Example usage for java.nio ByteBuffer allocate

List of usage examples for java.nio ByteBuffer allocate

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Introduction

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

Prototype

public static ByteBuffer allocate(int capacity)

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:mtmo.test.mediadrm.Utils.java

public static String accountIdToMarlinFormat(final String accountId) {
    ByteBuffer accountIdBuf = ByteBuffer.allocate(BYTES_OF_ACCOUNT_ID);
    try {// www  .j  a  v  a2 s  .co m
        accountIdBuf.putLong(Long.valueOf(accountId));
    } catch (Exception e) {
        return null;
    }
    accountIdBuf.order(ByteOrder.LITTLE_ENDIAN);
    return String.format(Locale.US, "%016x", accountIdBuf.getLong(0));
}

From source file:MainClass.java

private static void createFile() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/primes.bin");
    FileOutputStream outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    LongBuffer longBuf = buf.asLongBuffer();
    int primesWritten = 0;
    while (primesWritten < primes.length) {
        longBuf.put(primes, primesWritten, min(longBuf.capacity(), primes.length - primesWritten));
        buf.limit(8 * longBuf.position());

        file.write(buf);/*from ww w  .ja v  a  2  s . c  o  m*/
        primesWritten += longBuf.position();
        longBuf.clear();
        buf.clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

From source file:Main.java

/**
 * @param columnarKeyBlockData//w  w w  .j  a  va2  s . c  o m
 * @param columnarKeyStoreMetadata
 * @return
 * @author s71955 The high cardinality dimensions rows will be send in byte
 * array with its data length appended in the
 * ColumnarKeyStoreDataHolder byte array since high cardinality dim
 * data will not be part of MDKey/Surrogate keys. In this method the
 * byte array will be scanned and the length which is stored in
 * short will be removed.
 */
public static List<byte[]> readColumnarKeyBlockDataForNoDictionaryCols(byte[] columnarKeyBlockData) {
    List<byte[]> columnarKeyBlockDataList = new ArrayList<byte[]>(50);
    ByteBuffer noDictionaryValKeyStoreDataHolder = ByteBuffer.allocate(columnarKeyBlockData.length);
    noDictionaryValKeyStoreDataHolder.put(columnarKeyBlockData);
    noDictionaryValKeyStoreDataHolder.flip();
    while (noDictionaryValKeyStoreDataHolder.hasRemaining()) {
        short dataLength = noDictionaryValKeyStoreDataHolder.getShort();
        byte[] noDictionaryValKeyData = new byte[dataLength];
        noDictionaryValKeyStoreDataHolder.get(noDictionaryValKeyData);
        columnarKeyBlockDataList.add(noDictionaryValKeyData);
    }
    return columnarKeyBlockDataList;

}

From source file:com.srotya.tau.nucleus.Utils.java

public static byte[] longToBytes(long x) {
    ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.putLong(x);/*from www  .  j a v a2 s  .c om*/
    return buffer.array();
}

From source file:Main.java

public static void transfer(ReadableByteChannel in, WritableByteChannel out) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocate(4096);
    while (in.read(buffer) != -1) {
        buffer.flip();//from ww  w . ja v a  2  s .c  o  m
        while (buffer.hasRemaining()) {
            out.write(buffer);
        }
        buffer.clear();
    }
}

From source file:com.inmobi.messaging.util.AuditUtil.java

public static void attachHeaders(Message m, Long timestamp) {
    byte[] b = m.getData().array();
    int messageSize = b.length;
    int totalSize = messageSize + HEADER_LENGTH;
    ByteBuffer buffer = ByteBuffer.allocate(totalSize);

    // writing version
    buffer.put((byte) currentVersion);
    // writing magic bytes
    buffer.put(magicBytes);/*from  ww w .  ja va  2 s. c  om*/
    // writing timestamp
    long time = timestamp;
    buffer.putLong(time);

    // writing message size
    buffer.putInt(messageSize);
    // writing message
    buffer.put(b);
    buffer.rewind();
    m.set(buffer);
    // return new Message(buffer);

}

From source file:Main.java

public static long findCentralDirStartOffset(final FileChannel fileChannel, final long commentLength)
        throws IOException {
    // End of central directory record (EOCD)
    // Offset    Bytes     Description[23]
    // 0           4       End of central directory signature = 0x06054b50
    // 4           2       Number of this disk
    // 6           2       Disk where central directory starts
    // 8           2       Number of central directory records on this disk
    // 10          2       Total number of central directory records
    // 12          4       Size of central directory (bytes)
    // 16          4       Offset of start of central directory, relative to start of archive
    // 20          2       Comment length (n)
    // 22          n       Comment
    // For a zip with no archive comment, the
    // end-of-central-directory record will be 22 bytes long, so
    // we expect to find the EOCD marker 22 bytes from the end.

    final ByteBuffer zipCentralDirectoryStart = ByteBuffer.allocate(4);
    zipCentralDirectoryStart.order(ByteOrder.LITTLE_ENDIAN);
    fileChannel.position(fileChannel.size() - commentLength - 6); // 6 = 2 (Comment length) + 4 (Offset of start of central directory, relative to start of archive)
    fileChannel.read(zipCentralDirectoryStart);
    final long centralDirStartOffset = zipCentralDirectoryStart.getInt(0);
    return centralDirStartOffset;
}

From source file:Main.java

public static byte[] getAESiv(byte[] authKey, byte[] msgKey, boolean isOut) {
    int x = 0;/*from ww w . ja  v  a2  s.  c  o  m*/
    if (!isOut)
        x = 8;

    ByteBuffer tempA = ByteBuffer.allocate(msgKey.length + 32);
    tempA.put(msgKey);
    tempA.put(authKey, x, 32);
    byte[] a = getSHA1hash(tempA.array());

    ByteBuffer tempB = ByteBuffer.allocate(msgKey.length + 32);
    tempB.put(authKey, 32 + x, 16);
    tempB.put(msgKey);
    tempB.put(authKey, 48 + x, 16);
    byte[] b = getSHA1hash(tempB.array());

    ByteBuffer tempC = ByteBuffer.allocate(msgKey.length + 32);
    tempC.put(authKey, 64 + x, 32);
    tempC.put(msgKey);
    byte[] c = getSHA1hash(tempC.array());

    ByteBuffer tempD = ByteBuffer.allocate(msgKey.length + 32);
    tempD.put(msgKey);
    tempD.put(authKey, 96 + x, 32);
    byte[] d = getSHA1hash(tempD.array());

    ByteBuffer iv = ByteBuffer.allocate(12 + 8 + 4 + 8);
    iv.put(a, 8, 12);
    iv.put(b, 0, 8);
    iv.put(c, 16, 4);
    iv.put(d, 0, 8);

    return iv.array();
}

From source file:MainClass.java

public void run() {

    ByteBuffer sizeb = ByteBuffer.allocate(4);
    try {/*  w  w w  .ja v a 2  s .  c  om*/
        while (sizeb.hasRemaining())
            in.read(sizeb);
        sizeb.flip();
        int howMany = sizeb.getInt();
        sizeb.clear();

        for (int i = 0; i < howMany; i++) {
            while (sizeb.hasRemaining())
                in.read(sizeb);
            sizeb.flip();
            int length = sizeb.getInt();
            sizeb.clear();

            ByteBuffer data = ByteBuffer.allocate(length);
            while (data.hasRemaining())
                in.read(data);

            BigInteger result = new BigInteger(data.array());
            System.out.println(result);
        }
    } catch (IOException ex) {
        System.err.println(ex);
    } finally {
        try {
            in.close();
        } catch (Exception ex) {
            // We tried
        }
    }
}

From source file:Main.java

public static void readData(SeekableByteChannel seekableChannel, Charset cs) throws IOException {
    ByteBuffer byteBuffer = ByteBuffer.allocate(128);
    String encoding = System.getProperty("file.encoding");
    while (seekableChannel.read(byteBuffer) > 0) {
        byteBuffer.rewind();/*from  w ww.ja v  a  2s. c o m*/
        CharBuffer charBuffer = cs.decode(byteBuffer);
        System.out.print(charBuffer);
        byteBuffer.flip();
    }
}