Marius Gavrilescu

NAME

Convert::Base91 - XS base91 encoding/decoding

SYNOPSIS

  use Convert::Base91 qw/encode_base91 decode_base91/;

  # procedural interface
  my $encoded = encode_base91 'some data';
  say $encoded; # qrLg,W;Hr%w
  my $decoded = decode_base91 $encoded;
  say $decoded; # some data


  # OO interface
  my $base91 = Convert::Base91->new;
  $base91->encode('some ');
  $base91->encode('data');
  my $enc = $base91->encode_end;
  say $enc; # qrLg,W;Hr%w

  $base91->decode('qrLg,');
  $base91->decode('W;Hr%w');
  my $dec = $base91->decode_end;
  say $dec; # some data

DESCRIPTION

Base91 is a method for encoding binary data as printable ASCII characters. Every two base91 characters (16 bits) encode 13 or 14 bits of actual data, thus the overhead is between 14% and 23%, an improvement over base64's overhead of 33%.

This module provides a procedural interface for encoding/decoding whole strings and an OO interface for encoding/decoding in chunks.

The encode_base91 and decode_base91 functions are available for export, but are not exported by default.

encode_base91 $binary_data

Takes a string containing arbitrary bytes and returns the base91 encoded data.

decode_base91 $base91_data

Takes a string containing base91 encoded data and returns the decoded string of arbitrary bytes. Any non-printable character in the input is silently ignored.

Convert::Base91->new

Create a new Convert::Base91 object to keep the state for a chunk encoding/decoding operation.

$base91->encode($data)

Submit the next chunk of arbitrary binary data to be encoded. Returns nothing.

$base91->encode_end

Signals that all chunks of data to be encoded have been submitted. Returns the base91 encoded data, and clears the state of the $base91 object so it may be used again (for either encoding or decoding).

$base91->decode($data)

Submit the next chunk of base91 data to be decoded. Returns nothing. Any non-printable character in the input is silently ignored.

$base91->decode_end

Signals that all chunks of data to be decoded have been submitted. Returns the decoded data, and clears the state of the $base91 object so it may be used again (for either encoding or decoding).

SEE ALSO

http://base91.sourceforge.net/

Convert::Ascii85 provides a constant-length encoding, at the cost of a larger overhead (25% for Ascii85, versus 33% for base64 and 14-23% for base91).

AUTHOR

Marius Gavrilescu, <marius@ieval.ro>

COPYRIGHT AND LICENSE

Copyright (C) 2017-2018 by Marius Gavrilescu

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.26.1 or, at your option, any later version of Perl 5 you may have available.