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package Algorithm::Nhash; |
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BEGIN { |
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$Algorithm::Nhash::DIST = 'Algorithm-Nhash'; |
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} |
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BEGIN { |
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$Algorithm::Nhash::VERSION = '0.002'; |
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} |
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# ABSTRACT: Exim nhash algorithm |
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use warnings; |
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use strict; |
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use Carp; |
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use vars qw( @ISA @EXPORT_OK ); |
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@ISA = qw( Exporter ); |
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@EXPORT_OK = qw( nhash ); |
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sub new { |
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my($class, @div) = @_; |
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return bless \@div, $class; |
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} |
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my @primes = qw( 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 |
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83 89 97 101 103 107 109 113); |
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sub nhash { |
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my($string, @div) = @_; |
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100
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if (ref $string) { # called as a method |
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# $string is actually $self |
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($string, @div) = ($div[0], @$string); |
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} |
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#warn "'$string' @div"; |
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my($sum, $i); |
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foreach my $val (split //, $string) { |
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$i += 28; $i %= 29; |
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$sum += $primes[$i] * ord($val); |
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} |
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100
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return $sum unless @div; |
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my @ret; |
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while (my $div = pop @div) { |
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unshift @ret, $sum % $div; |
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$sum = int($sum / $div); |
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} |
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100
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return wantarray ? @ret : join '/', @ret; |
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} |
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1; |
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__END__ |