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OK: How about this:

$ cat testMD5.pl use strict; foreach my $url(qw@ /index.html /about/time.html @){ hashit($url); } sub hashit { my $url=shift; my @ltrs=split(//,$url); my $hash = 0; foreach my $ltr(@ltrs){ $hash = ( $hash + ord($ltr)) %10000; } printf "%s: %0.4d\n",$url,$hash }
which yields:
$ perl testMD5.pl /index.html: 1066 /about/time.html: 1547
Keep in mind this is hardly bullet proof. You need to also keep in mind a method to detect hash collisions and and a rehash algorithm.

This brings to mind "the old days" circa 1974 writing assemblers for 8080 microprocessors. Symbol "folding" and hashing.

UPDATE: Limiting yourself to four digits may not be very useful if you have a lot of pages that you are trying to index into your database. The wider your hash is the less likely there will be hash collisions.


Peter L. Berghold -- Unix Professional
Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg

In reply to Re^3: Using filepath method to identify an .html page by blue_cowdawg
in thread Using filepath method to identify an .html page by Nik

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