NAME

       Net::IDN::Punycode - A Bootstring encoding of Unicode for IDNA (RFC 3492)

SYNOPSIS

         use Net::IDN::Punycode qw(:all);
         $punycode = encode_punycode($unicode);
         $unicode  = decode_punycode($punycode);

DESCRIPTION

       This module implements the Punycode encoding, and only the Punycode encoding.

       This module does not implement any other steps required for converting internationalised
       domain names (IDNs) to and from ASCII. In particular, it does not do any string
       preparation as specified by Nameprep/IDNA2008/PRECIS and does not add nor remove the ACE
       prefix ("xn--"). Thus, use Net::IDN::Encode if you want to convert domain names.

       Punycode is an instance of a more general algorithm called Bootstring, which allows
       strings composed from a small set of "basic" code points to uniquely represent any string
       of code points drawn from a larger set. Punycode is Bootstring with particular parameter
       values appropriate for IDNA.

WARNING

       You may be tempted to use this module directly and add/remove the ACE prefix ("xn--") in
       your code for performance reasons. Usually, this is not a good idea.  If you convert
       domain labels (or other strings) without proper prepration, you may end up with an ASCII
       encoding that is not interoperable or even poses security issues due to spoofing.

       Even if you think that your domain names are valid and already mapped to the correct form,
       this may not be true. For example, some environments might automatically convert your
       perfectly valiad domain names to a different but equivalent Unicode normalisation form
       (e.g., NFD instead of NFC), which already breaks IDNA.

FUNCTIONS

       No functions are exported by default. You can use the tag ":all" or import them
       individually.

       The following functions are available:

       encode_punycode($input)
           Encodes $input with Punycode and returns the result.

           This function will throw an exception on invalid/unencodable input.

       decode_punycode($input)
           Decodes $input with Punycode and returns the result.

           This function will throw an exception on invalid input.

AUTHORS

       Tatsuhiko Miyagawa <miyagawa@bulknews.net> (versions 0.01 to 0.02)

       Claus Faerber <CFAERBER@cpan.org> (versions 1.000 and higher)

LICENSE

       Copyright 2002-2004 Tatsuhiko Miyagawa <miyagawa@bulknews.net>

       Copyright 2007-2014 Claus Faerber <CFAERBER@cpan.org>

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

SEE ALSO

       RFC 3492 (<http://www.ietf.org/rfc/rfc3492.txt>), IETF::ACE, Convert::RACE