bgp.py 文件源码

def serialize(self):
        # fixup
        byte_length = (self.length + 7) // 8
        bin_addr = self._to_bin(self.addr)
        if (self.length % 8) == 0:
            bin_addr = bin_addr[:byte_length]
        else:
            # clear trailing bits in the last octet.
            # rfc doesn't require this.
            mask = 0xff00 >> (self.length % 8)
            last_byte = six.int2byte(
                six.indexbytes(bin_addr, byte_length - 1) & mask)
            bin_addr = bin_addr[:byte_length - 1] + last_byte
        self.addr = self._from_bin(bin_addr)

        buf = bytearray()
        msg_pack_into(self._PACK_STR, buf, 0, self.length)
        return buf + bytes(bin_addr)