Correction based on comments.

Re-write modulo256 checksum's parameter to byte array, not varargs.
Split the tests to two methods for HEADER ver1 and ver2.
Remove above-class copyrights, added top-file copyrights.
Rename parcelNumber to index.
Rename recordStartSign to recordType.
Remove crearing additional buffer for record data, use origin buffer instead.
Added check on minimal length of packet to avoid the out-of-range exceptions.

1 files changed, 18 insertions, 4 deletions

diff --git a/src/org/traccar/protocol/Arnavi4FrameDecoder.java b/src/org/traccar/protocol/Arnavi4FrameDecoder.java
index 97bf75a20..2587420c9 100644
--- a/src/org/traccar/protocol/Arnavi4FrameDecoder.java
+++ b/src/org/traccar/protocol/Arnavi4FrameDecoder.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2017 Ivan Muratov (binakot@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.traccar.protocol;
 
 import org.jboss.netty.buffer.ChannelBuffer;
@@ -5,11 +20,10 @@ import org.jboss.netty.channel.Channel;
 import org.jboss.netty.channel.ChannelHandlerContext;
 import org.jboss.netty.handler.codec.frame.FrameDecoder;
 
-/**
- * Created by Ivan Muratov @binakot on 12.07.2017.
- */
 public class Arnavi4FrameDecoder extends FrameDecoder {
 
+    static final int PACKET_MIN_LENGTH = 4;
+
     static final byte HEADER_START_SIGN = (byte) 0xFF;
     static final byte HEADER_VERSION_1 = 0x22;
     static final byte HEADER_VERSION_2 = 0x23;
@@ -26,7 +40,7 @@ public class Arnavi4FrameDecoder extends FrameDecoder {
             Channel channel,
             ChannelBuffer buf) throws Exception {
 
-        if (buf.readableBytes() == 0) {
+        if (buf.readableBytes() < PACKET_MIN_LENGTH) {
             return null;
         }