Example usage for io.netty.buffer ByteBuf writerIndex

Introduction

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

Prototype

public abstract int writerIndex();

Source Link

Document

Returns the writerIndex of this buffer.

Usage

From source file:org.traccar.protocol.Gt06FrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() < 5) {
        return null;
    }//w w w.j av a 2 s. com

    int length = 2 + 2; // head and tail

    if (buf.getByte(buf.readerIndex()) == 0x78) {
        length += 1 + buf.getUnsignedByte(buf.readerIndex() + 2);
    } else {
        length += 2 + buf.getUnsignedShort(buf.readerIndex() + 2);
    }

    if (buf.readableBytes() >= length && buf.getUnsignedShort(buf.readerIndex() + length - 2) == 0x0d0a) {
        return buf.readRetainedSlice(length);
    }

    int endIndex = buf.readerIndex() - 1;
    do {
        endIndex = buf.indexOf(endIndex + 1, buf.writerIndex(), (byte) 0x0d);
        if (endIndex > 0 && buf.writerIndex() > endIndex + 1 && buf.getByte(endIndex + 1) == 0x0a) {
            return buf.readRetainedSlice(endIndex + 2 - buf.readerIndex());
        }
    } while (endIndex > 0);

    return null;
}

From source file:org.traccar.protocol.Gt06ProtocolDecoder.java

License:Apache License

private void sendResponse(Channel channel, boolean extended, int type, int index, ByteBuf content) {
    if (channel != null) {
        ByteBuf response = Unpooled.buffer();
        int length = 5 + (content != null ? content.readableBytes() : 0);
        if (extended) {
            response.writeShort(0x7979);
            response.writeShort(length);
        } else {//from  www . ja v  a2s. c o  m
            response.writeShort(0x7878);
            response.writeByte(length);
        }
        response.writeByte(type);
        if (content != null) {
            response.writeBytes(content);
            content.release();
        }
        response.writeShort(index);
        response.writeShort(
                Checksum.crc16(Checksum.CRC16_X25, response.nioBuffer(2, response.writerIndex() - 2)));
        response.writeByte('\r');
        response.writeByte('\n'); // ending
        channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
    }
}

From source file:org.traccar.protocol.Gt06ProtocolDecoder.java

License:Apache License

private void sendPhotoRequest(Channel channel, int pictureId) {
    ByteBuf photo = photos.get(pictureId);
    ByteBuf content = Unpooled.buffer();
    content.writeInt(pictureId);/*from   w  ww .  j  a  va2s  .  c  o m*/
    content.writeInt(photo.writerIndex());
    content.writeShort(Math.min(photo.writableBytes(), 1024));
    sendResponse(channel, false, MSG_X1_PHOTO_DATA, 0, content);
}

From source file:org.traccar.protocol.Gt06ProtocolDecoder.java

License:Apache License

private Object decodeBasic(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {

    int length = buf.readUnsignedByte();
    int dataLength = length - 5;
    int type = buf.readUnsignedByte();

    DeviceSession deviceSession = null;/*from   w w  w  .  j a  va 2s . co  m*/
    if (type != MSG_LOGIN) {
        deviceSession = getDeviceSession(channel, remoteAddress);
        if (deviceSession == null) {
            return null;
        }
        if (deviceSession.getTimeZone() == null) {
            deviceSession.setTimeZone(getTimeZone(deviceSession.getDeviceId()));
        }
    }

    if (type == MSG_LOGIN) {

        String imei = ByteBufUtil.hexDump(buf.readSlice(8)).substring(1);
        buf.readUnsignedShort(); // type

        deviceSession = getDeviceSession(channel, remoteAddress, imei);
        if (deviceSession != null && deviceSession.getTimeZone() == null) {
            deviceSession.setTimeZone(getTimeZone(deviceSession.getDeviceId()));
        }

        if (dataLength > 10) {
            int extensionBits = buf.readUnsignedShort();
            int hours = (extensionBits >> 4) / 100;
            int minutes = (extensionBits >> 4) % 100;
            int offset = (hours * 60 + minutes) * 60;
            if ((extensionBits & 0x8) != 0) {
                offset = -offset;
            }
            if (deviceSession != null) {
                TimeZone timeZone = deviceSession.getTimeZone();
                if (timeZone.getRawOffset() == 0) {
                    timeZone.setRawOffset(offset * 1000);
                    deviceSession.setTimeZone(timeZone);
                }
            }

        }

        if (deviceSession != null) {
            sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null);
        }

    } else if (type == MSG_HEARTBEAT) {

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

        getLastLocation(position, null);

        int status = buf.readUnsignedByte();
        position.set(Position.KEY_ARMED, BitUtil.check(status, 0));
        position.set(Position.KEY_IGNITION, BitUtil.check(status, 1));
        position.set(Position.KEY_CHARGE, BitUtil.check(status, 2));

        if (buf.readableBytes() >= 2 + 6) {
            position.set(Position.KEY_BATTERY, buf.readUnsignedShort() * 0.01);
        }
        if (buf.readableBytes() >= 1 + 6) {
            position.set(Position.KEY_RSSI, buf.readUnsignedByte());
        }

        sendResponse(channel, false, type, buf.getShort(buf.writerIndex() - 6), null);

        return position;

    } else if (type == MSG_ADDRESS_REQUEST) {

        String response = "NA&&NA&&0##";
        ByteBuf content = Unpooled.buffer();
        content.writeByte(response.length());
        content.writeInt(0);
        content.writeBytes(response.getBytes(StandardCharsets.US_ASCII));
        sendResponse(channel, true, MSG_ADDRESS_RESPONSE, 0, content);

    } else if (type == MSG_TIME_REQUEST) {

        Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
        ByteBuf content = Unpooled.buffer();
        content.writeByte(calendar.get(Calendar.YEAR) - 2000);
        content.writeByte(calendar.get(Calendar.MONTH) + 1);
        content.writeByte(calendar.get(Calendar.DAY_OF_MONTH));
        content.writeByte(calendar.get(Calendar.HOUR_OF_DAY));
        content.writeByte(calendar.get(Calendar.MINUTE));
        content.writeByte(calendar.get(Calendar.SECOND));
        sendResponse(channel, false, MSG_TIME_REQUEST, 0, content);

    } else if (type == MSG_X1_GPS || type == MSG_X1_PHOTO_INFO) {

        return decodeX1(channel, buf, deviceSession, type);

    } else if (type == MSG_WIFI || type == MSG_WIFI_2) {

        return decodeWifi(channel, buf, deviceSession, type);

    } else if (type == MSG_INFO) {

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

        getLastLocation(position, null);

        position.set(Position.KEY_POWER, buf.readShort() * 0.01);

        return position;

    } else {

        return decodeBasicOther(channel, buf, deviceSession, type, dataLength);

    }

    return null;
}