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8bdd5c12 MD |
1 | // SPDX-License-Identifier: MIT |
2 | /* | |
3 | * | |
4 | * Copyright (C) 2012,2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This header defines the following endian macros based on the current | |
9 | * platform endian headers: | |
10 | * | |
11 | * BYTE_ORDER this macro shall have a value equal to one | |
12 | * of the *_ENDIAN macros in this header. | |
13 | * FLOAT_WORD_ORDER this macro shall have a value equal to one | |
14 | * of the *_ENDIAN macros in this header. | |
15 | * LITTLE_ENDIAN if BYTE_ORDER == LITTLE_ENDIAN, the host | |
16 | * byte order is from least significant to | |
17 | * most significant. | |
18 | * BIG_ENDIAN if BYTE_ORDER == BIG_ENDIAN, the host byte | |
19 | * order is from most significant to least | |
20 | * significant. | |
21 | * | |
22 | * Direct byte swapping interfaces: | |
23 | * | |
24 | * uint16_t bswap_16(uint16_t x); (* swap bytes 16-bit word *) | |
25 | * uint32_t bswap_32(uint32_t x); (* swap bytes 32-bit word *) | |
26 | * uint64_t bswap_64(uint32_t x); (* swap bytes 64-bit word *) | |
27 | */ | |
28 | ||
67337c4a MD |
29 | #ifndef _SIDE_ENDIAN_H |
30 | #define _SIDE_ENDIAN_H | |
8bdd5c12 MD |
31 | |
32 | #include <math.h> | |
33 | ||
2e197497 MD |
34 | #if defined(__SIZEOF_LONG__) |
35 | # define SIDE_BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
36 | #elif defined(_LP64) | |
37 | # define SIDE_BITS_PER_LONG 64 | |
38 | #else | |
39 | # define SIDE_BITS_PER_LONG 32 | |
40 | #endif | |
41 | ||
8bdd5c12 MD |
42 | #if (defined(__linux__) || defined(__CYGWIN__)) |
43 | #include <endian.h> | |
44 | #include <byteswap.h> | |
45 | ||
67337c4a MD |
46 | #define side_bswap_16(x) bswap_16(x) |
47 | #define side_bswap_32(x) bswap_32(x) | |
48 | #define side_bswap_64(x) bswap_64(x) | |
8bdd5c12 | 49 | |
67337c4a MD |
50 | #define SIDE_BYTE_ORDER __BYTE_ORDER |
51 | #define SIDE_LITTLE_ENDIAN __LITTLE_ENDIAN | |
52 | #define SIDE_BIG_ENDIAN __BIG_ENDIAN | |
8bdd5c12 MD |
53 | |
54 | #ifdef __FLOAT_WORD_ORDER | |
67337c4a | 55 | #define SIDE_FLOAT_WORD_ORDER __FLOAT_WORD_ORDER |
8bdd5c12 | 56 | #else /* __FLOAT_WORD_ORDER */ |
67337c4a | 57 | #define SIDE_FLOAT_WORD_ORDER __BYTE_ORDER |
8bdd5c12 MD |
58 | #endif /* __FLOAT_WORD_ORDER */ |
59 | ||
60 | #elif defined(__FreeBSD__) | |
61 | ||
62 | #include <sys/endian.h> | |
63 | ||
67337c4a MD |
64 | #define side_bswap_16(x) bswap16(x) |
65 | #define side_bswap_32(x) bswap32(x) | |
66 | #define side_bswap_64(x) bswap64(x) | |
8bdd5c12 | 67 | |
67337c4a MD |
68 | #define SIDE_BYTE_ORDER BYTE_ORDER |
69 | #define SIDE_LITTLE_ENDIAN LITTLE_ENDIAN | |
70 | #define SIDE_BIG_ENDIAN BIG_ENDIAN | |
71 | #define SIDE_FLOAT_WORD_ORDER BYTE_ORDER | |
8bdd5c12 MD |
72 | |
73 | #else | |
74 | #error "Please add support for your OS." | |
75 | #endif | |
76 | ||
084105d5 MD |
77 | #ifdef __cplusplus |
78 | extern "C" { | |
79 | #endif | |
80 | ||
8bdd5c12 MD |
81 | #ifdef __HAVE_FLOAT128 |
82 | static inline | |
67337c4a | 83 | void side_bswap_128p(char *p) |
8bdd5c12 MD |
84 | { |
85 | int i; | |
86 | ||
87 | for (i = 0; i < 8; i++) | |
88 | p[i] = p[15 - i]; | |
89 | } | |
90 | #endif | |
91 | ||
084105d5 MD |
92 | #ifdef __cplusplus |
93 | } | |
94 | #endif | |
95 | ||
67337c4a MD |
96 | #if SIDE_BITS_PER_LONG == 64 |
97 | # define side_bswap_pointer(x) side_bswap_64(x) | |
f5e650d7 | 98 | #else |
67337c4a | 99 | # define side_bswap_pointer(x) side_bswap_32(x) |
f5e650d7 MD |
100 | #endif |
101 | ||
67337c4a | 102 | #endif /* _SIDE_ENDIAN_H */ |