From 6e70a873886b366980423e448808b60c624e4047 Mon Sep 17 00:00:00 2001
From: Ivan Muratov <binakot@gmail.com>
Date: Thu, 13 Jul 2017 08:30:35 +0300
Subject: Basic ARNAVI4 binary protocol implementation is done. Supported 2
 types of HEADER packets (v1, v2). Supported 3 types of PACKAGE DATA records:
 latitude, longitude and additional data (speed, satellites, altitude,
 course).

---
 src/org/traccar/protocol/Arnavi4FrameDecoder.java | 51 +++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/org/traccar/protocol/Arnavi4FrameDecoder.java

(limited to 'src/org/traccar/protocol/Arnavi4FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Arnavi4FrameDecoder.java b/src/org/traccar/protocol/Arnavi4FrameDecoder.java
new file mode 100644
index 000000000..eaf829cc3
--- /dev/null
+++ b/src/org/traccar/protocol/Arnavi4FrameDecoder.java
@@ -0,0 +1,51 @@
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+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 byte HEADER_START_SIGN = (byte)0xFF;
+    static final byte HEADER_VERSION_1 = 0x22;
+    static final byte HEADER_VERSION_2 = 0x23;
+    static final int HEADER_LENGTH = 10;
+
+    static final byte PACKAGE_START_SIGN = 0x5B;
+    static final byte PACKAGE_END_SIGN = 0x5D;
+    static final int PACKAGE_MIN_PARCEL_NUMBER = 0x01;
+    static final int PACKAGE_MAX_PARCEL_NUMBER = 0xFB;
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() == 0) {
+            return null;
+        }
+
+        byte[] bytes = new byte[buf.readableBytes()];
+        buf.getBytes(0, bytes);
+
+        if (bytes[0] == HEADER_START_SIGN
+                && bytes.length == HEADER_LENGTH
+                && (bytes[1] == HEADER_VERSION_1 || bytes[1] == HEADER_VERSION_2)) {
+            return buf.readBytes(HEADER_LENGTH);
+        }
+
+        int parcelNumber = bytes[1] & 0xFF;
+        if (bytes[0] == PACKAGE_START_SIGN && bytes[bytes.length - 1] == PACKAGE_END_SIGN
+                && parcelNumber >= PACKAGE_MIN_PARCEL_NUMBER && parcelNumber <= PACKAGE_MAX_PARCEL_NUMBER) {
+            return buf.readBytes(bytes.length);
+        }
+
+        return null;
+    }
+
+}
-- 
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