On Apr 13, 2012, at 11:23 PM, Paddy Byers wrote:
> Or more simply:
>
> var buf = new Buffer(asciiString);
> var sum = 0;
> for(var i=0; i<buf.length; i++) {
> sum -= buf[i];
> }
> sum = sum&0xff;
> return sum.toString(16).toUpperCase();
Yeah, cool, that's the best !
function calcChecksum(asciiString) {
var sum= 0;
var i= asciiString.length;
while (i--) sum-= asciiString.charCodeAt(i);
return ((sum&= 0xff) < 16 ? '0' : '')+ sum.toString(16).toUpperCase();
}
calcChecksum('09sw13100')
-> "B8"
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Jorge.
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