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:io.datenwelt.cargo.rest.utils.Strings.java

public static String token() {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES * 100);
    for (int i = 0; i < 100; i++) {
        buffer.putLong(random.nextLong());
    }/*  ww  w .j av a  2  s .  c  o m*/
    return DigestUtils.md5Hex(buffer.array());
}

From source file:Main.java

public static IntBuffer createIntBufferOnHeap(final int size) {
    final IntBuffer buf = ByteBuffer.allocate(SIZEOF_FLOAT * size).order(ByteOrder.nativeOrder()).asIntBuffer();
    buf.clear();//w w  w  .j  a  va  2 s.  com
    return buf;
}

From source file:Main.java

/**
 * Convert the given long to an 8-byte array
 * /*www. j a  v  a  2 s .  c o m*/
 * @param l
 *            A 'long'
 * 
 * @return An 8-byte array in big endian (MSB) ordering
 */
public static byte[] convertLongToByteArrayBigEndian(long l) {
    return ByteBuffer.allocate(Long.SIZE / EIGHT).putLong(l).array();
}

From source file:Main.java

public static byte intToByte(final int value) {
    return ByteBuffer.allocate(4).putInt(value).array()[3];
}

From source file:Main.java

public static FloatBuffer createFloatBufferOnHeap(final int size) {
    final FloatBuffer buf = ByteBuffer.allocate(SIZEOF_FLOAT * size).order(ByteOrder.nativeOrder())
            .asFloatBuffer();/*  w  ww .ja v a2  s . c o  m*/
    buf.clear();
    return buf;
}

From source file:Main.java

public static DoubleBuffer createDoubleBufferOnHeap(final int size) {
    final DoubleBuffer buf = ByteBuffer.allocate(SIZEOF_DOUBLE * size).order(ByteOrder.nativeOrder())
            .asDoubleBuffer();/*from  www  .  java 2 s .  c  o m*/
    buf.clear();
    return buf;
}

From source file:Main.java

public static ByteBuffer copy(ByteBuffer buffer) {

    final int length = buffer.limit() - buffer.position();
    final ByteOrder o = buffer.order();
    final ByteBuffer r = ByteBuffer.allocate(length);
    r.order(o);//from   w w w  . java2 s . co m

    r.put(buffer);
    r.clear(); // Reset position and limit after the put()

    return r;

}

From source file:Main.java

public static byte[] int2bytes(int a) {
    int arraySize = Integer.SIZE / Byte.SIZE;
    ByteBuffer buffer = ByteBuffer.allocate(arraySize);
    buffer.order(ByteOrder.LITTLE_ENDIAN);
    return buffer.putInt(a).array();
}

From source file:Main.java

static byte[] intToByteArray(int i) {
    return ByteBuffer.allocate(4).putInt(i).array();
}

From source file:Main.java

public static byte[] padRight(byte[] tgt, int len, byte padding) {
    if (tgt.length >= len) {
        return tgt;
    }/*from w  w w  . jav a2s .  c  o m*/
    byte[] paddings = new byte[len - tgt.length];
    Arrays.fill(paddings, padding);
    ByteBuffer buffer = ByteBuffer.allocate(len);

    buffer.put(tgt);
    buffer.put(paddings);

    return buffer.array();
}