From ce0e5d384d892beb80c39c47e7a91fc894e825a2 Mon Sep 17 00:00:00 2001
From: Daniel Becker <razzfazz@gmail.com>
Date: Sun, 8 Feb 2015 22:26:26 -0800
Subject: [PATCH] fix Net_IPv6::compress() to properly handle all-zeros address

The existing implementation of Net_IPv6::compress produces an empty
string when compressing the all-zeros ("::") address; fix this by
checking for empty return values and replacing them with "::".
---
 etc/inc/IPv6.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/etc/inc/IPv6.inc b/etc/inc/IPv6.inc
index e4f86bd3f8..519cbcd09e 100644
--- a/etc/inc/IPv6.inc
+++ b/etc/inc/IPv6.inc
@@ -748,6 +748,12 @@ class Net_IPv6
         $cip = preg_replace('/((^:)|(:$))/', '', $cip);
         $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
 
+        if (empty($cip)) {
+
+            $cip = "::";
+
+        }
+
         if ('' != $netmask) {
 
             $cip = $cip.'/'.$netmask;