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 byte[] bitmapToArray(Bitmap b) {
    int bytes = b.getByteCount();

    ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
    b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer

    byte[] array = buffer.array(); //Get the underlying array containing the data.

    return array;
}

From source file:Main.java

public static byte[] getBytes(Bitmap bitmap) {
    int byteCount = bitmap.getByteCount();
    ByteBuffer buffer = ByteBuffer.allocate(byteCount);
    bitmap.copyPixelsToBuffer(buffer);//w  w w.j  a  v  a2 s  .  c  o  m
    buffer.rewind();

    byte[] data = new byte[byteCount];
    buffer.get(data);
    return data;
}

From source file:Main.java

/**
 * Converts an int value into an array of 4 bytes.
 *
 * @param x The int.//from ww w .  ja  v a2  s  .  c om
 * @return The bytes.
 */
public static byte[] intToBytes(final int x) {
    final ByteBuffer buffer = ByteBuffer.allocate(4);
    buffer.putInt(x);
    return buffer.array();
}

From source file:Main.java

public static byte[] randomUUID() {
    UUID uuid = UUID.randomUUID();
    long hi = uuid.getMostSignificantBits();
    long lo = uuid.getLeastSignificantBits();
    return ByteBuffer.allocate(16).putLong(hi).putLong(lo).array();
}

From source file:Main.java

/**
 * Converts an array of 4 bytes into a int.
 *
 * @param bytes The bytes./*from w  ww  .  j  a  v  a2s .c om*/
 * @return The int.
 */
public static int bytesToInt(final byte[] bytes) {
    final ByteBuffer buffer = ByteBuffer.allocate(4);
    buffer.put(bytes, 0, 4);
    buffer.flip();
    return buffer.getInt();
}

From source file:Main.java

public static byte[] addHeader(byte[] data) {
    byte[] h264 = new byte[data.length + 4];
    for (int i = 0; i < data.length; i++) {
        h264[i + 4] = data[i];/*from  w  ww  .ja v  a2  s.c  o  m*/
    }
    byte[] lens = ByteBuffer.allocate(4).putInt(data.length).array();
    h264[0] = lens[0];
    h264[1] = lens[1];
    h264[2] = lens[2];
    h264[3] = lens[3];
    return h264;
}

From source file:Main.java

/**
 * Converts an array of 8 bytes into a long.
 *
 * @param bytes The bytes.// www .  j av  a 2  s.  c  om
 * @return The long.
 */
public static long bytesToLong(final byte[] bytes) {
    final ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.put(bytes, 0, 8);
    buffer.flip();
    return buffer.getLong();
}

From source file:Main.java

public static byte[] indexValueForObject(Object obj) {

    byte[] bytes = null;

    if (obj instanceof Double) {

        double d = (Double) obj;
        bytes = ByteBuffer.allocate(4).putDouble(d).array();

        bytes[0] ^= 0xff;/*  w w w . j  ava  2 s . com*/

        if (d < 0) {
            bytes[1] ^= 0xff;
            bytes[2] ^= 0xff;
            bytes[3] ^= 0xff;
        }
    }

    else if (obj instanceof Integer) {

        // flip sign bit
        int i = (Integer) obj;

        i ^= 0x80000000;

        bytes = ByteBuffer.allocate(4).putInt(i).array();
    }

    else if (obj instanceof String) {

        bytes = ((String) obj).getBytes();
    }

    return bytes;
}

From source file:Main.java

public static byte[] bitmapToByteArray(Bitmap bitmap) {
    //int numBytes = bitmap.getWidth() + bitmap.getHeight() * 4;
    int numBytes = bitmap.getByteCount();
    ByteBuffer byteBuffer = ByteBuffer.allocate(numBytes);
    bitmap.copyPixelsToBuffer(byteBuffer);
    return byteBuffer.array();
}

From source file:Main.java

public static byte[] getDHdataWithHash(byte[] hash, byte[] data) {
    int ost = (data.length + 20) % 16 > 0 ? 16 : 0;
    int size = ((20 + data.length) / 16) * 16 + ost;

    ByteBuffer buffer = ByteBuffer.allocate(size);
    buffer.put(hash);/*from  w ww .  ja v a2  s.c  o m*/
    buffer.put(data);

    byte[] rand = new byte[size - hash.length - data.length];
    new Random().nextBytes(rand);
    buffer.put(rand);
    return buffer.array();
}