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/*
* Copyright 2017 - 2023 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.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import org.traccar.BaseFrameDecoder;
public class WatchFrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
int brackets = 0;
int endIndex = -1;
for (int i = buf.readerIndex(); i < buf.writerIndex(); i++) {
byte b = buf.getByte(i);
switch (b) {
case '[':
brackets += 1;
break;
case ']':
brackets -= 1;
break;
default:
break;
}
if (brackets == 0 && i > buf.readerIndex()) {
endIndex = i + 1;
break;
}
}
if (endIndex > 0) {
ByteBuf frame = Unpooled.buffer();
while (buf.readerIndex() < endIndex) {
byte b1 = buf.readByte();
if (b1 == '}') {
byte b2 = buf.readByte();
switch (b2) {
case 0x01:
frame.writeByte('}');
break;
case 0x02:
frame.writeByte('[');
break;
case 0x03:
frame.writeByte(']');
break;
case 0x04:
frame.writeByte(',');
break;
case 0x05:
frame.writeByte('*');
break;
default:
throw new IllegalArgumentException(String.format(
"unexpected byte at %d: 0x%02x", buf.readerIndex() - 1, b2));
}
} else {
frame.writeByte(b1);
}
}
return frame;
}
return null;
}
}
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