1 // boost/endian/buffers.hpp ----------------------------------------------------------//
3 // (C) Copyright Darin Adler 2000
4 // (C) Copyright Beman Dawes 2006, 2009, 2014
5 // (C) Copyright Peter Dimov 2019
7 // Distributed under the Boost Software License, Version 1.0.
8 // See http://www.boost.org/LICENSE_1_0.txt
10 // See library home page at http://www.boost.org/libs/endian
12 //--------------------------------------------------------------------------------------//
14 // Original design developed by Darin Adler based on classes developed by Mark
15 // Borgerding. Four original class templates were combined into a single endian
16 // class template by Beman Dawes, who also added the unrolled_byte_loops sign
17 // partial specialization to correctly extend the sign when cover integer size
18 // differs from endian representation size.
20 // TODO: When a compiler supporting constexpr becomes available, try possible uses.
22 #ifndef BOOST_ENDIAN_BUFFERS_HPP
23 #define BOOST_ENDIAN_BUFFERS_HPP
26 # pragma warning(push)
27 # pragma warning(disable: 4127) // conditional expression is constant
30 #include <boost/endian/detail/endian_store.hpp>
31 #include <boost/endian/detail/endian_load.hpp>
32 #include <boost/core/scoped_enum.hpp>
33 #include <boost/predef/other/endian.h>
34 #include <boost/static_assert.hpp>
35 #include <boost/cstdint.hpp>
36 #include <boost/config.hpp>
37 #include <boost/config/workaround.hpp>
42 #if defined(__BORLANDC__) || defined( __CODEGEARC__)
43 # pragma pack(push, 1)
47 # error Platforms with CHAR_BIT != 8 are not supported
50 # ifdef BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
51 # define BOOST_ENDIAN_DEFAULT_CONSTRUCT {} // C++03
53 # define BOOST_ENDIAN_DEFAULT_CONSTRUCT = default; // C++0x
56 // g++ pre-4.6 does not support unrestricted unions, but we have no Config macro for that
57 # if (defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || BOOST_WORKAROUND(BOOST_GCC, < 40600)) && defined(BOOST_ENDIAN_FORCE_PODNESS)
58 # define BOOST_ENDIAN_NO_CTORS
61 //---------------------------------- synopsis ----------------------------------------//
68 BOOST_SCOPED_ENUM_START(align)
70 # ifdef BOOST_ENDIAN_DEPRECATED_NAMES
71 , unaligned = no, aligned = yes
73 }; BOOST_SCOPED_ENUM_END
75 template <BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits,
76 BOOST_SCOPED_ENUM(align) A = align::no>
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;
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;
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;
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;
103 // aligned floating point buffers
104 typedef endian_buffer<order::big, float, 32, align::yes> big_float32_buf_at;
105 typedef endian_buffer<order::big, double, 64, align::yes> big_float64_buf_at;
106 typedef endian_buffer<order::little, float, 32, align::yes> little_float32_buf_at;
107 typedef endian_buffer<order::little, double, 64, align::yes> little_float64_buf_at;
109 // aligned native endian typedefs are not provided because
110 // <cstdint> types are superior for this use case
112 // unaligned big endian signed integer buffers
113 typedef endian_buffer<order::big, int_least8_t, 8> big_int8_buf_t;
114 typedef endian_buffer<order::big, int_least16_t, 16> big_int16_buf_t;
115 typedef endian_buffer<order::big, int_least32_t, 24> big_int24_buf_t;
116 typedef endian_buffer<order::big, int_least32_t, 32> big_int32_buf_t;
117 typedef endian_buffer<order::big, int_least64_t, 40> big_int40_buf_t;
118 typedef endian_buffer<order::big, int_least64_t, 48> big_int48_buf_t;
119 typedef endian_buffer<order::big, int_least64_t, 56> big_int56_buf_t;
120 typedef endian_buffer<order::big, int_least64_t, 64> big_int64_buf_t;
122 // unaligned big endian unsigned integer buffers
123 typedef endian_buffer<order::big, uint_least8_t, 8> big_uint8_buf_t;
124 typedef endian_buffer<order::big, uint_least16_t, 16> big_uint16_buf_t;
125 typedef endian_buffer<order::big, uint_least32_t, 24> big_uint24_buf_t;
126 typedef endian_buffer<order::big, uint_least32_t, 32> big_uint32_buf_t;
127 typedef endian_buffer<order::big, uint_least64_t, 40> big_uint40_buf_t;
128 typedef endian_buffer<order::big, uint_least64_t, 48> big_uint48_buf_t;
129 typedef endian_buffer<order::big, uint_least64_t, 56> big_uint56_buf_t;
130 typedef endian_buffer<order::big, uint_least64_t, 64> big_uint64_buf_t;
132 // unaligned little endian signed integer buffers
133 typedef endian_buffer<order::little, int_least8_t, 8> little_int8_buf_t;
134 typedef endian_buffer<order::little, int_least16_t, 16> little_int16_buf_t;
135 typedef endian_buffer<order::little, int_least32_t, 24> little_int24_buf_t;
136 typedef endian_buffer<order::little, int_least32_t, 32> little_int32_buf_t;
137 typedef endian_buffer<order::little, int_least64_t, 40> little_int40_buf_t;
138 typedef endian_buffer<order::little, int_least64_t, 48> little_int48_buf_t;
139 typedef endian_buffer<order::little, int_least64_t, 56> little_int56_buf_t;
140 typedef endian_buffer<order::little, int_least64_t, 64> little_int64_buf_t;
142 // unaligned little endian unsigned integer buffers
143 typedef endian_buffer<order::little, uint_least8_t, 8> little_uint8_buf_t;
144 typedef endian_buffer<order::little, uint_least16_t, 16> little_uint16_buf_t;
145 typedef endian_buffer<order::little, uint_least32_t, 24> little_uint24_buf_t;
146 typedef endian_buffer<order::little, uint_least32_t, 32> little_uint32_buf_t;
147 typedef endian_buffer<order::little, uint_least64_t, 40> little_uint40_buf_t;
148 typedef endian_buffer<order::little, uint_least64_t, 48> little_uint48_buf_t;
149 typedef endian_buffer<order::little, uint_least64_t, 56> little_uint56_buf_t;
150 typedef endian_buffer<order::little, uint_least64_t, 64> little_uint64_buf_t;
152 # if BOOST_ENDIAN_BIG_BYTE
153 // unaligned native endian signed integer buffers
154 typedef big_int8_buf_t native_int8_buf_t;
155 typedef big_int16_buf_t native_int16_buf_t;
156 typedef big_int24_buf_t native_int24_buf_t;
157 typedef big_int32_buf_t native_int32_buf_t;
158 typedef big_int40_buf_t native_int40_buf_t;
159 typedef big_int48_buf_t native_int48_buf_t;
160 typedef big_int56_buf_t native_int56_buf_t;
161 typedef big_int64_buf_t native_int64_buf_t;
163 // unaligned native endian unsigned integer buffers
164 typedef big_uint8_buf_t native_uint8_buf_t;
165 typedef big_uint16_buf_t native_uint16_buf_t;
166 typedef big_uint24_buf_t native_uint24_buf_t;
167 typedef big_uint32_buf_t native_uint32_buf_t;
168 typedef big_uint40_buf_t native_uint40_buf_t;
169 typedef big_uint48_buf_t native_uint48_buf_t;
170 typedef big_uint56_buf_t native_uint56_buf_t;
171 typedef big_uint64_buf_t native_uint64_buf_t;
173 // unaligned native endian signed integer buffers
174 typedef little_int8_buf_t native_int8_buf_t;
175 typedef little_int16_buf_t native_int16_buf_t;
176 typedef little_int24_buf_t native_int24_buf_t;
177 typedef little_int32_buf_t native_int32_buf_t;
178 typedef little_int40_buf_t native_int40_buf_t;
179 typedef little_int48_buf_t native_int48_buf_t;
180 typedef little_int56_buf_t native_int56_buf_t;
181 typedef little_int64_buf_t native_int64_buf_t;
183 // unaligned native endian unsigned integer buffers
184 typedef little_uint8_buf_t native_uint8_buf_t;
185 typedef little_uint16_buf_t native_uint16_buf_t;
186 typedef little_uint24_buf_t native_uint24_buf_t;
187 typedef little_uint32_buf_t native_uint32_buf_t;
188 typedef little_uint40_buf_t native_uint40_buf_t;
189 typedef little_uint48_buf_t native_uint48_buf_t;
190 typedef little_uint56_buf_t native_uint56_buf_t;
191 typedef little_uint64_buf_t native_uint64_buf_t;
194 // unaligned floating point buffers
195 typedef endian_buffer<order::big, float, 32, align::no> big_float32_buf_t;
196 typedef endian_buffer<order::big, double, 64, align::no> big_float64_buf_t;
197 typedef endian_buffer<order::little, float, 32, align::no> little_float32_buf_t;
198 typedef endian_buffer<order::little, double, 64, align::no> little_float64_buf_t;
199 typedef endian_buffer<order::native, float, 32, align::no> native_float32_buf_t;
200 typedef endian_buffer<order::native, double, 64, align::no> native_float64_buf_t;
203 template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T,
204 std::size_t n_bits, BOOST_SCOPED_ENUM(align) A>
205 std::basic_ostream<charT, traits>&
206 operator<<(std::basic_ostream<charT, traits>& os,
207 const endian_buffer<Order, T, n_bits, A>& x)
209 return os << x.value();
213 template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T,
214 std::size_t n_bits, BOOST_SCOPED_ENUM(align) A>
215 std::basic_istream<charT, traits>&
216 operator>>(std::basic_istream<charT, traits>& is,
217 endian_buffer<Order, T, n_bits, A>& x)
225 //---------------------------------- end synopsis ------------------------------------//
227 // endian_buffer class template specializations --------------------------------------//
229 // Specializations that represent unaligned bytes.
230 // Taking an integer type as a parameter provides a nice way to pass both
231 // the size and signedness of the desired integer and get the appropriate
232 // corresponding integer type for the interface.
234 // Q: Should endian_buffer supply "value_type operator value_type() const noexcept"?
235 // A: No. The rationale for endian_buffers is to prevent high-cost hidden
236 // conversions. If an implicit conversion operator is supplied, hidden conversions
239 // unaligned endian_buffer specialization
241 template< BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits >
242 class endian_buffer<Order, T, n_bits, align::no>
246 BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
248 unsigned char value_[ n_bits / 8 ];
252 typedef T value_type;
254 #ifndef BOOST_ENDIAN_NO_CTORS
256 endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
258 explicit endian_buffer( T val ) BOOST_NOEXCEPT
260 boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
265 endian_buffer& operator=( T val ) BOOST_NOEXCEPT
267 boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
271 value_type value() const BOOST_NOEXCEPT
273 return boost::endian::endian_load<T, n_bits / 8, Order>( value_ );
276 unsigned char const * data() const BOOST_NOEXCEPT
281 unsigned char * data() BOOST_NOEXCEPT
287 // aligned specializations; only n_bits == 16/32/64 supported
289 // aligned endian_buffer specialization
291 template< BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits >
292 class endian_buffer<Order, T, n_bits, align::yes>
296 BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
297 BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
301 unsigned char value_[ n_bits / 8 ];
307 typedef T value_type;
309 #ifndef BOOST_ENDIAN_NO_CTORS
311 endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
313 explicit endian_buffer( T val ) BOOST_NOEXCEPT
315 boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
320 endian_buffer& operator=( T val ) BOOST_NOEXCEPT
322 boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
326 value_type value() const BOOST_NOEXCEPT
328 return boost::endian::endian_load<T, n_bits / 8, Order>( value_ );
331 unsigned char const * data() const BOOST_NOEXCEPT
336 unsigned char * data() BOOST_NOEXCEPT
342 // aligned native endian_buffer specialization
344 template< class T, std::size_t n_bits >
345 class endian_buffer<order::native, T, n_bits, align::yes>
349 BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
350 BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
356 typedef T value_type;
358 #ifndef BOOST_ENDIAN_NO_CTORS
360 endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
362 explicit endian_buffer( T val ) BOOST_NOEXCEPT: value_( val )
368 endian_buffer& operator=( T val ) BOOST_NOEXCEPT
374 value_type value() const BOOST_NOEXCEPT
379 unsigned char const * data() const BOOST_NOEXCEPT
381 return reinterpret_cast< unsigned char const* >( &value_ );
384 unsigned char * data() BOOST_NOEXCEPT
386 return reinterpret_cast< unsigned char* >( &value_ );
390 } // namespace endian
393 #if defined(__BORLANDC__) || defined( __CODEGEARC__)
397 #if defined(_MSC_VER)
398 # pragma warning(pop)
401 #endif // BOOST_ENDIAN_BUFFERS_HPP