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List:       nsbasic-palmapi
Subject:    Re: [nsbasic-palmAPI] CRC-16 - Sample code...
From:       Manuel Fraguas <fraguas () seven ! com ! br>
Date:       2004-11-22 5:05:18
Message-ID: 6.0.1.1.2.20041122030515.01da1720 () pop3 ! seven ! com ! br
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Ok...

I'm trying your sample, using "ABCD1234" (and 0 as seed).
The result is a NEGATIVE number....   :(

Strange.... But I'm testing...

Thanks for your help, ok?

[]s,
Manuel Fraguas

At 22/11/2004 01:52 Monday, you wrote:

>Manuel,
>
> >One question: This calc is compatible with the old CRC calc,
> >used on DOS applications, for string validation?
>
>I have no idea.  The Palm OS docs simply state it uses the "table lookup
>method", but doesn't list the table of hex values used.  I suspect (but don't
>have any solid evidence) that the algorithm is the same, but coudn't guarantee
>the lookup tables are standardized.  My SWAG is that they should be, otherwise
>doing CRC checks in a multi-platform environment would be seemingly tough.
>
>I've not used them myself -- I was just answering your question on how to
>prototype the SysTrap from within NSB/Palm.  Based on the SDK docs, my answer
>should in theory do that.
>
>The SDK docs don't address how the CRC is calculated, so I can't give you any
>more definition information.
>
>If you are trying to match some historical data, I'd just run some tests 
>and see
>what you come up with.
>
>Doug



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