Parse the given record and update properties accordingly

def from_bytes(cls, bitstream):
        '''
        Parse the given record and update properties accordingly
        '''
        record = cls()

        # Convert to ConstBitStream (if not already provided)
        if not isinstance(bitstream, ConstBitStream):
            if isinstance(bitstream, Bits):
                bitstream = ConstBitStream(auto=bitstream)
            else:
                bitstream = ConstBitStream(bytes=bitstream)

        # Read the record TTL
        record.ttl = bitstream.read('uint:32')

        # Store the locator record count until we need it
        locator_record_count = bitstream.read('uint:8')

        # Store the EID prefix mask length until we need it
        eid_prefix_len = bitstream.read('uint:8')

        # Read the Negative Map_Reply action
        record.action = bitstream.read('uint:3')

        # Read the flag
        record.authoritative = bitstream.read('bool')

        # Read reserved bits
        record._reserved1 = bitstream.read(12 + 4)

        # Read the map version
        record.map_version = bitstream.read('uint:12')

        # Read the EID prefix
        record.eid_prefix = read_afi_address_from_bitstream(bitstream,
                                                            eid_prefix_len)

        # Read the locator records
        for dummy in range(locator_record_count):
            locator_record = LocatorRecord.from_bytes(bitstream)
            record.locator_records.append(locator_record)

        # Verify that the properties make sense
        record.sanitize()

        return record