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
  10
  11
  12 #include "BaseLibInternals.h"
  13
  14 /**
  15   Switches the endianess of a 32-bit integer.
  16
  17   This function swaps the bytes in a 32-bit unsigned value to switch the value
  18   from little endian to big endian or vice versa. The byte swapped value is
  19   returned.
  20
  21   @param  Value A 32-bit unsigned value.
  22
  23   @return The byte swapped Value.
  24
  25 **/
  26 UINT32
  27 EFIAPI
  28 SwapBytes32 (
  29   IN      UINT32                    Value
  30   )
  31 {
  32   UINT32  LowerBytes;
  33   UINT32  HigherBytes;
  34
  35   LowerBytes  = (UINT32) SwapBytes16 ((UINT16) Value);
  36   HigherBytes = (UINT32) SwapBytes16 ((UINT16) (Value >> 16));
  37
  38   return (LowerBytes << 16 | HigherBytes);
  39 }