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lib/Algorithm/CheckDigits/M16_001.pm  view on Meta::CPAN

package Algorithm::CheckDigits::M16_001;

use 5.006;
use strict;
use warnings;
use integer;

use version; our $VERSION = 'v1.3.6';

our @ISA = qw(Algorithm::CheckDigits);

sub new {
	my $proto = shift;
	my $type  = shift;
	my $class = ref($proto) || $proto;
	my $self  = bless({}, $class);
	$self->{type} = lc($type);
	return $self;
} # new()

sub is_valid {
	my ($self,$number) = @_;
	if ($number =~ /^([0-9a-f]{15})([0-9a-f])$/i) {
		return $2 eq $self->_compute_checkdigit($1);
	}
	return ''
} # is_valid()

sub complete {
	my ($self,$number) = @_;
	if ($number =~ /^[0-9a-f]{15}$/i) {
		return $number . $self->_compute_checkdigit($number);
	}
	return '';
} # complete()

sub basenumber {
	my ($self,$number) = @_;
	if ($number =~ /^([0-9a-f]{15})([0-9a-f])$/i) {
		return $1 if (uc($2) eq $self->_compute_checkdigit($1));
	}
	return '';
} # basenumber()

sub checkdigit {
	my ($self,$number) = @_;
	if ($number =~ /^([0-9a-f]{15})([0-9a-f])$/i) {
		return $2 if (uc($2) eq $self->_compute_checkdigit($1));
	}
	return '';
} # checkdigit()

sub _compute_checkdigit {
	my $self   = shift;
	my $number = shift;

	if ($number =~ /^[0-9a-f]{15}$/i) {
		my ($a,$b,$c);

		my @digits = split(//,$number);
		$a         = 16;

		for (my $i = 0; $i <= $#digits; $i++) {

			$b = ($a % 17) + hex($digits[$i]);
			$c = $b % 16;
			$c = 16 unless ($c);
			$a = 2 * $c;

		}
		return sprintf("%X",(17 - ($a % 17)) % 16);
	}
	return -1;
} # _compute_checkdigit()

# Preloaded methods go here.