224     _PACK_STR = '!BBH'  variable in RouterLSA
225     _PACK_LEN = struct.calcsize(_PACK_STR)  # 4bytes
228         _PACK_STR = '!4s4sBBH'  variable in RouterLSA.Link
229         _PACK_LEN = struct.calcsize(_PACK_STR)  # 12bytes
247                 struct.unpack_from(cls._PACK_STR, six.binary_type(link))
256                 struct.pack(self._PACK_STR, id_, data, self.type_, self.tos,
274         (flags, _, num) = struct.unpack_from(cls._PACK_STR,
287             struct.pack(self._PACK_STR, self.flags, 0, len(self.links)))
297     _PACK_STR = '!4s'  variable in NetworkLSA
298     _PACK_LEN = struct.calcsize(_PACK_STR)
316         (mask,) = struct.unpack_from(cls._PACK_STR, six.binary_type(binmask))
322             (router,) = struct.unpack_from(cls._PACK_STR,
342     _PACK_STR = '!4sB3s'  variable in SummaryLSA
343     _PACK_LEN = struct.calcsize(_PACK_STR)
362             cls._PACK_STR, six.binary_type(buf))
374         return bytearray(struct.pack(self._PACK_STR, mask, self.tos, metric))
385         _PACK_STR = '!4sB3s4sI'  variable in ASExternalLSA.ExternalNetwork
386         _PACK_LEN = struct.calcsize(_PACK_STR)
404              tag) = struct.unpack_from(cls._PACK_STR, six.binary_type(ext_nw))
415                 struct.pack(self._PACK_STR, mask, self.flags, metric,
706     _PACK_STR = '!4sHBBI4s4s'  # + neighbors  variable in OSPFHello
707     _PACK_LEN = struct.calcsize(_PACK_STR)
731          designated_router, backup_router) = struct.unpack_from(cls._PACK_STR,
756             struct.pack(self._PACK_STR,
773     _PACK_STR = '!HBBI'  # + LSA_HEADERS  variable in OSPFDBDesc
774     _PACK_LEN = struct.calcsize(_PACK_STR)
796          sequence_number) = struct.unpack_from(cls._PACK_STR, six.binary_type(buf))
820             struct.pack(self._PACK_STR, self.mtu, self.options, flags,
834         _PACK_STR = '!I4s4s'  variable in OSPFLSReq.Request
835         _PACK_LEN = struct.calcsize(_PACK_STR)
850             (type_, id_, adv_router) = struct.unpack_from(cls._PACK_STR,
859             return struct.pack(self._PACK_STR, self.type_, id_, adv_router)
887     _PACK_STR = '!I'  variable in OSPFLSUpd
888     _PACK_LEN = struct.calcsize(_PACK_STR)
903         (num,) = struct.unpack_from(cls._PACK_STR, six.binary_type(binnum))
916         head = bytearray(struct.pack(self._PACK_STR, len(self.lsas)))