src/common/compat/endian.hpp

   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 <byteswap.h>
  42 #include <endian.h>
  43
  44 /*
  45  * htobe/betoh are not defined for glibc <2.9, so add them
  46  * explicitly if they are missing.
  47  */
  48 #ifdef __USE_BSD
  49 /* Conversion interfaces. */
  50 #include <byteswap.h>
  51
  52 #if __BYTE_ORDER == __LITTLE_ENDIAN
  53 #ifndef htobe16
  54 #define htobe16(x) __bswap_16(x)
  55 #endif
  56 #ifndef htole16
  57 #define htole16(x) (x)
  58 #endif
  59 #ifndef be16toh
  60 #define be16toh(x) __bswap_16(x)
  61 #endif
  62 #ifndef le16toh
  63 #define le16toh(x) (x)
  64 #endif
  65
  66 #ifndef htobe32
  67 #define htobe32(x) __bswap_32(x)
  68 #endif
  69 #ifndef htole32
  70 #define htole32(x) (x)
  71 #endif
  72 #ifndef be32toh
  73 #define be32toh(x) __bswap_32(x)
  74 #endif
  75 #ifndef le32toh
  76 #define le32toh(x) (x)
  77 #endif
  78
  79 #ifndef htobe64
  80 #define htobe64(x) __bswap_64(x)
  81 #endif
  82 #ifndef htole64
  83 #define htole64(x) (x)
  84 #endif
  85 #ifndef be64toh
  86 #define be64toh(x) __bswap_64(x)
  87 #endif
  88 #ifndef le64toh
  89 #define le64toh(x) (x)
  90 #endif
  91
  92 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
  93 #ifndef htobe16
  94 #define htobe16(x) (x)
  95 #endif
  96 #ifndef htole16
  97 #define htole16(x) __bswap_16(x)
  98 #endif
  99 #ifndef be16toh
 100 #define be16toh(x) (x)
 101 #endif
 102 #ifndef le16toh
 103 #define le16toh(x) __bswap_16(x)
 104 #endif
 105
 106 #ifndef htobe32
 107 #define htobe32(x) (x)
 108 #endif
 109 #ifndef htole32
 110 #define htole32(x) __bswap_32(x)
 111 #endif
 112 #ifndef be32toh
 113 #define be32toh(x) (x)
 114 #endif
 115 #ifndef le32toh
 116 #define le32toh(x) __bswap_32(x)
 117 #endif
 118
 119 #ifndef htobe64
 120 #define htobe64(x) (x)
 121 #endif
 122 #ifndef htole64
 123 #define htole64(x) __bswap_64(x)
 124 #endif
 125 #ifndef be64toh
 126 #define be64toh(x) (x)
 127 #endif
 128 #ifndef le64toh
 129 #define le64toh(x) __bswap_64(x)
 130 #endif
 131
 132 #endif /* __BYTE_ORDER == __LITTLE_ENDIAN */
 133 #endif /* __USE_BSD */
 134
 135 #elif defined(__FreeBSD__)
 136 #include <sys/endian.h>
 137
 138 #define bswap_16(x) bswap16(x)
 139 #define bswap_32(x) bswap32(x)
 140 #define bswap_64(x) bswap64(x)
 141
 142 #elif defined(__sun__)
 143 #include <sys/byteorder.h>
 144 #ifndef __BIG_ENDIAN
 145 #define __BIG_ENDIAN 4321
 146 #endif /* __BIG_ENDIAN */
 147 #ifndef __LITTLE_ENDIAN
 148 #define __LITTLE_ENDIAN 1234
 149 #endif /* __LITTLE_ENDIAN */
 150
 151 #ifdef _LITTLE_ENDIAN
 152 #define __BYTE_ORDER __LITTLE_ENDIAN
 153 #endif /* _LITTLE_ENDIAN */
 154 #ifdef _BIG_ENDIAN
 155 #define __BYTE_ORDER __BIG_ENDIAN
 156 #endif /* _BIG_ENDIAN */
 157
 158 #define LITTLE_ENDIAN __LITTLE_ENDIAN
 159 #define BIG_ENDIAN    __BIG_ENDIAN
 160 #define BYTE_ORDER    __BYTE_ORDER
 161
 162 #define betoh16(x) BE_16(x)
 163 #define letoh16(x) LE_16(x)
 164 #define betoh32(x) BE_32(x)
 165 #define letoh32(x) LE_32(x)
 166 #define betoh64(x) BE_64(x)
 167 #define letoh64(x) LE_64(x)
 168 #define htobe16(x) BE_16(x)
 169 #define be16toh(x) BE_16(x)
 170 #define htobe32(x) BE_32(x)
 171 #define be32toh(x) BE_32(x)
 172 #define htobe64(x) BE_64(x)
 173 #define be64toh(x) BE_64(x)
 174
 175 #elif defined(__APPLE__)
 176 #include <libkern/OSByteOrder.h>
 177 #include <machine/endian.h>
 178
 179 #if BYTE_ORDER == LITTLE_ENDIAN
 180 #define htobe16(x) OSSwapConstInt16(x)
 181 #define htole16(x) (x)
 182 #define be16toh(x) OSSwapConstInt16(x)
 183 #define le16toh(x) (x)
 184
 185 #define htobe32(x) OSSwapConstInt32(x)
 186 #define htole32(x) (x)
 187 #define be32toh(x) OSSwapConstInt32(x)
 188 #define le32toh(x) (x)
 189
 190 #define htobe64(x) OSSwapConstInt64(x)
 191 #define htole64(x) (x)
 192 #define be64toh(x) OSSwapConstInt64(x)
 193 #define le64toh(x) (x)
 194
 195 #else /* BYTE_ORDER == LITTLE_ENDIAN */
 196 #define htobe16(x) (x)
 197 #define htole16(x) OSSwapConstInt16(x)
 198 #define be16toh(x) (x)
 199 #define le16toh(x) OSSwapConstInt16(x)
 200
 201 #define htobe32(x) (x)
 202 #define htole32(x) OSSwapConstInt32(x)
 203 #define be32toh(x) (x)
 204 #define le32toh(x) OSSwapConstInt32(x)
 205
 206 #define htobe64(x) (x)
 207 #define htole64(x) OSSwapConstInt64(x)
 208 #define be64toh(x) (x)
 209 #define le64toh(x) OSSwapConstInt64(x)
 210 #endif
 211
 212 #else
 213 #error "Please add support for your OS."
 214 #endif
 215
 216 #endif /* _COMPAT_ENDIAN_H */