fix kaitoy#94 - UDP checksum 0xFFFF

michaelkoetter · May 9, 2017 · b9d7ef0 · b9d7ef0
1 parent a346091
commit b9d7ef0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/pcap4j-core/src/main/java/org/pcap4j/packet/UdpPacket.java b/pcap4j-core/src/main/java/org/pcap4j/packet/UdpPacket.java
@@ -509,7 +509,8 @@ private short calcChecksum(
       );
       destPos += SHORT_SIZE_IN_BYTES;
 
-      return ByteArrays.calcChecksum(data);
+      short checksum = ByteArrays.calcChecksum(data);
+      return checksum != 0 ? checksum : (short)0xFFFF;
     }
 
     /**