167 lines
4.4 KiB
C++
167 lines
4.4 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2020 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_BASE_BYTE_ORDER_H_
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#define XENIA_BASE_BYTE_ORDER_H_
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#include <cstdint>
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#if defined __has_include
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#if __has_include(<version>)
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#include <version>
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#endif
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#endif
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#if __cpp_lib_endian
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#include <bit>
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#endif
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#include "xenia/base/assert.h"
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#include "xenia/base/platform.h"
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#if XE_PLATFORM_LINUX
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#include <byteswap.h>
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#endif
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#if !__cpp_lib_endian
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// Polyfill
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#ifdef __BYTE_ORDER__
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namespace std {
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enum class endian {
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little = __ORDER_LITTLE_ENDIAN__,
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big = __ORDER_BIG_ENDIAN__,
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native = __BYTE_ORDER__
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};
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}
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#else
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// Hardcode to little endian for now
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namespace std {
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enum class endian { little = 0, big = 1, native = 0 };
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}
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#endif
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#endif
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// Check for mixed endian
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static_assert((std::endian::native == std::endian::big) ||
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(std::endian::native == std::endian::little));
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namespace xe {
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#if XE_PLATFORM_WIN32
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#define XENIA_BASE_BYTE_SWAP_16 _byteswap_ushort
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#define XENIA_BASE_BYTE_SWAP_32 _byteswap_ulong
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#define XENIA_BASE_BYTE_SWAP_64 _byteswap_uint64
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#elif XE_PLATFORM_MAC
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#define XENIA_BASE_BYTE_SWAP_16 OSSwapInt16
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#define XENIA_BASE_BYTE_SWAP_32 OSSwapInt32
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#define XENIA_BASE_BYTE_SWAP_64 OSSwapInt64
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#else
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#define XENIA_BASE_BYTE_SWAP_16 bswap_16
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#define XENIA_BASE_BYTE_SWAP_32 bswap_32
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#define XENIA_BASE_BYTE_SWAP_64 bswap_64
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#endif // XE_PLATFORM_WIN32
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inline int8_t byte_swap(int8_t value) { return value; }
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inline uint8_t byte_swap(uint8_t value) { return value; }
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inline int16_t byte_swap(int16_t value) {
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return static_cast<int16_t>(
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XENIA_BASE_BYTE_SWAP_16(static_cast<int16_t>(value)));
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}
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inline uint16_t byte_swap(uint16_t value) {
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return XENIA_BASE_BYTE_SWAP_16(value);
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}
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inline uint16_t byte_swap(char16_t value) {
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return static_cast<char16_t>(XENIA_BASE_BYTE_SWAP_16(value));
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}
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inline int32_t byte_swap(int32_t value) {
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return static_cast<int32_t>(
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XENIA_BASE_BYTE_SWAP_32(static_cast<int32_t>(value)));
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}
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inline uint32_t byte_swap(uint32_t value) {
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return XENIA_BASE_BYTE_SWAP_32(value);
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}
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inline int64_t byte_swap(int64_t value) {
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return static_cast<int64_t>(
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XENIA_BASE_BYTE_SWAP_64(static_cast<int64_t>(value)));
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}
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inline uint64_t byte_swap(uint64_t value) {
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return XENIA_BASE_BYTE_SWAP_64(value);
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}
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inline float byte_swap(float value) {
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uint32_t temp = byte_swap(*reinterpret_cast<uint32_t*>(&value));
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return *reinterpret_cast<float*>(&temp);
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}
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inline double byte_swap(double value) {
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uint64_t temp = byte_swap(*reinterpret_cast<uint64_t*>(&value));
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return *reinterpret_cast<double*>(&temp);
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}
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template <typename T>
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inline T byte_swap(T value) {
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if (sizeof(T) == 4) {
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return static_cast<T>(byte_swap(static_cast<uint32_t>(value)));
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} else if (sizeof(T) == 2) {
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return static_cast<T>(byte_swap(static_cast<uint16_t>(value)));
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} else {
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assert_always("not handled");
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}
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}
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template <typename T, std::endian E>
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struct endian_store {
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endian_store() = default;
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endian_store(const T& src) {
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if constexpr (std::endian::native == E) {
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value = src;
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} else {
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value = xe::byte_swap(src);
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}
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}
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endian_store(const endian_store& other) { value = other.value; }
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operator T() const {
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if constexpr (std::endian::native == E) {
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return value;
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} else {
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return xe::byte_swap(value);
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}
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}
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endian_store<T, E>& operator+=(int a) {
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*this = *this + a;
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return *this;
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}
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endian_store<T, E>& operator-=(int a) {
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*this = *this - a;
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return *this;
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}
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endian_store<T, E>& operator++() {
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*this += 1;
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return *this;
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} // ++a
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endian_store<T, E> operator++(int) {
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*this += 1;
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return (*this - 1);
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} // a++
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endian_store<T, E>& operator--() {
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*this -= 1;
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return *this;
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} // --a
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endian_store<T, E> operator--(int) {
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*this -= 1;
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return (*this + 1);
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} // a--
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T value;
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};
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template <typename T>
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using be = endian_store<T, std::endian::big>;
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template <typename T>
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using le = endian_store<T, std::endian::little>;
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} // namespace xe
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#endif // XENIA_BASE_BYTE_ORDER_H_
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