Convert::BaseN(3) encoding and decoding of base{2,4,8,16,32,64} strings

VERSION

$Id: BaseN.pm,v 0.1 2008/06/16 17:34:27 dankogai Exp dankogai $

SYNOPSIS


use Convert::BaseN;
# by name
my $cb = Convert::BaseN->new('base64');
my $cb = Convert::BaseN->new( name => 'base64' );
# or base
my $cb = Convert::BaseN->new( base => 64 );
my $cb_url = Convert::BaseN->new(
base => 64,
chars => '0-9A-Za-z\-_='
);
# encode and decode
$encoded = $cb->encode($data);
$decoded = $cb->decode($encoded);

EXPORT

Nothing. Instead of that, this module builds transcoder object for you and you use its "decode" and "encode" methods to get the job done.

FUNCTIONS

new

Create the transcoder object. 

  # by name
  my $cb = Convert::BaseN->new('base64');
  my $cb = Convert::BaseN->new( name => 'base64' );
  # or base
  my $cb = Convert::BaseN->new( base => 64 );
  my $cb_url = Convert::BaseN->new(
    base  => 64,
    chars => '0-9A-Za-z\-_=' 
  );

You can pick the decoder by name or create your own by specifying base and character map.

base
Must be 2, 4, 16, 32 or 64.
chars
Specifiles the character map. The format is the same as "tr". 

  # DNA is coded that way.
  my $dna = Convert::BaseN->new( base => 4, chars => 'ACGT' );
padding
nopadding
Specifies if padding (adding '=' or other chars) is required when encoding. default is yes. 

  # url-safe Base64
  my $b64url = Convert::BaseN->new( 
    base => 64, chars => '0-9A-Za-z\-_=', padding => 0;
  );
name
When specified, the following pre-defined encodings will be used.
base2
base 2 encoding. "perl" is 01110000011001010111001001101100.
base4
DNA
RNA
base 4 encodings. "perl" is: 

  base4: 1300121113021230
  DNA:   CTAACGCCCTAGCGTA
  RNA:   GAUUGCGGGAUCGCAU

base 16 encoding. "perl" is "7065726c".

base32
base32hex
base 32 encoding mentioned in RFC4648. "perl" is: 

  base32:    OBSXE3A==
  base32hex: E1IN4R0==
base64
base64_url
base64_imap
base64_ircu
base 64 encoding, as in MIME::Base64. They differ only in characters to represent number 62 and 63 as follows. 

  base64:        +/
  base64_url:    -_
  base64_imap:   +,
  base64_ircu:   []

for all predefined base 64 variants, "decode" accept ANY form of those.

decode

Does decode 

  my $decoded = $cb->decode($data)

encode

Does encode. 

  # line folds every 76 octets, like MIME::Base64::encode
  my $encoded = $cb->encode($data);
  # no line folding (compatibile w/ MIME::Base64)
  my $encoded = $cb->encode($data, "");
  # line folding by CRLF, every 40 octets
  my $encoded = $cb->encode($data, "\r\n", 40);

AUTHOR

Dan Kogai, "<dankogai at dan.co.jp>"

BUGS

Please report any bugs or feature requests to "bug-convert-basen at rt.cpan.org", or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Convert-BaseN>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command. 

    perldoc Convert::BaseN

You can also look for information at:

ACKNOWLEDGEMENTS

N/A

COPYRIGHT & LICENSE

Copyright 2008 Dan Kogai, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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