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Diffstat (limited to 'Master/tlpkg/tlperl.old/lib/Encode/Unicode/UTF7.pm')
| -rw-r--r-- | Master/tlpkg/tlperl.old/lib/Encode/Unicode/UTF7.pm | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl.old/lib/Encode/Unicode/UTF7.pm b/Master/tlpkg/tlperl.old/lib/Encode/Unicode/UTF7.pm new file mode 100644 index 00000000000..dc75ce37816 --- /dev/null +++ b/Master/tlpkg/tlperl.old/lib/Encode/Unicode/UTF7.pm @@ -0,0 +1,118 @@ +# +# $Id: UTF7.pm,v 2.1 2004/05/25 16:27:14 dankogai Exp $ +# +package Encode::Unicode::UTF7; +use strict; +no warnings 'redefine'; +use base qw(Encode::Encoding); +__PACKAGE__->Define('UTF-7'); +our $VERSION = do { my @r = (q$Revision: 2.1 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; +use MIME::Base64; +use Encode; + +# +# Algorithms taken from Unicode::String by Gisle Aas +# + +our $OPTIONAL_DIRECT_CHARS = 1; +my $specials = quotemeta "\'(),-./:?"; +$OPTIONAL_DIRECT_CHARS and + $specials .= quotemeta "!\"#$%&*;<=>@[]^_`{|}"; +# \s will not work because it matches U+3000 DEOGRAPHIC SPACE +# We use qr/[\n\r\t\ ] instead +my $re_asis = qr/(?:[\n\r\t\ A-Za-z0-9$specials])/; +my $re_encoded = qr/(?:[^\n\r\t\ A-Za-z0-9$specials])/; +my $e_utf16 = find_encoding("UTF-16BE"); + +sub needs_lines { 1 }; + +sub encode($$;$){ + my ($obj, $str, $chk) = @_; + my $len = length($str); + pos($str) = 0; + my $bytes = ''; + while (pos($str) < $len){ + if ($str =~ /\G($re_asis+)/ogc){ + $bytes .= $1; + }elsif($str =~ /\G($re_encoded+)/ogsc){ + if ($1 eq "+"){ + $bytes .= "+-"; + }else{ + my $s = $1; + my $base64 = encode_base64($e_utf16->encode($s), ''); + $base64 =~ s/=+$//; + $bytes .= "+$base64-"; + } + }else{ + die "This should not happen! (pos=" . pos($str) . ")"; + } + } + $_[1] = '' if $chk; + return $bytes; +} + +sub decode{ + my ($obj, $bytes, $chk) = @_; + my $len = length($bytes); + my $str = ""; + while (pos($bytes) < $len) { + if ($bytes =~ /\G([^+]+)/ogc) { + $str .= $1; + }elsif($bytes =~ /\G\+-/ogc) { + $str .= "+"; + }elsif($bytes =~ /\G\+([A-Za-z0-9+\/]+)-?/ogsc) { + my $base64 = $1; + my $pad = length($base64) % 4; + $base64 .= "=" x (4 - $pad) if $pad; + $str .= $e_utf16->decode(decode_base64($base64)); + }elsif($bytes =~ /\G\+/ogc) { + $^W and warn "Bad UTF7 data escape"; + $str .= "+"; + }else{ + die "This should not happen " . pos($bytes); + } + } + $_[1] = '' if $chk; + return $str; +} +1; +__END__ + +=head1 NAME + +Encode::Unicode::UTF7 -- UTF-7 encoding + +=head1 SYNOPSIS + + use Encode qw/encode decode/; + $utf7 = encode("UTF-7", $utf8); + $utf8 = decode("UTF-7", $ucs2); + +=head1 ABSTRACT + +This module implements UTF-7 encoding documented in RFC 2152. UTF-7, +as its name suggests, is a 7-bit re-encoded version of UTF-16BE. It +is designed to be MTA-safe and expected to be a standard way to +exchange Unicoded mails via mails. But with the advent of UTF-8 and +8-bit compliant MTAs, UTF-7 is hardly ever used. + +UTF-7 was not supported by Encode until version 1.95 because of that. +But Unicode::String, a module by Gisle Aas which adds Unicode supports +to non-utf8-savvy perl did support UTF-7, the UTF-7 support was added +so Encode can supersede Unicode::String 100%. + +=head1 In Practice + +When you want to encode Unicode for mails and web pages, however, do +not use UTF-7 unless you are sure your recipients and readers can +handle it. Very few MUAs and WWW Browsers support these days (only +Mozilla seems to support one). For general cases, use UTF-8 for +message body and MIME-Header for header instead. + +=head1 SEE ALSO + +L<Encode>, L<Encode::Unicode>, L<Unicode::String> + +RFC 2781 L<http://www.ietf.org/rfc/rfc2152.txt> + +=cut |