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/*
* Copyright 2021 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.buffer.Unpooled;
import io.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.session.DeviceSession;
import org.traccar.NetworkMessage;
import org.traccar.Protocol;
import org.traccar.helper.BitUtil;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class DualcamProtocolDecoder extends BaseProtocolDecoder {
public DualcamProtocolDecoder(Protocol protocol) {
super(protocol);
}
public static final int MSG_INIT = 0;
public static final int MSG_START = 1;
public static final int MSG_RESUME = 2;
public static final int MSG_SYNC = 3;
public static final int MSG_DATA = 4;
public static final int MSG_COMPLETE = 5;
public static final int MSG_FILE_REQUEST = 8;
public static final int MSG_INIT_REQUEST = 9;
private String uniqueId;
private int packetCount;
private int currentPacket;
private ByteBuf photo;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ByteBuf buf = (ByteBuf) msg;
int type = buf.readUnsignedShort();
switch (type) {
case MSG_INIT:
buf.readUnsignedShort(); // protocol id
uniqueId = String.valueOf(buf.readLong());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
long settings = buf.readUnsignedInt();
if (channel != null && deviceSession != null) {
ByteBuf response = Unpooled.buffer();
if (BitUtil.between(settings, 26, 28) > 0) {
response.writeShort(MSG_FILE_REQUEST);
String file = BitUtil.check(settings, 26) ? "%photof" : "%photor";
response.writeShort(file.length());
response.writeCharSequence(file, StandardCharsets.US_ASCII);
} else {
response.writeShort(MSG_COMPLETE);
}
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_START:
buf.readUnsignedShort(); // length
packetCount = buf.readInt();
currentPacket = 1;
photo = Unpooled.buffer();
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_RESUME);
response.writeShort(4);
response.writeInt(currentPacket);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
break;
case MSG_DATA:
buf.readUnsignedShort(); // length
photo.writeBytes(buf, buf.readableBytes() - 2);
if (currentPacket == packetCount) {
deviceSession = getDeviceSession(channel, remoteAddress);
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
getLastLocation(position, null);
try {
position.set(Position.KEY_IMAGE, writeMediaFile(uniqueId, photo, "jpg"));
} finally {
photo.release();
photo = null;
}
if (channel != null) {
ByteBuf response = Unpooled.buffer();
response.writeShort(MSG_INIT_REQUEST);
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return position;
} else {
currentPacket += 1;
}
break;
default:
break;
}
return null;
}
}
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