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1 | // boost/endian/buffers.hpp ----------------------------------------------------------// |
2 | ||
3 | // (C) Copyright Darin Adler 2000 | |
4 | // (C) Copyright Beman Dawes 2006, 2009, 2014 | |
5 | ||
6 | // Distributed under the Boost Software License, Version 1.0. | |
7 | // See http://www.boost.org/LICENSE_1_0.txt | |
8 | ||
9 | // See library home page at http://www.boost.org/libs/endian | |
10 | ||
11 | //--------------------------------------------------------------------------------------// | |
12 | ||
13 | // Original design developed by Darin Adler based on classes developed by Mark | |
14 | // Borgerding. Four original class templates were combined into a single endian | |
15 | // class template by Beman Dawes, who also added the unrolled_byte_loops sign | |
16 | // partial specialization to correctly extend the sign when cover integer size | |
17 | // differs from endian representation size. | |
18 | ||
19 | // TODO: When a compiler supporting constexpr becomes available, try possible uses. | |
20 | ||
21 | #ifndef BOOST_ENDIAN_BUFFERS_HPP | |
22 | #define BOOST_ENDIAN_BUFFERS_HPP | |
23 | ||
24 | #if defined(_MSC_VER) | |
25 | # pragma warning(push) | |
26 | # pragma warning(disable:4365) // conversion ... signed/unsigned mismatch | |
27 | #endif | |
28 | ||
29 | #ifdef BOOST_ENDIAN_LOG | |
30 | # include <iostream> | |
31 | #endif | |
32 | ||
33 | #if defined(__BORLANDC__) || defined( __CODEGEARC__) | |
34 | # pragma pack(push, 1) | |
35 | #endif | |
36 | ||
37 | #include <boost/config.hpp> | |
38 | #include <boost/predef/detail/endian_compat.h> | |
39 | #include <boost/endian/conversion.hpp> | |
40 | #include <boost/type_traits/is_signed.hpp> | |
41 | #include <boost/cstdint.hpp> | |
42 | #include <boost/static_assert.hpp> | |
43 | #include <boost/core/scoped_enum.hpp> | |
44 | #include <iosfwd> | |
45 | #include <climits> | |
46 | ||
47 | # if CHAR_BIT != 8 | |
48 | # error Platforms with CHAR_BIT != 8 are not supported | |
49 | # endif | |
50 | ||
51 | # ifdef BOOST_NO_CXX11_DEFAULTED_FUNCTIONS | |
52 | # define BOOST_ENDIAN_DEFAULT_CONSTRUCT {} // C++03 | |
53 | # else | |
54 | # define BOOST_ENDIAN_DEFAULT_CONSTRUCT = default; // C++0x | |
55 | # endif | |
56 | ||
57 | # if defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && defined(BOOST_ENDIAN_FORCE_PODNESS) | |
58 | # define BOOST_ENDIAN_NO_CTORS | |
59 | # endif | |
60 | ||
61 | //---------------------------------- synopsis ----------------------------------------// | |
62 | ||
63 | namespace boost | |
64 | { | |
65 | namespace endian | |
66 | { | |
67 | ||
68 | BOOST_SCOPED_ENUM_START(align) | |
69 | {no, yes | |
70 | # ifdef BOOST_ENDIAN_DEPRECATED_NAMES | |
71 | , unaligned = no, aligned = yes | |
72 | # endif | |
73 | }; BOOST_SCOPED_ENUM_END | |
74 | ||
75 | template <BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits, | |
76 | BOOST_SCOPED_ENUM(align) A = align::no> | |
77 | class endian_buffer; | |
78 | ||
79 | // aligned big endian signed integer buffers | |
80 | typedef endian_buffer<order::big, int8_t, 8, align::yes> big_int8_buf_at; | |
81 | typedef endian_buffer<order::big, int16_t, 16, align::yes> big_int16_buf_at; | |
82 | typedef endian_buffer<order::big, int32_t, 32, align::yes> big_int32_buf_at; | |
83 | typedef endian_buffer<order::big, int64_t, 64, align::yes> big_int64_buf_at; | |
84 | ||
85 | // aligned big endian unsigned integer buffers | |
86 | typedef endian_buffer<order::big, uint8_t, 8, align::yes> big_uint8_buf_at; | |
87 | typedef endian_buffer<order::big, uint16_t, 16, align::yes> big_uint16_buf_at; | |
88 | typedef endian_buffer<order::big, uint32_t, 32, align::yes> big_uint32_buf_at; | |
89 | typedef endian_buffer<order::big, uint64_t, 64, align::yes> big_uint64_buf_at; | |
90 | ||
91 | // aligned little endian signed integer buffers | |
92 | typedef endian_buffer<order::little, int8_t, 8, align::yes> little_int8_buf_at; | |
93 | typedef endian_buffer<order::little, int16_t, 16, align::yes> little_int16_buf_at; | |
94 | typedef endian_buffer<order::little, int32_t, 32, align::yes> little_int32_buf_at; | |
95 | typedef endian_buffer<order::little, int64_t, 64, align::yes> little_int64_buf_at; | |
96 | ||
97 | // aligned little endian unsigned integer buffers | |
98 | typedef endian_buffer<order::little, uint8_t, 8, align::yes> little_uint8_buf_at; | |
99 | typedef endian_buffer<order::little, uint16_t, 16, align::yes> little_uint16_buf_at; | |
100 | typedef endian_buffer<order::little, uint32_t, 32, align::yes> little_uint32_buf_at; | |
101 | typedef endian_buffer<order::little, uint64_t, 64, align::yes> little_uint64_buf_at; | |
102 | ||
103 | // aligned native endian typedefs are not provided because | |
104 | // <cstdint> types are superior for this use case | |
105 | ||
106 | // unaligned big endian signed integer buffers | |
107 | typedef endian_buffer<order::big, int_least8_t, 8> big_int8_buf_t; | |
108 | typedef endian_buffer<order::big, int_least16_t, 16> big_int16_buf_t; | |
109 | typedef endian_buffer<order::big, int_least32_t, 24> big_int24_buf_t; | |
110 | typedef endian_buffer<order::big, int_least32_t, 32> big_int32_buf_t; | |
111 | typedef endian_buffer<order::big, int_least64_t, 40> big_int40_buf_t; | |
112 | typedef endian_buffer<order::big, int_least64_t, 48> big_int48_buf_t; | |
113 | typedef endian_buffer<order::big, int_least64_t, 56> big_int56_buf_t; | |
114 | typedef endian_buffer<order::big, int_least64_t, 64> big_int64_buf_t; | |
115 | ||
116 | // unaligned big endian unsigned integer buffers | |
117 | typedef endian_buffer<order::big, uint_least8_t, 8> big_uint8_buf_t; | |
118 | typedef endian_buffer<order::big, uint_least16_t, 16> big_uint16_buf_t; | |
119 | typedef endian_buffer<order::big, uint_least32_t, 24> big_uint24_buf_t; | |
120 | typedef endian_buffer<order::big, uint_least32_t, 32> big_uint32_buf_t; | |
121 | typedef endian_buffer<order::big, uint_least64_t, 40> big_uint40_buf_t; | |
122 | typedef endian_buffer<order::big, uint_least64_t, 48> big_uint48_buf_t; | |
123 | typedef endian_buffer<order::big, uint_least64_t, 56> big_uint56_buf_t; | |
124 | typedef endian_buffer<order::big, uint_least64_t, 64> big_uint64_buf_t; | |
125 | ||
126 | // unaligned little endian signed integer buffers | |
127 | typedef endian_buffer<order::little, int_least8_t, 8> little_int8_buf_t; | |
128 | typedef endian_buffer<order::little, int_least16_t, 16> little_int16_buf_t; | |
129 | typedef endian_buffer<order::little, int_least32_t, 24> little_int24_buf_t; | |
130 | typedef endian_buffer<order::little, int_least32_t, 32> little_int32_buf_t; | |
131 | typedef endian_buffer<order::little, int_least64_t, 40> little_int40_buf_t; | |
132 | typedef endian_buffer<order::little, int_least64_t, 48> little_int48_buf_t; | |
133 | typedef endian_buffer<order::little, int_least64_t, 56> little_int56_buf_t; | |
134 | typedef endian_buffer<order::little, int_least64_t, 64> little_int64_buf_t; | |
135 | ||
136 | // unaligned little endian unsigned integer buffers | |
137 | typedef endian_buffer<order::little, uint_least8_t, 8> little_uint8_buf_t; | |
138 | typedef endian_buffer<order::little, uint_least16_t, 16> little_uint16_buf_t; | |
139 | typedef endian_buffer<order::little, uint_least32_t, 24> little_uint24_buf_t; | |
140 | typedef endian_buffer<order::little, uint_least32_t, 32> little_uint32_buf_t; | |
141 | typedef endian_buffer<order::little, uint_least64_t, 40> little_uint40_buf_t; | |
142 | typedef endian_buffer<order::little, uint_least64_t, 48> little_uint48_buf_t; | |
143 | typedef endian_buffer<order::little, uint_least64_t, 56> little_uint56_buf_t; | |
144 | typedef endian_buffer<order::little, uint_least64_t, 64> little_uint64_buf_t; | |
145 | ||
146 | # ifdef BOOST_BIG_ENDIAN | |
147 | // unaligned native endian signed integer buffers | |
148 | typedef big_int8_buf_t native_int8_buf_t; | |
149 | typedef big_int16_buf_t native_int16_buf_t; | |
150 | typedef big_int24_buf_t native_int24_buf_t; | |
151 | typedef big_int32_buf_t native_int32_buf_t; | |
152 | typedef big_int40_buf_t native_int40_buf_t; | |
153 | typedef big_int48_buf_t native_int48_buf_t; | |
154 | typedef big_int56_buf_t native_int56_buf_t; | |
155 | typedef big_int64_buf_t native_int64_buf_t; | |
156 | ||
157 | // unaligned native endian unsigned integer buffers | |
158 | typedef big_uint8_buf_t native_uint8_buf_t; | |
159 | typedef big_uint16_buf_t native_uint16_buf_t; | |
160 | typedef big_uint24_buf_t native_uint24_buf_t; | |
161 | typedef big_uint32_buf_t native_uint32_buf_t; | |
162 | typedef big_uint40_buf_t native_uint40_buf_t; | |
163 | typedef big_uint48_buf_t native_uint48_buf_t; | |
164 | typedef big_uint56_buf_t native_uint56_buf_t; | |
165 | typedef big_uint64_buf_t native_uint64_buf_t; | |
166 | # else | |
167 | // unaligned native endian signed integer buffers | |
168 | typedef little_int8_buf_t native_int8_buf_t; | |
169 | typedef little_int16_buf_t native_int16_buf_t; | |
170 | typedef little_int24_buf_t native_int24_buf_t; | |
171 | typedef little_int32_buf_t native_int32_buf_t; | |
172 | typedef little_int40_buf_t native_int40_buf_t; | |
173 | typedef little_int48_buf_t native_int48_buf_t; | |
174 | typedef little_int56_buf_t native_int56_buf_t; | |
175 | typedef little_int64_buf_t native_int64_buf_t; | |
176 | ||
177 | // unaligned native endian unsigned integer buffers | |
178 | typedef little_uint8_buf_t native_uint8_buf_t; | |
179 | typedef little_uint16_buf_t native_uint16_buf_t; | |
180 | typedef little_uint24_buf_t native_uint24_buf_t; | |
181 | typedef little_uint32_buf_t native_uint32_buf_t; | |
182 | typedef little_uint40_buf_t native_uint40_buf_t; | |
183 | typedef little_uint48_buf_t native_uint48_buf_t; | |
184 | typedef little_uint56_buf_t native_uint56_buf_t; | |
185 | typedef little_uint64_buf_t native_uint64_buf_t; | |
186 | # endif | |
187 | ||
188 | // Stream inserter | |
189 | template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T, | |
190 | std::size_t n_bits, BOOST_SCOPED_ENUM(align) A> | |
191 | std::basic_ostream<charT, traits>& | |
192 | operator<<(std::basic_ostream<charT, traits>& os, | |
193 | const endian_buffer<Order, T, n_bits, A>& x) | |
194 | { | |
195 | return os << x.value(); | |
196 | } | |
197 | ||
198 | // Stream extractor | |
199 | template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T, | |
200 | std::size_t n_bits, BOOST_SCOPED_ENUM(align) A> | |
201 | std::basic_istream<charT, traits>& | |
202 | operator>>(std::basic_istream<charT, traits>& is, | |
203 | endian_buffer<Order, T, n_bits, A>& x) | |
204 | { | |
205 | T i; | |
206 | if (is >> i) | |
207 | x = i; | |
208 | return is; | |
209 | } | |
210 | ||
211 | //---------------------------------- end synopsis ------------------------------------// | |
212 | ||
213 | namespace detail | |
214 | { | |
215 | ||
216 | // Unrolled loops for loading and storing streams of bytes. | |
217 | ||
218 | template <typename T, std::size_t n_bytes, | |
219 | bool sign=boost::is_signed<T>::value > | |
220 | struct unrolled_byte_loops | |
221 | { | |
222 | typedef unrolled_byte_loops<T, n_bytes - 1, sign> next; | |
223 | ||
224 | static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT | |
225 | { return static_cast<T>(*(bytes - 1) | (next::load_big(bytes - 1) << 8)); } | |
226 | static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT | |
227 | { return static_cast<T>(*bytes | (next::load_little(bytes + 1) << 8)); } | |
228 | ||
229 | static void store_big(char* bytes, T value) BOOST_NOEXCEPT | |
230 | { | |
231 | *(bytes - 1) = static_cast<char>(value); | |
232 | next::store_big(bytes - 1, static_cast<T>(value >> 8)); | |
233 | } | |
234 | static void store_little(char* bytes, T value) BOOST_NOEXCEPT | |
235 | { | |
236 | *bytes = static_cast<char>(value); | |
237 | next::store_little(bytes + 1, static_cast<T>(value >> 8)); | |
238 | } | |
239 | }; | |
240 | ||
241 | template <typename T> | |
242 | struct unrolled_byte_loops<T, 1, false> | |
243 | { | |
244 | static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT | |
245 | { return *(bytes - 1); } | |
246 | static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT | |
247 | { return *bytes; } | |
248 | static void store_big(char* bytes, T value) BOOST_NOEXCEPT | |
249 | { *(bytes - 1) = static_cast<char>(value); } | |
250 | static void store_little(char* bytes, T value) BOOST_NOEXCEPT | |
251 | { *bytes = static_cast<char>(value); } | |
252 | ||
253 | }; | |
254 | ||
255 | template <typename T> | |
256 | struct unrolled_byte_loops<T, 1, true> | |
257 | { | |
258 | static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT | |
259 | { return *reinterpret_cast<const signed char*>(bytes - 1); } | |
260 | static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT | |
261 | { return *reinterpret_cast<const signed char*>(bytes); } | |
262 | static void store_big(char* bytes, T value) BOOST_NOEXCEPT | |
263 | { *(bytes - 1) = static_cast<char>(value); } | |
264 | static void store_little(char* bytes, T value) BOOST_NOEXCEPT | |
265 | { *bytes = static_cast<char>(value); } | |
266 | }; | |
267 | ||
268 | template <typename T, std::size_t n_bytes> | |
269 | inline | |
270 | T load_big_endian(const void* bytes) BOOST_NOEXCEPT | |
271 | { | |
272 | return unrolled_byte_loops<T, n_bytes>::load_big | |
273 | (static_cast<const unsigned char*>(bytes) + n_bytes); | |
274 | } | |
275 | ||
276 | template <typename T, std::size_t n_bytes> | |
277 | inline | |
278 | T load_little_endian(const void* bytes) BOOST_NOEXCEPT | |
279 | { | |
280 | # if defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86) | |
281 | // On x86 (which is little endian), unaligned loads are permitted | |
282 | if (sizeof(T) == n_bytes) // GCC 4.9, VC++ 14.0, and probably others, elide this | |
283 | // test and generate code only for the applicable return | |
284 | // case since sizeof(T) and n_bytes are known at compile | |
285 | // time. | |
286 | { | |
287 | return *reinterpret_cast<T const *>(bytes); | |
288 | } | |
289 | # endif | |
290 | return unrolled_byte_loops<T, n_bytes>::load_little | |
291 | (static_cast<const unsigned char*>(bytes)); | |
292 | } | |
293 | ||
294 | template <typename T, std::size_t n_bytes> | |
295 | inline | |
296 | void store_big_endian(void* bytes, T value) BOOST_NOEXCEPT | |
297 | { | |
298 | unrolled_byte_loops<T, n_bytes>::store_big | |
299 | (static_cast<char*>(bytes) + n_bytes, value); | |
300 | } | |
301 | ||
302 | template <typename T, std::size_t n_bytes> | |
303 | inline | |
304 | void store_little_endian(void* bytes, T value) BOOST_NOEXCEPT | |
305 | { | |
306 | # if defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86) | |
307 | // On x86 (which is little endian), unaligned stores are permitted | |
308 | if (sizeof(T) == n_bytes) // GCC 4.9, VC++ 14.0, and probably others, elide this | |
309 | // test and generate code only for the applicable return | |
310 | // case since sizeof(T) and n_bytes are known at compile | |
311 | // time. | |
312 | { | |
313 | *reinterpret_cast<T *>(bytes) = value; | |
314 | return; | |
315 | } | |
316 | # endif | |
317 | unrolled_byte_loops<T, n_bytes>::store_little | |
318 | (static_cast<char*>(bytes), value); | |
319 | } | |
320 | ||
321 | } // namespace detail | |
322 | ||
323 | # ifdef BOOST_ENDIAN_LOG | |
324 | bool endian_log(true); | |
325 | # endif | |
326 | ||
327 | // endian_buffer class template specializations --------------------------------------// | |
328 | ||
329 | // Specializations that represent unaligned bytes. | |
330 | // Taking an integer type as a parameter provides a nice way to pass both | |
331 | // the size and signedness of the desired integer and get the appropriate | |
332 | // corresponding integer type for the interface. | |
333 | ||
334 | // Q: Should endian_buffer supply "value_type operator value_type() const noexcept"? | |
335 | // A: No. The rationale for endian_buffers is to prevent high-cost hidden | |
336 | // conversions. If an implicit conversion operator is supplied, hidden conversions | |
337 | // can occur. | |
338 | ||
339 | // unaligned big endian_buffer specialization | |
340 | template <typename T, std::size_t n_bits> | |
341 | class endian_buffer< order::big, T, n_bits, align::no > | |
342 | { | |
343 | BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits ); | |
344 | public: | |
345 | typedef T value_type; | |
346 | # ifndef BOOST_ENDIAN_NO_CTORS | |
347 | endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT | |
348 | explicit endian_buffer(T val) BOOST_NOEXCEPT | |
349 | { | |
350 | # ifdef BOOST_ENDIAN_LOG | |
351 | if ( endian_log ) | |
352 | std::cout << "big, unaligned, " | |
353 | << n_bits << "-bits, construct(" << val << ")\n"; | |
354 | # endif | |
355 | detail::store_big_endian<T, n_bits/8>(m_value, val); | |
356 | } | |
357 | # endif | |
358 | endian_buffer & operator=(T val) BOOST_NOEXCEPT | |
359 | { | |
360 | # ifdef BOOST_ENDIAN_LOG | |
361 | if (endian_log) | |
362 | std::cout << "big, unaligned, " << n_bits << "-bits, assign(" << val << ")\n"; | |
363 | # endif | |
364 | detail::store_big_endian<T, n_bits/8>(m_value, val); | |
365 | return *this; | |
366 | } | |
367 | value_type value() const BOOST_NOEXCEPT | |
368 | { | |
369 | # ifdef BOOST_ENDIAN_LOG | |
370 | if ( endian_log ) | |
371 | std::cout << "big, unaligned, " << n_bits << "-bits, convert(" | |
372 | << detail::load_big_endian<T, n_bits/8>(m_value) << ")\n"; | |
373 | # endif | |
374 | return detail::load_big_endian<T, n_bits/8>(m_value); | |
375 | } | |
376 | const char* data() const BOOST_NOEXCEPT { return m_value; } | |
377 | protected: | |
378 | char m_value[n_bits/8]; | |
379 | }; | |
380 | ||
381 | // unaligned little endian_buffer specialization | |
382 | template <typename T, std::size_t n_bits> | |
383 | class endian_buffer< order::little, T, n_bits, align::no > | |
384 | { | |
385 | BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits ); | |
386 | public: | |
387 | typedef T value_type; | |
388 | # ifndef BOOST_ENDIAN_NO_CTORS | |
389 | endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT | |
390 | explicit endian_buffer(T val) BOOST_NOEXCEPT | |
391 | { | |
392 | # ifdef BOOST_ENDIAN_LOG | |
393 | if ( endian_log ) | |
394 | std::cout << "little, unaligned, " << n_bits << "-bits, construct(" | |
395 | << val << ")\n"; | |
396 | # endif | |
397 | detail::store_little_endian<T, n_bits/8>(m_value, val); | |
398 | } | |
399 | # endif | |
400 | endian_buffer & operator=(T val) BOOST_NOEXCEPT | |
401 | { detail::store_little_endian<T, n_bits/8>(m_value, val); return *this; } | |
402 | value_type value() const BOOST_NOEXCEPT | |
403 | { | |
404 | # ifdef BOOST_ENDIAN_LOG | |
405 | if ( endian_log ) | |
406 | std::cout << "little, unaligned, " << n_bits << "-bits, convert(" | |
407 | << detail::load_little_endian<T, n_bits/8>(m_value) << ")\n"; | |
408 | # endif | |
409 | return detail::load_little_endian<T, n_bits/8>(m_value); | |
410 | } | |
411 | const char* data() const BOOST_NOEXCEPT { return m_value; } | |
412 | protected: | |
413 | char m_value[n_bits/8]; | |
414 | }; | |
415 | ||
416 | // align::yes specializations; only n_bits == 16/32/64 supported | |
417 | ||
418 | // aligned big endian_buffer specialization | |
419 | template <typename T, std::size_t n_bits> | |
420 | class endian_buffer<order::big, T, n_bits, align::yes> | |
421 | { | |
422 | BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits ); | |
423 | BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 ); | |
424 | public: | |
425 | typedef T value_type; | |
426 | # ifndef BOOST_ENDIAN_NO_CTORS | |
427 | endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT | |
428 | explicit endian_buffer(T val) BOOST_NOEXCEPT | |
429 | { | |
430 | # ifdef BOOST_ENDIAN_LOG | |
431 | if ( endian_log ) | |
432 | std::cout << "big, aligned, " << n_bits | |
433 | << "-bits, construct(" << val << ")\n"; | |
434 | # endif | |
435 | m_value = ::boost::endian::native_to_big(val); | |
436 | } | |
437 | ||
438 | # endif | |
439 | endian_buffer& operator=(T val) BOOST_NOEXCEPT | |
440 | { | |
441 | m_value = ::boost::endian::native_to_big(val); | |
442 | return *this; | |
443 | } | |
444 | //operator value_type() const BOOST_NOEXCEPT | |
445 | //{ | |
446 | // return ::boost::endian::big_to_native(m_value); | |
447 | //} | |
448 | value_type value() const BOOST_NOEXCEPT | |
449 | { | |
450 | # ifdef BOOST_ENDIAN_LOG | |
451 | if ( endian_log ) | |
452 | std::cout << "big, aligned, " << n_bits << "-bits, convert(" | |
453 | << ::boost::endian::big_to_native(m_value) << ")\n"; | |
454 | # endif | |
455 | return ::boost::endian::big_to_native(m_value); | |
456 | } | |
457 | const char* data() const BOOST_NOEXCEPT | |
458 | {return reinterpret_cast<const char*>(&m_value);} | |
459 | protected: | |
460 | T m_value; | |
461 | }; | |
462 | ||
463 | // aligned little endian_buffer specialization | |
464 | template <typename T, std::size_t n_bits> | |
465 | class endian_buffer<order::little, T, n_bits, align::yes> | |
466 | { | |
467 | BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits ); | |
468 | BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 ); | |
469 | public: | |
470 | typedef T value_type; | |
471 | # ifndef BOOST_ENDIAN_NO_CTORS | |
472 | endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT | |
473 | explicit endian_buffer(T val) BOOST_NOEXCEPT | |
474 | { | |
475 | # ifdef BOOST_ENDIAN_LOG | |
476 | if ( endian_log ) | |
477 | std::cout << "little, aligned, " << n_bits | |
478 | << "-bits, construct(" << val << ")\n"; | |
479 | # endif | |
480 | m_value = ::boost::endian::native_to_little(val); | |
481 | } | |
482 | ||
483 | # endif | |
484 | endian_buffer& operator=(T val) BOOST_NOEXCEPT | |
485 | { | |
486 | m_value = ::boost::endian::native_to_little(val); | |
487 | return *this; | |
488 | } | |
489 | value_type value() const BOOST_NOEXCEPT | |
490 | { | |
491 | # ifdef BOOST_ENDIAN_LOG | |
492 | if ( endian_log ) | |
493 | std::cout << "little, aligned, " << n_bits << "-bits, convert(" | |
494 | << ::boost::endian::little_to_native(m_value) << ")\n"; | |
495 | # endif | |
496 | return ::boost::endian::little_to_native(m_value); | |
497 | } | |
498 | const char* data() const BOOST_NOEXCEPT | |
499 | {return reinterpret_cast<const char*>(&m_value);} | |
500 | protected: | |
501 | T m_value; | |
502 | }; | |
503 | ||
504 | } // namespace endian | |
505 | } // namespace boost | |
506 | ||
507 | #if defined(__BORLANDC__) || defined( __CODEGEARC__) | |
508 | # pragma pack(pop) | |
509 | #endif | |
510 | ||
511 | #if defined(_MSC_VER) | |
512 | # pragma warning(pop) | |
513 | #endif | |
514 | ||
515 | #endif // BOOST_ENDIAN_BUFFERS_HPP |