StdLib/LibC/Main/ByteSwap.c

   1 /** @file
   2   Byte Swap routines for endian-nes conversions.
   3
   4   Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   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 #include  <Library/BaseLib.h>
  14 #include  <LibConfig.h>
  15
  16 #include <sys/bswap.h>
  17
  18 // Undefine macro versions of the functions to be defined below.
  19 #undef  bswap16
  20 #undef  bswap32
  21 #undef  bswap64
  22
  23 /**
  24 Switches the endianness of a 16-bit integer.
  25
  26 This function swaps the bytes in a 16-bit unsigned value to switch the value
  27 from little endian to big endian or vice versa. The byte swapped value is
  28 returned.
  29
  30 @param  Value     A 16-bit unsigned value.
  31
  32 @return The byte swapped Value.
  33
  34 **/
  35 uint16_t bswap16(uint16_t Value)
  36 {
  37   return SwapBytes16(Value);
  38 }
  39
  40 /**
  41 Switches the endianness of a 32-bit integer.
  42
  43 This function swaps the bytes in a 32-bit unsigned value to switch the value
  44 from little endian to big endian or vice versa. The byte swapped value is
  45 returned.
  46
  47 @param  Value A 32-bit unsigned value.
  48
  49 @return The byte swapped Value.
  50
  51 **/
  52 uint32_t bswap32(uint32_t Value)
  53 {
  54   return SwapBytes32(Value);
  55 }
  56
  57 /**
  58 Switches the endianness of a 64-bit integer.
  59
  60 This function swaps the bytes in a 64-bit unsigned value to switch the value
  61 from little endian to big endian or vice versa. The byte swapped value is
  62 returned.
  63
  64 @param  Value A 64-bit unsigned value.
  65
  66 @return The byte swapped Value.
  67
  68 **/
  69 uint64_t bswap64(uint64_t Value)
  70 {
  71   return SwapBytes64(Value);
  72 }