gio/xdgmime/xdgmime.c

   1 /* -*- mode: C; c-file-style: "gnu" -*- */
   2 /* xdgmime.c: XDG Mime Spec mime resolver.  Based on version 0.11 of the spec.
   3  *
   4  * More info can be found at http://www.freedesktop.org/standards/
   5  *
   6  * Copyright (C) 2003,2004  Red Hat, Inc.
   7  * Copyright (C) 2003,2004  Jonathan Blandford <jrb@alum.mit.edu>
   8  *
   9  * Licensed under the Academic Free License version 2.0
  10  * Or under the following terms:
  11  *
  12  * This library is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU Lesser General Public
  14  * License as published by the Free Software Foundation; either
  15  * version 2.1 of the License, or (at your option) any later version.
  16  *
  17  * This library is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public
  23  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "xdgmime.h"
  31 #include "xdgmimeint.h"
  32 #include "xdgmimeglob.h"
  33 #include "xdgmimemagic.h"
  34 #include "xdgmimealias.h"
  35 #include "xdgmimeicon.h"
  36 #include "xdgmimeparent.h"
  37 #include "xdgmimecache.h"
  38 #include <stdio.h>
  39 #include <string.h>
  40 #include <sys/stat.h>
  41 #include <sys/types.h>
  42 #include <sys/time.h>
  43 #include <unistd.h>
  44 #include <assert.h>
  45
  46 typedef struct XdgDirTimeList XdgDirTimeList;
  47 typedef struct XdgCallbackList XdgCallbackList;
  48
  49 static int need_reread = TRUE;
  50 static time_t last_stat_time = 0;
  51
  52 static XdgGlobHash *global_hash = NULL;
  53 static XdgMimeMagic *global_magic = NULL;
  54 static XdgAliasList *alias_list = NULL;
  55 static XdgParentList *parent_list = NULL;
  56 static XdgDirTimeList *dir_time_list = NULL;
  57 static XdgCallbackList *callback_list = NULL;
  58 static XdgIconList *icon_list = NULL;
  59 static XdgIconList *generic_icon_list = NULL;
  60
  61 XdgMimeCache **_caches = NULL;
  62 static int n_caches = 0;
  63
  64 const char xdg_mime_type_unknown[] = "application/octet-stream";
  65
  66
  67 enum
  68 {
  69   XDG_CHECKED_UNCHECKED,
  70   XDG_CHECKED_VALID,
  71   XDG_CHECKED_INVALID
  72 };
  73
  74 struct XdgDirTimeList
  75 {
  76   time_t mtime;
  77   char *directory_name;
  78   int checked;
  79   XdgDirTimeList *next;
  80 };
  81
  82 struct XdgCallbackList
  83 {
  84   XdgCallbackList *next;
  85   XdgCallbackList *prev;
  86   int              callback_id;
  87   XdgMimeCallback  callback;
  88   void            *data;
  89   XdgMimeDestroy   destroy;
  90 };
  91
  92 /* Function called by xdg_run_command_on_dirs.  If it returns TRUE, further
  93  * directories aren't looked at */
  94 typedef int (*XdgDirectoryFunc) (const char *directory,
  95                                  void       *user_data);
  96
  97 static void
  98 xdg_dir_time_list_add (char   *file_name,
  99                        time_t  mtime)
 100 {
 101   XdgDirTimeList *list;
 102
 103   for (list = dir_time_list; list; list = list->next)
 104     {
 105       if (strcmp (list->directory_name, file_name) == 0)
 106         {
 107           free (file_name);
 108           return;
 109         }
 110     }
 111
 112   list = calloc (1, sizeof (XdgDirTimeList));
 113   list->checked = XDG_CHECKED_UNCHECKED;
 114   list->directory_name = file_name;
 115   list->mtime = mtime;
 116   list->next = dir_time_list;
 117   dir_time_list = list;
 118 }
 119
 120 static void
 121 xdg_dir_time_list_free (XdgDirTimeList *list)
 122 {
 123   XdgDirTimeList *next;
 124
 125   while (list)
 126     {
 127       next = list->next;
 128       free (list->directory_name);
 129       free (list);
 130       list = next;
 131     }
 132 }
 133
 134 static int
 135 xdg_mime_init_from_directory (const char *directory)
 136 {
 137   char *file_name;
 138   struct stat st;
 139
 140   assert (directory != NULL);
 141
 142   file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
 143   strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
 144   if (stat (file_name, &st) == 0)
 145     {
 146       XdgMimeCache *cache = _xdg_mime_cache_new_from_file (file_name);
 147
 148       if (cache != NULL)
 149         {
 150           xdg_dir_time_list_add (file_name, st.st_mtime);
 151
 152           _caches = realloc (_caches, sizeof (XdgMimeCache *) * (n_caches + 2));
 153           _caches[n_caches] = cache;
 154           _caches[n_caches + 1] = NULL;
 155           n_caches++;
 156
 157           return FALSE;
 158         }
 159     }
 160   free (file_name);
 161
 162   file_name = malloc (strlen (directory) + strlen ("/mime/globs2") + 1);
 163   strcpy (file_name, directory); strcat (file_name, "/mime/globs2");
 164   if (stat (file_name, &st) == 0)
 165     {
 166       _xdg_mime_glob_read_from_file (global_hash, file_name, TRUE);
 167       xdg_dir_time_list_add (file_name, st.st_mtime);
 168     }
 169   else
 170     {
 171       free (file_name);
 172       file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
 173       strcpy (file_name, directory); strcat (file_name, "/mime/globs");
 174       if (stat (file_name, &st) == 0)
 175         {
 176           _xdg_mime_glob_read_from_file (global_hash, file_name, FALSE);
 177           xdg_dir_time_list_add (file_name, st.st_mtime);
 178         }
 179       else
 180         {
 181           free (file_name);
 182         }
 183     }
 184
 185   file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
 186   strcpy (file_name, directory); strcat (file_name, "/mime/magic");
 187   if (stat (file_name, &st) == 0)
 188     {
 189       _xdg_mime_magic_read_from_file (global_magic, file_name);
 190       xdg_dir_time_list_add (file_name, st.st_mtime);
 191     }
 192   else
 193     {
 194       free (file_name);
 195     }
 196
 197   file_name = malloc (strlen (directory) + strlen ("/mime/aliases") + 1);
 198   strcpy (file_name, directory); strcat (file_name, "/mime/aliases");
 199   _xdg_mime_alias_read_from_file (alias_list, file_name);
 200   free (file_name);
 201
 202   file_name = malloc (strlen (directory) + strlen ("/mime/subclasses") + 1);
 203   strcpy (file_name, directory); strcat (file_name, "/mime/subclasses");
 204   _xdg_mime_parent_read_from_file (parent_list, file_name);
 205   free (file_name);
 206
 207   file_name = malloc (strlen (directory) + strlen ("/mime/icons") + 1);
 208   strcpy (file_name, directory); strcat (file_name, "/mime/icons");
 209   _xdg_mime_icon_read_from_file (icon_list, file_name);
 210   free (file_name);
 211
 212   file_name = malloc (strlen (directory) + strlen ("/mime/generic-icons") + 1);
 213   strcpy (file_name, directory); strcat (file_name, "/mime/generic-icons");
 214   _xdg_mime_icon_read_from_file (generic_icon_list, file_name);
 215   free (file_name);
 216
 217   return FALSE; /* Keep processing */
 218 }
 219
 220 /* Runs a command on all the directories in the search path */
 221 static void
 222 xdg_run_command_on_dirs (XdgDirectoryFunc  func,
 223                          void             *user_data)
 224 {
 225   const char *xdg_data_home;
 226   const char *xdg_data_dirs;
 227   const char *ptr;
 228
 229   xdg_data_home = getenv ("XDG_DATA_HOME");
 230   if (xdg_data_home)
 231     {
 232       if ((func) (xdg_data_home, user_data))
 233         return;
 234     }
 235   else
 236     {
 237       const char *home;
 238
 239       home = getenv ("HOME");
 240       if (home != NULL)
 241         {
 242           char *guessed_xdg_home;
 243           int stop_processing;
 244
 245           guessed_xdg_home = malloc (strlen (home) + strlen ("/.local/share/") + 1);
 246           strcpy (guessed_xdg_home, home);
 247           strcat (guessed_xdg_home, "/.local/share/");
 248           stop_processing = (func) (guessed_xdg_home, user_data);
 249           free (guessed_xdg_home);
 250
 251           if (stop_processing)
 252             return;
 253         }
 254     }
 255
 256   xdg_data_dirs = getenv ("XDG_DATA_DIRS");
 257   if (xdg_data_dirs == NULL)
 258     xdg_data_dirs = "/usr/local/share/:/usr/share/";
 259
 260   ptr = xdg_data_dirs;
 261
 262   while (*ptr != '\000')
 263     {
 264       const char *end_ptr;
 265       char *dir;
 266       int len;
 267       int stop_processing;
 268
 269       end_ptr = ptr;
 270       while (*end_ptr != ':' && *end_ptr != '\000')
 271         end_ptr ++;
 272
 273       if (end_ptr == ptr)
 274         {
 275           ptr++;
 276           continue;
 277         }
 278
 279       if (*end_ptr == ':')
 280         len = end_ptr - ptr;
 281       else
 282         len = end_ptr - ptr + 1;
 283       dir = malloc (len + 1);
 284       strncpy (dir, ptr, len);
 285       dir[len] = '\0';
 286       stop_processing = (func) (dir, user_data);
 287       free (dir);
 288
 289       if (stop_processing)
 290         return;
 291
 292       ptr = end_ptr;
 293     }
 294 }
 295
 296 /* Checks file_path to make sure it has the same mtime as last time it was
 297  * checked.  If it has a different mtime, or if the file doesn't exist, it
 298  * returns FALSE.
 299  *
 300  * FIXME: This doesn't protect against permission changes.
 301  */
 302 static int
 303 xdg_check_file (const char *file_path,
 304                 int        *exists)
 305 {
 306   struct stat st;
 307
 308   /* If the file exists */
 309   if (stat (file_path, &st) == 0)
 310     {
 311       XdgDirTimeList *list;
 312
 313       if (exists)
 314         *exists = TRUE;
 315
 316       for (list = dir_time_list; list; list = list->next)
 317         {
 318           if (! strcmp (list->directory_name, file_path))
 319             {
 320               if (st.st_mtime == list->mtime)
 321                 list->checked = XDG_CHECKED_VALID;
 322               else
 323                 list->checked = XDG_CHECKED_INVALID;
 324
 325               return (list->checked != XDG_CHECKED_VALID);
 326             }
 327         }
 328       return TRUE;
 329     }
 330
 331   if (exists)
 332     *exists = FALSE;
 333
 334   return FALSE;
 335 }
 336
 337 static int
 338 xdg_check_dir (const char *directory,
 339                int        *invalid_dir_list)
 340 {
 341   int invalid, exists;
 342   char *file_name;
 343
 344   assert (directory != NULL);
 345
 346   /* Check the mime.cache file */
 347   file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
 348   strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
 349   invalid = xdg_check_file (file_name, &exists);
 350   free (file_name);
 351   if (invalid)
 352     {
 353       *invalid_dir_list = TRUE;
 354       return TRUE;
 355     }
 356   else if (exists)
 357     {
 358       return FALSE;
 359     }
 360
 361   /* Check the globs file */
 362   file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
 363   strcpy (file_name, directory); strcat (file_name, "/mime/globs");
 364   invalid = xdg_check_file (file_name, NULL);
 365   free (file_name);
 366   if (invalid)
 367     {
 368       *invalid_dir_list = TRUE;
 369       return TRUE;
 370     }
 371
 372   /* Check the magic file */
 373   file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
 374   strcpy (file_name, directory); strcat (file_name, "/mime/magic");
 375   invalid = xdg_check_file (file_name, NULL);
 376   free (file_name);
 377   if (invalid)
 378     {
 379       *invalid_dir_list = TRUE;
 380       return TRUE;
 381     }
 382
 383   return FALSE; /* Keep processing */
 384 }
 385
 386 /* Walks through all the mime files stat()ing them to see if they've changed.
 387  * Returns TRUE if they have. */
 388 static int
 389 xdg_check_dirs (void)
 390 {
 391   XdgDirTimeList *list;
 392   int invalid_dir_list = FALSE;
 393
 394   for (list = dir_time_list; list; list = list->next)
 395     list->checked = XDG_CHECKED_UNCHECKED;
 396
 397   xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_check_dir,
 398                            &invalid_dir_list);
 399
 400   if (invalid_dir_list)
 401     return TRUE;
 402
 403   for (list = dir_time_list; list; list = list->next)
 404     {
 405       if (list->checked != XDG_CHECKED_VALID)
 406         return TRUE;
 407     }
 408
 409   return FALSE;
 410 }
 411
 412 /* We want to avoid stat()ing on every single mime call, so we only look for
 413  * newer files every 5 seconds.  This will return TRUE if we need to reread the
 414  * mime data from disk.
 415  */
 416 static int
 417 xdg_check_time_and_dirs (void)
 418 {
 419   struct timeval tv;
 420   time_t current_time;
 421   int retval = FALSE;
 422
 423   gettimeofday (&tv, NULL);
 424   current_time = tv.tv_sec;
 425
 426   if (current_time >= last_stat_time + 5)
 427     {
 428       retval = xdg_check_dirs ();
 429       last_stat_time = current_time;
 430     }
 431
 432   return retval;
 433 }
 434
 435 /* Called in every public function.  It reloads the hash function if need be.
 436  */
 437 static void
 438 xdg_mime_init (void)
 439 {
 440   if (xdg_check_time_and_dirs ())
 441     {
 442       xdg_mime_shutdown ();
 443     }
 444
 445   if (need_reread)
 446     {
 447       global_hash = _xdg_glob_hash_new ();
 448       global_magic = _xdg_mime_magic_new ();
 449       alias_list = _xdg_mime_alias_list_new ();
 450       parent_list = _xdg_mime_parent_list_new ();
 451       icon_list = _xdg_mime_icon_list_new ();
 452       generic_icon_list = _xdg_mime_icon_list_new ();
 453
 454       xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_mime_init_from_directory,
 455                                NULL);
 456
 457       need_reread = FALSE;
 458     }
 459 }
 460
 461 const char *
 462 xdg_mime_get_mime_type_for_data (const void *data,
 463                                  size_t      len,
 464                                  int        *result_prio)
 465 {
 466   const char *mime_type;
 467
 468   xdg_mime_init ();
 469
 470   if (_caches)
 471     return _xdg_mime_cache_get_mime_type_for_data (data, len, result_prio);
 472
 473   mime_type = _xdg_mime_magic_lookup_data (global_magic, data, len, result_prio, NULL, 0);
 474
 475   if (mime_type)
 476     return mime_type;
 477
 478   return XDG_MIME_TYPE_UNKNOWN;
 479 }
 480
 481 #ifdef NOT_USED_IN_GIO
 482
 483 const char *
 484 xdg_mime_get_mime_type_for_file (const char  *file_name,
 485                                  struct stat *statbuf)
 486 {
 487   const char *mime_type;
 488   /* currently, only a few globs occur twice, and none
 489    * more often, so 5 seems plenty.
 490    */
 491   const char *mime_types[5];
 492   FILE *file;
 493   unsigned char *data;
 494   int max_extent;
 495   int bytes_read;
 496   struct stat buf;
 497   const char *base_name;
 498   int n;
 499
 500   if (file_name == NULL)
 501     return NULL;
 502   if (! _xdg_utf8_validate (file_name))
 503     return NULL;
 504
 505   xdg_mime_init ();
 506
 507   if (_caches)
 508     return _xdg_mime_cache_get_mime_type_for_file (file_name, statbuf);
 509
 510   base_name = _xdg_get_base_name (file_name);
 511   n = _xdg_glob_hash_lookup_file_name (global_hash, base_name, mime_types, 5);
 512
 513   if (n == 1)
 514     return mime_types[0];
 515
 516   if (!statbuf)
 517     {
 518       if (stat (file_name, &buf) != 0)
 519         return XDG_MIME_TYPE_UNKNOWN;
 520
 521       statbuf = &buf;
 522     }
 523
 524   if (!S_ISREG (statbuf->st_mode))
 525     return XDG_MIME_TYPE_UNKNOWN;
 526
 527   /* FIXME: Need to make sure that max_extent isn't totally broken.  This could
 528    * be large and need getting from a stream instead of just reading it all
 529    * in. */
 530   max_extent = _xdg_mime_magic_get_buffer_extents (global_magic);
 531   data = malloc (max_extent);
 532   if (data == NULL)
 533     return XDG_MIME_TYPE_UNKNOWN;
 534
 535   file = fopen (file_name, "r");
 536   if (file == NULL)
 537     {
 538       free (data);
 539       return XDG_MIME_TYPE_UNKNOWN;
 540     }
 541
 542   bytes_read = fread (data, 1, max_extent, file);
 543   if (ferror (file))
 544     {
 545       free (data);
 546       fclose (file);
 547       return XDG_MIME_TYPE_UNKNOWN;
 548     }
 549
 550   mime_type = _xdg_mime_magic_lookup_data (global_magic, data, bytes_read, NULL,
 551                                            mime_types, n);
 552
 553   free (data);
 554   fclose (file);
 555
 556   if (mime_type)
 557     return mime_type;
 558
 559   return XDG_MIME_TYPE_UNKNOWN;
 560 }
 561
 562 const char *
 563 xdg_mime_get_mime_type_from_file_name (const char *file_name)
 564 {
 565   const char *mime_type;
 566
 567   xdg_mime_init ();
 568
 569   if (_caches)
 570     return _xdg_mime_cache_get_mime_type_from_file_name (file_name);
 571
 572   if (_xdg_glob_hash_lookup_file_name (global_hash, file_name, &mime_type, 1))
 573     return mime_type;
 574   else
 575     return XDG_MIME_TYPE_UNKNOWN;
 576 }
 577
 578 #endif
 579
 580 int
 581 xdg_mime_get_mime_types_from_file_name (const char *file_name,
 582                                         const char  *mime_types[],
 583                                         int          n_mime_types)
 584 {
 585   xdg_mime_init ();
 586
 587   if (_caches)
 588     return _xdg_mime_cache_get_mime_types_from_file_name (file_name, mime_types, n_mime_types);
 589
 590   return _xdg_glob_hash_lookup_file_name (global_hash, file_name, mime_types, n_mime_types);
 591 }
 592
 593 #ifdef NOT_USED_IN_GIO
 594
 595 int
 596 xdg_mime_is_valid_mime_type (const char *mime_type)
 597 {
 598   /* FIXME: We should make this a better test
 599    */
 600   return _xdg_utf8_validate (mime_type);
 601 }
 602
 603 #endif
 604
 605 void
 606 xdg_mime_shutdown (void)
 607 {
 608   XdgCallbackList *list;
 609
 610   /* FIXME: Need to make this (and the whole library) thread safe */
 611   if (dir_time_list)
 612     {
 613       xdg_dir_time_list_free (dir_time_list);
 614       dir_time_list = NULL;
 615     }
 616
 617   if (global_hash)
 618     {
 619       _xdg_glob_hash_free (global_hash);
 620       global_hash = NULL;
 621     }
 622   if (global_magic)
 623     {
 624       _xdg_mime_magic_free (global_magic);
 625       global_magic = NULL;
 626     }
 627
 628   if (alias_list)
 629     {
 630       _xdg_mime_alias_list_free (alias_list);
 631       alias_list = NULL;
 632     }
 633
 634   if (parent_list)
 635     {
 636       _xdg_mime_parent_list_free (parent_list);
 637       parent_list = NULL;
 638     }
 639
 640   if (icon_list)
 641     {
 642       _xdg_mime_icon_list_free (icon_list);
 643       icon_list = NULL;
 644     }
 645
 646   if (generic_icon_list)
 647     {
 648       _xdg_mime_icon_list_free (generic_icon_list);
 649       generic_icon_list = NULL;
 650     }
 651
 652   if (_caches)
 653     {
 654       int i;
 655
 656       for (i = 0; i < n_caches; i++)
 657         _xdg_mime_cache_unref (_caches[i]);
 658       free (_caches);
 659       _caches = NULL;
 660       n_caches = 0;
 661     }
 662
 663   for (list = callback_list; list; list = list->next)
 664     (list->callback) (list->data);
 665
 666   need_reread = TRUE;
 667 }
 668
 669 int
 670 xdg_mime_get_max_buffer_extents (void)
 671 {
 672   xdg_mime_init ();
 673
 674   if (_caches)
 675     return _xdg_mime_cache_get_max_buffer_extents ();
 676
 677   return _xdg_mime_magic_get_buffer_extents (global_magic);
 678 }
 679
 680 const char *
 681 _xdg_mime_unalias_mime_type (const char *mime_type)
 682 {
 683   const char *lookup;
 684
 685   if (_caches)
 686     return _xdg_mime_cache_unalias_mime_type (mime_type);
 687
 688   if ((lookup = _xdg_mime_alias_list_lookup (alias_list, mime_type)) != NULL)
 689     return lookup;
 690
 691   return mime_type;
 692 }
 693
 694 const char *
 695 xdg_mime_unalias_mime_type (const char *mime_type)
 696 {
 697   xdg_mime_init ();
 698
 699   return _xdg_mime_unalias_mime_type (mime_type);
 700 }
 701
 702 int
 703 _xdg_mime_mime_type_equal (const char *mime_a,
 704                            const char *mime_b)
 705 {
 706   const char *unalias_a, *unalias_b;
 707
 708   unalias_a = _xdg_mime_unalias_mime_type (mime_a);
 709   unalias_b = _xdg_mime_unalias_mime_type (mime_b);
 710
 711   if (strcmp (unalias_a, unalias_b) == 0)
 712     return 1;
 713
 714   return 0;
 715 }
 716
 717 int
 718 xdg_mime_mime_type_equal (const char *mime_a,
 719                           const char *mime_b)
 720 {
 721   xdg_mime_init ();
 722
 723   return _xdg_mime_mime_type_equal (mime_a, mime_b);
 724 }
 725
 726 int
 727 xdg_mime_media_type_equal (const char *mime_a,
 728                            const char *mime_b)
 729 {
 730   char *sep;
 731
 732   sep = strchr (mime_a, '/');
 733
 734   if (sep && strncmp (mime_a, mime_b, sep - mime_a + 1) == 0)
 735     return 1;
 736
 737   return 0;
 738 }
 739
 740 #if 1
 741 static int
 742 ends_with (const char *str,
 743            const char *suffix)
 744 {
 745   int length;
 746   int suffix_length;
 747
 748   length = strlen (str);
 749   suffix_length = strlen (suffix);
 750   if (length < suffix_length)
 751     return 0;
 752
 753   if (strcmp (str + length - suffix_length, suffix) == 0)
 754     return 1;
 755
 756   return 0;
 757 }
 758
 759 static int
 760 xdg_mime_is_super_type (const char *mime)
 761 {
 762   return ends_with (mime, "/*");
 763 }
 764 #endif
 765
 766 int
 767 _xdg_mime_mime_type_subclass (const char *mime,
 768                               const char *base)
 769 {
 770   const char *umime, *ubase;
 771   const char **parents;
 772
 773   if (_caches)
 774     return _xdg_mime_cache_mime_type_subclass (mime, base);
 775
 776   umime = _xdg_mime_unalias_mime_type (mime);
 777   ubase = _xdg_mime_unalias_mime_type (base);
 778
 779   if (strcmp (umime, ubase) == 0)
 780     return 1;
 781
 782 #if 1
 783   /* Handle supertypes */
 784   if (xdg_mime_is_super_type (ubase) &&
 785       xdg_mime_media_type_equal (umime, ubase))
 786     return 1;
 787 #endif
 788
 789   /*  Handle special cases text/plain and application/octet-stream */
 790   if (strcmp (ubase, "text/plain") == 0 &&
 791       strncmp (umime, "text/", 5) == 0)
 792     return 1;
 793
 794   if (strcmp (ubase, "application/octet-stream") == 0 &&
 795       strncmp (umime, "inode/", 6) != 0)
 796     return 1;
 797
 798   parents = _xdg_mime_parent_list_lookup (parent_list, umime);
 799   for (; parents && *parents; parents++)
 800     {
 801       if (_xdg_mime_mime_type_subclass (*parents, ubase))
 802         return 1;
 803     }
 804
 805   return 0;
 806 }
 807
 808 int
 809 xdg_mime_mime_type_subclass (const char *mime,
 810                              const char *base)
 811 {
 812   xdg_mime_init ();
 813
 814   return _xdg_mime_mime_type_subclass (mime, base);
 815 }
 816
 817 char **
 818 xdg_mime_list_mime_parents (const char *mime)
 819 {
 820   const char *umime;
 821   const char **parents;
 822   char **result;
 823   int i, n;
 824
 825   xdg_mime_init ();
 826
 827   if (_caches)
 828     return _xdg_mime_cache_list_mime_parents (mime);
 829
 830   umime = _xdg_mime_unalias_mime_type (mime);
 831
 832   parents = _xdg_mime_parent_list_lookup (parent_list, umime);
 833
 834   if (!parents)
 835     return NULL;
 836
 837   for (i = 0; parents[i]; i++) ;
 838
 839   n = (i + 1) * sizeof (char *);
 840   result = (char **) malloc (n);
 841   memcpy (result, parents, n);
 842
 843   return result;
 844 }
 845
 846 #ifdef NOT_USED_IN_GIO
 847
 848 const char **
 849 xdg_mime_get_mime_parents (const char *mime)
 850 {
 851   const char *umime;
 852
 853   xdg_mime_init ();
 854
 855   umime = _xdg_mime_unalias_mime_type (mime);
 856
 857   return _xdg_mime_parent_list_lookup (parent_list, umime);
 858 }
 859
 860 void
 861 xdg_mime_dump (void)
 862 {
 863   xdg_mime_init();
 864
 865   printf ("*** ALIASES ***\n\n");
 866   _xdg_mime_alias_list_dump (alias_list);
 867   printf ("\n*** PARENTS ***\n\n");
 868   _xdg_mime_parent_list_dump (parent_list);
 869   printf ("\n*** CACHE ***\n\n");
 870   _xdg_glob_hash_dump (global_hash);
 871   printf ("\n*** GLOBS ***\n\n");
 872   _xdg_glob_hash_dump (global_hash);
 873   printf ("\n*** GLOBS REVERSE TREE ***\n\n");
 874   _xdg_mime_cache_glob_dump ();
 875 }
 876
 877 #endif
 878
 879 /* Registers a function to be called every time the mime database reloads its files
 880  */
 881 int
 882 xdg_mime_register_reload_callback (XdgMimeCallback  callback,
 883                                    void            *data,
 884                                    XdgMimeDestroy   destroy)
 885 {
 886   XdgCallbackList *list_el;
 887   static int callback_id = 1;
 888
 889   /* Make a new list element */
 890   list_el = calloc (1, sizeof (XdgCallbackList));
 891   list_el->callback_id = callback_id;
 892   list_el->callback = callback;
 893   list_el->data = data;
 894   list_el->destroy = destroy;
 895   list_el->next = callback_list;
 896   if (list_el->next)
 897     list_el->next->prev = list_el;
 898
 899   callback_list = list_el;
 900   callback_id ++;
 901
 902   return callback_id - 1;
 903 }
 904
 905 #ifdef NOT_USED_IN_GIO
 906
 907 void
 908 xdg_mime_remove_callback (int callback_id)
 909 {
 910   XdgCallbackList *list;
 911
 912   for (list = callback_list; list; list = list->next)
 913     {
 914       if (list->callback_id == callback_id)
 915         {
 916           if (list->next)
 917             list->next = list->prev;
 918
 919           if (list->prev)
 920             list->prev->next = list->next;
 921           else
 922             callback_list = list->next;
 923
 924           /* invoke the destroy handler */
 925           (list->destroy) (list->data);
 926           free (list);
 927           return;
 928         }
 929     }
 930 }
 931
 932 #endif
 933
 934 const char *
 935 xdg_mime_get_icon (const char *mime)
 936 {
 937   xdg_mime_init ();
 938
 939   if (_caches)
 940     return _xdg_mime_cache_get_icon (mime);
 941
 942   return _xdg_mime_icon_list_lookup (icon_list, mime);
 943 }
 944
 945 const char *
 946 xdg_mime_get_generic_icon (const char *mime)
 947 {
 948   xdg_mime_init ();
 949
 950   if (_caches)
 951     return _xdg_mime_cache_get_generic_icon (mime);
 952
 953   return _xdg_mime_icon_list_lookup (generic_icon_list, mime);
 954 }