/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000-2001 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
/* for GValueArray */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include "gboxed.h"
#include "gclosure.h"
#include "gtype-private.h"
#include "gvalue.h"
#include "gvaluearray.h"
#include "gvaluecollector.h"
/**
* SECTION:gboxed
* @short_description: A mechanism to wrap opaque C structures registered
* by the type system
* @see_also: #GParamSpecBoxed, g_param_spec_boxed()
* @title: Boxed Types
*
* GBoxed is a generic wrapper mechanism for arbitrary C structures. The only
* thing the type system needs to know about the structures is how to copy and
* free them, beyond that they are treated as opaque chunks of memory.
*
* Boxed types are useful for simple value-holder structures like rectangles or
* points. They can also be used for wrapping structures defined in non-GObject
* based libraries.
*/
static inline void /* keep this function in sync with gvalue.c */
value_meminit (GValue *value,
GType value_type)
{
value->g_type = value_type;
memset (value->data, 0, sizeof (value->data));
}
static GValue *
value_copy (GValue *src_value)
{
GValue *dest_value = g_new0 (GValue, 1);
if (G_VALUE_TYPE (src_value))
{
g_value_init (dest_value, G_VALUE_TYPE (src_value));
g_value_copy (src_value, dest_value);
}
return dest_value;
}
static void
value_free (GValue *value)
{
if (G_VALUE_TYPE (value))
g_value_unset (value);
g_free (value);
}
static GPollFD *
pollfd_copy (GPollFD *src)
{
GPollFD *dest = g_new0 (GPollFD, 1);
/* just a couple of integers */
memcpy (dest, src, sizeof (GPollFD));
return dest;
}
void
_g_boxed_type_init (void)
{
const GTypeInfo info = {
0, /* class_size */
NULL, /* base_init */
NULL, /* base_destroy */
NULL, /* class_init */
NULL, /* class_destroy */
NULL, /* class_data */
0, /* instance_size */
0, /* n_preallocs */
NULL, /* instance_init */
NULL, /* value_table */
};
const GTypeFundamentalInfo finfo = { G_TYPE_FLAG_DERIVABLE, };
GType type;
/* G_TYPE_BOXED
*/
type = g_type_register_fundamental (G_TYPE_BOXED, g_intern_static_string ("GBoxed"), &info, &finfo,
G_TYPE_FLAG_ABSTRACT | G_TYPE_FLAG_VALUE_ABSTRACT);
g_assert (type == G_TYPE_BOXED);
}
static GString *
gstring_copy (GString *src_gstring)
{
return g_string_new_len (src_gstring->str, src_gstring->len);
}
static void
gstring_free (GString *gstring)
{
g_string_free (gstring, TRUE);
}
G_DEFINE_BOXED_TYPE (GClosure, g_closure, g_closure_ref, g_closure_unref)
G_DEFINE_BOXED_TYPE (GValue, g_value, value_copy, value_free)
G_DEFINE_BOXED_TYPE (GValueArray, g_value_array, g_value_array_copy, g_value_array_free)
G_DEFINE_BOXED_TYPE (GDate, g_date, g_date_copy, g_date_free)
/* the naming is a bit odd, but GString is obviously not G_TYPE_STRING */
G_DEFINE_BOXED_TYPE (GString, g_gstring, gstring_copy, gstring_free)
G_DEFINE_BOXED_TYPE (GHashTable, g_hash_table, g_hash_table_ref, g_hash_table_unref)
G_DEFINE_BOXED_TYPE (GArray, g_array, g_array_ref, g_array_unref)
G_DEFINE_BOXED_TYPE (GPtrArray, g_ptr_array,g_ptr_array_ref, g_ptr_array_unref)
G_DEFINE_BOXED_TYPE (GByteArray, g_byte_array, g_byte_array_ref, g_byte_array_unref)
G_DEFINE_BOXED_TYPE (GBytes, g_bytes, g_bytes_ref, g_bytes_unref)
G_DEFINE_BOXED_TYPE (GRegex, g_regex, g_regex_ref, g_regex_unref)
G_DEFINE_BOXED_TYPE (GMatchInfo, g_match_info, g_match_info_ref, g_match_info_unref)
#define g_variant_type_get_type g_variant_type_get_gtype
G_DEFINE_BOXED_TYPE (GVariantType, g_variant_type, g_variant_type_copy, g_variant_type_free)
#undef g_variant_type_get_type
G_DEFINE_BOXED_TYPE (GVariantBuilder, g_variant_builder, g_variant_builder_ref, g_variant_builder_unref)
G_DEFINE_BOXED_TYPE (GVariantDict, g_variant_dict, g_variant_dict_ref, g_variant_dict_unref)
G_DEFINE_BOXED_TYPE (GError, g_error, g_error_copy, g_error_free)
G_DEFINE_BOXED_TYPE (GDateTime, g_date_time, g_date_time_ref, g_date_time_unref)
G_DEFINE_BOXED_TYPE (GTimeZone, g_time_zone, g_time_zone_ref, g_time_zone_unref)
G_DEFINE_BOXED_TYPE (GKeyFile, g_key_file, g_key_file_ref, g_key_file_unref)
G_DEFINE_BOXED_TYPE (GMappedFile, g_mapped_file, g_mapped_file_ref, g_mapped_file_unref)
G_DEFINE_BOXED_TYPE (GMainLoop, g_main_loop, g_main_loop_ref, g_main_loop_unref)
G_DEFINE_BOXED_TYPE (GMainContext, g_main_context, g_main_context_ref, g_main_context_unref)
G_DEFINE_BOXED_TYPE (GSource, g_source, g_source_ref, g_source_unref)
G_DEFINE_BOXED_TYPE (GPollFD, g_pollfd, pollfd_copy, g_free)
G_DEFINE_BOXED_TYPE (GMarkupParseContext, g_markup_parse_context, g_markup_parse_context_ref, g_markup_parse_context_unref)
G_DEFINE_BOXED_TYPE (GThread, g_thread, g_thread_ref, g_thread_unref)
G_DEFINE_BOXED_TYPE (GChecksum, g_checksum, g_checksum_copy, g_checksum_free)
G_DEFINE_BOXED_TYPE (GOptionGroup, g_option_group, g_option_group_ref, g_option_group_unref)
/* This one can't use G_DEFINE_BOXED_TYPE (GStrv, g_strv, g_strdupv, g_strfreev) */
GType
g_strv_get_type (void)
{
static volatile gsize g_define_type_id__volatile = 0;
if (g_once_init_enter (&g_define_type_id__volatile))
{
GType g_define_type_id =
g_boxed_type_register_static (g_intern_static_string ("GStrv"),
(GBoxedCopyFunc) g_strdupv,
(GBoxedFreeFunc) g_strfreev);
g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
}
return g_define_type_id__volatile;
}
GType
g_variant_get_gtype (void)
{
return G_TYPE_VARIANT;
}
static void
boxed_proxy_value_init (GValue *value)
{
value->data[0].v_pointer = NULL;
}
static void
boxed_proxy_value_free (GValue *value)
{
if (value->data[0].v_pointer && !(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
_g_type_boxed_free (G_VALUE_TYPE (value), value->data[0].v_pointer);
}
static void
boxed_proxy_value_copy (const GValue *src_value,
GValue *dest_value)
{
if (src_value->data[0].v_pointer)
dest_value->data[0].v_pointer = _g_type_boxed_copy (G_VALUE_TYPE (src_value), src_value->data[0].v_pointer);
else
dest_value->data[0].v_pointer = src_value->data[0].v_pointer;
}
static gpointer
boxed_proxy_value_peek_pointer (const GValue *value)
{
return value->data[0].v_pointer;
}
static gchar*
boxed_proxy_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
if (!collect_values[0].v_pointer)
value->data[0].v_pointer = NULL;
else
{
if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
{
value->data[0].v_pointer = collect_values[0].v_pointer;
value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
}
else
value->data[0].v_pointer = _g_type_boxed_copy (G_VALUE_TYPE (value), collect_values[0].v_pointer);
}
return NULL;
}
static gchar*
boxed_proxy_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
gpointer *boxed_p = collect_values[0].v_pointer;
if (!boxed_p)
return g_strdup_printf ("value location for '%s' passed as NULL", G_VALUE_TYPE_NAME (value));
if (!value->data[0].v_pointer)
*boxed_p = NULL;
else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
*boxed_p = value->data[0].v_pointer;
else
*boxed_p = _g_type_boxed_copy (G_VALUE_TYPE (value), value->data[0].v_pointer);
return NULL;
}
/**
* g_boxed_type_register_static:
* @name: Name of the new boxed type.
* @boxed_copy: Boxed structure copy function.
* @boxed_free: Boxed structure free function.
*
* This function creates a new %G_TYPE_BOXED derived type id for a new
* boxed type with name @name. Boxed type handling functions have to be
* provided to copy and free opaque boxed structures of this type.
*
* Returns: New %G_TYPE_BOXED derived type id for @name.
*/
GType
g_boxed_type_register_static (const gchar *name,
GBoxedCopyFunc boxed_copy,
GBoxedFreeFunc boxed_free)
{
static const GTypeValueTable vtable = {
boxed_proxy_value_init,
boxed_proxy_value_free,
boxed_proxy_value_copy,
boxed_proxy_value_peek_pointer,
"p",
boxed_proxy_collect_value,
"p",
boxed_proxy_lcopy_value,
};
GTypeInfo type_info = {
0, /* class_size */
NULL, /* base_init */
NULL, /* base_finalize */
NULL, /* class_init */
NULL, /* class_finalize */
NULL, /* class_data */
0, /* instance_size */
0, /* n_preallocs */
NULL, /* instance_init */
&vtable, /* value_table */
};
GType type;
g_return_val_if_fail (name != NULL, 0);
g_return_val_if_fail (boxed_copy != NULL, 0);
g_return_val_if_fail (boxed_free != NULL, 0);
g_return_val_if_fail (g_type_from_name (name) == 0, 0);
type = g_type_register_static (G_TYPE_BOXED, name, &type_info, 0);
/* install proxy functions upon successful registration */
if (type)
_g_type_boxed_init (type, boxed_copy, boxed_free);
return type;
}
/**
* g_boxed_copy:
* @boxed_type: The type of @src_boxed.
* @src_boxed: (not nullable): The boxed structure to be copied.
*
* Provide a copy of a boxed structure @src_boxed which is of type @boxed_type.
*
* Returns: (transfer full) (not nullable): The newly created copy of the boxed
* structure.
*/
gpointer
g_boxed_copy (GType boxed_type,
gconstpointer src_boxed)
{
GTypeValueTable *value_table;
gpointer dest_boxed;
g_return_val_if_fail (G_TYPE_IS_BOXED (boxed_type), NULL);
g_return_val_if_fail (G_TYPE_IS_ABSTRACT (boxed_type) == FALSE, NULL);
g_return_val_if_fail (src_boxed != NULL, NULL);
value_table = g_type_value_table_peek (boxed_type);
if (!value_table)
g_return_val_if_fail (G_TYPE_IS_VALUE_TYPE (boxed_type), NULL);
/* check if our proxying implementation is used, we can short-cut here */
if (value_table->value_copy == boxed_proxy_value_copy)
dest_boxed = _g_type_boxed_copy (boxed_type, (gpointer) src_boxed);
else
{
GValue src_value, dest_value;
/* we heavily rely on third-party boxed type value vtable
* implementations to follow normal boxed value storage
* (data[0].v_pointer is the boxed struct, and
* data[1].v_uint holds the G_VALUE_NOCOPY_CONTENTS flag,
* rest zero).
* but then, we can expect that since we laid out the
* g_boxed_*() API.
* data[1].v_uint&G_VALUE_NOCOPY_CONTENTS shouldn't be set
* after a copy.
*/
/* equiv. to g_value_set_static_boxed() */
value_meminit (&src_value, boxed_type);
src_value.data[0].v_pointer = (gpointer) src_boxed;
src_value.data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
/* call third-party code copy function, fingers-crossed */
value_meminit (&dest_value, boxed_type);
value_table->value_copy (&src_value, &dest_value);
/* double check and grouse if things went wrong */
if (dest_value.data[1].v_ulong)
g_warning ("the copy_value() implementation of type '%s' seems to make use of reserved GValue fields",
g_type_name (boxed_type));
dest_boxed = dest_value.data[0].v_pointer;
}
return dest_boxed;
}
/**
* g_boxed_free:
* @boxed_type: The type of @boxed.
* @boxed: (not nullable): The boxed structure to be freed.
*
* Free the boxed structure @boxed which is of type @boxed_type.
*/
void
g_boxed_free (GType boxed_type,
gpointer boxed)
{
GTypeValueTable *value_table;
g_return_if_fail (G_TYPE_IS_BOXED (boxed_type));
g_return_if_fail (G_TYPE_IS_ABSTRACT (boxed_type) == FALSE);
g_return_if_fail (boxed != NULL);
value_table = g_type_value_table_peek (boxed_type);
if (!value_table)
g_return_if_fail (G_TYPE_IS_VALUE_TYPE (boxed_type));
/* check if our proxying implementation is used, we can short-cut here */
if (value_table->value_free == boxed_proxy_value_free)
_g_type_boxed_free (boxed_type, boxed);
else
{
GValue value;
/* see g_boxed_copy() on why we think we can do this */
value_meminit (&value, boxed_type);
value.data[0].v_pointer = boxed;
value_table->value_free (&value);
}
}
/**
* g_value_get_boxed:
* @value: a valid #GValue of %G_TYPE_BOXED derived type
*
* Get the contents of a %G_TYPE_BOXED derived #GValue.
*
* Returns: (transfer none): boxed contents of @value
*/
gpointer
g_value_get_boxed (const GValue *value)
{
g_return_val_if_fail (G_VALUE_HOLDS_BOXED (value), NULL);
g_return_val_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)), NULL);
return value->data[0].v_pointer;
}
/**
* g_value_dup_boxed: (skip)
* @value: a valid #GValue of %G_TYPE_BOXED derived type
*
* Get the contents of a %G_TYPE_BOXED derived #GValue. Upon getting,
* the boxed value is duplicated and needs to be later freed with
* g_boxed_free(), e.g. like: g_boxed_free (G_VALUE_TYPE (@value),
* return_value);
*
* Returns: boxed contents of @value
*/
gpointer
g_value_dup_boxed (const GValue *value)
{
g_return_val_if_fail (G_VALUE_HOLDS_BOXED (value), NULL);
g_return_val_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)), NULL);
return value->data[0].v_pointer ? g_boxed_copy (G_VALUE_TYPE (value), value->data[0].v_pointer) : NULL;
}
static inline void
value_set_boxed_internal (GValue *value,
gconstpointer boxed,
gboolean need_copy,
gboolean need_free)
{
if (!boxed)
{
/* just resetting to NULL might not be desired, need to
* have value reinitialized also (for values defaulting
* to other default value states than a NULL data pointer),
* g_value_reset() will handle this
*/
g_value_reset (value);
return;
}
if (value->data[0].v_pointer && !(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
g_boxed_free (G_VALUE_TYPE (value), value->data[0].v_pointer);
value->data[1].v_uint = need_free ? 0 : G_VALUE_NOCOPY_CONTENTS;
value->data[0].v_pointer = need_copy ? g_boxed_copy (G_VALUE_TYPE (value), boxed) : (gpointer) boxed;
}
/**
* g_value_set_boxed:
* @value: a valid #GValue of %G_TYPE_BOXED derived type
* @v_boxed: (nullable): boxed value to be set
*
* Set the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed.
*/
void
g_value_set_boxed (GValue *value,
gconstpointer boxed)
{
g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
value_set_boxed_internal (value, boxed, TRUE, TRUE);
}
/**
* g_value_set_static_boxed:
* @value: a valid #GValue of %G_TYPE_BOXED derived type
* @v_boxed: (nullable): static boxed value to be set
*
* Set the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed.
* The boxed value is assumed to be static, and is thus not duplicated
* when setting the #GValue.
*/
void
g_value_set_static_boxed (GValue *value,
gconstpointer boxed)
{
g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
value_set_boxed_internal (value, boxed, FALSE, FALSE);
}
/**
* g_value_set_boxed_take_ownership:
* @value: a valid #GValue of %G_TYPE_BOXED derived type
* @v_boxed: (nullable): duplicated unowned boxed value to be set
*
* This is an internal function introduced mainly for C marshallers.
*
* Deprecated: 2.4: Use g_value_take_boxed() instead.
*/
void
g_value_set_boxed_take_ownership (GValue *value,
gconstpointer boxed)
{
g_value_take_boxed (value, boxed);
}
/**
* g_value_take_boxed:
* @value: a valid #GValue of %G_TYPE_BOXED derived type
* @v_boxed: (nullable): duplicated unowned boxed value to be set
*
* Sets the contents of a %G_TYPE_BOXED derived #GValue to @v_boxed
* and takes over the ownership of the callers reference to @v_boxed;
* the caller doesn't have to unref it any more.
*
* Since: 2.4
*/
void
g_value_take_boxed (GValue *value,
gconstpointer boxed)
{
g_return_if_fail (G_VALUE_HOLDS_BOXED (value));
g_return_if_fail (G_TYPE_IS_VALUE (G_VALUE_TYPE (value)));
value_set_boxed_internal (value, boxed, FALSE, TRUE);
}