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/*
* Copyright 2014 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;
import org.traccar.CharacterDelimiterFrameDecoder;
import org.traccar.helper.ChannelBufferTools;
public class Stl060FrameDecoder extends CharacterDelimiterFrameDecoder {
public Stl060FrameDecoder(int maxFrameLength) {
super(maxFrameLength, '#');
}
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
ChannelBuffer result = (ChannelBuffer) super.decode(ctx, channel, buf);
if (result != null) {
Integer beginIndex = ChannelBufferTools.find(
result, 0, result.readableBytes(), "$");
if (beginIndex == null) {
return result;
} else {
result.skipBytes(beginIndex);
return result.readBytes(result.readableBytes());
}
}
return null;
}
}
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