1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 2000-2001 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
25 #include "gtype-private.h"
27 #include "gvaluearray.h"
29 #include "gvaluecollector.h"
30 #include "gobjectalias.h"
35 * @short_description: A mechanism to wrap opaque C structures registered
37 * @see_also: #GParamSpecBoxed, g_param_spec_boxed()
40 * GBoxed is a generic wrapper mechanism for arbitrary C structures. The only
41 * thing the type system needs to know about the structures is how to copy and
42 * free them, beyond that they are treated as opaque chunks of memory.
44 * Boxed types are useful for simple value-holder structures like rectangles or
45 * points. They can also be used for wrapping structures defined in non-GObject
49 static inline void /* keep this function in sync with gvalue.c */
50 value_meminit (GValue *value,
53 value->g_type = value_type;
54 memset (value->data, 0, sizeof (value->data));
58 value_copy (gpointer boxed)
60 const GValue *src_value = boxed;
61 GValue *dest_value = g_new0 (GValue, 1);
63 if (G_VALUE_TYPE (src_value))
65 g_value_init (dest_value, G_VALUE_TYPE (src_value));
66 g_value_copy (src_value, dest_value);
72 value_free (gpointer boxed)
74 GValue *value = boxed;
76 if (G_VALUE_TYPE (value))
77 g_value_unset (value);
82 g_boxed_type_init (void)
84 static const GTypeInfo info = {
87 NULL, /* base_destroy */
88 NULL, /* class_init */
89 NULL, /* class_destroy */
90 NULL, /* class_data */
91 0, /* instance_size */
93 NULL, /* instance_init */
94 NULL, /* value_table */
96 const GTypeFundamentalInfo finfo = { G_TYPE_FLAG_DERIVABLE, };
101 type = g_type_register_fundamental (G_TYPE_BOXED, g_intern_static_string ("GBoxed"), &info, &finfo,
102 G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT);
103 g_assert (type == G_TYPE_BOXED);
107 g_closure_get_type (void)
109 static GType type_id = 0;
112 type_id = g_boxed_type_register_static (g_intern_static_string ("GClosure"),
113 (GBoxedCopyFunc) g_closure_ref,
114 (GBoxedFreeFunc) g_closure_unref);
119 g_value_get_type (void)
121 static GType type_id = 0;
124 type_id = g_boxed_type_register_static (g_intern_static_string ("GValue"),
131 g_value_array_get_type (void)
133 static GType type_id = 0;
136 type_id = g_boxed_type_register_static (g_intern_static_string ("GValueArray"),
137 (GBoxedCopyFunc) g_value_array_copy,
138 (GBoxedFreeFunc) g_value_array_free);
143 gdate_copy (gpointer boxed)
145 const GDate *date = (const GDate*) boxed;
147 return g_date_new_julian (g_date_get_julian (date));
151 g_date_get_type (void)
153 static GType type_id = 0;
156 type_id = g_boxed_type_register_static (g_intern_static_string ("GDate"),
157 (GBoxedCopyFunc) gdate_copy,
158 (GBoxedFreeFunc) g_date_free);
163 g_strv_get_type (void)
165 static GType type_id = 0;
168 type_id = g_boxed_type_register_static (g_intern_static_string ("GStrv"),
169 (GBoxedCopyFunc) g_strdupv,
170 (GBoxedFreeFunc) g_strfreev);
175 gstring_copy (gpointer boxed)
177 const GString *src_gstring = boxed;
179 return g_string_new_len (src_gstring->str, src_gstring->len);
183 gstring_free (gpointer boxed)
185 GString *gstring = boxed;
187 g_string_free (gstring, TRUE);
191 g_gstring_get_type (void)
193 static GType type_id = 0;
196 type_id = g_boxed_type_register_static (g_intern_static_string ("GString"),
197 /* the naming is a bit odd, but GString is obviously not G_TYPE_STRING */
204 hash_table_copy (gpointer boxed)
206 GHashTable *hash_table = boxed;
207 return g_hash_table_ref (hash_table);
211 hash_table_free (gpointer boxed)
213 GHashTable *hash_table = boxed;
214 g_hash_table_unref (hash_table);
218 g_hash_table_get_type (void)
220 static GType type_id = 0;
222 type_id = g_boxed_type_register_static (g_intern_static_string ("GHashTable"),
223 hash_table_copy, hash_table_free);
228 g_regex_get_type (void)
230 static GType type_id = 0;
234 type_id = g_boxed_type_register_static (g_intern_static_string ("GRegex"),
235 (GBoxedCopyFunc) g_regex_ref,
236 (GBoxedFreeFunc) g_regex_unref);
243 g_array_get_type (void)
245 static GType type_id = 0;
247 type_id = g_boxed_type_register_static (g_intern_static_string ("GArray"),
248 (GBoxedCopyFunc) g_array_ref,
249 (GBoxedFreeFunc) g_array_unref);
254 g_ptr_array_get_type (void)
256 static GType type_id = 0;
258 type_id = g_boxed_type_register_static (g_intern_static_string ("GPtrArray"),
259 (GBoxedCopyFunc) g_ptr_array_ref,
260 (GBoxedFreeFunc) g_ptr_array_unref);
265 g_byte_array_get_type (void)
267 static GType type_id = 0;
269 type_id = g_boxed_type_register_static (g_intern_static_string ("GByteArray"),
270 (GBoxedCopyFunc) g_byte_array_ref,
271 (GBoxedFreeFunc) g_byte_array_unref);
277 g_variant_type_get_gtype (void)
279 static GType type_id = 0;
282 type_id = g_boxed_type_register_static (g_intern_static_string ("GVariantType"),
283 (GBoxedCopyFunc) g_variant_type_copy,
284 (GBoxedFreeFunc) g_variant_type_free);
290 g_variant_get_gtype (void)
292 static GType type_id = 0;
295 type_id = g_boxed_type_register_static (g_intern_static_string ("GVariant"),
296 (GBoxedCopyFunc) g_variant_ref,
297 (GBoxedFreeFunc) g_variant_unref);
303 boxed_proxy_value_init (GValue *value)
305 value->data[0].v_pointer = NULL;
309 boxed_proxy_value_free (GValue *value)
311 if (value->data[0].v_pointer && !(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
312 _g_type_boxed_free (G_VALUE_TYPE (value), value->data[0].v_pointer);
316 boxed_proxy_value_copy (const GValue *src_value,
319 if (src_value->data[0].v_pointer)
320 dest_value->data[0].v_pointer = _g_type_boxed_copy (G_VALUE_TYPE (src_value), src_value->data[0].v_pointer);
322 dest_value->data[0].v_pointer = src_value->data[0].v_pointer;
326 boxed_proxy_value_peek_pointer (const GValue *value)
328 return value->data[0].v_pointer;
332 boxed_proxy_collect_value (GValue *value,
333 guint n_collect_values,
334 GTypeCValue *collect_values,
337 if (!collect_values[0].v_pointer)
338 value->data[0].v_pointer = NULL;
341 if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
343 value->data[0].v_pointer = collect_values[0].v_pointer;
344 value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
347 value->data[0].v_pointer = _g_type_boxed_copy (G_VALUE_TYPE (value), collect_values[0].v_pointer);
354 boxed_proxy_lcopy_value (const GValue *value,
355 guint n_collect_values,
356 GTypeCValue *collect_values,
359 gpointer *boxed_p = collect_values[0].v_pointer;
362 return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
364 if (!value->data[0].v_pointer)
366 else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
367 *boxed_p = value->data[0].v_pointer;
369 *boxed_p = _g_type_boxed_copy (G_VALUE_TYPE (value), value->data[0].v_pointer);
375 * g_boxed_type_register_static:
376 * @name: Name of the new boxed type.
377 * @boxed_copy: Boxed structure copy function.
378 * @boxed_free: Boxed structure free function.
380 * This function creates a new %G_TYPE_BOXED derived type id for a new
381 * boxed type with name @name. Boxed type handling functions have to be
382 * provided to copy and free opaque boxed structures of this type.
384 * Returns: New %G_TYPE_BOXED derived type id for @name.
387 g_boxed_type_register_static (const gchar *name,
388 GBoxedCopyFunc boxed_copy,
389 GBoxedFreeFunc boxed_free)
391 static const GTypeValueTable vtable = {
392 boxed_proxy_value_init,
393 boxed_proxy_value_free,
394 boxed_proxy_value_copy,
395 boxed_proxy_value_peek_pointer,
397 boxed_proxy_collect_value,
399 boxed_proxy_lcopy_value,
401 GTypeInfo type_info = {
403 NULL, /* base_init */
404 NULL, /* base_finalize */
405 NULL, /* class_init */
406 NULL, /* class_finalize */
407 NULL, /* class_data */
408 0, /* instance_size */
410 NULL, /* instance_init */
411 &vtable, /* value_table */
415 g_return_val_if_fail (name != NULL, 0);
416 g_return_val_if_fail (boxed_copy != NULL, 0);
417 g_return_val_if_fail (boxed_free != NULL, 0);
418 g_return_val_if_fail (g_type_from_name (name) == 0, 0);
420 type = g_type_register_static (G_TYPE_BOXED, name, &type_info, 0);
422 /* install proxy functions upon successfull registration */
424 _g_type_boxed_init (type, boxed_copy, boxed_free);
431 * @boxed_type: The type of @src_boxed.
432 * @src_boxed: The boxed structure to be copied.
434 * Provide a copy of a boxed structure @src_boxed which is of type @boxed_type.
436 * Returns: The newly created copy of the boxed structure.
439 g_boxed_copy (GType boxed_type,
440 gconstpointer src_boxed)
442 GTypeValueTable *value_table;
445 g_return_val_if_fail (G_TYPE_IS_BOXED (boxed_type), NULL);
446 g_return_val_if_fail (G_TYPE_IS_ABSTRACT (boxed_type) == FALSE, NULL);
447 g_return_val_if_fail (src_boxed != NULL, NULL);
449 value_table = g_type_value_table_peek (boxed_type);
451 g_return_val_if_fail (G_TYPE_IS_VALUE_TYPE (boxed_type), NULL);
453 /* check if our proxying implementation is used, we can short-cut here */
454 if (value_table->value_copy == boxed_proxy_value_copy)
455 dest_boxed = _g_type_boxed_copy (boxed_type, (gpointer) src_boxed);
458 GValue src_value, dest_value;
460 /* we heavily rely on third-party boxed type value vtable
461 * implementations to follow normal boxed value storage
462 * (data[0].v_pointer is the boxed struct, and
463 * data[1].v_uint holds the G_VALUE_NOCOPY_CONTENTS flag,
465 * but then, we can expect that since we layed out the
467 * data[1].v_uint&G_VALUE_NOCOPY_CONTENTS shouldn't be set
470 /* equiv. to g_value_set_static_boxed() */
471 value_meminit (&src_value, boxed_type);
472 src_value.data[0].v_pointer = (gpointer) src_boxed;
473 src_value.data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
475 /* call third-party code copy function, fingers-crossed */
476 value_meminit (&dest_value, boxed_type);
477 value_table->value_copy (&src_value, &dest_value);
479 /* double check and grouse if things went wrong */
480 if (dest_value.data[1].v_ulong)
481 g_warning ("the copy_value() implementation of type `%s' seems to make use of reserved GValue fields",
482 g_type_name (boxed_type));
484 dest_boxed = dest_value.data[0].v_pointer;
492 * @boxed_type: The type of @boxed.
493 * @boxed: The boxed structure to be freed.
495 * Free the boxed structure @boxed which is of type @boxed_type.
498 g_boxed_free (GType boxed_type,
501 GTypeValueTable *value_table;
503 g_return_if_fail (G_TYPE_IS_BOXED (boxed_type));
504 g_return_if_fail (G_TYPE_IS_ABSTRACT (boxed_type) == FALSE);
505 g_return_if_fail (boxed != NULL);
507 value_table = g_type_value_table_peek (boxed_type);
509 g_return_if_fail (G_TYPE_IS_VALUE_TYPE (boxed_type));
511 /* check if our proxying implementation is used, we can short-cut here */
512 if (value_table->value_free == boxed_proxy_value_free)
513 _g_type_boxed_free (boxed_type, boxed);
518 /* see g_boxed_copy() on why we think we can do this */
519 value_meminit (&value, boxed_type);
520 value.data[0].v_pointer = boxed;
521 value_table->value_free (&value);
527 * @value: a valid #GValue of %G_TYPE_BOXED derived type
529 * Get the contents of a %G_TYPE_BOXED derived #GValue.
531 * Returns: boxed contents of @value
534 g_value_get_boxed (const GValue *value)
536 g_return_val_if_fail (G_VALUE_HOLDS_BOXED (value), NULL);
537 g_return_val_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)), NULL);
539 return value->data[0].v_pointer;
544 * @value: a valid #GValue of %G_TYPE_BOXED derived type
546 * Get the contents of a %G_TYPE_BOXED derived #GValue. Upon getting,
547 * the boxed value is duplicated and needs to be later freed with
548 * g_boxed_free(), e.g. like: g_boxed_free (G_VALUE_TYPE (@value),
551 * Returns: boxed contents of @value
554 g_value_dup_boxed (const GValue *value)
556 g_return_val_if_fail (G_VALUE_HOLDS_BOXED (value), NULL);
557 g_return_val_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)), NULL);
559 return value->data[0].v_pointer ? g_boxed_copy (G_VALUE_TYPE (value), value->data[0].v_pointer) : NULL;
563 value_set_boxed_internal (GValue *value,
570 /* just resetting to NULL might not be desired, need to
571 * have value reinitialized also (for values defaulting
572 * to other default value states than a NULL data pointer),
573 * g_value_reset() will handle this
575 g_value_reset (value);
579 if (value->data[0].v_pointer && !(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
580 g_boxed_free (G_VALUE_TYPE (value), value->data[0].v_pointer);
581 value->data[1].v_uint = need_free ? 0 : G_VALUE_NOCOPY_CONTENTS;
582 value->data[0].v_pointer = need_copy ? g_boxed_copy (G_VALUE_TYPE (value), boxed) : (gpointer) boxed;
587 * @value: a valid #GValue of %G_TYPE_BOXED derived type
588 * @v_boxed: boxed value to be set
590 * Set the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed.
593 g_value_set_boxed (GValue *value,
596 g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
597 g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
599 value_set_boxed_internal (value, boxed, TRUE, TRUE);
603 * g_value_set_static_boxed:
604 * @value: a valid #GValue of %G_TYPE_BOXED derived type
605 * @v_boxed: static boxed value to be set
607 * Set the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed.
608 * The boxed value is assumed to be static, and is thus not duplicated
609 * when setting the #GValue.
612 g_value_set_static_boxed (GValue *value,
615 g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
616 g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
618 value_set_boxed_internal (value, boxed, FALSE, FALSE);
622 * g_value_set_boxed_take_ownership:
623 * @value: a valid #GValue of %G_TYPE_BOXED derived type
624 * @v_boxed: duplicated unowned boxed value to be set
626 * This is an internal function introduced mainly for C marshallers.
628 * Deprecated: 2.4: Use g_value_take_boxed() instead.
631 g_value_set_boxed_take_ownership (GValue *value,
634 g_value_take_boxed (value, boxed);
638 * g_value_take_boxed:
639 * @value: a valid #GValue of %G_TYPE_BOXED derived type
640 * @v_boxed: duplicated unowned boxed value to be set
642 * Sets the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed
643 * and takes over the ownership of the callers reference to @v_boxed;
644 * the caller doesn't have to unref it any more.
649 g_value_take_boxed (GValue *value,
652 g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
653 g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
655 value_set_boxed_internal (value, boxed, FALSE, TRUE);
658 #define __G_BOXED_C__
659 #include "gobjectaliasdef.c"