516 lines
20 KiB
C++
516 lines
20 KiB
C++
// 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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// 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:4365) // conversion ... signed/unsigned mismatch
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#endif
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#ifdef BOOST_ENDIAN_LOG
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# include <iostream>
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#endif
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#if defined(__BORLANDC__) || defined( __CODEGEARC__)
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# pragma pack(push, 1)
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#endif
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#include <boost/config.hpp>
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#include <boost/predef/detail/endian_compat.h>
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#include <boost/endian/conversion.hpp>
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#include <boost/type_traits/is_signed.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/core/scoped_enum.hpp>
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#include <iosfwd>
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#include <climits>
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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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# if defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && 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 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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# ifdef BOOST_BIG_ENDIAN
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// unaligned native endian signed integer buffers
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typedef big_int8_buf_t native_int8_buf_t;
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typedef big_int16_buf_t native_int16_buf_t;
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typedef big_int24_buf_t native_int24_buf_t;
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typedef big_int32_buf_t native_int32_buf_t;
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typedef big_int40_buf_t native_int40_buf_t;
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typedef big_int48_buf_t native_int48_buf_t;
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typedef big_int56_buf_t native_int56_buf_t;
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typedef big_int64_buf_t native_int64_buf_t;
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// unaligned native endian unsigned integer buffers
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typedef big_uint8_buf_t native_uint8_buf_t;
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typedef big_uint16_buf_t native_uint16_buf_t;
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typedef big_uint24_buf_t native_uint24_buf_t;
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typedef big_uint32_buf_t native_uint32_buf_t;
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typedef big_uint40_buf_t native_uint40_buf_t;
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typedef big_uint48_buf_t native_uint48_buf_t;
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typedef big_uint56_buf_t native_uint56_buf_t;
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typedef big_uint64_buf_t native_uint64_buf_t;
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# else
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// unaligned native endian signed integer buffers
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typedef little_int8_buf_t native_int8_buf_t;
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typedef little_int16_buf_t native_int16_buf_t;
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typedef little_int24_buf_t native_int24_buf_t;
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typedef little_int32_buf_t native_int32_buf_t;
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typedef little_int40_buf_t native_int40_buf_t;
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typedef little_int48_buf_t native_int48_buf_t;
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typedef little_int56_buf_t native_int56_buf_t;
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typedef little_int64_buf_t native_int64_buf_t;
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// unaligned native endian unsigned integer buffers
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typedef little_uint8_buf_t native_uint8_buf_t;
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typedef little_uint16_buf_t native_uint16_buf_t;
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typedef little_uint24_buf_t native_uint24_buf_t;
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typedef little_uint32_buf_t native_uint32_buf_t;
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typedef little_uint40_buf_t native_uint40_buf_t;
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typedef little_uint48_buf_t native_uint48_buf_t;
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typedef little_uint56_buf_t native_uint56_buf_t;
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typedef little_uint64_buf_t native_uint64_buf_t;
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# endif
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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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namespace detail
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{
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// Unrolled loops for loading and storing streams of bytes.
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template <typename T, std::size_t n_bytes,
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bool sign=boost::is_signed<T>::value >
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struct unrolled_byte_loops
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{
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typedef unrolled_byte_loops<T, n_bytes - 1, sign> next;
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static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return static_cast<T>(*(bytes - 1) | (next::load_big(bytes - 1) << 8)); }
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static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return static_cast<T>(*bytes | (next::load_little(bytes + 1) << 8)); }
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static void store_big(char* bytes, T value) BOOST_NOEXCEPT
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{
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*(bytes - 1) = static_cast<char>(value);
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next::store_big(bytes - 1, static_cast<T>(value >> 8));
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}
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static void store_little(char* bytes, T value) BOOST_NOEXCEPT
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{
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*bytes = static_cast<char>(value);
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next::store_little(bytes + 1, static_cast<T>(value >> 8));
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}
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};
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template <typename T>
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struct unrolled_byte_loops<T, 1, false>
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{
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static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return *(bytes - 1); }
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static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return *bytes; }
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static void store_big(char* bytes, T value) BOOST_NOEXCEPT
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{ *(bytes - 1) = static_cast<char>(value); }
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static void store_little(char* bytes, T value) BOOST_NOEXCEPT
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{ *bytes = static_cast<char>(value); }
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};
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template <typename T>
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struct unrolled_byte_loops<T, 1, true>
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{
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static T load_big(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return *reinterpret_cast<const signed char*>(bytes - 1); }
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static T load_little(const unsigned char* bytes) BOOST_NOEXCEPT
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{ return *reinterpret_cast<const signed char*>(bytes); }
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static void store_big(char* bytes, T value) BOOST_NOEXCEPT
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{ *(bytes - 1) = static_cast<char>(value); }
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static void store_little(char* bytes, T value) BOOST_NOEXCEPT
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{ *bytes = static_cast<char>(value); }
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};
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template <typename T, std::size_t n_bytes>
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inline
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T load_big_endian(const void* bytes) BOOST_NOEXCEPT
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{
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return unrolled_byte_loops<T, n_bytes>::load_big
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(static_cast<const unsigned char*>(bytes) + n_bytes);
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}
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template <typename T, std::size_t n_bytes>
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inline
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T load_little_endian(const void* bytes) BOOST_NOEXCEPT
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{
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# if defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86)
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// On x86 (which is little endian), unaligned loads are permitted
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if (sizeof(T) == n_bytes) // GCC 4.9, VC++ 14.0, and probably others, elide this
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// test and generate code only for the applicable return
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// case since sizeof(T) and n_bytes are known at compile
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// time.
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{
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return *reinterpret_cast<T const *>(bytes);
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}
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# endif
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return unrolled_byte_loops<T, n_bytes>::load_little
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(static_cast<const unsigned char*>(bytes));
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}
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template <typename T, std::size_t n_bytes>
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inline
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void store_big_endian(void* bytes, T value) BOOST_NOEXCEPT
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{
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unrolled_byte_loops<T, n_bytes>::store_big
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(static_cast<char*>(bytes) + n_bytes, value);
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}
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template <typename T, std::size_t n_bytes>
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inline
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void store_little_endian(void* bytes, T value) BOOST_NOEXCEPT
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{
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# if defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86)
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// On x86 (which is little endian), unaligned stores are permitted
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if (sizeof(T) == n_bytes) // GCC 4.9, VC++ 14.0, and probably others, elide this
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// test and generate code only for the applicable return
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// case since sizeof(T) and n_bytes are known at compile
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// time.
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{
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*reinterpret_cast<T *>(bytes) = value;
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return;
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}
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# endif
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unrolled_byte_loops<T, n_bytes>::store_little
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(static_cast<char*>(bytes), value);
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}
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} // namespace detail
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# ifdef BOOST_ENDIAN_LOG
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bool endian_log(true);
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# endif
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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 big endian_buffer specialization
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template <typename T, std::size_t n_bits>
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class endian_buffer< order::big, T, n_bits, align::no >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "big, unaligned, "
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<< n_bits << "-bits, construct(" << val << ")\n";
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# endif
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detail::store_big_endian<T, n_bits/8>(m_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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# ifdef BOOST_ENDIAN_LOG
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if (endian_log)
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std::cout << "big, unaligned, " << n_bits << "-bits, assign(" << val << ")\n";
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# endif
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detail::store_big_endian<T, n_bits/8>(m_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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "big, unaligned, " << n_bits << "-bits, convert("
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<< detail::load_big_endian<T, n_bits/8>(m_value) << ")\n";
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# endif
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return detail::load_big_endian<T, n_bits/8>(m_value);
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}
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const char* data() const BOOST_NOEXCEPT { return m_value; }
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protected:
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char m_value[n_bits/8];
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};
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// unaligned little endian_buffer specialization
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template <typename T, std::size_t n_bits>
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class endian_buffer< order::little, T, n_bits, align::no >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "little, unaligned, " << n_bits << "-bits, construct("
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<< val << ")\n";
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# endif
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detail::store_little_endian<T, n_bits/8>(m_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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{ detail::store_little_endian<T, n_bits/8>(m_value, val); return *this; }
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value_type value() const BOOST_NOEXCEPT
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{
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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "little, unaligned, " << n_bits << "-bits, convert("
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<< detail::load_little_endian<T, n_bits/8>(m_value) << ")\n";
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# endif
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return detail::load_little_endian<T, n_bits/8>(m_value);
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}
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const char* data() const BOOST_NOEXCEPT { return m_value; }
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protected:
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char m_value[n_bits/8];
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};
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// align::yes specializations; only n_bits == 16/32/64 supported
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// aligned big endian_buffer specialization
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template <typename T, std::size_t n_bits>
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class endian_buffer<order::big, T, n_bits, align::yes>
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{
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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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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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "big, aligned, " << n_bits
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<< "-bits, construct(" << val << ")\n";
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# endif
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m_value = ::boost::endian::native_to_big(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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m_value = ::boost::endian::native_to_big(val);
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return *this;
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}
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//operator value_type() const BOOST_NOEXCEPT
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//{
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// return ::boost::endian::big_to_native(m_value);
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//}
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value_type value() const BOOST_NOEXCEPT
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{
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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "big, aligned, " << n_bits << "-bits, convert("
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<< ::boost::endian::big_to_native(m_value) << ")\n";
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# endif
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return ::boost::endian::big_to_native(m_value);
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}
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const char* data() const BOOST_NOEXCEPT
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{return reinterpret_cast<const char*>(&m_value);}
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protected:
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T m_value;
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};
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// aligned little endian_buffer specialization
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template <typename T, std::size_t n_bits>
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class endian_buffer<order::little, T, n_bits, align::yes>
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{
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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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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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "little, aligned, " << n_bits
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<< "-bits, construct(" << val << ")\n";
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# endif
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m_value = ::boost::endian::native_to_little(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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m_value = ::boost::endian::native_to_little(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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# ifdef BOOST_ENDIAN_LOG
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if ( endian_log )
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std::cout << "little, aligned, " << n_bits << "-bits, convert("
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<< ::boost::endian::little_to_native(m_value) << ")\n";
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# endif
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return ::boost::endian::little_to_native(m_value);
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}
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const char* data() const BOOST_NOEXCEPT
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{return reinterpret_cast<const char*>(&m_value);}
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protected:
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T m_value;
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};
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} // namespace endian
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} // namespace boost
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#if defined(__BORLANDC__) || defined( __CODEGEARC__)
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# pragma pack(pop)
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#endif
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#if defined(_MSC_VER)
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# pragma warning(pop)
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#endif
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#endif // BOOST_ENDIAN_BUFFERS_HPP
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