Hi all,
I'm trying to calculate the result of a string hash function in perl. I
need an explicit function, as the perl output is used to create a C
program, that will then use that very same hash function. Please, do not
direct me to perl's excellent hash handling. I know it's there. I use it
where applicable. This is not one of those cases.
The hash function I'm using is sdbm hash function
(http://www.cse.yorku.ca/~oz/hash.html). To calculate it, I need to
perform integer arithmetics, knowing full well it may overflow. It is
okay for it to overflow, as I only need the bottom 32 bits. In fact, my
code ANDs the result with 0xffffffff, to make sure that, on 64 bit
platforms, I only get the bottom 32 bits.
Here's the problem. When the integer gets too big, Perl replaces it with
MAXINT. On 64 bit platforms, that's not too bad - I can simply truncate
to 32 bits after each operation. On 32 bit platforms, I'm a bit at a
loss as to what to do.
Any suggestions on how to get the C integer semantics out of perl?
Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
http://www.lingnu.com
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