/* GIO - GLib Input, Output and Streaming Library
*
* Copyright © 2011 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 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 .
*
* Authors: Alexander Larsson
*/
#include "config.h"
#include
#include "gresource.h"
#include
#include
#include
#include
#include
struct _GResource
{
int ref_count;
GvdbTable *table;
};
static void register_lazy_static_resources (void);
G_DEFINE_BOXED_TYPE (GResource, g_resource, g_resource_ref, g_resource_unref)
/**
* SECTION:gresource
* @short_description: Resource framework
* @include: gio/gio.h
*
* Applications and libraries often contain binary or textual data that is
* really part of the application, rather than user data. For instance
* #GtkBuilder .ui files, splashscreen images, GMenu markup XML, CSS files,
* icons, etc. These are often shipped as files in `$datadir/appname`, or
* manually included as literal strings in the code.
*
* The #GResource API and the [glib-compile-resources][glib-compile-resources] program
* provide a convenient and efficient alternative to this which has some nice properties. You
* maintain the files as normal files, so its easy to edit them, but during the build the files
* are combined into a binary bundle that is linked into the executable. This means that loading
* the resource files are efficient (as they are already in memory, shared with other instances) and
* simple (no need to check for things like I/O errors or locate the files in the filesystem). It
* also makes it easier to create relocatable applications.
*
* Resource files can also be marked as compressed. Such files will be included in the resource bundle
* in a compressed form, but will be automatically uncompressed when the resource is used. This
* is very useful e.g. for larger text files that are parsed once (or rarely) and then thrown away.
*
* Resource files can also be marked to be preprocessed, by setting the value of the
* `preprocess` attribute to a comma-separated list of preprocessing options.
* The only options currently supported are:
*
* `xml-stripblanks` which will use the xmllint command
* to strip ignorable whitespace from the XML file. For this to work,
* the `XMLLINT` environment variable must be set to the full path to
* the xmllint executable, or xmllint must be in the `PATH`; otherwise
* the preprocessing step is skipped.
*
* `to-pixdata` which will use the gdk-pixbuf-pixdata command to convert
* images to the GdkPixdata format, which allows you to create pixbufs directly using the data inside
* the resource file, rather than an (uncompressed) copy if it. For this, the gdk-pixbuf-pixdata
* program must be in the PATH, or the `GDK_PIXBUF_PIXDATA` environment variable must be
* set to the full path to the gdk-pixbuf-pixdata executable; otherwise the resource compiler will
* abort.
*
* Resource bundles are created by the [glib-compile-resources][glib-compile-resources] program
* which takes an XML file that describes the bundle, and a set of files that the XML references. These
* are combined into a binary resource bundle.
*
* An example resource description:
* |[
*
*
*
* data/splashscreen.png
* dialog.ui
* menumarkup.xml
*
*
* ]|
*
* This will create a resource bundle with the following files:
* |[
* /org/gtk/Example/data/splashscreen.png
* /org/gtk/Example/dialog.ui
* /org/gtk/Example/menumarkup.xml
* ]|
*
* Note that all resources in the process share the same namespace, so use Java-style
* path prefixes (like in the above example) to avoid conflicts.
*
* You can then use [glib-compile-resources][glib-compile-resources] to compile the XML to a
* binary bundle that you can load with g_resource_load(). However, its more common to use the --generate-source and
* --generate-header arguments to create a source file and header to link directly into your application.
* This will generate `get_resource()`, `register_resource()` and
* `unregister_resource()` functions, prefixed by the `--c-name` argument passed
* to [glib-compile-resources][glib-compile-resources]. `get_resource()` returns
* the generated #GResource object. The register and unregister functions
* register the resource so its files can be accessed using
* g_resources_lookup_data().
*
* Once a #GResource has been created and registered all the data in it can be accessed globally in the process by
* using API calls like g_resources_open_stream() to stream the data or g_resources_lookup_data() to get a direct pointer
* to the data. You can also use URIs like "resource:///org/gtk/Example/data/splashscreen.png" with #GFile to access
* the resource data.
*
* There are two forms of the generated source, the default version uses the compiler support for constructor
* and destructor functions (where available) to automatically create and register the #GResource on startup
* or library load time. If you pass --manual-register two functions to register/unregister the resource is instead
* created. This requires an explicit initialization call in your application/library, but it works on all platforms,
* even on the minor ones where this is not available. (Constructor support is available for at least Win32, Mac OS and Linux.)
*
* Note that resource data can point directly into the data segment of e.g. a library, so if you are unloading libraries
* during runtime you need to be very careful with keeping around pointers to data from a resource, as this goes away
* when the library is unloaded. However, in practice this is not generally a problem, since most resource accesses
* is for your own resources, and resource data is often used once, during parsing, and then released.
*
* Since: 2.32
*/
/**
* GStaticResource:
*
* #GStaticResource is an opaque data structure and can only be accessed
* using the following functions.
**/
/**
* g_resource_error_quark:
*
* Gets the #GResource Error Quark.
*
* Returns: a #GQuark
*
* Since: 2.32
*/
G_DEFINE_QUARK (g-resource-error-quark, g_resource_error)
/**
* g_resource_ref:
* @resource: A #GResource
*
* Atomically increments the reference count of @resource by one. This
* function is MT-safe and may be called from any thread.
*
* Returns: The passed in #GResource
*
* Since: 2.32
**/
GResource *
g_resource_ref (GResource *resource)
{
g_atomic_int_inc (&resource->ref_count);
return resource;
}
/**
* g_resource_unref:
* @resource: A #GResource
*
* Atomically decrements the reference count of @resource by one. If the
* reference count drops to 0, all memory allocated by the resource is
* released. This function is MT-safe and may be called from any
* thread.
*
* Since: 2.32
**/
void
g_resource_unref (GResource *resource)
{
if (g_atomic_int_dec_and_test (&resource->ref_count))
{
gvdb_table_unref (resource->table);
g_free (resource);
}
}
/*< internal >
* g_resource_new_from_table:
* @table: (transfer full): a GvdbTable
*
* Returns: (transfer full): a new #GResource for @table
*/
static GResource *
g_resource_new_from_table (GvdbTable *table)
{
GResource *resource;
resource = g_new (GResource, 1);
resource->ref_count = 1;
resource->table = table;
return resource;
}
/**
* g_resource_new_from_data:
* @data: A #GBytes
* @error: return location for a #GError, or %NULL
*
* Creates a GResource from a reference to the binary resource bundle.
* This will keep a reference to @data while the resource lives, so
* the data should not be modified or freed.
*
* If you want to use this resource in the global resource namespace you need
* to register it with g_resources_register().
*
* Returns: (transfer full): a new #GResource, or %NULL on error
*
* Since: 2.32
**/
GResource *
g_resource_new_from_data (GBytes *data,
GError **error)
{
GvdbTable *table;
table = gvdb_table_new_from_data (g_bytes_get_data (data, NULL),
g_bytes_get_size (data),
TRUE,
g_bytes_ref (data),
(GvdbRefFunc)g_bytes_ref,
(GDestroyNotify)g_bytes_unref,
error);
if (table == NULL)
return NULL;
return g_resource_new_from_table (table);
}
/**
* g_resource_load:
* @filename: (type filename): the path of a filename to load, in the GLib filename encoding
* @error: return location for a #GError, or %NULL
*
* Loads a binary resource bundle and creates a #GResource representation of it, allowing
* you to query it for data.
*
* If you want to use this resource in the global resource namespace you need
* to register it with g_resources_register().
*
* Returns: (transfer full): a new #GResource, or %NULL on error
*
* Since: 2.32
**/
GResource *
g_resource_load (const gchar *filename,
GError **error)
{
GvdbTable *table;
table = gvdb_table_new (filename, FALSE, error);
if (table == NULL)
return NULL;
return g_resource_new_from_table (table);
}
static
gboolean do_lookup (GResource *resource,
const gchar *path,
GResourceLookupFlags lookup_flags,
gsize *size,
guint32 *flags,
const void **data,
gsize *data_size,
GError **error)
{
char *free_path = NULL;
gsize path_len;
gboolean res = FALSE;
GVariant *value;
path_len = strlen (path);
if (path[path_len-1] == '/')
{
path = free_path = g_strdup (path);
free_path[path_len-1] = 0;
}
value = gvdb_table_get_raw_value (resource->table, path);
if (value == NULL)
{
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
}
else
{
guint32 _size, _flags;
GVariant *array;
g_variant_get (value, "(uu@ay)",
&_size,
&_flags,
&array);
_size = GUINT32_FROM_LE (_size);
_flags = GUINT32_FROM_LE (_flags);
if (size)
*size = _size;
if (flags)
*flags = _flags;
if (data)
*data = g_variant_get_data (array);
if (data_size)
{
/* Don't report trailing newline that non-compressed files has */
if (_flags & G_RESOURCE_FLAGS_COMPRESSED)
*data_size = g_variant_get_size (array);
else
*data_size = g_variant_get_size (array) - 1;
}
g_variant_unref (array);
g_variant_unref (value);
res = TRUE;
}
g_free (free_path);
return res;
}
/**
* g_resource_open_stream:
* @resource: A #GResource
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the resource and
* returns a #GInputStream that lets you read the data.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (transfer full): #GInputStream or %NULL on error.
* Free the returned object with g_object_unref()
*
* Since: 2.32
**/
GInputStream *
g_resource_open_stream (GResource *resource,
const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
const void *data;
gsize data_size;
guint32 flags;
GInputStream *stream, *stream2;
if (!do_lookup (resource, path, lookup_flags, NULL, &flags, &data, &data_size, error))
return NULL;
stream = g_memory_input_stream_new_from_data (data, data_size, NULL);
g_object_set_data_full (G_OBJECT (stream), "g-resource",
g_resource_ref (resource),
(GDestroyNotify)g_resource_unref);
if (flags & G_RESOURCE_FLAGS_COMPRESSED)
{
GZlibDecompressor *decompressor =
g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_ZLIB);
stream2 = g_converter_input_stream_new (stream, G_CONVERTER (decompressor));
g_object_unref (decompressor);
g_object_unref (stream);
stream = stream2;
}
return stream;
}
/**
* g_resource_lookup_data:
* @resource: A #GResource
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the resource and
* returns a #GBytes that lets you directly access the data in
* memory.
*
* The data is always followed by a zero byte, so you
* can safely use the data as a C string. However, that byte
* is not included in the size of the GBytes.
*
* For uncompressed resource files this is a pointer directly into
* the resource bundle, which is typically in some readonly data section
* in the program binary. For compressed files we allocate memory on
* the heap and automatically uncompress the data.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (transfer full): #GBytes or %NULL on error.
* Free the returned object with g_bytes_unref()
*
* Since: 2.32
**/
GBytes *
g_resource_lookup_data (GResource *resource,
const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
const void *data;
guint32 flags;
gsize data_size;
gsize size;
if (!do_lookup (resource, path, lookup_flags, &size, &flags, &data, &data_size, error))
return NULL;
if (flags & G_RESOURCE_FLAGS_COMPRESSED)
{
char *uncompressed, *d;
const char *s;
GConverterResult res;
gsize d_size, s_size;
gsize bytes_read, bytes_written;
GZlibDecompressor *decompressor =
g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_ZLIB);
uncompressed = g_malloc (size + 1);
s = data;
s_size = data_size;
d = uncompressed;
d_size = size;
do
{
res = g_converter_convert (G_CONVERTER (decompressor),
s, s_size,
d, d_size,
G_CONVERTER_INPUT_AT_END,
&bytes_read,
&bytes_written,
NULL);
if (res == G_CONVERTER_ERROR)
{
g_free (uncompressed);
g_object_unref (decompressor);
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_INTERNAL,
_("The resource at '%s' failed to decompress"),
path);
return NULL;
}
s += bytes_read;
s_size -= bytes_read;
d += bytes_written;
d_size -= bytes_written;
}
while (res != G_CONVERTER_FINISHED);
uncompressed[size] = 0; /* Zero terminate */
g_object_unref (decompressor);
return g_bytes_new_take (uncompressed, size);
}
else
return g_bytes_new_with_free_func (data, data_size, (GDestroyNotify)g_resource_unref, g_resource_ref (resource));
}
/**
* g_resource_get_info:
* @resource: A #GResource
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @size: (out) (allow-none): a location to place the length of the contents of the file,
* or %NULL if the length is not needed
* @flags: (out) (allow-none): a location to place the flags about the file,
* or %NULL if the length is not needed
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the resource and
* if found returns information about it.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: %TRUE if the file was found. %FALSE if there were errors
*
* Since: 2.32
**/
gboolean
g_resource_get_info (GResource *resource,
const gchar *path,
GResourceLookupFlags lookup_flags,
gsize *size,
guint32 *flags,
GError **error)
{
return do_lookup (resource, path, lookup_flags, size, flags, NULL, NULL, error);
}
/**
* g_resource_enumerate_children:
* @resource: A #GResource
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Returns all the names of children at the specified @path in the resource.
* The return result is a %NULL terminated list of strings which should
* be released with g_strfreev().
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (array zero-terminated=1) (transfer full): an array of constant strings
*
* Since: 2.32
**/
gchar **
g_resource_enumerate_children (GResource *resource,
const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
gchar **children;
gsize path_len;
char *path_with_slash;
if (*path == 0)
{
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
return NULL;
}
path_len = strlen (path);
if (path[path_len-1] != '/')
path_with_slash = g_strconcat (path, "/", NULL);
else
path_with_slash = g_strdup (path);
children = gvdb_table_list (resource->table, path_with_slash);
g_free (path_with_slash);
if (children == NULL)
{
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
return NULL;
}
return children;
}
static GRWLock resources_lock;
static GList *registered_resources;
/* This is updated atomically, so we can append to it and check for NULL outside the
lock, but all other accesses are done under the write lock */
static GStaticResource *lazy_register_resources;
static void
g_resources_register_unlocked (GResource *resource)
{
registered_resources = g_list_prepend (registered_resources, g_resource_ref (resource));
}
static void
g_resources_unregister_unlocked (GResource *resource)
{
if (g_list_find (registered_resources, resource) == NULL)
{
g_warning ("Tried to remove not registered resource");
}
else
{
registered_resources = g_list_remove (registered_resources, resource);
g_resource_unref (resource);
}
}
/**
* g_resources_register:
* @resource: A #GResource
*
* Registers the resource with the process-global set of resources.
* Once a resource is registered the files in it can be accessed
* with the global resource lookup functions like g_resources_lookup_data().
*
* Since: 2.32
**/
void
g_resources_register (GResource *resource)
{
g_rw_lock_writer_lock (&resources_lock);
g_resources_register_unlocked (resource);
g_rw_lock_writer_unlock (&resources_lock);
}
/**
* g_resources_unregister:
* @resource: A #GResource
*
* Unregisters the resource from the process-global set of resources.
*
* Since: 2.32
**/
void
g_resources_unregister (GResource *resource)
{
g_rw_lock_writer_lock (&resources_lock);
g_resources_unregister_unlocked (resource);
g_rw_lock_writer_unlock (&resources_lock);
}
/**
* g_resources_open_stream:
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the set of
* globally registered resources and returns a #GInputStream
* that lets you read the data.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (transfer full): #GInputStream or %NULL on error.
* Free the returned object with g_object_unref()
*
* Since: 2.32
**/
GInputStream *
g_resources_open_stream (const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
GInputStream *res = NULL;
GList *l;
GInputStream *stream;
register_lazy_static_resources ();
g_rw_lock_reader_lock (&resources_lock);
for (l = registered_resources; l != NULL; l = l->next)
{
GResource *r = l->data;
GError *my_error = NULL;
stream = g_resource_open_stream (r, path, lookup_flags, &my_error);
if (stream == NULL &&
g_error_matches (my_error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND))
{
g_clear_error (&my_error);
}
else
{
if (stream == NULL)
g_propagate_error (error, my_error);
res = stream;
break;
}
}
if (l == NULL)
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
g_rw_lock_reader_unlock (&resources_lock);
return res;
}
/**
* g_resources_lookup_data:
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the set of
* globally registered resources and returns a #GBytes that
* lets you directly access the data in memory.
*
* The data is always followed by a zero byte, so you
* can safely use the data as a C string. However, that byte
* is not included in the size of the GBytes.
*
* For uncompressed resource files this is a pointer directly into
* the resource bundle, which is typically in some readonly data section
* in the program binary. For compressed files we allocate memory on
* the heap and automatically uncompress the data.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (transfer full): #GBytes or %NULL on error.
* Free the returned object with g_bytes_unref()
*
* Since: 2.32
**/
GBytes *
g_resources_lookup_data (const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
GBytes *res = NULL;
GList *l;
GBytes *data;
register_lazy_static_resources ();
g_rw_lock_reader_lock (&resources_lock);
for (l = registered_resources; l != NULL; l = l->next)
{
GResource *r = l->data;
GError *my_error = NULL;
data = g_resource_lookup_data (r, path, lookup_flags, &my_error);
if (data == NULL &&
g_error_matches (my_error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND))
{
g_clear_error (&my_error);
}
else
{
if (data == NULL)
g_propagate_error (error, my_error);
res = data;
break;
}
}
if (l == NULL)
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
g_rw_lock_reader_unlock (&resources_lock);
return res;
}
/**
* g_resources_enumerate_children:
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @error: return location for a #GError, or %NULL
*
* Returns all the names of children at the specified @path in the set of
* globally registered resources.
* The return result is a %NULL terminated list of strings which should
* be released with g_strfreev().
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: (array zero-terminated=1) (transfer full): an array of constant strings
*
* Since: 2.32
**/
gchar **
g_resources_enumerate_children (const gchar *path,
GResourceLookupFlags lookup_flags,
GError **error)
{
GHashTable *hash = NULL;
GList *l;
char **children;
int i;
register_lazy_static_resources ();
g_rw_lock_reader_lock (&resources_lock);
for (l = registered_resources; l != NULL; l = l->next)
{
GResource *r = l->data;
children = g_resource_enumerate_children (r, path, 0, NULL);
if (children != NULL)
{
if (hash == NULL)
hash = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
for (i = 0; children[i] != NULL; i++)
g_hash_table_insert (hash, children[i], children[i]);
g_free (children);
}
}
g_rw_lock_reader_unlock (&resources_lock);
if (hash == NULL)
{
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
return NULL;
}
else
{
GHashTableIter iter;
const char *key;
guint n_children;
n_children = g_hash_table_size (hash);
children = g_new (char *, n_children + 1);
i = 0;
g_hash_table_iter_init (&iter, hash);
while (g_hash_table_iter_next (&iter, (gpointer *)&key, NULL))
children[i++] = g_strdup (key);
children[i++] = NULL;
g_hash_table_destroy (hash);
return children;
}
}
/**
* g_resources_get_info:
* @path: A pathname inside the resource
* @lookup_flags: A #GResourceLookupFlags
* @size: (out) (allow-none): a location to place the length of the contents of the file,
* or %NULL if the length is not needed
* @flags: (out) (allow-none): a location to place the flags about the file,
* or %NULL if the length is not needed
* @error: return location for a #GError, or %NULL
*
* Looks for a file at the specified @path in the set of
* globally registered resources and if found returns information about it.
*
* @lookup_flags controls the behaviour of the lookup.
*
* Returns: %TRUE if the file was found. %FALSE if there were errors
*
* Since: 2.32
**/
gboolean
g_resources_get_info (const gchar *path,
GResourceLookupFlags lookup_flags,
gsize *size,
guint32 *flags,
GError **error)
{
gboolean res = FALSE;
GList *l;
gboolean r_res;
register_lazy_static_resources ();
g_rw_lock_reader_lock (&resources_lock);
for (l = registered_resources; l != NULL; l = l->next)
{
GResource *r = l->data;
GError *my_error = NULL;
r_res = g_resource_get_info (r, path, lookup_flags, size, flags, &my_error);
if (!r_res &&
g_error_matches (my_error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND))
{
g_clear_error (&my_error);
}
else
{
if (!r_res)
g_propagate_error (error, my_error);
res = r_res;
break;
}
}
if (l == NULL)
g_set_error (error, G_RESOURCE_ERROR, G_RESOURCE_ERROR_NOT_FOUND,
_("The resource at '%s' does not exist"),
path);
g_rw_lock_reader_unlock (&resources_lock);
return res;
}
/* This code is to handle registration of resources very early, from a constructor.
* At that point we'd like to do minimal work, to avoid ordering issues. For instance,
* we're not allowed to use g_malloc, as the user need to be able to call g_mem_set_vtable
* before the first call to g_malloc.
*
* So, what we do at construction time is that we just register a static structure on
* a list of resources that need to be initialized, and then later, when doing any lookups
* in the global list of registered resources, or when getting a reference to the
* lazily initialized resource we lazily create and register all the GResources on
* the lazy list.
*
* To avoid having to use locks in the constructor, and having to grab the writer lock
* when checking the lazy registering list we update lazy_register_resources in
* a lock-less fashion (atomic prepend-only, atomic replace with NULL). However, all
* operations except:
* * check if there are any resources to lazily initialize
* * Add a static resource to the lazy init list
* Do use the full writer lock for protection.
*/
static void
register_lazy_static_resources_unlocked (void)
{
GStaticResource *list;
do
list = lazy_register_resources;
while (!g_atomic_pointer_compare_and_exchange (&lazy_register_resources, list, NULL));
while (list != NULL)
{
GBytes *bytes = g_bytes_new_static (list->data, list->data_len);
GResource *resource = g_resource_new_from_data (bytes, NULL);
if (resource)
{
g_resources_register_unlocked (resource);
g_atomic_pointer_set (&list->resource, resource);
}
g_bytes_unref (bytes);
list = list->next;
}
}
static void
register_lazy_static_resources (void)
{
if (g_atomic_pointer_get (&lazy_register_resources) == NULL)
return;
g_rw_lock_writer_lock (&resources_lock);
register_lazy_static_resources_unlocked ();
g_rw_lock_writer_unlock (&resources_lock);
}
/**
* g_static_resource_init:
* @static_resource: pointer to a static #GStaticResource
*
* Initializes a GResource from static data using a
* GStaticResource.
*
* This is normally used by code generated by
* [glib-compile-resources][glib-compile-resources]
* and is not typically used by other code.
*
* Since: 2.32
**/
void
g_static_resource_init (GStaticResource *static_resource)
{
gpointer next;
do
{
next = lazy_register_resources;
static_resource->next = next;
}
while (!g_atomic_pointer_compare_and_exchange (&lazy_register_resources, next, static_resource));
}
/**
* g_static_resource_fini:
* @static_resource: pointer to a static #GStaticResource
*
* Finalized a GResource initialized by g_static_resource_init().
*
* This is normally used by code generated by
* [glib-compile-resources][glib-compile-resources]
* and is not typically used by other code.
*
* Since: 2.32
**/
void
g_static_resource_fini (GStaticResource *static_resource)
{
GResource *resource;
g_rw_lock_writer_lock (&resources_lock);
register_lazy_static_resources_unlocked ();
resource = g_atomic_pointer_get (&static_resource->resource);
if (resource)
{
g_atomic_pointer_set (&static_resource->resource, NULL);
g_resources_unregister_unlocked (resource);
g_resource_unref (resource);
}
g_rw_lock_writer_unlock (&resources_lock);
}
/**
* g_static_resource_get_resource:
* @static_resource: pointer to a static #GStaticResource
*
* Gets the GResource that was registered by a call to g_static_resource_init().
*
* This is normally used by code generated by
* [glib-compile-resources][glib-compile-resources]
* and is not typically used by other code.
*
* Returns: (transfer none): a #GResource
*
* Since: 2.32
**/
GResource *
g_static_resource_get_resource (GStaticResource *static_resource)
{
register_lazy_static_resources ();
return g_atomic_pointer_get (&static_resource->resource);
}