(function (exports) {
'use strict';

// The host name that represents the supplied UP address
// May be a label, pointer or any combination 

exports.DNS_PACKER_TYPE_PTR = function (ab, dv, total, record) {
  if (!record.data) {
    throw new Error("no data for PTR record");
  }

  var ptrLen = 0;
  var rdLenIndex = total;
  total += 2;

  // RDATA 
  // a sequence of labels
  record.data.split('.').forEach(function (label){
      console.log("the labels are: " + label);
      ptrLen += 1 + label.length;

      dv.setUint8(total, label.length, false);
      total += 1;

      label.split('').forEach(function (ch){
          dv.setUint8(total, ch.charCodeAt(0), false);
          total += 1;
      });
  });

  // RDLENGTH
  dv.setUint16(rdLenIndex, record.data.length + 1, false);

  return total;
};

}('undefined' !== typeof window ? window : exports));