Message/MIME/Encoding.pm


=head1 NAME

Message::MIME::Encoding --- Encoding (MIME CTE, HTTP encodings, etc) definitions

=cut

package Message::MIME::Encoding;
use strict;
use vars qw($VERSION);
$VERSION=do{my @r=(q$Revision: 1.1 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};

our %ENCODER = (
        '7bit'  => sub { ($_[1], decide_coderange (@_[0,1])) },
        '8bit'  => sub { ($_[1], decide_coderange (@_[0,1])) },
        binary  => sub { ($_[1], decide_coderange (@_[0,1])) },
        base64  => sub { require MIME::Base64; 
                         (MIME::Base64::encode ($_[1]), 'base64') },
        'quoted-printable'      => \&encode_qp,
        #       => sub { require MIME::QuotedPrint; 
        #                (MIME::QuotedPrint::encode ($_[1]), 'quoted-printable') },
        'x-gzip64' => sub {
                if (eval {require Compress::Zlib}) {
                  require MIME::Base64;
                  my $s = Compress::Zlib::memGzip ($_[1]);
                  (MIME::Base64::encode ($s), 'x-gzip64');
                } else {
                  Carp::carp "gzip64 encode: $@";
                  ($_[1], 'binary');
                }
        },
        'x-uu'  => \&uuencode,
        'x-uue' => \&uuencode,
        'x-uuencode'    => \&uuencode,
        'x-uuencoded'   => \&uuencode,
);
our %DECODER = (
        '7bit'  => sub { ($_[1], 'binary') },
        '8bit'  => sub { ($_[1], 'binary') },
        binary  => sub { ($_[1], 'binary') },
        base64  => sub { require MIME::Base64; 
                         (MIME::Base64::decode ($_[1]), 'binary') },
        'quoted-printable'      => \&decode_qp,
        #       => sub { require MIME::QuotedPrint; 
        #                (MIME::QuotedPrint::decode ($_[1]), 'binary') },
        'x-gzip64'      => sub {
                require MIME::Base64;
                my $s = MIME::Base64::decode ($_[1]);
                my ($t, $e) = uncompress_gzip ($_[0], $s);
                if ($e eq 'identity') { return ($t, 'binary') }
                else { return ($_[1], 'x-gzip64') }
        },
        'x-uu'  => \&uudecode,
        'x-uue' => \&uudecode,
        'x-uuencode'    => \&uudecode,
        'x-uuencoded'   => \&uudecode,
);

sub decide_coderange ($$) {
  my $yourself = shift;
  my $s = shift;        ## TODO: check media type and charset
  return 'binary' if $s =~ /\x00/;
  return 'binary' if $s =~ /\x0D(?!\x0A)/s;
  #return 'binary' if $s =~ /(?<!\x0D)\x0A/s;   ## BUG: does not work?
  return '8bit'   if $s =~ /[\x80-\xFF]/;
  '7bit';
}

## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
##           by Gisle Aas
sub encode_qp ($$) {
  my $yourself = shift;
  my $s = shift;
  my $nl = "\x0D\x0A";
  my $mt_is_text = 0;
  my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
  $mt_is_text = 1 if $mt eq 'text' || $mt eq 'multipart' || $mt eq 'message';
  ## RFC 2045 [^\x09\x20\x21-\x3C\x3E-\x7E]
  ## - RFC 2049 "mail-safe"     [^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A]
  $s =~ s/([^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A])/sprintf('=%02X', ord($1))/eg;  # rule #2,#3
  if ($mt_is_text) {
    $s =~ s/([\x09\x20]+)(?==0D=0A|$)/
      join('', map { sprintf('=%02X', ord($_)) }
        split('', $1)
    )/egm;                        # rule #3 (encode whitespace at eol)
    $s =~ s/=0D=0A/\x0D\x0A/g;
  } else {
    $s =~ s/([\x09\x20]+)$/
      join('', map { sprintf('=%02X', ord($_)) }
        split('', $1)
    )/egm;                        # rule #3 (encode whitespace at eol)
  }
  
  # rule #5 (lines must be shorter than 76 chars, but we are not allowed
  # to break =XX escapes.  This makes things complicated :-( )
  my $brokenlines = "";
  $brokenlines .= $1.'='.$nl
    while $s =~ s/(.*?^[^$nl]{73} (?:
         [^=$nl]{2} (?! [^=$nl]{0,1} $) # 75 not followed by .?\n
        |[^=$nl]    (?! [^=$nl]{0,2} $) # 74 not followed by .?.?\n
        |           (?! [^=$nl]{0,3} $) # 73 not followed by .?.?.?\n
    ))//xsm;
  ($brokenlines.$s, 'quoted-printable');
}


## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
##           by Gisle Aas
sub decode_qp ($$) {
  my $yourself = shift;
  my $s = shift;
  $s =~ s/[\x09\x20]+(\x0D?\x0A)/$1/g;  # rule #3 (trailing space must be deleted)
  $s =~ s/[\x09\x20]+$//g;
  $s =~ s/=\x0D?\x0A//g;            # rule #5 (soft line breaks)
  $s =~ s/=([0-9A-Fa-f][0-9A-Fa-f])/pack('C', hex($1))/ge;
        ## Strictly, smallcases are not allowed
  ($s, 'binary');
}


sub uuencode ($$;%) {
  my $yourself = shift;
  my $s = shift;  my %p = @_;
  my %option = (mode => 644,    ## mode as (if:-)) decimal number
                filename => '', preamble => '', postamble => '',
                newline => "\x0D\x0A");
  for (grep {/^-/} keys %p) {$option{substr ($_, 1)} = $p{$_}}
  
  my $r = '';
  if (length $option{preamble}) {
    $option{preamble} .= $option{newline}
      unless $option{preamble} =~ /$option{newline}$/s;
    $r .= $option{preamble} . $option{newline};
  }
  $option{filename} = 'encoded-data' unless length $option{filename};
  $r .= sprintf 'begin %03d %s%s', @option{'mode', 'filename', 'newline'};
  my $u = pack 'u', $s;
  $u =~ s/\x0D?\x0A/$option{newline}/g;
  $r .= $u;
  $r .= 'end' . $option{newline};
  if (length $option{postamble}) {
    $option{postamble} .= $option{newline}
      unless $option{postamble} =~ /$option{newline}$/s;
    $r .= $option{newline} . $option{postamble};
  }
  ($r, 'x-uuencoded');
}

sub uudecode ($$) {
  my $yourself = shift;
  my $s = shift;
  my @s = split /\x0D?\x0A/, $s;
  
  ## Taken from MIME::Decoder::UU by Eryq (<eryq@zeegee.com>), 
  ## Revision: 5.403 / Date: 2000/11/04 19:54:49
  my ($mode, $filename, @preamble) = (0, '');
  while (defined ($_ = shift (@s))) {
    if (/^begin(.*)/) {        ### found it: now decode it...
      my $modefile = $1;
      if ($modefile =~ /^(?:\s+(\d+))?(?:\s+(.*?\S))?\s*\Z/) {
        ($mode, $filename) = ($1, $2);
      }
      last;                  ### decoded or not, we're done
    }
    push @preamble, $_;
  }
  if (!defined ($_)) {      # hit eof!
    Carp::carp "uu decode: No begin found";
    return ($s, 'x-uuencode');
  }
  
  ### Decode:
  my $r = '';
  while (defined ($_ = shift (@s))) {
    last if /^end/;
    next if /[a-z]/;
    next unless int((((ord() - 32) & 077) + 2) / 3) == int(length() / 4);
    $r .= (unpack('u', $_));
  }
  return ($r, 'binary', -filename => $filename, -mode => $mode,
                        -preamble => join ("\x0D\x0A", @preamble),
                        -postamble => join ("\x0D\x0A", @s));
}

sub uncompress_gzip ($$) {
  my $yourself = shift;
  my ($s) = @_;
  if (eval {require Compress::Zlib}) {
    ## Taken from Namazu <http://www.namazu.org/>, filter/gzip.pl
    my $flags = unpack('C', substr($s, 3, 1));
    $s = substr($s, 10);
    $s = substr($s, 2)  if ($flags & 0x04);
    $s =~ s/^[^\0]*\0// if ($flags & 0x08);
    $s =~ s/^[^\0]*\0// if ($flags & 0x10);
    $s = substr($s, 2)  if ($flags & 0x02);
    
    my $zl = Compress::Zlib::inflateInit
      (-WindowBits => - Compress::Zlib::MAX_WBITS());
    my ($inf, $stat) = $zl->inflate ($s);
    if ($stat == Compress::Zlib::Z_OK() || $stat == Compress::Zlib::Z_STREAM_END()) {
      return ($inf, 'identity');
    } else {
      Carp::carp 'uncompress_gzip: Bad compressed data';
    }
  } else {
    Carp::carp "gzip64 decode: $@";
  }
  ($_[1], 'gzip');      ## failue
}

=head1 SEE ALSO

For charset ENCODINGs, see Message::MIME::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: 2002/03/21 04:33:44 $

=cut

1;
1	wakaba	1.1
2			=head1 NAME
3
4			Message::MIME::Encoding --- Encoding (MIME CTE, HTTP encodings, etc) definitions
5
6			=cut
7
8			package Message::MIME::Encoding;
9			use strict;
10			use vars qw($VERSION);
11			$VERSION=do{my @r=(q$Revision: 1.1 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
12
13			our %ENCODER = (
14			'7bit' => sub { ($_[1], decide_coderange (@_[0,1])) },
15			'8bit' => sub { ($_[1], decide_coderange (@_[0,1])) },
16			binary => sub { ($_[1], decide_coderange (@_[0,1])) },
17			base64 => sub { require MIME::Base64;
18			(MIME::Base64::encode ($_[1]), 'base64') },
19			'quoted-printable' => \&encode_qp,
20			# => sub { require MIME::QuotedPrint;
21			# (MIME::QuotedPrint::encode ($_[1]), 'quoted-printable') },
22			'x-gzip64' => sub {
23			if (eval {require Compress::Zlib}) {
24			require MIME::Base64;
25			my $s = Compress::Zlib::memGzip ($_[1]);
26			(MIME::Base64::encode ($s), 'x-gzip64');
27			} else {
28			Carp::carp "gzip64 encode: $@";
29			($_[1], 'binary');
30			}
31			},
32			'x-uu' => \&uuencode,
33			'x-uue' => \&uuencode,
34			'x-uuencode' => \&uuencode,
35			'x-uuencoded' => \&uuencode,
36			);
37			our %DECODER = (
38			'7bit' => sub { ($_[1], 'binary') },
39			'8bit' => sub { ($_[1], 'binary') },
40			binary => sub { ($_[1], 'binary') },
41			base64 => sub { require MIME::Base64;
42			(MIME::Base64::decode ($_[1]), 'binary') },
43			'quoted-printable' => \&decode_qp,
44			# => sub { require MIME::QuotedPrint;
45			# (MIME::QuotedPrint::decode ($_[1]), 'binary') },
46			'x-gzip64' => sub {
47			require MIME::Base64;
48			my $s = MIME::Base64::decode ($_[1]);
49			my ($t, $e) = uncompress_gzip ($_[0], $s);
50			if ($e eq 'identity') { return ($t, 'binary') }
51			else { return ($_[1], 'x-gzip64') }
52			},
53			'x-uu' => \&uudecode,
54			'x-uue' => \&uudecode,
55			'x-uuencode' => \&uudecode,
56			'x-uuencoded' => \&uudecode,
57			);
58
59			sub decide_coderange ($$) {
60			my $yourself = shift;
61			my $s = shift; ## TODO: check media type and charset
62			return 'binary' if $s =~ /\x00/;
63			return 'binary' if $s =~ /\x0D(?!\x0A)/s;
64			#return 'binary' if $s =~ /(?<!\x0D)\x0A/s; ## BUG: does not work?
65			return '8bit' if $s =~ /[\x80-\xFF]/;
66			'7bit';
67			}
68
69			## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
70			## by Gisle Aas
71			sub encode_qp ($$) {
72			my $yourself = shift;
73			my $s = shift;
74			my $nl = "\x0D\x0A";
75			my $mt_is_text = 0;
76			my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
77			$mt_is_text = 1 if $mt eq 'text' \|\| $mt eq 'multipart' \|\| $mt eq 'message';
78			## RFC 2045 [^\x09\x20\x21-\x3C\x3E-\x7E]
79			## - RFC 2049 "mail-safe" [^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A]
80			$s =~ s/([^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A])/sprintf('=%02X', ord($1))/eg; # rule #2,#3
81			if ($mt_is_text) {
82			$s =~ s/([\x09\x20]+)(?==0D=0A\|$)/
83			join('', map { sprintf('=%02X', ord($_)) }
84			split('', $1)
85			)/egm; # rule #3 (encode whitespace at eol)
86			$s =~ s/=0D=0A/\x0D\x0A/g;
87			} else {
88			$s =~ s/([\x09\x20]+)$/
89			join('', map { sprintf('=%02X', ord($_)) }
90			split('', $1)
91			)/egm; # rule #3 (encode whitespace at eol)
92			}
93
94			# rule #5 (lines must be shorter than 76 chars, but we are not allowed
95			# to break =XX escapes. This makes things complicated :-( )
96			my $brokenlines = "";
97			$brokenlines .= $1.'='.$nl
98			while $s =~ s/(.*?^[^$nl]{73} (?:
99			[^=$nl]{2} (?! [^=$nl]{0,1} $) # 75 not followed by .?\n
100			\|[^=$nl] (?! [^=$nl]{0,2} $) # 74 not followed by .?.?\n
101			\| (?! [^=$nl]{0,3} $) # 73 not followed by .?.?.?\n
102			))//xsm;
103			($brokenlines.$s, 'quoted-printable');
104			}
105
106
107			## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
108			## by Gisle Aas
109			sub decode_qp ($$) {
110			my $yourself = shift;
111			my $s = shift;
112			$s =~ s/[\x09\x20]+(\x0D?\x0A)/$1/g; # rule #3 (trailing space must be deleted)
113			$s =~ s/[\x09\x20]+$//g;
114			$s =~ s/=\x0D?\x0A//g; # rule #5 (soft line breaks)
115			$s =~ s/=([0-9A-Fa-f][0-9A-Fa-f])/pack('C', hex($1))/ge;
116			## Strictly, smallcases are not allowed
117			($s, 'binary');
118			}
119
120
121			sub uuencode ($$;%) {
122			my $yourself = shift;
123			my $s = shift; my %p = @_;
124			my %option = (mode => 644, ## mode as (if:-)) decimal number
125			filename => '', preamble => '', postamble => '',
126			newline => "\x0D\x0A");
127			for (grep {/^-/} keys %p) {$option{substr ($_, 1)} = $p{$_}}
128
129			my $r = '';
130			if (length $option{preamble}) {
131			$option{preamble} .= $option{newline}
132			unless $option{preamble} =~ /$option{newline}$/s;
133			$r .= $option{preamble} . $option{newline};
134			}
135			$option{filename} = 'encoded-data' unless length $option{filename};
136			$r .= sprintf 'begin %03d %s%s', @option{'mode', 'filename', 'newline'};
137			my $u = pack 'u', $s;
138			$u =~ s/\x0D?\x0A/$option{newline}/g;
139			$r .= $u;
140			$r .= 'end' . $option{newline};
141			if (length $option{postamble}) {
142			$option{postamble} .= $option{newline}
143			unless $option{postamble} =~ /$option{newline}$/s;
144			$r .= $option{newline} . $option{postamble};
145			}
146			($r, 'x-uuencoded');
147			}
148
149			sub uudecode ($$) {
150			my $yourself = shift;
151			my $s = shift;
152			my @s = split /\x0D?\x0A/, $s;
153
154			## Taken from MIME::Decoder::UU by Eryq (<eryq@zeegee.com>),
155			## Revision: 5.403 / Date: 2000/11/04 19:54:49
156			my ($mode, $filename, @preamble) = (0, '');
157			while (defined ($_ = shift (@s))) {
158			if (/^begin(.*)/) { ### found it: now decode it...
159			my $modefile = $1;
160			if ($modefile =~ /^(?:\s+(\d+))?(?:\s+(.?\S))?\s\Z/) {
161			($mode, $filename) = ($1, $2);
162			}
163			last; ### decoded or not, we're done
164			}
165			push @preamble, $_;
166			}
167			if (!defined ($_)) { # hit eof!
168			Carp::carp "uu decode: No begin found";
169			return ($s, 'x-uuencode');
170			}
171
172			### Decode:
173			my $r = '';
174			while (defined ($_ = shift (@s))) {
175			last if /^end/;
176			next if /[a-z]/;
177			next unless int((((ord() - 32) & 077) + 2) / 3) == int(length() / 4);
178			$r .= (unpack('u', $_));
179			}
180			return ($r, 'binary', -filename => $filename, -mode => $mode,
181			-preamble => join ("\x0D\x0A", @preamble),
182			-postamble => join ("\x0D\x0A", @s));
183			}
184
185			sub uncompress_gzip ($$) {
186			my $yourself = shift;
187			my ($s) = @_;
188			if (eval {require Compress::Zlib}) {
189			## Taken from Namazu <http://www.namazu.org/>, filter/gzip.pl
190			my $flags = unpack('C', substr($s, 3, 1));
191			$s = substr($s, 10);
192			$s = substr($s, 2) if ($flags & 0x04);
193			$s =~ s/^[^\0]*\0// if ($flags & 0x08);
194			$s =~ s/^[^\0]*\0// if ($flags & 0x10);
195			$s = substr($s, 2) if ($flags & 0x02);
196
197			my $zl = Compress::Zlib::inflateInit
198			(-WindowBits => - Compress::Zlib::MAX_WBITS());
199			my ($inf, $stat) = $zl->inflate ($s);
200			if ($stat == Compress::Zlib::Z_OK() \|\| $stat == Compress::Zlib::Z_STREAM_END()) {
201			return ($inf, 'identity');
202			} else {
203			Carp::carp 'uncompress_gzip: Bad compressed data';
204			}
205			} else {
206			Carp::carp "gzip64 decode: $@";
207			}
208			($_[1], 'gzip'); ## failue
209			}
210
211			=head1 SEE ALSO
212
213			For charset ENCODINGs, see Message::MIME::Charset.
214
215			=head1 LICENSE
216
217			Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
218
219			This program is free software; you can redistribute it and/or modify
220			it under the terms of the GNU General Public License as published by
221			the Free Software Foundation; either version 2 of the License, or
222			(at your option) any later version.
223
224			This program is distributed in the hope that it will be useful,
225			but WITHOUT ANY WARRANTY; without even the implied warranty of
226			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
227			GNU General Public License for more details.
228
229			You should have received a copy of the GNU General Public License
230			along with this program; see the file COPYING. If not, write to
231			the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
232			Boston, MA 02111-1307, USA.
233
234			=head1 CHANGE
235
236			See F<ChangeLog>.
237			$Date: 2002/03/21 04:33:44 $
238
239			=cut
240
241			1;