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

/**
 * Expands an array of floats to double its current size.
 *
 * @param f Array to be expanded./*from   w  w w  .ja  va 2  s  .co m*/
 * @return Array of floats with f.length*2 length. 
 */
static public float[] resizeArrayFloat(float[] f, int newSize) {
    float[] newf = new float[newSize];
    System.arraycopy(f, 0, newf, 0, Math.min(f.length, newSize));
    return newf;
}

From source file:Main.java

public static byte[] newByteArrayWithDateInfo(int second, byte[] data2) {
    byte[] data1 = createDateInfo(second).getBytes();
    byte[] retdata = new byte[data1.length + data2.length];
    System.arraycopy(data1, 0, retdata, 0, data1.length);
    System.arraycopy(data2, 0, retdata, data1.length, data2.length);
    return retdata;
}

From source file:Main.java

/**
 * @comment_sp Agrega XMLNamespace// ww w  .  ja v  a 2s.com
 * @comment_ko addXMLNamespace
 * @param source
 * @param xmlNamespace
 * @return
 */
public static byte[] addXMLNamespace(byte source[], String xmlNamespace) {
    byte oldContent[] = new byte[source.length];
    System.arraycopy(source, 0, oldContent, 0, source.length);
    String s = new String(oldContent);
    String inputNamespace = " xmlns=\"" + xmlNamespace + "\"";
    int start = s.indexOf("?>");
    int fromIndex = s.indexOf("<", start);
    int toIndex = s.indexOf(">", fromIndex);
    StringBuffer sb = new StringBuffer(s);
    sb.insert(toIndex, inputNamespace);
    String input = new String(sb);
    return input.getBytes();
}

From source file:Main.java

public static void flatten_3D_vector(float[][][] src_vec, float[] target_vec) {
    int depth = src_vec.length;
    int height = src_vec[0].length;
    int width = src_vec[0][0].length;
    for (int i = 0; i < depth; i++) {
        for (int j = 0; j < height; j++) {
            System.arraycopy(src_vec[i][j], 0, target_vec, (i * height + j) * width, width);
        }// w w w .j av a 2s .  c  om
    }
}

From source file:Main.java

public static byte[] copyOfRange(byte[] data, int from, int to) {
    int newLength = getLength(from, to);

    byte[] tmp = new byte[newLength];

    if (data.length - from < newLength) {
        System.arraycopy(data, from, tmp, 0, data.length - from);
    } else {/*from ww w  .j  ava2s . com*/
        System.arraycopy(data, from, tmp, 0, newLength);
    }

    return tmp;
}

From source file:Main.java

public static byte[] TriDesDecryption(byte[] byteKey, byte[] dec) {
    try {/*from  w  w w  .  jav  a  2s .  c o  m*/
        byte[] en_key = new byte[24];
        if (byteKey.length == 16) {
            System.arraycopy(byteKey, 0, en_key, 0, 16);
            System.arraycopy(byteKey, 0, en_key, 16, 8);
        }
        SecretKey key = new SecretKeySpec(en_key, "DESede");
        Cipher dcipher = Cipher.getInstance("DESede/ECB/NoPadding");
        dcipher.init(Cipher.DECRYPT_MODE, key);

        byte[] de_b = dcipher.doFinal(dec);

        return de_b;
    } catch (Exception e) {
        e.printStackTrace();

    }
    return null;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> T[] addToArray(T[] array1, T[] array2) {

    Class<?> componentType = array1.getClass().getComponentType();

    final Object newArray = Array.newInstance(componentType, array1.length + array2.length);

    System.arraycopy(array1, 0, newArray, 0, array1.length);
    System.arraycopy(array2, 0, newArray, array1.length, array2.length);

    return (T[]) newArray;
}

From source file:Main.java

public static byte[] concatenate(byte[] a, byte[] b) {
    if (a != null && b != null) {
        byte[] rv = new byte[a.length + b.length];

        System.arraycopy(a, 0, rv, 0, a.length);
        System.arraycopy(b, 0, rv, a.length, b.length);

        return rv;
    } else if (b != null) {
        return clone(b);
    } else {/*from w  w w  .j ava2  s. co m*/
        return clone(a);
    }
}

From source file:Main.java

public static <T> T[] ensureMinLength(T[] array, int length) {

    if (array.length >= length) {
        return array;
    }//from   w  w  w  .ja  v  a2s . co m

    T[] newArray = (T[]) Array.newInstance(array.getClass().getComponentType(), length);
    if (array.length > 0) {
        System.arraycopy(array, 0, newArray, 0, Math.min(array.length, length));
    }
    return newArray;
}

From source file:Main.java

public static double[] padWithZeros(double[] input, int len, double[] output) {
    if (len <= input.length) {
        return input;
    } else {/*from  w ww.  j a  v  a 2s.c o m*/
        if (output == null || output.length != len) {
            output = new double[len];
        }
        System.arraycopy(input, 0, output, 0, input.length);
        Arrays.fill(output, input.length, output.length, 0);
        return output;
    }
}