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Add specialization for SafeConvert

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Jeffrey Walton 2023-06-23 00:24:04 -04:00
parent 805a1c4fcf
commit 143b9d2619
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GPG Key ID: B36AB348921B1838
1 changed files with 33 additions and 1 deletions
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34
misc.h
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@ -761,7 +761,39 @@ inline bool SafeConvert(sword64 from, word64 &to)
{
if (from < 0)
return false;
to = static_cast<sword64>(from);
to = static_cast<word64>(from);
return true;
}
/// \brief Tests whether a conversion from -> to is safe to perform
/// \param from the first value
/// \param to the second value
/// \return true if its safe to convert \p from to \p to, false otherwise.
/// \details if the function returns true, then it is safe to use \p to. If the function returns false,
/// then \p to is undefined and should not be used.
/// \since Crypto++ 8.7
template<>
inline bool SafeConvert(word64 from, sword32 &to)
{
if (from > static_cast<word64>(std::numeric_limits<sword32>::max()))
return false;
to = static_cast<sword32>(from);
return true;
}
/// \brief Tests whether a conversion from -> to is safe to perform
/// \param from the first value
/// \param to the second value
/// \return true if its safe to convert \p from to \p to, false otherwise.
/// \details if the function returns true, then it is safe to use \p to. If the function returns false,
/// then \p to is undefined and should not be used.
/// \since Crypto++ 8.7
template<>
inline bool SafeConvert(sword32 from, word64 &to)
{
if (from < 0)
return false;
to = static_cast<word64>(from);
return true;
}