MdePkg/Library/BaseLib/SwapBytes32.c

   1 /** @file
   2   Math worker functions.
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "BaseLibInternals.h"
  16
  17 /**
  18   Switches the endianess of a 32-bit integer.
  19
  20   This function swaps the bytes in a 32-bit unsigned value to switch the value
  21   from little endian to big endian or vice versa. The byte swapped value is
  22   returned.
  23
  24   @param  Operand A 32-bit unsigned value.
  25
  26   @return The byte swaped Operand.
  27
  28 **/
  29 UINT32
  30 EFIAPI
  31 SwapBytes32 (
  32   IN      UINT32                    Operand
  33   )
  34 {
  35   return (UINT32)(
  36            ((UINT32)SwapBytes16 ((UINT16)Operand) << 16) |
  37            ((UINT32)SwapBytes16 ((UINT16)(Operand >> 16)))
  38            );
  39 }