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/*
* Copyright 2021 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.Channel;
import io.netty.channel.ChannelHandlerContext;
import org.traccar.BaseFrameDecoder;
public class JsonFrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
int startIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '{');
if (startIndex >= 0) {
buf.readerIndex(startIndex);
int currentIndex = startIndex + 1;
int nesting = 1;
while (currentIndex < buf.writerIndex() && nesting > 0) {
byte currentByte = buf.getByte(currentIndex);
if (currentByte == '{') {
nesting += 1;
} else if (currentByte == '}') {
nesting -= 1;
}
currentIndex += 1;
}
if (nesting == 0) {
return buf.readRetainedSlice(currentIndex - startIndex);
}
}
return null;
}
}
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