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/*
* 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.nio.charset.Charset;
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.StringFinder;
public class TotemFrameDecoder extends FrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
if (buf.readableBytes() < 10) {
return null;
}
int beginIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("$$"));
if (beginIndex == -1) {
return null;
} else if (beginIndex > buf.readerIndex()) {
buf.readerIndex(beginIndex);
}
int length = Integer.parseInt(buf.toString(buf.readerIndex() + 2, 2, Charset.defaultCharset()), 16);
if (length <= buf.readableBytes()) {
return buf.readBytes(length);
}
return null;
}
}
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