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-rw-r--r--src/common/swap.h270
1 files changed, 166 insertions, 104 deletions
diff --git a/src/common/swap.h b/src/common/swap.h
index 0e219747f..71932c2bb 100644
--- a/src/common/swap.h
+++ b/src/common/swap.h
@@ -17,13 +17,10 @@
#pragma once
+#include <type_traits>
+
#if defined(_MSC_VER)
#include <cstdlib>
-#elif defined(__linux__)
-#include <byteswap.h>
-#elif defined(__Bitrig__) || defined(__DragonFly__) || defined(__FreeBSD__) || \
- defined(__NetBSD__) || defined(__OpenBSD__)
-#include <sys/endian.h>
#endif
#include <cstring>
#include "common/common_types.h"
@@ -60,86 +57,49 @@
namespace Common {
#ifdef _MSC_VER
-inline u16 swap16(u16 _data) {
- return _byteswap_ushort(_data);
-}
-inline u32 swap32(u32 _data) {
- return _byteswap_ulong(_data);
-}
-inline u64 swap64(u64 _data) {
- return _byteswap_uint64(_data);
-}
-#elif defined(ARCHITECTURE_ARM) && (__ARM_ARCH >= 6)
-inline u16 swap16(u16 _data) {
- u32 data = _data;
- __asm__("rev16 %0, %1\n" : "=l"(data) : "l"(data));
- return (u16)data;
-}
-inline u32 swap32(u32 _data) {
- __asm__("rev %0, %1\n" : "=l"(_data) : "l"(_data));
- return _data;
-}
-inline u64 swap64(u64 _data) {
- return ((u64)swap32(_data) << 32) | swap32(_data >> 32);
-}
-#elif __linux__
-inline u16 swap16(u16 _data) {
- return bswap_16(_data);
-}
-inline u32 swap32(u32 _data) {
- return bswap_32(_data);
-}
-inline u64 swap64(u64 _data) {
- return bswap_64(_data);
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
+ return _byteswap_ushort(data);
}
-#elif __APPLE__
-inline __attribute__((always_inline)) u16 swap16(u16 _data) {
- return (_data >> 8) | (_data << 8);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return _byteswap_ulong(data);
}
-inline __attribute__((always_inline)) u32 swap32(u32 _data) {
- return __builtin_bswap32(_data);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return _byteswap_uint64(data);
}
-inline __attribute__((always_inline)) u64 swap64(u64 _data) {
- return __builtin_bswap64(_data);
-}
-#elif defined(__Bitrig__) || defined(__OpenBSD__)
+#elif defined(__clang__) || defined(__GNUC__)
+#if defined(__Bitrig__) || defined(__OpenBSD__)
// redefine swap16, swap32, swap64 as inline functions
#undef swap16
#undef swap32
#undef swap64
-inline u16 swap16(u16 _data) {
- return __swap16(_data);
-}
-inline u32 swap32(u32 _data) {
- return __swap32(_data);
-}
-inline u64 swap64(u64 _data) {
- return __swap64(_data);
-}
-#elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)
-inline u16 swap16(u16 _data) {
- return bswap16(_data);
+#endif
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
+ return __builtin_bswap16(data);
}
-inline u32 swap32(u32 _data) {
- return bswap32(_data);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return __builtin_bswap32(data);
}
-inline u64 swap64(u64 _data) {
- return bswap64(_data);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return __builtin_bswap64(data);
}
#else
-// Slow generic implementation.
-inline u16 swap16(u16 data) {
+// Generic implementation.
+[[nodiscard]] inline u16 swap16(u16 data) noexcept {
return (data >> 8) | (data << 8);
}
-inline u32 swap32(u32 data) {
- return (swap16(data) << 16) | swap16(data >> 16);
+[[nodiscard]] inline u32 swap32(u32 data) noexcept {
+ return ((data & 0xFF000000U) >> 24) | ((data & 0x00FF0000U) >> 8) |
+ ((data & 0x0000FF00U) << 8) | ((data & 0x000000FFU) << 24);
}
-inline u64 swap64(u64 data) {
- return ((u64)swap32(data) << 32) | swap32(data >> 32);
+[[nodiscard]] inline u64 swap64(u64 data) noexcept {
+ return ((data & 0xFF00000000000000ULL) >> 56) | ((data & 0x00FF000000000000ULL) >> 40) |
+ ((data & 0x0000FF0000000000ULL) >> 24) | ((data & 0x000000FF00000000ULL) >> 8) |
+ ((data & 0x00000000FF000000ULL) << 8) | ((data & 0x0000000000FF0000ULL) << 24) |
+ ((data & 0x000000000000FF00ULL) << 40) | ((data & 0x00000000000000FFULL) << 56);
}
#endif
-inline float swapf(float f) {
+[[nodiscard]] inline float swapf(float f) noexcept {
static_assert(sizeof(u32) == sizeof(float), "float must be the same size as uint32_t.");
u32 value;
@@ -151,7 +111,7 @@ inline float swapf(float f) {
return f;
}
-inline double swapd(double f) {
+[[nodiscard]] inline double swapd(double f) noexcept {
static_assert(sizeof(u64) == sizeof(double), "double must be the same size as uint64_t.");
u64 value;
@@ -170,7 +130,7 @@ struct swap_struct_t {
using swapped_t = swap_struct_t;
protected:
- T value = T();
+ T value;
static T swap(T v) {
return F::swap(v);
@@ -605,52 +565,154 @@ struct swap_double_t {
}
};
-#if COMMON_LITTLE_ENDIAN
-using u16_le = u16;
-using u32_le = u32;
-using u64_le = u64;
+template <typename T>
+struct swap_enum_t {
+ static_assert(std::is_enum_v<T>);
+ using base = std::underlying_type_t<T>;
-using s16_le = s16;
-using s32_le = s32;
-using s64_le = s64;
+public:
+ swap_enum_t() = default;
+ swap_enum_t(const T& v) : value(swap(v)) {}
-using float_le = float;
-using double_le = double;
+ swap_enum_t& operator=(const T& v) {
+ value = swap(v);
+ return *this;
+ }
-using u64_be = swap_struct_t<u64, swap_64_t<u64>>;
-using s64_be = swap_struct_t<s64, swap_64_t<s64>>;
+ operator T() const {
+ return swap(value);
+ }
-using u32_be = swap_struct_t<u32, swap_32_t<u32>>;
-using s32_be = swap_struct_t<s32, swap_32_t<s32>>;
+ explicit operator base() const {
+ return static_cast<base>(swap(value));
+ }
-using u16_be = swap_struct_t<u16, swap_16_t<u16>>;
-using s16_be = swap_struct_t<s16, swap_16_t<s16>>;
+protected:
+ T value{};
+ // clang-format off
+ using swap_t = std::conditional_t<
+ std::is_same_v<base, u16>, swap_16_t<u16>, std::conditional_t<
+ std::is_same_v<base, s16>, swap_16_t<s16>, std::conditional_t<
+ std::is_same_v<base, u32>, swap_32_t<u32>, std::conditional_t<
+ std::is_same_v<base, s32>, swap_32_t<s32>, std::conditional_t<
+ std::is_same_v<base, u64>, swap_64_t<u64>, std::conditional_t<
+ std::is_same_v<base, s64>, swap_64_t<s64>, void>>>>>>;
+ // clang-format on
+ static T swap(T x) {
+ return static_cast<T>(swap_t::swap(static_cast<base>(x)));
+ }
+};
-using float_be = swap_struct_t<float, swap_float_t<float>>;
-using double_be = swap_struct_t<double, swap_double_t<double>>;
-#else
+struct SwapTag {}; // Use the different endianness from the system
+struct KeepTag {}; // Use the same endianness as the system
-using u64_le = swap_struct_t<u64, swap_64_t<u64>>;
-using s64_le = swap_struct_t<s64, swap_64_t<s64>>;
+template <typename T, typename Tag>
+struct AddEndian;
-using u32_le = swap_struct_t<u32, swap_32_t<u32>>;
-using s32_le = swap_struct_t<s32, swap_32_t<s32>>;
+// KeepTag specializations
-using u16_le = swap_struct_t<u16, swap_16_t<u16>>;
-using s16_le = swap_struct_t<s16, swap_16_t<s16>>;
+template <typename T>
+struct AddEndian<T, KeepTag> {
+ using type = T;
+};
-using float_le = swap_struct_t<float, swap_float_t<float>>;
-using double_le = swap_struct_t<double, swap_double_t<double>>;
+// SwapTag specializations
-using u16_be = u16;
-using u32_be = u32;
-using u64_be = u64;
+template <>
+struct AddEndian<u8, SwapTag> {
+ using type = u8;
+};
-using s16_be = s16;
-using s32_be = s32;
-using s64_be = s64;
+template <>
+struct AddEndian<u16, SwapTag> {
+ using type = swap_struct_t<u16, swap_16_t<u16>>;
+};
-using float_be = float;
-using double_be = double;
+template <>
+struct AddEndian<u32, SwapTag> {
+ using type = swap_struct_t<u32, swap_32_t<u32>>;
+};
+
+template <>
+struct AddEndian<u64, SwapTag> {
+ using type = swap_struct_t<u64, swap_64_t<u64>>;
+};
+
+template <>
+struct AddEndian<s8, SwapTag> {
+ using type = s8;
+};
+
+template <>
+struct AddEndian<s16, SwapTag> {
+ using type = swap_struct_t<s16, swap_16_t<s16>>;
+};
+
+template <>
+struct AddEndian<s32, SwapTag> {
+ using type = swap_struct_t<s32, swap_32_t<s32>>;
+};
+
+template <>
+struct AddEndian<s64, SwapTag> {
+ using type = swap_struct_t<s64, swap_64_t<s64>>;
+};
+
+template <>
+struct AddEndian<float, SwapTag> {
+ using type = swap_struct_t<float, swap_float_t<float>>;
+};
+
+template <>
+struct AddEndian<double, SwapTag> {
+ using type = swap_struct_t<double, swap_double_t<double>>;
+};
+
+template <typename T>
+struct AddEndian<T, SwapTag> {
+ static_assert(std::is_enum_v<T>);
+ using type = swap_enum_t<T>;
+};
+
+// Alias LETag/BETag as KeepTag/SwapTag depending on the system
+#if COMMON_LITTLE_ENDIAN
+
+using LETag = KeepTag;
+using BETag = SwapTag;
+
+#else
+
+using BETag = KeepTag;
+using LETag = SwapTag;
#endif
+
+// Aliases for LE types
+using u16_le = AddEndian<u16, LETag>::type;
+using u32_le = AddEndian<u32, LETag>::type;
+using u64_le = AddEndian<u64, LETag>::type;
+
+using s16_le = AddEndian<s16, LETag>::type;
+using s32_le = AddEndian<s32, LETag>::type;
+using s64_le = AddEndian<s64, LETag>::type;
+
+template <typename T>
+using enum_le = std::enable_if_t<std::is_enum_v<T>, typename AddEndian<T, LETag>::type>;
+
+using float_le = AddEndian<float, LETag>::type;
+using double_le = AddEndian<double, LETag>::type;
+
+// Aliases for BE types
+using u16_be = AddEndian<u16, BETag>::type;
+using u32_be = AddEndian<u32, BETag>::type;
+using u64_be = AddEndian<u64, BETag>::type;
+
+using s16_be = AddEndian<s16, BETag>::type;
+using s32_be = AddEndian<s32, BETag>::type;
+using s64_be = AddEndian<s64, BETag>::type;
+
+template <typename T>
+using enum_be = std::enable_if_t<std::is_enum_v<T>, typename AddEndian<T, BETag>::type>;
+
+using float_be = AddEndian<float, BETag>::type;
+using double_be = AddEndian<double, BETag>::type;
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-03 02:03:19 +0000