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/*
* Copyright 2023 Hossain Mohammad Seym (seym45@gmail.com)
*
* 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 org.traccar.BaseProtocolEncoder;
import org.traccar.Protocol;
import org.traccar.helper.Checksum;
import org.traccar.model.Command;
import java.util.ArrayList;
import java.util.List;
public class GatorProtocolEncoder extends BaseProtocolEncoder {
public GatorProtocolEncoder(Protocol protocol) {
super(protocol);
}
public static ByteBuf encodeId(long deviceId) {
ByteBuf buf = Unpooled.buffer();
String deviceIdStrVal = String.valueOf(deviceId);
List<String> partialDigits = new ArrayList<>();
for (int i = 1; i < deviceIdStrVal.length(); i += 2) {
partialDigits.add(deviceIdStrVal.substring(i, i + 2));
}
int firstDigit = Integer.parseInt(partialDigits.get(0)) - 30;
for (int i = 1; i < partialDigits.size(); i++) {
int shiftCount = 4 - i;
int addend = ((firstDigit & (1 << shiftCount)) >> shiftCount) << 7;
int sum = Integer.parseInt(partialDigits.get(i)) | addend;
buf.writeByte(sum);
}
return buf;
}
private ByteBuf encodeContent(long deviceId, int mainOrder) {
ByteBuf buf = Unpooled.buffer();
buf.writeByte(0x24);
buf.writeByte(0x24);
buf.writeByte(mainOrder);
buf.writeByte(0x00);
buf.writeByte(4 + 1 + 1); // ip 4 bytes, checksum and end byte
ByteBuf pseudoIPAddress = encodeId(deviceId);
buf.writeBytes(pseudoIPAddress);
int checksum = Checksum.xor(buf.nioBuffer());
buf.writeByte(checksum);
buf.writeByte(0x0D);
return buf;
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_POSITION_SINGLE:
return encodeContent(command.getDeviceId(), GatorProtocolDecoder.MSG_POSITION_REQUEST);
default:
return null;
}
}
}
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