Example usage for java.nio ByteBuffer remaining

Introduction

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

Prototype

public final int remaining() 

Source Link

Document

Returns the number of remaining elements in this buffer, that is limit - position .

Usage

From source file:org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.MappableBlock.java

/**
 * Reads bytes into a buffer until EOF or the buffer's limit is reached
 *//*ww  w.  j av a 2 s  .  com*/
private static int fillBuffer(FileChannel channel, ByteBuffer buf) throws IOException {
    int bytesRead = channel.read(buf);
    if (bytesRead < 0) {
        //EOF
        return bytesRead;
    }
    while (buf.remaining() > 0) {
        int n = channel.read(buf);
        if (n < 0) {
            //EOF
            return bytesRead;
        }
        bytesRead += n;
    }
    return bytesRead;
}

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From source file:com.openteach.diamond.network.waverider.slave.SlaveState.java

public static SlaveState fromByteBuffer(ByteBuffer buffer) {
    ByteArrayInputStream bin = null;
    ObjectInputStream oin = null;
    try {//from  w  ww  . j av  a 2s .  c o m
        bin = new ByteArrayInputStream(buffer.array(), Packet.getHeaderSize() + Command.getHeaderSize(),
                buffer.remaining());
        oin = new ObjectInputStream(bin);
        return (SlaveState) oin.readObject();
    } catch (IOException e) {
        logger.error(e);
        throw new RuntimeException(e);
    } catch (ClassNotFoundException e) {
        logger.error(e);
        throw new RuntimeException(e);
    } finally {
        if (oin != null) {
            try {
                oin.close();
            } catch (IOException e) {
                logger.error(e);
            }
        }
    }
}

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From source file:com.healthmarketscience.jackcess.impl.office.EncryptionHeader.java

private static String readCspName(ByteBuffer buffer) {

    // unicode string, must be multiple of 2
    int rem = (buffer.remaining() / 2) * 2;
    String cspName = "";
    if (rem > 0) {

        ByteBuffer cspNameBuf = ByteBuffer.wrap(ByteUtil.getBytes(buffer, rem));
        CharBuffer tmpCspName = UNICODE_CHARSET.decode(cspNameBuf);

        // should be null terminated, strip that
        for (int i = 0; i < tmpCspName.limit(); ++i) {
            if (tmpCspName.charAt(i) == '\0') {
                tmpCspName.limit(i);/* w w w. jav a  2 s. c o  m*/
                break;
            }
        }

        cspName = tmpCspName.toString();
    }

    return cspName;
}

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From source file:com.aerohive.nms.engine.admin.task.licensemgr.license.processor2.PacketUtil.java

public static byte[] split(ByteBuffer buf, Header header) {
    header.setPacketType(buf.get());//from  ww w .  j  a v a 2  s  .  c om
    header.setLength(buf.getInt());
    header.setProtocolVersion(buf.get());
    header.setSecretFlag(buf.get() == CommConst.Secret_Flag_Yes ? true : false);

    byte[] content = new byte[buf.remaining()];
    buf.get(content);

    if (header.isSecretFlag()) {
        byte[] outb = decryptData(content);
        return outb;
    } else {
        return content;
    }
}

---

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./*from  w w w.ja va  2 s.  c  o  m*/
 * <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();
    }
}

---

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) {// w  w w .jav  a2s. c o m
    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:com.openteach.diamond.network.waverider.master.MasterState.java

public static MasterState fromByteBuffer(ByteBuffer buffer) {
    ByteArrayInputStream bin = null;
    ObjectInputStream oin = null;
    try {/* ww w . j a  v  a  2s. c  o  m*/
        bin = new ByteArrayInputStream(buffer.array(), Packet.getHeaderSize() + Command.getHeaderSize(),
                buffer.remaining());
        oin = new ObjectInputStream(bin);
        return (MasterState) oin.readObject();
    } catch (IOException e) {
        logger.error(e);
        throw new RuntimeException(e);
    } catch (ClassNotFoundException e) {
        logger.error(e);
        throw new RuntimeException(e);
    } finally {
        try {
            if (oin != null) {
                oin.close();
            }
            if (bin != null) {
                bin.close();
            }
        } catch (IOException e) {
            logger.error(e);
        }
    }
}

---

From source file:com.icloud.framework.core.util.FBUtilities.java

public static int byteBufferToInt(ByteBuffer bytes) {
    if (bytes.remaining() < 4) {
        throw new IllegalArgumentException("An integer must be 4 bytes in size.");
    }/*from   ww  w .  j  a v a  2 s.c  om*/
    int n = 0;
    for (int i = 0; i < 4; ++i) {
        n <<= 8;
        n |= bytes.array()[bytes.position() + bytes.arrayOffset() + i] & 0xFF;
    }
    return n;
}

---

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  w  w  .  j a va2s  . c o  m
        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);
}

---

From source file:com.buaa.cfs.utils.IOUtils.java

/**
 * Write a ByteBuffer to a WritableByteChannel, handling short writes.
 *
 * @param bc  The WritableByteChannel to write to
 * @param buf The input buffer/*from w  w w  . j a v  a2s .  c  o m*/
 *
 * @throws IOException On I/O error
 */
public static void writeFully(WritableByteChannel bc, ByteBuffer buf) throws IOException {
    do {
        bc.write(buf);
    } while (buf.remaining() > 0);
}

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