File: gtkiconcache.c

package info (click to toggle)
gtk+2.0 2.24.32-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 128,080 kB
  • sloc: ansic: 574,621; makefile: 5,197; sh: 4,500; xml: 1,193; python: 1,119; perl: 749; awk: 72; cpp: 34
file content (570 lines) | stat: -rw-r--r-- 13,678 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
/* gtkiconcache.c
 * Copyright (C) 2004  Anders Carlsson <andersca@gnome.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include "gtkdebug.h"
#include "gtkiconcache.h"
#include "gtkiconcachevalidator.h"
#include "gtkalias.h"

#include <glib/gstdio.h>

#undef GDK_PIXBUF_DISABLE_DEPRECATED
#include <gdk-pixbuf/gdk-pixdata.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef G_OS_WIN32
#include <io.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>


#ifndef _O_BINARY
#define _O_BINARY 0
#endif

#define MAJOR_VERSION 1
#define MINOR_VERSION 0

#define GET_UINT16(cache, offset) (GUINT16_FROM_BE (*(guint16 *)((cache) + (offset))))
#define GET_UINT32(cache, offset) (GUINT32_FROM_BE (*(guint32 *)((cache) + (offset))))


struct _GtkIconCache {
  gint ref_count;

  GMappedFile *map;
  gchar *buffer;

  guint32 last_chain_offset;
};

GtkIconCache *
_gtk_icon_cache_ref (GtkIconCache *cache)
{
  cache->ref_count++;
  return cache;
}

void
_gtk_icon_cache_unref (GtkIconCache *cache)
{
  cache->ref_count --;

  if (cache->ref_count == 0)
    {
      GTK_NOTE (ICONTHEME, 
		g_print ("unmapping icon cache\n"));

      if (cache->map)
	g_mapped_file_unref (cache->map);
      g_free (cache);
    }
}

GtkIconCache *
_gtk_icon_cache_new_for_path (const gchar *path)
{
  GtkIconCache *cache = NULL;
  GMappedFile *map;

  gchar *cache_filename;
  gint fd = -1;
  GStatBuf st;
  GStatBuf path_st;
  CacheInfo info;

   /* Check if we have a cache file */
  cache_filename = g_build_filename (path, "icon-theme.cache", NULL);

  GTK_NOTE (ICONTHEME, 
	    g_print ("look for cache in %s\n", path));

  if (g_stat (path, &path_st) < 0)
    goto done;

  /* Open the file and map it into memory */
  fd = g_open (cache_filename, O_RDONLY|_O_BINARY, 0);

  if (fd < 0)
    goto done;
  
  if (fstat (fd, &st) < 0 || st.st_size < 4)
    goto done;

  /* Verify cache is uptodate */
  if (st.st_mtime < path_st.st_mtime)
    {
      GTK_NOTE (ICONTHEME, 
		g_print ("cache outdated\n"));
      goto done; 
    }

  map = g_mapped_file_new (cache_filename, FALSE, NULL);

  if (!map)
    goto done;

  info.cache = g_mapped_file_get_contents (map);
  info.cache_size = g_mapped_file_get_length (map);
  info.n_directories = 0;
  info.flags = CHECK_OFFSETS|CHECK_STRINGS;

#ifdef G_ENABLE_DEBUG
  if (gtk_debug_flags & GTK_DEBUG_ICONTHEME)
    {
      if (!_gtk_icon_cache_validate (&info))
        {
          g_mapped_file_unref (map);
          g_warning ("Icon cache '%s' is invalid\n", cache_filename);

          goto done;
        }
    }
#endif 

  GTK_NOTE (ICONTHEME, g_print ("found cache for %s\n", path));

  cache = g_new0 (GtkIconCache, 1);
  cache->ref_count = 1;
  cache->map = map;
  cache->buffer = g_mapped_file_get_contents (map);

 done:
  g_free (cache_filename);  
  if (fd >= 0)
    close (fd);

  return cache;
}

GtkIconCache *
_gtk_icon_cache_new (const gchar *data)
{
  GtkIconCache *cache;

  cache = g_new0 (GtkIconCache, 1);
  cache->ref_count = 1;
  cache->map = NULL;
  cache->buffer = (gchar *)data;
  
  return cache;
}

static gint
get_directory_index (GtkIconCache *cache,
		     const gchar *directory)
{
  guint32 dir_list_offset;
  gint n_dirs;
  gint i;
  
  dir_list_offset = GET_UINT32 (cache->buffer, 8);

  n_dirs = GET_UINT32 (cache->buffer, dir_list_offset);

  for (i = 0; i < n_dirs; i++)
    {
      guint32 name_offset = GET_UINT32 (cache->buffer, dir_list_offset + 4 + 4 * i);
      gchar *name = cache->buffer + name_offset;
      if (strcmp (name, directory) == 0)
	return i;
    }
  
  return -1;
}

gint
_gtk_icon_cache_get_directory_index (GtkIconCache *cache,
			             const gchar *directory)
{
  return get_directory_index (cache, directory);
}

static guint
icon_name_hash (gconstpointer key)
{
  const signed char *p = key;
  guint32 h = *p;

  if (h)
    for (p += 1; *p != '\0'; p++)
      h = (h << 5) - h + *p;

  return h;
}

static gint
find_image_offset (GtkIconCache *cache,
		   const gchar  *icon_name,
		   gint          directory_index)
{
  guint32 hash_offset;
  guint32 n_buckets;
  guint32 chain_offset;
  int hash;
  guint32 image_list_offset, n_images;
  int i;

  chain_offset = cache->last_chain_offset;
  if (chain_offset)
    {
      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
      gchar *name = cache->buffer + name_offset;

      if (strcmp (name, icon_name) == 0)
        goto find_dir;
    }

  hash_offset = GET_UINT32 (cache->buffer, 4);
  n_buckets = GET_UINT32 (cache->buffer, hash_offset);
  hash = icon_name_hash (icon_name) % n_buckets;

  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
  while (chain_offset != 0xffffffff)
    {
      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
      gchar *name = cache->buffer + name_offset;

      if (strcmp (name, icon_name) == 0)
        {
          cache->last_chain_offset = chain_offset;
          goto find_dir;
	}
  
      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
    }

  cache->last_chain_offset = 0;
  return 0;

find_dir:
  /* We've found an icon list, now check if we have the right icon in it */
  image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
  n_images = GET_UINT32 (cache->buffer, image_list_offset);
  
  for (i = 0; i < n_images; i++)
    {
      if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * i) ==
	  directory_index) 
	return image_list_offset + 4 + 8 * i;
    }

  return 0;
}

gint
_gtk_icon_cache_get_icon_flags (GtkIconCache *cache,
				const gchar  *icon_name,
				gint          directory_index)
{
  guint32 image_offset;

  image_offset = find_image_offset (cache, icon_name, directory_index);

  if (!image_offset)
    return 0;

  return GET_UINT16 (cache->buffer, image_offset + 2);
}

void
_gtk_icon_cache_add_icons (GtkIconCache *cache,
			   const gchar  *directory,
			   GHashTable   *hash_table)
{
  int directory_index;
  guint32 hash_offset, n_buckets;
  guint32 chain_offset;
  guint32 image_list_offset, n_images;
  int i, j;
  
  directory_index = get_directory_index (cache, directory);

  if (directory_index == -1)
    return;
  
  hash_offset = GET_UINT32 (cache->buffer, 4);
  n_buckets = GET_UINT32 (cache->buffer, hash_offset);

  for (i = 0; i < n_buckets; i++)
    {
      chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * i);
      while (chain_offset != 0xffffffff)
	{
	  guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
	  gchar *name = cache->buffer + name_offset;
	  
	  image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
	  n_images = GET_UINT32 (cache->buffer, image_list_offset);
  
	  for (j = 0; j < n_images; j++)
	    {
	      if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * j) ==
		  directory_index)
		g_hash_table_insert (hash_table, name, NULL);
	    }

	  chain_offset = GET_UINT32 (cache->buffer, chain_offset);
	}
    }  
}

gboolean
_gtk_icon_cache_has_icon (GtkIconCache *cache,
			  const gchar  *icon_name)
{
  guint32 hash_offset;
  guint32 n_buckets;
  guint32 chain_offset;
  gint hash;
  
  hash_offset = GET_UINT32 (cache->buffer, 4);
  n_buckets = GET_UINT32 (cache->buffer, hash_offset);

  hash = icon_name_hash (icon_name) % n_buckets;

  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
  while (chain_offset != 0xffffffff)
    {
      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
      gchar *name = cache->buffer + name_offset;

      if (strcmp (name, icon_name) == 0)
	return TRUE;
	  
      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
    }

  return FALSE;
}

gboolean
_gtk_icon_cache_has_icon_in_directory (GtkIconCache *cache,
				       const gchar  *icon_name,
				       const gchar  *directory)
{
  guint32 hash_offset;
  guint32 n_buckets;
  guint32 chain_offset;
  gint hash;
  gboolean found_icon = FALSE;
  gint directory_index;

  directory_index = get_directory_index (cache, directory);

  if (directory_index == -1)
    return FALSE;
  
  hash_offset = GET_UINT32 (cache->buffer, 4);
  n_buckets = GET_UINT32 (cache->buffer, hash_offset);

  hash = icon_name_hash (icon_name) % n_buckets;

  chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash);
  while (chain_offset != 0xffffffff)
    {
      guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4);
      gchar *name = cache->buffer + name_offset;

      if (strcmp (name, icon_name) == 0)
	{
	  found_icon = TRUE;
	  break;
	}
	  
      chain_offset = GET_UINT32 (cache->buffer, chain_offset);
    }

  if (found_icon)
    {
      guint32 image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8);
      guint32 n_images =  GET_UINT32 (cache->buffer, image_list_offset);
      guint32 image_offset = image_list_offset + 4;
      gint i;
      for (i = 0; i < n_images; i++)
	{
	  guint16 index = GET_UINT16 (cache->buffer, image_offset);
	  
	  if (index == directory_index)
	    return TRUE;
	  image_offset += 8;
	}
    }

  return FALSE;
}

static void
pixbuf_destroy_cb (guchar   *pixels, 
		   gpointer  data)
{
  GtkIconCache *cache = data;

  _gtk_icon_cache_unref (cache);
}

GdkPixbuf *
_gtk_icon_cache_get_icon (GtkIconCache *cache,
			  const gchar  *icon_name,
			  gint          directory_index)
{
  guint32 offset, image_data_offset, pixel_data_offset;
  guint32 length, type;
  GdkPixbuf *pixbuf;
  GdkPixdata pixdata;
  GError *error = NULL;

  offset = find_image_offset (cache, icon_name, directory_index);
  
  image_data_offset = GET_UINT32 (cache->buffer, offset + 4);
  
  if (!image_data_offset)
    return NULL;

  pixel_data_offset = GET_UINT32 (cache->buffer, image_data_offset);

  type = GET_UINT32 (cache->buffer, pixel_data_offset);

  if (type != 0)
    {
      GTK_NOTE (ICONTHEME,
		g_print ("invalid pixel data type %u\n", type));
      return NULL;
    }

  length = GET_UINT32 (cache->buffer, pixel_data_offset + 4);
  
  if (!gdk_pixdata_deserialize (&pixdata, length, 
				(guchar *)(cache->buffer + pixel_data_offset + 8),
				&error))
    {
      GTK_NOTE (ICONTHEME,
		g_print ("could not deserialize data: %s\n", error->message));
      g_error_free (error);

      return NULL;
    }

  pixbuf = gdk_pixbuf_new_from_data (pixdata.pixel_data, GDK_COLORSPACE_RGB,
				     (pixdata.pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA,
				     8, pixdata.width, pixdata.height, pixdata.rowstride,
				     (GdkPixbufDestroyNotify)pixbuf_destroy_cb, 
				     cache);
  if (!pixbuf)
    {
      GTK_NOTE (ICONTHEME,
		g_print ("could not convert pixdata to pixbuf: %s\n", error->message));
      g_error_free (error);

      return NULL;
    }

  _gtk_icon_cache_ref (cache);

  return pixbuf;
}

GtkIconData  *
_gtk_icon_cache_get_icon_data  (GtkIconCache *cache,
				const gchar  *icon_name,
				gint          directory_index)
{
  guint32 offset, image_data_offset, meta_data_offset;
  GtkIconData *data;
  int i;

  offset = find_image_offset (cache, icon_name, directory_index);
  if (!offset)
    return NULL;

  image_data_offset = GET_UINT32 (cache->buffer, offset + 4);
  if (!image_data_offset)
    return NULL;

  meta_data_offset = GET_UINT32 (cache->buffer, image_data_offset + 4);
  
  if (!meta_data_offset)
    return NULL;

  data = g_slice_new0 (GtkIconData);

  offset = GET_UINT32 (cache->buffer, meta_data_offset);
  if (offset)
    {
      data->has_embedded_rect = TRUE;
      data->x0 = GET_UINT16 (cache->buffer, offset);
      data->y0 = GET_UINT16 (cache->buffer, offset + 2);
      data->x1 = GET_UINT16 (cache->buffer, offset + 4);
      data->y1 = GET_UINT16 (cache->buffer, offset + 6);
    }

  offset = GET_UINT32 (cache->buffer, meta_data_offset + 4);
  if (offset)
    {
      data->n_attach_points = GET_UINT32 (cache->buffer, offset);
      data->attach_points = g_new (GdkPoint, data->n_attach_points);
      for (i = 0; i < data->n_attach_points; i++)
	{
	  data->attach_points[i].x = GET_UINT16 (cache->buffer, offset + 4 + 4 * i); 
	  data->attach_points[i].y = GET_UINT16 (cache->buffer, offset + 4 + 4 * i + 2); 
	}
    }

  offset = GET_UINT32 (cache->buffer, meta_data_offset + 8);
  if (offset)
    {
      gint n_names;
      gchar *lang, *name;
      gchar **langs;
      GHashTable *table = g_hash_table_new (g_str_hash, g_str_equal);

      n_names = GET_UINT32 (cache->buffer, offset);
      
      for (i = 0; i < n_names; i++)
	{
	  lang = cache->buffer + GET_UINT32 (cache->buffer, offset + 4 + 8 * i);
	  name = cache->buffer + GET_UINT32 (cache->buffer, offset + 4 + 8 * i + 4);
	  
	  g_hash_table_insert (table, lang, name);
	}
      
      langs = (gchar **)g_get_language_names ();
      for (i = 0; langs[i]; i++)
	{
	  name = g_hash_table_lookup (table, langs[i]);
	  if (name)
	    {
	      data->display_name = g_strdup (name);
	      break;
	    }
	}

      g_hash_table_destroy (table);
    }

  return data;
}