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Cleanup after merging PR #1043

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This commit is contained in:
Jeffrey Walton 2022-02-14 09:08:10 -05:00
parent e06bac5bfc
commit c07c53ae41
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1 changed files with 2 additions and 43 deletions
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45
misc.h
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@ -1113,47 +1113,6 @@ inline T1 SaturatingSubtract1(const T1 &a, const T2 &b)
return T1((a > b) ? (a - b) : 1);
}
/// \brief Get the appropriate mask to do a truncating cast
template <class T, size_t SIZE = sizeof(T)>
struct TruncatingMask;
template <class T>
struct TruncatingMask<T, 1>
{
T operator()()
{
return 0xFF;
}
};
template <class T>
struct TruncatingMask<T, 2>
{
T operator()()
{
return 0xFFFF;
}
};
template <class T>
struct TruncatingMask<T, 4>
{
T operator()()
{
return 0xFFFFFFFF;
}
};
template <class T>
struct TruncatingMask<T, 8>
{
T operator()()
{
return 0xFFFFFFFFFFFFFFFF;
}
};
/// \brief Reduces a value to a power of 2
/// \tparam T1 class or type
/// \tparam T2 class or type
@ -1167,8 +1126,8 @@ inline T2 ModPowerOf2(const T1 &a, const T2 &b)
{
CRYPTOPP_ASSERT(IsPowerOf2(b));
// Coverity finding CID 170383 Overflowed return value (INTEGER_OVERFLOW)
// Visual studio runtime_checks don't like us truncating here with the cast to T2 TruncatingMask works around it
return T2(a & TruncatingMask<T2>()()) & SaturatingSubtract(b,1U);
// Visual Studio and /RTCc warning, https://docs.microsoft.com/en-us/cpp/build/reference/rtc-run-time-error-checks
return T2(a & SaturatingSubtract(b,1U));
}
/// \brief Rounds a value down to a multiple of a second value