Someone

static gboolean
_notify_daemon_process_icon_data(NotifyDaemon *daemon, GtkWindow *nw,
								 GValue *icon_data)
{
	const guchar *data = NULL;
	gboolean has_alpha;
	int bits_per_sample;
	int width;
	int height;
	int rowstride;
	int n_channels;
	gsize expected_len;
	GdkPixbuf *pixbuf;
	GValueArray *image_struct;
	GValue *value;
	GArray *tmp_array;

	if (!G_VALUE_HOLDS(icon_data, G_TYPE_VALUE_ARRAY))
	{
		g_warning("_notify_daemon_process_icon_data expected a "
				  "GValue of type GValueArray");
		return FALSE;
	}

	image_struct = (GValueArray *)g_value_get_boxed(icon_data);
	value = g_value_array_get_nth(image_struct, 0);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected position "
				  "0 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_INT))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 0 of the GValueArray to be of type int");
		return FALSE;
	}

	width = g_value_get_int(value);
	value = g_value_array_get_nth(image_struct, 1);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 1 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_INT))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 1 of the GValueArray to be of type int");
		return FALSE;
	}

	height = g_value_get_int(value);
	value = g_value_array_get_nth(image_struct, 2);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 2 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_INT))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 2 of the GValueArray to be of type int");
		return FALSE;
	}

	rowstride = g_value_get_int(value);
	value = g_value_array_get_nth(image_struct, 3);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 3 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_BOOLEAN))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 3 of the GValueArray to be of type gboolean");
		return FALSE;
	}

	has_alpha = g_value_get_boolean(value);
	value = g_value_array_get_nth(image_struct, 4);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 4 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_INT))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 4 of the GValueArray to be of type int");
		return FALSE;
	}

	bits_per_sample = g_value_get_int(value);
	value = g_value_array_get_nth(image_struct, 5);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 5 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value, G_TYPE_INT))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 5 of the GValueArray to be of type int");
		return FALSE;
	}

	n_channels = g_value_get_int(value);
	value = g_value_array_get_nth(image_struct, 6);

	if (value == NULL)
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 6 of the GValueArray to exist");
		return FALSE;
	}

	if (!G_VALUE_HOLDS(value,
					   dbus_g_type_get_collection("GArray", G_TYPE_UCHAR)))
	{
		g_warning("_notify_daemon_process_icon_data expected "
				  "position 6 of the GValueArray to be of type GArray");
		return FALSE;
	}

	tmp_array = (GArray *)g_value_get_boxed(value);
	expected_len = (height - 1) * rowstride + width *
	               ((n_channels * bits_per_sample + 7) / 8);

	if (expected_len != tmp_array->len)
	{
		g_warning("_notify_daemon_process_icon_data expected image "
				  "data to be of length %i but got a length of %i",
				  expected_len, tmp_array->len);
		return FALSE;
	}

	data = (guchar *)g_memdup(tmp_array->data, tmp_array->len);
	pixbuf = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, has_alpha,
									  bits_per_sample, width, height,
									  rowstride,
									  (GdkPixbufDestroyNotify)g_free,
									  NULL);
	theme_set_notification_icon(nw, pixbuf);
	g_object_unref(G_OBJECT(pixbuf));

	return TRUE;
}