Message/MIME/Charset.pm


=head1 NAME

Message::MIME::Charset Perl module

=head1 DESCRIPTION

Perl module for MIME charset.

=cut

package Message::MIME::Charset;
use strict;
use vars qw(%ENCODER %DECODER %N11NTABLE %REG $VERSION);
$VERSION=do{my @r=(q$Revision: 1.6 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};

our %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] },
        name_minimumizer        => sub {
          shift; my $s = shift;
          return (charset => 'unknown-8bit') if $s =~ /[\x80-\xFF]/;
          (charset => 'us-ascii');
        },
        
        mime_text       => 1,
};

$CHARSET{'iso-2022-int-1'} = {
        preferred_name  => 'iso-2022-int-1',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        name_minimumizer        => sub {
          shift; my $s = shift;
          return (charset => 'unknown-8bit') if $s =~ /[\x80-\xFF]/;
          return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F]/;
          return (charset => 'iso-2022-jp') unless $s =~ /\x1B[^\x24\x28]|\x1B\x24[^\x40B]|\x1B\x28[^BJ]|\x0E|\x0F/;
          return (charset => 'iso-2022-jp-1') unless $s =~ /\x1B[^\x24\x28]|\x1B\x24[^\x40B\x28]|\x1B\x28[^BJ]|\x1B\x24\x28[^D]|\x0E|\x0F/;
          return (charset => 'iso-2022-jp-3-plane1') unless $s =~ /\x1B[^\x24\x28]|\x1B\x24[^B\x28]|\x1B\x28[^B]|\x1B\x24\x28[^O]|\x0E|\x0F/;
          return (charset => 'iso-2022-jp-3') unless $s =~ /\x1B[^\x24\x28]|\x1B\x24[^B\x28]|\x1B\x28[^B]|\x1B\x24\x28[^OP]|\x0E|\x0F/;
          return (charset => 'iso-2022-kr') unless $s =~ /\x1B[^\x24]|\x1B\x24[^\x29]|\x1B\x24\x29C/;
          return (charset => 'iso-2022-cn') unless $s =~ /\x1B[^\x24\x28]|\x1B\x24[^B]|\x1B\x28[^A]|\x1B\x24\x28[^GH]|\x0E|\x0F/;
          (charset => 'iso-2022-int-1');
        },
        
        mime_text       => 1,
};

$CHARSET{'unknown-8bit'} = {
        preferred_name  => 'unknown-8bit',
        
        encoder => sub { $_[1] },
        decoder => sub { $_[1] },
        
        mime_text       => 0,
        cte_7bit_preferred      => 'base64',
};
$CHARSET{'x-unknown'} = $CHARSET{'unknown-8bit'};

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);
  if (ref $CHARSET{$charset}->{encoder}) {
    return (&{$CHARSET{$charset}->{encoder}} ($charset, $s), success => 1);
  }
  ($s, success => 0);
}

sub decode ($$) {
  my ($charset, $s) = (lc shift, shift);
  if (ref $CHARSET{$charset}->{decoder}) {
    return (&{$CHARSET{$charset}->{decoder}} ($charset, $s), 1);
  }
  ($s, 0);
}

sub name_normalize ($) {
  my $name = lc shift;
  $CHARSET{$name}->{preferred_name} || $name;
}

sub name_minimumize ($$) {
  my ($charset, $s) = (lc shift, shift);
  if (ref $CHARSET{$charset}->{name_minimumizer}) {
    return &{$CHARSET{$charset}->{name_minimumizer}} ($charset, $s);
  }
  $charset;
}

=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: 2002/06/09 11:13:14 $

=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			package Message::MIME::Charset;
13			use strict;
14			use vars qw(%ENCODER %DECODER %N11NTABLE %REG $VERSION);
15	wakaba	1.7	$VERSION=do{my @r=(q$Revision: 1.6 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
16	wakaba	1.1
17	wakaba	1.4	our %CHARSET;
18
19			$CHARSET{'*DEFAULT'} = {
20			preferred_name => '',
21
22			encoder => sub { $_[1] },
23			decoder => sub { $_[1] },
24
25			mime_text => 1, ## Suitability in use as MIME text/* charset
26			#accept_cte => [qw/7bit .../],
27			cte_7bit_preferred => 'quoted-printable',
28			};
29			$CHARSET{'default'} = $CHARSET{'DEFAULT'};
30
31			$CHARSET{'us-ascii'} = {
32			preferred_name => 'us-ascii',
33
34			encoder => sub { $_[1] },
35			decoder => sub { $_[1] },
36	wakaba	1.7	name_minimumizer => sub {
37			shift; my $s = shift;
38			return (charset => 'unknown-8bit') if $s =~ /[\x80-\xFF]/;
39			(charset => 'us-ascii');
40			},
41	wakaba	1.5
42			mime_text => 1,
43	wakaba	1.4	};
44
45			$CHARSET{'iso-2022-int-1'} = {
46			preferred_name => 'iso-2022-int-1',
47
48			encoder => sub { $_[1] },
49			decoder => sub { $_[1] },
50	wakaba	1.6	name_minimumizer => sub {
51			shift; my $s = shift;
52	wakaba	1.7	return (charset => 'unknown-8bit') if $s =~ /[\x80-\xFF]/;
53	wakaba	1.6	return (charset => 'us-ascii') unless $s =~ /[\x1B\x0E\x0F]/;
54			return (charset => 'iso-2022-jp') unless $s =~ /\x1B[^\x24\x28]\|\x1B\x24[^\x40B]\|\x1B\x28[^BJ]\|\x0E\|\x0F/;
55			return (charset => 'iso-2022-jp-1') unless $s =~ /\x1B[^\x24\x28]\|\x1B\x24[^\x40B\x28]\|\x1B\x28[^BJ]\|\x1B\x24\x28[^D]\|\x0E\|\x0F/;
56			return (charset => 'iso-2022-jp-3-plane1') unless $s =~ /\x1B[^\x24\x28]\|\x1B\x24[^B\x28]\|\x1B\x28[^B]\|\x1B\x24\x28[^O]\|\x0E\|\x0F/;
57			return (charset => 'iso-2022-jp-3') unless $s =~ /\x1B[^\x24\x28]\|\x1B\x24[^B\x28]\|\x1B\x28[^B]\|\x1B\x24\x28[^OP]\|\x0E\|\x0F/;
58			return (charset => 'iso-2022-kr') unless $s =~ /\x1B[^\x24]\|\x1B\x24[^\x29]\|\x1B\x24\x29C/;
59			return (charset => 'iso-2022-cn') unless $s =~ /\x1B[^\x24\x28]\|\x1B\x24[^B]\|\x1B\x28[^A]\|\x1B\x24\x28[^GH]\|\x0E\|\x0F/;
60			(charset => 'iso-2022-int-1');
61			},
62	wakaba	1.5
63			mime_text => 1,
64	wakaba	1.4	};
65
66			$CHARSET{'unknown-8bit'} = {
67			preferred_name => 'unknown-8bit',
68
69			encoder => sub { $_[1] },
70			decoder => sub { $_[1] },
71
72			mime_text => 0,
73	wakaba	1.6	cte_7bit_preferred => 'base64',
74	wakaba	1.4	};
75			$CHARSET{'x-unknown'} = $CHARSET{'unknown-8bit'};
76
77			sub make_charset ($%) {
78			my $name = shift;
79			return unless $name; ## Note: charset "0" is not supported.
80			my %definition = @_;
81	wakaba	1.6
82			$definition{preferred_name} \|\|= $name;
83	wakaba	1.4	if ($definition{preferred_name} ne $name
84			&& ref $CHARSET{$definition{preferred_name}}) {
85			## New charset is an alias of defined charset,
86			$CHARSET{$name} = $CHARSET{$definition{preferred_name}};
87			return;
88			} elsif ($definition{alias_of} && ref $CHARSET{$definition{alias_of}}) {
89			## New charset is an alias of defined charset,
90			$CHARSET{$name} = $CHARSET{$definition{alias_of}};
91			return;
92			}
93			$CHARSET{$name} = \%definition;
94
95			## Set default values
96	wakaba	1.6	#$definition{encoder} \|\|= sub { $_[1] };
97			#$definition{decoder} \|\|= sub { $_[1] };
98	wakaba	1.4
99			$definition{mime_text} = 0 unless defined $definition{mime_text};
100			$definition{cte_7bit_preferred} = 'base64'
101			unless defined $definition{cte_7bit_preferred};
102			}
103	wakaba	1.1
104			sub encode ($$) {
105			my ($charset, $s) = (lc shift, shift);
106	wakaba	1.4	if (ref $CHARSET{$charset}->{encoder}) {
107	wakaba	1.5	return (&{$CHARSET{$charset}->{encoder}} ($charset, $s), success => 1);
108	wakaba	1.1	}
109	wakaba	1.5	($s, success => 0);
110	wakaba	1.1	}
111
112			sub decode ($$) {
113			my ($charset, $s) = (lc shift, shift);
114	wakaba	1.4	if (ref $CHARSET{$charset}->{decoder}) {
115			return (&{$CHARSET{$charset}->{decoder}} ($charset, $s), 1);
116	wakaba	1.1	}
117	wakaba	1.2	($s, 0);
118	wakaba	1.1	}
119
120			sub name_normalize ($) {
121			my $name = lc shift;
122	wakaba	1.4	$CHARSET{$name}->{preferred_name} \|\| $name;
123	wakaba	1.1	}
124
125	wakaba	1.6	sub name_minimumize ($$) {
126			my ($charset, $s) = (lc shift, shift);
127			if (ref $CHARSET{$charset}->{name_minimumizer}) {
128			return &{$CHARSET{$charset}->{name_minimumizer}} ($charset, $s);
129			}
130			$charset;
131			}
132
133	wakaba	1.1	=head1 LICENSE
134
135			Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
136
137			This program is free software; you can redistribute it and/or modify
138			it under the terms of the GNU General Public License as published by
139			the Free Software Foundation; either version 2 of the License, or
140			(at your option) any later version.
141
142			This program is distributed in the hope that it will be useful,
143			but WITHOUT ANY WARRANTY; without even the implied warranty of
144			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
145			GNU General Public License for more details.
146
147			You should have received a copy of the GNU General Public License
148			along with this program; see the file COPYING. If not, write to
149			the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
150			Boston, MA 02111-1307, USA.
151
152			=head1 CHANGE
153
154			See F<ChangeLog>.
155	wakaba	1.7	$Date: 2002/06/09 11:13:14 $
156	wakaba	1.1
157			=cut
158
159			1;