89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/* Copyright 2016-2018 Michele Santullo
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* This file is part of "duckhandy".
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*
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* "duckhandy" is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* "duckhandy" is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with "duckhandy". If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef id1A975372553B45BC8C4E42CDBDD97497
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#define id1A975372553B45BC8C4E42CDBDD97497
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#include "ducktypes.hpp"
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#include "int_types.hpp"
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#include <cstdint>
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#include <endian.h>
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#include <type_traits>
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namespace dhandy {
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template <typename T> constexpr typename std::enable_if<std::is_integral<T>::value, T>::type htobe (T parV);
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template <typename T> constexpr typename std::enable_if<std::is_integral<T>::value, T>::type htole (T parV);
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template <typename T> constexpr T betoh (T parV);
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template <typename T> constexpr T letoh (T parV);
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namespace implem {
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template <unsigned int S> constexpr
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typename int_t<S, false>::type bswap (typename int_t<S, false>::type parV);
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template <>
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[[gnu::pure]] inline constexpr
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u8 bswap<1> (u8 parV) { return parV; }
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template <>
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[[gnu::pure]] inline constexpr
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u16 bswap<2> (u16 parV) { return __builtin_bswap16(parV); }
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template <>
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[[gnu::pure]] inline constexpr
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u32 bswap<4> (u32 parV) { return __builtin_bswap32(parV); }
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template <>
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[[gnu::pure]] inline constexpr
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u64 bswap<8> (u64 parV) { return __builtin_bswap64(parV); }
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} //namespace implem
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template <typename T>
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[[gnu::pure]] inline constexpr
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auto htobe (T parV) -> typename std::enable_if<std::is_integral<T>::value, T>::type {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return static_cast<T>(implem::bswap<sizeof(T)>(static_cast<typename int_t<sizeof(T), false>::type>(parV)));
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <typename T>
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[[gnu::pure]] inline constexpr
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auto htole (T parV) -> typename std::enable_if<std::is_integral<T>::value, T>::type {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return static_cast<T>(implem::bswap<sizeof(T)>(static_cast<typename int_t<sizeof(T), false>::type>(parV)));
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <typename T>
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[[gnu::pure]] inline constexpr T betoh (T parV) {
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return htobe<T>(parV);
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}
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template <typename T>
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[[gnu::pure]] inline constexpr T letoh (T parV) {
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return htole<T>(parV);
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}
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} //namespace dhandy
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#endif
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