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types.hpp: rewrite _u16-_u64 suffixes

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_u48 is unused and gone, blends into _u64.
This commit is contained in:
Nekotekina 2021-05-22 16:41:02 +03:00
parent 2768727e2f
commit 4b239a0b87
1 changed files with 9 additions and 46 deletions
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55
rpcs3/util/types.hpp
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@ -703,62 +703,25 @@ struct offset32_detail<T3 T4::*>
}
};
// Helper function, used by ""_u16, ""_u32, ""_u64
constexpr u32 to_u8(char c)
{
return static_cast<u8>(c);
}
// Convert 1-2-byte string to u16 value like reinterpret_cast does
// Convert 0-2-byte string to u16 value like reinterpret_cast does
constexpr u16 operator""_u16(const char* s, usz /*length*/)
{
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]));
}
char buf[2]{s[0], s[1]};
return std::bit_cast<u16>(buf);
}
// Convert 3-4-byte string to u32 value like reinterpret_cast does
constexpr u32 operator""_u32(const char* s, usz /*length*/)
{
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]);
}
char buf[4]{s[0], s[1], s[2], s[3]};
return std::bit_cast<u32>(buf);
}
// Convert 5-6-byte string to u64 value like reinterpret_cast does
constexpr u64 operator""_u48(const char* s, usz /*length*/)
// Convert 5-8-byte string to u64 value like reinterpret_cast does
constexpr u64 operator""_u64(const char* s, usz len)
{
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, usz /*length*/)
{
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]);
}
char buf[8]{s[0], s[1], s[2], s[3], s[4], (len < 6 ? '\0' : s[5]), (len < 7 ? '\0' : s[6]), (len < 8 ? '\0' : s[7])};
return std::bit_cast<u64>(buf);
}
#if !defined(__INTELLISENSE__) && !__has_builtin(__builtin_COLUMN) && !defined(_MSC_VER)