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wakaba |
1.1 |
=head1 NAME
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Encode::Unicode::UTF9 --- Encode/decode of UTF-9
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=head1 ENCODINGS
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=over 4
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=item utf-9
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UTF-9, defined in draft-abela-utf9-00. (Alias: utf9)
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=back
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=cut
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require v5.7.3;
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package Encode::Unicode::UTF9;
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use strict;
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use vars qw($VERSION);
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$VERSION=do{my @r=(q$Revision: 1.2 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r};
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use base qw(Encode::Encoding);
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__PACKAGE__->Define (qw/utf-9 utf9/);
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my %_4to9;
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sub encode ($$;$) {
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my ($obj, $str, $chk) = @_;
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my $r = '';
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for (split //, $str) {
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unless ($_4to9{$_}) {
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my $U = ord $_;
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if ($U <= 0x7F) {
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$_4to9{$_} = $_;
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} else {
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$_4to9{$_} = _ucs4_to_utf9 ($U);
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}
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}
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$r .= $_4to9{$_};
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}
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$_[1] = '' if $chk;
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return $r;
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}
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my %_9to4;
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sub decode ($$;$) {
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my ($obj, $str, $chk) = @_;
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$str =~ s{
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([\x80-\x8F][\x80-\xFF])
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|([\x90-\x93][\x80-\xFF][\x80-\xFF])
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|([\x94-\x97][\x80-\xFF][\x80-\xFF][\x80-\xFF])
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|([\x98-\x9F][\x80-\xFF][\x80-\xFF][\x80-\xFF][\x80-\xFF])
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|([\x80-\xFF])
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}{
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my ($o2,$o3,$o4,$o5,$o1) = ($1,$2,$3,$4,$5);
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unless ($_9to4{$o2.$o3.$o4.$o5.$o1}) {
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if ($o1) {
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$_9to4{$o1} = $o1;
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} elsif ($o2) {
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my @o = split //, $o2;
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$_9to4{$o2} =
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chr (((ord ($o[0]) & 0x7F) << 7) + (ord ($o[1]) & 0x7F));
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} elsif ($o3) {
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my @o = split //, $o3;
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$_9to4{$o3} =
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chr (((ord ($o[0]) & 0x03) << 14) + ((ord ($o[1]) & 0x7F) << 7)
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+ (ord ($o[2]) & 0x7F));
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} elsif ($o4) {
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my @o = split //, $o4;
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$_9to4{$o4} =
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chr (((ord ($o[0]) & 0x03) << 21) + ((ord ($o[1]) & 0x7F) << 14)
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+ ((ord ($o[2]) & 0x7F) << 7) + (ord ($o[3]) & 0x7F));
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} else {
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my @o = split //, $o5;
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$_9to4{$o5} =
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chr (((ord ($o[0]) & 0x07) << 28) + ((ord ($o[1]) & 0x7F) << 21)
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+ ((ord ($o[2]) & 0x7F) << 14) + ((ord ($o[3]) & 0x7F) << 7)
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+ (ord ($o[4]) & 0x7F));
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}
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}
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$_9to4{$o2.$o3.$o4.$o5.$o1};
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}goex;
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$_[1] = '' if $chk;
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return $str;
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}
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sub _ucs4_to_utf9 ($) {
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my $U = shift;
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if ($U <= 0x007F || (0x00A0 <= $U && $U <= 0x00FF)) {
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return pack 'C', $U;
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} elsif ($U <= 0x07FF) {
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return pack 'C2', (0x80 | ($U >> 7)), (0x80 | ($U & 0x7F));
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} elsif ($U <= 0xFFFF) {
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return pack 'C3', (0x90 | ($U >> 14)), (0x80 | (($U >> 7) & 0x7F)),
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(0x80 | ($U & 0x7F));
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} elsif ($U <= 0x7FFFFF) {
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return pack 'C4', (0x94 | ($U >> 21)), (0x80 | (($U >> 14) & 0x7F)),
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(0x80 | (($U >> 7) & 0x7F)), (0x80 | ($U & 0x7F));
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} else {#if ($U <= 0x7FFFFFFF) {
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return pack 'C5', (0x98 | (($U >> 28) & 0x07)),
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(0x80 | (($U >> 21) & 0x7F)), (0x80 | (($U >> 14) & 0x7F)),
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(0x80 | (($U >> 7) & 0x7F)), (0x80 | ($U & 0x7F));
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}
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}
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1;
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=head1 LICENSE
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Copyright 2002 Nanashi-san
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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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=cut
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## $Date: 2002/09/15 04:15:51 $
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### UTF9.pm ends here
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