371 lines
13 KiB
C++
371 lines
13 KiB
C++
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// boost/endian/arithmetic.hpp -------------------------------------------------------//
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// (C) Copyright Darin Adler 2000
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// (C) Copyright Beman Dawes 2006, 2009, 2014
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// (C) Copyright Peter Dimov 2019
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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// See library home page at http://www.boost.org/libs/endian
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//--------------------------------------------------------------------------------------//
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// Original design developed by Darin Adler based on classes developed by Mark
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// Borgerding. Four original class templates were combined into a single endian
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// class template by Beman Dawes, who also added the unrolled_byte_loops sign
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// partial specialization to correctly extend the sign when cover integer size
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// differs from endian representation size.
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// TODO: When a compiler supporting constexpr becomes available, try possible uses.
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#ifndef BOOST_ENDIAN_ARITHMETIC_HPP
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#define BOOST_ENDIAN_ARITHMETIC_HPP
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable:4365) // conversion ... signed/unsigned mismatch
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#endif
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#include <boost/endian/buffers.hpp>
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#include <boost/core/scoped_enum.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/config.hpp>
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#include <boost/config/workaround.hpp>
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#include <iosfwd>
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#include <climits>
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#if defined(BOOST_BORLANDC) || defined(BOOST_CODEGEARC)
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# pragma pack(push, 1)
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#endif
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# if CHAR_BIT != 8
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# error Platforms with CHAR_BIT != 8 are not supported
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# endif
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# ifdef BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
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# define BOOST_ENDIAN_DEFAULT_CONSTRUCT {} // C++03
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# else
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# define BOOST_ENDIAN_DEFAULT_CONSTRUCT = default; // C++0x
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# endif
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// g++ pre-4.6 does not support unrestricted unions, but we have no Config macro for that
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# if (defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || BOOST_WORKAROUND(BOOST_GCC, < 40600)) && defined(BOOST_ENDIAN_FORCE_PODNESS)
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# define BOOST_ENDIAN_NO_CTORS
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# endif
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# ifndef BOOST_ENDIAN_EXPLICIT_CTORS
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# define BOOST_ENDIAN_EXPLICIT_OPT
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# else
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# define BOOST_ENDIAN_EXPLICIT_OPT explicit
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# endif
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//---------------------------------- synopsis ----------------------------------------//
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namespace boost
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{
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namespace endian
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{
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template <BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits,
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BOOST_SCOPED_ENUM(align) Align = align::no>
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class endian_arithmetic;
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// big endian signed integer aligned types
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typedef endian_arithmetic<order::big, int8_t, 8, align::yes> big_int8_at;
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typedef endian_arithmetic<order::big, int16_t, 16, align::yes> big_int16_at;
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typedef endian_arithmetic<order::big, int32_t, 32, align::yes> big_int32_at;
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typedef endian_arithmetic<order::big, int64_t, 64, align::yes> big_int64_at;
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// big endian unsigned integer aligned types
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typedef endian_arithmetic<order::big, uint8_t, 8, align::yes> big_uint8_at;
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typedef endian_arithmetic<order::big, uint16_t, 16, align::yes> big_uint16_at;
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typedef endian_arithmetic<order::big, uint32_t, 32, align::yes> big_uint32_at;
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typedef endian_arithmetic<order::big, uint64_t, 64, align::yes> big_uint64_at;
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// little endian signed integer aligned types
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typedef endian_arithmetic<order::little, int8_t, 8, align::yes> little_int8_at;
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typedef endian_arithmetic<order::little, int16_t, 16, align::yes> little_int16_at;
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typedef endian_arithmetic<order::little, int32_t, 32, align::yes> little_int32_at;
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typedef endian_arithmetic<order::little, int64_t, 64, align::yes> little_int64_at;
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// little endian unsigned integer aligned types
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typedef endian_arithmetic<order::little, uint8_t, 8, align::yes> little_uint8_at;
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typedef endian_arithmetic<order::little, uint16_t, 16, align::yes> little_uint16_at;
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typedef endian_arithmetic<order::little, uint32_t, 32, align::yes> little_uint32_at;
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typedef endian_arithmetic<order::little, uint64_t, 64, align::yes> little_uint64_at;
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// aligned floating point types
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typedef endian_arithmetic<order::big, float, 32, align::yes> big_float32_at;
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typedef endian_arithmetic<order::big, double, 64, align::yes> big_float64_at;
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typedef endian_arithmetic<order::little, float, 32, align::yes> little_float32_at;
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typedef endian_arithmetic<order::little, double, 64, align::yes> little_float64_at;
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// aligned native endian typedefs are not provided because
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// <cstdint> types are superior for this use case
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// big endian signed integer unaligned types
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typedef endian_arithmetic<order::big, int_least8_t, 8> big_int8_t;
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typedef endian_arithmetic<order::big, int_least16_t, 16> big_int16_t;
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typedef endian_arithmetic<order::big, int_least32_t, 24> big_int24_t;
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typedef endian_arithmetic<order::big, int_least32_t, 32> big_int32_t;
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typedef endian_arithmetic<order::big, int_least64_t, 40> big_int40_t;
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typedef endian_arithmetic<order::big, int_least64_t, 48> big_int48_t;
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typedef endian_arithmetic<order::big, int_least64_t, 56> big_int56_t;
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typedef endian_arithmetic<order::big, int_least64_t, 64> big_int64_t;
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// big endian unsigned integer unaligned types
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typedef endian_arithmetic<order::big, uint_least8_t, 8> big_uint8_t;
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typedef endian_arithmetic<order::big, uint_least16_t, 16> big_uint16_t;
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typedef endian_arithmetic<order::big, uint_least32_t, 24> big_uint24_t;
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typedef endian_arithmetic<order::big, uint_least32_t, 32> big_uint32_t;
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typedef endian_arithmetic<order::big, uint_least64_t, 40> big_uint40_t;
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typedef endian_arithmetic<order::big, uint_least64_t, 48> big_uint48_t;
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typedef endian_arithmetic<order::big, uint_least64_t, 56> big_uint56_t;
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typedef endian_arithmetic<order::big, uint_least64_t, 64> big_uint64_t;
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// little endian signed integer unaligned types
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typedef endian_arithmetic<order::little, int_least8_t, 8> little_int8_t;
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typedef endian_arithmetic<order::little, int_least16_t, 16> little_int16_t;
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typedef endian_arithmetic<order::little, int_least32_t, 24> little_int24_t;
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typedef endian_arithmetic<order::little, int_least32_t, 32> little_int32_t;
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typedef endian_arithmetic<order::little, int_least64_t, 40> little_int40_t;
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typedef endian_arithmetic<order::little, int_least64_t, 48> little_int48_t;
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typedef endian_arithmetic<order::little, int_least64_t, 56> little_int56_t;
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typedef endian_arithmetic<order::little, int_least64_t, 64> little_int64_t;
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// little endian unsigned integer unaligned types
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typedef endian_arithmetic<order::little, uint_least8_t, 8> little_uint8_t;
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typedef endian_arithmetic<order::little, uint_least16_t, 16> little_uint16_t;
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typedef endian_arithmetic<order::little, uint_least32_t, 24> little_uint24_t;
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typedef endian_arithmetic<order::little, uint_least32_t, 32> little_uint32_t;
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typedef endian_arithmetic<order::little, uint_least64_t, 40> little_uint40_t;
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typedef endian_arithmetic<order::little, uint_least64_t, 48> little_uint48_t;
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typedef endian_arithmetic<order::little, uint_least64_t, 56> little_uint56_t;
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typedef endian_arithmetic<order::little, uint_least64_t, 64> little_uint64_t;
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// native endian signed integer unaligned types
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typedef endian_arithmetic<order::native, int_least8_t, 8> native_int8_t;
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typedef endian_arithmetic<order::native, int_least16_t, 16> native_int16_t;
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typedef endian_arithmetic<order::native, int_least32_t, 24> native_int24_t;
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typedef endian_arithmetic<order::native, int_least32_t, 32> native_int32_t;
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typedef endian_arithmetic<order::native, int_least64_t, 40> native_int40_t;
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typedef endian_arithmetic<order::native, int_least64_t, 48> native_int48_t;
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typedef endian_arithmetic<order::native, int_least64_t, 56> native_int56_t;
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typedef endian_arithmetic<order::native, int_least64_t, 64> native_int64_t;
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// native endian unsigned integer unaligned types
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typedef endian_arithmetic<order::native, uint_least8_t, 8> native_uint8_t;
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typedef endian_arithmetic<order::native, uint_least16_t, 16> native_uint16_t;
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typedef endian_arithmetic<order::native, uint_least32_t, 24> native_uint24_t;
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typedef endian_arithmetic<order::native, uint_least32_t, 32> native_uint32_t;
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typedef endian_arithmetic<order::native, uint_least64_t, 40> native_uint40_t;
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typedef endian_arithmetic<order::native, uint_least64_t, 48> native_uint48_t;
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typedef endian_arithmetic<order::native, uint_least64_t, 56> native_uint56_t;
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typedef endian_arithmetic<order::native, uint_least64_t, 64> native_uint64_t;
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// unaligned floating point types
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typedef endian_arithmetic<order::big, float, 32, align::no> big_float32_t;
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typedef endian_arithmetic<order::big, double, 64, align::no> big_float64_t;
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typedef endian_arithmetic<order::little, float, 32, align::no> little_float32_t;
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typedef endian_arithmetic<order::little, double, 64, align::no> little_float64_t;
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typedef endian_arithmetic<order::native, float, 32, align::no> native_float32_t;
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typedef endian_arithmetic<order::native, double, 64, align::no> native_float64_t;
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//---------------------------------- end synopsis ------------------------------------//
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template <BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits,
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BOOST_SCOPED_ENUM(align) Align>
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class endian_arithmetic
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{
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private:
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typedef endian_buffer<Order, T, n_bits, Align> buffer_type;
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#ifdef BOOST_ENDIAN_NO_CTORS
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public:
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#else
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private:
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#endif
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buffer_type buf_;
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public:
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typedef T value_type;
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#ifndef BOOST_ENDIAN_NO_CTORS
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endian_arithmetic() BOOST_ENDIAN_DEFAULT_CONSTRUCT
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BOOST_ENDIAN_EXPLICIT_OPT endian_arithmetic( T val ) BOOST_NOEXCEPT: buf_( val )
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{
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}
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#endif
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endian_arithmetic& operator=( T val ) BOOST_NOEXCEPT
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{
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buf_ = val;
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return *this;
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}
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value_type value() const BOOST_NOEXCEPT
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{
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return buf_.value();
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}
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unsigned char const * data() const BOOST_NOEXCEPT
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{
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return buf_.data();
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}
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unsigned char * data() BOOST_NOEXCEPT
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{
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return buf_.data();
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}
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operator value_type() const BOOST_NOEXCEPT
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{
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return this->value();
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}
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operator buffer_type& () BOOST_NOEXCEPT
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{
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return buf_;
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}
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operator buffer_type const& () BOOST_NOEXCEPT
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{
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return buf_;
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}
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// operators
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T operator+() const BOOST_NOEXCEPT
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{
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return this->value();
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}
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endian_arithmetic& operator+=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() + y );
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return *this;
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}
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endian_arithmetic& operator-=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() - y );
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return *this;
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}
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endian_arithmetic& operator*=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() * y );
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return *this;
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}
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endian_arithmetic& operator/=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() / y );
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return *this;
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}
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endian_arithmetic& operator%=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() % y );
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return *this;
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}
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endian_arithmetic& operator&=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() & y );
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return *this;
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}
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endian_arithmetic& operator|=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() | y );
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return *this;
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}
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endian_arithmetic& operator^=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() ^ y );
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return *this;
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}
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endian_arithmetic& operator<<=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() << y );
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return *this;
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}
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endian_arithmetic& operator>>=( T y ) BOOST_NOEXCEPT
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{
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*this = static_cast<T>( this->value() >> y );
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return *this;
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}
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endian_arithmetic& operator++() BOOST_NOEXCEPT
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{
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*this += 1;
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return *this;
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}
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endian_arithmetic& operator--() BOOST_NOEXCEPT
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{
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*this -= 1;
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return *this;
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}
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endian_arithmetic operator++(int) BOOST_NOEXCEPT
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{
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endian_arithmetic tmp( *this );
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*this += 1;
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return tmp;
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}
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endian_arithmetic operator--(int) BOOST_NOEXCEPT
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{
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endian_arithmetic tmp( *this );
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*this -= 1;
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return tmp;
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}
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template<class Ch, class Tr>
|
||
|
|
friend std::basic_ostream<Ch, Tr>&
|
||
|
|
operator<<( std::basic_ostream<Ch, Tr>& os, endian_arithmetic const& x )
|
||
|
|
{
|
||
|
|
return os << x.value();
|
||
|
|
}
|
||
|
|
|
||
|
|
template<class Ch, class Tr>
|
||
|
|
friend std::basic_istream<Ch, Tr>&
|
||
|
|
operator>>( std::basic_istream<Ch, Tr>& is, endian_arithmetic& x )
|
||
|
|
{
|
||
|
|
T i;
|
||
|
|
|
||
|
|
if( is >> i )
|
||
|
|
{
|
||
|
|
x = i;
|
||
|
|
}
|
||
|
|
|
||
|
|
return is;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace endian
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#if defined(BOOST_BORLANDC) || defined(BOOST_CODEGEARC)
|
||
|
|
# pragma pack(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(_MSC_VER)
|
||
|
|
# pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // BOOST_ENDIAN_ARITHMETIC_HPP
|