From f8cf8aef77e6f3f093178269dd8f145603eeee40 Mon Sep 17 00:00:00 2001
From: tigerbot <seth.gibelyou@daplie.com>
Date: Mon, 22 May 2017 18:22:54 -0600
Subject: [PATCH] added shortening of unpacked string IPv6 addresses

---
 parser/type.aaaa.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/parser/type.aaaa.js b/parser/type.aaaa.js
index 9a05653..e05f20b 100644
--- a/parser/type.aaaa.js
+++ b/parser/type.aaaa.js
@@ -27,6 +27,20 @@ exports.DNS_PARSER_TYPE_AAAA = function (ab, packet, record) {
       s += dv.getUint16(i, false).toString(16);
     }
 
+    // Represent the string address as recommended on the wikipedia page
+    // https://en.wikipedia.org/wiki/IPv6_address#Recommended_representation_as_text.
+    // (shorten the longest section of 0's as long as it's more than one section, replacing
+    // the left-most instance in the event of ties.)
+    var re = /:(0:)+/g;
+    var match;
+    var longest = '_BAD';
+    while (!!(match = re.exec(s))) {
+      if (match[0].length > longest.length) {
+        longest = match[0];
+      }
+    }
+    s = s.replace(longest, '::');
+
     record.address = s;
     return record;
 };