381 lines
14 KiB
C++
381 lines
14 KiB
C++
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// boost/endian/buffers.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_BUFFERS_HPP
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#define BOOST_ENDIAN_BUFFERS_HPP
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable: 4127) // conditional expression is constant
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#endif
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#include <boost/endian/detail/endian_store.hpp>
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#include <boost/endian/detail/endian_load.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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#include <cstring>
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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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//---------------------------------- 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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BOOST_SCOPED_ENUM_START(align)
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{no, yes
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# ifdef BOOST_ENDIAN_DEPRECATED_NAMES
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, unaligned = no, aligned = yes
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# endif
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}; BOOST_SCOPED_ENUM_END
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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) A = align::no>
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class endian_buffer;
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// aligned big endian signed integer buffers
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typedef endian_buffer<order::big, int8_t, 8, align::yes> big_int8_buf_at;
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typedef endian_buffer<order::big, int16_t, 16, align::yes> big_int16_buf_at;
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typedef endian_buffer<order::big, int32_t, 32, align::yes> big_int32_buf_at;
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typedef endian_buffer<order::big, int64_t, 64, align::yes> big_int64_buf_at;
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// aligned big endian unsigned integer buffers
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typedef endian_buffer<order::big, uint8_t, 8, align::yes> big_uint8_buf_at;
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typedef endian_buffer<order::big, uint16_t, 16, align::yes> big_uint16_buf_at;
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typedef endian_buffer<order::big, uint32_t, 32, align::yes> big_uint32_buf_at;
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typedef endian_buffer<order::big, uint64_t, 64, align::yes> big_uint64_buf_at;
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// aligned little endian signed integer buffers
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typedef endian_buffer<order::little, int8_t, 8, align::yes> little_int8_buf_at;
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typedef endian_buffer<order::little, int16_t, 16, align::yes> little_int16_buf_at;
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typedef endian_buffer<order::little, int32_t, 32, align::yes> little_int32_buf_at;
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typedef endian_buffer<order::little, int64_t, 64, align::yes> little_int64_buf_at;
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// aligned little endian unsigned integer buffers
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typedef endian_buffer<order::little, uint8_t, 8, align::yes> little_uint8_buf_at;
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typedef endian_buffer<order::little, uint16_t, 16, align::yes> little_uint16_buf_at;
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typedef endian_buffer<order::little, uint32_t, 32, align::yes> little_uint32_buf_at;
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typedef endian_buffer<order::little, uint64_t, 64, align::yes> little_uint64_buf_at;
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// aligned floating point buffers
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typedef endian_buffer<order::big, float, 32, align::yes> big_float32_buf_at;
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typedef endian_buffer<order::big, double, 64, align::yes> big_float64_buf_at;
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typedef endian_buffer<order::little, float, 32, align::yes> little_float32_buf_at;
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typedef endian_buffer<order::little, double, 64, align::yes> little_float64_buf_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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// unaligned big endian signed integer buffers
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typedef endian_buffer<order::big, int_least8_t, 8> big_int8_buf_t;
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typedef endian_buffer<order::big, int_least16_t, 16> big_int16_buf_t;
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typedef endian_buffer<order::big, int_least32_t, 24> big_int24_buf_t;
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typedef endian_buffer<order::big, int_least32_t, 32> big_int32_buf_t;
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typedef endian_buffer<order::big, int_least64_t, 40> big_int40_buf_t;
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typedef endian_buffer<order::big, int_least64_t, 48> big_int48_buf_t;
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typedef endian_buffer<order::big, int_least64_t, 56> big_int56_buf_t;
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typedef endian_buffer<order::big, int_least64_t, 64> big_int64_buf_t;
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// unaligned big endian unsigned integer buffers
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typedef endian_buffer<order::big, uint_least8_t, 8> big_uint8_buf_t;
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typedef endian_buffer<order::big, uint_least16_t, 16> big_uint16_buf_t;
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typedef endian_buffer<order::big, uint_least32_t, 24> big_uint24_buf_t;
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typedef endian_buffer<order::big, uint_least32_t, 32> big_uint32_buf_t;
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typedef endian_buffer<order::big, uint_least64_t, 40> big_uint40_buf_t;
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typedef endian_buffer<order::big, uint_least64_t, 48> big_uint48_buf_t;
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typedef endian_buffer<order::big, uint_least64_t, 56> big_uint56_buf_t;
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typedef endian_buffer<order::big, uint_least64_t, 64> big_uint64_buf_t;
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// unaligned little endian signed integer buffers
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typedef endian_buffer<order::little, int_least8_t, 8> little_int8_buf_t;
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typedef endian_buffer<order::little, int_least16_t, 16> little_int16_buf_t;
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typedef endian_buffer<order::little, int_least32_t, 24> little_int24_buf_t;
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typedef endian_buffer<order::little, int_least32_t, 32> little_int32_buf_t;
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typedef endian_buffer<order::little, int_least64_t, 40> little_int40_buf_t;
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typedef endian_buffer<order::little, int_least64_t, 48> little_int48_buf_t;
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typedef endian_buffer<order::little, int_least64_t, 56> little_int56_buf_t;
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typedef endian_buffer<order::little, int_least64_t, 64> little_int64_buf_t;
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// unaligned little endian unsigned integer buffers
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typedef endian_buffer<order::little, uint_least8_t, 8> little_uint8_buf_t;
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typedef endian_buffer<order::little, uint_least16_t, 16> little_uint16_buf_t;
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typedef endian_buffer<order::little, uint_least32_t, 24> little_uint24_buf_t;
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typedef endian_buffer<order::little, uint_least32_t, 32> little_uint32_buf_t;
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typedef endian_buffer<order::little, uint_least64_t, 40> little_uint40_buf_t;
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typedef endian_buffer<order::little, uint_least64_t, 48> little_uint48_buf_t;
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typedef endian_buffer<order::little, uint_least64_t, 56> little_uint56_buf_t;
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typedef endian_buffer<order::little, uint_least64_t, 64> little_uint64_buf_t;
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// unaligned native endian signed integer buffers
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typedef endian_buffer<order::native, int_least8_t, 8> native_int8_buf_t;
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typedef endian_buffer<order::native, int_least16_t, 16> native_int16_buf_t;
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typedef endian_buffer<order::native, int_least32_t, 24> native_int24_buf_t;
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typedef endian_buffer<order::native, int_least32_t, 32> native_int32_buf_t;
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typedef endian_buffer<order::native, int_least64_t, 40> native_int40_buf_t;
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typedef endian_buffer<order::native, int_least64_t, 48> native_int48_buf_t;
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typedef endian_buffer<order::native, int_least64_t, 56> native_int56_buf_t;
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typedef endian_buffer<order::native, int_least64_t, 64> native_int64_buf_t;
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// unaligned native endian unsigned integer buffers
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typedef endian_buffer<order::native, uint_least8_t, 8> native_uint8_buf_t;
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typedef endian_buffer<order::native, uint_least16_t, 16> native_uint16_buf_t;
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typedef endian_buffer<order::native, uint_least32_t, 24> native_uint24_buf_t;
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typedef endian_buffer<order::native, uint_least32_t, 32> native_uint32_buf_t;
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typedef endian_buffer<order::native, uint_least64_t, 40> native_uint40_buf_t;
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typedef endian_buffer<order::native, uint_least64_t, 48> native_uint48_buf_t;
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typedef endian_buffer<order::native, uint_least64_t, 56> native_uint56_buf_t;
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typedef endian_buffer<order::native, uint_least64_t, 64> native_uint64_buf_t;
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// unaligned floating point buffers
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typedef endian_buffer<order::big, float, 32, align::no> big_float32_buf_t;
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typedef endian_buffer<order::big, double, 64, align::no> big_float64_buf_t;
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typedef endian_buffer<order::little, float, 32, align::no> little_float32_buf_t;
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typedef endian_buffer<order::little, double, 64, align::no> little_float64_buf_t;
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typedef endian_buffer<order::native, float, 32, align::no> native_float32_buf_t;
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typedef endian_buffer<order::native, double, 64, align::no> native_float64_buf_t;
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// Stream inserter
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template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T,
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std::size_t n_bits, BOOST_SCOPED_ENUM(align) A>
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std::basic_ostream<charT, traits>&
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operator<<(std::basic_ostream<charT, traits>& os,
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const endian_buffer<Order, T, n_bits, A>& x)
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{
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return os << x.value();
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}
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// Stream extractor
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template <class charT, class traits, BOOST_SCOPED_ENUM(order) Order, class T,
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std::size_t n_bits, BOOST_SCOPED_ENUM(align) A>
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std::basic_istream<charT, traits>&
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operator>>(std::basic_istream<charT, traits>& is,
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endian_buffer<Order, T, n_bits, A>& x)
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{
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T i;
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if (is >> i)
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x = i;
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return is;
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}
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//---------------------------------- end synopsis ------------------------------------//
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// endian_buffer class template specializations --------------------------------------//
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// Specializations that represent unaligned bytes.
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// Taking an integer type as a parameter provides a nice way to pass both
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// the size and signedness of the desired integer and get the appropriate
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// corresponding integer type for the interface.
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// Q: Should endian_buffer supply "value_type operator value_type() const noexcept"?
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// A: No. The rationale for endian_buffers is to prevent high-cost hidden
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// conversions. If an implicit conversion operator is supplied, hidden conversions
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// can occur.
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// unaligned endian_buffer specialization
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template< BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits >
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class endian_buffer<Order, T, n_bits, align::no>
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{
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#ifdef BOOST_ENDIAN_NO_CTORS
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public:
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#endif
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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unsigned char value_[ n_bits / 8 ];
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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_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
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explicit endian_buffer( T val ) BOOST_NOEXCEPT
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{
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boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
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}
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#endif
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endian_buffer& operator=( T val ) BOOST_NOEXCEPT
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{
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boost::endian::endian_store<T, n_bits / 8, Order>( value_, 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 boost::endian::endian_load<T, n_bits / 8, Order>( 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 value_;
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}
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unsigned char * data() BOOST_NOEXCEPT
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{
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return value_;
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}
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};
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// aligned specializations; only n_bits == 16/32/64 supported
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// aligned endian_buffer specialization
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template< BOOST_SCOPED_ENUM(order) Order, class T, std::size_t n_bits >
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class endian_buffer<Order, T, n_bits, align::yes>
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{
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private:
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
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union
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{
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unsigned char value_[ n_bits / 8 ];
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T align_;
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};
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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_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
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explicit endian_buffer( T val ) BOOST_NOEXCEPT
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{
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boost::endian::endian_store<T, n_bits / 8, Order>( value_, val );
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}
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#endif
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endian_buffer& operator=( T val ) BOOST_NOEXCEPT
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{
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boost::endian::endian_store<T, n_bits / 8, Order>( value_, 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 boost::endian::endian_load<T, n_bits / 8, Order>( 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 value_;
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}
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unsigned char * data() BOOST_NOEXCEPT
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{
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return value_;
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}
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};
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|
// aligned native endian_buffer specialization
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||
|
|
|
||
|
|
template< class T, std::size_t n_bits >
|
||
|
|
class endian_buffer<order::native, T, n_bits, align::yes>
|
||
|
|
{
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||
|
|
private:
|
||
|
|
|
||
|
|
BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
|
||
|
|
BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
|
||
|
|
|
||
|
|
T value_;
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
typedef T value_type;
|
||
|
|
|
||
|
|
#ifndef BOOST_ENDIAN_NO_CTORS
|
||
|
|
|
||
|
|
endian_buffer() BOOST_ENDIAN_DEFAULT_CONSTRUCT
|
||
|
|
|
||
|
|
explicit endian_buffer( T val ) BOOST_NOEXCEPT: value_( val )
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
endian_buffer& operator=( T val ) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
value_ = val;
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
value_type value() const BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return value_;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned char const * data() const BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return reinterpret_cast< unsigned char const* >( &value_ );
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned char * data() BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return reinterpret_cast< unsigned char* >( &value_ );
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // 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_BUFFERS_HPP
|