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/*
* Copyright 2015 - 2020 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.helper;
import org.traccar.model.Position;
import java.util.AbstractMap;
import java.util.Map;
public final class ObdDecoder {
private ObdDecoder() {
}
private static final int MODE_CURRENT = 0x01;
private static final int MODE_FREEZE_FRAME = 0x02;
private static final int MODE_CODES = 0x03;
public static Map.Entry<String, Object> decode(int mode, String value) {
return switch (mode) {
case MODE_CURRENT, MODE_FREEZE_FRAME -> decodeData(
Integer.parseInt(value.substring(0, 2), 16),
Long.parseLong(value.substring(2), 16), true);
case MODE_CODES -> decodeCodes(value);
default -> null;
};
}
private static Map.Entry<String, Object> createEntry(String key, Object value) {
return new AbstractMap.SimpleEntry<>(key, value);
}
public static Map.Entry<String, Object> decodeCodes(String value) {
StringBuilder codes = new StringBuilder();
for (int i = 0; i < value.length() / 4; i++) {
int numValue = Integer.parseInt(value.substring(i * 4, (i + 1) * 4), 16);
codes.append(' ').append(decodeCode(numValue));
}
if (!codes.isEmpty()) {
return createEntry(Position.KEY_DTCS, codes.toString().trim());
} else {
return null;
}
}
public static String decodeCode(int value) {
char prefix = switch (value >> 14) {
case 1 -> 'C';
case 2 -> 'B';
case 3 -> 'U';
default -> 'P';
};
return String.format("%c%04X", prefix, value & 0x3FFF);
}
public static Map.Entry<String, Object> decodeData(int pid, long value, boolean convert) {
return switch (pid) {
case 0x04 -> createEntry(Position.KEY_ENGINE_LOAD, convert ? value * 100 / 255 : value);
case 0x05 -> createEntry(Position.KEY_COOLANT_TEMP, convert ? value - 40 : value);
case 0x0B -> createEntry("mapIntake", value);
case 0x0C -> createEntry(Position.KEY_RPM, convert ? value / 4 : value);
case 0x0D -> createEntry(Position.KEY_OBD_SPEED, value);
case 0x0F -> createEntry("intakeTemp", convert ? value - 40 : value);
case 0x11 -> createEntry(Position.KEY_THROTTLE, convert ? value * 100 / 255 : value);
case 0x21 -> createEntry("milDistance", value);
case 0x2F -> createEntry(Position.KEY_FUEL_LEVEL, convert ? value * 100 / 255 : value);
case 0x31 -> createEntry("clearedDistance", value);
default -> null;
};
}
}
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