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//usr/lib/perl5/5.8.8/Encode/MIME/Header/ISO_2022_JP.pm

package Encode::MIME::Header::ISO_2022_JP;

use strict;
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: 1.1 $ =~ /\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__