1 files changed, 141 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/GatorProtocolDecoder.java b/src/org/traccar/protocol/GatorProtocolDecoder.java
new file mode 100644
index 000000000..9fa50cc88
--- /dev/null
+++ b/src/org/traccar/protocol/GatorProtocolDecoder.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2013 Anton Tananaev (anton.tananaev@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 java.util.Calendar;
+import java.util.TimeZone;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.ServerManager;
+import org.traccar.helper.ChannelBufferTools;
+import org.traccar.helper.Log;
+import org.traccar.model.ExtendedInfoFormatter;
+import org.traccar.model.Position;
+
+public class GatorProtocolDecoder extends BaseProtocolDecoder {
+
+    public GatorProtocolDecoder(ServerManager serverManager) {
+        super(serverManager);
+    }
+
+    private static final int PACKET_HEARTBEAT = 0x21;
+    private static final int PACKET_POSITION_DATA = 0x80;
+    private static final int PACKET_ROLLCALL_RESPONSE = 0x81;
+    private static final int PACKET_ALARM_DATA = 0x82;
+    private static final int PACKET_TERMINAL_STATUS = 0x83;
+    private static final int PACKET_MESSAGE = 0x84;
+    private static final int PACKET_TERMINAL_ANSWER = 0x85;
+    private static final int PACKET_BLIND_AREA = 0x8E;
+    private static final int PACKET_PICTURE_FRAME = 0x54;
+    private static final int PACKET_CAMERA_RESPONSE = 0x56;
+    private static final int PACKET_PICTURE_DATA = 0x57;
+    
+    private double readCoordinate(ChannelBuffer buf) {
+        int b1 = buf.readUnsignedByte();
+        int b2 = buf.readUnsignedByte();
+        int b3 = buf.readUnsignedByte();
+        int b4 = buf.readUnsignedByte();
+        
+        double value = (b2 & 0xf) * 10 + (b3 >> 4);
+        value += (((b3 & 0xf) * 10 + (b4 >> 4)) * 10 + (b4 & 0xf)) / 1000.0;
+        value /= 60;
+        value += ((b1 >> 4 & 0x7) * 10 + (b1 & 0xf)) * 10 + (b2 >> 4);
+        
+        if ((b1 & 0x80) != 0) {
+            value = -value;
+        }
+        
+        return value;
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, Object msg)
+            throws Exception {
+        
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        buf.skipBytes(2); // header
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedShort(); // length
+
+        // Pseudo IP address
+        String id = String.valueOf(buf.readUnsignedInt());
+        
+        if (type == PACKET_POSITION_DATA ||
+            type == PACKET_ROLLCALL_RESPONSE ||
+            type == PACKET_ALARM_DATA ||
+            type == PACKET_BLIND_AREA) {
+            
+            // Create new position
+            Position position = new Position();
+            ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter("gator");
+
+            // Identification
+            try {
+                position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
+            } catch(Exception error) {
+                Log.warning("Unknown device - " + id);
+            }
+            
+            // Date and time
+            Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+            time.clear();
+            time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
+            time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
+            time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
+            time.set(Calendar.HOUR, ChannelBufferTools.readHexInteger(buf, 2));
+            time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
+            time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
+            position.setTime(time.getTime());
+
+            // Location
+            position.setLatitude(readCoordinate(buf));
+            position.setLongitude(readCoordinate(buf));
+            position.setSpeed(ChannelBufferTools.readHexInteger(buf, 4) * 0.539957);
+            position.setCourse((double) ChannelBufferTools.readHexInteger(buf, 4));
+            position.setAltitude(0.0);
+
+            // Flags
+            int flags = buf.readUnsignedByte();
+            position.setValid((flags & 0x80) != 0);
+            extendedInfo.set("satellites", flags & 0x0f);
+
+            // Status
+            extendedInfo.set("status", buf.readUnsignedByte());
+
+            // Key switch
+            extendedInfo.set("key", buf.readUnsignedByte());
+
+            // Oil
+            extendedInfo.set("oil", buf.readUnsignedShort() / 10.0);
+
+            // Power
+            position.setPower(buf.readUnsignedByte() + buf.readUnsignedByte() / 100.0);
+
+            // Milage
+            extendedInfo.set("milage", buf.readUnsignedInt());
+
+            position.setExtendedInfo(extendedInfo.toString());
+            return position;
+        }
+
+        return null;
+    }
+
+}