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Robert,

Can you tell us more? Do you know C? I'm sure there are any number of
libraries that could be ported and accessed in RPG by prototype.

I still wonder at the need for CRC checksums for a SOCKET application...
Seems redundant if TCP/IP is the underlying protocol...

-Eric

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Robert Upshall
Sent: Thursday, March 25, 2010 12:20 PM
To: RPG programming on the IBM i / System i
Subject: Re: Cyclic Redundancy Checking (CRC) in RPG

I working with a 3rd party socket interface and it is requiring a CRC
with each request I transmit. This is from their API docs:

CRC -16 generating polynomial: X16 + X15 + X13 + 1
Namely the binary value: 1101000000000001

Robert



DeLong, Eric wrote:
Sure, about 15 years ago for a zmodem application... This was
somewhat
common when we used dial-up over POTS. What is your application?

If intent is to ensure a transferred file is unchanged, you might be
better off with a standard like MD5 or SHA for checksum hash. Please
note that many communications interfaces make use of CRC algorithms
already, to ensure the integrity of data being transmitted. Also note
that there are dozens of different CRC algorithms, so you must be sure
to clarify the requirements.

-Eric

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Robert Upshall
Sent: Thursday, March 25, 2010 11:29 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Cyclic Redundancy Checking (CRC) in RPG

Has anybody ever done a Cyclic Redundancy Check (CRC) in RPG?

Robert






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