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=head1 NAME
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Message::MIME::EncodedWord Perl module
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=head1 DESCRIPTION
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Perl module for MIME C<encoded-word>.
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=cut
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package Message::MIME::EncodedWord;
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use strict;
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use vars qw(%ENCODER %DECODER %OPTION %REG $VERSION);
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$VERSION=do{my @r=(q$Revision: 1.12 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
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require Message::MIME::Charset;
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$REG{WSP} = qr/[\x09\x20]/;
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$REG{FWS} = qr/[\x09\x20]*/;
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$REG{comment} = qr/\x28(?:\x5C[\x00-\xFF]|[\x00-\x0C\x0E-\x27\x2A-\x5B\x5D-\xFF]|(??{$REG{comment}}))*\x29/;
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$REG{atext_dot} = qr/[\x21\x23-\x27\x2A\x2B\x2D-\x39\x3D\x3F\x41-\x5A\x5E-\x7E]+/;
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$REG{attribute_char} = qr/[\x21\x23-\x24\x26\x2B\x2D\x2E\x30-\x39\x41-\x5A\x5E-\x7E]+/;
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$REG{M_comment} = qr/\x28((?:\x5C[\x00-\xFF]|[\x00-\x0C\x0E-\x27\x2A-\x5B\x5D-\xFF]|(??{$REG{comment}}))*)\x29/;
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$REG{M_encoded_word} = qr/=\x3F($REG{attribute_char})(?:\x2A($REG{attribute_char}))?\x3F($REG{attribute_char})\x3F([\x21-\x3E\x40-\x7E]+)\x3F=/;
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$REG{S_encoded_word} = qr/=\x3F$REG{atext_dot}\x3F=/;
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=head1 OPTIONS
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=cut
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%OPTION = (
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forcedecode => 0,
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);
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=over 4
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=item $Message::MIME::EncodedWord::OPTION{forcedecode} = 1/0
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When no charset decoder (See L<Message::MIME::Charset>)
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for C<ISO-8859-I<n>> is defined, and this option is TRUE,
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decoding C<encoded-word> functions attempt to decode
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ASCII part of these charset.
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RFC 2047 says that ASCII part of C<ISO-8859-I<n>> be at least
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supported. This requirement is convinience for human user who
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sees final rendering result. But it is not appropriate to process message.
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Defalt value is C<0>, force decoding is disenabled.
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=back
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=head2 Note
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Before you set new value for these options,
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C<Message::MIME::EncodedWord> should be loaded (C<require>ed).
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Other modules which use C<Message::MIME::EncodedWord>
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will automatically require this module, and this module
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will set initial (default) option value.
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Bad example:
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#! perl
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$Message::MIME::EncodedWord::OPTION{forcedecode} = 0;
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use Message::Field::Subject;
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my $subject = Message::Field::Subject->parse ($ARGV[0]);
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## At this time, M::F::Subject call M::M::EWord,
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## and $OPTION{forcedecode} is set C<1>, default value.
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Shold be:
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#! perl
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require Message::MIME::EncodedWord;
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$Message::MIME::EncodedWord::OPTION{forcedecode} = 0;
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use Message::Field::Subject;
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my $subject = Message::Field::Subject->parse ($ARGV[0]);
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## At this time, M::F::Subject call M::M::EWord,
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## but perl takes no action since it has already loaded.
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=cut
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%DECODER = (
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'*DEFAULT' => sub { $_[1] },
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'7' => sub { $_[1] },
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'8' => sub { $_[1] },
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b => sub {require MIME::Base64; MIME::Base64::decode ($_[1])},
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q => sub {my $s = $_[1]; $s =~ tr/_/\x20/;
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$s=~ s/=([0-9A-Fa-f]{2})/pack("C", hex($1))/ge; $s},
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);
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%ENCODER = (
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b => sub {require MIME::Base64; my $b = MIME::Base64::encode ($_[1]); $b =~ tr/\x00-\x20//d; ($b, {-encoded => 1})},
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q => \&_encode_q_encoding,
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);
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=head1 $string = Message::MIME::EncodedWord::decode ($text, %option)
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Decodes encoded-words in given text and return as a string (in internal code).
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Options:
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=over 4
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=item -process_non_encoded_word => CODE / 0 (default)
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Procedure for non-encoded-word string. This option can be useful
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with comment decoder to unquote quoted-pair and/or to decode 8-bit string
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of HTTP.
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=back
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=cut
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sub decode ($;%) {
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my @string = split /(?<=[^\x09\x20])(?=[\x09\x20])/, shift;
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my %option = @_;
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my @r; ## Token is encoded-word or not
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for my $i (0..$#string) {
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if ($string[$i] =~ m(^([\x09\x20]*)=\?([0-9A-Za-z!#\$%&'+^_`{|}~.-]{1,67})(?:\*([0-9A-Za-z!#\$&+^_`{|}~.-]{1,65}))?\?([0-9A-Za-z!#\$%&'*+^_`{|}~.-]{1,67})\?([\x21-\x3E\x40-\x7E]{1,67})\?=$)) {
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my ($t, $w) = ('', $1);
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($t, $r[$i]) = (_decode_eword ($2, $3, $4, $5));
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$string[$i] = ($i == 0 || !$r[$i-1] ? $w : '') . $t if $r[$i];
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} elsif (ref $option{-process_non_encoded_word}) {
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($string[$i], $r[$i]) = &{$option{-process_non_encoded_word}} ($string[$i], \%option);
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} else {
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$r[$i] = 0;
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}
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}
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join '', @string;
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}
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sub _decode_eword ($$$$) {
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my ($charset, $lang, $encoding, $etext) = (shift, shift, lc shift, shift);
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$charset = Message::MIME::Charset::name_normalize ($charset);
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my ($r,%s);
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if (ref $DECODER{$encoding}) { ## decode TE
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$r = &{$DECODER{$encoding}} ($encoding, $etext);
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($r,%s) = Message::MIME::Charset::decode ($charset, $r);
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}
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($r, $s{success});
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}
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sub decode_ccontent ($$) {
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use re 'eval';
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my $yourself = shift; my $s = shift;
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my (@s, @r) = ();
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my ($i, @t) = (-1);
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$s =~ s{$REG{FWS}$REG{comment}}{$i++; $t[$i] = $&; "\x28${i}\x29"}gex;
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$s =~ s{($REG{FWS}(?:\x5C[\x00-\xFF]
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|[\x00-\x08\x0A-\x1F\x21-\x27\x2A-\x5B\x5D-\xFF])+)
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|(\x28[0-9]+\x29)}{my ($t,$c) = ($1, $2);
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if ($t) {$i++; $t[$i] = $t; "\x28${i}\x29"}
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else {$c}}gex;
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$s =~ s{\x28([0-9]+)\x29}{push @s, $t[$1]; ''}gex;
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push @s, $s if length $s;
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for my $i (0..$#s) {
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if ($s[$i] =~ /^($REG{FWS})$REG{M_encoded_word}$/) {
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my ($t, $w) = ('', $1);
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($t, $r[$i]) = (_decode_eword ($2, $3, $4, $5));
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if ($r[$i]) {
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$s[$i] = $t;
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if ($i == 0 || $r[$i-1] == 0) {
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$s[$i] = $w.$s[$i];
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}
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}
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} elsif ($s[$i] =~ /^($REG{FWS})$REG{M_comment}$/) {
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$s[$i] = $1.'('. &decode_ccontent ($yourself, $2) .')';
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} else {
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$s[$i] =~ s/\x5C([\x00-\xFF])/$1/g;
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my %s = &{$yourself->{option}->{hook_decode_string}} ($yourself, $s[$i],
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type => 'ccontent/quoted');
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$s[$i] = $s{value};
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}
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}
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join '', @s;
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}
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=head1 $encoded_words = Message::MIME::EncodedWord::encode ($string, %option)
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Encode given string as encoded-words if necessary.
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Available options:
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=over 4
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=item -charset => charset (default: 'us-ascii')
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Charset name (in lower cases) to be used to encode the output string.
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(Currently 'us-ascii', 'iso-8859-1' and 'us-ascii' is supported.
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'iso-2022-int', 'euc-jp' or other charsets are unable to co-exist with
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encoded-words, in current implemention.)
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=item -context => 'default' (default) / 'comment' / 'phrase' / 'quoted_string'
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Context in which given string is embeded.
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=item -ebcdic_safe => 0/1 (default)
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Encode additional ASCII characters (shown in RFC 2047) that
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are not safe in EBCDIC transports. This option is meaningful only when
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"Q" encoding is used.
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=item -encode_char => 1*CHAR / '' (default)
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The list of ASCII characters should be encoded in encoded-word
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in addition to non-ASCII characters and special ASCII characters
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determined by C<-context> and C<-ebcdic_safe> options.
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=item -encode_encoded_word_like => 0/1 (default)
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Encode encoded-word-like tokens in given string or not.
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=item -preserve_wsp => 0/1 (default)
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If true, 2*WSP is encoded in encoded-word. Unless string is the content
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of comment or quoted-string, this option value should be true.
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=item -q_encode_char => 1*CHAR / '' (default)
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The list of ASCII characters should be encoded in q encoding of encoded-word
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in addition to non-ASCII characters and special ASCII characters
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determined by C<-context> and C<-ebcdic_safe> options.
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=item -quoted_pair => 1*CHAR / qr|(:: pattern ::)| '' (default)
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A character list or a Regexp pattern for characters to be quoted as
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the quoted-pairs. When '', no character is quoted.
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Quoting is performed to characters NOT encoded as encoded-words.
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This option should be useful if given string is to be a content
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of a comment or quoted-string. Usually, "\" is also included in
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the character list to represent "\" itself as "\\".
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=item -source_charset => charset (default = *internal)
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Charset name (in lower case) of given string.
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=item -token_maxlength => 1*DIGIT / 0 (default)
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Maximal length of a string (1*l<OCTET except WSP>) that can be represented
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as a non-encoded-word. If 0, no length limit is implied.
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Note that this option does NOT change maximal length of encoded-word.
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(Maximal length of encoded-word is always 75, as defined in RFC 2047.)
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=cut
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sub encode ($;%) {
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my $string = shift;
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my %option = @_;
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$option{-preserve_wsp} = 1 unless defined $option{-preserve_wsp};
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$option{-source_charset} ||= '*internal';
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my $re_encode = join ('|', grep {$_}
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(($option{-charset} eq 'utf-8' ? '' :
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$option{-charset} eq 'iso-8859-1' ? '[^\x00-\xFF]' : '[^\x00-\x7F]'),
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(defined $option{-encode_char} ? qq([$option{-encode_char}]) : ''),
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(!defined $option{-encode_encoded_word_like}||$option{-encode_encoded_word_like} ? '^=\?' :'')
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)) || '(?!)';
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if ($option{-quoted_pair} && !ref $option{-quoted_pair}) {
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$option{-quoted_pair} = quotemeta $option{-quoted_pair};
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$option{-quoted_pair} = qr/([$option{-quoted_pair}])/;
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}
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my @string = split /(?<=[^\x09\x20])(?=[\x09\x20])/, $string;
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my @encoded;
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for my $i (0..$#string) {
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my $string_nows = $string[$i];
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my $ws = ''; $ws = $1 if $string_nows =~ s/^([\x09\x20]+)//;
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$encoded[$i] = -1;
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if ($i == 0) { ## First component of string
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if ($string_nows =~ /$re_encode/ || ($option{-preserve_wsp} && length ($ws) > 1)
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|| ($option{-token_maxlength} && length ($string_nows) > $option{-token_maxlength})) {
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my $estring = _encode ($string[$i], \%option);
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if ($estring) {
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$string[$i] = $estring;
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$encoded[$i] = 1;
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}
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}
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} elsif ($i == $#string && length ($string_nows) == 0) { ## Last component of string is 1*WSP
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my $estring = _encode ($ws, \%option);
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if ($estring) {
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$string[$i] = ' ' . $estring;
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$encoded[$i] = 1;
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}
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} elsif ($i == 0 || !$encoded[$i-1]) { ## Previous token is not encoded
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if ($string_nows =~ /$re_encode/
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|| ($option{-token_maxlength} && length ($string_nows) > $option{-token_maxlength})) {
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if ($option{-preserve_wsp} && length ($ws) > 1 && $i) {
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$string_nows = substr ($ws, 1) . $string_nows;
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$ws = substr ($ws, 0, 1);
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| 288 |
} elsif (!$ws) {
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$ws = ' ';
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}
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my $estring = _encode ($string_nows, \%option);
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| 292 |
if ($estring) {
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$string[$i] = $ws . $estring;
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$encoded[$i] = 1;
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}
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| 296 |
} elsif ($option{-preserve_wsp} && length ($ws) == 2) {
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| 297 |
my $estring = _encode (substr ($ws, 1) . $string_nows, \%option);
|
| 298 |
if ($estring) {
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| 299 |
$string[$i] = substr ($ws, 0, 1) . $estring;
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| 300 |
$encoded[$i] = 1;
|
| 301 |
}
|
| 302 |
} elsif ($option{-preserve_wsp} && length ($ws) > 2) {
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| 303 |
my $estring = _encode (substr ($ws, 1, length ($ws) - 2), \%option);
|
| 304 |
if ($estring) {
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| 305 |
$string_nows =~ s/$option{-quoted_pair}/\\$1/g if $option{-quoted_pair};
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| 306 |
$string[$i] = substr ($ws, 0, 1) . $estring . substr ($ws, -1) . $string_nows;
|
| 307 |
$encoded[$i] = 0;
|
| 308 |
}
|
| 309 |
}
|
| 310 |
} else { ## Previous token is encoded
|
| 311 |
if ($string_nows =~ /$re_encode/
|
| 312 |
|| ($option{-token_maxlength} && length ($string_nows) > $option{-token_maxlength})) {
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| 313 |
my $estring = _encode ($string[$i], \%option);
|
| 314 |
if ($estring) {
|
| 315 |
$string[$i] = ($i!=0?' ':'') . $estring;
|
| 316 |
$encoded[$i] = 1;
|
| 317 |
}
|
| 318 |
} elsif ($option{-preserve_wsp} && length ($ws) > 1) {
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| 319 |
my $estring = _encode (substr ($ws, 0, length ($ws) - 1), \%option);
|
| 320 |
if ($estring) {
|
| 321 |
$string_nows =~ s/$option{-quoted_pair}/\\$1/g if $option{-quoted_pair};
|
| 322 |
$string[$i] = ($i!=0?' ':'') . $estring . substr ($ws, -1) . $string_nows;
|
| 323 |
$encoded[$i] = 0;
|
| 324 |
}
|
| 325 |
}
|
| 326 |
}
|
| 327 |
if ($encoded[$i] == -1) {
|
| 328 |
$string[$i] =~ s/$option{-quoted_pair}/\\$1/g if $option{-quoted_pair};
|
| 329 |
$encoded[$i] = 0;
|
| 330 |
}
|
| 331 |
}
|
| 332 |
join '', @string;
|
| 333 |
}
|
| 334 |
|
| 335 |
## $encoded_text must be octet string (not utf8 string).
|
| 336 |
sub _encode_q_encoding ($$;\%) {
|
| 337 |
my ($encoding, $encoded_text, $option) = @_;
|
| 338 |
## -- What characters are encoded?
|
| 339 |
my $achar = {
|
| 340 |
default => q(!"#$%&'()*+,./0123456789:;<>@ABCDEFGHIJKLMNOPQRSTUVWXYZ^`abcdefghijklmnopqrstuvwxyz{|}~\\[]-),
|
| 341 |
comment => q(!"#$%&'*+,./0123456789:;<>@ABCDEFGHIJKLMNOPQRSTUVWXYZ^`abcdefghijklmnopqrstuvwxyz{|}~[]-),
|
| 342 |
phrase => q(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!*+/-),
|
| 343 |
quoted_string => q(!#$%&'()*+,./0123456789:;<>@ABCDEFGHIJKLMNOPQRSTUVWXYZ^`abcdefghijklmnopqrstuvwxyz{|}~[]-),
|
| 344 |
}->{$option->{-context} || 'default'};
|
| 345 |
my $echar = $option->{-q_encode_char}; $echar =~ s/([\/\\])/\\$1/g;
|
| 346 |
eval qq{\$achar =~ tr/$echar//d};
|
| 347 |
$achar =~ tr/!"#$@[\\]^`{|}~//d unless defined $option->{-ebcdic_safe} && $option->{-ebcdic_safe} == 0;
|
| 348 |
$achar = quotemeta $achar;
|
| 349 |
## -- Encode
|
| 350 |
$encoded_text =~ s/([^$achar])/sprintf '=%02X', ord $1/ge;
|
| 351 |
$encoded_text =~ s/=20/_/g;
|
| 352 |
($encoded_text, {-encoded => 1});
|
| 353 |
}
|
| 354 |
sub _encode ($$) {
|
| 355 |
my $option = $_[1];
|
| 356 |
my $charset = $option->{-source_charset};
|
| 357 |
my $encoding = Message::MIME::Charset::get_property ('cte_header_preferred', $charset);
|
| 358 |
my @estr;
|
| 359 |
for my $str (@{Message::MIME::Charset::divide_string ($charset, $_[0], -max => int ((75 - length ($charset.$encoding) - 6) * ({b=>3/4,q=>1/3}->{$encoding}||1)))}) {
|
| 360 |
my $echarset = Message::MIME::Charset::get_interchange_charset ($charset, $str, $option)->{charset} || $charset;
|
| 361 |
my ($estr, %r) = Message::MIME::Charset::encode ($echarset, $str);
|
| 362 |
do {$echarset = $charset; $estr = $str; Message::MIME::Charset::_utf8_off ($estr)} unless $r{success};
|
| 363 |
$encoding = Message::MIME::Charset::get_property ('cte_header_preferred', $echarset);
|
| 364 |
if ($encoding eq '*auto') {
|
| 365 |
$encoding = (($estr =~ tr/\x20-\x7E/\x20-\x7E/) < (length ($estr) * 0.55)) ? 'b' : 'q';
|
| 366 |
}
|
| 367 |
my ($s, $r) = &{$ENCODER{$encoding}} ($encoding, $estr, $option);
|
| 368 |
if ($r->{-encoded}) { ## Success
|
| 369 |
my $echarset = {Message::MIME::Charset::name_minimumize ($echarset, $estr, {-name_only=>1})}->{charset};
|
| 370 |
push @estr, sprintf ('=?%s?%s?%s?=', $echarset, $encoding, $s);
|
| 371 |
} else {
|
| 372 |
return undef;
|
| 373 |
}
|
| 374 |
}
|
| 375 |
join ' ', @estr;
|
| 376 |
}
|
| 377 |
|
| 378 |
|
| 379 |
=head1 LICENSE
|
| 380 |
|
| 381 |
Copyright 2002 Wakaba <[email protected]>.
|
| 382 |
|
| 383 |
This program is free software; you can redistribute it and/or modify
|
| 384 |
it under the terms of the GNU General Public License as published by
|
| 385 |
the Free Software Foundation; either version 2 of the License, or
|
| 386 |
(at your option) any later version.
|
| 387 |
|
| 388 |
This program is distributed in the hope that it will be useful,
|
| 389 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 390 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 391 |
GNU General Public License for more details.
|
| 392 |
|
| 393 |
You should have received a copy of the GNU General Public License
|
| 394 |
along with this program; see the file COPYING. If not, write to
|
| 395 |
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
| 396 |
Boston, MA 02111-1307, USA.
|
| 397 |
|
| 398 |
=cut
|
| 399 |
|
| 400 |
1; # $Date: 2002/12/28 09:07:05 $
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