ROX-Filer/src/xdgmimeglob.c

   1 /* -*- mode: C; c-file-style: "gnu" -*- */
   2 /* xdgmimeglob.c: Private file.  Datastructure for storing the globs.
   3  *
   4  * More info can be found at http://www.freedesktop.org/standards/
   5  *
   6  * Copyright (C) 2003  Red Hat, Inc.
   7  * Copyright (C) 2003  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 "xdgmimeglob.h"
  33 #include "xdgmimeint.h"
  34 #include <stdlib.h>
  35 #include <stdio.h>
  36 #include <assert.h>
  37 #include <string.h>
  38 #include <fnmatch.h>
  39
  40 #ifndef FALSE
  41 #define FALSE   (0)
  42 #endif
  43
  44 #ifndef TRUE
  45 #define TRUE    (!FALSE)
  46 #endif
  47
  48 typedef struct XdgGlobHashNode XdgGlobHashNode;
  49 typedef struct XdgGlobList XdgGlobList;
  50
  51 struct XdgGlobHashNode
  52 {
  53   xdg_unichar_t character;
  54   const char *mime_type;
  55   XdgGlobHashNode *next;
  56   XdgGlobHashNode *child;
  57 };
  58 struct XdgGlobList
  59 {
  60   const char *data;
  61   const char *mime_type;
  62   XdgGlobList *next;
  63 };
  64
  65 struct XdgGlobHash
  66 {
  67   XdgGlobList *literal_list;
  68   XdgGlobHashNode *simple_node;
  69   XdgGlobList *full_list;
  70 };
  71
  72
  73 /* XdgGlobList
  74  */
  75 static XdgGlobList *
  76 _xdg_glob_list_new (void)
  77 {
  78   XdgGlobList *new_element;
  79
  80   new_element = calloc (1, sizeof (XdgGlobList));
  81
  82   return new_element;
  83 }
  84
  85 /* Frees glob_list and all of it's children */
  86 static void
  87 _xdg_glob_list_free (XdgGlobList *glob_list)
  88 {
  89   XdgGlobList *ptr, *next;
  90
  91   ptr = glob_list;
  92
  93   while (ptr != NULL)
  94     {
  95       next = ptr->next;
  96
  97       if (ptr->data)
  98         free ((void *) ptr->data);
  99       if (ptr->mime_type)
 100         free ((void *) ptr->mime_type);
 101       free (ptr);
 102
 103       ptr = next;
 104     }
 105 }
 106
 107 static XdgGlobList *
 108 _xdg_glob_list_append (XdgGlobList *glob_list,
 109                        void        *data,
 110                        const char  *mime_type)
 111 {
 112   XdgGlobList *new_element;
 113   XdgGlobList *tmp_element;
 114
 115   new_element = _xdg_glob_list_new ();
 116   new_element->data = data;
 117   new_element->mime_type = mime_type;
 118   if (glob_list == NULL)
 119     return new_element;
 120
 121   tmp_element = glob_list;
 122   while (tmp_element->next != NULL)
 123     tmp_element = tmp_element->next;
 124
 125   tmp_element->next = new_element;
 126
 127   return glob_list;
 128 }
 129
 130 #if 0
 131 static XdgGlobList *
 132 _xdg_glob_list_prepend (XdgGlobList *glob_list,
 133                         void        *data,
 134                         const char  *mime_type)
 135 {
 136   XdgGlobList *new_element;
 137
 138   new_element = _xdg_glob_list_new ();
 139   new_element->data = data;
 140   new_element->next = glob_list;
 141   new_element->mime_type = mime_type;
 142
 143   return new_element;
 144 }
 145 #endif
 146
 147 /* XdgGlobHashNode
 148  */
 149
 150 static XdgGlobHashNode *
 151 _xdg_glob_hash_node_new (void)
 152 {
 153   XdgGlobHashNode *glob_hash_node;
 154
 155   glob_hash_node = calloc (1, sizeof (XdgGlobHashNode));
 156
 157   return glob_hash_node;
 158 }
 159
 160 static void
 161 _xdg_glob_hash_node_dump (XdgGlobHashNode *glob_hash_node,
 162                           int depth)
 163 {
 164   int i;
 165   for (i = 0; i < depth; i++)
 166     printf (" ");
 167
 168   printf ("%c", (char)glob_hash_node->character);
 169   if (glob_hash_node->mime_type)
 170     printf (" - %s\n", glob_hash_node->mime_type);
 171   else
 172     printf ("\n");
 173   if (glob_hash_node->child)
 174     _xdg_glob_hash_node_dump (glob_hash_node->child, depth + 1);
 175   if (glob_hash_node->next)
 176     _xdg_glob_hash_node_dump (glob_hash_node->next, depth);
 177 }
 178
 179 static XdgGlobHashNode *
 180 _xdg_glob_hash_insert_text (XdgGlobHashNode *glob_hash_node,
 181                             const char      *text,
 182                             const char      *mime_type)
 183 {
 184   XdgGlobHashNode *node;
 185   xdg_unichar_t character;
 186
 187   character = _xdg_utf8_to_ucs4 (text);
 188
 189   if ((glob_hash_node == NULL) ||
 190       (character < glob_hash_node->character))
 191     {
 192       node = _xdg_glob_hash_node_new ();
 193       node->character = character;
 194       node->next = glob_hash_node;
 195       glob_hash_node = node;
 196     }
 197   else if (character == glob_hash_node->character)
 198     {
 199       node = glob_hash_node;
 200     }
 201   else
 202     {
 203       XdgGlobHashNode *prev_node;
 204       int found_node = FALSE;
 205
 206       /* Look for the first character of text in glob_hash_node, and insert it if we
 207        * have to.*/
 208       prev_node = glob_hash_node;
 209       node = prev_node->next;
 210
 211       while (node != NULL)
 212         {
 213           if (character < node->character)
 214             {
 215               node = _xdg_glob_hash_node_new ();
 216               node->character = character;
 217               node->next = prev_node->next;
 218               prev_node->next = node;
 219
 220               found_node = TRUE;
 221               break;
 222             }
 223           else if (character == node->character)
 224             {
 225               found_node = TRUE;
 226               break;
 227             }
 228           prev_node = node;
 229           node = node->next;
 230         }
 231
 232       if (! found_node)
 233         {
 234           node = _xdg_glob_hash_node_new ();
 235           node->character = character;
 236           node->next = prev_node->next;
 237           prev_node->next = node;
 238         }
 239     }
 240
 241   text = _xdg_utf8_next_char (text);
 242   if (*text == '\000')
 243     {
 244       if (node->mime_type)
 245         {
 246           if (strcmp (node->mime_type, mime_type))
 247             {
 248               XdgGlobHashNode *child;
 249               int found_node = FALSE;
 250
 251               child = node->child;
 252               while (child && child->character == '\0')
 253                 {
 254                   if (strcmp (child->mime_type, mime_type) == 0)
 255                     {
 256                       found_node = TRUE;
 257                       break;
 258                     }
 259                   child = child->next;
 260                 }
 261
 262               if (!found_node)
 263                 {
 264                   child = _xdg_glob_hash_node_new ();
 265                   child->character = '\000';
 266                   child->mime_type = strdup (mime_type);
 267                   child->child = NULL;
 268                   child->next = node->child;
 269                   node->child = child;
 270                 }
 271             }
 272         }
 273       else
 274         {
 275           node->mime_type = strdup (mime_type);
 276         }
 277     }
 278   else
 279     {
 280       node->child = _xdg_glob_hash_insert_text (node->child, text, mime_type);
 281     }
 282   return glob_hash_node;
 283 }
 284
 285 static int
 286 _xdg_glob_hash_node_lookup_file_name (XdgGlobHashNode *glob_hash_node,
 287                                       const char      *file_name,
 288                                       int              ignore_case,
 289                                       const char      *mime_types[],
 290                                       int              n_mime_types)
 291 {
 292   int n;
 293   XdgGlobHashNode *node;
 294   xdg_unichar_t character;
 295
 296   if (glob_hash_node == NULL)
 297     return 0;
 298
 299   character = _xdg_utf8_to_ucs4 (file_name);
 300   if (ignore_case)
 301     character = _xdg_ucs4_to_lower(character);
 302
 303   for (node = glob_hash_node; node && character >= node->character; node = node->next)
 304     {
 305       if (character == node->character)
 306         {
 307           file_name = _xdg_utf8_next_char (file_name);
 308           if (*file_name == '\000')
 309             {
 310               n = 0;
 311
 312               if (node->mime_type != NULL)
 313                 mime_types[n++] = node->mime_type;
 314
 315               node = node->child;
 316               while (n < n_mime_types && node && node->character == 0)
 317                 {
 318                   if (node->mime_type != NULL)
 319                     mime_types[n++] = node->mime_type;
 320
 321                   node = node->next;
 322                 }
 323             }
 324           else
 325             {
 326               n = _xdg_glob_hash_node_lookup_file_name (node->child,
 327                                                         file_name,
 328                                                         ignore_case,
 329                                                         mime_types,
 330                                                         n_mime_types);
 331             }
 332           return n;
 333         }
 334     }
 335
 336   return 0;
 337 }
 338
 339 int
 340 _xdg_glob_hash_lookup_file_name (XdgGlobHash *glob_hash,
 341                                  const char  *file_name,
 342                                  const char  *mime_types[],
 343                                  int          n_mime_types)
 344 {
 345   XdgGlobList *list;
 346   const char *ptr;
 347   char stopchars[128];
 348   int i, n;
 349   XdgGlobHashNode *node;
 350
 351   /* First, check the literals */
 352
 353   assert (file_name != NULL && n_mime_types > 0);
 354
 355   for (list = glob_hash->literal_list; list; list = list->next)
 356     {
 357       if (strcmp ((const char *)list->data, file_name) == 0)
 358         {
 359           mime_types[0] = list->mime_type;
 360           return 1;
 361         }
 362     }
 363
 364   i = 0;
 365   for (node = glob_hash->simple_node; node; node = node->next)
 366     {
 367       if (node->character < 128)
 368         stopchars[i++] = (char)node->character;
 369     }
 370   stopchars[i] = '\0';
 371
 372   ptr = strpbrk (file_name, stopchars);
 373   while (ptr)
 374     {
 375       n = _xdg_glob_hash_node_lookup_file_name (glob_hash->simple_node, ptr, FALSE,
 376                                                 mime_types, n_mime_types);
 377       if (n > 0)
 378         return n;
 379
 380       n = _xdg_glob_hash_node_lookup_file_name (glob_hash->simple_node, ptr, TRUE,
 381                                                 mime_types, n_mime_types);
 382       if (n > 0)
 383         return n;
 384
 385       ptr = strpbrk (ptr + 1, stopchars);
 386     }
 387
 388   /* FIXME: Not UTF-8 safe */
 389   n = 0;
 390   for (list = glob_hash->full_list; list && n < n_mime_types; list = list->next)
 391     {
 392       if (fnmatch ((const char *)list->data, file_name, 0) == 0)
 393         mime_types[n++] = list->mime_type;
 394     }
 395
 396   return n;
 397 }
 398
 399
 400
 401 /* XdgGlobHash
 402  */
 403
 404 XdgGlobHash *
 405 _xdg_glob_hash_new (void)
 406 {
 407   XdgGlobHash *glob_hash;
 408
 409   glob_hash = calloc (1, sizeof (XdgGlobHash));
 410
 411   return glob_hash;
 412 }
 413
 414
 415 static void
 416 _xdg_glob_hash_free_nodes (XdgGlobHashNode *node)
 417 {
 418   if (node)
 419     {
 420       if (node->child)
 421        _xdg_glob_hash_free_nodes (node->child);
 422       if (node->next)
 423        _xdg_glob_hash_free_nodes (node->next);
 424       if (node->mime_type)
 425         free ((void *) node->mime_type);
 426       free (node);
 427     }
 428 }
 429
 430 void
 431 _xdg_glob_hash_free (XdgGlobHash *glob_hash)
 432 {
 433   _xdg_glob_list_free (glob_hash->literal_list);
 434   _xdg_glob_list_free (glob_hash->full_list);
 435   _xdg_glob_hash_free_nodes (glob_hash->simple_node);
 436   free (glob_hash);
 437 }
 438
 439 XdgGlobType
 440 _xdg_glob_determine_type (const char *glob)
 441 {
 442   const char *ptr;
 443   int maybe_in_simple_glob = FALSE;
 444   int first_char = TRUE;
 445
 446   ptr = glob;
 447
 448   while (*ptr != '\000')
 449     {
 450       if (*ptr == '*' && first_char)
 451         maybe_in_simple_glob = TRUE;
 452       else if (*ptr == '\\' || *ptr == '[' || *ptr == '?' || *ptr == '*')
 453           return XDG_GLOB_FULL;
 454
 455       first_char = FALSE;
 456       ptr = _xdg_utf8_next_char (ptr);
 457     }
 458   if (maybe_in_simple_glob)
 459     return XDG_GLOB_SIMPLE;
 460   else
 461     return XDG_GLOB_LITERAL;
 462 }
 463
 464 /* glob must be valid UTF-8 */
 465 void
 466 _xdg_glob_hash_append_glob (XdgGlobHash *glob_hash,
 467                             const char  *glob,
 468                             const char  *mime_type)
 469 {
 470   XdgGlobType type;
 471
 472   assert (glob_hash != NULL);
 473   assert (glob != NULL);
 474
 475   type = _xdg_glob_determine_type (glob);
 476
 477   switch (type)
 478     {
 479     case XDG_GLOB_LITERAL:
 480       glob_hash->literal_list = _xdg_glob_list_append (glob_hash->literal_list, strdup (glob), strdup (mime_type));
 481       break;
 482     case XDG_GLOB_SIMPLE:
 483       glob_hash->simple_node = _xdg_glob_hash_insert_text (glob_hash->simple_node, glob + 1, mime_type);
 484       break;
 485     case XDG_GLOB_FULL:
 486       glob_hash->full_list = _xdg_glob_list_append (glob_hash->full_list, strdup (glob), strdup (mime_type));
 487       break;
 488     }
 489 }
 490
 491 void
 492 _xdg_glob_hash_dump (XdgGlobHash *glob_hash)
 493 {
 494   XdgGlobList *list;
 495   printf ("LITERAL STRINGS\n");
 496   if (glob_hash->literal_list == NULL)
 497     {
 498       printf ("    None\n");
 499     }
 500   else
 501     {
 502       for (list = glob_hash->literal_list; list; list = list->next)
 503         printf ("    %s - %s\n", (char *)list->data, list->mime_type);
 504     }
 505   printf ("\nSIMPLE GLOBS\n");
 506   _xdg_glob_hash_node_dump (glob_hash->simple_node, 4);
 507
 508   printf ("\nFULL GLOBS\n");
 509   if (glob_hash->full_list == NULL)
 510     {
 511       printf ("    None\n");
 512     }
 513   else
 514     {
 515       for (list = glob_hash->full_list; list; list = list->next)
 516         printf ("    %s - %s\n", (char *)list->data, list->mime_type);
 517     }
 518 }
 519
 520
 521 void
 522 _xdg_mime_glob_read_from_file (XdgGlobHash *glob_hash,
 523                                const char  *file_name)
 524 {
 525   FILE *glob_file;
 526   char line[255];
 527
 528   glob_file = fopen (file_name, "r");
 529
 530   if (glob_file == NULL)
 531     return;
 532
 533   /* FIXME: Not UTF-8 safe.  Doesn't work if lines are greater than 255 chars.
 534    * Blah */
 535   while (fgets (line, 255, glob_file) != NULL)
 536     {
 537       char *colon;
 538       if (line[0] == '#')
 539         continue;
 540
 541       colon = strchr (line, ':');
 542       if (colon == NULL)
 543         continue;
 544       *(colon++) = '\000';
 545       colon[strlen (colon) -1] = '\000';
 546       _xdg_glob_hash_append_glob (glob_hash, colon, line);
 547     }
 548
 549   fclose (glob_file);
 550 }