Path: utzoo!attcan!ncrcan!aimed!nick
From: nick@aimed.UUCP (Nick Pemberton)
Newsgroups: comp.mail.uucp
Subject: Re: UUCP checksumming
Message-ID: <7620@aimed.UUCP>
Date: 8 Sep 89 17:51:23 GMT
References: <14192@polyslo.CalPoly.EDU>
Reply-To: nick@aimed.UUCP (Nick Pemberton)
Organization: AIM Inc, Toronto, Ontario, Canada
Lines: 27

In article <14192@polyslo.CalPoly.EDU> cambler@polyslo.CalPoly.EDU (Fubar Guru) writes:
>obviously, 42 != 63, and 107 != 0... so, when i run this through the
>checksum validator, it comes up false. Does anyone know what i'm doing
>wrong? Is there some magic value i should be using? should i ignore the
>checksum on control packets if the xor check is ok? Haaaaalp!! :-)


When I wrote uucp for PICK, I used the following method:

get envelope.
do XOR framing check.
IF Data_required THEN
   get data pack
   do checksum

Thus, the framing is always checked, and the checksum is ignored whenever
a control packet is received.

Whenever I generate a control packet, a place zeros in the checksum.

Hope this helps.

Nick
-- 
Nick Pemberton  		 uucp: !{lsuc, uunet!mnetor}!aimed!nick
AIM, Inc			  bus: (416) 429-1085
Toronto, Ontario, Canada         Home: (416) 690-0647