| #ifndef BOOST_ENDIAN_DETAIL_ENDIAN_STORE_HPP_INCLUDED |
| #define BOOST_ENDIAN_DETAIL_ENDIAN_STORE_HPP_INCLUDED |
| |
| // Copyright 2019 Peter Dimov |
| // |
| // Distributed under the Boost Software License, Version 1.0. |
| // http://www.boost.org/LICENSE_1_0.txt |
| |
| #include <boost/endian/detail/endian_reverse.hpp> |
| #include <boost/endian/detail/order.hpp> |
| #include <boost/endian/detail/integral_by_size.hpp> |
| #include <boost/endian/detail/is_trivially_copyable.hpp> |
| #include <boost/type_traits/is_integral.hpp> |
| #include <boost/type_traits/is_enum.hpp> |
| #include <boost/static_assert.hpp> |
| #include <cstddef> |
| #include <cstring> |
| |
| namespace boost |
| { |
| namespace endian |
| { |
| |
| namespace detail |
| { |
| |
| template<class T, std::size_t N1, BOOST_SCOPED_ENUM(order) O1, std::size_t N2, BOOST_SCOPED_ENUM(order) O2> struct endian_store_impl |
| { |
| }; |
| |
| } // namespace detail |
| |
| // Requires: |
| // |
| // sizeof(T) must be 1, 2, 4, or 8 |
| // 1 <= N <= sizeof(T) |
| // T is TriviallyCopyable |
| // if N < sizeof(T), T is integral or enum |
| |
| template<class T, std::size_t N, BOOST_SCOPED_ENUM(order) Order> |
| inline void endian_store( unsigned char * p, T const & v ) BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8 ); |
| BOOST_STATIC_ASSERT( N >= 1 && N <= sizeof(T) ); |
| |
| return detail::endian_store_impl<T, sizeof(T), order::native, N, Order>()( p, v ); |
| } |
| |
| namespace detail |
| { |
| |
| // same endianness, same size |
| |
| template<class T, std::size_t N, BOOST_SCOPED_ENUM(order) O> struct endian_store_impl<T, N, O, N, O> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_trivially_copyable<T>::value ); |
| |
| std::memcpy( p, &v, N ); |
| } |
| }; |
| |
| // same size, reverse endianness |
| |
| template<class T, std::size_t N, BOOST_SCOPED_ENUM(order) O1, BOOST_SCOPED_ENUM(order) O2> struct endian_store_impl<T, N, O1, N, O2> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_trivially_copyable<T>::value ); |
| |
| typename integral_by_size<N>::type tmp; |
| std::memcpy( &tmp, &v, N ); |
| |
| endian_reverse_inplace( tmp ); |
| |
| std::memcpy( p, &tmp, N ); |
| } |
| }; |
| |
| // truncating store 2 -> 1 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 2, Order, 1, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 2 ]; |
| boost::endian::endian_store<T, 2, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 2, Order, 1, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 2 ]; |
| boost::endian::endian_store<T, 2, order::big>( tmp, v ); |
| |
| p[0] = tmp[1]; |
| } |
| }; |
| |
| // truncating store 4 -> 1 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 1, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 1, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::big>( tmp, v ); |
| |
| p[0] = tmp[3]; |
| } |
| }; |
| |
| // truncating store 4 -> 2 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 2, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 2, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::big>( tmp, v ); |
| |
| p[0] = tmp[2]; |
| p[1] = tmp[3]; |
| } |
| }; |
| |
| // truncating store 4 -> 3 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 3, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 4, Order, 3, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 4 ]; |
| boost::endian::endian_store<T, 4, order::big>( tmp, v ); |
| |
| p[0] = tmp[1]; |
| p[1] = tmp[2]; |
| p[2] = tmp[3]; |
| } |
| }; |
| |
| // truncating store 8 -> 1 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 1, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 1, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 2 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 2, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 2, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[6]; |
| p[1] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 3 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 3, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 3, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[5]; |
| p[1] = tmp[6]; |
| p[2] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 4 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 4, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| p[3] = tmp[3]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 4, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[4]; |
| p[1] = tmp[5]; |
| p[2] = tmp[6]; |
| p[3] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 5 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 5, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| p[3] = tmp[3]; |
| p[4] = tmp[4]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 5, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[3]; |
| p[1] = tmp[4]; |
| p[2] = tmp[5]; |
| p[3] = tmp[6]; |
| p[4] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 6 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 6, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| p[3] = tmp[3]; |
| p[4] = tmp[4]; |
| p[5] = tmp[5]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 6, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[2]; |
| p[1] = tmp[3]; |
| p[2] = tmp[4]; |
| p[3] = tmp[5]; |
| p[4] = tmp[6]; |
| p[5] = tmp[7]; |
| } |
| }; |
| |
| // truncating store 8 -> 7 |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 7, order::little> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::little>( tmp, v ); |
| |
| p[0] = tmp[0]; |
| p[1] = tmp[1]; |
| p[2] = tmp[2]; |
| p[3] = tmp[3]; |
| p[4] = tmp[4]; |
| p[5] = tmp[5]; |
| p[6] = tmp[6]; |
| } |
| }; |
| |
| template<class T, BOOST_SCOPED_ENUM(order) Order> struct endian_store_impl<T, 8, Order, 7, order::big> |
| { |
| inline void operator()( unsigned char * p, T const & v ) const BOOST_NOEXCEPT |
| { |
| BOOST_STATIC_ASSERT( is_integral<T>::value || is_enum<T>::value ); |
| |
| unsigned char tmp[ 8 ]; |
| boost::endian::endian_store<T, 8, order::big>( tmp, v ); |
| |
| p[0] = tmp[1]; |
| p[1] = tmp[2]; |
| p[2] = tmp[3]; |
| p[3] = tmp[4]; |
| p[4] = tmp[5]; |
| p[5] = tmp[6]; |
| p[6] = tmp[7]; |
| } |
| }; |
| |
| } // namespace detail |
| |
| } // namespace endian |
| } // namespace boost |
| |
| #endif // BOOST_ENDIAN_DETAIL_ENDIAN_STORE_HPP_INCLUDED |