/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @summary Verifies behaviour of Unsafe.copyMemory

 * @library /testlibrary

 * @run main CopyMemory

 */

import com.oracle.java.testlibrary.*;

import sun.misc.Unsafe;

import static com.oracle.java.testlibrary.Asserts.*;

public class CopyMemory {

    final static int LENGTH = 8;

    public static void main(String args[]) throws Exception {

        Unsafe unsafe = Utils.getUnsafe();

        long src = unsafe.allocateMemory(LENGTH);

        long dst = unsafe.allocateMemory(LENGTH);

        assertNotEquals(src, 0L);

        assertNotEquals(dst, 0L);

        // call copyMemory() with different lengths and verify the contents of

        // the destination array

        for (int i = 0; i < LENGTH; i++) {

            unsafe.putByte(src + i, (byte)i);

            unsafe.copyMemory(src, dst, i);

            for (int j = 0; j < i; j++) {

                assertEquals(unsafe.getByte(src + j), unsafe.getByte(src + j));

            }

        }

        unsafe.freeMemory(src);

        unsafe.freeMemory(dst);

    }

}