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Diffstat (limited to 'src/org/traccar/protocol/CellocatorFrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/CellocatorFrameDecoder.java70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/CellocatorFrameDecoder.java b/src/org/traccar/protocol/CellocatorFrameDecoder.java
new file mode 100644
index 000000000..cddb33d52
--- /dev/null
+++ b/src/org/traccar/protocol/CellocatorFrameDecoder.java
@@ -0,0 +1,70 @@
+/*
+ * 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.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class CellocatorFrameDecoder extends FrameDecoder {
+
+ private static final int MESSAGE_MINIMUM_LENGTH = 15;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ // Check minimum length
+ int available = buf.readableBytes();
+ if (available < MESSAGE_MINIMUM_LENGTH) {
+ return null;
+ }
+
+ // Size depending on message type
+ int length = 0;
+ switch (buf.getUnsignedByte(4))
+ {
+ case CellocatorProtocolDecoder.MSG_CLIENT_STATUS:
+ length = 70;
+ break;
+ case CellocatorProtocolDecoder.MSG_CLIENT_PROGRAMMING:
+ length = 31;
+ break;
+ case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL_LOG:
+ length = 70;
+ break;
+ case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL:
+ if (available >= 19) {
+ length = 19 + buf.getUnsignedShort(16);
+ }
+ break;
+ case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR:
+ length = 15 + buf.getUnsignedByte(13);
+ break;
+ }
+
+ // Read packet
+ if (length > 0 && available >= length) {
+ return buf.readBytes(length + 2);
+ }
+
+ return null;
+ }
+
+}