/usr/lib/perl5/Encode/MIME/Header/ISO_2022_JP.pm is in libencode-perl 2.44-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | package Encode::MIME::Header::ISO_2022_JP;
use strict;
use warnings;
use base qw(Encode::MIME::Header);
$Encode::Encoding{'MIME-Header-ISO_2022_JP'} =
bless { encode => 'B', bpl => 76, Name => 'MIME-Header-ISO_2022_JP' } =>
__PACKAGE__;
use constant HEAD => '=?ISO-2022-JP?B?';
use constant TAIL => '?=';
use Encode::CJKConstants qw(%RE);
our $VERSION = do { my @r = ( q$Revision: 1.3 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };
# I owe the below codes totally to
# Jcode by Dan Kogai & http://www.din.or.jp/~ohzaki/perl.htm#JP_Base64
sub encode {
my $self = shift;
my $str = shift;
utf8::encode($str) if ( Encode::is_utf8($str) );
Encode::from_to( $str, 'utf8', 'euc-jp' );
my ($trailing_crlf) = ( $str =~ /(\n|\r|\x0d\x0a)$/o );
$str = _mime_unstructured_header( $str, $self->{bpl} );
not $trailing_crlf and $str =~ s/(\n|\r|\x0d\x0a)$//o;
return $str;
}
sub _mime_unstructured_header {
my ( $oldheader, $bpl ) = @_;
my $crlf = $oldheader =~ /\n$/;
my ( $header, @words, @wordstmp, $i ) = ('');
$oldheader =~ s/\s+$//;
@wordstmp = split /\s+/, $oldheader;
for ( $i = 0 ; $i < $#wordstmp ; $i++ ) {
if ( $wordstmp[$i] !~ /^[\x21-\x7E]+$/
and $wordstmp[ $i + 1 ] !~ /^[\x21-\x7E]+$/ )
{
$wordstmp[ $i + 1 ] = "$wordstmp[$i] $wordstmp[$i + 1]";
}
else {
push( @words, $wordstmp[$i] );
}
}
push( @words, $wordstmp[-1] );
for my $word (@words) {
if ( $word =~ /^[\x21-\x7E]+$/ ) {
$header =~ /(?:.*\n)*(.*)/;
if ( length($1) + length($word) > $bpl ) {
$header .= "\n $word";
}
else {
$header .= $word;
}
}
else {
$header = _add_encoded_word( $word, $header, $bpl );
}
$header =~ /(?:.*\n)*(.*)/;
if ( length($1) == $bpl ) {
$header .= "\n ";
}
else {
$header .= ' ';
}
}
$header =~ s/\n? $//mg;
$crlf ? "$header\n" : $header;
}
sub _add_encoded_word {
my ( $str, $line, $bpl ) = @_;
my $result = '';
while ( length($str) ) {
my $target = $str;
$str = '';
if (
length($line) + 22 +
( $target =~ /^(?:$RE{EUC_0212}|$RE{EUC_C})/o ) * 8 > $bpl )
{
$line =~ s/[ \t\n\r]*$/\n/;
$result .= $line;
$line = ' ';
}
while (1) {
my $iso_2022_jp = $target;
Encode::from_to( $iso_2022_jp, 'euc-jp', 'iso-2022-jp' );
my $encoded =
HEAD . MIME::Base64::encode_base64( $iso_2022_jp, '' ) . TAIL;
if ( length($encoded) + length($line) > $bpl ) {
$target =~
s/($RE{EUC_0212}|$RE{EUC_KANA}|$RE{EUC_C}|$RE{ASCII})$//o;
$str = $1 . $str;
}
else {
$line .= $encoded;
last;
}
}
}
$result . $line;
}
1;
__END__
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