JezK
Edit File: ISO_2022_JP.pm
package Encode::MIME::Header::ISO_2022_JP; use strict; use warnings; use parent qw(Encode::MIME::Header); my $obj = bless { decode_b => '1', decode_q => '1', encode => 'B', bpl => 76, Name => 'MIME-Header-ISO_2022_JP' } => __PACKAGE__; Encode::define_encoding($obj, 'MIME-Header-ISO_2022_JP'); use constant HEAD => '=?ISO-2022-JP?B?'; use constant TAIL => '?='; use Encode::CJKConstants qw(%RE); our $VERSION = do { my @r = ( q$Revision: 1.9 $ =~ /\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; return undef unless defined $str; utf8::encode($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__