1 // Copyright (c) 2014-2018 The Bitcoin Core 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 defined(MAC_OSX) 19 20 #if !defined(bswap_16) 21 22 // Mac OS X / Darwin features; we include a check for bswap_16 because if it is already defined, protobuf has 23 // defined these macros for us already; if it isn't, we do it ourselves. In either case, we get the exact same 24 // result regardless which path was taken 25 #include <libkern/OSByteOrder.h> 26 #define bswap_16(x) OSSwapInt16(x) 27 #define bswap_32(x) OSSwapInt32(x) 28 #define bswap_64(x) OSSwapInt64(x) 29 30 #endif // !defined(bswap_16) 31 32 #else 33 // Non-Mac OS X / non-Darwin 34 35 #if HAVE_DECL_BSWAP_16 == 0 bswap_16(uint16_t x)36inline uint16_t bswap_16(uint16_t x) 37 { 38 return (x >> 8) | (x << 8); 39 } 40 #endif // HAVE_DECL_BSWAP16 == 0 41 42 #if HAVE_DECL_BSWAP_32 == 0 bswap_32(uint32_t x)43inline uint32_t bswap_32(uint32_t x) 44 { 45 return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >> 8) | 46 ((x & 0x0000ff00U) << 8) | ((x & 0x000000ffU) << 24)); 47 } 48 #endif // HAVE_DECL_BSWAP32 == 0 49 50 #if HAVE_DECL_BSWAP_64 == 0 bswap_64(uint64_t x)51inline uint64_t bswap_64(uint64_t x) 52 { 53 return (((x & 0xff00000000000000ull) >> 56) 54 | ((x & 0x00ff000000000000ull) >> 40) 55 | ((x & 0x0000ff0000000000ull) >> 24) 56 | ((x & 0x000000ff00000000ull) >> 8) 57 | ((x & 0x00000000ff000000ull) << 8) 58 | ((x & 0x0000000000ff0000ull) << 24) 59 | ((x & 0x000000000000ff00ull) << 40) 60 | ((x & 0x00000000000000ffull) << 56)); 61 } 62 #endif // HAVE_DECL_BSWAP64 == 0 63 64 #endif // defined(MAC_OSX) 65 66 #endif // BITCOIN_COMPAT_BYTESWAP_H 67