200 lines
3.6 KiB
C++
200 lines
3.6 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <cstring>
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#include <type_traits>
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#ifdef __APPLE__
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#include <libkern/OSByteOrder.h>
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#elif defined(__linux__)
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#include <byteswap.h>
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#elif defined(__FreeBSD__)
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#include <sys/endian.h>
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#elif defined(__OpenBSD__)
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#include <endian.h>
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#endif
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#include <fmt/format.h>
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#include "Common/CommonTypes.h"
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namespace Common
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{
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inline u8 swap8(u8 data)
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{
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return data;
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}
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inline u32 swap24(const u8* data)
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{
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return (data[0] << 16) | (data[1] << 8) | data[2];
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}
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#if defined(ANDROID) || defined(__OpenBSD__)
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#undef swap16
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#undef swap32
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#undef swap64
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#endif
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#ifdef _WIN32
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inline u16 swap16(u16 data)
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{
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return _byteswap_ushort(data);
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}
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inline u32 swap32(u32 data)
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{
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return _byteswap_ulong(data);
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}
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inline u64 swap64(u64 data)
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{
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return _byteswap_uint64(data);
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}
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#elif __linux__
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inline u16 swap16(u16 data)
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{
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return bswap_16(data);
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}
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inline u32 swap32(u32 data)
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{
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return bswap_32(data);
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}
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inline u64 swap64(u64 data)
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{
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return bswap_64(data);
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}
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#elif __APPLE__
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inline __attribute__((always_inline)) u16 swap16(u16 data)
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{
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return OSSwapInt16(data);
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}
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inline __attribute__((always_inline)) u32 swap32(u32 data)
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{
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return OSSwapInt32(data);
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}
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inline __attribute__((always_inline)) u64 swap64(u64 data)
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{
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return OSSwapInt64(data);
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}
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#elif __FreeBSD__
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inline u16 swap16(u16 data)
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{
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return bswap16(data);
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}
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inline u32 swap32(u32 data)
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{
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return bswap32(data);
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}
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inline u64 swap64(u64 data)
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{
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return bswap64(data);
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}
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#else
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// Slow generic implementation.
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inline u16 swap16(u16 data)
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{
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return (data >> 8) | (data << 8);
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}
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inline u32 swap32(u32 data)
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{
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return (swap16(data) << 16) | swap16(data >> 16);
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}
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inline u64 swap64(u64 data)
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{
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return ((u64)swap32(data) << 32) | swap32(data >> 32);
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}
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#endif
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inline u16 swap16(const u8* data)
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{
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u16 value;
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std::memcpy(&value, data, sizeof(u16));
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return swap16(value);
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}
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inline u32 swap32(const u8* data)
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{
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u32 value;
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std::memcpy(&value, data, sizeof(u32));
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return swap32(value);
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}
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inline u64 swap64(const u8* data)
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{
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u64 value;
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std::memcpy(&value, data, sizeof(u64));
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return swap64(value);
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}
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template <int count>
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void swap(u8*);
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template <>
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inline void swap<1>(u8* data)
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{
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}
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template <>
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inline void swap<2>(u8* data)
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{
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const u16 value = swap16(data);
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std::memcpy(data, &value, sizeof(u16));
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}
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template <>
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inline void swap<4>(u8* data)
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{
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const u32 value = swap32(data);
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std::memcpy(data, &value, sizeof(u32));
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}
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template <>
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inline void swap<8>(u8* data)
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{
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const u64 value = swap64(data);
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std::memcpy(data, &value, sizeof(u64));
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}
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template <typename T>
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inline T FromBigEndian(T data)
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{
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static_assert(std::is_arithmetic<T>::value, "function only makes sense with arithmetic types");
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swap<sizeof(data)>(reinterpret_cast<u8*>(&data));
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return data;
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}
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template <typename value_type>
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struct BigEndianValue
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{
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static_assert(std::is_arithmetic<value_type>(), "value_type must be an arithmetic type");
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BigEndianValue() = default;
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explicit BigEndianValue(value_type val) { *this = val; }
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operator value_type() const { return FromBigEndian(raw); }
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BigEndianValue& operator=(value_type v)
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{
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raw = FromBigEndian(v);
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return *this;
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}
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private:
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value_type raw;
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};
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} // Namespace Common
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template <typename value_type>
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struct fmt::formatter<Common::BigEndianValue<value_type>>
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{
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fmt::formatter<value_type> m_formatter;
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constexpr auto parse(format_parse_context& ctx) { return m_formatter.parse(ctx); }
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template <typename FormatContext>
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auto format(const Common::BigEndianValue<value_type>& value, FormatContext& ctx) const
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{
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return m_formatter.format(value.operator value_type(), ctx);
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}
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};
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