1 files changed, 57 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/RoboTrackFrameDecoder.java b/src/org/traccar/protocol/RoboTrackFrameDecoder.java
new file mode 100644
index 000000000..aecbaaa3b
--- /dev/null
+++ b/src/org/traccar/protocol/RoboTrackFrameDecoder.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2018 Anton Tananaev (anton@traccar.org)
+ *
+ * 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 io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+public class RoboTrackFrameDecoder extends BaseFrameDecoder {
+
+    private int messageLength(ByteBuf buf) {
+        switch ((int) buf.getByte(buf.readerIndex())) {
+            case RoboTrackProtocolDecoder.MSG_ID:
+                return 69;
+            case RoboTrackProtocolDecoder.MSG_ACK:
+                return 3;
+            case RoboTrackProtocolDecoder.MSG_GPS:
+            case RoboTrackProtocolDecoder.MSG_GSM:
+            case RoboTrackProtocolDecoder.MSG_IMAGE_START:
+                return 24;
+            case RoboTrackProtocolDecoder.MSG_IMAGE_DATA:
+                return 8 + buf.getUnsignedShortLE(buf.readerIndex() + 1);
+            case RoboTrackProtocolDecoder.MSG_IMAGE_END:
+                return 6;
+            default:
+                return Integer.MAX_VALUE;
+        }
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        int length = messageLength(buf);
+
+        if (buf.readableBytes() >= length) {
+            return buf.readRetainedSlice(length);
+        }
+
+        return null;
+    }
+
+}