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/*
* Copyright 2013 - 2019 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 CellocatorFrameDecoder extends BaseFrameDecoder {
private static final int MESSAGE_MINIMUM_LENGTH = 15;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
return null;
}
int length = 0;
int type = buf.getUnsignedByte(4);
switch (type) {
case CellocatorProtocolDecoder.MSG_CLIENT_STATUS:
length = 70;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_PROGRAMMING:
length = 31;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL_LOG:
length = 70;
break;
case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL:
if (buf.readableBytes() >= 19) {
length = 19 + buf.getUnsignedShortLE(buf.readerIndex() + 16);
}
break;
case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR:
length = 15 + buf.getUnsignedByte(buf.readerIndex() + 13);
break;
case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR_EXT:
length = 16 + buf.getUnsignedShortLE(buf.readerIndex() + 13);
break;
default:
break;
}
if (length > 0 && buf.readableBytes() >= length) {
return buf.readRetainedSlice(length);
}
return null;
}
}
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