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-rw-r--r--src/org/traccar/protocol/IntellitracFrameDecoder.java58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/IntellitracFrameDecoder.java b/src/org/traccar/protocol/IntellitracFrameDecoder.java
new file mode 100644
index 000000000..461186310
--- /dev/null
+++ b/src/org/traccar/protocol/IntellitracFrameDecoder.java
@@ -0,0 +1,58 @@
+/*
+ * 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.DelimiterBasedFrameDecoder;
+
+public class IntellitracFrameDecoder extends DelimiterBasedFrameDecoder {
+
+ private static final int MESSAGE_MINIMUM_LENGTH = 0;
+
+ private static final byte delimiter[] = { (byte) '\r', (byte) '\n' };
+
+ public IntellitracFrameDecoder(int maxFrameLength) {
+ super(maxFrameLength, ChannelBuffers.wrappedBuffer(delimiter));
+ }
+
+ // example of sync header: 0xFA 0xF8 0x1B 0x01 0x81 0x60 0x33 0x3C
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ // Check minimum length
+ if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
+ return null;
+ }
+
+ // Check for sync packet
+ if (buf.getUnsignedShort(buf.readerIndex()) == 0xFAF8) {
+ ChannelBuffer syncMessage = buf.readBytes(8);
+ if (channel != null) {
+ channel.write(syncMessage);
+ }
+ }
+
+ return super.decode(ctx, channel, buf);
+ }
+
+}