src/compat/byteswap.h

   1 // Copyright (c) 2014 The Bitcoin developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #ifndef BITCOIN_COMPAT_BYTESWAP_H
   6 #define BITCOIN_COMPAT_BYTESWAP_H
   7
   8 #if defined(HAVE_CONFIG_H)
   9 #include "config/bitcoin-config.h"
  10 #endif
  11
  12 #include <stdint.h>
  13
  14 #if defined(HAVE_BYTESWAP_H)
  15 #include <byteswap.h>
  16 #endif
  17
  18 #if HAVE_DECL_BSWAP_16 == 0
  19 inline uint16_t bswap_16(uint16_t x)
  20 {
  21     return (x >> 8) | ((x & 0x00ff) << 8);
  22 }
  23 #endif // HAVE_DECL_BSWAP16
  24
  25 #if HAVE_DECL_BSWAP_32 == 0
  26 inline uint32_t bswap_32(uint32_t x)
  27 {
  28     return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >>  8) |
  29             ((x & 0x0000ff00U) <<  8) | ((x & 0x000000ffU) << 24));
  30 }
  31 #endif // HAVE_DECL_BSWAP32
  32
  33 #if HAVE_DECL_BSWAP_64 == 0
  34 inline uint64_t bswap_64(uint64_t x)
  35 {
  36      return (((x & 0xff00000000000000ull) >> 56)
  37           | ((x & 0x00ff000000000000ull) >> 40)
  38           | ((x & 0x0000ff0000000000ull) >> 24)
  39           | ((x & 0x000000ff00000000ull) >> 8)
  40           | ((x & 0x00000000ff000000ull) << 8)
  41           | ((x & 0x0000000000ff0000ull) << 24)
  42           | ((x & 0x000000000000ff00ull) << 40)
  43           | ((x & 0x00000000000000ffull) << 56));
  44 }
  45 #endif // HAVE_DECL_BSWAP64
  46
  47 #endif // BITCOIN_COMPAT_BYTESWAP_H