NAME

Digest::ManberHash - a Perl package to calculate Manber Hashes

SYNOPSIS

use Digest::ManberHash;

$instance = Digest::ManberHash::new($maskbits, $prime, $charcount);

$hash1 = $instance->DoHash($filename1);
$hash2 = $instance->DoHash($filename2);

$similarity = $instance->Compare($hash1, $hash2);

DESCRIPTION

Initialization

Use Digest::ManberHash::new. Parameters:

maskbits

range 1 .. 30, default 11.

prime

range 3 .. 65537, default 7.

charcount

range 8 .. 32768, default 64.

For a detailed description please read http://citeseer.nj.nec.com/manber94finding.html.

Calculating hashes

$hash = $instance->DoHash($filename);

This gives an object, which has an hash of hash values stored within.

Comparing hashes

$similarity = $instance->Compare($hash1, $hash2);

This gives an value of 0.0 .. 1.0, depending on the similariness. Help wanted: The calculation could do better than now!!