EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/SwapBytes32.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   SwapBytes32.c
  16
  17 Abstract:
  18
  19   Math worker functions.
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 /**
  26   Switches the endianess of a 32-bit integer.
  27
  28   This function swaps the bytes in a 32-bit unsigned value to switch the value
  29   from little endian to big endian or vice versa. The byte swapped value is
  30   returned.
  31
  32   @param  Operand A 32-bit unsigned value.
  33
  34   @return The byte swaped Operand.
  35
  36 **/
  37 UINT32
  38 EFIAPI
  39 SwapBytes32 (
  40   IN      UINT32                    Operand
  41   )
  42 {
  43   UINT32  LowerBytes;
  44   UINT32  HigherBytes;
  45
  46   LowerBytes  = (UINT32) SwapBytes16 ((UINT16) Operand);
  47   HigherBytes = (UINT32) SwapBytes16 ((UINT16) (Operand >> 16));
  48
  49   return (LowerBytes << 16 | HigherBytes);
  50 }