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/*
* Copyright 2023 - Hossain Mohammad Seym
*
* 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.config.Keys;
import org.traccar.helper.Checksum;
import org.traccar.helper.DataConverter;
import org.traccar.helper.model.AttributeUtil;
import org.traccar.model.Command;
import org.traccar.model.Device;
import java.nio.charset.StandardCharsets;
public class GatorProtocolEncoder extends BaseProtocolEncoder {
public GatorProtocolEncoder(Protocol protocol) {
super(protocol);
}
public static String encodeId(long deviceId) {
StringBuilder encodedId = new StringBuilder();
String imei = String.valueOf(deviceId);
String a = imei.substring(1, 3);
String b = imei.substring(3, 5);
String c = imei.substring(5, 7);
String d = imei.substring(7, 9);
String e = imei.substring(9);
String[] arr = {b, c, d, e};
String binaryFirstDigit = Integer.toBinaryString(Integer.valueOf(a) - 30);
binaryFirstDigit = String.format("%4s", binaryFirstDigit).replace(' ', '0');
for (int i = 0; i < 4; i++) {
int sum = Integer.parseInt(arr[i]) + Integer.parseInt(String.valueOf(binaryFirstDigit.charAt(i)) + "0000000", 2);
arr[i] = Integer.toHexString(sum).toUpperCase();
arr[i] = String.format("%2s", arr[i]).replace(' ', '0');
}
for (String s : arr) {
encodedId.append(s);
}
return encodedId.toString();
}
private static String getCalibrationByteFromHexString(String data) {
String response = "";
int calib = 0;
int length = data.length() / 2;
for (int i = 0; i < length; i++) {
calib = calib ^ Integer.parseInt(data.substring(i * 2, i * 2 + 2), 16);
}
response = Integer.toHexString(calib).toUpperCase();
response = String.format("%2s", response).replace(' ', '0');
return response;
}
private ByteBuf encodeContent(long deviceId, String mainOrder, String content) {
String pseudoIPAddress = encodeId(deviceId);
int length = 4 + 1 + 1; // ip 4 bytes, calibration byte and end byte
String hexStringLength = String.format("%02X", length);
String packet = "2424" + mainOrder + "00" + hexStringLength + pseudoIPAddress;
String calibration = getCalibrationByteFromHexString(packet);
packet = packet + calibration + "0D";
return Unpooled.wrappedBuffer(DataConverter.parseHex(packet));
}
@Override
protected Object encodeCommand(Command command) {
switch (command.getType()) {
case Command.TYPE_ROLLCALL:
return encodeContent(command.getDeviceId(), "30", null);
default:
return null;
}
}
}
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