def __init__(self, reader, directory):
if directory.streams[1].content_size == 0:
raise PdbMissingNameStreamError()
bits = BitAccess(512 * 1024)
directory.streams[1].read(reader, bits)
(self.name_index, self.ver, self.sig, self.age,
self.guid) = PdbFile.load_name_index(bits)
