RE: Cyclic Redundancy Checking (CRC) in RPG

["DeLong, Eric" <EDeLong@xxxxxxxxxxxxxxx>]

We'll we've stepped beyond my experience level with CRC's then... ;-)

I can only see one document in google that seems to fit, but it's in
chinese, and google translation feature might have mangled the embedded
source code...  

However, here's what looks to be an excellent document to get you
started...
http://www.ross.net/crc/download/crc_v3.txt

hth,
-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
>
>
>
>