protected function makeCentralFileRecord($offset, $ts, $crc, $len, $clen, $name, $comp = null)
    {
        if(is_null($comp)) $comp = $len != $clen;
        $comp = $comp ? 8 : 0;
        $dtime = dechex($this->makeDosTime($ts));

        list($name, $extra) = $this->encodeFilename($name);

        $header = "\x50\x4b\x01\x02"; // central file header signature
        $header .= pack('v', 14); // version made by - VFAT
        $header .= pack('v', 20); // version needed to extract - 2.0
        $header .= pack('v', 0); // general purpose flag - no flags set
        $header .= pack('v', $comp); // compression method - deflate|none
        $header .= pack(
            'H*',
            $dtime[6] . $dtime[7] .
            $dtime[4] . $dtime[5] .
            $dtime[2] . $dtime[3] .
            $dtime[0] . $dtime[1]
        ); //  last mod file time and date
        $header .= pack('V', $crc); // crc-32
        $header .= pack('V', $clen); // compressed size
        $header .= pack('V', $len); // uncompressed size
        $header .= pack('v', strlen($name)); // file name length
        $header .= pack('v', strlen($extra)); // extra field length
        $header .= pack('v', 0); // file comment length
        $header .= pack('v', 0); // disk number start
        $header .= pack('v', 0); // internal file attributes
        $header .= pack('V', 0); // external file attributes  @todo was 0x32!?
        $header .= pack('V', $offset); // relative offset of local header
        $header .= $name; // file name
        $header .= $extra; // extra (utf-8 filename)

        return $header;
    }