src/common/compat/endian.h

   1 /*
   2  * Copyright (C) 2011 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 /*
   9  * This compat header provides the following defines:
  10  *
  11  *  LITTLE_ENDIAN
  12  *  BIG_ENDIAN
  13  *  BYTE_ORDER
  14  *
  15  * And functions / macros :
  16  *
  17  *  bswap_16()
  18  *  bswap_32()
  19  *  bswap_64()
  20  *
  21  *  htobe16()
  22  *  htole16()
  23  *  be16toh()
  24  *  le16toh()
  25  *
  26  *  htobe32()
  27  *  htole32()
  28  *  be32toh()
  29  *  le32toh()
  30  *
  31  *  htobe64()
  32  *  htole64()
  33  *  be64toh()
  34  *  le64toh()
  35  */
  36
  37 #ifndef _COMPAT_ENDIAN_H
  38 #define _COMPAT_ENDIAN_H
  39
  40 #if defined(__linux__) || defined(__CYGWIN__)
  41 #include <endian.h>
  42
  43 /*
  44  * htobe/betoh are not defined for glibc <2.9, so add them
  45  * explicitly if they are missing.
  46  */
  47 #ifdef __USE_BSD
  48 /* Conversion interfaces. */
  49 # include <byteswap.h>
  50
  51 # if __BYTE_ORDER == __LITTLE_ENDIAN
  52 #  ifndef htobe16
  53 #   define htobe16(x) __bswap_16(x)
  54 #  endif
  55 #  ifndef htole16
  56 #   define htole16(x) (x)
  57 #  endif
  58 #  ifndef be16toh
  59 #   define be16toh(x) __bswap_16(x)
  60 #  endif
  61 #  ifndef le16toh
  62 #   define le16toh(x) (x)
  63 #  endif
  64
  65 #  ifndef htobe32
  66 #   define htobe32(x) __bswap_32(x)
  67 #  endif
  68 #  ifndef htole32
  69 #   define htole32(x) (x)
  70 #  endif
  71 #  ifndef be32toh
  72 #   define be32toh(x) __bswap_32(x)
  73 #  endif
  74 #  ifndef le32toh
  75 #   define le32toh(x) (x)
  76 #  endif
  77
  78 #  ifndef htobe64
  79 #   define htobe64(x) __bswap_64(x)
  80 #  endif
  81 #  ifndef htole64
  82 #   define htole64(x) (x)
  83 #  endif
  84 #  ifndef be64toh
  85 #   define be64toh(x) __bswap_64(x)
  86 #  endif
  87 #  ifndef le64toh
  88 #   define le64toh(x) (x)
  89 #  endif
  90
  91 # else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  92 #  ifndef htobe16
  93 #   define htobe16(x) (x)
  94 #  endif
  95 #  ifndef htole16
  96 #   define htole16(x) __bswap_16(x)
  97 #  endif
  98 #  ifndef be16toh
  99 #   define be16toh(x) (x)
 100 #  endif
 101 #  ifndef le16toh
 102 #   define le16toh(x) __bswap_16(x)
 103 #  endif
 104
 105 #  ifndef htobe32
 106 #   define htobe32(x) (x)
 107 #  endif
 108 #  ifndef htole32
 109 #   define htole32(x) __bswap_32(x)
 110 #  endif
 111 #  ifndef be32toh
 112 #   define be32toh(x) (x)
 113 #  endif
 114 #  ifndef le32toh
 115 #   define le32toh(x) __bswap_32(x)
 116 #  endif
 117
 118 #  ifndef htobe64
 119 #   define htobe64(x) (x)
 120 #  endif
 121 #  ifndef htole64
 122 #   define htole64(x) __bswap_64(x)
 123 #  endif
 124 #  ifndef be64toh
 125 #   define be64toh(x) (x)
 126 #  endif
 127 #  ifndef le64toh
 128 #   define le64toh(x) __bswap_64(x)
 129 #  endif
 130
 131 # endif /* __BYTE_ORDER == __LITTLE_ENDIAN */
 132 #endif /* __USE_BSD */
 133
 134 #elif defined(__FreeBSD__)
 135 #include <machine/endian.h>
 136
 137 #elif defined(__sun__)
 138 #include <sys/byteorder.h>
 139 #ifndef __BIG_ENDIAN
 140 #define __BIG_ENDIAN 4321
 141 #endif /* __BIG_ENDIAN */
 142 #ifndef __LITTLE_ENDIAN
 143 #define __LITTLE_ENDIAN 1234
 144 #endif /* __LITTLE_ENDIAN */
 145
 146 #ifdef _LITTLE_ENDIAN
 147 #define __BYTE_ORDER __LITTLE_ENDIAN
 148 #endif /* _LITTLE_ENDIAN */
 149 #ifdef _BIG_ENDIAN
 150 #define __BYTE_ORDER __BIG_ENDIAN
 151 #endif /* _BIG_ENDIAN */
 152
 153 #define LITTLE_ENDIAN  __LITTLE_ENDIAN
 154 #define BIG_ENDIAN     __BIG_ENDIAN
 155 #define BYTE_ORDER     __BYTE_ORDER
 156
 157 #define betoh16(x) BE_16(x)
 158 #define letoh16(x) LE_16(x)
 159 #define betoh32(x) BE_32(x)
 160 #define letoh32(x) LE_32(x)
 161 #define betoh64(x) BE_64(x)
 162 #define letoh64(x) LE_64(x)
 163 #define htobe16(x) BE_16(x)
 164 #define be16toh(x) BE_16(x)
 165 #define htobe32(x) BE_32(x)
 166 #define be32toh(x) BE_32(x)
 167 #define htobe64(x) BE_64(x)
 168 #define be64toh(x) BE_64(x)
 169
 170 #elif defined(__APPLE__)
 171 # include <machine/endian.h>
 172 # include <libkern/OSByteOrder.h>
 173
 174 # if BYTE_ORDER == LITTLE_ENDIAN
 175 #  define htobe16(x) OSSwapConstInt16(x)
 176 #  define htole16(x) (x)
 177 #  define be16toh(x) OSSwapConstInt16(x)
 178 #  define le16toh(x) (x)
 179
 180 #  define htobe32(x) OSSwapConstInt32(x)
 181 #  define htole32(x) (x)
 182 #  define be32toh(x) OSSwapConstInt32(x)
 183 #  define le32toh(x) (x)
 184
 185 #  define htobe64(x) OSSwapConstInt64(x)
 186 #  define htole64(x) (x)
 187 #  define be64toh(x) OSSwapConstInt64(x)
 188 #  define le64toh(x) (x)
 189
 190 # else /* BYTE_ORDER == LITTLE_ENDIAN */
 191 #  define htobe16(x) (x)
 192 #  define htole16(x) OSSwapConstInt16(x)
 193 #  define be16toh(x) (x)
 194 #  define le16toh(x) OSSwapConstInt16(x)
 195
 196 #  define htobe32(x) (x)
 197 #  define htole32(x) OSSwapConstInt32(x)
 198 #  define be32toh(x) (x)
 199 #  define le32toh(x) OSSwapConstInt32(x)
 200
 201 #  define htobe64(x) (x)
 202 #  define htole64(x) OSSwapConstInt64(x)
 203 #  define be64toh(x) (x)
 204 #  define le64toh(x) OSSwapConstInt64(x)
 205 # endif
 206
 207 #else
 208 #error "Please add support for your OS."
 209 #endif
 210
 211 #endif /* _COMPAT_ENDIAN_H */