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package Razor2::Preproc::enBase64;

sub new {
    return bless {}, shift;
}

sub isit {
    my ( $self, $text ) = @_;
    my $is_binary = ( $$text =~ /^Content-Type-Encoding: 8-bit/ )
      || ( $$text =~ /([\x00-\x1f|\x7f-\xff])/ and $1 !~ /[\r\n\t]/ );

    return $is_binary;
}

sub doit {
    my ( $self, $text ) = @_;

    pos($$text) = 0;    # ensure start at the beginning

    my $res = join '', map( pack( 'u', $_ ) =~ /^.(\S*)/, ( $$text =~ /(.{1,45})/gs ) );

    $res =~ tr|` -_|AA-Za-z0-9+/|;    # `# help emacs
                                      # fix padding at the end
    my $padding = ( 3 - length($$text) % 3 ) % 3;
    $res =~ s/.{$padding}$/'=' x $padding/e if $padding;

    # split into lines
    $res =~ s/(.{1,76})/$1\n/g;

    $res = "Content-Transfer-Encoding: base64\n\n$res";

    $$text = $res;
}

1;