Graeme, why don't you use power of the FPC (and it's pointer maths)?
Pascal is language of readable code :)
procedure XorBlock(var InData1, InData2; Size: longword);
var
b1 : PByte; // in Delphi i'd use PByteArray
b2 ; PByte;
i: longword;
begin
b1:=...@indata1;
b2:=...@indata2;
for i:=0 to size-1 do
b1[i]:=b1[i] xor b2[i];
end;
But, since we're using 32-bit processors it's more effective to use
32-bit xor (where possible)!
thanks,
dmitry
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