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Re: Need XOR solution
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Re: Need XOR solution


  • Subject: Re: Need XOR solution
  • From: "Arthur J. Knapp" <email@hidden>
  • Date: Wed, 07 Aug 2002 11:27:38 -0400

> Subject: Re: Need XOR solution
> Date: Wed, 7 Aug 2002 09:40:05 +0100
> From: Nigel Garvey <email@hidden>

> You could use the brilliant "Fast ASCII" coverter from Arthur's script to
> get the number value of each byte, and XOR them together with this:

> on Xorify(n1, n2)
> set xor to 0
> repeat 8 times
> if n1 mod 2 is not equal to n2 mod 2 then set xor to xor + 256
> set n1 to n1 div 2
> set n2 to n2 div 2
> set xor to xor div 2
> end repeat

I suspected that there was a clever "math" way to go about it, though
it eluded me.

Note: That's "eludes", not "alludes", as was pointed out to me by
Malcolm Fitzgerald:

> An allusion to oneself is a type of reference isn't it? Did you mean
> elides (delete) or eludes (unhandled) ;-)

;-)


> This does 8-bit xor's; but it's easily adaptable to handle larger chunks.
> ...
> set addIn to (2 ^ bits)
> repeat bits times
> if n1 mod 2 is not equal to n2 mod 2 then set xor to xor + addIn


{ Arthur J. Knapp, of <http://www.STELLARViSIONs.com>
a r t h u r @ s t e l l a r v i s i o n s . c o m
}
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