/*

 * Copyright (c) 2001, 2016, 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.

 *

 */

package sun.jvm.hotspot.runtime;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.utilities.PlatformInfo;

/** Encapsulates some byte-swapping operations defined in the VM */

public class Bytes {

  private boolean swap;

  public Bytes(MachineDescription machDesc) {

    swap = !machDesc.isBigEndian();

  }

  /** Should only swap if the hardware's underlying byte order is

      different from Java's */

  public short swapShort(short x) {

    if (!swap)

      return x;

    return (short) (((x >> 8) & 0xFF) | (x << 8));

  }

  /** Should only swap if the hardware's underlying byte order is

      different from Java's */

  public int swapInt(int x) {

    if (!swap)

      return x;

    return ((int)swapShort((short) x) << 16) | (swapShort((short) (x >> 16)) & 0xFFFF);

  }

  /** Should only swap if the hardware's underlying byte order is

      different from Java's */

  public long swapLong(long x) {

    if (!swap)

      return x;

    return ((long)swapInt((int) x) << 32) | (swapInt((int) (x >> 32)) & 0xFFFFFFFF);

  }

}