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file: add g_file_load_bytes()
This adds g_file_load_bytes() to make it more convenient to load the contents of a GFile as GBytes. It includes a special casing for gresources to increase the chances that the GBytes directly references the embedded data instead of copying to the heap. https://bugzilla.gnome.org/show_bug.cgi?id=790272
This commit is contained in:
Christian Hergert
parent
5464461e4c
commit
2227918dfd
@ -184,6 +184,9 @@ g_file_mount_enclosing_volume_finish
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g_file_monitor_directory
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g_file_monitor_file
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g_file_monitor
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g_file_load_bytes
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g_file_load_bytes_async
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g_file_load_bytes_finish
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g_file_load_contents
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g_file_load_contents_async
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g_file_load_contents_finish
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188
gio/gfile.c
188
gio/gfile.c
@ -8092,3 +8092,191 @@ g_file_supports_thread_contexts (GFile *file)
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iface = G_FILE_GET_IFACE (file);
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return iface->supports_thread_contexts;
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}
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/**
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* g_file_load_bytes:
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* @file: a #GFile
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* @cancellable: (nullable): a #GCancellable or %NULL
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* @etag_out: (out) (nullable) (optional): a location to place the current
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* entity tag for the file, or %NULL if the entity tag is not needed
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* @error: a location for a #GError or %NULL
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*
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* Loads the contents of @file and returns it as #GBytes.
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*
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* If @file is a resource:// based URI, the resulting bytes will reference the
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* embedded resource instead of a copy. Otherwise, this is equivalent to calling
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* g_file_load_contents() and g_bytes_new_take().
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*
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* For resources, @etag_out will be set to %NULL.
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*
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* The data contained in the resulting #GBytes is always zero-terminated, but
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* this is not included in the #GBytes length. The resulting #GBytes should be
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* freed with g_bytes_unref() when no longer in use.
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*
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* Returns: (transfer full): a #GBytes or %NULL and @error is set
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*
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* Since: 2.56
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*/
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GBytes *
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g_file_load_bytes (GFile *file,
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GCancellable *cancellable,
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gchar **etag_out,
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GError **error)
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{
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gchar *contents;
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gsize len;
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g_return_val_if_fail (G_IS_FILE (file), NULL);
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g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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if (etag_out != NULL)
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*etag_out = NULL;
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if (g_file_has_uri_scheme (file, "resource"))
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{
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GBytes *bytes;
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gchar *uri, *unescaped;
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uri = g_file_get_uri (file);
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unescaped = g_uri_unescape_string (uri + strlen ("resource://"), NULL);
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g_free (uri);
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bytes = g_resources_lookup_data (unescaped, G_RESOURCE_LOOKUP_FLAGS_NONE, error);
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g_free (unescaped);
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return bytes;
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}
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/* contents is guaranteed to be \0 terminated */
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if (g_file_load_contents (file, cancellable, &contents, &len, etag_out, error))
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return g_bytes_new_take (g_steal_pointer (&contents), len);
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return NULL;
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}
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static void
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g_file_load_bytes_cb (GObject *object,
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GAsyncResult *result,
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gpointer user_data)
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{
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GFile *file = G_FILE (object);
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GTask *task = user_data;
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GError *error = NULL;
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gchar *etag = NULL;
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gchar *contents = NULL;
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gsize len = 0;
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g_file_load_contents_finish (file, result, &contents, &len, &etag, &error);
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g_task_set_task_data (task, g_steal_pointer (&etag), g_free);
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if (error != NULL)
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g_task_return_error (task, g_steal_pointer (&error));
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else
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g_task_return_pointer (task,
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g_bytes_new_take (g_steal_pointer (&contents), len),
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(GDestroyNotify)g_bytes_unref);
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g_object_unref (task);
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}
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/**
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* g_file_load_bytes_async:
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* @file: a #GFile
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* @cancellable: (nullable): a #GCancellable or %NULL
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* @callback: (scope async): a #GAsyncReadyCallback to call when the
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* request is satisfied
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* @user_data: (closure): the data to pass to callback function
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*
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* Asynchronously loads the contents of @file as #GBytes.
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*
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* If @file is a resource:// based URI, the resulting bytes will reference the
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* embedded resource instead of a copy. Otherwise, this is equivalent to calling
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* g_file_load_contents_async() and g_bytes_new_take().
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*
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* @callback should call g_file_load_bytes_finish() to get the result of this
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* asynchronous operation.
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*
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* See g_file_load_bytes() for more information.
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*
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* Since: 2.56
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*/
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void
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g_file_load_bytes_async (GFile *file,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GError *error = NULL;
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GBytes *bytes;
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GTask *task;
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g_return_if_fail (G_IS_FILE (file));
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g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
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task = g_task_new (file, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_file_load_bytes_async);
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if (!g_file_has_uri_scheme (file, "resource"))
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{
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g_file_load_contents_async (file,
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cancellable,
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g_file_load_bytes_cb,
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g_steal_pointer (&task));
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return;
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}
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bytes = g_file_load_bytes (file, cancellable, NULL, &error);
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if (bytes == NULL)
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g_task_return_error (task, g_steal_pointer (&error));
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else
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g_task_return_pointer (task,
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g_steal_pointer (&bytes),
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(GDestroyNotify)g_bytes_unref);
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g_object_unref (task);
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}
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/**
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* g_file_load_bytes_finish:
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* @file: a #GFile
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* @result: a #GAsyncResult provided to the callback
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* @etag_out: (out) (nullable) (optional): a location to place the current
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* entity tag for the file, or %NULL if the entity tag is not needed
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* @error: a location for a #GError, or %NULL
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*
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* Completes an asynchronous request to g_file_load_bytes_async().
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*
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* For resources, @etag_out will be set to %NULL.
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*
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* The data contained in the resulting #GBytes is always zero-terminated, but
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* this is not included in the #GBytes length. The resulting #GBytes should be
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* freed with g_bytes_unref() when no longer in use.
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*
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* See g_file_load_bytes() for more information.
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*
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* Returns: (transfer full): a #GBytes or %NULL and @error is set
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*
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* Since: 2.56
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*/
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GBytes *
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g_file_load_bytes_finish (GFile *file,
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GAsyncResult *result,
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gchar **etag_out,
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GError **error)
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{
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GBytes *bytes;
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g_return_val_if_fail (G_IS_FILE (file), NULL);
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g_return_val_if_fail (G_IS_TASK (result), NULL);
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g_return_val_if_fail (g_task_is_valid (G_TASK (result), file), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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bytes = g_task_propagate_pointer (G_TASK (result), error);
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if (etag_out != NULL)
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*etag_out = g_strdup (g_task_get_task_data (G_TASK (result)));
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return bytes;
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}
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16
gio/gfile.h
16
gio/gfile.h
@ -1251,6 +1251,22 @@ gboolean g_file_replace_contents_finish (GFile *file,
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GLIB_AVAILABLE_IN_ALL
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gboolean g_file_supports_thread_contexts (GFile *file);
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GLIB_AVAILABLE_IN_2_56
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GBytes *g_file_load_bytes (GFile *file,
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GCancellable *cancellable,
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gchar **etag_out,
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GError **error);
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GLIB_AVAILABLE_IN_2_56
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void g_file_load_bytes_async (GFile *file,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GLIB_AVAILABLE_IN_2_56
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GBytes *g_file_load_bytes_finish (GFile *file,
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GAsyncResult *result,
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gchar **etag_out,
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GError **error);
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G_END_DECLS
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#endif /* __G_FILE_H__ */
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