commit 921674b3f1585dde76d13f181abcfc6d49bd737d
Author: Rene Treffer <treffer@measite.de>
Date:   Thu Apr 3 10:51:05 2014 +0200

    Fix negative jump targets

diff --git a/src/de/measite/minidns/util/NameUtil.java b/src/de/measite/minidns/util/NameUtil.java
index a7edc22ad..91a6649d8 100644
--- a/src/de/measite/minidns/util/NameUtil.java
+++ b/src/de/measite/minidns/util/NameUtil.java
@@ -70,7 +70,7 @@ public class NameUtil {
     ) {
         int c = data[offset] & 0xff;
         if ((c & 0xc0) == 0xc0) {
-            c = ((c & 0x3f) << 8) + data[offset + 1];
+            c = ((c & 0x3f) << 8) + (data[offset + 1] & 0xff);
             if (jumps.contains(c)) {
                 throw new IllegalStateException("Cyclic offsets detected.");
             }