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/*
* Copyright 2017 Valerii Vyshniak (val@val.one)
* Copyright 2017 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 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.FrameDecoder;
import java.nio.ByteOrder;
public class Tk103FrameDecoder extends FrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
if (buf.readableBytes() < 2) {
return null;
}
int index;
for (index = buf.readerIndex(); true; index++) {
index = buf.indexOf(index, buf.writerIndex(), (byte) ')');
if (index == -1) {
break;
}
int cnt = 0;
for (int i = buf.readerIndex(); i < index; i++) {
if (buf.getByte(i) == (byte) '$') {
cnt++;
}
}
if (cnt % 2 == 0) {
break;
}
}
if (index != -1) {
ChannelBuffer result = ChannelBuffers.buffer(ByteOrder.LITTLE_ENDIAN, index + 1 - buf.readerIndex());
buf.readBytes(result, index + 1 - buf.readerIndex());
result.writerIndex(result.writerIndex() - 1);
return result;
}
return null;
}
}
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