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: 1.9 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};

our %ENCODER = (
        '7bit'  => sub { ($_[1], decide_coderange (@_)) },
        '8bit'  => sub { ($_[1], decide_coderange (@_)) },
        binary  => sub { ($_[1], decide_coderange (@_)) },
        base64  => \&encode_base64,
        'quoted-printable'      => \&encode_qp,
        'x-gzip64' => sub {
                if (eval {require Compress::Zlib}) {
                  ((encode_base64 (Compress::Zlib::memGzip ($_[1])))[0], '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 { ($_[1], 'binary') },
        base64  => \&decode_base64,
        'quoted-printable'      => \&decode_qp,
        'x-gzip64'      => sub {
                my ($t, $e) = uncompress_gzip ($_[0], (decode_base64 ($_[0], $_[1]))[0]);
                if ($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;
  my $option = shift;
  if (!defined $option->{mt_is_text}) {
    my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
    $option->{mt_is_text} = 1
      if $mt eq 'text' || $mt eq 'multipart' || $mt eq 'message';
  }
  if (!defined $option->{linebreak_strict}) {
    $option->{linebreak_strict} = $yourself->{option}->{linebreak_strict};
  }
  return 'binary' if $s =~ /\x00/;
  if ($option->{mt_is_text}) {
    if ($option->{linebreak_strict}) {
      return 'binary' if $s =~ /\x0D(?!\x0A)/s;
      return 'binary' if $s =~ /(?<!\x0D)\x0A/s;
    }
  } else {
    return 'binary';
    #return 'binary' if $s =~ /\x0D|\x0A/s;
    ## RFC 2045: nor is labelling unencoded non-line-oriented data as
    ##           anything other than "binary" allowed.
  }
  return 'binary' if $s =~ /[^\x0D\x0A]{999}/;
  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 $enl = "=0D=0A";
  unless ($yourself->{option}->{linebreak_strict}) {
    $nl = Message::Util::decide_newline ($s);
    $enl = $nl; $enl =~ s/\x0D/=0D/s; $enl =~ s/\x0A/=0A/s;
  }
  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) {
    $s =~ s/([\x09\x20])(?=$enl|$)/
      sprintf '=%02X', ord($1)
      #join('', map { sprintf('=%02X', ord($_)) } split('', $1) )
    /egm;                        # rule #3 (encode whitespace at eol)
    $s =~ s/${enl}From/$nl=46rom/g;
    $s =~ s/${enl}-/$nl=2D/g;
    $s =~ s/$enl/$nl/g;
  } else {
    $s =~ s/([\x09\x20])$/
      sprintf '=%02X', ord($1)
      #join('', map { sprintf('=%02X', ord($_)) } 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 encode_base64 ($$;%) {
  require MIME::Base64;
  my ($yourself, $s, %option) = @_;
  $s = MIME::Base64::encode ($s);
  $s =~ s/\x0D(?!\x0A)/\x0D\x0A/gs;
  $s =~ s/(?<!\x0D)\x0A/\x0D\x0A/gs;
  ($s, 'base64');
}

sub decode_base64 ($$;%) {
  require MIME::Base64;
  my ($yourself, $s, %option) = @_;
  $s = MIME::Base64::decode ($s);
  ($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-uuencode');
}

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: 2002/07/27 04:44:25 $

=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	wakaba	1.9	$VERSION=do{my @r=(q$Revision: 1.9 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
12	wakaba	1.1
13			our %ENCODER = (
14	wakaba	1.9	'7bit' => sub { ($_[1], decide_coderange (@_)) },
15			'8bit' => sub { ($_[1], decide_coderange (@_)) },
16			binary => sub { ($_[1], decide_coderange (@_)) },
17			base64 => \&encode_base64,
18	wakaba	1.1	'quoted-printable' => \&encode_qp,
19			'x-gzip64' => sub {
20			if (eval {require Compress::Zlib}) {
21	wakaba	1.9	((encode_base64 (Compress::Zlib::memGzip ($_[1])))[0], 'x-gzip64');
22	wakaba	1.1	} else {
23			Carp::carp "gzip64 encode: $@";
24			($_[1], 'binary');
25			}
26			},
27			'x-uu' => \&uuencode,
28			'x-uue' => \&uuencode,
29			'x-uuencode' => \&uuencode,
30			'x-uuencoded' => \&uuencode,
31			);
32			our %DECODER = (
33			'7bit' => sub { ($_[1], 'binary') },
34			'8bit' => sub { ($_[1], 'binary') },
35			binary => sub { ($_[1], 'binary') },
36	wakaba	1.9	base64 => \&decode_base64,
37	wakaba	1.1	'quoted-printable' => \&decode_qp,
38			'x-gzip64' => sub {
39	wakaba	1.9	my ($t, $e) = uncompress_gzip ($_[0], (decode_base64 ($_[0], $_[1]))[0]);
40	wakaba	1.1	if ($e eq 'identity') { return ($t, 'binary') }
41			else { return ($_[1], 'x-gzip64') }
42			},
43			'x-uu' => \&uudecode,
44			'x-uue' => \&uudecode,
45			'x-uuencode' => \&uudecode,
46			'x-uuencoded' => \&uudecode,
47			);
48
49	wakaba	1.2	sub decide_coderange ($$\%) {
50	wakaba	1.1	my $yourself = shift;
51	wakaba	1.2	my $s = shift;
52			my $option = shift;
53			if (!defined $option->{mt_is_text}) {
54			my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
55			$option->{mt_is_text} = 1
56			if $mt eq 'text' \|\| $mt eq 'multipart' \|\| $mt eq 'message';
57			}
58	wakaba	1.7	if (!defined $option->{linebreak_strict}) {
59			$option->{linebreak_strict} = $yourself->{option}->{linebreak_strict};
60			}
61	wakaba	1.1	return 'binary' if $s =~ /\x00/;
62	wakaba	1.2	if ($option->{mt_is_text}) {
63	wakaba	1.7	if ($option->{linebreak_strict}) {
64			return 'binary' if $s =~ /\x0D(?!\x0A)/s;
65			return 'binary' if $s =~ /(?<!\x0D)\x0A/s;
66			}
67	wakaba	1.2	} else {
68	wakaba	1.6	return 'binary';
69			#return 'binary' if $s =~ /\x0D\|\x0A/s;
70			## RFC 2045: nor is labelling unencoded non-line-oriented data as
71			## anything other than "binary" allowed.
72	wakaba	1.2	}
73	wakaba	1.3	return 'binary' if $s =~ /[^\x0D\x0A]{999}/;
74	wakaba	1.1	return '8bit' if $s =~ /[\x80-\xFF]/;
75			'7bit';
76			}
77
78			## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
79			## by Gisle Aas
80			sub encode_qp ($$) {
81			my $yourself = shift;
82			my $s = shift;
83			my $nl = "\x0D\x0A";
84	wakaba	1.7	my $enl = "=0D=0A";
85			unless ($yourself->{option}->{linebreak_strict}) {
86			$nl = Message::Util::decide_newline ($s);
87			$enl = $nl; $enl =~ s/\x0D/=0D/s; $enl =~ s/\x0A/=0A/s;
88			}
89	wakaba	1.1	my $mt_is_text = 0;
90			my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
91			$mt_is_text = 1 if $mt eq 'text' \|\| $mt eq 'multipart' \|\| $mt eq 'message';
92			## RFC 2045 [^\x09\x20\x21-\x3C\x3E-\x7E]
93			## - RFC 2049 "mail-safe" [^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A]
94			$s =~ s/([^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A])/sprintf('=%02X', ord($1))/eg; # rule #2,#3
95			if ($mt_is_text) {
96	wakaba	1.7	$s =~ s/([\x09\x20])(?=$enl\|$)/
97	wakaba	1.4	sprintf '=%02X', ord($1)
98			#join('', map { sprintf('=%02X', ord($_)) } split('', $1) )
99			/egm; # rule #3 (encode whitespace at eol)
100	wakaba	1.7	$s =~ s/${enl}From/$nl=46rom/g;
101	wakaba	1.8	$s =~ s/${enl}-/$nl=2D/g;
102	wakaba	1.7	$s =~ s/$enl/$nl/g;
103	wakaba	1.1	} else {
104	wakaba	1.4	$s =~ s/([\x09\x20])$/
105			sprintf '=%02X', ord($1)
106			#join('', map { sprintf('=%02X', ord($_)) } split('', $1) )
107			/egm; # rule #3 (encode whitespace at eol)
108	wakaba	1.1	}
109
110			# rule #5 (lines must be shorter than 76 chars, but we are not allowed
111			# to break =XX escapes. This makes things complicated :-( )
112			my $brokenlines = "";
113			$brokenlines .= $1.'='.$nl
114			while $s =~ s/(.*?^[^$nl]{73} (?:
115			[^=$nl]{2} (?! [^=$nl]{0,1} $) # 75 not followed by .?\n
116			\|[^=$nl] (?! [^=$nl]{0,2} $) # 74 not followed by .?.?\n
117			\| (?! [^=$nl]{0,3} $) # 73 not followed by .?.?.?\n
118			))//xsm;
119			($brokenlines.$s, 'quoted-printable');
120			}
121
122
123			## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
124			## by Gisle Aas
125			sub decode_qp ($$) {
126			my $yourself = shift;
127			my $s = shift;
128			$s =~ s/[\x09\x20]+(\x0D?\x0A)/$1/g; # rule #3 (trailing space must be deleted)
129			$s =~ s/[\x09\x20]+$//g;
130			$s =~ s/=\x0D?\x0A//g; # rule #5 (soft line breaks)
131			$s =~ s/=([0-9A-Fa-f][0-9A-Fa-f])/pack('C', hex($1))/ge;
132			## Strictly, smallcases are not allowed
133			($s, 'binary');
134			}
135
136	wakaba	1.9	sub encode_base64 ($$;%) {
137			require MIME::Base64;
138			my ($yourself, $s, %option) = @_;
139			$s = MIME::Base64::encode ($s);
140			$s =~ s/\x0D(?!\x0A)/\x0D\x0A/gs;
141			$s =~ s/(?<!\x0D)\x0A/\x0D\x0A/gs;
142			($s, 'base64');
143			}
144
145			sub decode_base64 ($$;%) {
146			require MIME::Base64;
147			my ($yourself, $s, %option) = @_;
148			$s = MIME::Base64::decode ($s);
149			($s, 'binary');
150			}
151	wakaba	1.1
152			sub uuencode ($$;%) {
153			my $yourself = shift;
154			my $s = shift; my %p = @_;
155			my %option = (mode => 644, ## mode as (if:-)) decimal number
156			filename => '', preamble => '', postamble => '',
157			newline => "\x0D\x0A");
158			for (grep {/^-/} keys %p) {$option{substr ($_, 1)} = $p{$_}}
159
160			my $r = '';
161			if (length $option{preamble}) {
162			$option{preamble} .= $option{newline}
163			unless $option{preamble} =~ /$option{newline}$/s;
164			$r .= $option{preamble} . $option{newline};
165			}
166			$option{filename} = 'encoded-data' unless length $option{filename};
167			$r .= sprintf 'begin %03d %s%s', @option{'mode', 'filename', 'newline'};
168			my $u = pack 'u', $s;
169			$u =~ s/\x0D?\x0A/$option{newline}/g;
170			$r .= $u;
171			$r .= 'end' . $option{newline};
172			if (length $option{postamble}) {
173			$option{postamble} .= $option{newline}
174			unless $option{postamble} =~ /$option{newline}$/s;
175			$r .= $option{newline} . $option{postamble};
176			}
177	wakaba	1.2	($r, 'x-uuencode');
178	wakaba	1.1	}
179
180			sub uudecode ($$) {
181			my $yourself = shift;
182			my $s = shift;
183			my @s = split /\x0D?\x0A/, $s;
184
185			## Taken from MIME::Decoder::UU by Eryq (<eryq@zeegee.com>),
186			## Revision: 5.403 / Date: 2000/11/04 19:54:49
187			my ($mode, $filename, @preamble) = (0, '');
188			while (defined ($_ = shift (@s))) {
189			if (/^begin(.*)/) { ### found it: now decode it...
190			my $modefile = $1;
191			if ($modefile =~ /^(?:\s+(\d+))?(?:\s+(.?\S))?\s\Z/) {
192			($mode, $filename) = ($1, $2);
193			}
194			last; ### decoded or not, we're done
195			}
196			push @preamble, $_;
197			}
198			if (!defined ($_)) { # hit eof!
199			Carp::carp "uu decode: No begin found";
200			return ($s, 'x-uuencode');
201			}
202
203			### Decode:
204			my $r = '';
205			while (defined ($_ = shift (@s))) {
206			last if /^end/;
207			next if /[a-z]/;
208			next unless int((((ord() - 32) & 077) + 2) / 3) == int(length() / 4);
209			$r .= (unpack('u', $_));
210			}
211			return ($r, 'binary', -filename => $filename, -mode => $mode,
212			-preamble => join ("\x0D\x0A", @preamble),
213			-postamble => join ("\x0D\x0A", @s));
214			}
215
216			sub uncompress_gzip ($$) {
217			my $yourself = shift;
218			my ($s) = @_;
219			if (eval {require Compress::Zlib}) {
220			## Taken from Namazu <http://www.namazu.org/>, filter/gzip.pl
221			my $flags = unpack('C', substr($s, 3, 1));
222			$s = substr($s, 10);
223			$s = substr($s, 2) if ($flags & 0x04);
224			$s =~ s/^[^\0]*\0// if ($flags & 0x08);
225			$s =~ s/^[^\0]*\0// if ($flags & 0x10);
226			$s = substr($s, 2) if ($flags & 0x02);
227
228			my $zl = Compress::Zlib::inflateInit
229			(-WindowBits => - Compress::Zlib::MAX_WBITS());
230			my ($inf, $stat) = $zl->inflate ($s);
231			if ($stat == Compress::Zlib::Z_OK() \|\| $stat == Compress::Zlib::Z_STREAM_END()) {
232			return ($inf, 'identity');
233			} else {
234			Carp::carp 'uncompress_gzip: Bad compressed data';
235			}
236			} else {
237			Carp::carp "gzip64 decode: $@";
238			}
239			($_[1], 'gzip'); ## failue
240			}
241
242			=head1 SEE ALSO
243
244			For charset ENCODINGs, see Message::MIME::Charset.
245
246			=head1 LICENSE
247
248			Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
249
250			This program is free software; you can redistribute it and/or modify
251			it under the terms of the GNU General Public License as published by
252			the Free Software Foundation; either version 2 of the License, or
253			(at your option) any later version.
254
255			This program is distributed in the hope that it will be useful,
256			but WITHOUT ANY WARRANTY; without even the implied warranty of
257			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
258			GNU General Public License for more details.
259
260			You should have received a copy of the GNU General Public License
261			along with this program; see the file COPYING. If not, write to
262			the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
263			Boston, MA 02111-1307, USA.
264
265			=head1 CHANGE
266
267			See F<ChangeLog>.
268	wakaba	1.9	$Date: 2002/07/27 04:44:25 $
269	wakaba	1.1
270			=cut
271
272			1;