Example usage for io.netty.buffer ByteBuf isReadable

Introduction

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

Prototype

public abstract boolean isReadable(int size);

Source Link

Document

Returns true if and only if this buffer contains equal to or more than the specified number of elements.

Usage

From source file:org.jfxvnc.net.rfb.codec.decoder.rect.CopyRectDecoder.java

License:Apache License

@Override
public boolean decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {

    if (!in.isReadable(4)) {
        return false;
    }// w w w  .ja v a  2 s  .c o  m
    int sryX = in.readShort();
    int srcY = in.readShort();

    out.add(new CopyImageRect(rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight(), sryX, srcY));
    return true;
}

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From source file:org.jfxvnc.net.rfb.codec.decoder.rect.ZlibRectDecoder.java

License:Apache License

@Override
public boolean decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
    if (!initialized) {
        if (!in.isReadable(4)) {
            return false;
        }// w  ww  .j av a 2  s  .co  m
        capacity = (int) in.readUnsignedInt();
        initialized = true;
    }
    return super.decode(ctx, in, out);
}

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From source file:org.jfxvnc.net.rfb.codec.decoder.ServerCutTextDecoder.java

License:Apache License

@Override
public boolean decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {

    if (!in.isReadable(8)) {
        return false;
    }/*  w  w  w .  j  a  v  a 2s. c  om*/

    in.markReaderIndex();

    in.skipBytes(4);
    int length = in.readInt();

    if (!in.isReadable(length)) {
        in.resetReaderIndex();
        return false;
    }

    byte[] text = new byte[length];
    in.readBytes(text);
    out.add(new ServerCutTextEvent(new String(text, StandardCharsets.ISO_8859_1)));
    return true;
}

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From source file:org.jfxvnc.net.rfb.codec.security.vncauth.VncAuthDecoder.java

License:Apache License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
    if (!in.isReadable(16)) {
        return;/*  www .ja  v a2 s. com*/
    }
    byte[] challenge = new byte[16];
    in.readBytes(challenge);
    out.add(new VncAuthSecurityMessage(challenge));
}

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From source file:org.l2junity.loginserver.network.client.crypt.Crypt.java

License:Open Source License

@Override
public void encrypt(ByteBuf buf) {
    // Ensure that byte order is little endian because we set new packet size in first 2 bytes
    if (buf.order() != ByteOrder.LITTLE_ENDIAN) {
        buf = buf.order(ByteOrder.LITTLE_ENDIAN);
    }/*from   w  ww .j  ava2 s  .  co m*/

    // Checksum & XOR Key or Checksum only
    buf.writeZero(_static ? 8 : 4);

    // Padding
    buf.writeZero(8 - (buf.readableBytes() % 8));

    if (_static) {
        _static = false;

        int key = Rnd.nextInt();
        buf.skipBytes(4); // The first 4 bytes are ignored
        while (buf.readerIndex() < (buf.writerIndex() - 8)) {
            int data = buf.readInt();
            key += data;
            data ^= key;
            buf.setInt(buf.readerIndex() - 4, data);
        }
        buf.setInt(buf.readerIndex(), key);

        buf.resetReaderIndex();

        final byte[] block = new byte[8];
        while (buf.isReadable(8)) {
            buf.readBytes(block);
            STATIC_BLOWFISH_ENGINE.encryptBlock(block, 0);
            buf.setBytes(buf.readerIndex() - block.length, block);
        }
    } else {
        int checksum = 0;
        while (buf.isReadable(8)) {
            checksum ^= buf.readInt();
        }
        buf.setInt(buf.readerIndex(), checksum);

        buf.resetReaderIndex();

        final byte[] block = new byte[8];
        while (buf.isReadable(8)) {
            buf.readBytes(block);
            _blowfishEngine.encryptBlock(block, 0);
            buf.setBytes(buf.readerIndex() - block.length, block);
        }
    }
}

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From source file:org.l2junity.loginserver.network.client.crypt.Crypt.java

License:Open Source License

@Override
public void decrypt(ByteBuf buf) {
    // Packet size must be multiple of 8
    if ((buf.readableBytes() % 8) != 0) {
        buf.clear();/*w ww .j  a v a 2 s.  c o  m*/
        return;
    }

    final byte[] block = new byte[8];
    while (buf.isReadable(8)) {
        buf.readBytes(block);
        _blowfishEngine.decryptBlock(block, 0);
        buf.setBytes(buf.readerIndex() - block.length, block);
    }

    // verify checksum also dont forget!
}

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From source file:org.opendaylight.bgp.concepts.RouteDistinguisherUtil.java

License:Open Source License

/**
 * Parses three types of route distinguisher from given ByteBuf.
 *
 * @param buffer/*  w  w w . j av a2  s. c o  m*/
 * @return RouteDistinguisher
 */
public static RouteDistinguisher parseRouteDistinguisher(final ByteBuf buffer) {
    Preconditions.checkState(buffer != null && buffer.isReadable(RD_LENGTH),
            "Cannot read Route Distinguisher from provided buffer.");
    final int type = buffer.readUnsignedShort();
    final RD_TYPE rdType = RD_TYPE.valueOf(type);
    final StringBuilder routeDistiguisher = new StringBuilder();
    switch (rdType) {
    case AS_2BYTE:
        routeDistiguisher.append(type);
        routeDistiguisher.append(SEPARATOR);
        routeDistiguisher.append(buffer.readUnsignedShort());
        routeDistiguisher.append(SEPARATOR);
        routeDistiguisher.append(buffer.readUnsignedInt());
        return new RouteDistinguisher(new RdTwoOctetAs(routeDistiguisher.toString()));
    case IPV4:
        routeDistiguisher.append(Ipv4Util.addressForByteBuf(buffer).getValue());
        routeDistiguisher.append(SEPARATOR);
        routeDistiguisher.append(buffer.readUnsignedShort());
        return new RouteDistinguisher(new RdIpv4(routeDistiguisher.toString()));
    case AS_4BYTE:
        routeDistiguisher.append(buffer.readUnsignedInt());
        routeDistiguisher.append(SEPARATOR);
        routeDistiguisher.append(buffer.readUnsignedShort());
        return new RouteDistinguisher(new RdAs(routeDistiguisher.toString()));
    default:
        // now that this RD type is not supported, we want to read the remain 6 bytes
        // in order to get the byte index correct
        for (int i = 0; i < 6; i++) {
            routeDistiguisher.append("0x").append(Integer.toHexString(buffer.readByte() & 0xFF)).append(" ");
        }
        LOG.debug("Invalid Route Distinguisher: type={}, rawRouteDistinguisherValue={}", type,
                routeDistiguisher.toString());
        throw new IllegalArgumentException("Invalid Route Distinguisher type " + type);
    }
}

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From source file:org.opendaylight.protocol.bgp.parser.spi.PathIdUtil.java

License:Open Source License

/**
 * Reads Path Identifier (4 bytes) from buffer.
 *
 * @param buffer Input buffer./*w  w w .  j a v a2s  .  c o m*/
 * @return Decoded PathId.
 */
public static PathId readPathId(final ByteBuf buffer) {
    Preconditions.checkArgument(buffer != null && buffer.isReadable(ByteBufWriteUtil.INT_BYTES_LENGTH));
    return new PathId(buffer.readUnsignedInt());
}

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