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Use std::endian for endianness test

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Remove legacy IS_LE_MACHINE IS_BE_MACHINE macro.
This commit is contained in:
Nekotekina 2020-02-17 20:55:20 +03:00
parent 244e74ebe2
commit 6a1a0bf48d
3 changed files with 80 additions and 39 deletions
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63
Utilities/types.h
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@ -17,9 +17,9 @@
#include <limits>
#include <array>
// Assume little-endian
#define IS_LE_MACHINE 1
#define IS_BE_MACHINE 0
#if __has_include(<bit>)
#include <bit>
#endif
#ifndef __has_builtin
#define __has_builtin(x) 0
@ -82,7 +82,7 @@
#define AUDIT(...) ((void)0)
#endif
#if defined(__cpp_lib_bit_cast) && (__cpp_lib_bit_cast >= 201806L)
#if __cpp_lib_bit_cast >= 201806L
#include <bit>
#else
namespace std
@ -530,31 +530,56 @@ constexpr u32 to_u8(char c)
return static_cast<u8>(c);
}
// Convert 2-byte string to u16 value like reinterpret_cast does
// Convert 1-2-byte string to u16 value like reinterpret_cast does
constexpr u16 operator""_u16(const char* s, std::size_t /*length*/)
{
return
#if IS_LE_MACHINE == 1
static_cast<u16>(to_u8(s[1]) << 8 | to_u8(s[0]));
#endif
if constexpr (std::endian::little == std::endian::native)
{
return static_cast<u16>(to_u8(s[1]) << 8 | to_u8(s[0]));
}
else
{
return static_cast<u16>(to_u8(s[0]) << 8 | to_u8(s[1]));
}
}
// Convert 4-byte string to u32 value like reinterpret_cast does
// Convert 3-4-byte string to u32 value like reinterpret_cast does
constexpr u32 operator""_u32(const char* s, std::size_t /*length*/)
{
return
#if IS_LE_MACHINE == 1
to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
#endif
if constexpr (std::endian::little == std::endian::native)
{
return to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
}
else
{
return to_u8(s[0]) << 24 | to_u8(s[1]) << 16 | to_u8(s[2]) << 8 | to_u8(s[3]);
}
}
// Convert 8-byte string to u64 value like reinterpret_cast does
// Convert 5-6-byte string to u64 value like reinterpret_cast does
constexpr u64 operator""_u48(const char* s, std::size_t /*length*/)
{
if constexpr (std::endian::little == std::endian::native)
{
return static_cast<u64>(to_u8(s[5]) << 8 | to_u8(s[4])) << 32 | to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
}
else
{
return static_cast<u64>(to_u8(s[0]) << 8 | to_u8(s[1])) << 32 | to_u8(s[2]) << 24 | to_u8(s[3]) << 16 | to_u8(s[4]) << 8 | to_u8(s[5]);
}
}
// Convert 7-8-byte string to u64 value like reinterpret_cast does
constexpr u64 operator""_u64(const char* s, std::size_t /*length*/)
{
return
#if IS_LE_MACHINE == 1
static_cast<u64>(to_u8(s[7]) << 24 | to_u8(s[6]) << 16 | to_u8(s[5]) << 8 | to_u8(s[4])) << 32 | to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
#endif
if constexpr (std::endian::little == std::endian::native)
{
return static_cast<u64>(to_u8(s[7]) << 24 | to_u8(s[6]) << 16 | to_u8(s[5]) << 8 | to_u8(s[4])) << 32 | to_u8(s[3]) << 24 | to_u8(s[2]) << 16 | to_u8(s[1]) << 8 | to_u8(s[0]);
}
else
{
return static_cast<u64>(to_u8(s[0]) << 24 | to_u8(s[1]) << 16 | to_u8(s[2]) << 8 | to_u8(s[3])) << 32 | to_u8(s[4]) << 24 | to_u8(s[5]) << 16 | to_u8(s[6]) << 8 | to_u8(s[7]);
}
}
namespace fmt