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Update from_multiplier () overflow checks (#2337)

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Sergey Kroshnin 2019-10-11 16:51:29 +03:00 • committed by GitHub
commit 7a81bce13b
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1 changed files with 13 additions and 2 deletions
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15
nano/lib/numbers.cpp
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@ -915,8 +915,19 @@ std::string nano::to_string (double const value_a, int const precision_a)
uint64_t nano::difficulty::from_multiplier (double const multiplier_a, uint64_t const base_difficulty_a)
{
assert (multiplier_a > 0.);
uint64_t reverse_difficulty (static_cast<uint64_t> ((-base_difficulty_a) / multiplier_a));
return (reverse_difficulty != 0 || base_difficulty_a == 0 || multiplier_a < 1. ? -reverse_difficulty : std::numeric_limits<std::uint64_t>::max ());
nano::uint128_t reverse_difficulty ((-base_difficulty_a) / multiplier_a);
if (reverse_difficulty > std::numeric_limits<std::uint64_t>::max ())
{
return 0;
}
else if (reverse_difficulty != 0 || base_difficulty_a == 0 || multiplier_a < 1.)
{
return -(static_cast<uint64_t> (reverse_difficulty));
}
else
{
return std::numeric_limits<std::uint64_t>::max ();
}
}
double nano::difficulty::to_multiplier (uint64_t const difficulty_a, uint64_t const base_difficulty_a)