Example usage for java.lang System arraycopy

Introduction

In this page you can find the example usage for java.lang System arraycopy.

Prototype

@HotSpotIntrinsicCandidate
public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length);

Source Link

Document

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

Usage

From source file:Main.java

public static byte[] concat(byte[] a, byte b) {
    int aLen = a.length;
    byte[] c = new byte[aLen + 1];
    System.arraycopy(a, 0, c, 0, aLen);
    c[aLen] = b;// w w  w .jav  a2s  . com
    return c;
}

From source file:Main.java

/**
 * Concatenate two byte arrays. No null checks are performed.
 *
 * @param x1 the first array/*from   w  w w .  jav a  2 s . c  om*/
 * @param x2 the second array
 * @return (x2||x1) (little-endian order, i.e. x1 is at lower memory
 *         addresses)
 */
public static byte[] concatenate(byte[] x1, byte[] x2) {
    byte[] result = new byte[x1.length + x2.length];

    System.arraycopy(x1, 0, result, 0, x1.length);
    System.arraycopy(x2, 0, result, x1.length, x2.length);

    return result;
}

From source file:Main.java

public static byte[] concat(byte[] first, byte[] second) {
    byte[] result = Arrays.copyOf(first, first.length + second.length);
    System.arraycopy(second, 0, result, first.length, second.length);
    return result;
}

From source file:Main.java

public static byte[] NV21toYUV420SemiPlanar(final byte[] input, final byte[] output, final int width,
        final int height) {
    /*/*from  ww  w.  j  a va 2  s  .  c  o  m*/
     * COLOR_FormatYUV420SemiPlanar is NV12
     * We convert by putting the corresponding U and V bytes together (interleaved).
     */
    final int frameSize = width * height;
    final int qFrameSize = frameSize / 4;

    System.arraycopy(input, 0, output, 0, frameSize); // Y

    for (int i = 0; i < qFrameSize; i++) {
        output[frameSize + i * 2] = input[frameSize + i * 2 + 1]; // Cb (U)
        output[frameSize + i * 2 + 1] = input[frameSize + i * 2]; // Cr (V)
    }
    return output;
}

From source file:Main.java

public static byte[] YV12toYUV420SemiPlanar(final byte[] input, final byte[] output, final int width,
        final int height) {
    /*/*from www . j  av a2 s . com*/
     * COLOR_FormatYUV420SemiPlanar is NV12
     * We convert by putting the corresponding U and V bytes together (interleaved).
     */
    final int frameSize = width * height;
    final int qFrameSize = frameSize / 4;

    System.arraycopy(input, 0, output, 0, frameSize); // Y

    for (int i = 0; i < qFrameSize; i++) {
        output[frameSize + i * 2] = input[frameSize + i + qFrameSize]; // Cb (U)
        output[frameSize + i * 2 + 1] = input[frameSize + i]; // Cr (V)
    }
    return output;
}

From source file:Main.java

public static String getNewString(String str) {
    byte[] data = str.getBytes();
    int index = data.length;
    for (int i = 0; i < data.length; i++) {
        if (data[i] < 48 || data[i] > 57) {
            index = i;// w  w w. j a va2 s.  c o m
            break;
        }
    }
    byte[] temp = new byte[index];
    System.arraycopy(data, 0, temp, 0, index);
    String res;
    try {
        res = new String(temp, "GBK");
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return "";
    }
    return res;
}

From source file:Main.java

public static <T> T[] join(T[] head, T[] tail) {
    if (head == null) {
        return tail;
    }/*from www  . ja v  a  2s.  c  om*/
    if (tail == null) {
        return head;
    }
    Class<?> type = head.getClass().getComponentType();
    T[] result = (T[]) Array.newInstance(type, head.length + tail.length);

    System.arraycopy(head, 0, result, 0, head.length);
    System.arraycopy(tail, 0, result, head.length, tail.length);

    return result;
}

From source file:Main.java

/**
 * Works with two arrays of the same class type.
 * /*ww  w  .ja  v  a2 s  .c o m*/
 * @param a
 * @param b
 * @return
 */
public static <T> T[] concatArrays(T[] a, T[] b) {
    final int alen = a.length;
    final int blen = b.length;
    @SuppressWarnings("unchecked")
    final T[] result = (T[]) java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), alen + blen);
    System.arraycopy(a, 0, result, 0, alen);
    System.arraycopy(b, 0, result, alen, blen);
    return result;
}

From source file:Main.java

private static byte[] generateKey(String strSrc) {

    MessageDigest digest;//from   w ww  .  ja v  a 2 s.c  o m

    byte[] keyBytes = new byte[32];
    try {
        digest = MessageDigest.getInstance("SHA-256");
        digest.update(strSrc.getBytes("UTF-8"));
        System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    return keyBytes;
}

From source file:Main.java

/**
 * Return a clone of the given byte array (performs null check beforehand).
 *
 * @param array the array to clone/*ww  w. j  a v  a2s .  co m*/
 * @return the clone of the given array, or <tt>null</tt> if the array is
 *         <tt>null</tt>
 */
public static byte[] clone(byte[] array) {
    if (array == null) {
        return null;
    }
    byte[] result = new byte[array.length];
    System.arraycopy(array, 0, result, 0, array.length);
    return result;
}