From 7c0c98b504caf0463d79785acd7b173fd4846a8e Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 1 Jul 2016 11:08:29 +0100
Subject: [PATCH] Addd loop guard to prevent negative bit shift

---
 src/osgPlugins/zip/unzip.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/osgPlugins/zip/unzip.cpp b/src/osgPlugins/zip/unzip.cpp
index 0d64cc02a..88a30004e 100644
--- a/src/osgPlugins/zip/unzip.cpp
+++ b/src/osgPlugins/zip/unzip.cpp
@@ -2003,7 +2003,7 @@ uInt *v)               // working area: values in order of bit length
 
       // backup over finished tables
       mask = (1 << w) - 1;      // needed on HP, cc -O bug
-      while ((i & mask) != x[h])
+      while (((i & mask) != x[h]) && (w>=l))
       {
         h--;                    // don't need to update q
         w -= l;