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/*
* Copyright 2013 - 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 org.traccar.BaseFrameDecoder;
import org.traccar.NetworkMessage;
import org.traccar.helper.BufferUtil;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
public class WondexFrameDecoder extends BaseFrameDecoder {
private static final int KEEP_ALIVE_LENGTH = 8;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.readableBytes() < KEEP_ALIVE_LENGTH) {
return null;
}
if (buf.getUnsignedByte(buf.readerIndex()) == 0xD0) {
// Send response
ByteBuf frame = buf.readRetainedSlice(KEEP_ALIVE_LENGTH);
if (channel != null) {
frame.retain();
channel.writeAndFlush(new NetworkMessage(frame, channel.remoteAddress()));
}
return frame;
} else {
int index = BufferUtil.indexOf("\r\n", buf);
if (index != -1) {
ByteBuf frame = buf.readRetainedSlice(index - buf.readerIndex());
buf.skipBytes(2);
return frame;
}
}
return null;
}
}
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