08-15-2010
P and NP, as discussed in this proof, are not numbers, but collections of problems. P is the collection of problems that can be solved in polynomial time (in reference to it's complexity), while NP is the collection that can't be solved in that time. NP problems would be problems like
The Traveling Salesman or the
Knapsack Problem.
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LEARN ABOUT DEBIAN
mime::base64::urlsafe
MIME::Base64::URLSafe(3pm) User Contributed Perl Documentation MIME::Base64::URLSafe(3pm)
NAME
MIME::Base64::URLSafe - Perl version of Python's URL-safe base64 codec
SYNOPSIS
use MIME::Base64::URLSafe;
$encoded = urlsafe_b64encode('Alladdin: open sesame');
$decoded = urlsafe_b64decode($encoded);
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);
SEE ALSO
MIME::Base64
Fore more discussion on using base64 encoding in URL applications, see: http://en.wikipedia.org/wiki/Base64#URL_Applications
AUTHOR
Kazuho Oku <kazuho ___at___ labs.cybozu.co.jp>
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.
perl v5.8.8 2006-01-05 MIME::Base64::URLSafe(3pm)