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use strict;
use warnings;
no warnings 'redefine';

our $VERSION = do { my @r = ( q$Revision: 2.13 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };
use Encode qw(find_encoding encode_utf8 decode_utf8);
use MIME::Base64;
use Carp;

my %seed = (
    decode_b => '1',    # decodes 'B' encoding ?
    decode_q => '1',    # decodes 'Q' encoding ?
    encode   => 'B',    # encode with 'B' or 'Q' ?
    bpl      => 75,     # bytes per line
);

$Encode::Encoding{'MIME-Header'} =
  bless { %seed, Name => 'MIME-Header', } => __PACKAGE__;

$Encode::Encoding{'MIME-B'} = bless {
    %seed,
    decode_q => 0,
    Name     => 'MIME-B',
} => __PACKAGE__;

$Encode::Encoding{'MIME-Q'} = bless {
    %seed,
    decode_q => 1,
    encode   => 'Q',
    Name     => 'MIME-Q',
} => __PACKAGE__;

use base qw(Encode::Encoding);

sub needs_lines { 1 }
sub perlio_ok   { 0 }

sub decode($$;$) {
    use utf8;
    my ( $obj, $str, $chk ) = @_;

    # zap spaces between encoded words
    $str =~ s/\?=\s+=\?/\?==\?/gos;

    # multi-line header to single line
    $str =~ s/(?:\r\n|[\r\n])[ \t]//gos;

    1 while ( $str =~
        s/(=\?[-0-9A-Za-z_]+\?[Qq]\?)(.*?)\?=\1(.*?\?=)/$1$2$3/ )
      ;    # Concat consecutive QP encoded mime headers
           # Fixes breaking inside multi-byte characters

    $str =~ s{
        =\?              # begin encoded word
        ([-0-9A-Za-z_]+) # charset (encoding)
        (?:\*[A-Za-z]{1,8}(?:-[A-Za-z]{1,8})*)? # language (RFC 2231)
        \?([QqBb])\?     # delimiter
        (.*?)            # Base64-encodede contents
        \?=              # end encoded word
    }{
        if      (uc($2) eq 'B'){
            $obj->{decode_b} or croak qq(MIME "B" unsupported);
            decode_b($1, $3, $chk);
        } elsif (uc($2) eq 'Q'){
            $obj->{decode_q} or croak qq(MIME "Q" unsupported);
            decode_q($1, $3, $chk);
        } else {
            croak qq(MIME "$2" encoding is nonexistent!);
        }
    }egox;
    $_[1] = $str if $chk;
    return $str;
}

sub decode_b {
    my $enc  = shift;
    my $d    = find_encoding($enc) or croak qq(Unknown encoding "$enc");
    my $db64 = decode_base64(shift);
    my $chk  = shift;
    return $d->name eq 'utf8'
      ? Encode::decode_utf8($db64)
      : $d->decode( $db64, $chk || Encode::FB_PERLQQ );
}

sub decode_q {
    my ( $enc, $q, $chk ) = @_;
    my $d = find_encoding($enc) or croak qq(Unknown encoding "$enc");
    $q =~ s/_/ /go;
    $q =~ s/=([0-9A-Fa-f]{2})/pack("C", hex($1))/ego;
    return $d->name eq 'utf8'
      ? Encode::decode_utf8($q)
      : $d->decode( $q, $chk || Encode::FB_PERLQQ );
}

my $especials =
  join( '|' => map { quotemeta( chr($_) ) }
      unpack( "C*", qq{()<>,;:"'/[]?=} ) );

my $re_encoded_word = qr{
    =\?                # begin encoded word
    (?:[-0-9A-Za-z_]+) # charset (encoding)
    (?:\*[A-Za-z]{1,8}(?:-[A-Za-z]{1,8})*)? # language (RFC 2231)
    \?(?:[QqBb])\?     # delimiter
    (?:.*?)            # Base64-encodede contents
    \?=                # end encoded word
}xo;

my $re_especials = qr{$re_encoded_word|$especials}xo;

sub encode($$;$) {
    my ( $obj, $str, $chk ) = @_;
    my @line = ();
    for my $line ( split /\r\n|[\r\n]/o, $str ) {
        my ( @word, @subline );
        for my $word ( split /($re_especials)/o, $line ) {
            if (   $word =~ /[^\x00-\x7f]/o
                or $word =~ /^$re_encoded_word$/o )
            {
                push @word, $obj->_encode($word);
            }
            else {
                push @word, $word;
            }
        }
        my $subline = '';
        for my $word (@word) {
            use bytes ();
            if ( bytes::length($subline) + bytes::length($word) >
                $obj->{bpl} - 1 )
            {
                push @subline, $subline;
                $subline = '';
            }
            $subline .= ' ' if ($subline =~ /\?=$/ and $word =~ /^=\?/);
            $subline .= $word;
    