sub read_DATA {
    require Socket;
    my ($marker, $marker_tag);
    my $o = shift;
    my ($pkg, $language_id) = @{$o->{API}}{qw(pkg language_id)};
    unless ($DATA_read{$pkg}++) {
        no strict 'refs';
        *Inline::DATA = *{$pkg . '::DATA'};
        local ($/);
         my ($CR, $LF) = (&Socket::CR, &Socket::LF);
        (my $data = <Inline::DATA>) =~ s/$CR?$LF/\n/g;
        @{$DATA{$pkg}} = split /(?m)^[ \t]{0,}(__\S+?__\n)/, $data;
        shift @{$DATA{$pkg}} unless ($ {$DATA{$pkg}}[0] || '') =~ /__\S+?__\n/;
    }
    ($marker, $o->{API}{code}) = splice @{$DATA{$pkg}}, 0, 2;
    croak M08_no_DATA_source_code($language_id)
      unless defined $marker;
    ($marker_tag = $marker) =~ s/__(\S+?)__\n/$1/;
    croak M09_marker_mismatch($marker, $language_id)
      unless $marker_tag eq $language_id;
}