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package Digest::JHash; use strict; use warnings; require 5.008; require Exporter; require DynaLoader; use vars qw(@ISA @EXPORT_OK); @ISA = qw(Exporter DynaLoader); @EXPORT_OK = qw( jhash ); our $VERSION = '0.10'; bootstrap Digest::JHash $VERSION; 1; __END__ =head1 NAME Digest::JHash - Perl extension for 32 bit Jenkins Hashing Algorithm =head1 SYNOPSIS use Digest::JHash qw(jhash); $digest = jhash($data); # note that calling jhash() directly like this is the fastest way: $digest = Digest::JHash::jhash($data); =head1 DESCRIPTION The C<Digest::JHash> module allows you to use the fast JHash hashing algorithm developed by Bob Jenkins from within Perl programs. The algorithm takes as input a message of arbitrary length and produces as output a 32-bit "message digest" of the input in the form of an unsigned long integer. Call it a low calorie version of MD5 if you like. See http://burtleburtle.net/bob/hash/doobs.html for more information. =head1 FUNCTIONS =over 4 =item jhash($data) This function will calculate the JHash digest of the "message" in $data and return a 32 bit integer result (an unsigned long in the C) =back =head1 EXPORTS None by default but you can have the jhash() function if you ask nicely. See below for reasons not to use Exporter (it is slower than a direct call) =head1 SPEED NOTE If speed is a major issue it is roughly twice as fast to do call the jhash() function like Digest::JHash::jhash('message') than it is to import the jhash() method using Exporter so you can call it as simply jhash('message'). There is a short script that demonstrates the speed of different calling methods (direct, OO and Imported) in examples/oo_vs_func.pl =head1 AUTHORS The JHash implementation was written by Bob Jenkins <bob_jenkins [at] burtleburtle [dot] net>. This perl extension was written by Andrew Towers <mariofrog [at] bigpond [dot] com>. A few mods were added by James Freeman <airmedical [at] gmail [dot] com>). =head1 SEE ALSO http://burtleburtle.net/bob/hash/doobs.html =head1 LICENSE This package is free software and is provided "as is" without express or implied warranty. It may be used, redistributed and/or modified under the terms of the Artistic License 2.0. A copy is include in this distribution. =for stopwords JHash burtleburtle bigpond Jenkins =cut