MdePkg/Library/BaseLib/SwapBytes32.c

   1 /** @file
   2   Math worker functions.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Switches the endianess of a 32-bit integer.
  13
  14   This function swaps the bytes in a 32-bit unsigned value to switch the value
  15   from little endian to big endian or vice versa. The byte swapped value is
  16   returned.
  17
  18   @param  Value A 32-bit unsigned value.
  19
  20   @return The byte swapped Value.
  21
  22 **/
  23 UINT32
  24 EFIAPI
  25 SwapBytes32 (
  26   IN      UINT32  Value
  27   )
  28 {
  29   UINT32  LowerBytes;
  30   UINT32  HigherBytes;
  31
  32   LowerBytes  = (UINT32)SwapBytes16 ((UINT16)Value);
  33   HigherBytes = (UINT32)SwapBytes16 ((UINT16)(Value >> 16));
  34
  35   return (LowerBytes << 16 | HigherBytes);
  36 }