Bitcoin Core  0.20.99
P2P Digital Currency
byteswap.h
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1 // Copyright (c) 2014-2019 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)
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 #include <libkern/OSByteOrder.h>
21 #define bswap_16(x) OSSwapInt16(x)
22 #define bswap_32(x) OSSwapInt32(x)
23 #define bswap_64(x) OSSwapInt64(x)
24 
25 #else
26 // Non-MacOS / non-Darwin
27 
28 #if HAVE_DECL_BSWAP_16 == 0
29 inline uint16_t bswap_16(uint16_t x)
30 {
31  return (x >> 8) | (x << 8);
32 }
33 #endif // HAVE_DECL_BSWAP16 == 0
34 
35 #if HAVE_DECL_BSWAP_32 == 0
36 inline uint32_t bswap_32(uint32_t x)
37 {
38  return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >> 8) |
39  ((x & 0x0000ff00U) << 8) | ((x & 0x000000ffU) << 24));
40 }
41 #endif // HAVE_DECL_BSWAP32 == 0
42 
43 #if HAVE_DECL_BSWAP_64 == 0
44 inline uint64_t bswap_64(uint64_t x)
45 {
46  return (((x & 0xff00000000000000ull) >> 56)
47  | ((x & 0x00ff000000000000ull) >> 40)
48  | ((x & 0x0000ff0000000000ull) >> 24)
49  | ((x & 0x000000ff00000000ull) >> 8)
50  | ((x & 0x00000000ff000000ull) << 8)
51  | ((x & 0x0000000000ff0000ull) << 24)
52  | ((x & 0x000000000000ff00ull) << 40)
53  | ((x & 0x00000000000000ffull) << 56));
54 }
55 #endif // HAVE_DECL_BSWAP64 == 0
56 
57 #endif // defined(MAC_OSX)
58 
59 #endif // BITCOIN_COMPAT_BYTESWAP_H
uint32_t bswap_32(uint32_t x)
Definition: byteswap.h:36
uint16_t bswap_16(uint16_t x)
Definition: byteswap.h:29
uint64_t bswap_64(uint64_t x)
Definition: byteswap.h:44