Example usage for java.nio ByteBuffer get

Introduction

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

Prototype

public abstract byte get(int index);

Source Link

Document

Returns the byte at the specified index and does not change the position.

Usage

From source file:Main.java

/**
 * <p>Decompresses a the content of a file from {@code startPosition} of {@code compressedSize}
 * and return the bytes of it. If a {@code compressedSize} can be provided if it is known
 * how large the decompressed content will be.</p>
 *
 * @param file             the file/*from w ww  .  java 2 s.co  m*/
 * @param startPosition    the start position
 * @param compressedSize   the compresse
 * @param decompressedSize the decompressed size
 * @return the decompressed bytes
 * @throws IOException         if there was any io issues
 * @throws DataFormatException if there was an issue decompressing content
 */
public static byte[] decompress(File file, int startPosition, int compressedSize, int decompressedSize)
        throws IOException, DataFormatException {

    if (decompressedSize == 0) {
        return decompress(file, startPosition, compressedSize);
    }

    try (FileChannel fileChannel = FileChannel.open(file.toPath())) {
        ByteBuffer buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, startPosition, compressedSize);
        Inflater inflater = new Inflater();
        byte[] compressedBytes = new byte[compressedSize];
        byte[] bytes = new byte[decompressedSize];

        buffer.get(compressedBytes);
        inflater.setInput(compressedBytes, 0, compressedSize);
        inflater.inflate(bytes);
        inflater.end();

        return bytes;
    }
}

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From source file:com.l2jfree.util.HexUtil.java

public static String printData(ByteBuffer buf, int offset, int len) {
    byte[] tmp = new byte[len];
    int pos = buf.position();
    buf.position(offset);//from www  . ja  v  a 2  s.  c  o  m
    buf.get(tmp);
    buf.position(pos);
    return printData(tmp, len);
}

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From source file:com.ebay.pulsar.analytics.cache.MemcachedCache.java

private static byte[] deserializeValue(NamedKey key, byte[] bytes) {
    ByteBuffer buf = ByteBuffer.wrap(bytes);

    final int keyLength = buf.getInt();
    byte[] keyBytes = new byte[keyLength];
    buf.get(keyBytes);
    byte[] value = new byte[buf.remaining()];
    buf.get(value);//  w  w w . j a  v  a2  s  .  c o  m

    Preconditions.checkState(Arrays.equals(keyBytes, key.toByteArray()),
            "Keys do not match, possible hash collision?");
    return value;
}

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From source file:com.sm.replica.ParaList.java

public static ParaList toParaList(byte[] bytes) {
    ByteBuffer buf = ByteBuffer.wrap(bytes);
    int size = buf.getInt();
    ArrayList<StoreParas> list = new ArrayList<StoreParas>(size);
    for (int i = 0; i < size; i++) {
        // length of StoreParas
        int s = buf.getInt();
        byte[] ds = new byte[s];
        buf.get(ds);
        list.add(toStoreParas(ds));// w  w  w.  jav  a 2s.c  om

    }
    return new ParaList(list);

}

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From source file:com.linkedin.databus.core.util.StringUtils.java

/**
 * Dumps as a hex string the contents of a buffer around a position
 * @param buf     the ByteBuffer to dump
 * @param bufOfs  starting offset in the buffer
 * @param length  the number of bytes to print
 * @return the hexstring//from  ww w.ja  v a2s .  co  m
 */
public static String hexdumpByteBufferContents(ByteBuffer buf, int bufOfs, int length) {
    if (length < 0) {
        return "";
    }

    final int endOfs = Math.min(buf.limit(), bufOfs + length + 1);
    final byte[] bytes = new byte[endOfs - bufOfs];

    buf = buf.duplicate();
    buf.position(bufOfs);
    buf.get(bytes);
    return new String(Hex.encodeHex(bytes));
}

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From source file:cn.ctyun.amazonaws.util.StringUtils.java

/**
 * Base64 encodes the data in the specified byte buffer and returns it as a
 * base64 encoded string.//from www.  jav  a  2s. co m
 *
 * @param byteBuffer
 *            The data to base64 encode and return as a string.
 *
 * @return The base64 encoded contents of the specified byte buffer.
 */
public static String fromByteBuffer(ByteBuffer byteBuffer) {
    byte[] encodedBytes = null;
    if (byteBuffer.hasArray()) {
        encodedBytes = Base64.encodeBase64(byteBuffer.array());
    } else {
        byte[] binaryData = new byte[byteBuffer.limit()];
        byteBuffer.get(binaryData);
        encodedBytes = Base64.encodeBase64(binaryData);
    }
    return new String(encodedBytes);
}

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From source file:com.glaf.core.util.BinaryUtils.java

/**
 * Returns a copy of the bytes from the given <code>ByteBuffer</code>,
 * ranging from the the buffer's current position to the buffer's limit; or
 * null if the input is null.// ww w  .  ja  v  a2  s.c om
 * <p>
 * The internal states of the given byte buffer will be restored when this
 * method completes execution.
 * <p>
 * When handling <code>ByteBuffer</code> from user's input, it's typical to
 * call the {@link #copyBytesFrom(ByteBuffer)} instead of
 * {@link #copyAllBytesFrom(ByteBuffer)} so as to account for the position
 * of the input <code>ByteBuffer</code>. The opposite is typically true,
 * however, when handling <code>ByteBuffer</code> from withint the
 * unmarshallers of the low-level clients.
 */
public static byte[] copyBytesFrom(ByteBuffer bb) {
    if (bb == null)
        return null;
    if (bb.hasArray())
        return Arrays.copyOfRange(bb.array(), bb.position(), bb.limit());
    bb.mark();
    try {
        byte[] dst = new byte[bb.remaining()];
        bb.get(dst);
        return dst;
    } finally {
        bb.reset();
    }
}

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From source file:io.blobkeeper.file.util.FileUtils.java

@NotNull
public static SortedMap<Long, Block> readBlob(@NotNull IndexService indexService, @NotNull File blob,
        @NotNull Partition partition) {//from  w w  w . j  a  v  a2 s.com
    List<IndexElt> elts = new ArrayList<>(indexService.getListByPartition(partition));

    // sort it by offset, to read file consequentially
    sort(elts, new IndexEltOffsetComparator());

    List<BlockElt> blockElts = new ArrayList<>();

    for (IndexElt elt : elts) {
        try {
            ByteBuffer dataBuffer = readFile(blob, elt.getOffset(), elt.getLength());
            byte[] dataBufferBytes = new byte[dataBuffer.remaining()];
            dataBuffer.get(dataBufferBytes);

            long fileCrc = FileUtils.getCrc(dataBufferBytes);
            if (fileCrc == elt.getCrc()) {
                blockElts.add(
                        new BlockElt(elt.getId(), elt.getType(), elt.getOffset(), elt.getLength(), fileCrc));
            }
        } catch (Exception e) {
            log.error("Can't read file {} from blob", elt, e);
        }
    }

    return blockElts.stream().collect(groupingBy(BlockElt::getId)).values().stream()
            .map(groupedElts -> new Block(groupedElts.get(0).getId(),
                    groupedElts.stream().sorted(new BlockEltComparator()).collect(toImmutableList())))
            .collect(
                    // TODO: replace with ImmutableSortedMap
                    toMap(Block::getId, Function.identity(), Utils.throwingMerger(), TreeMap::new));
}

---

From source file:Main.java

/**
 * <p>Decompresses a the content of a file from {@code startPosition} of {@code compressedSize}
 * and return the bytes of it.</p>
 *
 * @param file           the file/* w w  w. j a va 2s  . com*/
 * @param startPosition  the start position
 * @param compressedSize the compresse
 * @return the decompressed bytes
 * @throws IOException         if there was any io issues
 * @throws DataFormatException if there was an issue decompressing content
 */
public static byte[] decompress(File file, int startPosition, int compressedSize)
        throws IOException, DataFormatException {

    try (FileChannel fileChannel = FileChannel.open(file.toPath())) {
        ByteBuffer buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, startPosition, compressedSize);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Inflater inflater = new Inflater();
        byte[] compressedBytes = new byte[compressedSize];
        byte[] inflated = new byte[BUFSIZ];
        int read;

        buffer.get(compressedBytes);
        inflater.setInput(compressedBytes);

        // unzip contents
        while ((read = inflater.inflate(inflated)) != 0) {
            baos.write(inflated, 0, read);
        }

        inflater.end();

        return baos.toByteArray();
    }
}

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From source file:com.offbynull.portmapper.pcp.PcpDiscovery.java

private static Map<InetAddress, InetAddress> discoverLocalAddressesToGateways(Set<InetAddress> gateways)
        throws IOException, InterruptedException {
    Set<InetAddress> localAddresses = NetworkUtils.getAllLocalIpv4Addresses();
    List<DatagramChannel> channels = new ArrayList<>();
    final Map<DatagramChannel, InetAddress> bindMap = Collections
            .synchronizedMap(new HashMap<DatagramChannel, InetAddress>());
    final Map<InetAddress, InetAddress> localAddrToGatewayAddrMap = Collections
            .synchronizedMap(new HashMap<InetAddress, InetAddress>());

    try {//from w ww.  j  a  v a  2  s  . c om
        for (InetAddress localAddress : localAddresses) {
            DatagramChannel unicastChannel = null;
            try {
                unicastChannel = DatagramChannel.open();
                unicastChannel.configureBlocking(false);
                unicastChannel.socket().bind(new InetSocketAddress(localAddress, 0));
            } catch (IOException ioe) {
                IOUtils.closeQuietly(unicastChannel);
                throw ioe;
            }

            channels.add(unicastChannel);
            bindMap.put(unicastChannel, localAddress);
        }
    } catch (IOException ioe) {
        for (DatagramChannel channel : channels) {
            IOUtils.closeQuietly(channel);
        }
        throw ioe;
    }

    UdpCommunicator communicator = null;
    try {
        communicator = new UdpCommunicator(channels);
        communicator.startAsync().awaitRunning();
        communicator.addListener(new UdpCommunicatorListener() {

            @Override
            public void incomingPacket(InetSocketAddress sourceAddress, DatagramChannel channel,
                    ByteBuffer packet) {
                // make sure version is 2 and error isn't ADDRESS_MISMATCH and we're good to go
                if (packet.remaining() < 4
                        || packet.get(0) == 2 && packet.get(4) == PcpResultCode.ADDRESS_MISMATCH.ordinal()) {
                    return;
                }

                InetAddress localAddress = bindMap.get(channel);
                if (localAddress == null) {
                    return;
                }
                localAddrToGatewayAddrMap.put(localAddress, sourceAddress.getAddress());
            }
        });

        for (DatagramChannel channel : bindMap.keySet()) {
            for (InetAddress gateway : gateways) {
                ByteBuffer outBuf = ByteBuffer.allocate(1100);
                MapPcpRequest mpr = new MapPcpRequest(ByteBuffer.allocate(12), 0, 0, 0,
                        InetAddress.getByName("::"), 0L);
                mpr.dump(outBuf, bindMap.get(channel));
                outBuf.flip();

                communicator.send(channel, new InetSocketAddress(gateway, 5351), outBuf.asReadOnlyBuffer());
            }
        }

        Thread.sleep(5000L);
    } finally {
        if (communicator != null) {
            communicator.stopAsync().awaitTerminated();
        }
    }

    return new HashMap<>(localAddrToGatewayAddrMap);
}

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