diff options
Diffstat (limited to 'src/org/traccar/protocol/Arnavi4ProtocolDecoder.java')
| -rw-r--r-- | src/org/traccar/protocol/Arnavi4ProtocolDecoder.java | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Arnavi4ProtocolDecoder.java b/src/org/traccar/protocol/Arnavi4ProtocolDecoder.java new file mode 100644 index 000000000..06abb563f --- /dev/null +++ b/src/org/traccar/protocol/Arnavi4ProtocolDecoder.java @@ -0,0 +1,182 @@ +/* + * 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; + +public class Arnavi4ProtocolDecoder extends BaseProtocolDecoder { + + private static final byte HEADER_START_SIGN = (byte) 0xff; + private static final byte HEADER_VERSION_1 = 0x22; + private static final byte HEADER_VERSION_2 = 0x23; + + 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 sendResponse(Channel channel, byte version, int index) { + if (channel != null) { + final ChannelBuffer response; + if (version == HEADER_VERSION_1) { + response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 4); + response.writeByte(0x7b); + response.writeByte(0x00); + response.writeByte((byte) index); + response.writeByte(0x7d); + } else if (version == HEADER_VERSION_2) { + response = ChannelBuffers.dynamicBuffer(ByteOrder.LITTLE_ENDIAN, 9); + response.writeByte(0x7b); + response.writeByte(0x04); + response.writeByte(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 header's versions + } + 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) { + sendResponse(channel, version, 0); + } + + 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 types of record + } + + buf.readUnsignedByte(); // crc + break; + + default: + return null; // Ignore unsupported types of record + } + + recordType = buf.readByte(); + } + + sendResponse(channel, HEADER_VERSION_1, index); + + return positions; + } + +} |