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Dir : ~/lib/python3/dist-packages/twisted/pair/

Edit File: rawudp.py

# -*- test-case-name: twisted.pair.test.test_rawudp -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Implementation of raw packet interfaces for UDP
"""

import struct

from twisted.internet import protocol
from twisted.pair import raw
from zope.interface import implementer

class UDPHeader:
    def __init__(self, data):

(self.source, self.dest, self.len, self.check) \
                 = struct.unpack("!HHHH", data[:8])

@implementer(raw.IRawDatagramProtocol)
class RawUDPProtocol(protocol.AbstractDatagramProtocol):
    def __init__(self):
        self.udpProtos = {}

def addProto(self, num, proto):
        if not isinstance(proto, protocol.DatagramProtocol):
            raise TypeError('Added protocol must be an instance of DatagramProtocol')
        if num < 0:
            raise TypeError('Added protocol must be positive or zero')
        if num >= 2**16:
            raise TypeError('Added protocol must fit in 16 bits')
        if num not in self.udpProtos:
            self.udpProtos[num] = []
        self.udpProtos[num].append(proto)

def datagramReceived(self,
                         data,
                         partial,
                         source,
                         dest,
                         protocol,
                         version,
                         ihl,
                         tos,
                         tot_len,
                         fragment_id,
                         fragment_offset,
                         dont_fragment,
                         more_fragments,
                         ttl):
        header = UDPHeader(data)
        for proto in self.udpProtos.get(header.dest, ()):
            proto.datagramReceived(data[8:],
                                   (source, header.source))