1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* Copyright (c) INRIA and Microsoft Corporation. All rights reserved.
Licensed under the Apache 2.0 License. */
#ifndef __LOWSTAR_ENDIANNESS_H
#define __LOWSTAR_ENDIANNESS_H
#include <string.h>
#include <inttypes.h>
/******************************************************************************/
/* Implementing C.fst (part 2: endian-ness macros) */
/******************************************************************************/
/* ... for Linux */
#if defined(__linux__) || defined(__CYGWIN__) || defined (__USE_SYSTEM_ENDIAN_H__) || defined(__GLIBC__)
# include <endian.h>
/* ... for OSX */
#elif defined(__APPLE__)
# include <libkern/OSByteOrder.h>
# define htole64(x) OSSwapHostToLittleInt64(x)
# define le64toh(x) OSSwapLittleToHostInt64(x)
# define htobe64(x) OSSwapHostToBigInt64(x)
# define be64toh(x) OSSwapBigToHostInt64(x)
# define htole16(x) OSSwapHostToLittleInt16(x)
# define le16toh(x) OSSwapLittleToHostInt16(x)
# define htobe16(x) OSSwapHostToBigInt16(x)
# define be16toh(x) OSSwapBigToHostInt16(x)
# define htole32(x) OSSwapHostToLittleInt32(x)
# define le32toh(x) OSSwapLittleToHostInt32(x)
# define htobe32(x) OSSwapHostToBigInt32(x)
# define be32toh(x) OSSwapBigToHostInt32(x)
/* ... for Solaris */
#elif defined(__sun__)
# include <sys/byteorder.h>
# define htole64(x) LE_64(x)
# define le64toh(x) LE_64(x)
# define htobe64(x) BE_64(x)
# define be64toh(x) BE_64(x)
# define htole16(x) LE_16(x)
# define le16toh(x) LE_16(x)
# define htobe16(x) BE_16(x)
# define be16toh(x) BE_16(x)
# define htole32(x) LE_32(x)
# define le32toh(x) LE_32(x)
# define htobe32(x) BE_32(x)
# define be32toh(x) BE_32(x)
/* ... for the BSDs */
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
# include <sys/endian.h>
#elif defined(__OpenBSD__)
# include <endian.h>
/* ... for Windows (MSVC)... not targeting XBOX 360! */
#elif defined(_MSC_VER)
# include <stdlib.h>
# define htobe16(x) _byteswap_ushort(x)
# define htole16(x) (x)
# define be16toh(x) _byteswap_ushort(x)
# define le16toh(x) (x)
# define htobe32(x) _byteswap_ulong(x)
# define htole32(x) (x)
# define be32toh(x) _byteswap_ulong(x)
# define le32toh(x) (x)
# define htobe64(x) _byteswap_uint64(x)
# define htole64(x) (x)
# define be64toh(x) _byteswap_uint64(x)
# define le64toh(x) (x)
/* ... for Windows (GCC-like, e.g. mingw or clang) */
#elif (defined(_WIN32) || defined(_WIN64)) && \
(defined(__GNUC__) || defined(__clang__))
# define htobe16(x) __builtin_bswap16(x)
# define htole16(x) (x)
# define be16toh(x) __builtin_bswap16(x)
# define le16toh(x) (x)
# define htobe32(x) __builtin_bswap32(x)
# define htole32(x) (x)
# define be32toh(x) __builtin_bswap32(x)
# define le32toh(x) (x)
# define htobe64(x) __builtin_bswap64(x)
# define htole64(x) (x)
# define be64toh(x) __builtin_bswap64(x)
# define le64toh(x) (x)
/* ... generic big-endian fallback code */
#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* byte swapping code inspired by:
* https://github.com/rweather/arduinolibs/blob/master/libraries/Crypto/utility/EndianUtil.h
* */
# define htobe32(x) (x)
# define be32toh(x) (x)
# define htole32(x) \
(__extension__({ \
uint32_t _temp = (x); \
((_temp >> 24) & 0x000000FF) | ((_temp >> 8) & 0x0000FF00) | \
((_temp << 8) & 0x00FF0000) | ((_temp << 24) & 0xFF000000); \
}))
# define le32toh(x) (htole32((x)))
# define htobe64(x) (x)
# define be64toh(x) (x)
# define htole64(x) \
(__extension__({ \
uint64_t __temp = (x); \
uint32_t __low = htobe32((uint32_t)__temp); \
uint32_t __high = htobe32((uint32_t)(__temp >> 32)); \
(((uint64_t)__low) << 32) | __high; \
}))
# define le64toh(x) (htole64((x)))
/* ... generic little-endian fallback code */
#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define htole32(x) (x)
# define le32toh(x) (x)
# define htobe32(x) \
(__extension__({ \
uint32_t _temp = (x); \
((_temp >> 24) & 0x000000FF) | ((_temp >> 8) & 0x0000FF00) | \
((_temp << 8) & 0x00FF0000) | ((_temp << 24) & 0xFF000000); \
}))
# define be32toh(x) (htobe32((x)))
# define htole64(x) (x)
# define le64toh(x) (x)
# define htobe64(x) \
(__extension__({ \
uint64_t __temp = (x); \
uint32_t __low = htobe32((uint32_t)__temp); \
uint32_t __high = htobe32((uint32_t)(__temp >> 32)); \
(((uint64_t)__low) << 32) | __high; \
}))
# define be64toh(x) (htobe64((x)))
/* ... couldn't determine endian-ness of the target platform */
#else
# error "Please define __BYTE_ORDER__!"
#endif /* defined(__linux__) || ... */
/* Loads and stores. These avoid undefined behavior due to unaligned memory
* accesses, via memcpy. */
inline static uint16_t load16(uint8_t *b) {
uint16_t x;
memcpy(&x, b, 2);
return x;
}
inline static uint32_t load32(uint8_t *b) {
uint32_t x;
memcpy(&x, b, 4);
return x;
}
inline static uint64_t load64(uint8_t *b) {
uint64_t x;
memcpy(&x, b, 8);
return x;
}
inline static void store16(uint8_t *b, uint16_t i) {
memcpy(b, &i, 2);
}
inline static void store32(uint8_t *b, uint32_t i) {
memcpy(b, &i, 4);
}
inline static void store64(uint8_t *b, uint64_t i) {
memcpy(b, &i, 8);
}
/* Legacy accessors so that this header can serve as an implementation of
* C.Endianness */
#define load16_le(b) (le16toh(load16(b)))
#define store16_le(b, i) (store16(b, htole16(i)))
#define load16_be(b) (be16toh(load16(b)))
#define store16_be(b, i) (store16(b, htobe16(i)))
#define load32_le(b) (le32toh(load32(b)))
#define store32_le(b, i) (store32(b, htole32(i)))
#define load32_be(b) (be32toh(load32(b)))
#define store32_be(b, i) (store32(b, htobe32(i)))
#define load64_le(b) (le64toh(load64(b)))
#define store64_le(b, i) (store64(b, htole64(i)))
#define load64_be(b) (be64toh(load64(b)))
#define store64_be(b, i) (store64(b, htobe64(i)))
/* Co-existence of LowStar.Endianness and FStar.Endianness generates name
* conflicts, because of course both insist on having no prefixes. Until a
* prefix is added, or until we truly retire FStar.Endianness, solve this issue
* in an elegant way. */
#define load16_le0 load16_le
#define store16_le0 store16_le
#define load16_be0 load16_be
#define store16_be0 store16_be
#define load32_le0 load32_le
#define store32_le0 store32_le
#define load32_be0 load32_be
#define store32_be0 store32_be
#define load64_le0 load64_le
#define store64_le0 store64_le
#define load64_be0 load64_be
#define store64_be0 store64_be
#define load128_le0 load128_le
#define store128_le0 store128_le
#define load128_be0 load128_be
#define store128_be0 store128_be
#endif
|
