Loading...
Searching...
No Matches
endian.hpp
/*
SPDX-License-Identifier: MIT
Copyright © 2023 Amebis
*/
#pragma once
#include "compat.hpp"
#include "system.hpp"
#include <stdint.h>
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#endif
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif
#ifndef BYTE_ORDER
#if defined(_WIN32)
#if REG_DWORD == REG_DWORD_LITTLE_ENDIAN
#define BYTE_ORDER LITTLE_ENDIAN
#elif REG_DWORD == REG_DWORD_BIG_ENDIAN
#define BYTE_ORDER BIG_ENDIAN
#endif
#elif defined(__APPLE__)
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define BYTE_ORDER LITTLE_ENDIAN
#elif __BYTE_ORDER == __ORDER_BIG_ENDIAN__
#define BYTE_ORDER BIG_ENDIAN
#endif
#else
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define BYTE_ORDER LITTLE_ENDIAN
#elif __BYTE_ORDER == __BIG_ENDIAN
#define BYTE_ORDER BIG_ENDIAN
#endif
#endif
#ifndef BYTE_ORDER
#error Unknown endian
#endif
#endif
namespace stdex
{
inline uint8_t byteswap(_In_ const uint8_t value)
{
return value;
}
inline uint16_t byteswap(_In_ const uint16_t value)
{
#if _MSC_VER >= 1300
return _byteswap_ushort(value);
#elif defined(_MSC_VER)
uint16_t t = (value & 0x00ff) << 8;
t |= (value) >> 8;
return t;
#else
return __builtin_bswap16(value);
#endif
}
inline uint32_t byteswap(_In_ const uint32_t value)
{
#if _MSC_VER >= 1300
return _byteswap_ulong(value);
#elif defined(_MSC_VER)
uint32_t t = (value & 0x000000ff) << 24;
t |= (value & 0x0000ff00) << 8;
t |= (value & 0x00ff0000) >> 8;
t |= (value) >> 24;
return t;
#else
return __builtin_bswap32(value);
#endif
}
inline uint64_t byteswap(_In_ const uint64_t value)
{
#if _MSC_VER >= 1300
return _byteswap_uint64(value);
#elif defined(_MSC_VER)
uint64_t t = (value & 0x00000000000000ff) << 56;
t |= (value & 0x000000000000ff00) << 40;
t |= (value & 0x0000000000ff0000) << 24;
t |= (value & 0x00000000ff000000) << 8;
t |= (value & 0x000000ff00000000) >> 8;
t |= (value & 0x0000ff0000000000) >> 24;
t |= (value & 0x00ff000000000000) >> 40;
t |= (value) >> 56;
return t;
#else
return __builtin_bswap64(value);
#endif
}
inline int8_t byteswap(_In_ const char value) { return byteswap(static_cast<uint8_t>(value)); }
inline int8_t byteswap(_In_ const int8_t value) { return byteswap(static_cast<uint8_t>(value)); }
inline int16_t byteswap(_In_ const int16_t value) { return byteswap(static_cast<uint16_t>(value)); }
inline int32_t byteswap(_In_ const int32_t value) { return byteswap(static_cast<uint32_t>(value)); }
inline int64_t byteswap(_In_ const int64_t value) { return byteswap(static_cast<uint64_t>(value)); }
inline float byteswap(_In_ const float value)
{
uint32_t r = byteswap(*reinterpret_cast<const uint32_t*>(&value));
return *reinterpret_cast<float*>(&r);
}
inline double byteswap(_In_ const double value)
{
uint64_t r = byteswap(*reinterpret_cast<const uint64_t*>(&value));
return *reinterpret_cast<double*>(&r);
}
inline void byteswap(_Inout_ uint8_t* value) { _Assume_(value); *value = byteswap(*value); }
inline void byteswap(_Inout_ uint16_t* value) { _Assume_(value); *value = byteswap(*value); }
inline void byteswap(_Inout_ uint32_t* value) { _Assume_(value); *value = byteswap(*value); }
inline void byteswap(_Inout_ uint64_t* value) { _Assume_(value); *value = byteswap(*value); }
inline void byteswap(_Inout_ char* value) { byteswap(reinterpret_cast<uint8_t*>(value)); }
inline void byteswap(_Inout_ int8_t* value) { byteswap(reinterpret_cast<uint8_t*>(value)); }
inline void byteswap(_Inout_ int16_t* value) { byteswap(reinterpret_cast<uint16_t*>(value)); }
inline void byteswap(_Inout_ int32_t* value) { byteswap(reinterpret_cast<uint32_t*>(value)); }
inline void byteswap(_Inout_ int64_t* value) { byteswap(reinterpret_cast<uint64_t*>(value)); }
inline void byteswap(_Inout_ float* value) { byteswap(reinterpret_cast<uint32_t*>(value)); }
inline void byteswap(_Inout_ double* value) { byteswap(reinterpret_cast<uint64_t*>(value)); }
}
#if BYTE_ORDER == BIG_ENDIAN
#define LE2HE(x) stdex::byteswap(x)
#define BE2HE(x) (x)
#define HE2LE(x) stdex::byteswap(x)
#define HE2BE(x) (x)
#else
#define LE2HE(x) (x)
#define BE2HE(x) stdex::byteswap(x)
#define HE2LE(x) (x)
#define HE2BE(x) stdex::byteswap(x)
#endif