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=head1 NAME
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Message::MIME::Encoding --- Encoding (MIME CTE, HTTP encodings, etc) definitions
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=cut
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package Message::MIME::Encoding;
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use strict;
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use vars qw($VERSION);
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$VERSION=do{my @r=(q$Revision: 1.8 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
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our %ENCODER = (
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'7bit' => sub { ($_[1], decide_coderange (@_)) },
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'8bit' => sub { ($_[1], decide_coderange (@_)) },
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binary => sub { ($_[1], decide_coderange (@_)) },
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base64 => \&encode_base64,
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'quoted-printable' => \&encode_qp,
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'x-gzip64' => sub {
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if (eval {require Compress::Zlib}) {
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((encode_base64 (Compress::Zlib::memGzip ($_[1])))[0], 'x-gzip64');
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} else {
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Carp::carp "gzip64 encode: $@";
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($_[1], 'binary');
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}
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},
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'x-uu' => \&uuencode,
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'x-uue' => \&uuencode,
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'x-uuencode' => \&uuencode,
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'x-uuencoded' => \&uuencode,
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);
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our %DECODER = (
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'7bit' => sub { ($_[1], 'binary') },
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'8bit' => sub { ($_[1], 'binary') },
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binary => sub { ($_[1], 'binary') },
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base64 => \&decode_base64,
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'quoted-printable' => \&decode_qp,
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'x-gzip64' => sub {
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my ($t, $e) = uncompress_gzip ($_[0], (decode_base64 ($_[0], $_[1]))[0]);
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if ($e eq 'identity') { return ($t, 'binary') }
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else { return ($_[1], 'x-gzip64') }
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},
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'x-uu' => \&uudecode,
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'x-uue' => \&uudecode,
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'x-uuencode' => \&uudecode,
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'x-uuencoded' => \&uudecode,
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);
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sub decide_coderange ($$\%) {
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my $yourself = shift;
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my $s = shift;
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my $option = shift;
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if (!defined $option->{mt_is_text}) {
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my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
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$option->{mt_is_text} = 1
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if $mt eq 'text' || $mt eq 'multipart' || $mt eq 'message';
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}
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if (!defined $option->{linebreak_strict}) {
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$option->{linebreak_strict} = $yourself->{option}->{linebreak_strict};
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}
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return 'binary' if $s =~ /\x00/;
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if ($option->{mt_is_text}) {
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if ($option->{linebreak_strict}) {
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return 'binary' if $s =~ /\x0D(?!\x0A)/s;
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return 'binary' if $s =~ /(?<!\x0D)\x0A/s;
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}
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} else {
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return 'binary';
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#return 'binary' if $s =~ /\x0D|\x0A/s;
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## RFC 2045: nor is labelling unencoded non-line-oriented data as
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## anything other than "binary" allowed.
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}
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return 'binary' if $s =~ /[^\x0D\x0A]{999}/;
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return '8bit' if $s =~ /[\x80-\xFF]/;
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'7bit';
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}
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## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
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## by Gisle Aas
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sub encode_qp ($$) {
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my $yourself = shift;
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my $s = shift;
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my $nl = "\x0D\x0A";
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my $enl = "=0D=0A";
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unless ($yourself->{option}->{linebreak_strict}) {
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$nl = Message::Util::decide_newline ($s);
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$enl = $nl; $enl =~ s/\x0D/=0D/s; $enl =~ s/\x0A/=0A/s;
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}
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my $mt_is_text = 0;
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my $mt; $mt = ($yourself->content_type)[0] if ref $yourself;
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$mt_is_text = 1 if $mt eq 'text' || $mt eq 'multipart' || $mt eq 'message';
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## RFC 2045 [^\x09\x20\x21-\x3C\x3E-\x7E]
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## - RFC 2049 "mail-safe" [^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A]
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$s =~ s/([^\x09\x20\x25-\x3C\x3E\x3F\x41-\x5A\x5F\x61-\x7A])/sprintf('=%02X', ord($1))/eg; # rule #2,#3
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if ($mt_is_text) {
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$s =~ s/([\x09\x20])(?=$enl|$)/
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sprintf '=%02X', ord($1)
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#join('', map { sprintf('=%02X', ord($_)) } split('', $1) )
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/egm; # rule #3 (encode whitespace at eol)
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$s =~ s/${enl}From/$nl=46rom/g;
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$s =~ s/${enl}-/$nl=2D/g;
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$s =~ s/$enl/$nl/g;
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} else {
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$s =~ s/([\x09\x20])$/
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sprintf '=%02X', ord($1)
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#join('', map { sprintf('=%02X', ord($_)) } split('', $1) )
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/egm; # rule #3 (encode whitespace at eol)
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}
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# rule #5 (lines must be shorter than 76 chars, but we are not allowed
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# to break =XX escapes. This makes things complicated :-( )
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my $brokenlines = "";
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$brokenlines .= $1.'='.$nl
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while $s =~ s/(.*?^[^$nl]{73} (?:
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[^=$nl]{2} (?! [^=$nl]{0,1} $) # 75 not followed by .?\n
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|[^=$nl] (?! [^=$nl]{0,2} $) # 74 not followed by .?.?\n
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| (?! [^=$nl]{0,3} $) # 73 not followed by .?.?.?\n
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))//xsm;
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($brokenlines.$s, 'quoted-printable');
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}
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## Original: MIME::QuotedPrint Revision: 2.3 1997/12/02 10:24:27
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## by Gisle Aas
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sub decode_qp ($$) {
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my $yourself = shift;
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my $s = shift;
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$s =~ s/[\x09\x20]+(\x0D?\x0A)/$1/g; # rule #3 (trailing space must be deleted)
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$s =~ s/[\x09\x20]+$//g;
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$s =~ s/=\x0D?\x0A//g; # rule #5 (soft line breaks)
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$s =~ s/=([0-9A-Fa-f][0-9A-Fa-f])/pack('C', hex($1))/ge;
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## Strictly, smallcases are not allowed
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($s, 'binary');
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}
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sub encode_base64 ($$;%) {
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require MIME::Base64;
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my ($yourself, $s, %option) = @_;
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$s = MIME::Base64::encode ($s);
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$s =~ s/\x0D(?!\x0A)/\x0D\x0A/gs;
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$s =~ s/(?<!\x0D)\x0A/\x0D\x0A/gs;
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($s, 'base64');
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}
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sub decode_base64 ($$;%) {
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require MIME::Base64;
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my ($yourself, $s, %option) = @_;
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$s = MIME::Base64::decode ($s);
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($s, 'binary');
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}
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sub uuencode ($$;%) {
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my $yourself = shift;
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my $s = shift; my %p = @_;
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my %option = (mode => 644, ## mode as (if:-)) decimal number
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filename => '', preamble => '', postamble => '',
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newline => "\x0D\x0A");
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for (grep {/^-/} keys %p) {$option{substr ($_, 1)} = $p{$_}}
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my $r = '';
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if (length $option{preamble}) {
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$option{preamble} .= $option{newline}
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unless $option{preamble} =~ /$option{newline}$/s;
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$r .= $option{preamble} . $option{newline};
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}
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$option{filename} = 'encoded-data' unless length $option{filename};
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$r .= sprintf 'begin %03d %s%s', @option{'mode', 'filename', 'newline'};
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my $u = pack 'u', $s;
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$u =~ s/\x0D?\x0A/$option{newline}/g;
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$r .= $u;
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$r .= 'end' . $option{newline};
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if (length $option{postamble}) {
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$option{postamble} .= $option{newline}
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unless $option{postamble} =~ /$option{newline}$/s;
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$r .= $option{newline} . $option{postamble};
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}
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($r, 'x-uuencode');
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}
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sub uudecode ($$) {
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my $yourself = shift;
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my $s = shift;
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my @s = split /\x0D?\x0A/, $s;
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## Taken from MIME::Decoder::UU by Eryq (<eryq@zeegee.com>),
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## Revision: 5.403 / Date: 2000/11/04 19:54:49
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my ($mode, $filename, @preamble) = (0, '');
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while (defined ($_ = shift (@s))) {
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if (/^begin(.*)/) { ### found it: now decode it...
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my $modefile = $1;
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if ($modefile =~ /^(?:\s+(\d+))?(?:\s+(.*?\S))?\s*\Z/) {
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($mode, $filename) = ($1, $2);
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}
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last; ### decoded or not, we're done
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}
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push @preamble, $_;
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}
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if (!defined ($_)) { # hit eof!
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Carp::carp "uu decode: No begin found";
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return ($s, 'x-uuencode');
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}
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### Decode:
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my $r = '';
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while (defined ($_ = shift (@s))) {
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last if /^end/;
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next if /[a-z]/;
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next unless int((((ord() - 32) & 077) + 2) / 3) == int(length() / 4);
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$r .= (unpack('u', $_));
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}
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return ($r, 'binary', -filename => $filename, -mode => $mode,
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-preamble => join ("\x0D\x0A", @preamble),
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-postamble => join ("\x0D\x0A", @s));
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}
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sub uncompress_gzip ($$) {
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my $yourself = shift;
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my ($s) = @_;
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if (eval {require Compress::Zlib}) {
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## Taken from Namazu <http://www.namazu.org/>, filter/gzip.pl
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my $flags = unpack('C', substr($s, 3, 1));
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$s = substr($s, 10);
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$s = substr($s, 2) if ($flags & 0x04);
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$s =~ s/^[^\0]*\0// if ($flags & 0x08);
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$s =~ s/^[^\0]*\0// if ($flags & 0x10);
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$s = substr($s, 2) if ($flags & 0x02);
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my $zl = Compress::Zlib::inflateInit
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(-WindowBits => - Compress::Zlib::MAX_WBITS());
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my ($inf, $stat) = $zl->inflate ($s);
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if ($stat == Compress::Zlib::Z_OK() || $stat == Compress::Zlib::Z_STREAM_END()) {
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return ($inf, 'identity');
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} else {
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Carp::carp 'uncompress_gzip: Bad compressed data';
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}
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} else {
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Carp::carp "gzip64 decode: $@";
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}
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($_[1], 'gzip'); ## failue
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}
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=head1 SEE ALSO
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For charset ENCODINGs, see Message::MIME::Charset.
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=head1 LICENSE
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Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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=head1 CHANGE
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See F<ChangeLog>.
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$Date: 2002/07/20 03:11:47 $
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=cut
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