#?-*-?coding:?cp936?-*-
import?sys
import?socket
import?getopt
import?time
import?struct?

import?Checksum
import?BasicSender

‘‘‘
This?is?an?unreliable?sender?class?that?reads?from?a?file?or?STDIN.
‘‘‘
class?UnreliableSender（BasicSender.BasicSender）:
????#?Handles?a?response?from?the?receiver.?
????def?handle_response（selfresponse_packet）:
????????if?Checksum.validate_checksum（response_packet）:
????????????print?“recvRP:?%s“?%?response_packet
????????else:
????????????print?“recv:?%s?<---?CHECKSUM?FAILED“?%?response_packet

????def?_split_message_seqno（self?messageRC）:
??????????pieces1?=?messageRC.split（‘|‘）
??????????msg_typeseqno?=?pieces1[0:2]
??????????return?seqno


????#?Handles?the?ack?seqno
????def?handle_ack（selfResponseACKseqnoSd）:
????????checkSeqnoSd?=?seqnoSd+1
????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????6420??2013-04-17?18:11??UnreliableSender?v4.0!.py

?????文件???????6420??2013-04-17?18:11??UnreliableSender?v4.1S.py

?????文件??????19968??2013-06-05?21:02??說明.doc

-----------?---------??----------?-----??----

????????????????32808????????????????????3