/usr/share/perl5/MIME/Base64/URLSafe.pm is in libmime-base64-urlsafe-perl 0.01-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | package MIME::Base64::URLSafe;
use strict;
use vars qw(@ISA @EXPORT $VERSION);
use MIME::Base64;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(urlsafe_b64encode urlsafe_b64decode);
$VERSION = '0.01';
sub encode ($) {
my $data = encode_base64($_[0], '');
$data =~ tr|+/=|\-_|d;
$data;
}
sub decode ($) {
my $data = $_[0];
# +/ should not be handled, so convert them to invalid chars
# also, remove spaces (\t..\r and SP) so as to calc padding len
$data =~ tr|\-_\t-\x0d |+/|d;
my $mod4 = length($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
decode_base64($data);
}
*urlsafe_b64encode = \&encode;
*urlsafe_b64decode = \&decode;
1;
__END__
=head1 NAME
MIME::Base64::URLSafe - Perl version of Python's URL-safe base64 codec
=head1 SYNOPSIS
use MIME::Base64::URLSafe;
$encoded = urlsafe_b64encode('Alladdin: open sesame');
$decoded = urlsafe_b64decode($encoded);
=head1 DESCRIPTION
This module is a perl version of python's URL-safe base64 encoder / decoder.
When embedding binary data in URL, it is preferable to use base64 encoding. However, two characters ('+' and '/') used in the standard base64 encoding have special meanings in URLs, often leading to re-encoding with URL-encoding, or worse, interoperability problems.
To overcome the problem, the module provides a variation of base64 codec compatible with python's urlsafe_b64encode / urlsafe_b64decode.
Modification rules from base64:
use '-' and '_' instead of '+' and '/'
no line feeds
no trailing equals (=)
The following functions are provided:
urlsafe_b64encode($str)
urlsafe_b64decode($str)
If you prefer not to import these routines to your namespace, you can call them as:
use MIME::Base64::URLSafe ();
$encoded = MIME::Base64::URLSafe::encode($decoded);
$decoded = MIME::Base64::URLSafe::decode($encoded);
=head1 SEE ALSO
L<MIME::Base64>
Fore more discussion on using base64 encoding in URL applications, see: http://en.wikipedia.org/wiki/Base64#URL_Applications
=head1 AUTHOR
Kazuho Oku E<lt>kazuho ___at___ labs.cybozu.co.jpE<gt>
Copyright (C) 2006 Cybozu Labs, Inc.
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.7 or,
at your option, any later version of Perl 5 you may have available.
=cut
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