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.\" ========================================================================
.\"
.IX Title "Base85 3"
.TH Base85 3 "2002-08-07" "perl v5.16.3" "User Contributed Perl Documentation"
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.SH "NAME"
Math::Base85 \- Perl extension for base 85 numbers, as referenced by RFC 1924
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Math::Base85;
\&
\&  $bigint = from_base85($number);
\&  $b85str = to_base85($bigint);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1RFC 1924\s0 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.
.PP
The base 85 numbers (from 0 to 84) are as follows:
.PP
.Vb 1
\&    0..9 A..Z a..z ! # $ % & ( ) * + \- ; < = > ? @ ^ _ \` { | } ~
.Ve
.PP
At the moment, there's not much in this module.  But it should be
sufficient for the purposes of \s-1RFC 1924.\s0
.PP
This module has a variable called \f(CW$Math::Base85::base85_digits\fR,
which is a string containing the digits of the base 85 alphabet
from lowest (0) to highest (~), in that order.
.PP
Additionally, the following two functions are defined for general
use.  (They will be exported upon request.)
.SH "from_base85"
.IX Header "from_base85"
.SS "Parameters"
.IX Subsection "Parameters"
A string composed of valid base 85 digits.
.SS "Returns"
.IX Subsection "Returns"
A \f(CW\*(C`Math::BigInt\*(C'\fR object representing the number.
.SH "to_base85"
.IX Header "to_base85"
.SS "Parameters"
.IX Subsection "Parameters"
A \f(CW\*(C`Math::BigInt\*(C'\fR object.
.SS "Returns"
.IX Subsection "Returns"
A string of base 85 digits representing the number.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tony Monroe <tmonroe+perl@nog.net>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIperl\fR\|(1).