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).