Remove FS_FIX_PATHS again and disable model rendering in the menu until someone can...
[divverent/darkplaces.git] / fs.c
1 /*
2         DarkPlaces file system
3
4         Copyright (C) 2003-2006 Mathieu Olivier
5
6         This program is free software; you can redistribute it and/or
7         modify it under the terms of the GNU General Public License
8         as published by the Free Software Foundation; either version 2
9         of the License, or (at your option) any later version.
10
11         This program is distributed in the hope that it will be useful,
12         but WITHOUT ANY WARRANTY; without even the implied warranty of
13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14
15         See the GNU General Public License for more details.
16
17         You should have received a copy of the GNU General Public License
18         along with this program; if not, write to:
19
20                 Free Software Foundation, Inc.
21                 59 Temple Place - Suite 330
22                 Boston, MA  02111-1307, USA
23 */
24
25 #include "quakedef.h"
26
27 #include <limits.h>
28 #include <fcntl.h>
29
30 #ifdef WIN32
31 # include <direct.h>
32 # include <io.h>
33 # include <shlobj.h>
34 #else
35 # include <pwd.h>
36 # include <sys/stat.h>
37 # include <unistd.h>
38 #endif
39
40 #include "fs.h"
41 #include "wad.h"
42
43 // Win32 requires us to add O_BINARY, but the other OSes don't have it
44 #ifndef O_BINARY
45 # define O_BINARY 0
46 #endif
47
48 // In case the system doesn't support the O_NONBLOCK flag
49 #ifndef O_NONBLOCK
50 # define O_NONBLOCK 0
51 #endif
52
53 // largefile support for Win32
54 #ifdef WIN32
55 # define lseek _lseeki64
56 #endif
57
58 /*
59
60 All of Quake's data access is through a hierchal file system, but the contents
61 of the file system can be transparently merged from several sources.
62
63 The "base directory" is the path to the directory holding the quake.exe and
64 all game directories.  The sys_* files pass this to host_init in
65 quakeparms_t->basedir.  This can be overridden with the "-basedir" command
66 line parm to allow code debugging in a different directory.  The base
67 directory is only used during filesystem initialization.
68
69 The "game directory" is the first tree on the search path and directory that
70 all generated files (savegames, screenshots, demos, config files) will be
71 saved to.  This can be overridden with the "-game" command line parameter.
72 The game directory can never be changed while quake is executing.  This is a
73 precaution against having a malicious server instruct clients to write files
74 over areas they shouldn't.
75
76 */
77
78
79 /*
80 =============================================================================
81
82 CONSTANTS
83
84 =============================================================================
85 */
86
87 // Magic numbers of a ZIP file (big-endian format)
88 #define ZIP_DATA_HEADER 0x504B0304  // "PK\3\4"
89 #define ZIP_CDIR_HEADER 0x504B0102  // "PK\1\2"
90 #define ZIP_END_HEADER  0x504B0506  // "PK\5\6"
91
92 // Other constants for ZIP files
93 #define ZIP_MAX_COMMENTS_SIZE           ((unsigned short)0xFFFF)
94 #define ZIP_END_CDIR_SIZE                       22
95 #define ZIP_CDIR_CHUNK_BASE_SIZE        46
96 #define ZIP_LOCAL_CHUNK_BASE_SIZE       30
97
98 // Zlib constants (from zlib.h)
99 #define Z_SYNC_FLUSH    2
100 #define MAX_WBITS               15
101 #define Z_OK                    0
102 #define Z_STREAM_END    1
103 #define ZLIB_VERSION    "1.2.3"
104
105 // Uncomment the following line if the zlib DLL you have still uses
106 // the 1.1.x series calling convention on Win32 (WINAPI)
107 //#define ZLIB_USES_WINAPI
108
109
110 /*
111 =============================================================================
112
113 TYPES
114
115 =============================================================================
116 */
117
118 // Zlib stream (from zlib.h)
119 // Warning: some pointers we don't use directly have
120 // been cast to "void*" for a matter of simplicity
121 typedef struct
122 {
123         unsigned char                   *next_in;       // next input byte
124         unsigned int    avail_in;       // number of bytes available at next_in
125         unsigned long   total_in;       // total nb of input bytes read so far
126
127         unsigned char                   *next_out;      // next output byte should be put there
128         unsigned int    avail_out;      // remaining free space at next_out
129         unsigned long   total_out;      // total nb of bytes output so far
130
131         char                    *msg;           // last error message, NULL if no error
132         void                    *state;         // not visible by applications
133
134         void                    *zalloc;        // used to allocate the internal state
135         void                    *zfree;         // used to free the internal state
136         void                    *opaque;        // private data object passed to zalloc and zfree
137
138         int                             data_type;      // best guess about the data type: ascii or binary
139         unsigned long   adler;          // adler32 value of the uncompressed data
140         unsigned long   reserved;       // reserved for future use
141 } z_stream;
142
143
144 // inside a package (PAK or PK3)
145 #define QFILE_FLAG_PACKED (1 << 0)
146 // file is compressed using the deflate algorithm (PK3 only)
147 #define QFILE_FLAG_DEFLATED (1 << 1)
148
149 #define FILE_BUFF_SIZE 2048
150 typedef struct
151 {
152         z_stream        zstream;
153         size_t          comp_length;                    // length of the compressed file
154         size_t          in_ind, in_len;                 // input buffer current index and length
155         size_t          in_position;                    // position in the compressed file
156         unsigned char           input [FILE_BUFF_SIZE];
157 } ztoolkit_t;
158
159 struct qfile_s
160 {
161         int                             flags;
162         int                             handle;                                 // file descriptor
163         fs_offset_t             real_length;                    // uncompressed file size (for files opened in "read" mode)
164         fs_offset_t             position;                               // current position in the file
165         fs_offset_t             offset;                                 // offset into the package (0 if external file)
166         int                             ungetc;                                 // single stored character from ungetc, cleared to EOF when read
167
168         // Contents buffer
169         fs_offset_t             buff_ind, buff_len;             // buffer current index and length
170         unsigned char                   buff [FILE_BUFF_SIZE];
171
172         // For zipped files
173         ztoolkit_t*             ztk;
174 };
175
176
177 // ------ PK3 files on disk ------ //
178
179 // You can get the complete ZIP format description from PKWARE website
180
181 typedef struct pk3_endOfCentralDir_s
182 {
183         unsigned int signature;
184         unsigned short disknum;
185         unsigned short cdir_disknum;    // number of the disk with the start of the central directory
186         unsigned short localentries;    // number of entries in the central directory on this disk
187         unsigned short nbentries;               // total number of entries in the central directory on this disk
188         unsigned int cdir_size;                 // size of the central directory
189         unsigned int cdir_offset;               // with respect to the starting disk number
190         unsigned short comment_size;
191 } pk3_endOfCentralDir_t;
192
193
194 // ------ PAK files on disk ------ //
195 typedef struct dpackfile_s
196 {
197         char name[56];
198         int filepos, filelen;
199 } dpackfile_t;
200
201 typedef struct dpackheader_s
202 {
203         char id[4];
204         int dirofs;
205         int dirlen;
206 } dpackheader_t;
207
208
209 // Packages in memory
210 // the offset in packfile_t is the true contents offset
211 #define PACKFILE_FLAG_TRUEOFFS (1 << 0)
212 // file compressed using the deflate algorithm
213 #define PACKFILE_FLAG_DEFLATED (1 << 1)
214
215 typedef struct packfile_s
216 {
217         char name [MAX_QPATH];
218         int flags;
219         fs_offset_t offset;
220         fs_offset_t packsize;   // size in the package
221         fs_offset_t realsize;   // real file size (uncompressed)
222 } packfile_t;
223
224 typedef struct pack_s
225 {
226         char filename [MAX_OSPATH];
227         int handle;
228         int ignorecase;  // PK3 ignores case
229         int numfiles;
230         packfile_t *files;
231 } pack_t;
232
233
234 // Search paths for files (including packages)
235 typedef struct searchpath_s
236 {
237         // only one of filename / pack will be used
238         char filename[MAX_OSPATH];
239         pack_t *pack;
240         struct searchpath_s *next;
241 } searchpath_t;
242
243
244 /*
245 =============================================================================
246
247 FUNCTION PROTOTYPES
248
249 =============================================================================
250 */
251
252 void FS_Dir_f(void);
253 void FS_Ls_f(void);
254
255 static searchpath_t *FS_FindFile (const char *name, int* index, qboolean quiet);
256 static packfile_t* FS_AddFileToPack (const char* name, pack_t* pack,
257                                                                         fs_offset_t offset, fs_offset_t packsize,
258                                                                         fs_offset_t realsize, int flags);
259
260
261 /*
262 =============================================================================
263
264 VARIABLES
265
266 =============================================================================
267 */
268
269 mempool_t *fs_mempool;
270
271 searchpath_t *fs_searchpaths = NULL;
272
273 #define MAX_FILES_IN_PACK       65536
274
275 char fs_gamedir[MAX_OSPATH];
276 char fs_basedir[MAX_OSPATH];
277
278 // list of active game directories (empty if not running a mod)
279 int fs_numgamedirs = 0;
280 char fs_gamedirs[MAX_GAMEDIRS][MAX_QPATH];
281
282 cvar_t scr_screenshot_name = {0, "scr_screenshot_name","dp", "prefix name for saved screenshots (changes based on -game commandline, as well as which game mode is running)"};
283 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"};
284
285
286 /*
287 =============================================================================
288
289 PRIVATE FUNCTIONS - PK3 HANDLING
290
291 =============================================================================
292 */
293
294 // Functions exported from zlib
295 #if defined(WIN32) && defined(ZLIB_USES_WINAPI)
296 # define ZEXPORT WINAPI
297 #else
298 # define ZEXPORT
299 #endif
300
301 static int (ZEXPORT *qz_inflate) (z_stream* strm, int flush);
302 static int (ZEXPORT *qz_inflateEnd) (z_stream* strm);
303 static int (ZEXPORT *qz_inflateInit2_) (z_stream* strm, int windowBits, const char *version, int stream_size);
304 static int (ZEXPORT *qz_inflateReset) (z_stream* strm);
305
306 #define qz_inflateInit2(strm, windowBits) \
307         qz_inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
308
309 static dllfunction_t zlibfuncs[] =
310 {
311         {"inflate",                     (void **) &qz_inflate},
312         {"inflateEnd",          (void **) &qz_inflateEnd},
313         {"inflateInit2_",       (void **) &qz_inflateInit2_},
314         {"inflateReset",        (void **) &qz_inflateReset},
315         {NULL, NULL}
316 };
317
318 // Handle for Zlib DLL
319 static dllhandle_t zlib_dll = NULL;
320
321
322 /*
323 ====================
324 PK3_CloseLibrary
325
326 Unload the Zlib DLL
327 ====================
328 */
329 void PK3_CloseLibrary (void)
330 {
331         Sys_UnloadLibrary (&zlib_dll);
332 }
333
334
335 /*
336 ====================
337 PK3_OpenLibrary
338
339 Try to load the Zlib DLL
340 ====================
341 */
342 qboolean PK3_OpenLibrary (void)
343 {
344         const char* dllnames [] =
345         {
346 #if defined(WIN64)
347                 "zlib64.dll",
348 #elif defined(WIN32)
349 # ifdef ZLIB_USES_WINAPI
350                 "zlibwapi.dll",
351                 "zlib.dll",
352 # else
353                 "zlib1.dll",
354 # endif
355 #elif defined(MACOSX)
356                 "libz.dylib",
357 #else
358                 "libz.so.1",
359                 "libz.so",
360 #endif
361                 NULL
362         };
363
364         // Already loaded?
365         if (zlib_dll)
366                 return true;
367
368         // Load the DLL
369         return Sys_LoadLibrary (dllnames, &zlib_dll, zlibfuncs);
370 }
371
372
373 /*
374 ====================
375 PK3_GetEndOfCentralDir
376
377 Extract the end of the central directory from a PK3 package
378 ====================
379 */
380 qboolean PK3_GetEndOfCentralDir (const char *packfile, int packhandle, pk3_endOfCentralDir_t *eocd)
381 {
382         fs_offset_t filesize, maxsize;
383         unsigned char *buffer, *ptr;
384         int ind;
385
386         // Get the package size
387         filesize = lseek (packhandle, 0, SEEK_END);
388         if (filesize < ZIP_END_CDIR_SIZE)
389                 return false;
390
391         // Load the end of the file in memory
392         if (filesize < ZIP_MAX_COMMENTS_SIZE + ZIP_END_CDIR_SIZE)
393                 maxsize = filesize;
394         else
395                 maxsize = ZIP_MAX_COMMENTS_SIZE + ZIP_END_CDIR_SIZE;
396         buffer = (unsigned char *)Mem_Alloc (tempmempool, maxsize);
397         lseek (packhandle, filesize - maxsize, SEEK_SET);
398         if (read (packhandle, buffer, maxsize) != (fs_offset_t) maxsize)
399         {
400                 Mem_Free (buffer);
401                 return false;
402         }
403
404         // Look for the end of central dir signature around the end of the file
405         maxsize -= ZIP_END_CDIR_SIZE;
406         ptr = &buffer[maxsize];
407         ind = 0;
408         while (BuffBigLong (ptr) != ZIP_END_HEADER)
409         {
410                 if (ind == maxsize)
411                 {
412                         Mem_Free (buffer);
413                         return false;
414                 }
415
416                 ind++;
417                 ptr--;
418         }
419
420         memcpy (eocd, ptr, ZIP_END_CDIR_SIZE);
421         eocd->signature = LittleLong (eocd->signature);
422         eocd->disknum = LittleShort (eocd->disknum);
423         eocd->cdir_disknum = LittleShort (eocd->cdir_disknum);
424         eocd->localentries = LittleShort (eocd->localentries);
425         eocd->nbentries = LittleShort (eocd->nbentries);
426         eocd->cdir_size = LittleLong (eocd->cdir_size);
427         eocd->cdir_offset = LittleLong (eocd->cdir_offset);
428         eocd->comment_size = LittleShort (eocd->comment_size);
429
430         Mem_Free (buffer);
431
432         return true;
433 }
434
435
436 /*
437 ====================
438 PK3_BuildFileList
439
440 Extract the file list from a PK3 file
441 ====================
442 */
443 int PK3_BuildFileList (pack_t *pack, const pk3_endOfCentralDir_t *eocd)
444 {
445         unsigned char *central_dir, *ptr;
446         unsigned int ind;
447         fs_offset_t remaining;
448
449         // Load the central directory in memory
450         central_dir = (unsigned char *)Mem_Alloc (tempmempool, eocd->cdir_size);
451         lseek (pack->handle, eocd->cdir_offset, SEEK_SET);
452         read (pack->handle, central_dir, eocd->cdir_size);
453
454         // Extract the files properties
455         // The parsing is done "by hand" because some fields have variable sizes and
456         // the constant part isn't 4-bytes aligned, which makes the use of structs difficult
457         remaining = eocd->cdir_size;
458         pack->numfiles = 0;
459         ptr = central_dir;
460         for (ind = 0; ind < eocd->nbentries; ind++)
461         {
462                 fs_offset_t namesize, count;
463
464                 // Checking the remaining size
465                 if (remaining < ZIP_CDIR_CHUNK_BASE_SIZE)
466                 {
467                         Mem_Free (central_dir);
468                         return -1;
469                 }
470                 remaining -= ZIP_CDIR_CHUNK_BASE_SIZE;
471
472                 // Check header
473                 if (BuffBigLong (ptr) != ZIP_CDIR_HEADER)
474                 {
475                         Mem_Free (central_dir);
476                         return -1;
477                 }
478
479                 namesize = BuffLittleShort (&ptr[28]);  // filename length
480
481                 // Check encryption, compression, and attributes
482                 // 1st uint8  : general purpose bit flag
483                 //    Check bits 0 (encryption), 3 (data descriptor after the file), and 5 (compressed patched data (?))
484                 // 2nd uint8 : external file attributes
485                 //    Check bits 3 (file is a directory) and 5 (file is a volume (?))
486                 if ((ptr[8] & 0x29) == 0 && (ptr[38] & 0x18) == 0)
487                 {
488                         // Still enough bytes for the name?
489                         if (remaining < namesize || namesize >= (int)sizeof (*pack->files))
490                         {
491                                 Mem_Free (central_dir);
492                                 return -1;
493                         }
494
495                         // WinZip doesn't use the "directory" attribute, so we need to check the name directly
496                         if (ptr[ZIP_CDIR_CHUNK_BASE_SIZE + namesize - 1] != '/')
497                         {
498                                 char filename [sizeof (pack->files[0].name)];
499                                 fs_offset_t offset, packsize, realsize;
500                                 int flags;
501
502                                 // Extract the name (strip it if necessary)
503                                 namesize = min(namesize, (int)sizeof (filename) - 1);
504                                 memcpy (filename, &ptr[ZIP_CDIR_CHUNK_BASE_SIZE], namesize);
505                                 filename[namesize] = '\0';
506
507                                 if (BuffLittleShort (&ptr[10]))
508                                         flags = PACKFILE_FLAG_DEFLATED;
509                                 else
510                                         flags = 0;
511                                 offset = BuffLittleLong (&ptr[42]);
512                                 packsize = BuffLittleLong (&ptr[20]);
513                                 realsize = BuffLittleLong (&ptr[24]);
514                                 FS_AddFileToPack (filename, pack, offset, packsize, realsize, flags);
515                         }
516                 }
517
518                 // Skip the name, additionnal field, and comment
519                 // 1er uint16 : extra field length
520                 // 2eme uint16 : file comment length
521                 count = namesize + BuffLittleShort (&ptr[30]) + BuffLittleShort (&ptr[32]);
522                 ptr += ZIP_CDIR_CHUNK_BASE_SIZE + count;
523                 remaining -= count;
524         }
525
526         // If the package is empty, central_dir is NULL here
527         if (central_dir != NULL)
528                 Mem_Free (central_dir);
529         return pack->numfiles;
530 }
531
532
533 /*
534 ====================
535 FS_LoadPackPK3
536
537 Create a package entry associated with a PK3 file
538 ====================
539 */
540 pack_t *FS_LoadPackPK3 (const char *packfile)
541 {
542         int packhandle;
543         pk3_endOfCentralDir_t eocd;
544         pack_t *pack;
545         int real_nb_files;
546
547         packhandle = open (packfile, O_RDONLY | O_BINARY);
548         if (packhandle < 0)
549                 return NULL;
550
551         if (! PK3_GetEndOfCentralDir (packfile, packhandle, &eocd))
552         {
553                 Con_Printf ("%s is not a PK3 file\n", packfile);
554                 close(packhandle);
555                 return NULL;
556         }
557
558         // Multi-volume ZIP archives are NOT allowed
559         if (eocd.disknum != 0 || eocd.cdir_disknum != 0)
560         {
561                 Con_Printf ("%s is a multi-volume ZIP archive\n", packfile);
562                 close(packhandle);
563                 return NULL;
564         }
565
566         // We only need to do this test if MAX_FILES_IN_PACK is lesser than 65535
567         // since eocd.nbentries is an unsigned 16 bits integer
568 #if MAX_FILES_IN_PACK < 65535
569         if (eocd.nbentries > MAX_FILES_IN_PACK)
570         {
571                 Con_Printf ("%s contains too many files (%hu)\n", packfile, eocd.nbentries);
572                 close(packhandle);
573                 return NULL;
574         }
575 #endif
576
577         // Create a package structure in memory
578         pack = (pack_t *)Mem_Alloc(fs_mempool, sizeof (pack_t));
579         pack->ignorecase = true; // PK3 ignores case
580         strlcpy (pack->filename, packfile, sizeof (pack->filename));
581         pack->handle = packhandle;
582         pack->numfiles = eocd.nbentries;
583         pack->files = (packfile_t *)Mem_Alloc(fs_mempool, eocd.nbentries * sizeof(packfile_t));
584
585         real_nb_files = PK3_BuildFileList (pack, &eocd);
586         if (real_nb_files < 0)
587         {
588                 Con_Printf ("%s is not a valid PK3 file\n", packfile);
589                 close(pack->handle);
590                 Mem_Free(pack);
591                 return NULL;
592         }
593
594         Con_Printf("Added packfile %s (%i files)\n", packfile, real_nb_files);
595         return pack;
596 }
597
598
599 /*
600 ====================
601 PK3_GetTrueFileOffset
602
603 Find where the true file data offset is
604 ====================
605 */
606 qboolean PK3_GetTrueFileOffset (packfile_t *pfile, pack_t *pack)
607 {
608         unsigned char buffer [ZIP_LOCAL_CHUNK_BASE_SIZE];
609         fs_offset_t count;
610
611         // Already found?
612         if (pfile->flags & PACKFILE_FLAG_TRUEOFFS)
613                 return true;
614
615         // Load the local file description
616         lseek (pack->handle, pfile->offset, SEEK_SET);
617         count = read (pack->handle, buffer, ZIP_LOCAL_CHUNK_BASE_SIZE);
618         if (count != ZIP_LOCAL_CHUNK_BASE_SIZE || BuffBigLong (buffer) != ZIP_DATA_HEADER)
619         {
620                 Con_Printf ("Can't retrieve file %s in package %s\n", pfile->name, pack->filename);
621                 return false;
622         }
623
624         // Skip name and extra field
625         pfile->offset += BuffLittleShort (&buffer[26]) + BuffLittleShort (&buffer[28]) + ZIP_LOCAL_CHUNK_BASE_SIZE;
626
627         pfile->flags |= PACKFILE_FLAG_TRUEOFFS;
628         return true;
629 }
630
631
632 /*
633 =============================================================================
634
635 OTHER PRIVATE FUNCTIONS
636
637 =============================================================================
638 */
639
640
641 /*
642 ====================
643 FS_AddFileToPack
644
645 Add a file to the list of files contained into a package
646 ====================
647 */
648 static packfile_t* FS_AddFileToPack (const char* name, pack_t* pack,
649                                                                          fs_offset_t offset, fs_offset_t packsize,
650                                                                          fs_offset_t realsize, int flags)
651 {
652         int (*strcmp_funct) (const char* str1, const char* str2);
653         int left, right, middle;
654         packfile_t *pfile;
655
656         strcmp_funct = pack->ignorecase ? strcasecmp : strcmp;
657
658         // Look for the slot we should put that file into (binary search)
659         left = 0;
660         right = pack->numfiles - 1;
661         while (left <= right)
662         {
663                 int diff;
664
665                 middle = (left + right) / 2;
666                 diff = strcmp_funct (pack->files[middle].name, name);
667
668                 // If we found the file, there's a problem
669                 if (!diff)
670                         Con_Printf ("Package %s contains the file %s several times\n", pack->filename, name);
671
672                 // If we're too far in the list
673                 if (diff > 0)
674                         right = middle - 1;
675                 else
676                         left = middle + 1;
677         }
678
679         // We have to move the right of the list by one slot to free the one we need
680         pfile = &pack->files[left];
681         memmove (pfile + 1, pfile, (pack->numfiles - left) * sizeof (*pfile));
682         pack->numfiles++;
683
684         strlcpy (pfile->name, name, sizeof (pfile->name));
685         pfile->offset = offset;
686         pfile->packsize = packsize;
687         pfile->realsize = realsize;
688         pfile->flags = flags;
689
690         return pfile;
691 }
692
693
694 /*
695 ============
696 FS_CreatePath
697
698 Only used for FS_Open.
699 ============
700 */
701 void FS_CreatePath (char *path)
702 {
703         char *ofs, save;
704
705         for (ofs = path+1 ; *ofs ; ofs++)
706         {
707                 if (*ofs == '/' || *ofs == '\\')
708                 {
709                         // create the directory
710                         save = *ofs;
711                         *ofs = 0;
712                         FS_mkdir (path);
713                         *ofs = save;
714                 }
715         }
716 }
717
718
719 /*
720 ============
721 FS_Path_f
722
723 ============
724 */
725 void FS_Path_f (void)
726 {
727         searchpath_t *s;
728
729         Con_Print("Current search path:\n");
730         for (s=fs_searchpaths ; s ; s=s->next)
731         {
732                 if (s->pack)
733                         Con_Printf("%s (%i files)\n", s->pack->filename, s->pack->numfiles);
734                 else
735                         Con_Printf("%s\n", s->filename);
736         }
737 }
738
739
740 /*
741 =================
742 FS_LoadPackPAK
743
744 Takes an explicit (not game tree related) path to a pak file.
745
746 Loads the header and directory, adding the files at the beginning
747 of the list so they override previous pack files.
748 =================
749 */
750 pack_t *FS_LoadPackPAK (const char *packfile)
751 {
752         dpackheader_t header;
753         int i, numpackfiles;
754         int packhandle;
755         pack_t *pack;
756         dpackfile_t *info;
757
758         packhandle = open (packfile, O_RDONLY | O_BINARY);
759         if (packhandle < 0)
760                 return NULL;
761         read (packhandle, (void *)&header, sizeof(header));
762         if (memcmp(header.id, "PACK", 4))
763         {
764                 Con_Printf ("%s is not a packfile\n", packfile);
765                 close(packhandle);
766                 return NULL;
767         }
768         header.dirofs = LittleLong (header.dirofs);
769         header.dirlen = LittleLong (header.dirlen);
770
771         if (header.dirlen % sizeof(dpackfile_t))
772         {
773                 Con_Printf ("%s has an invalid directory size\n", packfile);
774                 close(packhandle);
775                 return NULL;
776         }
777
778         numpackfiles = header.dirlen / sizeof(dpackfile_t);
779
780         if (numpackfiles > MAX_FILES_IN_PACK)
781         {
782                 Con_Printf ("%s has %i files\n", packfile, numpackfiles);
783                 close(packhandle);
784                 return NULL;
785         }
786
787         info = (dpackfile_t *)Mem_Alloc(tempmempool, sizeof(*info) * numpackfiles);
788         lseek (packhandle, header.dirofs, SEEK_SET);
789         if(header.dirlen != read (packhandle, (void *)info, header.dirlen))
790         {
791                 Con_Printf("%s is an incomplete PAK, not loading\n", packfile);
792                 Mem_Free(info);
793                 close(packhandle);
794                 return NULL;
795         }
796
797         pack = (pack_t *)Mem_Alloc(fs_mempool, sizeof (pack_t));
798         pack->ignorecase = false; // PAK is case sensitive
799         strlcpy (pack->filename, packfile, sizeof (pack->filename));
800         pack->handle = packhandle;
801         pack->numfiles = 0;
802         pack->files = (packfile_t *)Mem_Alloc(fs_mempool, numpackfiles * sizeof(packfile_t));
803
804         // parse the directory
805         for (i = 0;i < numpackfiles;i++)
806         {
807                 fs_offset_t offset = LittleLong (info[i].filepos);
808                 fs_offset_t size = LittleLong (info[i].filelen);
809
810                 FS_AddFileToPack (info[i].name, pack, offset, size, size, PACKFILE_FLAG_TRUEOFFS);
811         }
812
813         Mem_Free(info);
814
815         Con_Printf("Added packfile %s (%i files)\n", packfile, numpackfiles);
816         return pack;
817 }
818
819 /*
820 ================
821 FS_AddPack_Fullpath
822
823 Adds the given pack to the search path.
824 The pack type is autodetected by the file extension.
825
826 Returns true if the file was successfully added to the
827 search path or if it was already included.
828
829 If keep_plain_dirs is set, the pack will be added AFTER the first sequence of
830 plain directories.
831 ================
832 */
833 static qboolean FS_AddPack_Fullpath(const char *pakfile, qboolean *already_loaded, qboolean keep_plain_dirs)
834 {
835         searchpath_t *search;
836         pack_t *pak = NULL;
837         const char *ext = FS_FileExtension(pakfile);
838
839         for(search = fs_searchpaths; search; search = search->next)
840         {
841                 if(search->pack && !strcasecmp(search->pack->filename, pakfile))
842                 {
843                         if(already_loaded)
844                                 *already_loaded = true;
845                         return true; // already loaded
846                 }
847         }
848
849         if(already_loaded)
850                 *already_loaded = false;
851
852         if(!strcasecmp(ext, "pak"))
853                 pak = FS_LoadPackPAK (pakfile);
854         else if(!strcasecmp(ext, "pk3"))
855                 pak = FS_LoadPackPK3 (pakfile);
856         else
857                 Con_Printf("\"%s\" does not have a pack extension\n", pakfile);
858
859         if (pak)
860         {
861                 if(keep_plain_dirs)
862                 {
863                         // find the first item whose next one is a pack or NULL
864                         searchpath_t *insertion_point = 0;
865                         if(fs_searchpaths && !fs_searchpaths->pack)
866                         {
867                                 insertion_point = fs_searchpaths;
868                                 for(;;)
869                                 {
870                                         if(!insertion_point->next)
871                                                 break;
872                                         if(insertion_point->next->pack)
873                                                 break;
874                                         insertion_point = insertion_point->next;
875                                 }
876                         }
877                         // If insertion_point is NULL, this means that either there is no
878                         // item in the list yet, or that the very first item is a pack. In
879                         // that case, we want to insert at the beginning...
880                         if(!insertion_point)
881                         {
882                                 search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
883                                 search->pack = pak;
884                                 search->next = fs_searchpaths;
885                                 fs_searchpaths = search;
886                         }
887                         else
888                         // otherwise we want to append directly after insertion_point.
889                         {
890                                 search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
891                                 search->pack = pak;
892                                 search->next = insertion_point->next;
893                                 insertion_point->next = search;
894                         }
895                 }
896                 else
897                 {
898                         search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
899                         search->pack = pak;
900                         search->next = fs_searchpaths;
901                         fs_searchpaths = search;
902                 }
903                 return true;
904         }
905         else
906         {
907                 Con_Printf("unable to load pak \"%s\"\n", pakfile);
908                 return false;
909         }
910 }
911
912
913 /*
914 ================
915 FS_AddPack
916
917 Adds the given pack to the search path and searches for it in the game path.
918 The pack type is autodetected by the file extension.
919
920 Returns true if the file was successfully added to the
921 search path or if it was already included.
922
923 If keep_plain_dirs is set, the pack will be added AFTER the first sequence of
924 plain directories.
925 ================
926 */
927 qboolean FS_AddPack(const char *pakfile, qboolean *already_loaded, qboolean keep_plain_dirs)
928 {
929         char fullpath[MAX_QPATH];
930         int index;
931         searchpath_t *search;
932
933         if(already_loaded)
934                 *already_loaded = false;
935
936         // then find the real name...
937         search = FS_FindFile(pakfile, &index, true);
938         if(!search || search->pack)
939         {
940                 Con_Printf("could not find pak \"%s\"\n", pakfile);
941                 return false;
942         }
943
944         dpsnprintf(fullpath, sizeof(fullpath), "%s%s", search->filename, pakfile);
945
946         return FS_AddPack_Fullpath(fullpath, already_loaded, keep_plain_dirs);
947 }
948
949
950 /*
951 ================
952 FS_AddGameDirectory
953
954 Sets fs_gamedir, adds the directory to the head of the path,
955 then loads and adds pak1.pak pak2.pak ...
956 ================
957 */
958 void FS_AddGameDirectory (const char *dir)
959 {
960         int i;
961         stringlist_t list;
962         searchpath_t *search;
963
964         strlcpy (fs_gamedir, dir, sizeof (fs_gamedir));
965
966         stringlistinit(&list);
967         listdirectory(&list, "", dir);
968         stringlistsort(&list);
969
970         // add any PAK package in the directory
971         for (i = 0;i < list.numstrings;i++)
972         {
973                 if (!strcasecmp(FS_FileExtension(list.strings[i]), "pak"))
974                 {
975                         FS_AddPack_Fullpath(list.strings[i], NULL, false);
976                 }
977         }
978
979         // add any PK3 package in the directory
980         for (i = 0;i < list.numstrings;i++)
981         {
982                 if (!strcasecmp(FS_FileExtension(list.strings[i]), "pk3"))
983                 {
984                         FS_AddPack_Fullpath(list.strings[i], NULL, false);
985                 }
986         }
987
988         stringlistfreecontents(&list);
989
990         // Add the directory to the search path
991         // (unpacked files have the priority over packed files)
992         search = (searchpath_t *)Mem_Alloc(fs_mempool, sizeof(searchpath_t));
993         strlcpy (search->filename, dir, sizeof (search->filename));
994         search->next = fs_searchpaths;
995         fs_searchpaths = search;
996 }
997
998
999 /*
1000 ================
1001 FS_AddGameHierarchy
1002 ================
1003 */
1004 void FS_AddGameHierarchy (const char *dir)
1005 {
1006         int i;
1007         char userdir[MAX_QPATH];
1008 #ifdef WIN32
1009         TCHAR mydocsdir[MAX_PATH + 1];
1010 #else
1011         const char *homedir;
1012 #endif
1013
1014         // Add the common game directory
1015         FS_AddGameDirectory (va("%s%s/", fs_basedir, dir));
1016
1017         *userdir = 0;
1018
1019         // Add the personal game directory
1020 #ifdef WIN32
1021         if(SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, mydocsdir) == S_OK)
1022                 dpsnprintf(userdir, sizeof(userdir), "%s/My Games/%s/", mydocsdir, gameuserdirname);
1023 #else
1024         homedir = getenv ("HOME");
1025         if(homedir)
1026                 dpsnprintf(userdir, sizeof(userdir), "%s/.%s/", homedir, gameuserdirname);
1027 #endif
1028
1029 #ifdef WIN32
1030         if(!COM_CheckParm("-mygames"))
1031         {
1032                 int fd = open (va("%s%s/config.cfg", fs_basedir, dir), O_WRONLY | O_CREAT, 0666); // note: no O_TRUNC here!
1033                 if(fd >= 0)
1034                 {
1035                         close(fd);
1036                         *userdir = 0; // we have write access to the game dir, so let's use it
1037                 }
1038         }
1039 #endif
1040
1041         if(COM_CheckParm("-nohome"))
1042                 *userdir = 0;
1043
1044         if((i = COM_CheckParm("-userdir")) && i < com_argc - 1)
1045                 dpsnprintf(userdir, sizeof(userdir), "%s/", com_argv[i+1]);
1046
1047         if (*userdir)
1048                 FS_AddGameDirectory(va("%s%s/", userdir, dir));
1049 }
1050
1051
1052 /*
1053 ============
1054 FS_FileExtension
1055 ============
1056 */
1057 const char *FS_FileExtension (const char *in)
1058 {
1059         const char *separator, *backslash, *colon, *dot;
1060
1061         separator = strrchr(in, '/');
1062         backslash = strrchr(in, '\\');
1063         if (!separator || separator < backslash)
1064                 separator = backslash;
1065         colon = strrchr(in, ':');
1066         if (!separator || separator < colon)
1067                 separator = colon;
1068
1069         dot = strrchr(in, '.');
1070         if (dot == NULL || (separator && (dot < separator)))
1071                 return "";
1072
1073         return dot + 1;
1074 }
1075
1076
1077 /*
1078 ============
1079 FS_FileWithoutPath
1080 ============
1081 */
1082 const char *FS_FileWithoutPath (const char *in)
1083 {
1084         const char *separator, *backslash, *colon;
1085
1086         separator = strrchr(in, '/');
1087         backslash = strrchr(in, '\\');
1088         if (!separator || separator < backslash)
1089                 separator = backslash;
1090         colon = strrchr(in, ':');
1091         if (!separator || separator < colon)
1092                 separator = colon;
1093         return separator ? separator + 1 : in;
1094 }
1095
1096
1097 /*
1098 ================
1099 FS_ClearSearchPath
1100 ================
1101 */
1102 void FS_ClearSearchPath (void)
1103 {
1104         // unload all packs and directory information, close all pack files
1105         // (if a qfile is still reading a pack it won't be harmed because it used
1106         //  dup() to get its own handle already)
1107         while (fs_searchpaths)
1108         {
1109                 searchpath_t *search = fs_searchpaths;
1110                 fs_searchpaths = search->next;
1111                 if (search->pack)
1112                 {
1113                         // close the file
1114                         close(search->pack->handle);
1115                         // free any memory associated with it
1116                         if (search->pack->files)
1117                                 Mem_Free(search->pack->files);
1118                         Mem_Free(search->pack);
1119                 }
1120                 Mem_Free(search);
1121         }
1122 }
1123
1124
1125 /*
1126 ================
1127 FS_Rescan
1128 ================
1129 */
1130 void FS_Rescan (void)
1131 {
1132         int i;
1133         qboolean fs_modified = false;
1134
1135         FS_ClearSearchPath();
1136
1137         // add the game-specific paths
1138         // gamedirname1 (typically id1)
1139         FS_AddGameHierarchy (gamedirname1);
1140         // update the com_modname (used for server info)
1141         strlcpy(com_modname, gamedirname1, sizeof(com_modname));
1142
1143         // add the game-specific path, if any
1144         // (only used for mission packs and the like, which should set fs_modified)
1145         if (gamedirname2)
1146         {
1147                 fs_modified = true;
1148                 FS_AddGameHierarchy (gamedirname2);
1149         }
1150
1151         // -game <gamedir>
1152         // Adds basedir/gamedir as an override game
1153         // LordHavoc: now supports multiple -game directories
1154         // set the com_modname (reported in server info)
1155         for (i = 0;i < fs_numgamedirs;i++)
1156         {
1157                 fs_modified = true;
1158                 FS_AddGameHierarchy (fs_gamedirs[i]);
1159                 // update the com_modname (used server info)
1160                 strlcpy (com_modname, fs_gamedirs[i], sizeof (com_modname));
1161         }
1162
1163         // set the default screenshot name to either the mod name or the
1164         // gamemode screenshot name
1165         if (strcmp(com_modname, gamedirname1))
1166                 Cvar_SetQuick (&scr_screenshot_name, com_modname);
1167         else
1168                 Cvar_SetQuick (&scr_screenshot_name, gamescreenshotname);
1169
1170         // If "-condebug" is in the command line, remove the previous log file
1171         if (COM_CheckParm ("-condebug") != 0)
1172                 unlink (va("%s/qconsole.log", fs_gamedir));
1173
1174         // look for the pop.lmp file and set registered to true if it is found
1175         if ((gamemode == GAME_NORMAL || gamemode == GAME_HIPNOTIC || gamemode == GAME_ROGUE) && !FS_FileExists("gfx/pop.lmp"))
1176         {
1177                 if (fs_modified)
1178                         Con_Print("Playing shareware version, with modification.\nwarning: most mods require full quake data.\n");
1179                 else
1180                         Con_Print("Playing shareware version.\n");
1181         }
1182         else
1183         {
1184                 Cvar_Set ("registered", "1");
1185                 if (gamemode == GAME_NORMAL || gamemode == GAME_HIPNOTIC || gamemode == GAME_ROGUE)
1186                         Con_Print("Playing registered version.\n");
1187         }
1188
1189         // unload all wads so that future queries will return the new data
1190         W_UnloadAll();
1191 }
1192
1193 void FS_Rescan_f(void)
1194 {
1195         FS_Rescan();
1196 }
1197
1198 /*
1199 ================
1200 FS_ChangeGameDirs
1201 ================
1202 */
1203 extern void Host_SaveConfig (void);
1204 extern void Host_LoadConfig_f (void);
1205 qboolean FS_ChangeGameDirs(int numgamedirs, char gamedirs[][MAX_QPATH], qboolean complain, qboolean failmissing)
1206 {
1207         int i;
1208
1209         if (fs_numgamedirs == numgamedirs)
1210         {
1211                 for (i = 0;i < numgamedirs;i++)
1212                         if (strcasecmp(fs_gamedirs[i], gamedirs[i]))
1213                                 break;
1214                 if (i == numgamedirs)
1215                         return true; // already using this set of gamedirs, do nothing
1216         }
1217
1218         if (numgamedirs > MAX_GAMEDIRS)
1219         {
1220                 if (complain)
1221                         Con_Printf("That is too many gamedirs (%i > %i)\n", numgamedirs, MAX_GAMEDIRS);
1222                 return false; // too many gamedirs
1223         }
1224
1225         for (i = 0;i < numgamedirs;i++)
1226         {
1227                 // if string is nasty, reject it
1228                 if(FS_CheckNastyPath(gamedirs[i], true))
1229                 {
1230                         if (complain)
1231                                 Con_Printf("Nasty gamedir name rejected: %s\n", gamedirs[i]);
1232                         return false; // nasty gamedirs
1233                 }
1234         }
1235
1236         for (i = 0;i < numgamedirs;i++)
1237         {
1238                 if (!FS_CheckGameDir(gamedirs[i]) && failmissing)
1239                 {
1240                         if (complain)
1241                                 Con_Printf("Gamedir missing: %s%s/\n", fs_basedir, gamedirs[i]);
1242                         return false; // missing gamedirs
1243                 }
1244         }
1245
1246         Host_SaveConfig();
1247
1248         fs_numgamedirs = numgamedirs;
1249         for (i = 0;i < fs_numgamedirs;i++)
1250                 strlcpy(fs_gamedirs[i], gamedirs[i], sizeof(fs_gamedirs[i]));
1251
1252         // reinitialize filesystem to detect the new paks
1253         FS_Rescan();
1254
1255         // exec the new config
1256         Host_LoadConfig_f();
1257
1258         // unload all sounds so they will be reloaded from the new files as needed
1259         S_UnloadAllSounds_f();
1260
1261         // reinitialize renderer (this reloads hud/console background/etc)
1262         R_Modules_Restart();
1263
1264         return true;
1265 }
1266
1267 /*
1268 ================
1269 FS_GameDir_f
1270 ================
1271 */
1272 void FS_GameDir_f (void)
1273 {
1274         int i;
1275         int numgamedirs;
1276         char gamedirs[MAX_GAMEDIRS][MAX_QPATH];
1277
1278         if (Cmd_Argc() < 2)
1279         {
1280                 Con_Printf("gamedirs active:");
1281                 for (i = 0;i < fs_numgamedirs;i++)
1282                         Con_Printf(" %s", fs_gamedirs[i]);
1283                 Con_Printf("\n");
1284                 return;
1285         }
1286
1287         numgamedirs = Cmd_Argc() - 1;
1288         if (numgamedirs > MAX_GAMEDIRS)
1289         {
1290                 Con_Printf("Too many gamedirs (%i > %i)\n", numgamedirs, MAX_GAMEDIRS);
1291                 return;
1292         }
1293
1294         for (i = 0;i < numgamedirs;i++)
1295                 strlcpy(gamedirs[i], Cmd_Argv(i+1), sizeof(gamedirs[i]));
1296
1297         if ((cls.state == ca_connected && !cls.demoplayback) || sv.active)
1298         {
1299                 // actually, changing during game would work fine, but would be stupid
1300                 Con_Printf("Can not change gamedir while client is connected or server is running!\n");
1301                 return;
1302         }
1303
1304         // halt demo playback to close the file
1305         CL_Disconnect();
1306
1307         FS_ChangeGameDirs(numgamedirs, gamedirs, true, true);
1308 }
1309
1310
1311 /*
1312 ================
1313 FS_CheckGameDir
1314 ================
1315 */
1316 qboolean FS_CheckGameDir(const char *gamedir)
1317 {
1318         qboolean success;
1319         stringlist_t list;
1320         stringlistinit(&list);
1321         listdirectory(&list, va("%s%s/", fs_basedir, gamedir), "");
1322         success = list.numstrings > 0;
1323         stringlistfreecontents(&list);
1324         return success;
1325 }
1326
1327
1328 /*
1329 ================
1330 FS_Init
1331 ================
1332 */
1333 void FS_Init (void)
1334 {
1335         int i;
1336
1337         fs_mempool = Mem_AllocPool("file management", 0, NULL);
1338
1339         strlcpy(fs_gamedir, "", sizeof(fs_gamedir));
1340
1341 // If the base directory is explicitly defined by the compilation process
1342 #ifdef DP_FS_BASEDIR
1343         strlcpy(fs_basedir, DP_FS_BASEDIR, sizeof(fs_basedir));
1344 #else
1345         strlcpy(fs_basedir, "", sizeof(fs_basedir));
1346
1347 #ifdef MACOSX
1348         // FIXME: is there a better way to find the directory outside the .app?
1349         if (strstr(com_argv[0], ".app/"))
1350         {
1351                 char *split;
1352
1353                 split = strstr(com_argv[0], ".app/");
1354                 while (split > com_argv[0] && *split != '/')
1355                         split--;
1356                 strlcpy(fs_basedir, com_argv[0], sizeof(fs_basedir));
1357                 fs_basedir[split - com_argv[0]] = 0;
1358         }
1359 #endif
1360 #endif
1361
1362         PK3_OpenLibrary ();
1363
1364         // -basedir <path>
1365         // Overrides the system supplied base directory (under GAMENAME)
1366 // 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)
1367         i = COM_CheckParm ("-basedir");
1368         if (i && i < com_argc-1)
1369         {
1370                 strlcpy (fs_basedir, com_argv[i+1], sizeof (fs_basedir));
1371                 i = (int)strlen (fs_basedir);
1372                 if (i > 0 && (fs_basedir[i-1] == '\\' || fs_basedir[i-1] == '/'))
1373                         fs_basedir[i-1] = 0;
1374         }
1375
1376         // add a path separator to the end of the basedir if it lacks one
1377         if (fs_basedir[0] && fs_basedir[strlen(fs_basedir) - 1] != '/' && fs_basedir[strlen(fs_basedir) - 1] != '\\')
1378                 strlcat(fs_basedir, "/", sizeof(fs_basedir));
1379
1380         if (!FS_CheckGameDir(gamedirname1))
1381                 Con_Printf("WARNING: base gamedir %s%s/ not found!\n", fs_basedir, gamedirname1);
1382
1383         if (gamedirname2 && !FS_CheckGameDir(gamedirname2))
1384                 Con_Printf("WARNING: base gamedir %s%s/ not found!\n", fs_basedir, gamedirname2);
1385
1386         // -game <gamedir>
1387         // Adds basedir/gamedir as an override game
1388         // LordHavoc: now supports multiple -game directories
1389         for (i = 1;i < com_argc && fs_numgamedirs < MAX_GAMEDIRS;i++)
1390         {
1391                 if (!com_argv[i])
1392                         continue;
1393                 if (!strcmp (com_argv[i], "-game") && i < com_argc-1)
1394                 {
1395                         i++;
1396                         if (FS_CheckNastyPath(com_argv[i], true))
1397                                 Sys_Error("-game %s%s/ is a dangerous/non-portable path\n", fs_basedir, com_argv[i]);
1398                         if (!FS_CheckGameDir(com_argv[i]))
1399                                 Con_Printf("WARNING: -game %s%s/ not found!\n", fs_basedir, com_argv[i]);
1400                         // add the gamedir to the list of active gamedirs
1401                         strlcpy (fs_gamedirs[fs_numgamedirs], com_argv[i], sizeof(fs_gamedirs[fs_numgamedirs]));
1402                         fs_numgamedirs++;
1403                 }
1404         }
1405
1406         // generate the searchpath
1407         FS_Rescan();
1408 }
1409
1410 void FS_Init_Commands(void)
1411 {
1412         Cvar_RegisterVariable (&scr_screenshot_name);
1413         Cvar_RegisterVariable (&fs_empty_files_in_pack_mark_deletions);
1414
1415         Cmd_AddCommand ("gamedir", FS_GameDir_f, "changes active gamedir list (can take multiple arguments), not including base directory (example usage: gamedir ctf)");
1416         Cmd_AddCommand ("fs_rescan", FS_Rescan_f, "rescans filesystem for new pack archives and any other changes");
1417         Cmd_AddCommand ("path", FS_Path_f, "print searchpath (game directories and archives)");
1418         Cmd_AddCommand ("dir", FS_Dir_f, "list files in searchpath matching an * filename pattern, one per line");
1419         Cmd_AddCommand ("ls", FS_Ls_f, "list files in searchpath matching an * filename pattern, multiple per line");
1420 }
1421
1422 /*
1423 ================
1424 FS_Shutdown
1425 ================
1426 */
1427 void FS_Shutdown (void)
1428 {
1429         // close all pack files and such
1430         // (hopefully there aren't any other open files, but they'll be cleaned up
1431         //  by the OS anyway)
1432         FS_ClearSearchPath();
1433         Mem_FreePool (&fs_mempool);
1434 }
1435
1436 /*
1437 ====================
1438 FS_SysOpen
1439
1440 Internal function used to create a qfile_t and open the relevant non-packed file on disk
1441 ====================
1442 */
1443 static qfile_t* FS_SysOpen (const char* filepath, const char* mode, qboolean nonblocking)
1444 {
1445         qfile_t* file;
1446         int mod, opt;
1447         unsigned int ind;
1448
1449         // Parse the mode string
1450         switch (mode[0])
1451         {
1452                 case 'r':
1453                         mod = O_RDONLY;
1454                         opt = 0;
1455                         break;
1456                 case 'w':
1457                         mod = O_WRONLY;
1458                         opt = O_CREAT | O_TRUNC;
1459                         break;
1460                 case 'a':
1461                         mod = O_WRONLY;
1462                         opt = O_CREAT | O_APPEND;
1463                         break;
1464                 default:
1465                         Con_Printf ("FS_SysOpen(%s, %s): invalid mode\n", filepath, mode);
1466                         return NULL;
1467         }
1468         for (ind = 1; mode[ind] != '\0'; ind++)
1469         {
1470                 switch (mode[ind])
1471                 {
1472                         case '+':
1473                                 mod = O_RDWR;
1474                                 break;
1475                         case 'b':
1476                                 opt |= O_BINARY;
1477                                 break;
1478                         default:
1479                                 Con_Printf ("FS_SysOpen(%s, %s): unknown character in mode (%c)\n",
1480                                                         filepath, mode, mode[ind]);
1481                 }
1482         }
1483
1484         if (nonblocking)
1485                 opt |= O_NONBLOCK;
1486
1487         file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
1488         memset (file, 0, sizeof (*file));
1489         file->ungetc = EOF;
1490
1491         file->handle = open (filepath, mod | opt, 0666);
1492         if (file->handle < 0)
1493         {
1494                 Mem_Free (file);
1495                 return NULL;
1496         }
1497
1498         file->real_length = lseek (file->handle, 0, SEEK_END);
1499
1500         // For files opened in append mode, we start at the end of the file
1501         if (mod & O_APPEND)
1502                 file->position = file->real_length;
1503         else
1504                 lseek (file->handle, 0, SEEK_SET);
1505
1506         return file;
1507 }
1508
1509
1510 /*
1511 ===========
1512 FS_OpenPackedFile
1513
1514 Open a packed file using its package file descriptor
1515 ===========
1516 */
1517 qfile_t *FS_OpenPackedFile (pack_t* pack, int pack_ind)
1518 {
1519         packfile_t *pfile;
1520         int dup_handle;
1521         qfile_t* file;
1522
1523         pfile = &pack->files[pack_ind];
1524
1525         // If we don't have the true offset, get it now
1526         if (! (pfile->flags & PACKFILE_FLAG_TRUEOFFS))
1527                 if (!PK3_GetTrueFileOffset (pfile, pack))
1528                         return NULL;
1529
1530         // No Zlib DLL = no compressed files
1531         if (!zlib_dll && (pfile->flags & PACKFILE_FLAG_DEFLATED))
1532         {
1533                 Con_Printf("WARNING: can't open the compressed file %s\n"
1534                                         "You need the Zlib DLL to use compressed files\n",
1535                                         pfile->name);
1536                 return NULL;
1537         }
1538
1539         // LordHavoc: lseek affects all duplicates of a handle so we do it before
1540         // the dup() call to avoid having to close the dup_handle on error here
1541         if (lseek (pack->handle, pfile->offset, SEEK_SET) == -1)
1542         {
1543                 Con_Printf ("FS_OpenPackedFile: can't lseek to %s in %s (offset: %d)\n",
1544                                         pfile->name, pack->filename, (int) pfile->offset);
1545                 return NULL;
1546         }
1547
1548         dup_handle = dup (pack->handle);
1549         if (dup_handle < 0)
1550         {
1551                 Con_Printf ("FS_OpenPackedFile: can't dup package's handle (pack: %s)\n", pack->filename);
1552                 return NULL;
1553         }
1554
1555         file = (qfile_t *)Mem_Alloc (fs_mempool, sizeof (*file));
1556         memset (file, 0, sizeof (*file));
1557         file->handle = dup_handle;
1558         file->flags = QFILE_FLAG_PACKED;
1559         file->real_length = pfile->realsize;
1560         file->offset = pfile->offset;
1561         file->position = 0;
1562         file->ungetc = EOF;
1563
1564         if (pfile->flags & PACKFILE_FLAG_DEFLATED)
1565         {
1566                 ztoolkit_t *ztk;
1567
1568                 file->flags |= QFILE_FLAG_DEFLATED;
1569
1570                 // We need some more variables
1571                 ztk = (ztoolkit_t *)Mem_Alloc (fs_mempool, sizeof (*ztk));
1572
1573                 ztk->comp_length = pfile->packsize;
1574
1575                 // Initialize zlib stream
1576                 ztk->zstream.next_in = ztk->input;
1577                 ztk->zstream.avail_in = 0;
1578
1579                 /* From Zlib's "unzip.c":
1580                  *
1581                  * windowBits is passed < 0 to tell that there is no zlib header.
1582                  * Note that in this case inflate *requires* an extra "dummy" byte
1583                  * after the compressed stream in order to complete decompression and
1584                  * return Z_STREAM_END.
1585                  * In unzip, i don't wait absolutely Z_STREAM_END because I known the
1586                  * size of both compressed and uncompressed data
1587                  */
1588                 if (qz_inflateInit2 (&ztk->zstream, -MAX_WBITS) != Z_OK)
1589                 {
1590                         Con_Printf ("FS_OpenPackedFile: inflate init error (file: %s)\n", pfile->name);
1591                         close(dup_handle);
1592                         Mem_Free(file);
1593                         return NULL;
1594                 }
1595
1596                 ztk->zstream.next_out = file->buff;
1597                 ztk->zstream.avail_out = sizeof (file->buff);
1598
1599                 file->ztk = ztk;
1600         }
1601
1602         return file;
1603 }
1604
1605 /*
1606 ====================
1607 FS_CheckNastyPath
1608
1609 Return true if the path should be rejected due to one of the following:
1610 1: path elements that are non-portable
1611 2: path elements that would allow access to files outside the game directory,
1612    or are just not a good idea for a mod to be using.
1613 ====================
1614 */
1615 int FS_CheckNastyPath (const char *path, qboolean isgamedir)
1616 {
1617         // all: never allow an empty path, as for gamedir it would access the parent directory and a non-gamedir path it is just useless
1618         if (!path[0])
1619                 return 2;
1620
1621         // Windows: don't allow \ in filenames (windows-only), period.
1622         // (on Windows \ is a directory separator, but / is also supported)
1623         if (strstr(path, "\\"))
1624                 return 1; // non-portable
1625
1626         // Mac: don't allow Mac-only filenames - : is a directory separator
1627         // instead of /, but we rely on / working already, so there's no reason to
1628         // support a Mac-only path
1629         // Amiga and Windows: : tries to go to root of drive
1630         if (strstr(path, ":"))
1631                 return 1; // non-portable attempt to go to root of drive
1632
1633         // Amiga: // is parent directory
1634         if (strstr(path, "//"))
1635                 return 1; // non-portable attempt to go to parent directory
1636
1637         // all: don't allow going to parent directory (../ or /../)
1638         if (strstr(path, ".."))
1639                 return 2; // attempt to go outside the game directory
1640
1641         // Windows and UNIXes: don't allow absolute paths
1642         if (path[0] == '/')
1643                 return 2; // attempt to go outside the game directory
1644
1645         // 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
1646         if (strchr(path, '.'))
1647         {
1648                 if (isgamedir)
1649                 {
1650                         // gamedir is entirely path elements, so simply forbid . entirely
1651                         return 2;
1652                 }
1653                 if (strchr(path, '.') < strrchr(path, '/'))
1654                         return 2; // possible attempt to go outside the game directory
1655         }
1656
1657         // all: forbid trailing slash on gamedir
1658         if (isgamedir && path[strlen(path)-1] == '/')
1659                 return 2;
1660
1661         // all: forbid leading dot on any filename for any reason
1662         if (strstr(path, "/."))
1663                 return 2; // attempt to go outside the game directory
1664
1665         // after all these checks we're pretty sure it's a / separated filename
1666         // and won't do much if any harm
1667         return false;
1668 }
1669
1670
1671 /*
1672 ====================
1673 FS_FindFile
1674
1675 Look for a file in the packages and in the filesystem
1676
1677 Return the searchpath where the file was found (or NULL)
1678 and the file index in the package if relevant
1679 ====================
1680 */
1681 static searchpath_t *FS_FindFile (const char *name, int* index, qboolean quiet)
1682 {
1683         searchpath_t *search;
1684         pack_t *pak;
1685
1686         // search through the path, one element at a time
1687         for (search = fs_searchpaths;search;search = search->next)
1688         {
1689                 // is the element a pak file?
1690                 if (search->pack)
1691                 {
1692                         int (*strcmp_funct) (const char* str1, const char* str2);
1693                         int left, right, middle;
1694
1695                         pak = search->pack;
1696                         strcmp_funct = pak->ignorecase ? strcasecmp : strcmp;
1697
1698                         // Look for the file (binary search)
1699                         left = 0;
1700                         right = pak->numfiles - 1;
1701                         while (left <= right)
1702                         {
1703                                 int diff;
1704
1705                                 middle = (left + right) / 2;
1706                                 diff = strcmp_funct (pak->files[middle].name, name);
1707
1708                                 // Found it
1709                                 if (!diff)
1710                                 {
1711                                         if (fs_empty_files_in_pack_mark_deletions.integer && pak->files[middle].realsize == 0)
1712                                         {
1713                                                 // yes, but the first one is empty so we treat it as not being there
1714                                                 if (!quiet && developer.integer >= 10)
1715                                                         Con_Printf("FS_FindFile: %s is marked as deleted\n", name);
1716
1717                                                 if (index != NULL)
1718                                                         *index = -1;
1719                                                 return NULL;
1720                                         }
1721
1722                                         if (!quiet && developer.integer >= 10)
1723                                                 Con_Printf("FS_FindFile: %s in %s\n",
1724                                                                         pak->files[middle].name, pak->filename);
1725
1726                                         if (index != NULL)
1727                                                 *index = middle;
1728                                         return search;
1729                                 }
1730
1731                                 // If we're too far in the list
1732                                 if (diff > 0)
1733                                         right = middle - 1;
1734                                 else
1735                                         left = middle + 1;
1736                         }
1737                 }
1738                 else
1739                 {
1740                         char netpath[MAX_OSPATH];
1741                         dpsnprintf(netpath, sizeof(netpath), "%s%s", search->filename, name);
1742                         if (FS_SysFileExists (netpath))
1743                         {
1744                                 if (!quiet && developer.integer >= 10)
1745                                         Con_Printf("FS_FindFile: %s\n", netpath);
1746
1747                                 if (index != NULL)
1748                                         *index = -1;
1749                                 return search;
1750                         }
1751                 }
1752         }
1753
1754         if (!quiet && developer.integer >= 10)
1755                 Con_Printf("FS_FindFile: can't find %s\n", name);
1756
1757         if (index != NULL)
1758                 *index = -1;
1759         return NULL;
1760 }
1761
1762
1763 /*
1764 ===========
1765 FS_OpenReadFile
1766
1767 Look for a file in the search paths and open it in read-only mode
1768 ===========
1769 */
1770 qfile_t *FS_OpenReadFile (const char *filename, qboolean quiet, qboolean nonblocking)
1771 {
1772         searchpath_t *search;
1773         int pack_ind;
1774
1775         search = FS_FindFile (filename, &pack_ind, quiet);
1776
1777         // Not found?
1778         if (search == NULL)
1779                 return NULL;
1780
1781         // Found in the filesystem?
1782         if (pack_ind < 0)
1783         {
1784                 char path [MAX_OSPATH];
1785                 dpsnprintf (path, sizeof (path), "%s%s", search->filename, filename);
1786                 return FS_SysOpen (path, "rb", nonblocking);
1787         }
1788
1789         // So, we found it in a package...
1790         return FS_OpenPackedFile (search->pack, pack_ind);
1791 }
1792
1793
1794 /*
1795 =============================================================================
1796
1797 MAIN PUBLIC FUNCTIONS
1798
1799 =============================================================================
1800 */
1801
1802 /*
1803 ====================
1804 FS_Open
1805
1806 Open a file. The syntax is the same as fopen
1807 ====================
1808 */
1809 qfile_t* FS_Open (const char* filepath, const char* mode, qboolean quiet, qboolean nonblocking)
1810 {
1811         if (FS_CheckNastyPath(filepath, false))
1812         {
1813                 Con_Printf("FS_Open(\"%s\", \"%s\", %s): nasty filename rejected\n", filepath, mode, quiet ? "true" : "false");
1814                 return NULL;
1815         }
1816
1817         // If the file is opened in "write", "append", or "read/write" mode
1818         if (mode[0] == 'w' || mode[0] == 'a' || strchr (mode, '+'))
1819         {
1820                 char real_path [MAX_OSPATH];
1821
1822                 // Open the file on disk directly
1823                 dpsnprintf (real_path, sizeof (real_path), "%s/%s", fs_gamedir, filepath);
1824
1825                 // Create directories up to the file
1826                 FS_CreatePath (real_path);
1827
1828                 return FS_SysOpen (real_path, mode, nonblocking);
1829         }
1830         // Else, we look at the various search paths and open the file in read-only mode
1831         else
1832                 return FS_OpenReadFile (filepath, quiet, nonblocking);
1833 }
1834
1835
1836 /*
1837 ====================
1838 FS_Close
1839
1840 Close a file
1841 ====================
1842 */
1843 int FS_Close (qfile_t* file)
1844 {
1845         if (close (file->handle))
1846                 return EOF;
1847
1848         if (file->ztk)
1849         {
1850                 qz_inflateEnd (&file->ztk->zstream);
1851                 Mem_Free (file->ztk);
1852         }
1853
1854         Mem_Free (file);
1855         return 0;
1856 }
1857
1858
1859 /*
1860 ====================
1861 FS_Write
1862
1863 Write "datasize" bytes into a file
1864 ====================
1865 */
1866 fs_offset_t FS_Write (qfile_t* file, const void* data, size_t datasize)
1867 {
1868         fs_offset_t result;
1869
1870         // If necessary, seek to the exact file position we're supposed to be
1871         if (file->buff_ind != file->buff_len)
1872                 lseek (file->handle, file->buff_ind - file->buff_len, SEEK_CUR);
1873
1874         // Purge cached data
1875         FS_Purge (file);
1876
1877         // Write the buffer and update the position
1878         result = write (file->handle, data, (fs_offset_t)datasize);
1879         file->position = lseek (file->handle, 0, SEEK_CUR);
1880         if (file->real_length < file->position)
1881                 file->real_length = file->position;
1882
1883         if (result < 0)
1884                 return 0;
1885
1886         return result;
1887 }
1888
1889
1890 /*
1891 ====================
1892 FS_Read
1893
1894 Read up to "buffersize" bytes from a file
1895 ====================
1896 */
1897 fs_offset_t FS_Read (qfile_t* file, void* buffer, size_t buffersize)
1898 {
1899         fs_offset_t count, done;
1900
1901         if (buffersize == 0)
1902                 return 0;
1903
1904         // Get rid of the ungetc character
1905         if (file->ungetc != EOF)
1906         {
1907                 ((char*)buffer)[0] = file->ungetc;
1908                 buffersize--;
1909                 file->ungetc = EOF;
1910                 done = 1;
1911         }
1912         else
1913                 done = 0;
1914
1915         // First, we copy as many bytes as we can from "buff"
1916         if (file->buff_ind < file->buff_len)
1917         {
1918                 count = file->buff_len - file->buff_ind;
1919                 count = ((fs_offset_t)buffersize > count) ? count : (fs_offset_t)buffersize;
1920                 done += count;
1921                 memcpy (buffer, &file->buff[file->buff_ind], count);
1922                 file->buff_ind += count;
1923
1924                 buffersize -= count;
1925                 if (buffersize == 0)
1926                         return done;
1927         }
1928
1929         // NOTE: at this point, the read buffer is always empty
1930
1931         // If the file isn't compressed
1932         if (! (file->flags & QFILE_FLAG_DEFLATED))
1933         {
1934                 fs_offset_t nb;
1935
1936                 // We must take care to not read after the end of the file
1937                 count = file->real_length - file->position;
1938
1939                 // If we have a lot of data to get, put them directly into "buffer"
1940                 if (buffersize > sizeof (file->buff) / 2)
1941                 {
1942                         if (count > (fs_offset_t)buffersize)
1943                                 count = (fs_offset_t)buffersize;
1944                         lseek (file->handle, file->offset + file->position, SEEK_SET);
1945                         nb = read (file->handle, &((unsigned char*)buffer)[done], count);
1946                         if (nb > 0)
1947                         {
1948                                 done += nb;
1949                                 file->position += nb;
1950
1951                                 // Purge cached data
1952                                 FS_Purge (file);
1953                         }
1954                 }
1955                 else
1956                 {
1957                         if (count > (fs_offset_t)sizeof (file->buff))
1958                                 count = (fs_offset_t)sizeof (file->buff);
1959                         lseek (file->handle, file->offset + file->position, SEEK_SET);
1960                         nb = read (file->handle, file->buff, count);
1961                         if (nb > 0)
1962                         {
1963                                 file->buff_len = nb;
1964                                 file->position += nb;
1965
1966                                 // Copy the requested data in "buffer" (as much as we can)
1967                                 count = (fs_offset_t)buffersize > file->buff_len ? file->buff_len : (fs_offset_t)buffersize;
1968                                 memcpy (&((unsigned char*)buffer)[done], file->buff, count);
1969                                 file->buff_ind = count;
1970                                 done += count;
1971                         }
1972                 }
1973
1974                 return done;
1975         }
1976
1977         // If the file is compressed, it's more complicated...
1978         // We cycle through a few operations until we have read enough data
1979         while (buffersize > 0)
1980         {
1981                 ztoolkit_t *ztk = file->ztk;
1982                 int error;
1983
1984                 // NOTE: at this point, the read buffer is always empty
1985
1986                 // If "input" is also empty, we need to refill it
1987                 if (ztk->in_ind == ztk->in_len)
1988                 {
1989                         // If we are at the end of the file
1990                         if (file->position == file->real_length)
1991                                 return done;
1992
1993                         count = (fs_offset_t)(ztk->comp_length - ztk->in_position);
1994                         if (count > (fs_offset_t)sizeof (ztk->input))
1995                                 count = (fs_offset_t)sizeof (ztk->input);
1996                         lseek (file->handle, file->offset + (fs_offset_t)ztk->in_position, SEEK_SET);
1997                         if (read (file->handle, ztk->input, count) != count)
1998                         {
1999                                 Con_Printf ("FS_Read: unexpected end of file\n");
2000                                 break;
2001                         }
2002
2003                         ztk->in_ind = 0;
2004                         ztk->in_len = count;
2005                         ztk->in_position += count;
2006                 }
2007
2008                 ztk->zstream.next_in = &ztk->input[ztk->in_ind];
2009                 ztk->zstream.avail_in = (unsigned int)(ztk->in_len - ztk->in_ind);
2010
2011                 // Now that we are sure we have compressed data available, we need to determine
2012                 // if it's better to inflate it in "file->buff" or directly in "buffer"
2013
2014                 // Inflate the data in "file->buff"
2015                 if (buffersize < sizeof (file->buff) / 2)
2016                 {
2017                         ztk->zstream.next_out = file->buff;
2018                         ztk->zstream.avail_out = sizeof (file->buff);
2019                         error = qz_inflate (&ztk->zstream, Z_SYNC_FLUSH);
2020                         if (error != Z_OK && error != Z_STREAM_END)
2021                         {
2022                                 Con_Printf ("FS_Read: Can't inflate file\n");
2023                                 break;
2024                         }
2025                         ztk->in_ind = ztk->in_len - ztk->zstream.avail_in;
2026
2027                         file->buff_len = (fs_offset_t)sizeof (file->buff) - ztk->zstream.avail_out;
2028                         file->position += file->buff_len;
2029
2030                         // Copy the requested data in "buffer" (as much as we can)
2031                         count = (fs_offset_t)buffersize > file->buff_len ? file->buff_len : (fs_offset_t)buffersize;
2032                         memcpy (&((unsigned char*)buffer)[done], file->buff, count);
2033                         file->buff_ind = count;
2034                 }
2035
2036                 // Else, we inflate directly in "buffer"
2037                 else
2038                 {
2039                         ztk->zstream.next_out = &((unsigned char*)buffer)[done];
2040                         ztk->zstream.avail_out = (unsigned int)buffersize;
2041                         error = qz_inflate (&ztk->zstream, Z_SYNC_FLUSH);
2042                         if (error != Z_OK && error != Z_STREAM_END)
2043                         {
2044                                 Con_Printf ("FS_Read: Can't inflate file\n");
2045                                 break;
2046                         }
2047                         ztk->in_ind = ztk->in_len - ztk->zstream.avail_in;
2048
2049                         // How much data did it inflate?
2050                         count = (fs_offset_t)(buffersize - ztk->zstream.avail_out);
2051                         file->position += count;
2052
2053                         // Purge cached data
2054                         FS_Purge (file);
2055                 }
2056
2057                 done += count;
2058                 buffersize -= count;
2059         }
2060
2061         return done;
2062 }
2063
2064
2065 /*
2066 ====================
2067 FS_Print
2068
2069 Print a string into a file
2070 ====================
2071 */
2072 int FS_Print (qfile_t* file, const char *msg)
2073 {
2074         return (int)FS_Write (file, msg, strlen (msg));
2075 }
2076
2077 /*
2078 ====================
2079 FS_Printf
2080
2081 Print a string into a file
2082 ====================
2083 */
2084 int FS_Printf(qfile_t* file, const char* format, ...)
2085 {
2086         int result;
2087         va_list args;
2088
2089         va_start (args, format);
2090         result = FS_VPrintf (file, format, args);
2091         va_end (args);
2092
2093         return result;
2094 }
2095
2096
2097 /*
2098 ====================
2099 FS_VPrintf
2100
2101 Print a string into a file
2102 ====================
2103 */
2104 int FS_VPrintf (qfile_t* file, const char* format, va_list ap)
2105 {
2106         int len;
2107         fs_offset_t buff_size = MAX_INPUTLINE;
2108         char *tempbuff;
2109
2110         for (;;)
2111         {
2112                 tempbuff = (char *)Mem_Alloc (tempmempool, buff_size);
2113                 len = dpvsnprintf (tempbuff, buff_size, format, ap);
2114                 if (len >= 0 && len < buff_size)
2115                         break;
2116                 Mem_Free (tempbuff);
2117                 buff_size *= 2;
2118         }
2119
2120         len = write (file->handle, tempbuff, len);
2121         Mem_Free (tempbuff);
2122
2123         return len;
2124 }
2125
2126
2127 /*
2128 ====================
2129 FS_Getc
2130
2131 Get the next character of a file
2132 ====================
2133 */
2134 int FS_Getc (qfile_t* file)
2135 {
2136         unsigned char c;
2137
2138         if (FS_Read (file, &c, 1) != 1)
2139                 return EOF;
2140
2141         return c;
2142 }
2143
2144
2145 /*
2146 ====================
2147 FS_UnGetc
2148
2149 Put a character back into the read buffer (only supports one character!)
2150 ====================
2151 */
2152 int FS_UnGetc (qfile_t* file, unsigned char c)
2153 {
2154         // If there's already a character waiting to be read
2155         if (file->ungetc != EOF)
2156                 return EOF;
2157
2158         file->ungetc = c;
2159         return c;
2160 }
2161
2162
2163 /*
2164 ====================
2165 FS_Seek
2166
2167 Move the position index in a file
2168 ====================
2169 */
2170 int FS_Seek (qfile_t* file, fs_offset_t offset, int whence)
2171 {
2172         ztoolkit_t *ztk;
2173         unsigned char* buffer;
2174         fs_offset_t buffersize;
2175
2176         // Compute the file offset
2177         switch (whence)
2178         {
2179                 case SEEK_CUR:
2180                         offset += file->position - file->buff_len + file->buff_ind;
2181                         break;
2182
2183                 case SEEK_SET:
2184                         break;
2185
2186                 case SEEK_END:
2187                         offset += file->real_length;
2188                         break;
2189
2190                 default:
2191                         return -1;
2192         }
2193         if (offset < 0 || offset > file->real_length)
2194                 return -1;
2195
2196         // If we have the data in our read buffer, we don't need to actually seek
2197         if (file->position - file->buff_len <= offset && offset <= file->position)
2198         {
2199                 file->buff_ind = offset + file->buff_len - file->position;
2200                 return 0;
2201         }
2202
2203         // Purge cached data
2204         FS_Purge (file);
2205
2206         // Unpacked or uncompressed files can seek directly
2207         if (! (file->flags & QFILE_FLAG_DEFLATED))
2208         {
2209                 if (lseek (file->handle, file->offset + offset, SEEK_SET) == -1)
2210                         return -1;
2211                 file->position = offset;
2212                 return 0;
2213         }
2214
2215         // Seeking in compressed files is more a hack than anything else,
2216         // but we need to support it, so here we go.
2217         ztk = file->ztk;
2218
2219         // If we have to go back in the file, we need to restart from the beginning
2220         if (offset <= file->position)
2221         {
2222                 ztk->in_ind = 0;
2223                 ztk->in_len = 0;
2224                 ztk->in_position = 0;
2225                 file->position = 0;
2226                 lseek (file->handle, file->offset, SEEK_SET);
2227
2228                 // Reset the Zlib stream
2229                 ztk->zstream.next_in = ztk->input;
2230                 ztk->zstream.avail_in = 0;
2231                 qz_inflateReset (&ztk->zstream);
2232         }
2233
2234         // We need a big buffer to force inflating into it directly
2235         buffersize = 2 * sizeof (file->buff);
2236         buffer = (unsigned char *)Mem_Alloc (tempmempool, buffersize);
2237
2238         // Skip all data until we reach the requested offset
2239         while (offset > file->position)
2240         {
2241                 fs_offset_t diff = offset - file->position;
2242                 fs_offset_t count, len;
2243
2244                 count = (diff > buffersize) ? buffersize : diff;
2245                 len = FS_Read (file, buffer, count);
2246                 if (len != count)
2247                 {
2248                         Mem_Free (buffer);
2249                         return -1;
2250                 }
2251         }
2252
2253         Mem_Free (buffer);
2254         return 0;
2255 }
2256
2257
2258 /*
2259 ====================
2260 FS_Tell
2261
2262 Give the current position in a file
2263 ====================
2264 */
2265 fs_offset_t FS_Tell (qfile_t* file)
2266 {
2267         return file->position - file->buff_len + file->buff_ind;
2268 }
2269
2270
2271 /*
2272 ====================
2273 FS_FileSize
2274
2275 Give the total size of a file
2276 ====================
2277 */
2278 fs_offset_t FS_FileSize (qfile_t* file)
2279 {
2280         return file->real_length;
2281 }
2282
2283
2284 /*
2285 ====================
2286 FS_Purge
2287
2288 Erases any buffered input or output data
2289 ====================
2290 */
2291 void FS_Purge (qfile_t* file)
2292 {
2293         file->buff_len = 0;
2294         file->buff_ind = 0;
2295         file->ungetc = EOF;
2296 }
2297
2298
2299 /*
2300 ============
2301 FS_LoadFile
2302
2303 Filename are relative to the quake directory.
2304 Always appends a 0 byte.
2305 ============
2306 */
2307 unsigned char *FS_LoadFile (const char *path, mempool_t *pool, qboolean quiet, fs_offset_t *filesizepointer)
2308 {
2309         qfile_t *file;
2310         unsigned char *buf = NULL;
2311         fs_offset_t filesize = 0;
2312
2313         file = FS_Open (path, "rb", quiet, false);
2314         if (file)
2315         {
2316                 filesize = file->real_length;
2317                 buf = (unsigned char *)Mem_Alloc (pool, filesize + 1);
2318                 buf[filesize] = '\0';
2319                 FS_Read (file, buf, filesize);
2320                 FS_Close (file);
2321                 if (developer_loadfile.integer)
2322                         Con_Printf("loaded file \"%s\" (%u bytes)\n", path, (unsigned int)filesize);
2323         }
2324
2325         if (filesizepointer)
2326                 *filesizepointer = filesize;
2327         return buf;
2328 }
2329
2330
2331 /*
2332 ============
2333 FS_WriteFile
2334
2335 The filename will be prefixed by the current game directory
2336 ============
2337 */
2338 qboolean FS_WriteFile (const char *filename, void *data, fs_offset_t len)
2339 {
2340         qfile_t *file;
2341
2342         file = FS_Open (filename, "wb", false, false);
2343         if (!file)
2344         {
2345                 Con_Printf("FS_WriteFile: failed on %s\n", filename);
2346                 return false;
2347         }
2348
2349         Con_DPrintf("FS_WriteFile: %s (%u bytes)\n", filename, (unsigned int)len);
2350         FS_Write (file, data, len);
2351         FS_Close (file);
2352         return true;
2353 }
2354
2355
2356 /*
2357 =============================================================================
2358
2359 OTHERS PUBLIC FUNCTIONS
2360
2361 =============================================================================
2362 */
2363
2364 /*
2365 ============
2366 FS_StripExtension
2367 ============
2368 */
2369 void FS_StripExtension (const char *in, char *out, size_t size_out)
2370 {
2371         char *last = NULL;
2372         char currentchar;
2373
2374         if (size_out == 0)
2375                 return;
2376
2377         while ((currentchar = *in) && size_out > 1)
2378         {
2379                 if (currentchar == '.')
2380                         last = out;
2381                 else if (currentchar == '/' || currentchar == '\\' || currentchar == ':')
2382                         last = NULL;
2383                 *out++ = currentchar;
2384                 in++;
2385                 size_out--;
2386         }
2387         if (last)
2388                 *last = 0;
2389         else
2390                 *out = 0;
2391 }
2392
2393
2394 /*
2395 ==================
2396 FS_DefaultExtension
2397 ==================
2398 */
2399 void FS_DefaultExtension (char *path, const char *extension, size_t size_path)
2400 {
2401         const char *src;
2402
2403         // if path doesn't have a .EXT, append extension
2404         // (extension should include the .)
2405         src = path + strlen(path) - 1;
2406
2407         while (*src != '/' && src != path)
2408         {
2409                 if (*src == '.')
2410                         return;                 // it has an extension
2411                 src--;
2412         }
2413
2414         strlcat (path, extension, size_path);
2415 }
2416
2417
2418 /*
2419 ==================
2420 FS_FileType
2421
2422 Look for a file in the packages and in the filesystem
2423 ==================
2424 */
2425 int FS_FileType (const char *filename)
2426 {
2427         searchpath_t *search;
2428         char fullpath[MAX_QPATH];
2429
2430         search = FS_FindFile (filename, NULL, true);
2431         if(!search)
2432                 return FS_FILETYPE_NONE;
2433
2434         if(search->pack)
2435                 return FS_FILETYPE_FILE; // TODO can't check directories in paks yet, maybe later
2436
2437         dpsnprintf(fullpath, sizeof(fullpath), "%s%s", search->filename, filename);
2438         return FS_SysFileType(fullpath);
2439 }
2440
2441
2442 /*
2443 ==================
2444 FS_FileExists
2445
2446 Look for a file in the packages and in the filesystem
2447 ==================
2448 */
2449 qboolean FS_FileExists (const char *filename)
2450 {
2451         return (FS_FindFile (filename, NULL, true) != NULL);
2452 }
2453
2454
2455 /*
2456 ==================
2457 FS_SysFileExists
2458
2459 Look for a file in the filesystem only
2460 ==================
2461 */
2462 int FS_SysFileType (const char *path)
2463 {
2464 #if WIN32
2465         DWORD result = GetFileAttributes(path);
2466
2467         if(result == INVALID_FILE_ATTRIBUTES)
2468                 return FS_FILETYPE_NONE;
2469
2470         if(result & FILE_ATTRIBUTE_DIRECTORY)
2471                 return FS_FILETYPE_DIRECTORY;
2472
2473         return FS_FILETYPE_FILE;
2474 #else
2475         struct stat buf;
2476
2477         if (stat (path,&buf) == -1)
2478                 return FS_FILETYPE_NONE;
2479
2480         if(S_ISDIR(buf.st_mode))
2481                 return FS_FILETYPE_DIRECTORY;
2482
2483         return FS_FILETYPE_FILE;
2484 #endif
2485 }
2486
2487 qboolean FS_SysFileExists (const char *path)
2488 {
2489         return FS_SysFileType (path) != FS_FILETYPE_NONE;
2490 }
2491
2492 void FS_mkdir (const char *path)
2493 {
2494 #if WIN32
2495         _mkdir (path);
2496 #else
2497         mkdir (path, 0777);
2498 #endif
2499 }
2500
2501 /*
2502 ===========
2503 FS_Search
2504
2505 Allocate and fill a search structure with information on matching filenames.
2506 ===========
2507 */
2508 fssearch_t *FS_Search(const char *pattern, int caseinsensitive, int quiet)
2509 {
2510         fssearch_t *search;
2511         searchpath_t *searchpath;
2512         pack_t *pak;
2513         int i, basepathlength, numfiles, numchars, resultlistindex, dirlistindex;
2514         stringlist_t resultlist;
2515         stringlist_t dirlist;
2516         const char *slash, *backslash, *colon, *separator;
2517         char *basepath;
2518         char temp[MAX_OSPATH];
2519
2520         for (i = 0;pattern[i] == '.' || pattern[i] == ':' || pattern[i] == '/' || pattern[i] == '\\';i++)
2521                 ;
2522
2523         if (i > 0)
2524         {
2525                 Con_Printf("Don't use punctuation at the beginning of a search pattern!\n");
2526                 return NULL;
2527         }
2528
2529         stringlistinit(&resultlist);
2530         stringlistinit(&dirlist);
2531         search = NULL;
2532         slash = strrchr(pattern, '/');
2533         backslash = strrchr(pattern, '\\');
2534         colon = strrchr(pattern, ':');
2535         separator = max(slash, backslash);
2536         separator = max(separator, colon);
2537         basepathlength = separator ? (separator + 1 - pattern) : 0;
2538         basepath = (char *)Mem_Alloc (tempmempool, basepathlength + 1);
2539         if (basepathlength)
2540                 memcpy(basepath, pattern, basepathlength);
2541         basepath[basepathlength] = 0;
2542
2543         // search through the path, one element at a time
2544         for (searchpath = fs_searchpaths;searchpath;searchpath = searchpath->next)
2545         {
2546                 // is the element a pak file?
2547                 if (searchpath->pack)
2548                 {
2549                         // look through all the pak file elements
2550                         pak = searchpath->pack;
2551                         for (i = 0;i < pak->numfiles;i++)
2552                         {
2553                                 strlcpy(temp, pak->files[i].name, sizeof(temp));
2554                                 while (temp[0])
2555                                 {
2556                                         if (matchpattern(temp, (char *)pattern, true))
2557                                         {
2558                                                 for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
2559                                                         if (!strcmp(resultlist.strings[resultlistindex], temp))
2560                                                                 break;
2561                                                 if (resultlistindex == resultlist.numstrings)
2562                                                 {
2563                                                         stringlistappend(&resultlist, temp);
2564                                                         if (!quiet && developer_loading.integer)
2565                                                                 Con_Printf("SearchPackFile: %s : %s\n", pak->filename, temp);
2566                                                 }
2567                                         }
2568                                         // strip off one path element at a time until empty
2569                                         // this way directories are added to the listing if they match the pattern
2570                                         slash = strrchr(temp, '/');
2571                                         backslash = strrchr(temp, '\\');
2572                                         colon = strrchr(temp, ':');
2573                                         separator = temp;
2574                                         if (separator < slash)
2575                                                 separator = slash;
2576                                         if (separator < backslash)
2577                                                 separator = backslash;
2578                                         if (separator < colon)
2579                                                 separator = colon;
2580                                         *((char *)separator) = 0;
2581                                 }
2582                         }
2583                 }
2584                 else
2585                 {
2586                         stringlist_t matchedSet, foundSet;
2587                         const char *start = pattern;
2588
2589                         stringlistinit(&matchedSet);
2590                         stringlistinit(&foundSet);
2591                         // add a first entry to the set
2592                         stringlistappend(&matchedSet, "");
2593                         // iterate through pattern's path
2594                         while (*start)
2595                         {
2596                                 const char *asterisk, *wildcard, *nextseparator, *prevseparator;
2597                                 char subpath[MAX_OSPATH];
2598                                 char subpattern[MAX_OSPATH];
2599
2600                                 // find the next wildcard
2601                                 wildcard = strchr(start, '?');
2602                                 asterisk = strchr(start, '*');
2603                                 if (asterisk && (!wildcard || asterisk < wildcard))
2604                                 {
2605                                         wildcard = asterisk;
2606                                 }
2607
2608                                 if (wildcard)
2609                                 {
2610                                         nextseparator = strchr( wildcard, '/' );
2611                                 }
2612                                 else
2613                                 {
2614                                         nextseparator = NULL;
2615                                 }
2616
2617                                 if( !nextseparator ) {
2618                                         nextseparator = start + strlen( start );
2619                                 }
2620
2621                                 // prevseparator points past the '/' right before the wildcard and nextseparator at the one following it (or at the end of the string)
2622                                 // copy everything up except nextseperator
2623                                 strlcpy(subpattern, pattern, min(sizeof(subpattern), (size_t) (nextseparator - pattern + 1)));
2624                                 // find the last '/' before the wildcard
2625                                 prevseparator = strrchr( subpattern, '/' );
2626                                 if (!prevseparator)
2627                                         prevseparator = subpattern;
2628                                 else
2629                                         prevseparator++;
2630                                 // copy everything from start to the previous including the '/' (before the wildcard)
2631                                 // everything up to start is already included in the path of matchedSet's entries
2632                                 strlcpy(subpath, start, min(sizeof(subpath), (size_t) ((prevseparator - subpattern) - (start - pattern) + 1)));
2633
2634                                 // for each entry in matchedSet try to open the subdirectories specified in subpath
2635                                 for( dirlistindex = 0 ; dirlistindex < matchedSet.numstrings ; dirlistindex++ ) {
2636                                         strlcpy( temp, matchedSet.strings[ dirlistindex ], sizeof(temp) );
2637                                         strlcat( temp, subpath, sizeof(temp) );
2638                                         listdirectory( &foundSet, searchpath->filename, temp );
2639                                 }
2640                                 if( dirlistindex == 0 ) {
2641                                         break;
2642                                 }
2643                                 // reset the current result set
2644                                 stringlistfreecontents( &matchedSet );
2645                                 // match against the pattern
2646                                 for( dirlistindex = 0 ; dirlistindex < foundSet.numstrings ; dirlistindex++ ) {
2647                                         const char *direntry = foundSet.strings[ dirlistindex ];
2648                                         if (matchpattern(direntry, subpattern, true)) {
2649                                                 stringlistappend( &matchedSet, direntry );
2650                                         }
2651                                 }
2652                                 stringlistfreecontents( &foundSet );
2653
2654                                 start = nextseparator;
2655                         }
2656
2657                         for (dirlistindex = 0;dirlistindex < matchedSet.numstrings;dirlistindex++)
2658                         {
2659                                 const char *temp = matchedSet.strings[dirlistindex];
2660                                 if (matchpattern(temp, (char *)pattern, true))
2661                                 {
2662                                         for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
2663                                                 if (!strcmp(resultlist.strings[resultlistindex], temp))
2664                                                         break;
2665                                         if (resultlistindex == resultlist.numstrings)
2666                                         {
2667                                                 stringlistappend(&resultlist, temp);
2668                                                 if (!quiet && developer_loading.integer)
2669                                                         Con_Printf("SearchDirFile: %s\n", temp);
2670                                         }
2671                                 }
2672                         }
2673                         stringlistfreecontents( &matchedSet );
2674                 }
2675         }
2676
2677         if (resultlist.numstrings)
2678         {
2679                 stringlistsort(&resultlist);
2680                 numfiles = resultlist.numstrings;
2681                 numchars = 0;
2682                 for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
2683                         numchars += (int)strlen(resultlist.strings[resultlistindex]) + 1;
2684                 search = (fssearch_t *)Z_Malloc(sizeof(fssearch_t) + numchars + numfiles * sizeof(char *));
2685                 search->filenames = (char **)((char *)search + sizeof(fssearch_t));
2686                 search->filenamesbuffer = (char *)((char *)search + sizeof(fssearch_t) + numfiles * sizeof(char *));
2687                 search->numfilenames = (int)numfiles;
2688                 numfiles = 0;
2689                 numchars = 0;
2690                 for (resultlistindex = 0;resultlistindex < resultlist.numstrings;resultlistindex++)
2691                 {
2692                         size_t textlen;
2693                         search->filenames[numfiles] = search->filenamesbuffer + numchars;
2694                         textlen = strlen(resultlist.strings[resultlistindex]) + 1;
2695                         memcpy(search->filenames[numfiles], resultlist.strings[resultlistindex], textlen);
2696                         numfiles++;
2697                         numchars += (int)textlen;
2698                 }
2699         }
2700         stringlistfreecontents(&resultlist);
2701
2702         Mem_Free(basepath);
2703         return search;
2704 }
2705
2706 void FS_FreeSearch(fssearch_t *search)
2707 {
2708         Z_Free(search);
2709 }
2710
2711 extern int con_linewidth;
2712 int FS_ListDirectory(const char *pattern, int oneperline)
2713 {
2714         int numfiles;
2715         int numcolumns;
2716         int numlines;
2717         int columnwidth;
2718         int linebufpos;
2719         int i, j, k, l;
2720         const char *name;
2721         char linebuf[MAX_INPUTLINE];
2722         fssearch_t *search;
2723         search = FS_Search(pattern, true, true);
2724         if (!search)
2725                 return 0;
2726         numfiles = search->numfilenames;
2727         if (!oneperline)
2728         {
2729                 // FIXME: the names could be added to one column list and then
2730                 // gradually shifted into the next column if they fit, and then the
2731                 // next to make a compact variable width listing but it's a lot more
2732                 // complicated...
2733                 // find width for columns
2734                 columnwidth = 0;
2735                 for (i = 0;i < numfiles;i++)
2736                 {
2737                         l = (int)strlen(search->filenames[i]);
2738                         if (columnwidth < l)
2739                                 columnwidth = l;
2740                 }
2741                 // count the spacing character
2742                 columnwidth++;
2743                 // calculate number of columns
2744                 numcolumns = con_linewidth / columnwidth;
2745                 // don't bother with the column printing if it's only one column
2746                 if (numcolumns >= 2)
2747                 {
2748                         numlines = (numfiles + numcolumns - 1) / numcolumns;
2749                         for (i = 0;i < numlines;i++)
2750                         {
2751                                 linebufpos = 0;
2752                                 for (k = 0;k < numcolumns;k++)
2753                                 {
2754                                         l = i * numcolumns + k;
2755                                         if (l < numfiles)
2756                                         {
2757                                                 name = search->filenames[l];
2758                                                 for (j = 0;name[j] && linebufpos + 1 < (int)sizeof(linebuf);j++)
2759                                                         linebuf[linebufpos++] = name[j];
2760                                                 // space out name unless it's the last on the line
2761                                                 if (k + 1 < numcolumns && l + 1 < numfiles)
2762                                                         for (;j < columnwidth && linebufpos + 1 < (int)sizeof(linebuf);j++)
2763                                                                 linebuf[linebufpos++] = ' ';
2764                                         }
2765                                 }
2766                                 linebuf[linebufpos] = 0;
2767                                 Con_Printf("%s\n", linebuf);
2768                         }
2769                 }
2770                 else
2771                         oneperline = true;
2772         }
2773         if (oneperline)
2774                 for (i = 0;i < numfiles;i++)
2775                         Con_Printf("%s\n", search->filenames[i]);
2776         FS_FreeSearch(search);
2777         return (int)numfiles;
2778 }
2779
2780 static void FS_ListDirectoryCmd (const char* cmdname, int oneperline)
2781 {
2782         const char *pattern;
2783         if (Cmd_Argc() > 3)
2784         {
2785                 Con_Printf("usage:\n%s [path/pattern]\n", cmdname);
2786                 return;
2787         }
2788         if (Cmd_Argc() == 2)
2789                 pattern = Cmd_Argv(1);
2790         else
2791                 pattern = "*";
2792         if (!FS_ListDirectory(pattern, oneperline))
2793                 Con_Print("No files found.\n");
2794 }
2795
2796 void FS_Dir_f(void)
2797 {
2798         FS_ListDirectoryCmd("dir", true);
2799 }
2800
2801 void FS_Ls_f(void)
2802 {
2803         FS_ListDirectoryCmd("ls", false);
2804 }
2805
2806 const char *FS_WhichPack(const char *filename)
2807 {
2808         int index;
2809         searchpath_t *sp = FS_FindFile(filename, &index, true);
2810         if(sp && sp->pack)
2811                 return sp->pack->filename;
2812         else
2813                 return 0;
2814 }
2815
2816 /*
2817 ====================
2818 FS_IsRegisteredQuakePack
2819
2820 Look for a proof of purchase file file in the requested package
2821
2822 If it is found, this file should NOT be downloaded.
2823 ====================
2824 */
2825 qboolean FS_IsRegisteredQuakePack(const char *name)
2826 {
2827         searchpath_t *search;
2828         pack_t *pak;
2829
2830         // search through the path, one element at a time
2831         for (search = fs_searchpaths;search;search = search->next)
2832         {
2833                 if (search->pack && !strcasecmp(FS_FileWithoutPath(search->filename), name))
2834                 {
2835                         int (*strcmp_funct) (const char* str1, const char* str2);
2836                         int left, right, middle;
2837
2838                         pak = search->pack;
2839                         strcmp_funct = pak->ignorecase ? strcasecmp : strcmp;
2840
2841                         // Look for the file (binary search)
2842                         left = 0;
2843                         right = pak->numfiles - 1;
2844                         while (left <= right)
2845                         {
2846                                 int diff;
2847
2848                                 middle = (left + right) / 2;
2849                                 diff = !strcmp_funct (pak->files[middle].name, "gfx/pop.lmp");
2850
2851                                 // Found it
2852                                 if (!diff)
2853                                         return true;
2854
2855                                 // If we're too far in the list
2856                                 if (diff > 0)
2857                                         right = middle - 1;
2858                                 else
2859                                         left = middle + 1;
2860                         }
2861
2862                         // we found the requested pack but it is not registered quake
2863                         return false;
2864                 }
2865         }
2866
2867         return false;
2868 }
2869
2870 int FS_CRCFile(const char *filename, size_t *filesizepointer)
2871 {
2872         int crc = -1;
2873         unsigned char *filedata;
2874         fs_offset_t filesize;
2875         if (filesizepointer)
2876                 *filesizepointer = 0;
2877         if (!filename || !*filename)
2878                 return crc;
2879         filedata = FS_LoadFile(filename, tempmempool, true, &filesize);
2880         if (filedata)
2881         {
2882                 if (filesizepointer)
2883                         *filesizepointer = filesize;
2884                 crc = CRC_Block(filedata, filesize);
2885                 Mem_Free(filedata);
2886         }
2887         return crc;
2888 }
2889