/usr/share/perl5/Email/MIME/Encode.pm is in libemail-mime-perl 1.946-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | use strict;
use warnings;
package Email::MIME::Encode;
# ABSTRACT: a private helper for MIME header encoding
$Email::MIME::Encode::VERSION = '1.946';
use Carp ();
use Encode ();
use MIME::Base64();
use Module::Runtime ();
use Scalar::Util;
our @CARP_NOT;
my %no_mime_headers = map { $_ => undef } qw(date message-id in-reply-to references downgraded-message-id downgraded-in-reply-to downgraded-references);
sub maybe_mime_encode_header {
my ($header, $val, $charset) = @_;
$header = lc $header;
my $header_name_length = length($header) + length(": ");
if (Scalar::Util::blessed($val) && $val->can("as_mime_string")) {
return $val->as_mime_string({
charset => $charset,
header_name_length => $header_name_length,
});
}
return _object_encode($val, $charset, $header_name_length, $Email::MIME::Header::header_to_class_map{$header})
if exists $Email::MIME::Header::header_to_class_map{$header};
my $min_wrap_length = 78 - $header_name_length + 1;
return $val
unless _needs_mime_encode($val) || $val =~ /[^\s]{$min_wrap_length,}/;
return $val
if exists $no_mime_headers{$header};
return mime_encode($val, $charset, $header_name_length);
}
sub _needs_mime_encode {
my ($val) = @_;
return defined $val && $val =~ /(?:\P{ASCII}|=\?|[^\s]{79,}|^\s+|\s+$)/s;
}
sub _needs_mime_encode_addr {
my ($val) = @_;
return _needs_mime_encode($val) || ( defined $val && $val =~ /[:;,]/ );
}
sub _object_encode {
my ($val, $charset, $header_name_length, $class) = @_;
local @CARP_NOT = qw(Email::MIME Email::MIME::Header);
{
local $@;
Carp::croak("Cannot load package '$class': $@") unless eval { Module::Runtime::require_module($class) };
}
Carp::croak("Class '$class' does not have method 'from_string'") unless $class->can('from_string');
my $object = $class->from_string(ref $val eq 'ARRAY' ? @{$val} : $val);
Carp::croak("Object from class '$class' does not have method 'as_mime_string'") unless $object->can('as_mime_string');
return $object->as_mime_string({
charset => $charset,
header_name_length => $header_name_length,
});
}
# XXX this is copied directly out of Courriel::Header
# eventually, this should be extracted out into something that could be shared
sub mime_encode {
my ($text, $charset, $header_name_length) = @_;
$header_name_length = 0 unless defined $header_name_length;
$charset = 'UTF-8' unless defined $charset;
my $enc_obj = Encode::find_encoding($charset);
my $head = '=?' . $enc_obj->mime_name() . '?B?';
my $tail = '?=';
my $mime_length = length($head) + length($tail);
# This code is copied from Mail::Message::Field::Full in the Mail-Box
# distro.
my $real_length = int( ( 75 - $mime_length ) / 4 ) * 3;
my $first_length = int( ( 75 - $header_name_length - $mime_length ) / 4 ) * 3;
my @result;
my $chunk = q{};
my $first_processed = 0;
while ( length( my $chr = substr( $text, 0, 1, '' ) ) ) {
my $chr = $enc_obj->encode( $chr, 0 );
if ( length($chunk) + length($chr) > ( $first_processed ? $real_length : $first_length ) ) {
if ( length($chunk) > 0 ) {
push @result, $head . MIME::Base64::encode_base64( $chunk, q{} ) . $tail;
$chunk = q{};
}
$first_processed = 1
unless $first_processed;
}
$chunk .= $chr;
}
push @result, $head . MIME::Base64::encode_base64( $chunk, q{} ) . $tail
if length $chunk;
return join q{ }, @result;
}
sub maybe_mime_decode_header {
my ($header, $val) = @_;
$header = lc $header;
return _object_decode($val, $Email::MIME::Header::header_to_class_map{$header})
if exists $Email::MIME::Header::header_to_class_map{$header};
return $val
if exists $no_mime_headers{$header};
return $val
unless $val =~ /=\?/;
return mime_decode($val);
}
sub _object_decode {
my ($string, $class) = @_;
local @CARP_NOT = qw(Email::MIME Email::MIME::Header);
{
local $@;
Carp::croak("Cannot load package '$class': $@") unless eval { Module::Runtime::require_module($class) };
}
Carp::croak("Class '$class' does not have method 'from_mime_string'") unless $class->can('from_mime_string');
my $object = $class->from_mime_string($string);
Carp::croak("Object from class '$class' does not have method 'as_string'") unless $object->can('as_string');
return $object->as_string();
}
sub mime_decode {
my ($text) = @_;
return undef unless defined $text;
# The eval is to cope with unknown encodings, like Latin-62, or other
# nonsense that gets put in there by spammers and weirdos
# -- rjbs, 2014-12-04
local $@;
my $result = eval { Encode::decode("MIME-Header", $text) };
return defined $result ? $result : $text;
}
1;
__END__
=pod
=encoding UTF-8
=head1 NAME
Email::MIME::Encode - a private helper for MIME header encoding
=head1 VERSION
version 1.946
=head1 AUTHORS
=over 4
=item *
Ricardo SIGNES <rjbs@cpan.org>
=item *
Casey West <casey@geeknest.com>
=item *
Simon Cozens <simon@cpan.org>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2004 by Simon Cozens and Casey West.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|