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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 <stdint.h>
  39.  
  40. #if !(defined(__BE__) ^ defined(__LE__))
  41.     #error The architecture must be either big-endian or little-endian.
  42. #endif
  43.  
  44. #ifdef __BE__
  45.  
  46. #define uint16_t_le2host(n)  (uint16_t_byteorder_swap(n))
  47. #define uint32_t_le2host(n)  (uint32_t_byteorder_swap(n))
  48. #define uint64_t_le2host(n)  (uint64_t_byteorder_swap(n))
  49.  
  50. #define uint16_t_be2host(n)  (n)
  51. #define uint32_t_be2host(n)  (n)
  52. #define uint64_t_be2host(n)  (n)
  53.  
  54. #define host2uint16_t_le(n)  (uint16_t_byteorder_swap(n))
  55. #define host2uint32_t_le(n)  (uint32_t_byteorder_swap(n))
  56. #define host2uint64_t_le(n)  (uint64_t_byteorder_swap(n))
  57.  
  58. #define host2uint16_t_be(n)  (n)
  59. #define host2uint32_t_be(n)  (n)
  60. #define host2uint64_t_be(n)  (n)
  61.  
  62. #else
  63.  
  64. #define uint16_t_le2host(n)  (n)
  65. #define uint32_t_le2host(n)  (n)
  66. #define uint64_t_le2host(n)  (n)
  67.  
  68. #define uint16_t_be2host(n)  (uint16_t_byteorder_swap(n))
  69. #define uint32_t_be2host(n)  (uint32_t_byteorder_swap(n))
  70. #define uint64_t_be2host(n)  (uint64_t_byteorder_swap(n))
  71.  
  72. #define host2uint16_t_le(n)  (n)
  73. #define host2uint32_t_le(n)  (n)
  74. #define host2uint64_t_le(n)  (n)
  75.  
  76. #define host2uint16_t_be(n)  (uint16_t_byteorder_swap(n))
  77. #define host2uint32_t_be(n)  (uint32_t_byteorder_swap(n))
  78. #define host2uint64_t_be(n)  (uint64_t_byteorder_swap(n))
  79.  
  80. #endif
  81.  
  82. static inline uint64_t uint64_t_byteorder_swap(uint64_t n)
  83. {
  84.     return ((n & 0xff) << 56) |
  85.         ((n & 0xff00) << 40) |
  86.         ((n & 0xff0000) << 24) |
  87.         ((n & 0xff000000LL) << 8) |
  88.         ((n & 0xff00000000LL) >> 8) |
  89.         ((n & 0xff0000000000LL) >> 24) |
  90.         ((n & 0xff000000000000LL) >> 40) |
  91.         ((n & 0xff00000000000000LL) >> 56);
  92. }
  93.  
  94. static inline uint32_t uint32_t_byteorder_swap(uint32_t n)
  95. {
  96.     return ((n & 0xff) << 24) |
  97.         ((n & 0xff00) << 8) |
  98.         ((n & 0xff0000) >> 8) |
  99.         ((n & 0xff000000) >> 24);
  100. }
  101.  
  102. static inline uint16_t uint16_t_byteorder_swap(uint16_t n)
  103. {
  104.     return ((n & 0xff) << 8) |
  105.         ((n & 0xff00) >> 8);
  106. }
  107.  
  108. #endif
  109.  
  110. /** @}
  111.  */
  112.