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Newsgroups: comp.lang.ada
Subject: Re: Bitmanipulation in Ada
From: Bernd.Specht@gmx.com (Bernd Specht)
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Date: 19 Aug 2004 18:28:02 GMT
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Date: 2004-08-19T20:28:02+02:00
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"Martin Dowie" <martin.dowie@btopenworld.com> wrote in
news:cg2qcj$de0$1@titan.btinternet.com: 

> Bernd Specht wrote:
>> Always? What do you think about bitscrambling software which has to
>> treat data alternating as bitvector and as integer value in a loop
>> like this (not exeactly this for securitity reasons):
>>
>> ...
>> loop
>>   declare
>>     x : boolean;
>>   begin
>>      x := b(k);
>>      b(k) := b(32 - k);
>>      b (32 - k) := x;
>>      I := I * prime1 mod prime2;
>>   end;
>> end loop;
>>
>>
>> Can you find an equivalent algorithm where you can separate the
>> bit-ops and the integer-ops? 
> 
> Sorry, I'm missing something... Are "I" and "b" different views of the
> same address space?
> 


Sorry, I and b are as mentioned earlier: 

>> TYPE ov is record
>> case boolean of
>>   true : i : integer;
>>   false  : byte_array;
>> end;
>> end;