NAME

Math::Base85 - Perl extension for base 85 numbers, as referenced by RFC 1924

SYNOPSIS

  use Math::Base85;

  $bigint = from_base85($number);
  $b85str = to_base85($bigint);

DESCRIPTION

RFC 1924 describes a compact, fixed-size representation of IPv6 addresses which uses a base 85 number system. This module handles some of the uglier details of it.

The base 85 numbers (from 0 to 84) are as follows:

    0..9 A..Z a..z ! # $ % & ( ) * + - ; < = > ? @ ^ _ ` { | } ~

At the moment, there's not much in this module. But it should be sufficient for the purposes of RFC 1924.

This module has a variable called $Math::Base85::base85_digits, which is a string containing the digits of the base 85 alphabet from lowest (0) to highest (~), in that order.

Additionally, the following two functions are defined for general use. (They will be exported upon request.)

from_base85

Parameters

A string composed of valid base 85 digits.

Returns

A Math::BigInt object representing the number.

to_base85

Parameters

A Math::BigInt object.

Returns

A string of base 85 digits representing the number.

AUTHORS

• Tony Monroe <tmonroe+perl@nog.net>

• Paul Cochrane <paul@liekut.de> (maintainer)

COPYRIGHT AND LICENSE

Copyright (c) 2001-2002, Tony Monroe <tmonroe+perl@nog.net>. All rights reserved. Copyright (c) 2017, Paul Cochrane <paul@liekut.de>. All rights reserved.

You may use this software under the same terms as Perl itself.

SEE ALSO

perl(1).