Example usage for io.netty.buffer ByteBuf resetReaderIndex

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

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Introduction

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

Prototype

public abstract ByteBuf resetReaderIndex();

Source Link

Document

Repositions the current readerIndex to the marked readerIndex in this buffer.

Usage

From source file:uk.ac.lancs.stopcock.netty.OpenFlowDecoder.java

License:Apache License

@Override
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> objects)
        throws Exception {
    /* Sanity check. */
    if (byteBuf.readableBytes() < 8) {
        throw new IllegalStateException();
    }//from  w w w.ja v  a  2 s. co  m

    /* Read OpenFlow Header. */
    short version = byteBuf.readUnsignedByte();
    short typeId = byteBuf.readUnsignedByte();
    int length = byteBuf.readUnsignedShort();
    long transactionId = byteBuf.readUnsignedInt();

    /* Sanity check that we have enough data. */
    if (byteBuf.readableBytes() < (length - 8)) {
        throw new IllegalStateException();
    }

    /* Copy the data portion of the OpenFlow packet and store it. */
    byteBuf.resetReaderIndex();
    byte[] originalData = byteBuf.readBytes(length).array();

    /* Construct the OpenFlow header and container for both it and data. */
    Header header = new Header(version, typeId, length, transactionId);
    Type type = Type.getById(typeId);

    /* Get full openflow packet for processing with openflowj */
    byteBuf.resetReaderIndex();

    /* Call openflowj using our Netty 3.9.X -> Netty 4.0.0 proxy object. */
    OFMessage message = OFFactories.getGenericReader().readFrom(new NettyCompatibilityChannelBuffer(byteBuf));

    /* Container object for header, raw data and openflowj message. */
    Container container = new Container(header, originalData, type, message);

    /* Add to the Netty pipeline. */
    objects.add(container);
}

From source file:uk.co.thinkofdeath.prismarine.network.VarIntFrameCodec.java

License:Apache License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
    // Return back to this point if the varint isn't complete
    in.markReaderIndex();/* w  ww .  j  av a 2  s  . c o  m*/

    int val = 0;
    int bytes = 0;
    while (true) {
        if (!in.isReadable()) {
            in.resetReaderIndex();
            return;
        }

        int b = in.readByte();
        val |= (b & 0b01111111) << (bytes++ * 7);
        if (bytes >= 3) { // Smaller limit for packets
            throw new DecoderException("VarInt too big");
        }

        // If the 8th bit is set then the varint continues
        if ((b & 0x80) == 0) {
            break;
        }
    }

    if (!in.isReadable(val)) {
        // Packet isn't complete yet
        in.resetReaderIndex();
        return;
    }
    out.add(in.readBytes(val));
}

From source file:waazdoh.cp2p.messaging.MessageDecoder.java

License:Open Source License

@Override
protected void decode(ChannelHandlerContext arg0, ByteBuf cb, List<Object> msgs) throws Exception {
    if (cb.readableBytes() < 8)
        return;//from   w  w w . jav  a  2 s .co m
    cb.markReaderIndex();
    int length = cb.readInt();

    if (cb.readableBytes() < length) {
        log.info("missing readablebytes " + cb.readableBytes() + " vs " + length);
        cb.resetReaderIndex();
        return;
    }

    byte[] bs = new byte[length];
    cb.readBytes(bs);

    DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bs));
    msgs.add(parse(dis));
}