Example usage for io.netty.buffer ByteBuf readUnsignedShort

List of usage examples for io.netty.buffer ByteBuf readUnsignedShort

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Introduction

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

Prototype

public abstract int readUnsignedShort();

Source Link

Document

Gets an unsigned 16-bit short integer at the current readerIndex and increases the readerIndex by 2 in this buffer.

Usage

From source file:com.dempe.chat.common.mqtt.codec.MessageIDDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws Exception {
    in.resetReaderIndex();/*w w  w  .j  a v a2  s.  c om*/
    //Common decoding part
    MessageIDMessage message = createMessage();
    if (!decodeCommonHeader(message, 0x00, in)) {
        in.resetReaderIndex();
        return;
    }

    //read  messageIDs
    message.setMessageID(in.readUnsignedShort());
    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.PublishDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws Exception {
    LOG.debug("decode invoked with buffer {}", in);
    in.resetReaderIndex();/*from  w w  w  .  j av  a 2s. c  om*/
    int startPos = in.readerIndex();

    //Common decoding part
    PublishMessage message = new PublishMessage();
    if (!decodeCommonHeader(message, in)) {
        LOG.debug("decode ask for more data after {}", in);
        in.resetReaderIndex();
        return;
    }

    if (Utils.isMQTT3_1_1(ctx)) {
        if (message.getQos() == AbstractMessage.QOSType.MOST_ONE && message.isDupFlag()) {
            //bad protocol, if QoS=0 => DUP = 0
            throw new CorruptedFrameException("Received a PUBLISH with QoS=0 & DUP = 1, MQTT 3.1.1 violation");
        }

        if (message.getQos() == AbstractMessage.QOSType.RESERVED) {
            throw new CorruptedFrameException(
                    "Received a PUBLISH with QoS flags setted 10 b11, MQTT 3.1.1 violation");
        }
    }

    int remainingLength = message.getRemainingLength();

    //Topic name
    String topic = Utils.decodeString(in);
    if (topic == null) {
        in.resetReaderIndex();
        return;
    }
    //[MQTT-3.3.2-2] The Topic Name in the PUBLISH Packet MUST NOT contain wildcard characters.
    if (topic.contains("+") || topic.contains("#")) {
        throw new CorruptedFrameException(
                "Received a PUBLISH with topic containing wild card chars, topic: " + topic);
    }
    //check topic is at least one char [MQTT-4.7.3-1]
    if (topic.length() == 0) {
        throw new CorruptedFrameException("Received a PUBLISH with topic without any character");
    }

    message.setTopicName(topic);

    if (message.getQos() == AbstractMessage.QOSType.LEAST_ONE
            || message.getQos() == AbstractMessage.QOSType.EXACTLY_ONCE) {
        message.setMessageID(in.readUnsignedShort());
    }
    int stopPos = in.readerIndex();

    //read the payload
    int payloadSize = remainingLength - (stopPos - startPos - 2)
            + (Utils.numBytesToEncode(remainingLength) - 1);
    if (in.readableBytes() < payloadSize) {
        in.resetReaderIndex();
        return;
    }
    ByteBuf bb = Unpooled.buffer(payloadSize);
    in.readBytes(bb);
    message.setPayload(bb.nioBuffer());

    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.PubRelDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws UnsupportedEncodingException {
    in.resetReaderIndex();//  w  w w  .  j a  v  a  2s . c  o  m
    //Common decoding part
    MessageIDMessage message = new PubRelMessage();
    if (!decodeCommonHeader(message, 0x02, in)) {
        in.resetReaderIndex();
        return;
    }

    //read  messageIDs
    message.setMessageID(in.readUnsignedShort());
    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.SubAckDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws Exception {
    //Common decoding part
    in.resetReaderIndex();/*w w w  .j  av a  2s .c o m*/
    SubAckMessage message = new SubAckMessage();
    if (!decodeCommonHeader(message, 0x00, in)) {
        in.resetReaderIndex();
        return;
    }
    int remainingLength = message.getRemainingLength();

    //MessageID
    message.setMessageID(in.readUnsignedShort());
    remainingLength -= 2;

    //Qos array
    if (in.readableBytes() < remainingLength) {
        in.resetReaderIndex();
        return;
    }
    for (int i = 0; i < remainingLength; i++) {
        byte qos = in.readByte();
        message.addType(AbstractMessage.QOSType.valueOf(qos));
    }

    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.SubscribeDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws Exception {
    //Common decoding part
    SubscribeMessage message = new SubscribeMessage();
    in.resetReaderIndex();/*from   ww w .  j  a va 2  s.  c om*/
    if (!decodeCommonHeader(message, 0x02, in)) {
        in.resetReaderIndex();
        return;
    }

    //check qos level
    if (message.getQos() != AbstractMessage.QOSType.LEAST_ONE) {
        throw new CorruptedFrameException(
                "Received SUBSCRIBE message with QoS other than LEAST_ONE, was: " + message.getQos());
    }

    int start = in.readerIndex();
    //read  messageIDs
    message.setMessageID(in.readUnsignedShort());
    int read = in.readerIndex() - start;
    while (read < message.getRemainingLength()) {
        decodeSubscription(in, message);
        read = in.readerIndex() - start;
    }

    if (message.subscriptions().isEmpty()) {
        throw new CorruptedFrameException("subscribe MUST have got at least 1 couple topic/QoS");
    }

    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.UnsubscribeDecoder.java

License:Open Source License

@Override
void decode(AttributeMap ctx, ByteBuf in, List<Object> out) throws Exception {
    //Common decoding part
    in.resetReaderIndex();/*from   w w  w  . j a v  a2  s  . c o m*/
    UnsubscribeMessage message = new UnsubscribeMessage();
    if (!decodeCommonHeader(message, 0x02, in)) {
        in.resetReaderIndex();
        return;
    }

    //check qos level
    if (message.getQos() != AbstractMessage.QOSType.LEAST_ONE) {
        throw new CorruptedFrameException(
                "Found an Unsubscribe message with qos other than LEAST_ONE, was: " + message.getQos());
    }

    int start = in.readerIndex();
    //read  messageIDs
    message.setMessageID(in.readUnsignedShort());
    int read = in.readerIndex() - start;
    while (read < message.getRemainingLength()) {
        String topicFilter = Utils.decodeString(in);
        //check topic is at least one char [MQTT-4.7.3-1]
        if (topicFilter.length() == 0) {
            throw new CorruptedFrameException("Received an UNSUBSCRIBE with empty topic filter");
        }
        message.addTopicFilter(topicFilter);
        read = in.readerIndex() - start;
    }
    if (message.topicFilters().isEmpty()) {
        throw new CorruptedFrameException("unsubscribe MUST have got at least 1 topic");
    }
    out.add(message);
}

From source file:com.dempe.chat.common.mqtt.codec.Utils.java

License:Open Source License

/**
 * Read a byte array from the buffer, use two bytes as length information followed by length bytes.
 *///w  ww  .  j a va2s  . c om
static byte[] readFixedLengthContent(ByteBuf in) throws UnsupportedEncodingException {
    if (in.readableBytes() < 2) {
        return null;
    }
    int strLen = in.readUnsignedShort();
    if (in.readableBytes() < strLen) {
        return null;
    }
    byte[] strRaw = new byte[strLen];
    in.readBytes(strRaw);

    return strRaw;
}

From source file:com.digitalpetri.modbus.codec.MbapHeader.java

License:Apache License

public static MbapHeader decode(ByteBuf buffer) {
    return new MbapHeader(buffer.readShort(), buffer.readUnsignedShort(), buffer.readUnsignedShort(),
            buffer.readUnsignedByte());/*from  ww  w.  j a  v a 2  s  . c  o  m*/
}

From source file:com.digitalpetri.modbus.codec.ModbusRequestDecoder.java

License:Apache License

private ReadCoilsRequest decodeReadCoils(ByteBuf buffer) {
    int address = buffer.readUnsignedShort();
    int quantity = buffer.readUnsignedShort();

    return new ReadCoilsRequest(address, quantity);
}

From source file:com.digitalpetri.modbus.codec.ModbusRequestDecoder.java

License:Apache License

private ReadDiscreteInputsRequest decodeReadDiscreteInputs(ByteBuf buffer) {
    int address = buffer.readUnsignedShort();
    int quantity = buffer.readUnsignedShort();

    return new ReadDiscreteInputsRequest(address, quantity);
}