From 5601fb8fcf82e6f06c8961ef6bebcc7e9fb0cd07 Mon Sep 17 00:00:00 2001
From: Ken'ichi Fukamachi <fukachan@fml.org>
Date: Tue, 4 Sep 2018 18:15:24 +0900
Subject: add Mail::Message::Encode::Perl for Perl (character-oriented) based
 encoding.

---
 fml/lib/Mail/Message/Encode/Perl.pm | 158 ++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 fml/lib/Mail/Message/Encode/Perl.pm

diff --git a/fml/lib/Mail/Message/Encode/Perl.pm b/fml/lib/Mail/Message/Encode/Perl.pm
new file mode 100644
index 00000000..6d5e76f2
--- /dev/null
+++ b/fml/lib/Mail/Message/Encode/Perl.pm
@@ -0,0 +1,158 @@
+#-*- perl -*-
+#
+#  Copyright (C) 2018 Ken'ichi Fukamachi
+#   All rights reserved. This program is free software; you can
+#   redistribute it and/or modify it under the same terms as Perl itself.
+#
+# $FML$
+#
+
+package Mail::Message::Encode::Perl;
+use strict;
+use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
+use Carp;
+use Encode;
+use Encode::MIME::Header;
+
+=head1 NAME
+
+Mail::Message::Encode::Perl - Perl (character-oriented) based Encoding
+
+=head1 SYNOPSIS
+
+    use Mail::Message::Encode::Perl;
+    my $obj = new Mail::Message::Encode::Perl;
+
+    my $pif_str = $obj->mime_header_decode($str);
+    # ("[BSG:75] Re: Exodus Part II", "UTF-8", "base64")
+
+    # ... several works ... 
+    $pif_str  =~ s/Re: //;
+    Mail::Message::Subject->rewrite_XXX($pif_str);
+
+    $mime_str = $obj->mime_header_encode($pif_str);
+    print $mime_str;
+
+=head1 DESCRIPTION
+
+=head1 METHODS
+
+=head2 new()
+
+constructor.
+
+=cut
+
+
+# Descriptions: constructor.
+#    Arguments: OBJ($self) HASH_REF($args)
+# Side Effects: load Encode or Jcode.
+# Return Value: OBJ
+sub new
+{
+    my ($self, $args) = @_;
+    my ($type) = ref($self) || $self;
+    my $me     = {};
+    return bless $me, $type;
+}
+
+
+=head2 guess_encoding($str)
+
+speculate the encoding of $str string. $str is checked by
+Unicode::Japanese. Unicode::Japanes::getcode() can detect the following
+code: jis, sjis, euc, utf8, ucs2, ucs4, utf16, utf16-ge, utf16-le,
+utf32, utf32-ge, utf32-le, ascii, binary, sjis-imode, sjis-doti,
+sjis-jsky.
+
+C<CAUTION>: Hmm, we suppose we handle only Japanese and English here...
+
+=cut
+
+
+# Descriptions: speculate code of $str string.
+#    Arguments: OBJ($self) STR($str)
+# Side Effects: none
+# Return Value: STR
+sub guess_encoding
+{
+    my ($self, $str) = @_;
+
+    use Unicode::Japanese;
+    my $obj = new Unicode::Japanese;
+    return $obj->getcode($str);
+}
+
+
+=head2 mime_header_enecode($str)
+
+encode the given Perl internal format string to the mime header one.
+
+=head2 mime_header_decode($str)
+
+decode the given mime header format string to the Perl internal one.
+
+=head3 CAUTION
+
+In the current Perl (for backward compatibility), 
+we need to handle the string this way.
+
+   IN -> decode() -> Perl Internal UTF8 format -> encode() -> OUT
+
+=cut
+
+# Descriptions: encode the Perl internal format string to the mime header one.
+#    Arguments: OBJ($self) STR($str)
+# Side Effects: none
+# Return Value: STR
+sub mime_header_encode
+{
+    my ($self, $str) = @_;
+    my $m;
+
+    # XXX how we specify the encoding ?
+    if (1) { # base64 by default
+        $m = encode("MIME-Header", $str, Encode::FB_WARN);
+    }
+    else {
+        $m = encode("MIME-Q", $str, Encode::FB_WARN);
+    }
+    return $m;
+}
+
+# Descriptions: decode mime header format string to the Perl internal one.
+#    Arguments: OBJ($self) STR($hdr)
+# Side Effects: none
+# Return Value: STR(perl internal UTF8 format)
+sub mime_header_decode
+{
+    my ($self, $hdr) = @_;
+
+    decode("MIME-Header", $hdr);
+}
+
+
+=head1 CODING STYLE
+
+See C<http://www.fml.org/software/FNF/> on fml coding style guide.
+
+=head1 AUTHOR
+
+Ken'ichi Fukamachi
+
+=head1 COPYRIGHT
+
+Copyright (C) 2018 Ken'ichi Fukamachi
+
+All rights reserved. This program is free software; you can
+redistribute it and/or modify it under the same terms as Perl itself.
+
+=head1 HISTORY
+
+Mail::Message::Encode first appeared in fml8 mailing list driver package.
+See C<http://www.fml.org/> for more details.
+
+=cut
+
+
+1;
-- 
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