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  1. /*
  2.  * Copyright (c) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef LIBC_BYTEORDER_H_
  36. #define LIBC_BYTEORDER_H_
  37.  
  38. #include <libarch/byteorder.h>
  39. #include <stdint.h>
  40.  
  41. #if !(defined(ARCH_IS_BIG_ENDIAN) ^ defined(ARCH_IS_LITTLE_ENDIAN))
  42. #error The architecture must be either big-endian or little-endian.
  43. #endif
  44.  
  45. #ifdef ARCH_IS_BIG_ENDIAN
  46.  
  47. #define uint16_t_le2host(n)     uint16_t_byteorder_swap(n)
  48. #define uint32_t_le2host(n)     uint32_t_byteorder_swap(n)
  49. #define uint64_t_le2host(n)     uint64_t_byteorder_swap(n)
  50.  
  51. #define uint16_t_be2host(n)     (n)
  52. #define uint32_t_be2host(n)     (n)
  53. #define uint64_t_be2host(n)     (n)
  54.  
  55. #else
  56.  
  57. #define uint16_t_le2host(n)     (n)
  58. #define uint32_t_le2host(n)     (n)
  59. #define uint64_t_le2host(n)     (n)
  60.  
  61. #define uint16_t_be2host(n)     uint16_t_byteorder_swap(n)
  62. #define uint32_t_be2host(n)     uint32_t_byteorder_swap(n)
  63. #define uint64_t_be2host(n)     uint64_t_byteorder_swap(n)
  64.  
  65. #endif
  66.  
  67. static inline uint64_t uint64_t_byteorder_swap(uint64_t n)
  68. {
  69.     return ((n & 0xff) << 56) |
  70.         ((n & 0xff00) << 40) |
  71.         ((n & 0xff0000) << 24) |
  72.         ((n & 0xff000000LL) << 8) |
  73.         ((n & 0xff00000000LL) >> 8) |
  74.         ((n & 0xff0000000000LL) >> 24) |
  75.         ((n & 0xff000000000000LL) >> 40) |
  76.         ((n & 0xff00000000000000LL) >> 56);
  77. }
  78.  
  79. static inline uint32_t uint32_t_byteorder_swap(uint32_t n)
  80. {
  81.     return ((n & 0xff) << 24) |
  82.         ((n & 0xff00) << 8) |
  83.         ((n & 0xff0000) >> 8) |
  84.         ((n & 0xff000000) >> 24);
  85. }
  86.  
  87. static inline uint16_t uint16_t_byteorder_swap(uint16_t n)
  88. {
  89.     return ((n & 0xff) << 8) |
  90.         ((n & 0xff00) >> 8);
  91. }
  92.  
  93. #endif
  94.  
  95. /** @}
  96.  */
  97.