Example usage for io.netty.buffer ByteBuf getByte

Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf getByte.

Prototype

public abstract byte getByte(int index);

Source Link

Document

Gets a byte at the specified absolute index in this buffer.

Usage

From source file:org.traccar.protocol.AtrackFrameDecoder.java

License:Apache License

@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {

    if (buf.readableBytes() >= 2) {

        if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {

            if (buf.readableBytes() >= KEEPALIVE_LENGTH) {
                return buf.readRetainedSlice(KEEPALIVE_LENGTH);
            }/* ww  w .  j a va  2 s . c  o m*/

        } else if (buf.getUnsignedShort(buf.readerIndex()) == 0x4050
                && buf.getByte(buf.readerIndex() + 2) != ',') {

            if (buf.readableBytes() > 6) {
                int length = buf.getUnsignedShort(buf.readerIndex() + 4) + 4 + 2;
                if (buf.readableBytes() >= length) {
                    return buf.readRetainedSlice(length);
                }
            }

        } else {

            int lengthStart = buf.indexOf(buf.readerIndex() + 3, buf.writerIndex(), (byte) ',') + 1;
            if (lengthStart > 0) {
                int lengthEnd = buf.indexOf(lengthStart, buf.writerIndex(), (byte) ',');
                if (lengthEnd > 0) {
                    int length = lengthEnd + Integer.parseInt(
                            buf.toString(lengthStart, lengthEnd - lengthStart, StandardCharsets.US_ASCII));
                    if (buf.readableBytes() > length && buf.getByte(buf.readerIndex() + length) == '\n') {
                        length += 1;
                    }
                    if (buf.readableBytes() >= length) {
                        return buf.readRetainedSlice(length);
                    }
                }
            } else {
                int endIndex = BufferUtil.indexOf("\r\n", buf);
                if (endIndex > 0) {
                    return buf.readRetainedSlice(endIndex - buf.readerIndex() + 2);
                }
            }

        }

    }

    return null;
}

---

From source file:org.traccar.protocol.AtrackProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {
        if (channel != null) {
            channel.writeAndFlush(new NetworkMessage(buf.retain(), remoteAddress)); // keep-alive message
        }// w  w  w  .jav  a  2 s . c o  m
        return null;
    } else if (buf.getByte(buf.readerIndex()) == '$') {
        return decodeInfo(channel, remoteAddress, buf.toString(StandardCharsets.US_ASCII).trim());
    } else if (buf.getByte(buf.readerIndex() + 2) == ',') {
        return decodeText(channel, remoteAddress, buf.toString(StandardCharsets.US_ASCII).trim());
    } else {
        return decodeBinary(channel, remoteAddress, buf);
    }
}

---

From source file:org.traccar.protocol.AutoFonProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    int type = buf.readUnsignedByte();

    if (type == MSG_LOGIN || type == MSG_45_LOGIN) {

        if (type == MSG_LOGIN) {
            buf.readUnsignedByte(); // hardware version
            buf.readUnsignedByte(); // software version
        }/*  w w w .ja  v a  2 s.  c om*/

        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);

        if (deviceSession != null && channel != null) {
            ByteBuf response = Unpooled.buffer();
            response.writeBytes("resp_crc=".getBytes(StandardCharsets.US_ASCII));
            response.writeByte(buf.getByte(buf.writerIndex() - 1));
            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
        }

        return null;

    }

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
    if (deviceSession == null) {
        return null;
    }

    if (type == MSG_LOCATION) {

        return decodePosition(deviceSession, buf, false);

    } else if (type == MSG_HISTORY) {

        int count = buf.readUnsignedByte() & 0x0f;
        buf.readUnsignedShort(); // total count
        List<Position> positions = new LinkedList<>();

        for (int i = 0; i < count; i++) {
            positions.add(decodePosition(deviceSession, buf, true));
        }

        return positions;

    } else if (type == MSG_45_LOCATION) {

        Position position = new Position(getProtocolName());
        position.setDeviceId(deviceSession.getDeviceId());

        short status = buf.readUnsignedByte();
        if (BitUtil.check(status, 7)) {
            position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
        }
        position.set(Position.KEY_BATTERY, BitUtil.to(status, 7));

        buf.skipBytes(2); // remaining time

        position.set(Position.PREFIX_TEMP + 1, buf.readByte());

        buf.skipBytes(2); // timer (interval and units)
        buf.readByte(); // mode
        buf.readByte(); // gprs sending interval

        buf.skipBytes(6); // mcc, mnc, lac, cid

        int valid = buf.readUnsignedByte();
        position.setValid(BitUtil.from(valid, 6) != 0);
        position.set(Position.KEY_SATELLITES, BitUtil.from(valid, 6));

        int time = buf.readUnsignedMedium();
        int date = buf.readUnsignedMedium();

        DateBuilder dateBuilder = new DateBuilder().setTime(time / 10000, time / 100 % 100, time % 100)
                .setDateReverse(date / 10000, date / 100 % 100, date % 100);
        position.setTime(dateBuilder.getDate());

        position.setLatitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
        position.setLongitude(convertCoordinate(buf.readUnsignedByte(), buf.readUnsignedMedium()));
        position.setSpeed(buf.readUnsignedByte());
        position.setCourse(buf.readUnsignedShort());

        return position;

    }

    return null;
}

---

From source file:org.traccar.protocol.BceFrameDecoder.java

License:Apache License

private static byte checksum(ByteBuf buf, int end) {
    byte result = 0;
    for (int i = 0; i < end; i++) {
        result += buf.getByte(buf.readerIndex() + i);
    }/*from   www  .  jav a2  s.c o m*/
    return result;
}

---

From source file:org.traccar.protocol.BceFrameDecoder.java

License:Apache License

@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {

    if (header && buf.readableBytes() >= HANDSHAKE_LENGTH) {
        buf.skipBytes(HANDSHAKE_LENGTH);
        header = false;//  www . ja  v  a2 s.c om
    }

    int end = 8; // IMEI

    while (buf.readableBytes() >= end + 2 + 1 + 1 + 1) {
        end += buf.getUnsignedShortLE(buf.readerIndex() + end) + 2;

        if (buf.readableBytes() > end && checksum(buf, end) == buf.getByte(buf.readerIndex() + end)) {
            return buf.readRetainedSlice(end + 1);
        }
    }

    return null;
}

---

From source file:org.traccar.protocol.CalAmpProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    if (BitUtil.check(buf.getByte(buf.readerIndex()), 7)) {

        int content = buf.readUnsignedByte();

        if (BitUtil.check(content, 0)) {
            String id = ByteBufUtil.hexDump(buf.readSlice(buf.readUnsignedByte()));
            getDeviceSession(channel, remoteAddress, id);
        }//from ww w  .j  a v a  2s . c om

        if (BitUtil.check(content, 1)) {
            buf.skipBytes(buf.readUnsignedByte()); // identifier type
        }

        if (BitUtil.check(content, 2)) {
            buf.skipBytes(buf.readUnsignedByte()); // authentication
        }

        if (BitUtil.check(content, 3)) {
            buf.skipBytes(buf.readUnsignedByte()); // routing
        }

        if (BitUtil.check(content, 4)) {
            buf.skipBytes(buf.readUnsignedByte()); // forwarding
        }

        if (BitUtil.check(content, 5)) {
            buf.skipBytes(buf.readUnsignedByte()); // response redirection
        }

    }

    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
    if (deviceSession == null) {
        return null;
    }

    int service = buf.readUnsignedByte();
    int type = buf.readUnsignedByte();
    int index = buf.readUnsignedShort();

    if (service == SERVICE_ACKNOWLEDGED) {
        sendResponse(channel, remoteAddress, type, index, 0);
    }

    if (type == MSG_EVENT_REPORT || type == MSG_LOCATE_REPORT || type == MSG_MINI_EVENT_REPORT) {
        return decodePosition(deviceSession, type, buf);
    }

    return null;
}

---

From source file:org.traccar.protocol.CellocatorProtocolDecoder.java

License:Apache License

private void sendReply(Channel channel, SocketAddress remoteAddress, long deviceId, byte packetNumber) {
    if (channel != null) {
        ByteBuf reply = Unpooled.buffer(28);
        reply.writeByte('M');
        reply.writeByte('C');
        reply.writeByte('G');
        reply.writeByte('P');
        reply.writeByte(MSG_SERVER_ACKNOWLEDGE);
        reply.writeIntLE((int) deviceId);
        reply.writeByte(commandCount++);
        reply.writeIntLE(0); // authentication code
        reply.writeByte(0);/*from www  .j a v a  2 s  .co  m*/
        reply.writeByte(packetNumber);
        reply.writeZero(11);

        byte checksum = 0;
        for (int i = 4; i < 27; i++) {
            checksum += reply.getByte(i);
        }
        reply.writeByte(checksum);

        channel.writeAndFlush(new NetworkMessage(reply, remoteAddress));
    }
}

---

From source file:org.traccar.protocol.CellocatorProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    boolean alternative = buf.getByte(buf.readerIndex() + 3) != 'P';

    buf.skipBytes(4); // system code
    int type = buf.readUnsignedByte();
    long deviceUniqueId = buf.readUnsignedIntLE();

    if (type != MSG_CLIENT_SERIAL) {
        buf.readUnsignedShortLE(); // communication control
    }/*  w  ww . j a  va 2 s  .  c  o m*/
    byte packetNumber = buf.readByte();

    sendReply(channel, remoteAddress, deviceUniqueId, packetNumber);

    if (type == MSG_CLIENT_STATUS) {

        Position position = new Position(getProtocolName());

        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(deviceUniqueId));
        if (deviceSession == null) {
            return null;
        }
        position.setDeviceId(deviceSession.getDeviceId());

        position.set(Position.KEY_VERSION_HW, buf.readUnsignedByte());
        position.set(Position.KEY_VERSION_FW, buf.readUnsignedByte());
        buf.readUnsignedByte(); // protocol version

        position.set(Position.KEY_STATUS, buf.readUnsignedByte() & 0x0f);

        buf.readUnsignedByte(); // operator / configuration flags
        buf.readUnsignedByte(); // reason data
        position.set(Position.KEY_ALARM, decodeAlarm(buf.readUnsignedByte()));

        position.set("mode", buf.readUnsignedByte());
        position.set(Position.KEY_INPUT, buf.readUnsignedIntLE());

        if (alternative) {
            buf.readUnsignedByte(); // input
            position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE());
            position.set(Position.PREFIX_ADC + 2, buf.readUnsignedShortLE());
        } else {
            buf.readUnsignedByte(); // operator
            position.set(Position.PREFIX_ADC + 1, buf.readUnsignedIntLE());
        }

        position.set(Position.KEY_ODOMETER, buf.readUnsignedMediumLE());

        buf.skipBytes(6); // multi-purpose data
        buf.readUnsignedShortLE(); // fix time
        buf.readUnsignedByte(); // location status
        buf.readUnsignedByte(); // mode 1
        buf.readUnsignedByte(); // mode 2

        position.set(Position.KEY_SATELLITES, buf.readUnsignedByte());

        position.setValid(true);

        if (alternative) {
            position.setLongitude(buf.readIntLE() / 10000000.0);
            position.setLatitude(buf.readIntLE() / 10000000.0);
        } else {
            position.setLongitude(buf.readIntLE() / Math.PI * 180 / 100000000);
            position.setLatitude(buf.readIntLE() / Math.PI * 180 / 100000000);
        }

        position.setAltitude(buf.readIntLE() * 0.01);

        if (alternative) {
            position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedIntLE()));
            position.setCourse(buf.readUnsignedShortLE() / 1000.0);
        } else {
            position.setSpeed(UnitsConverter.knotsFromMps(buf.readUnsignedIntLE() * 0.01));
            position.setCourse(buf.readUnsignedShortLE() / Math.PI * 180.0 / 1000.0);
        }

        DateBuilder dateBuilder = new DateBuilder()
                .setTimeReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedByte())
                .setDateReverse(buf.readUnsignedByte(), buf.readUnsignedByte(), buf.readUnsignedShortLE());
        position.setTime(dateBuilder.getDate());

        return position;
    }

    return null;
}

---

From source file:org.traccar.protocol.CellocatorProtocolEncoder.java

License:Apache License

private ByteBuf encodeContent(long deviceId, int command, int data1, int data2) {

    ByteBuf buf = Unpooled.buffer(0);
    buf.writeByte('M');
    buf.writeByte('C');
    buf.writeByte('G');
    buf.writeByte('P');
    buf.writeByte(0);//from  w ww .  j  a v a 2  s.  c  o m
    buf.writeIntLE(Integer.parseInt(getUniqueId(deviceId)));
    buf.writeByte(0); // command numerator
    buf.writeIntLE(0); // authentication code
    buf.writeByte(command);
    buf.writeByte(command);
    buf.writeByte(data1);
    buf.writeByte(data1);
    buf.writeByte(data2);
    buf.writeByte(data2);
    buf.writeIntLE(0); // command specific data

    byte checksum = 0;
    for (int i = 4; i < buf.writerIndex(); i++) {
        checksum += buf.getByte(i);
    }
    buf.writeByte(checksum);

    return buf;
}

---

From source file:org.traccar.protocol.EelinkProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    ByteBuf buf = (ByteBuf) msg;

    String uniqueId = null;//w  w  w .  j  a  v  a  2  s .co  m
    DeviceSession deviceSession;

    if (buf.getByte(0) == 'E' && buf.getByte(1) == 'L') {
        buf.skipBytes(2 + 2 + 2); // udp header
        uniqueId = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
        deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
    } else {
        deviceSession = getDeviceSession(channel, remoteAddress);
    }

    buf.skipBytes(2); // header
    int type = buf.readUnsignedByte();
    buf.readShort(); // length
    int index = buf.readUnsignedShort();

    if (type != MSG_GPS && type != MSG_DATA) {
        ByteBuf content = Unpooled.buffer();
        if (type == MSG_LOGIN) {
            content.writeInt((int) (System.currentTimeMillis() / 1000));
            content.writeByte(1); // protocol version
            content.writeByte(0); // action mask
        }
        ByteBuf response = EelinkProtocolEncoder.encodeContent(channel instanceof DatagramChannel, uniqueId,
                type, index, content);
        content.release();
        if (channel != null) {
            channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
        }
    }

    if (type == MSG_LOGIN) {

        if (deviceSession == null) {
            getDeviceSession(channel, remoteAddress, ByteBufUtil.hexDump(buf.readSlice(8)).substring(1));
        }

    } else {

        if (deviceSession == null) {
            return null;
        }

        if (type == MSG_GPS || type == MSG_ALARM || type == MSG_STATE || type == MSG_SMS) {

            return decodeOld(deviceSession, buf, type, index);

        } else if (type >= MSG_NORMAL && type <= MSG_OBD_CODE) {

            return decodeNew(deviceSession, buf, type, index);

        } else if (type == MSG_HEARTBEAT && buf.readableBytes() >= 2) {

            Position position = new Position(getProtocolName());
            position.setDeviceId(deviceSession.getDeviceId());

            getLastLocation(position, null);

            decodeStatus(position, buf.readUnsignedShort());

            return position;

        } else if (type == MSG_OBD) {

            return decodeObd(deviceSession, buf, index);

        } else if (type == MSG_DOWNLINK) {

            return decodeResult(deviceSession, buf, index);

        }

    }

    return null;
}

---

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