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=head1 NAME

MIME::EcoEncode::Param - RFC 2231 Encode/Decode

=head1 SYNOPSIS

 use MIME::EcoEncode::Param;
 $encoded = mime_eco_param($str, 'UTF-8');       # encode utf8 string
 $encoded = mime_eco_param($str, "UTF-8'XX'");   # XX is language
 $encoded = mime_eco_param($str, 'UTF-8*XX?B');  # "B" encoding
 $encoded = mime_eco_param($str, 'UTF-8*XX?Q');  # "Q" encoding
 $encoded = mime_eco_param($str, 'GB2312');      # euc-cn string
 $encoded = mime_eco_param($str, 'EUC-KR');      # euc-kr string
 $encoded = mime_eco_param($str, 'Big5');        # big5 string
 $encoded = mime_eco_param($str, 'Shift_JIS');   # cp932 string
 $encoded = mime_eco_param($str, 'ISO-2022-JP'); # 7bit-jis string
 $encoded = mime_eco_param($str, $sbcs);         # $sbcs :
                                                 #   single-byte charset
                                                 #   (e.g. 'ISO-8859-1')

 $decoded = mime_deco_param($encoded);           # decode encoded string

 ($decoded, $param, $charset, $lang, $value)     # return array
          = mime_deco_param($encoded);

=head1 DESCRIPTION

This module implements RFC 2231 Mime Parameter Value Encoding.

=head2 Options

  $encoded = mime_eco_param($str, $charset, $lf, $bpl);
               # $charset : 'UTF-8' / "UTF-8'XX'" /
               #            'UTF-8*XX?B' / 'UTF-8*XX?Q' /
               #            'GB2312' / 'EUC-KR' / 'Big5' /
               #            'Shift_JIS' / 'ISO-2022-JP' / ...
               #            (default: 'UTF-8')
               #              Note: The others are all encoded as
               #                    single-byte string.
               # $lf      : line feed (default: "\n")
               # $bpl     : bytes per line (default: 76)

  $decoded = mime_deco_param($encoded, $bq_on);
               # $bq_on   : 1 : ON decode "B/Q" encoding
               #            0 : OFF
               #            (default: 1)

=head2 Examples

Ex1 - RFC 2231 encoding

  use MIME::EcoEncode::Param;
  my $str = " filename=\xe5\xaf\x8c\xe5\xa3\xab\xe5\xb1\xb1_2013.jpeg";
  print mime_eco_param($str, "UTF-8'ja'", "\n", 33), "\n";

Ex1's output:

   filename*0*=UTF-8'ja'%E5%AF%8C;
   filename*1*=%E5%A3%AB%E5%B1%B1_;
   filename*2=2013.jpeg

Ex2 - "Q" encoding (for Windows)

  use MIME::EcoEncode::Param;
  my $str = " name=\xe5\xaf\x8c\xe5\xa3\xab\xe5\xb1\xb1_2013.jpeg";
  print mime_eco_param($str, 'UTF-8?Q', "\n", 33), "\n";

Ex2's output:

   name="=?UTF-8?Q?=E5=AF=8C=E5?=
   =?UTF-8?Q?=A3=AB=E5=B1=B1=5F20?=
   =?UTF-8?Q?13.jpeg?="

Ex3 - "B" encoding (for Windows)

  use MIME::EcoEncode::Param;
  my $str = " name=\xe5\xaf\x8c\xe5\xa3\xab\xe5\xb1\xb1_2013.jpeg";
  print mime_eco_param($str, 'UTF-8?B', "\n", 33), "\n";

Ex3's output:

   name="=?UTF-8?B?5a+M5aOr5bGx?=
   =?UTF-8?B?XzIwMTMuanBlZw==?="

=head1 SEE ALSO

L<MIME::EcoEncode>

=head1 AUTHOR

MURATA Yasuhisa E<lt>murata@nips.ac.jpE<gt>

=head1 COPYRIGHT

Copyright (C) 2013 MURATA Yasuhisa

=head1 LICENSE

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

=cut