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 "::".

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/inc/IPv6.inc b/etc/inc/IPv6.inc
index e4f86bd..519cbcd 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;