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/*
* Copyright 2016 Anton Tananaev (anton.tananaev@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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
public class HuaShengProtocolDecoder extends BaseProtocolDecoder {
public HuaShengProtocolDecoder(HuaShengProtocol protocol) {
super(protocol);
}
public static final int MSG_POSITION = 0xAA00;
public static final int MSG_POSITION_RSP = 0xFF01;
public static final int MSG_LOGIN = 0xAA02;
public static final int MSG_LOGIN_RSP = 0xFF03;
private static void sendResponse(Channel channel, int type, ChannelBuffer content) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.dynamicBuffer();
response.writeByte(0xC0);
response.writeShort(0x0100);
response.writeShort(12 + content.readableBytes());
response.writeShort(type);
response.writeShort(0);
response.writeInt(1);
response.writeBytes(content);
response.writeByte(0xC0);
channel.write(response);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(1); // start marker
buf.readUnsignedByte(); // flag
buf.readUnsignedByte(); // reserved
buf.readUnsignedShort(); // length
int type = buf.readUnsignedShort();
buf.readUnsignedShort(); // checksum
int index = buf.readInt();
if (type == MSG_LOGIN) {
while (buf.readableBytes() > 4) {
int subtype = buf.readUnsignedShort();
int length = buf.readUnsignedShort() - 4;
if (subtype == 0x0003) {
String imei = buf.readBytes(length).toString(StandardCharsets.US_ASCII);
if (identify(imei, channel, remoteAddress) && channel != null) {
ChannelBuffer content = ChannelBuffers.dynamicBuffer();
content.writeByte(0); // success
sendResponse(channel, MSG_LOGIN_RSP, content);
}
} else {
buf.skipBytes(length);
}
}
} else if (type == MSG_POSITION) {
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
position.set(Position.KEY_STATUS, buf.readUnsignedShort());
position.set(Position.KEY_EVENT, buf.readUnsignedShort());
String time = buf.readBytes(12).toString(StandardCharsets.US_ASCII);
DateBuilder dateBuilder = new DateBuilder()
.setYear(Integer.parseInt(time.substring(0, 2)))
.setMonth(Integer.parseInt(time.substring(2, 4)))
.setDay(Integer.parseInt(time.substring(4, 6)))
.setHour(Integer.parseInt(time.substring(6, 8)))
.setMinute(Integer.parseInt(time.substring(8, 10)))
.setSecond(Integer.parseInt(time.substring(10, 12)));
position.setTime(dateBuilder.getDate());
position.setLongitude(buf.readInt() * 0.00001);
position.setLatitude(buf.readInt() * 0.00001);
position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedShort()));
position.setCourse(buf.readUnsignedShort());
position.setAltitude(buf.readUnsignedShort());
position.set(Position.KEY_ODOMETER, buf.readUnsignedShort());
while (buf.readableBytes() > 4) {
buf.readUnsignedShort(); // subtype
int length = buf.readUnsignedShort() - 4;
buf.skipBytes(length);
}
ChannelBuffer content = ChannelBuffers.dynamicBuffer();
content.writeInt(index);
sendResponse(channel, MSG_POSITION_RSP, content);
return position;
}
return null;
}
}
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