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/*
* Copyright 2017 Ivan Muratov (binakot@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.DeviceSession;
import org.traccar.helper.Checksum;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_START_SIGN;
import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_VERSION_1;
import static org.traccar.protocol.Arnavi4FrameDecoder.HEADER_VERSION_2;
public class Arnavi4ProtocolDecoder extends BaseProtocolDecoder {
private static final byte RECORD_PING = 0x00;
private static final byte RECORD_DATA = 0x01;
private static final byte RECORD_TEXT = 0x03;
private static final byte RECORD_FILE = 0x04;
private static final byte RECORD_BINARY = 0x06;
private static final byte TAG_LATITUDE = 3;
private static final byte TAG_LONGITUDE = 4;
private static final byte TAG_COORD_PARAMS = 5;
public Arnavi4ProtocolDecoder(Arnavi4Protocol protocol) {
super(protocol);
}
private void sendHeaderResponse(Channel channel, byte version) {
if (channel != null) {
final ChannelBuffer response;
if (version == HEADER_VERSION_1) {
response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
response.writeBytes(new byte[]{0x7B, 0x00, 0x00, 0x7D});
} else if (version == HEADER_VERSION_2) {
response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 9);
response.writeBytes(new byte[]{0x7B, 0x04, 0x00});
byte[] timeBytes = ByteBuffer.allocate(4).putInt((int) (System.currentTimeMillis() / 1000)).array();
response.writeByte(Checksum.modulo256(timeBytes));
response.writeBytes(timeBytes);
response.writeByte(0x7D);
} else {
return; // Ignore unsupported versions of header
}
channel.write(response);
}
}
private void sendPackageResponse(Channel channel, int index) {
if (channel != null) {
final ChannelBuffer response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4);
response.writeBytes(new byte[]{0x7B, 0x00, (byte) index, 0x7D});
channel.write(response);
}
}
private Position decodePosition(DeviceSession deviceSession, ChannelBuffer buf, int length, Date time) {
final Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setTime(time);
int readBytes = 0;
while (readBytes < length) {
short tag = buf.readUnsignedByte();
switch (tag) {
case TAG_LATITUDE:
position.setLatitude(buf.readFloat());
position.setValid(true);
break;
case TAG_LONGITUDE:
position.setLongitude(buf.readFloat());
position.setValid(true);
break;
case TAG_COORD_PARAMS:
position.setCourse(buf.readUnsignedByte() * 2);
position.setAltitude(buf.readUnsignedByte() * 10);
byte satellites = buf.readByte();
position.set(Position.KEY_SATELLITES, satellites & 0x0F + (satellites >> 4) & 0x0F); // gps+glonass
position.setSpeed(buf.readUnsignedByte());
break;
default:
buf.readBytes(4); // Skip unsupported tags
break;
}
readBytes += 5; // 1 byte tag + 4 bytes value
}
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
byte startSign = buf.readByte();
if (startSign == HEADER_START_SIGN) {
byte version = buf.readByte();
String imei = String.valueOf(buf.readLong());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
if (deviceSession != null) {
sendHeaderResponse(channel, version);
}
return null;
}
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
List<Position> positions = new LinkedList<>();
int index = buf.readUnsignedByte();
byte recordType = buf.readByte();
while (buf.readableBytes() > 0) {
switch (recordType) {
case RECORD_PING:
case RECORD_DATA:
case RECORD_TEXT:
case RECORD_FILE:
case RECORD_BINARY:
int length = buf.readUnsignedShort();
Date time = new Date(buf.readUnsignedInt() * 1000);
if (recordType == RECORD_DATA) {
positions.add(decodePosition(deviceSession, buf, length, time));
} else {
buf.readBytes(length); // Skip other records
}
buf.readUnsignedByte(); // crc
break;
default:
return null; // Ignore unsupported types of package
}
recordType = buf.readByte(); // The last byte in package is end sign
}
sendPackageResponse(channel, index);
return positions;
}
}
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