protected function doListContents($directory, $recursive)
	{
		$filter = function ($path) use ($directory, $recursive) {
			// Remove the root directory from any listing.
			if ($path === '') {
				return false;
			}

			if (Util::dirname($path) === $directory) {
				return true;
			}

			return $recursive && $this->pathIsInDirectory($path, $directory);
		};

		return \array_filter(\array_keys($this->storage), $filter);
	}