Example usage for java.nio ByteBuffer allocate

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:Main.java

public static ByteBuffer createByteBufferOnHeap(final int size) {
    final ByteBuffer buf = ByteBuffer.allocate(size).order(ByteOrder.nativeOrder());
    buf.clear();//from   w ww  . j ava 2  s.c om
    return buf;
}

From source file:Main.java

public static String smallFileSha1(File file) {
    InputStream inputStream = null;
    try {/*  w w w  .  j  a va  2s  .  co  m*/
        MessageDigest md = MessageDigest.getInstance("SHA1");
        inputStream = new BufferedInputStream(new FileInputStream(file));
        byte[] buffer = new byte[1024];
        int nRead = 0;
        while ((nRead = inputStream.read(buffer)) != -1) {
            md.update(buffer, 0, nRead);
        }
        byte[] digest = md.digest();
        byte[] blockBytes = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(1).array();
        byte[] result = ByteBuffer.allocate(4 + digest.length).put(blockBytes, 0, 4)
                .put(digest, 0, digest.length).array();
        return Base64.encodeToString(result, Base64.URL_SAFE | Base64.NO_WRAP);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return null;
}

From source file:Main.java

public static IntBuffer createIntBufferOnHeap(final int size) {
    final IntBuffer buf = ByteBuffer.allocate(4 * size).order(ByteOrder.nativeOrder()).asIntBuffer();
    buf.clear();/*from   w w  w  . j  a v a2 s  .  c  o m*/
    return buf;
}

From source file:Main.java

public static FloatBuffer createFloatBufferOnHeap(final int size) {
    final FloatBuffer buf = ByteBuffer.allocate(4 * size).order(ByteOrder.nativeOrder()).asFloatBuffer();
    buf.clear();//  w w w.j a v  a 2s . c  o  m
    return buf;
}

From source file:Main.java

public static ShortBuffer createShortBufferOnHeap(final int size) {
    final ShortBuffer buf = ByteBuffer.allocate(2 * size).order(ByteOrder.nativeOrder()).asShortBuffer();
    buf.clear();//from  w w w  .  ja  v a2  s.  c  o  m
    return buf;
}

From source file:Main.java

public static DoubleBuffer createDoubleBufferOnHeap(final int size) {
    final DoubleBuffer buf = ByteBuffer.allocate(8 * size).order(ByteOrder.nativeOrder()).asDoubleBuffer();
    buf.clear();/*from   ww w .j  ava  2 s  .  c o m*/
    return buf;
}

From source file:Main.java

public static byte[] leIntToByteArray(int i) {
    final ByteBuffer bb = ByteBuffer.allocate(Integer.SIZE / Byte.SIZE);
    bb.order(ByteOrder.LITTLE_ENDIAN);
    bb.putInt(i);//from   w  w  w  . jav a  2s.co m
    return bb.array();
}

From source file:br.com.semanticwot.cd.discovery.infra.Hash.java

public static String hash(Object entity) {
    int hashCode = HashCodeBuilder.reflectionHashCode(entity);

    byte[] array = ByteBuffer.allocate(4).putInt(hashCode).array();

    String hash = Hex.encodeHexString(array);
    return hash;//from   w ww . j av  a2 s  .c om

}

From source file:Main.java

public static byte[] getAESkey(byte[] authKey, byte[] msgKey, boolean isOut) {
    int x = 0;/*from  w  ww .ja va 2  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 key = ByteBuffer.allocate(8 + 12 + 12);
    key.put(a, 0, 8);
    key.put(b, 8, 12);
    key.put(c, 4, 12);

    return key.array();
}

From source file:Main.java

/**
 * Convert the given int to a 4-byte array
 * /*from   w  w  w  . j a  v a2 s .co  m*/
 * @param i
 *            An 'int'
 * 
 * @return A 4-byte array in big endian (MSB) ordering
 */
public static byte[] convertIntToByteArrayBigEndian(int i) {
    return ByteBuffer.allocate(Integer.SIZE / EIGHT).putInt(i).array();
}