# endif
 
-       f = fopen (path, "rb");
-       if (f)
-       {
-               fclose (f);
-               return true;
-       }
+       DWORD result = GetFileAttributes(path);
 
-       return false;
+       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 false;
+               return FS_FILETYPE_NONE;
 
-       return true;
+#ifndef S_ISDIR
+#define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
 #endif
+       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)
@@ -1856,34 +3169,32 @@ 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;
-       stringlist_t *dir, *dirfile, *liststart, *listcurrent, *listtemp;
+       int i, basepathlength, numfiles, numchars, resultlistindex, dirlistindex;
+       stringlist_t resultlist;
+       stringlist_t dirlist;
        const char *slash, *backslash, *colon, *separator;
        char *basepath;
-       char netpath[MAX_OSPATH];
        char temp[MAX_OSPATH];
 
-       while(!strncmp(pattern, "./", 2))
-               pattern += 2;
-       while(!strncmp(pattern, ".\\", 2))
-               pattern += 2;
+       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;
-       liststart = NULL;
-       listcurrent = NULL;
-       listtemp = NULL;
        slash = strrchr(pattern, '/');
        backslash = strrchr(pattern, '\\');
        colon = strrchr(pattern, ':');
-       separator = pattern;
-       if (separator < slash)
-               separator = slash;
-       if (separator < backslash)
-               separator = backslash;
-       if (separator < colon)
-               separator = colon;
-       basepathlength = separator - pattern;
-       basepath = Z_Malloc(basepathlength + 1);
+       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;
@@ -1892,27 +3203,25 @@ fssearch_t *FS_Search(const char *pattern, int caseinsensitive, int quiet)
        for (searchpath = fs_searchpaths;searchpath;searchpath = searchpath->next)
        {
                // is the element a pak file?
-               if (searchpath->pack)
+               if (searchpath->pack && !searchpath->pack->vpack)
                {
                        // look through all the pak file elements
                        pak = searchpath->pack;
                        for (i = 0;i < pak->numfiles;i++)
                        {
-                               strcpy(temp, pak->files[i].name);
+                               strlcpy(temp, pak->files[i].name, sizeof(temp));
                                while (temp[0])
                                {
                                        if (matchpattern(temp, (char *)pattern, true))
                                        {
-                                               for (listtemp = liststart;listtemp;listtemp = listtemp->next)
-                                                       if (!strcmp(listtemp->text, temp))
+                                               for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
+                                                       if (!strcmp(resultlist.strings[resultlistindex], temp))
                                                                break;
-                                               if (listtemp == NULL)
+                                               if (resultlistindex == resultlist.numstrings)
                                                {
-                                                       listcurrent = stringlistappend(listcurrent, temp);
-                                                       if (liststart == NULL)
-                                                               liststart = listcurrent;
-                                                       if (!quiet)
-                                                               Sys_Printf("SearchPackFile: %s : %s\n", pak->filename, temp);
+                                                       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
@@ -1933,61 +3242,123 @@ fssearch_t *FS_Search(const char *pattern, int caseinsensitive, int quiet)
                }
                else
                {
-                       // get a directory listing and look at each name
-                       snprintf(netpath, sizeof (netpath), "%s/%s", searchpath->filename, basepath);
-                       if ((dir = listdirectory(netpath)))
+                       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)
                        {
-                               for (dirfile = dir;dirfile;dirfile = dirfile->next)
+                               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))
                                {
-                                       snprintf(temp, sizeof(temp), "%s/%s", basepath, dirfile->text);
-                                       if (matchpattern(temp, (char *)pattern, true))
+                                       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)
                                        {
-                                               for (listtemp = liststart;listtemp;listtemp = listtemp->next)
-                                                       if (!strcmp(listtemp->text, temp))
-                                                               break;
-                                               if (listtemp == NULL)
-                                               {
-                                                       listcurrent = stringlistappend(listcurrent, temp);
-                                                       if (liststart == NULL)
-                                                               liststart = listcurrent;
-                                                       if (!quiet)
-                                                               Sys_Printf("SearchDirFile: %s\n", temp);
-                                               }
+                                               stringlistappend(&resultlist, temp);
+                                               if (!quiet && developer_loading.integer)
+                                                       Con_Printf("SearchDirFile: %s\n", temp);
                                        }
                                }
-                               freedirectory(dir);
                        }
+                       stringlistfreecontents( &matchedSet );
                }
        }
 
-       if (liststart)
+       if (resultlist.numstrings)
        {
-               liststart = stringlistsort(liststart);
-               numfiles = 0;
+               stringlistsort(&resultlist);
+               numfiles = resultlist.numstrings;
                numchars = 0;
-               for (listtemp = liststart;listtemp;listtemp = listtemp->next)
-               {
-                       numfiles++;
-                       numchars += strlen(listtemp->text) + 1;
-               }
-               search = Z_Malloc(sizeof(fssearch_t) + numchars + numfiles * sizeof(char *));
+               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 = numfiles;
+               search->numfilenames = (int)numfiles;
                numfiles = 0;
                numchars = 0;
-               for (listtemp = liststart;listtemp;listtemp = listtemp->next)
+               for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
                {
+                       size_t textlen;
                        search->filenames[numfiles] = search->filenamesbuffer + numchars;
-                       strcpy(search->filenames[numfiles], listtemp->text);
+                       textlen = strlen(resultlist.strings[resultlistindex]) + 1;
+                       memcpy(search->filenames[numfiles], resultlist.strings[resultlistindex], textlen);
                        numfiles++;
-                       numchars += strlen(listtemp->text) + 1;
+                       numchars += (int)textlen;
                }
-               if (liststart)
-                       stringlistfree(liststart);
        }
+       stringlistfreecontents(&resultlist);
 
-       Z_Free(basepath);
+       Mem_Free(basepath);
        return search;
 }
 
@@ -2006,9 +3377,9 @@ int FS_ListDirectory(const char *pattern, int oneperline)
        int linebufpos;
        int i, j, k, l;
        const char *name;
-       char linebuf[4096];
+       char linebuf[MAX_INPUTLINE];
        fssearch_t *search;
-       search = FS_Search(pattern, true, false);
+       search = FS_Search(pattern, true, true);
        if (!search)
                return 0;
        numfiles = search->numfilenames;
@@ -2022,7 +3393,7 @@ int FS_ListDirectory(const char *pattern, int oneperline)
                columnwidth = 0;
                for (i = 0;i < numfiles;i++)
                {
-                       l = strlen(search->filenames[i]);
+                       l = (int)strlen(search->filenames[i]);
                        if (columnwidth < l)
                                columnwidth = l;
                }
@@ -2043,11 +3414,11 @@ int FS_ListDirectory(const char *pattern, int oneperline)
                                        if (l < numfiles)
                                        {
                                                name = search->filenames[l];
-                                               for (j = 0;name[j] && j < (int)sizeof(linebuf) - 1;j++)
+                                               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 < (numcolumns - 1) && l < (numfiles - 1))
-                                                       for (;j < columnwidth && j < (int)sizeof(linebuf) - 1;j++)
+                                               if (k + 1 < numcolumns && l + 1 < numfiles)
+                                                       for (;j < columnwidth && linebufpos + 1 < (int)sizeof(linebuf);j++)
                                                                linebuf[linebufpos++] = ' ';
                                        }
                                }
@@ -2062,35 +3433,335 @@ int FS_ListDirectory(const char *pattern, int oneperline)
                for (i = 0;i < numfiles;i++)
                        Con_Printf("%s\n", search->filenames[i]);
        FS_FreeSearch(search);
-       return numfiles;
+       return (int)numfiles;
 }
 
-void FS_Dir_f(void)
+static void FS_ListDirectoryCmd (const char* cmdname, int oneperline)
 {
-       char pattern[MAX_OSPATH];
+       const char *pattern;
        if (Cmd_Argc() > 3)
        {
-               Con_Printf("usage:\ndir [path/pattern]\n");
+               Con_Printf("usage:\n%s [path/pattern]\n", cmdname);
                return;
        }
-       strcpy(pattern, "*");
        if (Cmd_Argc() == 2)
-               snprintf(pattern, sizeof(pattern), "%s", Cmd_Argv(1));
-       if (!FS_ListDirectory(pattern, true))
-               Con_Printf("No files found.\n");
+               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)
 {
-       char pattern[MAX_OSPATH];
-       if (Cmd_Argc() > 3)
+       FS_ListDirectoryCmd("ls", false);
+}
+
+void FS_Which_f(void)
+{
+       const char *filename;
+       int index;
+       searchpath_t *sp;
+       if (Cmd_Argc() != 2)
        {
-               Con_Printf("usage:\nls [path/pattern]\n");
+               Con_Printf("usage:\n%s <file>\n", Cmd_Argv(0));
+               return;
+       }  
+       filename = Cmd_Argv(1);
+       sp = FS_FindFile(filename, &index, true);
+       if (!sp) {
+               Con_Printf("%s isn't anywhere\n", filename);
                return;
        }
-       strcpy(pattern, "*");
-       if (Cmd_Argc() == 2)
-               snprintf(pattern, sizeof(pattern), "%s", Cmd_Argv(1));
-       FS_ListDirectory(pattern, false);
+       if (sp->pack)
+       {
+               if(sp->pack->vpack)
+                       Con_Printf("%s is in virtual package %sdir\n", filename, sp->pack->shortname);
+               else
+                       Con_Printf("%s is in package %s\n", filename, sp->pack->shortname);
+       }
+       else
+               Con_Printf("%s is file %s%s\n", filename, sp->filename, filename);
+}
+
+
+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 && !search->pack->vpack && !strcasecmp(FS_FileWithoutPath(search->filename), name))
+                       // TODO do we want to support vpacks in here too?
+               {
+                       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;
+
+       *deflated_size = 0;
+#ifndef LINK_TO_ZLIB
+       if(!zlib_dll)
+               return NULL;
+#endif
+
+       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 = (unsigned char *) 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 = (unsigned char *) 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 = (unsigned char *) 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;
+
+       *inflated_size = 0;
+#ifndef LINK_TO_ZLIB
+       if(!zlib_dll)
+               return NULL;
+#endif
+
+       memset(&outbuf, 0, sizeof(outbuf));
+       outbuf.data = (unsigned char *) 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 = (unsigned char *) 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;
+}