added PTR record packer

packer/type.ns.js

@@ -16,7 +16,6 @@ exports.DNS_PACKER_TYPE_NS = function (ab, dv, total, record) {
 
   // RDATA 
   // a sequence of labels
-
   record.data.split('.').forEach(function(label) {
       nsLen += 1 + label.length;
       

packer/type.ptr.js

@@ -0,0 +1,37 @@
+(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));