src/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 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, write to the
  24  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25  * Boston, MA 02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include <config.h>
  30 #endif
  31
  32 #include "xdgmime.h"
  33 #include "xdgmimeint.h"
  34 #include "xdgmimeglob.h"
  35 #include "xdgmimemagic.h"
  36 #include "xdgmimealias.h"
  37 #include "xdgmimeicon.h"
  38 #include "xdgmimeparent.h"
  39 #include "xdgmimecache.h"
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <sys/stat.h>
  43 #include <sys/types.h>
  44 #include <sys/time.h>
  45 #include <unistd.h>
  46 #include <assert.h>
  47
  48 typedef struct XdgDirTimeList XdgDirTimeList;
  49 typedef struct XdgCallbackList XdgCallbackList;
  50
  51 static int need_reread = TRUE;
  52 static time_t last_stat_time = 0;
  53
  54 static XdgGlobHash *global_hash = NULL;
  55 static XdgMimeMagic *global_magic = NULL;
  56 static XdgAliasList *alias_list = NULL;
  57 static XdgParentList *parent_list = NULL;
  58 static XdgDirTimeList *dir_time_list = NULL;
  59 static XdgCallbackList *callback_list = NULL;
  60 static XdgIconList *icon_list = NULL;
  61 static XdgIconList *generic_icon_list = NULL;
  62
  63 XdgMimeCache **_caches = NULL;
  64 static int n_caches = 0;
  65
  66 const char xdg_mime_type_unknown[] = "application/octet-stream";
  67
  68
  69 enum
  70 {
  71   XDG_CHECKED_UNCHECKED,
  72   XDG_CHECKED_VALID,
  73   XDG_CHECKED_INVALID
  74 };
  75
  76 struct XdgDirTimeList
  77 {
  78   time_t mtime;
  79   char *directory_name;
  80   int checked;
  81   XdgDirTimeList *next;
  82 };
  83
  84 struct XdgCallbackList
  85 {
  86   XdgCallbackList *next;
  87   XdgCallbackList *prev;
  88   int              callback_id;
  89   XdgMimeCallback  callback;
  90   void            *data;
  91   XdgMimeDestroy   destroy;
  92 };
  93
  94 /* Function called by xdg_run_command_on_dirs.  If it returns TRUE, further
  95  * directories aren't looked at */
  96 typedef int (*XdgDirectoryFunc) (const char *directory,
  97                                  void       *user_data);
  98
  99 static void
 100 xdg_dir_time_list_add (char   *file_name,
 101                        time_t  mtime)
 102 {
 103   XdgDirTimeList *list;
 104
 105   for (list = dir_time_list; list; list = list->next)
 106     {
 107       if (strcmp (list->directory_name, file_name) == 0)
 108         {
 109           free (file_name);
 110           return;
 111         }
 112     }
 113
 114   list = calloc (1, sizeof (XdgDirTimeList));
 115   list->checked = XDG_CHECKED_UNCHECKED;
 116   list->directory_name = file_name;
 117   list->mtime = mtime;
 118   list->next = dir_time_list;
 119   dir_time_list = list;
 120 }
 121
 122 static void
 123 xdg_dir_time_list_free (XdgDirTimeList *list)
 124 {
 125   XdgDirTimeList *next;
 126
 127   while (list)
 128     {
 129       next = list->next;
 130       free (list->directory_name);
 131       free (list);
 132       list = next;
 133     }
 134 }
 135
 136 static int
 137 xdg_mime_init_from_directory (const char *directory)
 138 {
 139   char *file_name;
 140   struct stat st;
 141
 142   assert (directory != NULL);
 143
 144   file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
 145   strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
 146   if (stat (file_name, &st) == 0)
 147     {
 148       XdgMimeCache *cache = _xdg_mime_cache_new_from_file (file_name);
 149
 150       if (cache != NULL)
 151         {
 152           xdg_dir_time_list_add (file_name, st.st_mtime);
 153
 154           _caches = realloc (_caches, sizeof (XdgMimeCache *) * (n_caches + 2));
 155           _caches[n_caches] = cache;
 156           _caches[n_caches + 1] = NULL;
 157           n_caches++;
 158
 159           return FALSE;
 160         }
 161     }
 162   free (file_name);
 163
 164   file_name = malloc (strlen (directory) + strlen ("/mime/globs2") + 1);
 165   strcpy (file_name, directory); strcat (file_name, "/mime/globs2");
 166   if (stat (file_name, &st) == 0)
 167     {
 168       _xdg_mime_glob_read_from_file (global_hash, file_name);
 169       xdg_dir_time_list_add (file_name, st.st_mtime);
 170     }
 171   else
 172     {
 173       free (file_name);
 174       file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
 175       strcpy (file_name, directory); strcat (file_name, "/mime/globs");
 176       if (stat (file_name, &st) == 0)
 177         {
 178           _xdg_mime_glob_read_from_file (global_hash, file_name);
 179           xdg_dir_time_list_add (file_name, st.st_mtime);
 180         }
 181       else
 182         {
 183           free (file_name);
 184         }
 185     }
 186
 187   file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
 188   strcpy (file_name, directory); strcat (file_name, "/mime/magic");
 189   if (stat (file_name, &st) == 0)
 190     {
 191       _xdg_mime_magic_read_from_file (global_magic, file_name);
 192       xdg_dir_time_list_add (file_name, st.st_mtime);
 193     }
 194   else
 195     {
 196       free (file_name);
 197     }
 198
 199   file_name = malloc (strlen (directory) + strlen ("/mime/aliases") + 1);
 200   strcpy (file_name, directory); strcat (file_name, "/mime/aliases");
 201   _xdg_mime_alias_read_from_file (alias_list, file_name);
 202   free (file_name);
 203
 204   file_name = malloc (strlen (directory) + strlen ("/mime/subclasses") + 1);
 205   strcpy (file_name, directory); strcat (file_name, "/mime/subclasses");
 206   _xdg_mime_parent_read_from_file (parent_list, file_name);
 207   free (file_name);
 208
 209   file_name = malloc (strlen (directory) + strlen ("/mime/icons") + 1);
 210   strcpy (file_name, directory); strcat (file_name, "/mime/icons");
 211   _xdg_mime_icon_read_from_file (icon_list, file_name);
 212   free (file_name);
 213
 214   file_name = malloc (strlen (directory) + strlen ("/mime/generic-icons") + 1);
 215   strcpy (file_name, directory); strcat (file_name, "/mime/generic-icons");
 216   _xdg_mime_icon_read_from_file (generic_icon_list, file_name);
 217   free (file_name);
 218
 219   return FALSE; /* Keep processing */
 220 }
 221
 222 /* Runs a command on all the directories in the search path */
 223 static void
 224 xdg_run_command_on_dirs (XdgDirectoryFunc  func,
 225                          void             *user_data)
 226 {
 227   const char *xdg_data_home;
 228   const char *xdg_data_dirs;
 229   const char *ptr;
 230
 231   xdg_data_home = getenv ("XDG_DATA_HOME");
 232   if (xdg_data_home)
 233     {
 234       if ((func) (xdg_data_home, user_data))
 235         return;
 236     }
 237   else
 238     {
 239       const char *home;
 240
 241       home = getenv ("HOME");
 242       if (home != NULL)
 243         {
 244           char *guessed_xdg_home;
 245           int stop_processing;
 246
 247           guessed_xdg_home = malloc (strlen (home) + strlen ("/.local/share/") + 1);
 248           strcpy (guessed_xdg_home, home);
 249           strcat (guessed_xdg_home, "/.local/share/");
 250           stop_processing = (func) (guessed_xdg_home, user_data);
 251           free (guessed_xdg_home);
 252
 253           if (stop_processing)
 254             return;
 255         }
 256     }
 257
 258   xdg_data_dirs = getenv ("XDG_DATA_DIRS");
 259   if (xdg_data_dirs == NULL)
 260     xdg_data_dirs = "/usr/local/share/:/usr/share/";
 261
 262   ptr = xdg_data_dirs;
 263
 264   while (*ptr != '\000')
 265     {
 266       const char *end_ptr;
 267       char *dir;
 268       int len;
 269       int stop_processing;
 270
 271       end_ptr = ptr;
 272       while (*end_ptr != ':' && *end_ptr != '\000')
 273         end_ptr ++;
 274
 275       if (end_ptr == ptr)
 276         {
 277           ptr++;
 278           continue;
 279         }
 280
 281       if (*end_ptr == ':')
 282         len = end_ptr - ptr;
 283       else
 284         len = end_ptr - ptr + 1;
 285       dir = malloc (len + 1);
 286       strncpy (dir, ptr, len);
 287       dir[len] = '\0';
 288       stop_processing = (func) (dir, user_data);
 289       free (dir);
 290
 291       if (stop_processing)
 292         return;
 293
 294       ptr = end_ptr;
 295     }
 296 }
 297
 298 /* Checks file_path to make sure it has the same mtime as last time it was
 299  * checked.  If it has a different mtime, or if the file doesn't exist, it
 300  * returns FALSE.
 301  *
 302  * FIXME: This doesn't protect against permission changes.
 303  */
 304 static int
 305 xdg_check_file (const char *file_path,
 306                 int        *exists)
 307 {
 308   struct stat st;
 309
 310   /* If the file exists */
 311   if (stat (file_path, &st) == 0)
 312     {
 313       XdgDirTimeList *list;
 314
 315       if (exists)
 316         *exists = TRUE;
 317
 318       for (list = dir_time_list; list; list = list->next)
 319         {
 320           if (! strcmp (list->directory_name, file_path))
 321             {
 322               if (st.st_mtime == list->mtime)
 323                 list->checked = XDG_CHECKED_VALID;
 324               else
 325                 list->checked = XDG_CHECKED_INVALID;
 326
 327               return (list->checked != XDG_CHECKED_VALID);
 328             }
 329         }
 330       return TRUE;
 331     }
 332
 333   if (exists)
 334     *exists = FALSE;
 335
 336   return FALSE;
 337 }
 338
 339 static int
 340 xdg_check_dir (const char *directory,
 341                int        *invalid_dir_list)
 342 {
 343   int invalid, exists;
 344   char *file_name;
 345
 346   assert (directory != NULL);
 347
 348   /* Check the mime.cache file */
 349   file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
 350   strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
 351   invalid = xdg_check_file (file_name, &exists);
 352   free (file_name);
 353   if (invalid)
 354     {
 355       *invalid_dir_list = TRUE;
 356       return TRUE;
 357     }
 358   else if (exists)
 359     {
 360       return FALSE;
 361     }
 362
 363   /* Check the globs file */
 364   file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
 365   strcpy (file_name, directory); strcat (file_name, "/mime/globs");
 366   invalid = xdg_check_file (file_name, NULL);
 367   free (file_name);
 368   if (invalid)
 369     {
 370       *invalid_dir_list = TRUE;
 371       return TRUE;
 372     }
 373
 374   /* Check the magic file */
 375   file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
 376   strcpy (file_name, directory); strcat (file_name, "/mime/magic");
 377   invalid = xdg_check_file (file_name, NULL);
 378   free (file_name);
 379   if (invalid)
 380     {
 381       *invalid_dir_list = TRUE;
 382       return TRUE;
 383     }
 384
 385   return FALSE; /* Keep processing */
 386 }
 387
 388 /* Walks through all the mime files stat()ing them to see if they've changed.
 389  * Returns TRUE if they have. */
 390 static int
 391 xdg_check_dirs (void)
 392 {
 393   XdgDirTimeList *list;
 394   int invalid_dir_list = FALSE;
 395
 396   for (list = dir_time_list; list; list = list->next)
 397     list->checked = XDG_CHECKED_UNCHECKED;
 398
 399   xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_check_dir,
 400                            &invalid_dir_list);
 401
 402   if (invalid_dir_list)
 403     return TRUE;
 404
 405   for (list = dir_time_list; list; list = list->next)
 406     {
 407       if (list->checked != XDG_CHECKED_VALID)
 408         return TRUE;
 409     }
 410
 411   return FALSE;
 412 }
 413
 414 /* We want to avoid stat()ing on every single mime call, so we only look for
 415  * newer files every 5 seconds.  This will return TRUE if we need to reread the
 416  * mime data from disk.
 417  */
 418 static int
 419 xdg_check_time_and_dirs (void)
 420 {
 421   struct timeval tv;
 422   time_t current_time;
 423   int retval = FALSE;
 424
 425   gettimeofday (&tv, NULL);
 426   current_time = tv.tv_sec;
 427
 428   if (current_time >= last_stat_time + 5)
 429     {
 430       retval = xdg_check_dirs ();
 431       last_stat_time = current_time;
 432     }
 433
 434   return retval;
 435 }
 436
 437 /* Called in every public function.  It reloads the hash function if need be.
 438  */
 439 static void
 440 xdg_mime_init (void)
 441 {
 442   if (xdg_check_time_and_dirs ())
 443     {
 444       xdg_mime_shutdown ();
 445     }
 446
 447   if (need_reread)
 448     {
 449       global_hash = _xdg_glob_hash_new ();
 450       global_magic = _xdg_mime_magic_new ();
 451       alias_list = _xdg_mime_alias_list_new ();
 452       parent_list = _xdg_mime_parent_list_new ();
 453       icon_list = _xdg_mime_icon_list_new ();
 454       generic_icon_list = _xdg_mime_icon_list_new ();
 455
 456       xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_mime_init_from_directory,
 457                                NULL);
 458
 459       need_reread = FALSE;
 460     }
 461 }
 462
 463 const char *
 464 xdg_mime_get_mime_type_for_data (const void *data,
 465                                  size_t      len,
 466                                  int        *result_prio)
 467 {
 468   const char *mime_type;
 469
 470   xdg_mime_init ();
 471
 472   if (_caches)
 473     return _xdg_mime_cache_get_mime_type_for_data (data, len, result_prio);
 474
 475   mime_type = _xdg_mime_magic_lookup_data (global_magic, data, len, result_prio, NULL, 0);
 476
 477   if (mime_type)
 478     return mime_type;
 479
 480   return XDG_MIME_TYPE_UNKNOWN;
 481 }
 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 int
 579 xdg_mime_get_mime_types_from_file_name (const char *file_name,
 580                                         const char  *mime_types[],
 581                                         int          n_mime_types)
 582 {
 583   xdg_mime_init ();
 584
 585   if (_caches)
 586     return _xdg_mime_cache_get_mime_types_from_file_name (file_name, mime_types, n_mime_types);
 587
 588   return _xdg_glob_hash_lookup_file_name (global_hash, file_name, mime_types, n_mime_types);
 589 }
 590
 591 int
 592 xdg_mime_is_valid_mime_type (const char *mime_type)
 593 {
 594   /* FIXME: We should make this a better test
 595    */
 596   return _xdg_utf8_validate (mime_type);
 597 }
 598
 599 void
 600 xdg_mime_shutdown (void)
 601 {
 602   XdgCallbackList *list;
 603
 604   /* FIXME: Need to make this (and the whole library) thread safe */
 605   if (dir_time_list)
 606     {
 607       xdg_dir_time_list_free (dir_time_list);
 608       dir_time_list = NULL;
 609     }
 610
 611   if (global_hash)
 612     {
 613       _xdg_glob_hash_free (global_hash);
 614       global_hash = NULL;
 615     }
 616   if (global_magic)
 617     {
 618       _xdg_mime_magic_free (global_magic);
 619       global_magic = NULL;
 620     }
 621
 622   if (alias_list)
 623     {
 624       _xdg_mime_alias_list_free (alias_list);
 625       alias_list = NULL;
 626     }
 627
 628   if (parent_list)
 629     {
 630       _xdg_mime_parent_list_free (parent_list);
 631       parent_list = NULL;
 632     }
 633
 634   if (icon_list)
 635     {
 636       _xdg_mime_icon_list_free (icon_list);
 637       icon_list = NULL;
 638     }
 639
 640   if (generic_icon_list)
 641     {
 642       _xdg_mime_icon_list_free (generic_icon_list);
 643       generic_icon_list = NULL;
 644     }
 645
 646   if (_caches)
 647     {
 648       int i;
 649
 650       for (i = 0; i < n_caches; i++)
 651         _xdg_mime_cache_unref (_caches[i]);
 652       free (_caches);
 653       _caches = NULL;
 654       n_caches = 0;
 655     }
 656
 657   for (list = callback_list; list; list = list->next)
 658     (list->callback) (list->data);
 659
 660   need_reread = TRUE;
 661 }
 662
 663 int
 664 xdg_mime_get_max_buffer_extents (void)
 665 {
 666   xdg_mime_init ();
 667
 668   if (_caches)
 669     return _xdg_mime_cache_get_max_buffer_extents ();
 670
 671   return _xdg_mime_magic_get_buffer_extents (global_magic);
 672 }
 673
 674 const char *
 675 _xdg_mime_unalias_mime_type (const char *mime_type)
 676 {
 677   const char *lookup;
 678
 679   if (_caches)
 680     return _xdg_mime_cache_unalias_mime_type (mime_type);
 681
 682   if ((lookup = _xdg_mime_alias_list_lookup (alias_list, mime_type)) != NULL)
 683     return lookup;
 684
 685   return mime_type;
 686 }
 687
 688 const char *
 689 xdg_mime_unalias_mime_type (const char *mime_type)
 690 {
 691   xdg_mime_init ();
 692
 693   return _xdg_mime_unalias_mime_type (mime_type);
 694 }
 695
 696 int
 697 _xdg_mime_mime_type_equal (const char *mime_a,
 698                            const char *mime_b)
 699 {
 700   const char *unalias_a, *unalias_b;
 701
 702   unalias_a = _xdg_mime_unalias_mime_type (mime_a);
 703   unalias_b = _xdg_mime_unalias_mime_type (mime_b);
 704
 705   if (strcmp (unalias_a, unalias_b) == 0)
 706     return 1;
 707
 708   return 0;
 709 }
 710
 711 int
 712 xdg_mime_mime_type_equal (const char *mime_a,
 713                           const char *mime_b)
 714 {
 715   xdg_mime_init ();
 716
 717   return _xdg_mime_mime_type_equal (mime_a, mime_b);
 718 }
 719
 720 int
 721 xdg_mime_media_type_equal (const char *mime_a,
 722                            const char *mime_b)
 723 {
 724   char *sep;
 725
 726   sep = strchr (mime_a, '/');
 727
 728   if (sep && strncmp (mime_a, mime_b, sep - mime_a + 1) == 0)
 729     return 1;
 730
 731   return 0;
 732 }
 733
 734 #if 1
 735 static int
 736 xdg_mime_is_super_type (const char *mime)
 737 {
 738   int length;
 739   const char *type;
 740
 741   length = strlen (mime);
 742   type = &(mime[length - 2]);
 743
 744   if (strcmp (type, "/*") == 0)
 745     return 1;
 746
 747   return 0;
 748 }
 749 #endif
 750
 751 int
 752 _xdg_mime_mime_type_subclass (const char *mime,
 753                               const char *base)
 754 {
 755   const char *umime, *ubase;
 756   const char **parents;
 757
 758   if (_caches)
 759     return _xdg_mime_cache_mime_type_subclass (mime, base);
 760
 761   umime = _xdg_mime_unalias_mime_type (mime);
 762   ubase = _xdg_mime_unalias_mime_type (base);
 763
 764   if (strcmp (umime, ubase) == 0)
 765     return 1;
 766
 767 #if 1
 768   /* Handle supertypes */
 769   if (xdg_mime_is_super_type (ubase) &&
 770       xdg_mime_media_type_equal (umime, ubase))
 771     return 1;
 772 #endif
 773
 774   /*  Handle special cases text/plain and application/octet-stream */
 775   if (strcmp (ubase, "text/plain") == 0 &&
 776       strncmp (umime, "text/", 5) == 0)
 777     return 1;
 778
 779   if (strcmp (ubase, "application/octet-stream") == 0)
 780     return 1;
 781
 782   parents = _xdg_mime_parent_list_lookup (parent_list, umime);
 783   for (; parents && *parents; parents++)
 784     {
 785       if (_xdg_mime_mime_type_subclass (*parents, ubase))
 786         return 1;
 787     }
 788
 789   return 0;
 790 }
 791
 792 int
 793 xdg_mime_mime_type_subclass (const char *mime,
 794                              const char *base)
 795 {
 796   xdg_mime_init ();
 797
 798   return _xdg_mime_mime_type_subclass (mime, base);
 799 }
 800
 801 char **
 802 xdg_mime_list_mime_parents (const char *mime)
 803 {
 804   const char **parents;
 805   char **result;
 806   int i, n;
 807
 808   if (_caches)
 809     return _xdg_mime_cache_list_mime_parents (mime);
 810
 811   parents = xdg_mime_get_mime_parents (mime);
 812
 813   if (!parents)
 814     return NULL;
 815
 816   for (i = 0; parents[i]; i++) ;
 817
 818   n = (i + 1) * sizeof (char *);
 819   result = (char **) malloc (n);
 820   memcpy (result, parents, n);
 821
 822   return result;
 823 }
 824
 825 const char **
 826 xdg_mime_get_mime_parents (const char *mime)
 827 {
 828   const char *umime;
 829
 830   xdg_mime_init ();
 831
 832   umime = _xdg_mime_unalias_mime_type (mime);
 833
 834   return _xdg_mime_parent_list_lookup (parent_list, umime);
 835 }
 836
 837 void
 838 xdg_mime_dump (void)
 839 {
 840   xdg_mime_init();
 841
 842   printf ("*** ALIASES ***\n\n");
 843   _xdg_mime_alias_list_dump (alias_list);
 844   printf ("\n*** PARENTS ***\n\n");
 845   _xdg_mime_parent_list_dump (parent_list);
 846   printf ("\n*** CACHE ***\n\n");
 847   _xdg_glob_hash_dump (global_hash);
 848   printf ("\n*** GLOBS ***\n\n");
 849   _xdg_glob_hash_dump (global_hash);
 850   printf ("\n*** GLOBS REVERSE TREE ***\n\n");
 851   _xdg_mime_cache_glob_dump ();
 852 }
 853
 854
 855 /* Registers a function to be called every time the mime database reloads its files
 856  */
 857 int
 858 xdg_mime_register_reload_callback (XdgMimeCallback  callback,
 859                                    void            *data,
 860                                    XdgMimeDestroy   destroy)
 861 {
 862   XdgCallbackList *list_el;
 863   static int callback_id = 1;
 864
 865   /* Make a new list element */
 866   list_el = calloc (1, sizeof (XdgCallbackList));
 867   list_el->callback_id = callback_id;
 868   list_el->callback = callback;
 869   list_el->data = data;
 870   list_el->destroy = destroy;
 871   list_el->next = callback_list;
 872   if (list_el->next)
 873     list_el->next->prev = list_el;
 874
 875   callback_list = list_el;
 876   callback_id ++;
 877
 878   return callback_id - 1;
 879 }
 880
 881 void
 882 xdg_mime_remove_callback (int callback_id)
 883 {
 884   XdgCallbackList *list;
 885
 886   for (list = callback_list; list; list = list->next)
 887     {
 888       if (list->callback_id == callback_id)
 889         {
 890           if (list->next)
 891             list->next = list->prev;
 892
 893           if (list->prev)
 894             list->prev->next = list->next;
 895           else
 896             callback_list = list->next;
 897
 898           /* invoke the destroy handler */
 899           (list->destroy) (list->data);
 900           free (list);
 901           return;
 902         }
 903     }
 904 }
 905
 906 const char *
 907 xdg_mime_get_icon (const char *mime)
 908 {
 909   const char *icon;
 910
 911   xdg_mime_init ();
 912
 913   if (_caches)
 914     return _xdg_mime_cache_get_icon (mime);
 915
 916   icon = _xdg_mime_icon_list_lookup (icon_list, mime);
 917
 918   if (!icon)
 919     icon = xdg_mime_get_generic_icon (mime);
 920
 921   return icon;
 922 }
 923
 924 const char *
 925 xdg_mime_get_generic_icon (const char *mime)
 926 {
 927   xdg_mime_init ();
 928
 929   if (_caches)
 930     return _xdg_mime_cache_get_generic_icon (mime);
 931
 932   return _xdg_mime_icon_list_lookup (generic_icon_list, mime);
 933 }