Example usage for java.nio ByteBuffer getShort

Introduction

In this page you can find the example usage for java.nio ByteBuffer getShort.

Prototype

public abstract short getShort(int index);

Source Link

Document

Returns the short at the specified index.

Usage

From source file:org.onlab.packet.ONLabLddp.java

/**
 * Checks if packet has size of OVX-generated LLDP, and correctness of two
 * organizationally specific TLVs that use ON.Lab's OUI. Assumes packet is
 * valid LLDP packet//  www.ja  v  a 2  s  .  c  o  m
 *
 * @param packet packet data
 * @return eth type or -1
 */
public static short isOVXLLDP(byte[] packet) {
    if (packet.length < OVX_LLDP_SIZE) {
        return -1;
    }

    // Extra offset due to VLAN tag
    final ByteBuffer bb = ByteBuffer.wrap(packet);
    int offset = 0;
    short ethType = bb.getShort(ETHERTYPE_OFFSET);
    if (ethType != Ethernet.TYPE_LLDP && ethType != Ethernet.TYPE_BSN) {
        offset = 4;
        ethType = bb.getShort(ETHERTYPE_OFFSET + offset);
        if (ethType != Ethernet.TYPE_LLDP && ethType != Ethernet.TYPE_BSN) {
            return -1;
        }
    }

    // Compare packet's organizationally specific TLVs to the expected
    // values
    for (int i = 0; i < OUI_TLV.length; i++) {
        if (packet[NAME_TLV_OFFSET + offset + i] != OUI_TLV[i]) {
            return -1;
        }
    }

    return ethType;
}

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From source file:net.onrc.openvirtex.packet.OVXLLDP.java

/**
 * Extracts dpid and port from OVX-generated LLDP packet.
 *
 * @param packet/*from   w  ww.  j  a v  a2 s  .c om*/
 * @return Dpid and port
 */
public static DPIDandPort parseLLDP(final byte[] packet) {
    final ByteBuffer bb = ByteBuffer.wrap(packet);

    // Extra offset due to VLAN tag
    int offset = 0;
    if (bb.getShort(ETHERTYPE_OFFSET) != Ethernet.TYPE_LLDP
            && bb.getShort(ETHERTYPE_OFFSET) != Ethernet.TYPE_BSN) {
        offset = 4;
    }

    final short port = bb.getShort(PORT_OFFSET + offset);
    final long dpid = bb.getLong(DPID_OFFSET + offset);

    return new DPIDandPort(dpid, port);
}

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From source file:org.onlab.packet.ONLabLddp.java

/**
 * Extracts dpid and port from OVX-generated LLDP packet.
 *
 * @param packet packet data// w  w  w  .  jav  a2s.co  m
 * @return Dpid and port
 */
public static DPIDandPort parseLLDP(final byte[] packet) {
    final ByteBuffer bb = ByteBuffer.wrap(packet);

    // Extra offset due to VLAN tag
    int offset = 0;
    if (bb.getShort(ETHERTYPE_OFFSET) != Ethernet.TYPE_LLDP
            && bb.getShort(ETHERTYPE_OFFSET) != Ethernet.TYPE_BSN) {
        offset = 4;
    }

    final int port = bb.getInt(PORT_OFFSET + offset);
    final long dpid = bb.getLong(DPID_OFFSET + offset);

    return new DPIDandPort(dpid, port);
}

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From source file:com.linkedin.databus.core.DbusEventPart.java

/**
 * Decodes a bytebuffer and returns DbusEventPart. Preserves the ByteBuffer position.
 * @param buf/*from   ww  w  .j a v  a  2 s  .  c  o m*/
 * @return
 */
public static DbusEventPart decode(ByteBuffer buf) {
    int pos = buf.position();
    int dataLen = buf.getInt(pos);
    if (dataLen < 0) {
        throw new UnsupportedOperationException("Data length " + dataLen + " not supported");
    }
    short attributes = buf.getShort(pos + AttributesOffset);
    short schemaVersion = (short) (attributes >> VERSION_SHIFT);
    SchemaDigestType schemaDigestType = digestType(attributes);
    int digestLen = digestLen(schemaDigestType);
    byte[] digest = new byte[digestLen];
    for (int i = 0; i < digestLen; i++) {
        digest[i] = buf.get(pos + AttributesOffset + AttributesLen + i);
    }

    // NOTE - this will create a new ByteBuffer object pointing to the
    // same memory. So the position of this new BB is beginning of the data
    // and limit is set to the end of the data.
    ByteBuffer dataBuf = buf.asReadOnlyBuffer();
    dataBuf.position(pos + AttributesOffset + AttributesLen + digestLen);
    dataBuf.limit(dataBuf.position() + dataLen);

    return new DbusEventPart(schemaDigestType, digest, schemaVersion, dataBuf);
}

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From source file:jsave.Utils.java

/**
 * Returns an integer.//from  w  w w.ja v a2 s.c  om
 * 
 * Since java does not provide unsigned primitive types, each unsigned
 * value read from the buffer is promoted up to the next bigger primitive
 * data type : getUnsignedShort() returns an int.
 * 
 * @param bb the array of bytes in the buffer
 * @return an integer
 */
public static int getUnsignedShort(ByteBuffer bb) {
    return (bb.getShort(0) & 0xffff);
}

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From source file:gridool.memcached.gateway.BinaryCommandProxy.java

private static void xferResponse(final byte opcode, final SocketChannel src, final Channel dst,
        final String key) throws IOException {
    ByteBuffer headerBuf = ByteBuffer.allocate(BinaryProtocol.HEADER_LENGTH);
    int headerRead = NIOUtils.readFully(src, headerBuf, BinaryProtocol.HEADER_LENGTH);
    assert (headerRead == BinaryProtocol.HEADER_LENGTH) : headerRead;
    headerBuf.flip();/* ww  w . j ava  2 s  .  c  o  m*/

    if (BinaryProtocol.surpressSuccessResponse(opcode)) {
        // piggyback will never happens 
        final short status = headerBuf.getShort(6);
        if (status == 0) {
            return;
        }
    }

    ChannelBuffer res;
    int totalBody = headerBuf.getInt(8);
    if (totalBody > 0) {
        ByteBuffer bodyBuf = ByteBuffer.allocate(totalBody);
        int bodyRead = NIOUtils.readFully(src, bodyBuf, totalBody);
        assert (bodyRead == totalBody) : "bodyRead (" + bodyRead + ") != totalBody (" + totalBody + ")";
        bodyBuf.flip();
        res = ChannelBuffers.wrappedBuffer(headerBuf, bodyBuf);
    } else {
        res = ChannelBuffers.wrappedBuffer(headerBuf);
    }
    String opname = BinaryProtocol.resolveName(headerBuf.get(1));
    if (LOG.isDebugEnabled()) {
        Header header = new Header();
        header.decode(headerBuf);
        LOG.debug(
                "Start sending memcached response [" + opname + "] " + res.readableBytes() + " bytes for key '"
                        + key + "'\n" + header + '\n' + Arrays.toString(res.toByteBuffer().array()));
    }
    dst.write(res).addListener(new VerboseListener("sendResponse [" + opname + "] for key: " + key));
}

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From source file:net.onrc.openvirtex.packet.OVXLLDP.java

/**
 * Checks if LLDP packet has correct size, LLDP multicast address, and
 * ethertype. Packet assumed to have Ethernet header.
 *
 * @param packet//  ww  w . j a va  2  s . c o m
 * @return true if packet is LLDP, false otherwise
 */
public static boolean isLLDP(final byte[] packet) {
    // Does packet exist and does it have the mininum size?
    if (packet == null || packet.length < MINIMUM_LLDP_SIZE) {
        return false;
    }

    // Packet has LLDP multicast destination address?
    final ByteBuffer bb = ByteBuffer.wrap(packet);
    final byte[] dst = new byte[6];
    bb.get(dst);

    if (!(Arrays.equals(dst, OVXLLDP.LLDP_NICIRA) || Arrays.equals(dst, OVXLLDP.LLDP_MULTICAST)
            || Arrays.equals(dst, OVXLLDP.BDDP_MULTICAST))) {

        return false;
    }

    // Fetch ethertype, skip VLAN tag if it's there
    short etherType = bb.getShort(ETHERTYPE_OFFSET);
    if (etherType == ETHERTYPE_VLAN) {
        etherType = bb.getShort(ETHERTYPE_OFFSET + 4);
    }

    // Check ethertype
    if (etherType == Ethernet.TYPE_LLDP) {
        return true;
    }
    if (etherType == Ethernet.TYPE_BSN) {
        return true;
    }

    return false;

}

---

From source file:org.onlab.packet.ONLabLddp.java

/**
 * Checks if LLDP packet has correct size, LLDP multicast address, and
 * ethertype. Packet assumed to have Ethernet header.
 *
 * @param packet packet data//from ww w  . j a v  a  2s  .  c o m
 * @return true if packet is LLDP, false otherwise
 */
public static boolean isLLDP(final byte[] packet) {
    // Does packet exist and does it have the mininum size?
    if (packet == null || packet.length < MINIMUM_LLDP_SIZE) {
        return false;
    }

    // Packet has LLDP multicast destination address?
    final ByteBuffer bb = ByteBuffer.wrap(packet);
    final byte[] dst = new byte[6];
    bb.get(dst);

    if (!(Arrays.equals(dst, ONLabLddp.LLDP_NICIRA) || Arrays.equals(dst, ONLabLddp.LLDP_MULTICAST)
            || Arrays.equals(dst, ONLabLddp.BDDP_MULTICAST))) {

        return false;
    }

    // Fetch ethertype, skip VLAN tag if it's there
    short etherType = bb.getShort(ETHERTYPE_OFFSET);
    if (etherType == ETHERTYPE_VLAN) {
        etherType = bb.getShort(ETHERTYPE_OFFSET + 4);
    }

    // Check ethertype
    if (etherType == Ethernet.TYPE_LLDP) {
        return true;
    }
    if (etherType == Ethernet.TYPE_BSN) {
        return true;
    }

    return false;

}

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From source file:guru.benson.pinch.Pinch.java

/**
 * Extract all ZipEntries from the ZIP central directory.
 *
 * @param buf//from  ww  w  . j  ava  2  s .  co m
 *     The byte buffer containing the ZIP central directory.
 *
 * @return A list with all ZipEntries.
 */
private static ArrayList<ExtendedZipEntry> parseHeaders(ByteBuffer buf) {
    ArrayList<ExtendedZipEntry> zeList = new ArrayList<ExtendedZipEntry>();

    buf.order(ByteOrder.LITTLE_ENDIAN);

    int offset = 0;

    while (offset < buf.limit() - ZipConstants.CENHDR) {
        short fileNameLen = buf.getShort(offset + ZipConstants.CENNAM);
        short extraFieldLen = buf.getShort(offset + ZipConstants.CENEXT);
        short fileCommentLen = buf.getShort(offset + ZipConstants.CENCOM);

        String fileName = new String(buf.array(), offset + ZipConstants.CENHDR, fileNameLen);

        ExtendedZipEntry zeGermans = new ExtendedZipEntry(fileName);

        zeGermans.setMethod(buf.getShort(offset + ZipConstants.CENHOW));

        CRC32 crc = new CRC32();
        crc.update(buf.getInt(offset + ZipConstants.CENCRC));
        zeGermans.setCrc(crc.getValue());

        zeGermans.setCompressedSize(buf.getInt(offset + ZipConstants.CENSIZ));
        zeGermans.setSize(buf.getInt(offset + ZipConstants.CENLEN));
        zeGermans.setInternalAttr(buf.getShort(offset + ZipConstants.CENATT));
        zeGermans.setExternalAttr(buf.getShort(offset + ZipConstants.CENATX));
        zeGermans.setOffset((long) buf.getInt(offset + ZipConstants.CENOFF));

        zeGermans.setExtraLength(extraFieldLen);

        zeList.add(zeGermans);
        offset += ZipConstants.CENHDR + fileNameLen + extraFieldLen + fileCommentLen;
    }

    return zeList;
}

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From source file:edu.umn.cs.spatialHadoop.nasa.HDFRecordReader.java

/**
 * Find runs of true values in each row of the given 2D array of value.
 * @param values All the short values stored in a {@link ByteBuffer}
 * @param fillValue The marker that marks fillValue
 * @return An array of runs as one for each row in the given array.
 *///w w w  .  j  a  v a  2  s . c  o  m
static ShortArray[] findTrueRuns(ByteBuffer values, short fillValue) {
    int resolution = (int) Math.sqrt(values.limit() / 2);
    ShortArray[] trueRuns = new ShortArray[resolution];
    for (short row = 0; row < resolution; row++) {
        trueRuns[row] = new ShortArray();
        // A flag that is set to true if currently inside a run of fillValues.
        boolean insideFillValue = true;
        for (short col = 0; col < resolution; col++) {
            if ((values.getShort((row * resolution + col) * 2) == fillValue) ^ insideFillValue) {
                // Found a flip between true and fill values.
                if (!insideFillValue && col != 0)
                    trueRuns[row].append((short) (col - 1));
                else
                    trueRuns[row].append(col);
                insideFillValue = !insideFillValue;
            }
        }
        if (!insideFillValue)
            trueRuns[row].append((short) (resolution - 1));
    }
    return trueRuns;
}

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