Bitcoin ABC  0.22.13
P2P Digital Currency
byteswap.h
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1 // Copyright (c) 2014-2016 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 <cstdint>
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
23 // already defined, protobuf has defined these macros for us already; if it
24 // isn't, we do it ourselves. In either case, we get the exact same result
25 // regardless which path was taken
26 #include <libkern/OSByteOrder.h>
27 #define bswap_16(x) OSSwapInt16(x)
28 #define bswap_32(x) OSSwapInt32(x)
29 #define bswap_64(x) OSSwapInt64(x)
30 
31 #endif // !defined(bswap_16)
32 
33 #else
34 // Non-Mac OS X / non-Darwin
35 
36 #if HAVE_DECL_BSWAP_16 == 0
37 inline uint16_t bswap_16(uint16_t x) {
38  return (x >> 8) | (x << 8);
39 }
40 #endif // HAVE_DECL_BSWAP16 == 0
41 
42 #if HAVE_DECL_BSWAP_32 == 0
43 inline uint32_t bswap_32(uint32_t x) {
44  return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >> 8) |
45  ((x & 0x0000ff00U) << 8) | ((x & 0x000000ffU) << 24));
46 }
47 #endif // HAVE_DECL_BSWAP32 == 0
48 
49 #if HAVE_DECL_BSWAP_64 == 0
50 inline uint64_t bswap_64(uint64_t x) {
51  return (((x & 0xff00000000000000ull) >> 56) |
52  ((x & 0x00ff000000000000ull) >> 40) |
53  ((x & 0x0000ff0000000000ull) >> 24) |
54  ((x & 0x000000ff00000000ull) >> 8) |
55  ((x & 0x00000000ff000000ull) << 8) |
56  ((x & 0x0000000000ff0000ull) << 24) |
57  ((x & 0x000000000000ff00ull) << 40) |
58  ((x & 0x00000000000000ffull) << 56));
59 }
60 #endif // HAVE_DECL_BSWAP64 == 0
61 
62 #endif // defined(MAC_OSX)
63 
64 #endif // BITCOIN_COMPAT_BYTESWAP_H
uint32_t bswap_32(uint32_t x)
Definition: byteswap.h:43
uint16_t bswap_16(uint16_t x)
Definition: byteswap.h:37
uint64_t bswap_64(uint64_t x)
Definition: byteswap.h:50