/src/boost/boost/uuid/detail/endian.hpp
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1 | | #ifndef BOOST_UUID_DETAIL_ENDIAN_INCLUDED |
2 | | #define BOOST_UUID_DETAIL_ENDIAN_INCLUDED |
3 | | |
4 | | // Copyright 2024 Peter Dimov |
5 | | // Distributed under the Boost Software License, Version 1.0. |
6 | | // https://www.boost.org/LICENSE_1_0.txt |
7 | | |
8 | | #include <boost/uuid/detail/is_constant_evaluated.hpp> |
9 | | #include <boost/uuid/detail/cstring.hpp> |
10 | | #include <boost/config.hpp> |
11 | | #include <cstdint> |
12 | | |
13 | | #if defined(_MSC_VER) && !defined(__clang__) |
14 | | # include <intrin.h> |
15 | | #endif |
16 | | |
17 | | namespace boost { |
18 | | namespace uuids { |
19 | | namespace detail { |
20 | | |
21 | | // Byte order macros |
22 | | |
23 | | #if defined(__BYTE_ORDER__) |
24 | | |
25 | | #define BOOST_UUID_BYTE_ORDER __BYTE_ORDER__ |
26 | | #define BOOST_UUID_ORDER_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ |
27 | | #define BOOST_UUID_ORDER_BIG_ENDIAN __ORDER_BIG_ENDIAN__ |
28 | | |
29 | | #elif defined(__LITTLE_ENDIAN__) || defined(_MSC_VER) || defined(__i386__) || defined(__x86_64__) |
30 | | |
31 | | #define BOOST_UUID_BYTE_ORDER 1234 |
32 | | #define BOOST_UUID_ORDER_LITTLE_ENDIAN 1234 |
33 | | #define BOOST_UUID_ORDER_BIG_ENDIAN 4321 |
34 | | |
35 | | #elif defined(__BIG_ENDIAN__) |
36 | | |
37 | | #define BOOST_UUID_BYTE_ORDER 4321 |
38 | | #define BOOST_UUID_ORDER_LITTLE_ENDIAN 1234 |
39 | | #define BOOST_UUID_ORDER_BIG_ENDIAN 4321 |
40 | | |
41 | | #else |
42 | | |
43 | | # error Unrecognized platform |
44 | | |
45 | | #endif |
46 | | |
47 | | // byteswap |
48 | | |
49 | | #if defined(__GNUC__) || defined(__clang__) |
50 | | |
51 | | BOOST_CXX14_CONSTEXPR inline std::uint16_t byteswap( std::uint16_t x ) noexcept |
52 | 0 | { |
53 | 0 | return __builtin_bswap16( x ); |
54 | 0 | } |
55 | | |
56 | | BOOST_CXX14_CONSTEXPR inline std::uint32_t byteswap( std::uint32_t x ) noexcept |
57 | 35 | { |
58 | 35 | return __builtin_bswap32( x ); |
59 | 35 | } |
60 | | |
61 | | BOOST_CXX14_CONSTEXPR inline std::uint64_t byteswap( std::uint64_t x ) noexcept |
62 | 0 | { |
63 | 0 | return __builtin_bswap64( x ); |
64 | 0 | } |
65 | | |
66 | | #elif defined(_MSC_VER) |
67 | | |
68 | | inline std::uint16_t byteswap( std::uint16_t x ) noexcept |
69 | | { |
70 | | return _byteswap_ushort( x ); |
71 | | } |
72 | | |
73 | | inline std::uint32_t byteswap( std::uint32_t x ) noexcept |
74 | | { |
75 | | return _byteswap_ulong( x ); |
76 | | } |
77 | | |
78 | | inline std::uint64_t byteswap( std::uint64_t x ) noexcept |
79 | | { |
80 | | return _byteswap_uint64( x ); |
81 | | } |
82 | | |
83 | | #else |
84 | | |
85 | | BOOST_CXX14_CONSTEXPR inline std::uint16_t byteswap( std::uint16_t x ) noexcept |
86 | | { |
87 | | return static_cast<std::uint16_t>( x << 8 | x >> 8 ); |
88 | | } |
89 | | |
90 | | BOOST_CXX14_CONSTEXPR inline std::uint32_t byteswap( std::uint32_t x ) noexcept |
91 | | { |
92 | | std::uint32_t step16 = x << 16 | x >> 16; |
93 | | return ((step16 << 8) & 0xff00ff00) | ((step16 >> 8) & 0x00ff00ff); |
94 | | } |
95 | | |
96 | | BOOST_CXX14_CONSTEXPR inline std::uint64_t byteswap( std::uint64_t x ) noexcept |
97 | | { |
98 | | std::uint64_t step32 = x << 32 | x >> 32; |
99 | | std::uint64_t step16 = (step32 & 0x0000FFFF0000FFFFULL) << 16 | (step32 & 0xFFFF0000FFFF0000ULL) >> 16; |
100 | | return (step16 & 0x00FF00FF00FF00FFULL) << 8 | (step16 & 0xFF00FF00FF00FF00ULL) >> 8; |
101 | | } |
102 | | |
103 | | #endif |
104 | | |
105 | | #if defined(__SIZEOF_INT128__) |
106 | | |
107 | | BOOST_CXX14_CONSTEXPR inline __uint128_t byteswap( __uint128_t x ) noexcept |
108 | 0 | { |
109 | 0 | return ( static_cast<__uint128_t>( detail::byteswap( static_cast<std::uint64_t>( x ) ) ) << 64 ) | detail::byteswap( static_cast<std::uint64_t>( x >> 64 ) ); |
110 | 0 | } |
111 | | |
112 | | #endif |
113 | | |
114 | | // load_*_u16 |
115 | | |
116 | | inline std::uint16_t load_native_u16( void const* p ) noexcept |
117 | 0 | { |
118 | 0 | std::uint16_t tmp; |
119 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
120 | 0 | return tmp; |
121 | 0 | } |
122 | | |
123 | | inline std::uint16_t load_little_u16( void const* p ) noexcept |
124 | 0 | { |
125 | 0 | std::uint16_t tmp; |
126 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
127 | 0 |
|
128 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN |
129 | 0 |
|
130 | 0 | return tmp; |
131 | 0 |
|
132 | 0 | #else |
133 | 0 |
|
134 | 0 | return detail::byteswap( tmp ); |
135 | 0 |
|
136 | 0 | #endif |
137 | 0 | } |
138 | | |
139 | | BOOST_CXX14_CONSTEXPR inline std::uint16_t load_big_u16( unsigned char const* p ) noexcept |
140 | 0 | { |
141 | 0 | if( is_constant_evaluated_cx() ) |
142 | 0 | { |
143 | 0 | return static_cast<std::uint16_t>( ( p[ 0 ] << 8 ) | p[ 1 ] ); |
144 | 0 | } |
145 | 0 |
|
146 | 0 | std::uint16_t tmp = {}; |
147 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
148 | 0 |
|
149 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN |
150 | 0 |
|
151 | 0 | return tmp; |
152 | 0 |
|
153 | 0 | #else |
154 | 0 |
|
155 | 0 | return detail::byteswap( tmp ); |
156 | 0 |
|
157 | 0 | #endif |
158 | 0 | } |
159 | | |
160 | | // load_*_u32 |
161 | | |
162 | | inline std::uint32_t load_native_u32( void const* p ) noexcept |
163 | 0 | { |
164 | 0 | std::uint32_t tmp; |
165 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
166 | 0 | return tmp; |
167 | 0 | } |
168 | | |
169 | | BOOST_CXX14_CONSTEXPR inline std::uint32_t load_little_u32( unsigned char const* p ) noexcept |
170 | 84 | { |
171 | 84 | if( is_constant_evaluated_cx() ) |
172 | 0 | { |
173 | 0 | return |
174 | |
|
175 | 0 | static_cast<std::uint32_t>( p[ 0 ] ) | |
176 | 0 | static_cast<std::uint32_t>( p[ 1 ] ) << 8 | |
177 | 0 | static_cast<std::uint32_t>( p[ 2 ] ) << 16 | |
178 | 0 | static_cast<std::uint32_t>( p[ 3 ] ) << 24; |
179 | 0 | } |
180 | | |
181 | 84 | std::uint32_t tmp = {}; |
182 | 84 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
183 | | |
184 | 84 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN |
185 | | |
186 | 84 | return tmp; |
187 | | |
188 | | #else |
189 | | |
190 | | return detail::byteswap( tmp ); |
191 | | |
192 | | #endif |
193 | 84 | } |
194 | | |
195 | | BOOST_CXX14_CONSTEXPR inline std::uint32_t load_big_u32( unsigned char const* p ) noexcept |
196 | 0 | { |
197 | 0 | if( is_constant_evaluated_cx() ) |
198 | 0 | { |
199 | 0 | return |
200 | 0 |
|
201 | 0 | static_cast<std::uint32_t>( p[ 0 ] ) << 24 | |
202 | 0 | static_cast<std::uint32_t>( p[ 1 ] ) << 16 | |
203 | 0 | static_cast<std::uint32_t>( p[ 2 ] ) << 8 | |
204 | 0 | static_cast<std::uint32_t>( p[ 3 ] ); |
205 | 0 | } |
206 | 0 |
|
207 | 0 | std::uint32_t tmp = {}; |
208 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
209 | 0 |
|
210 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN |
211 | 0 |
|
212 | 0 | return tmp; |
213 | 0 |
|
214 | 0 | #else |
215 | 0 |
|
216 | 0 | return detail::byteswap( tmp ); |
217 | 0 |
|
218 | 0 | #endif |
219 | 0 | } |
220 | | |
221 | | // load_*_u64 |
222 | | |
223 | | inline std::uint64_t load_native_u64( void const* p ) noexcept |
224 | 0 | { |
225 | 0 | std::uint64_t tmp = {}; |
226 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
227 | 0 | return tmp; |
228 | 0 | } |
229 | | |
230 | | inline std::uint64_t load_little_u64( void const* p ) noexcept |
231 | 0 | { |
232 | 0 | std::uint64_t tmp; |
233 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
234 | 0 |
|
235 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN |
236 | 0 |
|
237 | 0 | return tmp; |
238 | 0 |
|
239 | 0 | #else |
240 | 0 |
|
241 | 0 | return detail::byteswap( tmp ); |
242 | 0 |
|
243 | 0 | #endif |
244 | 0 | } |
245 | | |
246 | | BOOST_CXX14_CONSTEXPR inline std::uint64_t load_big_u64( unsigned char const* p ) noexcept |
247 | 0 | { |
248 | 0 | if( is_constant_evaluated_cx() ) |
249 | 0 | { |
250 | 0 | return |
251 | 0 |
|
252 | 0 | static_cast<std::uint64_t>( p[ 0 ] ) << 56 | |
253 | 0 | static_cast<std::uint64_t>( p[ 1 ] ) << 48 | |
254 | 0 | static_cast<std::uint64_t>( p[ 2 ] ) << 40 | |
255 | 0 | static_cast<std::uint64_t>( p[ 3 ] ) << 32 | |
256 | 0 | static_cast<std::uint64_t>( p[ 4 ] ) << 24 | |
257 | 0 | static_cast<std::uint64_t>( p[ 5 ] ) << 16 | |
258 | 0 | static_cast<std::uint64_t>( p[ 6 ] ) << 8 | |
259 | 0 | static_cast<std::uint64_t>( p[ 7 ] ); |
260 | 0 | } |
261 | 0 |
|
262 | 0 | std::uint64_t tmp = {}; |
263 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
264 | 0 |
|
265 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN |
266 | 0 |
|
267 | 0 | return tmp; |
268 | 0 |
|
269 | 0 | #else |
270 | 0 |
|
271 | 0 | return detail::byteswap( tmp ); |
272 | 0 |
|
273 | 0 | #endif |
274 | 0 | } |
275 | | |
276 | | // load_*_u128 |
277 | | |
278 | | #if defined(__SIZEOF_INT128__) |
279 | | |
280 | | inline __uint128_t load_native_u128( void const* p ) noexcept |
281 | 0 | { |
282 | 0 | __uint128_t tmp = {}; |
283 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
284 | 0 | return tmp; |
285 | 0 | } |
286 | | |
287 | | inline __uint128_t load_little_u128( void const* p ) noexcept |
288 | 0 | { |
289 | 0 | __uint128_t tmp; |
290 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
291 | 0 |
|
292 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN |
293 | 0 |
|
294 | 0 | return tmp; |
295 | 0 |
|
296 | 0 | #else |
297 | 0 |
|
298 | 0 | return detail::byteswap( tmp ); |
299 | 0 |
|
300 | 0 | #endif |
301 | 0 | } |
302 | | |
303 | | inline __uint128_t load_big_u128( void const* p ) noexcept |
304 | 0 | { |
305 | 0 | __uint128_t tmp = {}; |
306 | 0 | detail::memcpy( &tmp, p, sizeof( tmp ) ); |
307 | 0 |
|
308 | 0 | #if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN |
309 | 0 |
|
310 | 0 | return tmp; |
311 | 0 |
|
312 | 0 | #else |
313 | 0 |
|
314 | 0 | return detail::byteswap( tmp ); |
315 | 0 |
|
316 | 0 | #endif |
317 | 0 | } |
318 | | |
319 | | #endif |
320 | | |
321 | | // store_*_u16 |
322 | | |
323 | | inline void store_native_u16( void* p, std::uint16_t v ) noexcept |
324 | 0 | { |
325 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
326 | 0 | } |
327 | | |
328 | | inline void store_little_u16( void* p, std::uint16_t v ) noexcept |
329 | 0 | { |
330 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN |
331 | 0 |
|
332 | 0 | v = detail::byteswap( v ); |
333 | 0 |
|
334 | 0 | #endif |
335 | 0 |
|
336 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
337 | 0 | } |
338 | | |
339 | | inline void store_big_u16( void* p, std::uint16_t v ) noexcept |
340 | 0 | { |
341 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN |
342 | 0 |
|
343 | 0 | v = detail::byteswap( v ); |
344 | 0 |
|
345 | 0 | #endif |
346 | 0 |
|
347 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
348 | 0 | } |
349 | | |
350 | | // store_*_u32 |
351 | | |
352 | | inline void store_native_u32( void* p, std::uint32_t v ) noexcept |
353 | 7 | { |
354 | 7 | detail::memcpy( p, &v, sizeof( v ) ); |
355 | 7 | } |
356 | | |
357 | | inline void store_little_u32( void* p, std::uint32_t v ) noexcept |
358 | 0 | { |
359 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN |
360 | 0 |
|
361 | 0 | v = detail::byteswap( v ); |
362 | 0 |
|
363 | 0 | #endif |
364 | 0 |
|
365 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
366 | 0 | } |
367 | | |
368 | | inline void store_big_u32( void* p, std::uint32_t v ) noexcept |
369 | 35 | { |
370 | 35 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN |
371 | | |
372 | 35 | v = detail::byteswap( v ); |
373 | | |
374 | 35 | #endif |
375 | | |
376 | 35 | detail::memcpy( p, &v, sizeof( v ) ); |
377 | 35 | } |
378 | | |
379 | | // store_*_u64 |
380 | | |
381 | | inline void store_native_u64( void* p, std::uint64_t v ) noexcept |
382 | 0 | { |
383 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
384 | 0 | } |
385 | | |
386 | | inline void store_little_u64( void* p, std::uint64_t v ) noexcept |
387 | 0 | { |
388 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN |
389 | 0 |
|
390 | 0 | v = detail::byteswap( v ); |
391 | 0 |
|
392 | 0 | #endif |
393 | 0 |
|
394 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
395 | 0 | } |
396 | | |
397 | | inline void store_big_u64( void* p, std::uint64_t v ) noexcept |
398 | 0 | { |
399 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN |
400 | 0 |
|
401 | 0 | v = detail::byteswap( v ); |
402 | 0 |
|
403 | 0 | #endif |
404 | 0 |
|
405 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
406 | 0 | } |
407 | | |
408 | | // store_*_u128 |
409 | | |
410 | | #if defined(__SIZEOF_INT128__) |
411 | | |
412 | | inline void store_native_u128( void* p, __uint128_t v ) noexcept |
413 | 0 | { |
414 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
415 | 0 | } |
416 | | |
417 | | inline void store_little_u128( void* p, __uint128_t v ) noexcept |
418 | 0 | { |
419 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN |
420 | 0 |
|
421 | 0 | v = detail::byteswap( v ); |
422 | 0 |
|
423 | 0 | #endif |
424 | 0 |
|
425 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
426 | 0 | } |
427 | | |
428 | | inline void store_big_u128( void* p, __uint128_t v ) noexcept |
429 | 0 | { |
430 | 0 | #if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN |
431 | 0 |
|
432 | 0 | v = detail::byteswap( v ); |
433 | 0 |
|
434 | 0 | #endif |
435 | 0 |
|
436 | 0 | detail::memcpy( p, &v, sizeof( v ) ); |
437 | 0 | } |
438 | | |
439 | | #endif |
440 | | |
441 | | } // detail |
442 | | } // uuids |
443 | | } // boost |
444 | | |
445 | | #endif // #ifndef BOOST_UUID_DETAIL_ENDIAN_INCLUDED |