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/*
* Copyright 2012 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.text.ParseException;
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;
import org.traccar.helper.ChannelBufferTools;
public class Jt600FrameDecoder extends FrameDecoder {
private static int MESSAGE_LENGTH = 37;
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
// Message identifier
char first = (char) buf.getByte(0);
int length = buf.readableBytes();
if (first == '$') {
// Check length
if (length >= MESSAGE_LENGTH) {
return buf.readBytes(MESSAGE_LENGTH);
}
} else if (first == '(') {
// Find ending
Integer endIndex = ChannelBufferTools.find(buf, 0, length, ")");
if (endIndex != null) {
return buf.readBytes(endIndex + 1);
}
} else {
// Unknown message
throw new ParseException(null, 0);
}
return null;
}
}
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