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/*
* Copyright 2014 - 2018 Anton Tananaev (anton@traccar.org)
*
* 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 io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import org.traccar.CharacterDelimiterFrameDecoder;
public class Stl060FrameDecoder extends CharacterDelimiterFrameDecoder {
public Stl060FrameDecoder(int maxFrameLength) {
super(maxFrameLength, '#');
}
@Override
protected Object decode(ChannelHandlerContext ctx, ByteBuf buf) throws Exception {
ByteBuf result = (ByteBuf) super.decode(ctx, buf);
if (result != null) {
int index = result.indexOf(result.readerIndex(), result.writerIndex(), (byte) '$');
if (index == -1) {
return result;
} else {
result.skipBytes(index);
return result.readRetainedSlice(result.readableBytes());
}
}
return null;
}
}
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