Message/MIME/Charset.pm


=head1 NAME

Message::MIME::Charset Perl module

=head1 DESCRIPTION

Perl module for MIME charset.

=cut

## NOTE: You should not require/use other module (even it
##       is part of Message::* Perl Modules) as far as possible,
##       to be able to use this module (M::M::Charset) from
##       other (non-Message::*) modules.

package Message::MIME::Charset;
use strict;
use vars qw(%CHARSET %MSNAME2IANANAME %REG $VERSION);
$VERSION=do{my @r=(q$Revision: 1.15 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};

&_builtin_charset;
sub _builtin_charset () {

$CHARSET{'*DEFAULT'} = {
        preferred_name  => '',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 1,   ## Suitability in use as MIME text/* charset
        #accept_cte     => [qw/7bit .../],
        cte_7bit_preferred      => 'quoted-printable',
};
$CHARSET{'*default'} = $CHARSET{'*DEFAULT'};

$CHARSET{'us-ascii'} = {
        preferred_name  => 'us-ascii',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 1,
        cte_7bit_preferred      => 'quoted-printable',
};

$CHARSET{'iso-2022-int-1'} = {
        preferred_name  => 'iso-2022-int-1',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 1,
};

$CHARSET{'unknown-8bit'} = {
        preferred_name  => 'unknown-8bit',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 1,
        cte_7bit_preferred      => 'base64',
};

$CHARSET{'x-unknown'} = {
        preferred_name  => 'x-unknown',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 0,
        cte_7bit_preferred      => 'base64',
};

$CHARSET{'*undef'} = {
        preferred_name  => '',
        
        #encoder        => sub { $_[1] },
        #decoder        => sub { $_[1] },
        
        mime_text       => 0,
        cte_7bit_preferred      => 'base64',
};

}       # /builtin_charset

my %_MINIMUMIZER = (
        'euc-jp'        => \&_name_euc_japan,
        'euc-jisx0213'  => \&_name_euc_japan,
        'euc-jisx0213-plane1'   => \&_name_euc_japan,
        'x-euc-jisx0213-packed' => \&_name_euc_japan,
        'x-iso-2022'    => \&_name_8bit_iso2022,
        'iso-2022-cn'   => \&_name_8bit_iso2022,
        'iso-2022-cn-ext'       => \&_name_8bit_iso2022,
        'iso-2022-int-1'        => \&_name_net_ascii_8bit,
        'iso-2022-jp'   => \&_name_8bit_iso2022,
        'iso-2022-jp-1' => \&_name_8bit_iso2022,
        'iso-2022-jp-2' => \&_name_8bit_iso2022,
        'iso-2022-jp-3' => \&_name_8bit_iso2022,
        'iso-2022-jp-3-plane1'  => \&_name_8bit_iso2022,
        'iso-2022-kr'   => \&_name_8bit_iso2022,
        'iso-8859-1'    => \&_name_8bit_iso2022,
        'iso-10646-j-1' => \&_name_utf16be,
        'iso-10646-ucs-2'       => \&_name_utf16be,
        'iso-10646-ucs-4'       => \&_name_utf32be,
        'iso-10646-ucs-basic'   => \&_name_utf16be,
        'iso-10646-unicode-latin1'      => \&_name_utf16be,
        jis_x0201       => \&_name_shift_jis,
        junet   => \&_name_8bit_iso2022,
        'x-junet8'      => \&_name_net_ascii_8bit,
        shift_jis       => \&_name_shift_jis,
        shift_jisx0213  => \&_name_shift_jis,
        'shift_jisx0213-plane1' => \&_name_shift_jis,
        'x-sjis'        => \&_name_shift_jis,
        'us-ascii'      => \&_name_net_ascii_8bit,
        'utf-8' => \&_name_net_ascii_8bit,
        'utf-16be'      => \&_name_utf16be,
        'utf-32be'      => \&_name_utf32be,
);

my %_IsMimeText;
for (qw(
        adobe-standard-encoding adobe-symbol-encoding
        big5    big5-eten       big5-hkscs
        cp950
        gbk     gb18030
        euc-jp  euc-jisx0213    euc-kr  euc-tw
        hp-roman8
        hz-gb-2312
        ibm437
        junet   x-junet8        x-iso-2022
        iso-2022-cn     iso-2022-cn-ext
        iso-2022-int-1
        iso-2022-jp     iso-2022-jp-1   iso-2022-jp-2   iso-2022-jp-3
        x-iso2022jp-cp932
        iso-2022-kr
        iso-8859-1      iso-8859-2      iso-8859-3
        iso-8859-4      iso-8859-5      iso-8859-6
        iso-8859-7      iso-8859-8      iso-8859-9
        iso-8859-10     iso-8859-12     iso-8859-13
        iso-8859-14     iso-8859-15     iso-8859-16
        jis_encoding
        koi8-r  koi8-u
        x-mac-arabic    x-mac-centralroman      x-mac-cyrillic  x-mac-greek
        x-mac-hebrew    x-mac-icelandic macintosh       x-mac-turkish
        x-mac-ukrainian x-mac-chinesesimp       x-mac-japanese  x-mac-korean
        shift_jis       shift_jisx0213  x-sjis
        tis-620
        unicode-1-1-utf-7       unicode-1-1-utf-8
        unicode-2-0-utf-7       unicode-2-0-utf-8
        utf-7   utf-8   utf-9
        viscii
        windows-1250    windows-1251    windows-1252    windows-1253
        windows-1254    windows-1255    windows-1256    windows-1257
        windows-1258    windows-31j     windows-949
)) { $_IsMimeText{$_} = 1 }

%MSNAME2IANANAME = (
        'iso-2022-jp'   => 'x-iso2022jp-cp932',
        'ks_c_5601-1987'        => 'windows-949',
);

sub make_charset ($%) {
  my $name = shift;
  return unless $name;  ## Note: charset "0" is not supported.
  my %definition = @_;
  
  $definition{preferred_name} ||= $name;
  if ($definition{preferred_name} ne $name
      && ref $CHARSET{$definition{preferred_name}}) {
  ## New charset is an alias of defined charset,
    $CHARSET{$name} = $CHARSET{$definition{preferred_name}};
    return;
  } elsif ($definition{alias_of} && ref $CHARSET{$definition{alias_of}}) {
  ## New charset is an alias of defined charset,
    $CHARSET{$name} = $CHARSET{$definition{alias_of}};
    return;
  }
  $CHARSET{$name} = \%definition;
  
  ## Set default values
  #$definition{encoder} ||= sub { $_[1] };
  #$definition{decoder} ||= sub { $_[1] };

  $definition{mime_text} = 0 unless defined $definition{mime_text};
  $definition{cte_7bit_preferred} = 'base64'
    unless defined $definition{cte_7bit_preferred};
}

sub encode ($$) {
  my ($charset, $s) = (lc shift, shift);
  my $c = ref $CHARSET{$charset}->{encoder}? $charset: '*undef';
  if (ref $CHARSET{$c}->{encoder}) {
    my ($t, %r) = &{$CHARSET{$c}->{encoder}} ($charset, $s);
    unless (defined $r{success}) {
      $r{success} = 1;
    }
    return ($t, %r);
  }
  ($s, success => 0);
}

sub decode ($$) {
  my ($charset, $s) = (lc shift, shift);
  my $c = ref $CHARSET{$charset}->{decoder}? $charset: '*undef';
  if (ref $CHARSET{$c}->{decoder}) {
    my ($t, %r) = &{$CHARSET{$c}->{decoder}} ($charset, $s);
    unless (defined $r{success}) {
      $r{success} = 1;
    }
    return ($t, %r);
  }
  ($s, success => 0);
}

sub name_normalize ($) {
  my $name = lc shift;
  if (ref $CHARSET{$name}->{preferred_name} eq 'CODE') {
    return &{ $CHARSET{$name}->{preferred_name} } ($name);
  } elsif ($CHARSET{$name}->{preferred_name}) {
    return $CHARSET{$name}->{preferred_name};
  } elsif (ref $CHARSET{'*undef'}->{preferred_name} eq 'CODE') {
    return &{ $CHARSET{'*undef'}->{preferred_name} } ($name);
  }
  $name;
}

sub name_minimumize ($$) {
  my ($charset, $s) = (lc shift, shift);
  if (ref $CHARSET{$charset}->{name_minimumizer} eq 'CODE') {
    return &{$CHARSET{$charset}->{name_minimumizer}} ($charset, $s);
  } elsif (ref $_MINIMUMIZER{$charset}) {
    return &{$_MINIMUMIZER{$charset}} ($charset, $s);
  } elsif (ref $CHARSET{'*undef'}->{name_minimumizer} eq 'CODE') {
    return &{$CHARSET{'*undef'}->{name_minimumizer}} ($charset, $s);
  }
  (charset => $charset);
}

sub msname2iananame ($) {
  my $mscharset = shift;
  $MSNAME2IANANAME{$mscharset} || $mscharset;
}

sub _name_7bit_iso2022 ($$) {shift;
  my $s = shift;
  if ($s =~ /[\x0E\x0F\x1B]/) {
    return (charset => 'iso-2022-jp')
      unless $s =~ /\x1B[^\x24\x28]
                   |\x1B\x24[^\x40B]
                   |\x1B\x28[^BJ]
                   |\x0E|\x0F/x;
    return (charset => 'iso-2022-jp-1')
      unless $s =~ /\x1B[^\x24\x28]
                   |\x1B\x24[^\x40B\x28]
                   |\x1B\x24\x28[^D]
                   |\x1B\x28[^BJ]
                   |\x0E|\x0F/x;
    return (charset => 'iso-2022-jp-3-plane1')
      unless $s =~ /\x1B[^\x24\x28]
                   |\x1B\x24[^\x28]     #[^B\x28]
                   |\x1B\x24\x28[^O]
                   |\x1B\x28[^B]
                   |\x0E|\x0F/x;
    return (charset => 'iso-2022-jp-3')
      unless $s =~ /\x1B[^\x24\x28]
                   |\x1B\x24[^\x28]     #[^B\x28]
                   |\x1B\x24\x28[^OP]
                   |\x1B\x28[^B]
                   |\x0E|\x0F/x;
    return (charset => 'iso-2022-kr')
      unless $s =~ /\x1B[^\x24]
                   |\x1B\x24[^\x29]
                   |\x1B\x24\x29[^C]/x;
    return (charset => 'iso-2022-jp-2')
      unless $s =~ /\x1B[^\x24\x28\x2E\x4E]
                   |\x1B\x24[^\x40AB\x28]
                   |\x1B\x24\x28[^CD]
                   |\x1B\x28[^BJ]
                   |\x1B\x2E[^AF]
                   |\x0E|\x0F/x;
    return (charset => 'iso-2022-cn')
      unless $s =~ /\x1B[^\x4E\x24]
                   |\x1B\x24[^\x29\x2A]
                   |\x1B\x24\x29[^AG]
                   |\x1B\x24\x2A[^H]/x;
    return (charset => 'iso-2022-cn-ext')
      unless $s =~ /\x1B[^\x4E\x4F\x24]
                   |\x1B\x24[^\x29\x2A]
                   |\x1B\x24\x29[^AEG]
                   |\x1B\x24\x2A[^HIJKLM]/x;
    return (charset => 'iso-2022-int-1')
      unless $s =~ /\x1B[^\x24\x28\x2D]
                   |\x1B\x24[^\x40AB\x28\x29]
                   |\x1B\x24\x28[^DGH]
                   |\x1B\x24\x29[^C]
                   |\x1B\x28[^BJ]
                   |\x1B\x2D[^AF]/x;
    return (charset => 'junet')
      unless $s =~ /\x1B[^\x24\x28\x2C]
                   |\x1B\x24[^\x28\x2C\x40-\x42]
                   |\x1B\x24[\x28\x2C][^\x20-\x7E]
                   |\x1B\x24[\x28\x2C][\x20-\x2F]+[^\x30-\x7E]
                   |\x1B[\x28\x2C][^\x20-\x7E]
                   |\x1B[\x28\x2C][\x20-\x2F]+[^\x30-\x7E]
                   |\x0E|\x0F/x;
    return (charset => 'x-iso-2022');
  } else {
    return (charset => 'us-ascii');
  }
}

sub _name_net_ascii_8bit ($) {
  my $name = shift; my $s = shift;
  return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F\x80-\xFF]/;
  if ($s =~ /[\x80-\xFF]/) {
    if ($s =~ /[\xC0-\xFD][\x80-\xBF]*[\x80-\x8F]/) {
      if ($s =~ /\x1B/) {
        return (charset => 'x-junet8'); ## junet + UTF-8
      } else {
        return (charset => 'utf-8');
      }
    } elsif ($s =~ /\x1B/) {
      return (charset => 'x-iso-2022'); ## 8bit ISO 2022
    } else {
      return (charset => 'iso-8859-1');
    }
  } else {      ## 7bit ISO 2022
    return _name_7bit_iso2022 ($name, $s);
  }
}

sub _name_8bit_iso2022 ($$) {
  my $name = shift; my $s = shift;
  return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F\x80-\xFF]/;
  if ($s =~ /[\x80-\xFF]/) {
    if ($s =~ /\x1B/) {
      return (charset => 'x-iso-2022'); ## 8bit ISO 2022
    } else {
      return (charset => 'iso-8859-1');
    }
  } else {      ## 7bit ISO 2022
    return _name_7bit_iso2022 ($name, $s);
  }
}

## Not completed.
## TODO: gb18030, cn-gb-12345
## TODO: _name_euc_gbf (cn-gb-12345, gb2312)
sub _name_euc_gb ($$) {
  my $name = shift; my $s = shift;
  if ($s =~ /[\x80-\xFF]/) {
    if ($s =~ /
                  (?:\G|[\x00-\x3F\x7F\x80\xFF])
                  (?:[\xA1-\xA9\xB0-\xFE][\xA1-\xFE]
                    |[\x40-\x7E])*
        (?:
          [\x81-\xA0\xAA-\xAF][\x40-\xFE]
         |[\xA1-\xFE][\x40-\xA0]
        )
      /x) {
      (charset => 'gbk');
    } elsif ($s =~ /
        (?:\xA2[\xA1-\xAA]
          |\xA6[\xE0-\xF5]
          |\xA8[\xBB-\xC0]
        )
          (?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]|\z))
      /x) {
      (charset => 'gbk');
    } elsif ($s =~ /
        (?:\xA3\xE7|\xA7[\xDD-\xF2]
          |\xA8[\xBB-\xC0]
          |[\xAA-\xAF\xF8-\xFE][\xA1-\xFE]
        )
          (?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]|\z))
      /x) {
      (charset => 'cn-gb-isoir165', 'charset-edition' => 1992);
    } elsif ($s =~ /\xEF\xF1    ## Typo bug of GB 2312
          (?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]|\z))
      /x) {
      (charset => 'gb2312');
    } else {
      (charset => 'gb2312', 'charset-edition' => 1980);
    }
  } elsif ($s =~ /[\x0E\x0F]/) {
    (charset => 'gb2312');      ## Actually, this is not "gb2312"
  } else {
    _name_7bit_iso2022 ($name, $s);
  }
}

sub _name_euc_japan ($$) {
  my $name = shift; my $s = shift;
  if ($s =~ /[\x80-\xFF]/) {
    if ($s =~ /\x8F[\xA1\xA3-\xA5\xA8\xAC-\xAF\xEE-\xFE][\xA1-\xFE]/) {
      if ($s =~ /\x8F[\xA2\xA6\xA7\xA9-\xAB\xB0-\xED][\xA1-\xFE]/) {
      ## JIS X 0213 plane 2 + JIS X 0212
        (charset => 'x-euc-jisx0213-packed');
      } else {
        (charset => 'euc-jisx0213');
      }
    } elsif ($s =~ m{(?<![\x8E\x8F])    ## Not G2/G3 character
                    (?: ## JIS X 0213:2000
                       [\xA9-\xAF\xF5-\xFE][\xA1-\xFE]
                      |\xA2[\xAF-\xB9\xC2-\xC9\xD1-\xDB\xE9-\xF1\xFA-\xFD]
                      |\xA3[\xA1-\xAF\xBA-\xC0\xDB-\xE0\xFB-\xFE]
                      |\xA4[\xF4-\xFE]|\xA5[\xF7-\xFE]
                      |\xA6[\xB9-\xC0\xD9-\xFE]|\xA7[\xC2-\xD0\xF2-\xFE]
                      |\xA8[\xC1-\xFE]|\xCF[\xD4-\xFE]|\xF4[\xA7-\xFE]
                    )
                    (?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]|\z))}x) {
      if ($s =~ /\x8F/) {       ## JIS X 0213 plane 1 + JIS X 0212
        (charset => 'x-euc-jisx0213-packed');
      } else {
        (charset => 'euc-jisx0213-plane1');
      }
    } else {
      (charset => 'euc-jp');
    }
  } elsif ($s =~ /\x0E|\x0F|\x1B[\x4E\x4F]/) {
    (charset => 'euc-jisx0213');        ## Actually, this is not euc-japan
  } else {
    _name_7bit_iso2022 ($name, $s);
  }
}

sub _name_shift_jis ($$) {
  my $name = shift; my $s = shift;
  if ($s =~ /[\x80-\xFF]/) {
    if ($s =~ /[\x0E\x0F\x1B]/) {
      (charset => 'x-sjis');
    } elsif ($s =~ /
                  (?:\G|[\x00-\x3F\x7F])
                  (?:[\x81-\x9F\xE0-\xFC][\x40-\x7E\x80-\xFC]
                    |[\x40-\x7E\xA1-\xDF])*
               [\xF0-\xFC][\x40-\x7E\x80-\xFC]
      /x) {
      (charset => 'shift_jisx0213');
    } elsif ($s =~ /
                  (?:\G|[\x00-\x3F\x7F])
                  (?:[\x81-\x9F\xE0-\xFC][\x40-\x7E\x80-\xFC]
                    |[\x40-\x7E\xA1-\xDF])*
              (?:
               [\x85-\x87\xEB-\xEF][\x40-\x7E\x80-\xFC]
              |\x81[\xAD-\xB7\xC0-\xC7\xCF-\xD9\xE9-\xEF\xF8-\xFB]
              |\x82[\x40-\x4E\x59-\x5F\x7A-\x80\x9B-\x9E\xF2-\xFC]
              |\x83[\x97-\x9E\xB7-\xBE\xD7-\xFC]
              |\x84[\x61-\x6F\x72-\x9E\xBF-\xFC]
              |\x88[\x40-\x9E]|\x98[\x73-\x9E]|\xEA[\xA5-\xFC]
              )
    /x) {
      (charset => 'shift_jisx0213-plane1');
    } else {
      (charset => 'shift_jis');
    }
  } elsif ($s =~ /[\x5C\x7E]/) {
    if ($s =~ /\x1B\x0E\x0F/) {
      (charset => 'x-sjis');    ## ISO 2022 with implied "ESC ( J"
        ## BUG: "ESC ( B foobar\aaa ESC ( J aiueo" also matchs this
    } else {
      (charset => 'jis_x0201');
    }
  } else {
    _name_7bit_iso2022 ($name, $s);
  }
}

sub _name_utf16be ($$) {
  shift; my $s = shift;
  if ($s =~ /[\xD8-\xDB][\x00-\xFF][\xDC-\xDF][\x00-\xFF]
             (?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
    (charset => 'utf-16be');
  } elsif ($s =~ /[\x01-\xFF][\x00-\xFF]
             (?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
    if ($s =~ /([^\x00\x03\x04\x23\x25\x30\xFE\xFF]
                     [\x00-\xFF]        # ^\x20\x22\x4E-\x9F\xF9\xFA
                  |\x03[^\x00-\x6F\xD0-\xFF]
                  #|\x20[^\x00-\x6F]
                  |\x25[^\x00-\x7F]
                  |\xFE[^\x30-\x4F]
                  |\xFF[^\x00-\xEF]
                  ## note 1 of RFC 1816 is ambitious, so block entire
                  ## is excepted
                    |\x30[\x00-\x3F]
                  )
             (?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
      (charset => 'iso-10646-ucs-2');
    } else {
      (charset => 'iso-10646-j-1');
    }
  } elsif ($s =~ /\x00[\x80-\xFF]
             (?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
    (charset => 'iso-10646-unicode-latin1');
  } else {
    (charset => 'iso-10646-ucs-basic');
  }
}

sub _name_utf32be ($$) {
  shift; my $s = shift;
  if ($s =~ /
    ([\x01-\x7F][\x00-\xFF]{3}
    |\x00[\x11-\xFF][\x00-\xFF][\x00-\xFF])
             (?=(?:[\x00-\xFF]{4})*\z)/sx) {
    (charset => 'iso-10646-ucs-4');
  } else {
    (charset => 'utf-32be');
  }
}

sub _utf8_on ($) {
  Encode::_utf8_on ($_[0]) if $Encode::VERSION;
}
sub _utf8_off ($) {
  Encode::_utf8_off ($_[0]) if $Encode::VERSION;
}

sub is_mime_text ($) {
  my $name = lc shift;
  if (ref $CHARSET{$name}->{mime_text} eq 'CODE') {
    return &{ $CHARSET{$name}->{mime_text} } ($name);
  } elsif (defined $CHARSET{$name}->{mime_text}) {
    return $CHARSET{$name}->{mime_text};
  } elsif (defined $_IsMimeText{$name}) {
    return $_IsMimeText{$name};
  } elsif (ref $CHARSET{'*undef'}->{mime_text} eq 'CODE') {
    return &{ $CHARSET{'*undef'}->{mime_text} } ($name);
  }
  0;
}

=head1 LICENSE

Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

=head1 CHANGE

See F<ChangeLog>.
$Date: 2002/07/26 12:42:00 $

=cut

1;
1	wakaba	1.1
2			=head1 NAME
3
4			Message::MIME::Charset Perl module
5
6			=head1 DESCRIPTION
7
8			Perl module for MIME charset.
9
10			=cut
11
12	wakaba	1.10	## NOTE: You should not require/use other module (even it
13			## is part of Message::* Perl Modules) as far as possible,
14			## to be able to use this module (M::M::Charset) from
15			## other (non-Message::*) modules.
16
17	wakaba	1.1	package Message::MIME::Charset;
18			use strict;
19	wakaba	1.12	use vars qw(%CHARSET %MSNAME2IANANAME %REG $VERSION);
20	wakaba	1.16	$VERSION=do{my @r=(q$Revision: 1.15 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
21	wakaba	1.1
22	wakaba	1.9	&_builtin_charset;
23			sub _builtin_charset () {
24	wakaba	1.4
25			$CHARSET{'*DEFAULT'} = {
26			preferred_name => '',
27
28			encoder => sub { $_[1] },
29			decoder => sub { $_[1] },
30
31			mime_text => 1, ## Suitability in use as MIME text/* charset
32			#accept_cte => [qw/7bit .../],
33			cte_7bit_preferred => 'quoted-printable',
34			};
35			$CHARSET{'default'} = $CHARSET{'DEFAULT'};
36
37			$CHARSET{'us-ascii'} = {
38			preferred_name => 'us-ascii',
39
40			encoder => sub { $_[1] },
41			decoder => sub { $_[1] },
42	wakaba	1.5
43			mime_text => 1,
44	wakaba	1.13	cte_7bit_preferred => 'quoted-printable',
45	wakaba	1.4	};
46
47			$CHARSET{'iso-2022-int-1'} = {
48			preferred_name => 'iso-2022-int-1',
49
50			encoder => sub { $_[1] },
51			decoder => sub { $_[1] },
52	wakaba	1.5
53			mime_text => 1,
54	wakaba	1.4	};
55
56			$CHARSET{'unknown-8bit'} = {
57			preferred_name => 'unknown-8bit',
58
59			encoder => sub { $_[1] },
60			decoder => sub { $_[1] },
61
62	wakaba	1.13	mime_text => 1,
63			cte_7bit_preferred => 'base64',
64			};
65
66			$CHARSET{'x-unknown'} = {
67			preferred_name => 'x-unknown',
68
69			encoder => sub { $_[1] },
70			decoder => sub { $_[1] },
71
72			mime_text => 0,
73			cte_7bit_preferred => 'base64',
74			};
75
76			$CHARSET{'*undef'} = {
77			preferred_name => '',
78
79			#encoder => sub { $_[1] },
80			#decoder => sub { $_[1] },
81
82	wakaba	1.4	mime_text => 0,
83	wakaba	1.6	cte_7bit_preferred => 'base64',
84	wakaba	1.4	};
85
86	wakaba	1.9	} # /builtin_charset
87
88			my %_MINIMUMIZER = (
89			'euc-jp' => \&_name_euc_japan,
90			'euc-jisx0213' => \&_name_euc_japan,
91			'euc-jisx0213-plane1' => \&_name_euc_japan,
92			'x-euc-jisx0213-packed' => \&_name_euc_japan,
93	wakaba	1.11	'x-iso-2022' => \&_name_8bit_iso2022,
94			'iso-2022-cn' => \&_name_8bit_iso2022,
95			'iso-2022-cn-ext' => \&_name_8bit_iso2022,
96	wakaba	1.9	'iso-2022-int-1' => \&_name_net_ascii_8bit,
97	wakaba	1.11	'iso-2022-jp' => \&_name_8bit_iso2022,
98			'iso-2022-jp-1' => \&_name_8bit_iso2022,
99			'iso-2022-jp-2' => \&_name_8bit_iso2022,
100			'iso-2022-jp-3' => \&_name_8bit_iso2022,
101			'iso-2022-jp-3-plane1' => \&_name_8bit_iso2022,
102			'iso-2022-kr' => \&_name_8bit_iso2022,
103			'iso-8859-1' => \&_name_8bit_iso2022,
104	wakaba	1.9	'iso-10646-j-1' => \&_name_utf16be,
105			'iso-10646-ucs-2' => \&_name_utf16be,
106			'iso-10646-ucs-4' => \&_name_utf32be,
107			'iso-10646-ucs-basic' => \&_name_utf16be,
108			'iso-10646-unicode-latin1' => \&_name_utf16be,
109			jis_x0201 => \&_name_shift_jis,
110	wakaba	1.11	junet => \&_name_8bit_iso2022,
111	wakaba	1.9	'x-junet8' => \&_name_net_ascii_8bit,
112			shift_jis => \&_name_shift_jis,
113			shift_jisx0213 => \&_name_shift_jis,
114			'shift_jisx0213-plane1' => \&_name_shift_jis,
115			'x-sjis' => \&_name_shift_jis,
116			'us-ascii' => \&_name_net_ascii_8bit,
117			'utf-8' => \&_name_net_ascii_8bit,
118			'utf-16be' => \&_name_utf16be,
119			'utf-32be' => \&_name_utf32be,
120			);
121
122	wakaba	1.14	my %_IsMimeText;
123			for (qw(
124			adobe-standard-encoding adobe-symbol-encoding
125			big5 big5-eten big5-hkscs
126			cp950
127			gbk gb18030
128			euc-jp euc-jisx0213 euc-kr euc-tw
129			hp-roman8
130			hz-gb-2312
131			ibm437
132	wakaba	1.16	junet x-junet8 x-iso-2022
133	wakaba	1.14	iso-2022-cn iso-2022-cn-ext
134			iso-2022-int-1
135			iso-2022-jp iso-2022-jp-1 iso-2022-jp-2 iso-2022-jp-3
136	wakaba	1.15	x-iso2022jp-cp932
137	wakaba	1.14	iso-2022-kr
138			iso-8859-1 iso-8859-2 iso-8859-3
139			iso-8859-4 iso-8859-5 iso-8859-6
140			iso-8859-7 iso-8859-8 iso-8859-9
141			iso-8859-10 iso-8859-12 iso-8859-13
142			iso-8859-14 iso-8859-15 iso-8859-16
143			jis_encoding
144			koi8-r koi8-u
145			x-mac-arabic x-mac-centralroman x-mac-cyrillic x-mac-greek
146			x-mac-hebrew x-mac-icelandic macintosh x-mac-turkish
147			x-mac-ukrainian x-mac-chinesesimp x-mac-japanese x-mac-korean
148			shift_jis shift_jisx0213 x-sjis
149			tis-620
150			unicode-1-1-utf-7 unicode-1-1-utf-8
151			unicode-2-0-utf-7 unicode-2-0-utf-8
152			utf-7 utf-8 utf-9
153			viscii
154			windows-1250 windows-1251 windows-1252 windows-1253
155			windows-1254 windows-1255 windows-1256 windows-1257
156			windows-1258 windows-31j windows-949
157			)) { $_IsMimeText{$_} = 1 }
158
159	wakaba	1.12	%MSNAME2IANANAME = (
160			'iso-2022-jp' => 'x-iso2022jp-cp932',
161			'ks_c_5601-1987' => 'windows-949',
162			);
163
164	wakaba	1.4	sub make_charset ($%) {
165			my $name = shift;
166			return unless $name; ## Note: charset "0" is not supported.
167			my %definition = @_;
168	wakaba	1.6
169			$definition{preferred_name} \|\|= $name;
170	wakaba	1.4	if ($definition{preferred_name} ne $name
171			&& ref $CHARSET{$definition{preferred_name}}) {
172			## New charset is an alias of defined charset,
173			$CHARSET{$name} = $CHARSET{$definition{preferred_name}};
174			return;
175			} elsif ($definition{alias_of} && ref $CHARSET{$definition{alias_of}}) {
176			## New charset is an alias of defined charset,
177			$CHARSET{$name} = $CHARSET{$definition{alias_of}};
178			return;
179			}
180			$CHARSET{$name} = \%definition;
181
182			## Set default values
183	wakaba	1.6	#$definition{encoder} \|\|= sub { $_[1] };
184			#$definition{decoder} \|\|= sub { $_[1] };
185	wakaba	1.4
186			$definition{mime_text} = 0 unless defined $definition{mime_text};
187			$definition{cte_7bit_preferred} = 'base64'
188			unless defined $definition{cte_7bit_preferred};
189			}
190	wakaba	1.1
191			sub encode ($$) {
192			my ($charset, $s) = (lc shift, shift);
193	wakaba	1.13	my $c = ref $CHARSET{$charset}->{encoder}? $charset: '*undef';
194			if (ref $CHARSET{$c}->{encoder}) {
195			my ($t, %r) = &{$CHARSET{$c}->{encoder}} ($charset, $s);
196			unless (defined $r{success}) {
197			$r{success} = 1;
198			}
199			return ($t, %r);
200	wakaba	1.1	}
201	wakaba	1.5	($s, success => 0);
202	wakaba	1.1	}
203
204			sub decode ($$) {
205			my ($charset, $s) = (lc shift, shift);
206	wakaba	1.13	my $c = ref $CHARSET{$charset}->{decoder}? $charset: '*undef';
207			if (ref $CHARSET{$c}->{decoder}) {
208			my ($t, %r) = &{$CHARSET{$c}->{decoder}} ($charset, $s);
209			unless (defined $r{success}) {
210			$r{success} = 1;
211			}
212			return ($t, %r);
213	wakaba	1.1	}
214	wakaba	1.13	($s, success => 0);
215	wakaba	1.1	}
216
217			sub name_normalize ($) {
218			my $name = lc shift;
219	wakaba	1.14	if (ref $CHARSET{$name}->{preferred_name} eq 'CODE') {
220			return &{ $CHARSET{$name}->{preferred_name} } ($name);
221			} elsif ($CHARSET{$name}->{preferred_name}) {
222			return $CHARSET{$name}->{preferred_name};
223			} elsif (ref $CHARSET{'*undef'}->{preferred_name} eq 'CODE') {
224			return &{ $CHARSET{'*undef'}->{preferred_name} } ($name);
225			}
226			$name;
227	wakaba	1.1	}
228
229	wakaba	1.6	sub name_minimumize ($$) {
230			my ($charset, $s) = (lc shift, shift);
231	wakaba	1.9	if (ref $CHARSET{$charset}->{name_minimumizer} eq 'CODE') {
232	wakaba	1.6	return &{$CHARSET{$charset}->{name_minimumizer}} ($charset, $s);
233	wakaba	1.9	} elsif (ref $_MINIMUMIZER{$charset}) {
234			return &{$_MINIMUMIZER{$charset}} ($charset, $s);
235	wakaba	1.13	} elsif (ref $CHARSET{'*undef'}->{name_minimumizer} eq 'CODE') {
236			return &{$CHARSET{'*undef'}->{name_minimumizer}} ($charset, $s);
237	wakaba	1.9	}
238			(charset => $charset);
239			}
240
241	wakaba	1.12	sub msname2iananame ($) {
242			my $mscharset = shift;
243			$MSNAME2IANANAME{$mscharset} \|\| $mscharset;
244			}
245
246	wakaba	1.9	sub _name_7bit_iso2022 ($$) {shift;
247			my $s = shift;
248			if ($s =~ /[\x0E\x0F\x1B]/) {
249			return (charset => 'iso-2022-jp')
250			unless $s =~ /\x1B[^\x24\x28]
251			\|\x1B\x24[^\x40B]
252			\|\x1B\x28[^BJ]
253			\|\x0E\|\x0F/x;
254			return (charset => 'iso-2022-jp-1')
255			unless $s =~ /\x1B[^\x24\x28]
256			\|\x1B\x24[^\x40B\x28]
257			\|\x1B\x24\x28[^D]
258			\|\x1B\x28[^BJ]
259			\|\x0E\|\x0F/x;
260			return (charset => 'iso-2022-jp-3-plane1')
261			unless $s =~ /\x1B[^\x24\x28]
262			\|\x1B\x24[^\x28] #[^B\x28]
263			\|\x1B\x24\x28[^O]
264			\|\x1B\x28[^B]
265			\|\x0E\|\x0F/x;
266			return (charset => 'iso-2022-jp-3')
267			unless $s =~ /\x1B[^\x24\x28]
268			\|\x1B\x24[^\x28] #[^B\x28]
269			\|\x1B\x24\x28[^OP]
270			\|\x1B\x28[^B]
271			\|\x0E\|\x0F/x;
272			return (charset => 'iso-2022-kr')
273			unless $s =~ /\x1B[^\x24]
274			\|\x1B\x24[^\x29]
275			\|\x1B\x24\x29[^C]/x;
276			return (charset => 'iso-2022-jp-2')
277			unless $s =~ /\x1B[^\x24\x28\x2E\x4E]
278			\|\x1B\x24[^\x40AB\x28]
279			\|\x1B\x24\x28[^CD]
280			\|\x1B\x28[^BJ]
281			\|\x1B\x2E[^AF]
282			\|\x0E\|\x0F/x;
283			return (charset => 'iso-2022-cn')
284			unless $s =~ /\x1B[^\x4E\x24]
285			\|\x1B\x24[^\x29\x2A]
286			\|\x1B\x24\x29[^AG]
287			\|\x1B\x24\x2A[^H]/x;
288			return (charset => 'iso-2022-cn-ext')
289			unless $s =~ /\x1B[^\x4E\x4F\x24]
290			\|\x1B\x24[^\x29\x2A]
291			\|\x1B\x24\x29[^AEG]
292			\|\x1B\x24\x2A[^HIJKLM]/x;
293			return (charset => 'iso-2022-int-1')
294			unless $s =~ /\x1B[^\x24\x28\x2D]
295			\|\x1B\x24[^\x40AB\x28\x29]
296			\|\x1B\x24\x28[^DGH]
297			\|\x1B\x24\x29[^C]
298			\|\x1B\x28[^BJ]
299			\|\x1B\x2D[^AF]/x;
300			return (charset => 'junet')
301			unless $s =~ /\x1B[^\x24\x28\x2C]
302			\|\x1B\x24[^\x28\x2C\x40-\x42]
303			\|\x1B\x24[\x28\x2C][^\x20-\x7E]
304			\|\x1B\x24[\x28\x2C][\x20-\x2F]+[^\x30-\x7E]
305			\|\x1B[\x28\x2C][^\x20-\x7E]
306			\|\x1B[\x28\x2C][\x20-\x2F]+[^\x30-\x7E]
307			\|\x0E\|\x0F/x;
308			return (charset => 'x-iso-2022');
309			} else {
310			return (charset => 'us-ascii');
311	wakaba	1.6	}
312			}
313
314	wakaba	1.9	sub _name_net_ascii_8bit ($) {
315			my $name = shift; my $s = shift;
316	wakaba	1.8	return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F\x80-\xFF]/;
317			if ($s =~ /[\x80-\xFF]/) {
318			if ($s =~ /[\xC0-\xFD][\x80-\xBF]*[\x80-\x8F]/) {
319			if ($s =~ /\x1B/) {
320	wakaba	1.9	return (charset => 'x-junet8'); ## junet + UTF-8
321	wakaba	1.8	} else {
322			return (charset => 'utf-8');
323			}
324			} elsif ($s =~ /\x1B/) {
325	wakaba	1.9	return (charset => 'x-iso-2022'); ## 8bit ISO 2022
326			} else {
327			return (charset => 'iso-8859-1');
328			}
329			} else { ## 7bit ISO 2022
330			return _name_7bit_iso2022 ($name, $s);
331			}
332			}
333
334	wakaba	1.11	sub _name_8bit_iso2022 ($$) {
335	wakaba	1.9	my $name = shift; my $s = shift;
336			return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F\x80-\xFF]/;
337			if ($s =~ /[\x80-\xFF]/) {
338			if ($s =~ /\x1B/) {
339			return (charset => 'x-iso-2022'); ## 8bit ISO 2022
340	wakaba	1.8	} else {
341			return (charset => 'iso-8859-1');
342			}
343	wakaba	1.9	} else { ## 7bit ISO 2022
344			return _name_7bit_iso2022 ($name, $s);
345			}
346			}
347
348			## Not completed.
349			## TODO: gb18030, cn-gb-12345
350			## TODO: _name_euc_gbf (cn-gb-12345, gb2312)
351			sub _name_euc_gb ($$) {
352			my $name = shift; my $s = shift;
353			if ($s =~ /[\x80-\xFF]/) {
354			if ($s =~ /
355			(?:\G\|[\x00-\x3F\x7F\x80\xFF])
356			(?:[\xA1-\xA9\xB0-\xFE][\xA1-\xFE]
357			\|[\x40-\x7E])*
358			(?:
359			[\x81-\xA0\xAA-\xAF][\x40-\xFE]
360			\|[\xA1-\xFE][\x40-\xA0]
361			)
362			/x) {
363			(charset => 'gbk');
364			} elsif ($s =~ /
365			(?:\xA2[\xA1-\xAA]
366			\|\xA6[\xE0-\xF5]
367			\|\xA8[\xBB-\xC0]
368			)
369			(?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]\|\z))
370			/x) {
371			(charset => 'gbk');
372			} elsif ($s =~ /
373			(?:\xA3\xE7\|\xA7[\xDD-\xF2]
374			\|\xA8[\xBB-\xC0]
375			\|[\xAA-\xAF\xF8-\xFE][\xA1-\xFE]
376			)
377			(?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]\|\z))
378			/x) {
379			(charset => 'cn-gb-isoir165', 'charset-edition' => 1992);
380			} elsif ($s =~ /\xEF\xF1 ## Typo bug of GB 2312
381			(?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]\|\z))
382			/x) {
383			(charset => 'gb2312');
384			} else {
385			(charset => 'gb2312', 'charset-edition' => 1980);
386			}
387			} elsif ($s =~ /[\x0E\x0F]/) {
388			(charset => 'gb2312'); ## Actually, this is not "gb2312"
389			} else {
390	wakaba	1.11	_name_7bit_iso2022 ($name, $s);
391	wakaba	1.9	}
392			}
393
394			sub _name_euc_japan ($$) {
395			my $name = shift; my $s = shift;
396			if ($s =~ /[\x80-\xFF]/) {
397			if ($s =~ /\x8F[\xA1\xA3-\xA5\xA8\xAC-\xAF\xEE-\xFE][\xA1-\xFE]/) {
398			if ($s =~ /\x8F[\xA2\xA6\xA7\xA9-\xAB\xB0-\xED][\xA1-\xFE]/) {
399			## JIS X 0213 plane 2 + JIS X 0212
400			(charset => 'x-euc-jisx0213-packed');
401			} else {
402			(charset => 'euc-jisx0213');
403			}
404			} elsif ($s =~ m{(?<![\x8E\x8F]) ## Not G2/G3 character
405			(?: ## JIS X 0213:2000
406			[\xA9-\xAF\xF5-\xFE][\xA1-\xFE]
407			\|\xA2[\xAF-\xB9\xC2-\xC9\xD1-\xDB\xE9-\xF1\xFA-\xFD]
408			\|\xA3[\xA1-\xAF\xBA-\xC0\xDB-\xE0\xFB-\xFE]
409			\|\xA4[\xF4-\xFE]\|\xA5[\xF7-\xFE]
410			\|\xA6[\xB9-\xC0\xD9-\xFE]\|\xA7[\xC2-\xD0\xF2-\xFE]
411			\|\xA8[\xC1-\xFE]\|\xCF[\xD4-\xFE]\|\xF4[\xA7-\xFE]
412			)
413			(?=(?:[\xA1-\xFE][\xA1-\xFE])*(?:[\x00-\xA0\xFF]\|\z))}x) {
414			if ($s =~ /\x8F/) { ## JIS X 0213 plane 1 + JIS X 0212
415			(charset => 'x-euc-jisx0213-packed');
416			} else {
417			(charset => 'euc-jisx0213-plane1');
418			}
419			} else {
420			(charset => 'euc-jp');
421			}
422			} elsif ($s =~ /\x0E\|\x0F\|\x1B[\x4E\x4F]/) {
423			(charset => 'euc-jisx0213'); ## Actually, this is not euc-japan
424			} else {
425	wakaba	1.11	_name_7bit_iso2022 ($name, $s);
426	wakaba	1.9	}
427			}
428
429			sub _name_shift_jis ($$) {
430			my $name = shift; my $s = shift;
431			if ($s =~ /[\x80-\xFF]/) {
432			if ($s =~ /[\x0E\x0F\x1B]/) {
433			(charset => 'x-sjis');
434			} elsif ($s =~ /
435			(?:\G\|[\x00-\x3F\x7F])
436			(?:[\x81-\x9F\xE0-\xFC][\x40-\x7E\x80-\xFC]
437			\|[\x40-\x7E\xA1-\xDF])*
438			[\xF0-\xFC][\x40-\x7E\x80-\xFC]
439			/x) {
440			(charset => 'shift_jisx0213');
441			} elsif ($s =~ /
442			(?:\G\|[\x00-\x3F\x7F])
443			(?:[\x81-\x9F\xE0-\xFC][\x40-\x7E\x80-\xFC]
444			\|[\x40-\x7E\xA1-\xDF])*
445			(?:
446			[\x85-\x87\xEB-\xEF][\x40-\x7E\x80-\xFC]
447			\|\x81[\xAD-\xB7\xC0-\xC7\xCF-\xD9\xE9-\xEF\xF8-\xFB]
448			\|\x82[\x40-\x4E\x59-\x5F\x7A-\x80\x9B-\x9E\xF2-\xFC]
449			\|\x83[\x97-\x9E\xB7-\xBE\xD7-\xFC]
450			\|\x84[\x61-\x6F\x72-\x9E\xBF-\xFC]
451			\|\x88[\x40-\x9E]\|\x98[\x73-\x9E]\|\xEA[\xA5-\xFC]
452			)
453			/x) {
454			(charset => 'shift_jisx0213-plane1');
455			} else {
456			(charset => 'shift_jis');
457			}
458			} elsif ($s =~ /[\x5C\x7E]/) {
459			if ($s =~ /\x1B\x0E\x0F/) {
460			(charset => 'x-sjis'); ## ISO 2022 with implied "ESC ( J"
461			## BUG: "ESC ( B foobar\aaa ESC ( J aiueo" also matchs this
462			} else {
463			(charset => 'jis_x0201');
464			}
465			} else {
466	wakaba	1.11	_name_7bit_iso2022 ($name, $s);
467	wakaba	1.9	}
468			}
469
470			sub _name_utf16be ($$) {
471			shift; my $s = shift;
472			if ($s =~ /[\xD8-\xDB][\x00-\xFF][\xDC-\xDF][\x00-\xFF]
473			(?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
474			(charset => 'utf-16be');
475			} elsif ($s =~ /[\x01-\xFF][\x00-\xFF]
476			(?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
477			if ($s =~ /([^\x00\x03\x04\x23\x25\x30\xFE\xFF]
478			[\x00-\xFF] # ^\x20\x22\x4E-\x9F\xF9\xFA
479			\|\x03[^\x00-\x6F\xD0-\xFF]
480			#\|\x20[^\x00-\x6F]
481			\|\x25[^\x00-\x7F]
482			\|\xFE[^\x30-\x4F]
483			\|\xFF[^\x00-\xEF]
484			## note 1 of RFC 1816 is ambitious, so block entire
485			## is excepted
486			\|\x30[\x00-\x3F]
487			)
488			(?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
489			(charset => 'iso-10646-ucs-2');
490			} else {
491			(charset => 'iso-10646-j-1');
492			}
493			} elsif ($s =~ /\x00[\x80-\xFF]
494			(?=(?:[\x00-\xFF][\x00-\xFF])*\z)/sx) {
495			(charset => 'iso-10646-unicode-latin1');
496			} else {
497			(charset => 'iso-10646-ucs-basic');
498			}
499			}
500
501			sub _name_utf32be ($$) {
502			shift; my $s = shift;
503			if ($s =~ /
504			([\x01-\x7F][\x00-\xFF]{3}
505			\|\x00[\x11-\xFF][\x00-\xFF][\x00-\xFF])
506			(?=(?:[\x00-\xFF]{4})*\z)/sx) {
507			(charset => 'iso-10646-ucs-4');
508			} else {
509			(charset => 'utf-32be');
510	wakaba	1.8	}
511			}
512
513	wakaba	1.13	sub _utf8_on ($) {
514			Encode::_utf8_on ($_[0]) if $Encode::VERSION;
515			}
516			sub _utf8_off ($) {
517			Encode::_utf8_off ($_[0]) if $Encode::VERSION;
518			}
519
520	wakaba	1.14	sub is_mime_text ($) {
521			my $name = lc shift;
522			if (ref $CHARSET{$name}->{mime_text} eq 'CODE') {
523			return &{ $CHARSET{$name}->{mime_text} } ($name);
524			} elsif (defined $CHARSET{$name}->{mime_text}) {
525			return $CHARSET{$name}->{mime_text};
526			} elsif (defined $_IsMimeText{$name}) {
527			return $_IsMimeText{$name};
528			} elsif (ref $CHARSET{'*undef'}->{mime_text} eq 'CODE') {
529			return &{ $CHARSET{'*undef'}->{mime_text} } ($name);
530			}
531			0;
532			}
533
534	wakaba	1.1	=head1 LICENSE
535
536			Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
537
538			This program is free software; you can redistribute it and/or modify
539			it under the terms of the GNU General Public License as published by
540			the Free Software Foundation; either version 2 of the License, or
541			(at your option) any later version.
542
543			This program is distributed in the hope that it will be useful,
544			but WITHOUT ANY WARRANTY; without even the implied warranty of
545			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
546			GNU General Public License for more details.
547
548			You should have received a copy of the GNU General Public License
549			along with this program; see the file COPYING. If not, write to
550			the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
551			Boston, MA 02111-1307, USA.
552
553			=head1 CHANGE
554
555			See F<ChangeLog>.
556	wakaba	1.16	$Date: 2002/07/26 12:42:00 $
557	wakaba	1.1
558			=cut
559
560			1;