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1 office 1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2006-2007 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Alexander Larsson <alexl@redhat.com>
19 */
20  
21 #include "config.h"
22 #include <stdlib.h>
23 #include <string.h>
24  
25 #include "gicon.h"
26 #include "gthemedicon.h"
27 #include "gfileicon.h"
28 #include "gemblemedicon.h"
29 #include "gbytesicon.h"
30 #include "gfile.h"
31 #include "gioerror.h"
32 #include "gioenumtypes.h"
33 #include "gvfs.h"
34  
35 #include "glibintl.h"
36  
37  
38 /* There versioning of this is implicit, version 1 would be ".1 " */
39 #define G_ICON_SERIALIZATION_MAGIC0 ". "
40  
41 /**
42 * SECTION:gicon
43 * @short_description: Interface for icons
44 * @include: gio/gio.h
45 *
46 * #GIcon is a very minimal interface for icons. It provides functions
47 * for checking the equality of two icons, hashing of icons and
48 * serializing an icon to and from strings.
49 *
50 * #GIcon does not provide the actual pixmap for the icon as this is out
51 * of GIO's scope, however implementations of #GIcon may contain the name
52 * of an icon (see #GThemedIcon), or the path to an icon (see #GLoadableIcon).
53 *
54 * To obtain a hash of a #GIcon, see g_icon_hash().
55 *
56 * To check if two #GIcons are equal, see g_icon_equal().
57 *
58 * For serializing a #GIcon, use g_icon_serialize() and
59 * g_icon_deserialize().
60 *
61 * If you want to consume #GIcon (for example, in a toolkit) you must
62 * be prepared to handle at least the three following cases:
63 * #GLoadableIcon, #GThemedIcon and #GEmblemedIcon. It may also make
64 * sense to have fast-paths for other cases (like handling #GdkPixbuf
65 * directly, for example) but all compliant #GIcon implementations
66 * outside of GIO must implement #GLoadableIcon.
67 *
68 * If your application or library provides one or more #GIcon
69 * implementations you need to ensure that your new implementation also
70 * implements #GLoadableIcon. Additionally, you must provide an
71 * implementation of g_icon_serialize() that gives a result that is
72 * understood by g_icon_deserialize(), yielding one of the built-in icon
73 * types.
74 **/
75  
76 typedef GIconIface GIconInterface;
77 G_DEFINE_INTERFACE(GIcon, g_icon, G_TYPE_OBJECT)
78  
79 static void
80 g_icon_default_init (GIconInterface *iface)
81 {
82 }
83  
84 /**
85 * g_icon_hash:
86 * @icon: (not nullable): #gconstpointer to an icon object.
87 *
88 * Gets a hash for an icon.
89 *
90 * Virtual: hash
91 * Returns: a #guint containing a hash for the @icon, suitable for
92 * use in a #GHashTable or similar data structure.
93 **/
94 guint
95 g_icon_hash (gconstpointer icon)
96 {
97 GIconIface *iface;
98  
99 g_return_val_if_fail (G_IS_ICON (icon), 0);
100  
101 iface = G_ICON_GET_IFACE (icon);
102  
103 return (* iface->hash) ((GIcon *)icon);
104 }
105  
106 /**
107 * g_icon_equal:
108 * @icon1: (allow-none): pointer to the first #GIcon.
109 * @icon2: (allow-none): pointer to the second #GIcon.
110 *
111 * Checks if two icons are equal.
112 *
113 * Returns: %TRUE if @icon1 is equal to @icon2. %FALSE otherwise.
114 **/
115 gboolean
116 g_icon_equal (GIcon *icon1,
117 GIcon *icon2)
118 {
119 GIconIface *iface;
120  
121 if (icon1 == NULL && icon2 == NULL)
122 return TRUE;
123  
124 if (icon1 == NULL || icon2 == NULL)
125 return FALSE;
126  
127 if (G_TYPE_FROM_INSTANCE (icon1) != G_TYPE_FROM_INSTANCE (icon2))
128 return FALSE;
129  
130 iface = G_ICON_GET_IFACE (icon1);
131  
132 return (* iface->equal) (icon1, icon2);
133 }
134  
135 static gboolean
136 g_icon_to_string_tokenized (GIcon *icon, GString *s)
137 {
138 GPtrArray *tokens;
139 gint version;
140 GIconIface *icon_iface;
141 int i;
142  
143 g_return_val_if_fail (icon != NULL, FALSE);
144 g_return_val_if_fail (G_IS_ICON (icon), FALSE);
145  
146 icon_iface = G_ICON_GET_IFACE (icon);
147 if (icon_iface->to_tokens == NULL)
148 return FALSE;
149  
150 tokens = g_ptr_array_new ();
151 if (!icon_iface->to_tokens (icon, tokens, &version))
152 {
153 g_ptr_array_free (tokens, TRUE);
154 return FALSE;
155 }
156  
157 /* format: TypeName[.Version] <token_0> .. <token_N-1>
158 version 0 is implicit and can be omitted
159 all the tokens are url escaped to ensure they have no spaces in them */
160  
161 g_string_append (s, g_type_name_from_instance ((GTypeInstance *)icon));
162 if (version != 0)
163 g_string_append_printf (s, ".%d", version);
164  
165 for (i = 0; i < tokens->len; i++)
166 {
167 char *token;
168  
169 token = g_ptr_array_index (tokens, i);
170  
171 g_string_append_c (s, ' ');
172 /* We really only need to escape spaces here, so allow lots of otherwise reserved chars */
173 g_string_append_uri_escaped (s, token,
174 G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, TRUE);
175  
176 g_free (token);
177 }
178  
179 g_ptr_array_free (tokens, TRUE);
180  
181 return TRUE;
182 }
183  
184 /**
185 * g_icon_to_string:
186 * @icon: a #GIcon.
187 *
188 * Generates a textual representation of @icon that can be used for
189 * serialization such as when passing @icon to a different process or
190 * saving it to persistent storage. Use g_icon_new_for_string() to
191 * get @icon back from the returned string.
192 *
193 * The encoding of the returned string is proprietary to #GIcon except
194 * in the following two cases
195 *
196 * - If @icon is a #GFileIcon, the returned string is a native path
197 * (such as `/path/to/my icon.png`) without escaping
198 * if the #GFile for @icon is a native file. If the file is not
199 * native, the returned string is the result of g_file_get_uri()
200 * (such as `sftp://path/to/my%20icon.png`).
201 *
202 * - If @icon is a #GThemedIcon with exactly one name, the encoding is
203 * simply the name (such as `network-server`).
204 *
205 * Virtual: to_tokens
206 * Returns: (nullable): An allocated NUL-terminated UTF8 string or
207 * %NULL if @icon can't be serialized. Use g_free() to free.
208 *
209 * Since: 2.20
210 */
211 gchar *
212 g_icon_to_string (GIcon *icon)
213 {
214 gchar *ret;
215  
216 g_return_val_if_fail (icon != NULL, NULL);
217 g_return_val_if_fail (G_IS_ICON (icon), NULL);
218  
219 ret = NULL;
220  
221 if (G_IS_FILE_ICON (icon))
222 {
223 GFile *file;
224  
225 file = g_file_icon_get_file (G_FILE_ICON (icon));
226 if (g_file_is_native (file))
227 {
228 ret = g_file_get_path (file);
229 if (!g_utf8_validate (ret, -1, NULL))
230 {
231 g_free (ret);
232 ret = NULL;
233 }
234 }
235 else
236 ret = g_file_get_uri (file);
237 }
238 else if (G_IS_THEMED_ICON (icon))
239 {
240 const char * const *names;
241  
242 names = g_themed_icon_get_names (G_THEMED_ICON (icon));
243 if (names != NULL &&
244 names[0] != NULL &&
245 names[0][0] != '.' && /* Allowing icons starting with dot would break G_ICON_SERIALIZATION_MAGIC0 */
246 g_utf8_validate (names[0], -1, NULL) && /* Only return utf8 strings */
247 names[1] == NULL)
248 ret = g_strdup (names[0]);
249 }
250  
251 if (ret == NULL)
252 {
253 GString *s;
254  
255 s = g_string_new (G_ICON_SERIALIZATION_MAGIC0);
256  
257 if (g_icon_to_string_tokenized (icon, s))
258 ret = g_string_free (s, FALSE);
259 else
260 g_string_free (s, TRUE);
261 }
262  
263 return ret;
264 }
265  
266 static GIcon *
267 g_icon_new_from_tokens (char **tokens,
268 GError **error)
269 {
270 GIcon *icon;
271 char *typename, *version_str;
272 GType type;
273 gpointer klass;
274 GIconIface *icon_iface;
275 gint version;
276 char *endp;
277 int num_tokens;
278 int i;
279  
280 icon = NULL;
281 klass = NULL;
282  
283 num_tokens = g_strv_length (tokens);
284  
285 if (num_tokens < 1)
286 {
287 g_set_error (error,
288 G_IO_ERROR,
289 G_IO_ERROR_INVALID_ARGUMENT,
290 _("Wrong number of tokens (%d)"),
291 num_tokens);
292 goto out;
293 }
294  
295 typename = tokens[0];
296 version_str = strchr (typename, '.');
297 if (version_str)
298 {
299 *version_str = 0;
300 version_str += 1;
301 }
302  
303  
304 type = g_type_from_name (tokens[0]);
305 if (type == 0)
306 {
307 g_set_error (error,
308 G_IO_ERROR,
309 G_IO_ERROR_INVALID_ARGUMENT,
310 _("No type for class name %s"),
311 tokens[0]);
312 goto out;
313 }
314  
315 if (!g_type_is_a (type, G_TYPE_ICON))
316 {
317 g_set_error (error,
318 G_IO_ERROR,
319 G_IO_ERROR_INVALID_ARGUMENT,
320 _("Type %s does not implement the GIcon interface"),
321 tokens[0]);
322 goto out;
323 }
324  
325 klass = g_type_class_ref (type);
326 if (klass == NULL)
327 {
328 g_set_error (error,
329 G_IO_ERROR,
330 G_IO_ERROR_INVALID_ARGUMENT,
331 _("Type %s is not classed"),
332 tokens[0]);
333 goto out;
334 }
335  
336 version = 0;
337 if (version_str)
338 {
339 version = strtol (version_str, &endp, 10);
340 if (endp == NULL || *endp != '\0')
341 {
342 g_set_error (error,
343 G_IO_ERROR,
344 G_IO_ERROR_INVALID_ARGUMENT,
345 _("Malformed version number: %s"),
346 version_str);
347 goto out;
348 }
349 }
350  
351 icon_iface = g_type_interface_peek (klass, G_TYPE_ICON);
352 g_assert (icon_iface != NULL);
353  
354 if (icon_iface->from_tokens == NULL)
355 {
356 g_set_error (error,
357 G_IO_ERROR,
358 G_IO_ERROR_INVALID_ARGUMENT,
359 _("Type %s does not implement from_tokens() on the GIcon interface"),
360 tokens[0]);
361 goto out;
362 }
363  
364 for (i = 1; i < num_tokens; i++)
365 {
366 char *escaped;
367  
368 escaped = tokens[i];
369 tokens[i] = g_uri_unescape_string (escaped, NULL);
370 g_free (escaped);
371 }
372  
373 icon = icon_iface->from_tokens (tokens + 1, num_tokens - 1, version, error);
374  
375 out:
376 if (klass != NULL)
377 g_type_class_unref (klass);
378 return icon;
379 }
380  
381 static void
382 ensure_builtin_icon_types (void)
383 {
384 g_type_ensure (G_TYPE_THEMED_ICON);
385 g_type_ensure (G_TYPE_FILE_ICON);
386 g_type_ensure (G_TYPE_EMBLEMED_ICON);
387 g_type_ensure (G_TYPE_EMBLEM);
388 }
389  
390 /* handles the 'simple' cases: GFileIcon and GThemedIcon */
391 static GIcon *
392 g_icon_new_for_string_simple (const gchar *str)
393 {
394 gchar *scheme;
395 GIcon *icon;
396  
397 if (str[0] == '.')
398 return NULL;
399  
400 /* handle special GFileIcon and GThemedIcon cases */
401 scheme = g_uri_parse_scheme (str);
402 if (scheme != NULL || str[0] == '/' || str[0] == G_DIR_SEPARATOR)
403 {
404 GFile *location;
405 location = g_file_new_for_commandline_arg (str);
406 icon = g_file_icon_new (location);
407 g_object_unref (location);
408 }
409 else
410 icon = g_themed_icon_new (str);
411  
412 g_free (scheme);
413  
414 return icon;
415 }
416  
417 /**
418 * g_icon_new_for_string:
419 * @str: A string obtained via g_icon_to_string().
420 * @error: Return location for error.
421 *
422 * Generate a #GIcon instance from @str. This function can fail if
423 * @str is not valid - see g_icon_to_string() for discussion.
424 *
425 * If your application or library provides one or more #GIcon
426 * implementations you need to ensure that each #GType is registered
427 * with the type system prior to calling g_icon_new_for_string().
428 *
429 * Returns: (transfer full): An object implementing the #GIcon
430 * interface or %NULL if @error is set.
431 *
432 * Since: 2.20
433 **/
434 GIcon *
435 g_icon_new_for_string (const gchar *str,
436 GError **error)
437 {
438 GIcon *icon = NULL;
439  
440 g_return_val_if_fail (str != NULL, NULL);
441  
442 icon = g_icon_new_for_string_simple (str);
443 if (icon)
444 return icon;
445  
446 ensure_builtin_icon_types ();
447  
448 if (g_str_has_prefix (str, G_ICON_SERIALIZATION_MAGIC0))
449 {
450 gchar **tokens;
451  
452 /* handle tokenized encoding */
453 tokens = g_strsplit (str + sizeof (G_ICON_SERIALIZATION_MAGIC0) - 1, " ", 0);
454 icon = g_icon_new_from_tokens (tokens, error);
455 g_strfreev (tokens);
456 }
457 else
458 g_set_error_literal (error,
459 G_IO_ERROR,
460 G_IO_ERROR_INVALID_ARGUMENT,
461 _("Can't handle the supplied version of the icon encoding"));
462  
463 return icon;
464 }
465  
466 static GEmblem *
467 g_icon_deserialize_emblem (GVariant *value)
468 {
469 GVariant *emblem_metadata;
470 GVariant *emblem_data;
471 const gchar *origin_nick;
472 GIcon *emblem_icon;
473 GEmblem *emblem;
474  
475 g_variant_get (value, "(v@a{sv})", &emblem_data, &emblem_metadata);
476  
477 emblem = NULL;
478  
479 emblem_icon = g_icon_deserialize (emblem_data);
480 if (emblem_icon != NULL)
481 {
482 /* Check if we should create it with an origin. */
483 if (g_variant_lookup (emblem_metadata, "origin", "&s", &origin_nick))
484 {
485 GEnumClass *origin_class;
486 GEnumValue *origin_value;
487  
488 origin_class = g_type_class_ref (G_TYPE_EMBLEM_ORIGIN);
489 origin_value = g_enum_get_value_by_nick (origin_class, origin_nick);
490 if (origin_value)
491 emblem = g_emblem_new_with_origin (emblem_icon, origin_value->value);
492 g_type_class_unref (origin_class);
493 }
494  
495 /* We didn't create it with an origin, so do it without. */
496 if (emblem == NULL)
497 emblem = g_emblem_new (emblem_icon);
498  
499 g_object_unref (emblem_icon);
500 }
501  
502 g_variant_unref (emblem_metadata);
503 g_variant_unref (emblem_data);
504  
505 return emblem;
506 }
507  
508 static GIcon *
509 g_icon_deserialize_emblemed (GVariant *value)
510 {
511 GVariantIter *emblems;
512 GVariant *icon_data;
513 GIcon *main_icon;
514 GIcon *icon;
515  
516 g_variant_get (value, "(va(va{sv}))", &icon_data, &emblems);
517 main_icon = g_icon_deserialize (icon_data);
518  
519 if (main_icon)
520 {
521 GVariant *emblem_data;
522  
523 icon = g_emblemed_icon_new (main_icon, NULL);
524  
525 while ((emblem_data = g_variant_iter_next_value (emblems)))
526 {
527 GEmblem *emblem;
528  
529 emblem = g_icon_deserialize_emblem (emblem_data);
530  
531 if (emblem)
532 {
533 g_emblemed_icon_add_emblem (G_EMBLEMED_ICON (icon), emblem);
534 g_object_unref (emblem);
535 }
536  
537 g_variant_unref (emblem_data);
538 }
539  
540 g_object_unref (main_icon);
541 }
542 else
543 icon = NULL;
544  
545 g_variant_iter_free (emblems);
546 g_variant_unref (icon_data);
547  
548 return icon;
549 }
550  
551 /**
552 * g_icon_deserialize:
553 * @value: a #GVariant created with g_icon_serialize()
554 *
555 * Deserializes a #GIcon previously serialized using g_icon_serialize().
556 *
557 * Returns: (transfer full): a #GIcon, or %NULL when deserialization fails.
558 *
559 * Since: 2.38
560 */
561 GIcon *
562 g_icon_deserialize (GVariant *value)
563 {
564 const gchar *tag;
565 GVariant *val;
566 GIcon *icon;
567  
568 g_return_val_if_fail (value != NULL, NULL);
569 g_return_val_if_fail (g_variant_is_of_type (value, G_VARIANT_TYPE_STRING) ||
570 g_variant_is_of_type (value, G_VARIANT_TYPE ("(sv)")), NULL);
571  
572 /* Handle some special cases directly so that people can hard-code
573 * stuff into GMenuModel xml files without resorting to using GVariant
574 * text format to describe one of the explicitly-tagged possibilities
575 * below.
576 */
577 if (g_variant_is_of_type (value, G_VARIANT_TYPE_STRING))
578 return g_icon_new_for_string_simple (g_variant_get_string (value, NULL));
579  
580 /* Otherwise, use the tagged union format */
581 g_variant_get (value, "(&sv)", &tag, &val);
582  
583 icon = NULL;
584  
585 if (g_str_equal (tag, "file") && g_variant_is_of_type (val, G_VARIANT_TYPE_STRING))
586 {
587 GFile *file;
588  
589 file = g_file_new_for_commandline_arg (g_variant_get_string (val, NULL));
590 icon = g_file_icon_new (file);
591 g_object_unref (file);
592 }
593 else if (g_str_equal (tag, "themed") && g_variant_is_of_type (val, G_VARIANT_TYPE_STRING_ARRAY))
594 {
595 const gchar **names;
596 gsize size;
597  
598 names = g_variant_get_strv (val, &size);
599 icon = g_themed_icon_new_from_names ((gchar **) names, size);
600 g_free (names);
601 }
602 else if (g_str_equal (tag, "bytes") && g_variant_is_of_type (val, G_VARIANT_TYPE_BYTESTRING))
603 {
604 GBytes *bytes;
605  
606 bytes = g_variant_get_data_as_bytes (val);
607 icon = g_bytes_icon_new (bytes);
608 g_bytes_unref (bytes);
609 }
610 else if (g_str_equal (tag, "emblem") && g_variant_is_of_type (val, G_VARIANT_TYPE ("(va{sv})")))
611 {
612 GEmblem *emblem;
613  
614 emblem = g_icon_deserialize_emblem (val);
615 if (emblem)
616 icon = G_ICON (emblem);
617 }
618 else if (g_str_equal (tag, "emblemed") && g_variant_is_of_type (val, G_VARIANT_TYPE ("(va(va{sv}))")))
619 {
620 icon = g_icon_deserialize_emblemed (val);
621 }
622 else if (g_str_equal (tag, "gvfs"))
623 {
624 GVfsClass *class;
625 GVfs *vfs;
626  
627 vfs = g_vfs_get_default ();
628 class = G_VFS_GET_CLASS (vfs);
629 if (class->deserialize_icon)
630 icon = (* class->deserialize_icon) (vfs, val);
631 }
632  
633 g_variant_unref (val);
634  
635 return icon;
636 }
637  
638 /**
639 * g_icon_serialize:
640 * @icon: a #GIcon
641 *
642 * Serializes a #GIcon into a #GVariant. An equivalent #GIcon can be retrieved
643 * back by calling g_icon_deserialize() on the returned value.
644 * As serialization will avoid using raw icon data when possible, it only
645 * makes sense to transfer the #GVariant between processes on the same machine,
646 * (as opposed to over the network), and within the same file system namespace.
647 *
648 * Returns: (transfer full): a #GVariant, or %NULL when serialization fails.
649 *
650 * Since: 2.38
651 */
652 GVariant *
653 g_icon_serialize (GIcon *icon)
654 {
655 GIconInterface *iface;
656 GVariant *result;
657  
658 iface = G_ICON_GET_IFACE (icon);
659  
660 if (!iface->serialize)
661 {
662 g_critical ("g_icon_serialize() on icon type '%s' is not implemented", G_OBJECT_TYPE_NAME (icon));
663 return NULL;
664 }
665  
666 result = (* iface->serialize) (icon);
667  
668 if (result)
669 {
670 g_variant_take_ref (result);
671  
672 if (!g_variant_is_of_type (result, G_VARIANT_TYPE ("(sv)")))
673 {
674 g_critical ("g_icon_serialize() on icon type '%s' returned GVariant of type '%s' but it must return "
675 "one with type '(sv)'", G_OBJECT_TYPE_NAME (icon), g_variant_get_type_string (result));
676 g_variant_unref (result);
677 result = NULL;
678 }
679 }
680  
681 return result;
682 }