mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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namespace ams::util {
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/* TODO: C++20 std::endian */
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constexpr bool IsLittleEndian() {
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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return true;
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#else
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return false;
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#endif
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}
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constexpr bool IsBigEndian() {
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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return true;
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#else
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return false;
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#endif
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}
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static_assert(IsLittleEndian() ^ IsBigEndian());
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template<typename U> /* requires unsigned_integral<U> */
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constexpr ALWAYS_INLINE U SwapBytes(const U u) {
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static_assert(BITSIZEOF(u8) == 8);
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constexpr U ByteMask = 0xFFu;
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if constexpr (std::is_same<U, u64>::value) {
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return ((u & (ByteMask << 56)) >> 56) |
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((u & (ByteMask << 48)) >> 40) |
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((u & (ByteMask << 40)) >> 24) |
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((u & (ByteMask << 32)) >> 8) |
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((u & (ByteMask << 24)) << 8) |
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((u & (ByteMask << 16)) << 24) |
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((u & (ByteMask << 8)) << 40) |
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((u & (ByteMask << 0)) << 56);
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} else if constexpr (std::is_same<U, u32>::value) {
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return ((u & (ByteMask << 24)) >> 24) |
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((u & (ByteMask << 16)) >> 8) |
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((u & (ByteMask << 8)) << 8) |
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((u & (ByteMask << 0)) << 24);
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} else if constexpr (std::is_same<U, u16>::value) {
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return ((u & (ByteMask << 8)) >> 8) |
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((u & (ByteMask << 0)) << 8);
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} else if constexpr (std::is_same<U, u8>::value) {
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return u;
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} else {
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static_assert(!std::is_same<U, U>::value);
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}
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}
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template<typename T> /* requires integral<T> */
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constexpr ALWAYS_INLINE void SwapBytes(T *ptr) {
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using U = typename std::make_unsigned<T>::type;
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*ptr = static_cast<T>(SwapBytes(static_cast<U>(*ptr)));
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}
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template<typename T>
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constexpr ALWAYS_INLINE T ConvertToBigEndian(const T val) {
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if constexpr (IsBigEndian()) {
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return val;
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} else {
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static_assert(IsLittleEndian());
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return SwapBytes(val);
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}
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}
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template<typename T>
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constexpr ALWAYS_INLINE T ConvertToLittleEndian(const T val) {
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if constexpr (IsBigEndian()) {
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return SwapBytes(val);
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} else {
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static_assert(IsLittleEndian());
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return val;
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}
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}
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template<typename T> /* requires integral<T> */
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constexpr ALWAYS_INLINE T LoadBigEndian(T *ptr) {
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return ConvertToBigEndian(*ptr);
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}
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template<typename T> /* requires integral<T> */
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constexpr ALWAYS_INLINE T LoadLittleEndian(T *ptr) {
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return ConvertToLittleEndian(*ptr);
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}
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template<typename T>
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constexpr ALWAYS_INLINE void StoreBigEndian(T *ptr, T val) {
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*ptr = ConvertToBigEndian(val);
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}
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template<typename T>
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constexpr ALWAYS_INLINE void StoreLittleEndian(T *ptr, T val) {
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*ptr = ConvertToLittleEndian(val);
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}
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}
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