def __len__(self):
        if self._len is not None:
            return self._len
        ret = 0
        for cluster_start, num_clusters in self._runentries:
            g_logger.debug("NonResidentAttributeData: len: run: cluster: %s len: %s", hex(cluster_start), hex(num_clusters))
            ret += num_clusters * self._clusters.get_cluster_size()
        self._len = ret
        return ret
dataset/ETHPy150Open williballenthin/python-ntfs/ntfs/filesystem/__init__.py/NonResidentAttributeData.__len__/original