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util: add ConvertTo*Endian48

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This commit is contained in:
Michael Scire 2020-02-24 19:29:00 -08:00
parent a429c61f33
commit 191414c832
1 changed files with 51 additions and 6 deletions
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57
libraries/libvapours/include/vapours/util/util_endian.hpp
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@ -71,6 +71,19 @@ namespace ams::util {
} }
} }
constexpr ALWAYS_INLINE u64 SwapBytes48(const u64 u) {
using U = u64;
static_assert(BITSIZEOF(u8) == 8);
constexpr U ByteMask = 0xFFu;
AMS_ASSERT((u & UINT64_C(0xFFFF000000000000)) == 0);
return ((u & (ByteMask << 40)) >> 40) |
((u & (ByteMask << 32)) >> 24) |
((u & (ByteMask << 24)) >> 8) |
((u & (ByteMask << 16)) << 8) |
((u & (ByteMask << 8)) << 24) |
((u & (ByteMask << 0)) << 40);
}
template<typename T> /* requires integral<T> */ template<typename T> /* requires integral<T> */
constexpr ALWAYS_INLINE void SwapBytes(T *ptr) { constexpr ALWAYS_INLINE void SwapBytes(T *ptr) {
using U = typename std::make_unsigned<T>::type; using U = typename std::make_unsigned<T>::type;
@ -78,23 +91,55 @@ namespace ams::util {
*ptr = static_cast<T>(SwapBytes(static_cast<U>(*ptr))); *ptr = static_cast<T>(SwapBytes(static_cast<U>(*ptr)));
} }
template<typename T> template<typename T> /* requires integral<T> */
constexpr ALWAYS_INLINE T ConvertToBigEndian(const T val) { constexpr ALWAYS_INLINE T ConvertToBigEndian(const T val) {
using U = typename std::make_unsigned<T>::type;
if constexpr (IsBigEndian()) { if constexpr (IsBigEndian()) {
return val; return static_cast<T>(static_cast<U>(val));
} else { } else {
static_assert(IsLittleEndian()); static_assert(IsLittleEndian());
return SwapBytes(val); return static_cast<T>(SwapBytes(static_cast<U>(val)));
} }
} }
template<typename T> template<typename T> /* requires integral<T> */
constexpr ALWAYS_INLINE T ConvertToLittleEndian(const T val) { constexpr ALWAYS_INLINE T ConvertToLittleEndian(const T val) {
using U = typename std::make_unsigned<T>::type;
if constexpr (IsBigEndian()) { if constexpr (IsBigEndian()) {
return SwapBytes(val); return static_cast<T>(SwapBytes(static_cast<U>(val)));
} else { } else {
static_assert(IsLittleEndian()); static_assert(IsLittleEndian());
return val; return static_cast<T>(static_cast<U>(val));
}
}
template<typename T> /* requires integral<T> */
constexpr ALWAYS_INLINE T ConvertToBigEndian48(const T val) {
using U = typename std::make_unsigned<T>::type;
static_assert(sizeof(T) == sizeof(u64));
if constexpr (IsBigEndian()) {
AMS_ASSERT((static_cast<U>(val) & UINT64_C(0xFFFF000000000000)) == 0);
return static_cast<T>(static_cast<U>(val));
} else {
static_assert(IsLittleEndian());
return static_cast<T>(SwapBytes48(static_cast<U>(val)));
}
}
template<typename T> /* requires integral<T> */
constexpr ALWAYS_INLINE T ConvertToLittleEndian48(const T val) {
using U = typename std::make_unsigned<T>::type;
static_assert(sizeof(T) == sizeof(u64));
if constexpr (IsBigEndian()) {
return static_cast<T>(SwapBytes48(static_cast<U>(val)));
} else {
static_assert(IsLittleEndian());
AMS_ASSERT((static_cast<U>(val) & UINT64_C(0xFFFF000000000000)) == 0);
return static_cast<T>(static_cast<U>(val));
} }
} }