mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_ENDIAN_TRAITS_HPP
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#define SPROUT_ENDIAN_TRAITS_HPP
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#include <climits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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namespace sprout {
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namespace detail {
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template<typename T, typename Enable = void>
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class default_big_endian_traits;
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template<typename T>
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class default_big_endian_traits<
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T,
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typename std::enable_if<std::is_integral<T>::value && sizeof(T) == 1>::type
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> {
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public:
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typedef T type;
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public:
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static SPROUT_CONSTEXPR std::size_t
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size() {
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return sizeof(type);
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}
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static SPROUT_CONSTEXPR unsigned char
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get_byte(type const& t, std::size_t) {
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return static_cast<unsigned char>(t);
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}
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static SPROUT_CXX14_CONSTEXPR void
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set_byte(type& t, std::size_t, unsigned char value) {
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t = static_cast<type>(value);
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}
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};
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template<typename T>
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class default_big_endian_traits<
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T,
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typename std::enable_if<std::is_integral<T>::value && !(sizeof(T) == 1)>::type
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> {
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public:
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typedef T type;
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public:
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static SPROUT_CONSTEXPR std::size_t
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size() {
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return sizeof(type);
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}
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static SPROUT_CONSTEXPR unsigned char
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get_byte(type const& t, std::size_t i) {
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return static_cast<unsigned char>(
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(t & (UCHAR_MAX << CHAR_BIT * ((size() - 1) - i)))
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>> CHAR_BIT * ((size() - 1) - i)
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);
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}
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static SPROUT_CXX14_CONSTEXPR void
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set_byte(type& t, std::size_t i, unsigned char value) {
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t &= ~(UCHAR_MAX << CHAR_BIT * ((size() - 1) - i));
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t |= (value << CHAR_BIT * ((size() - 1) - i));
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}
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};
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template<typename T, typename Enable = void>
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class default_little_endian_traits;
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template<typename T>
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class default_little_endian_traits<
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T,
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typename std::enable_if<std::is_integral<T>::value && sizeof(T) == 1>::type
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> {
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public:
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typedef T type;
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public:
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static SPROUT_CONSTEXPR std::size_t size() {
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return sizeof(type);
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}
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static SPROUT_CONSTEXPR unsigned char get_byte(type const& t, std::size_t) {
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return static_cast<unsigned char>(t);
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}
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static SPROUT_CXX14_CONSTEXPR void
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set_byte(type& t, std::size_t, unsigned char value) {
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t = static_cast<type>(value);
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}
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};
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template<typename T>
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class default_little_endian_traits<
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T,
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typename std::enable_if<std::is_integral<T>::value && !(sizeof(T) == 1)>::type
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> {
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public:
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typedef T type;
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public:
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static SPROUT_CONSTEXPR std::size_t size() {
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return sizeof(type);
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}
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static SPROUT_CONSTEXPR unsigned char get_byte(type const& t, std::size_t i) {
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return static_cast<unsigned char>(
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(t & (UCHAR_MAX << CHAR_BIT * i))
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>> CHAR_BIT * i
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);
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}
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static SPROUT_CXX14_CONSTEXPR void
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set_byte(type& t, std::size_t i, unsigned char value) {
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t &= ~(UCHAR_MAX << CHAR_BIT * i);
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t |= (value << CHAR_BIT * i);
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}
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};
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} // namespace detail
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//
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// big_endian_traits
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//
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template<typename T>
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class big_endian_traits
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: public sprout::detail::default_big_endian_traits<T>
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{};
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//
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// little_endian_traits
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//
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template<typename T>
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class little_endian_traits
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: public sprout::detail::default_little_endian_traits<T>
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{};
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//
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// endian_traits
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//
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template<typename T>
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class endian_traits
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: public sprout::big_endian_traits<T>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_ENDIAN_TRAITS_HPP
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