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LibCrypto: Parse negative input correctly in BigFraction::from_string()

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Previously, when calling `BigFraction::from_string()`, the fractional
part of the number was always treated as positive. This led to an
incorrect result if the input string was negative.
This commit is contained in:
Tim Ledbetter 2024-01-14 06:14:56 +00:00 • committed by Jelle Raaijmakers
parent e0fd5beb36
commit d545fb2b60
3 changed files with 32 additions and 0 deletions
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3
Userland/Libraries/LibCrypto/BigFraction/BigFraction.cpp
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@ -36,6 +36,9 @@ ErrorOr<BigFraction> BigFraction::from_string(StringView sv)
auto fractional_part = TRY(SignedBigInteger::from_base(10, fraction_part_view));
auto fraction_length = UnsignedBigInteger(static_cast<u64>(fraction_part_view.length()));
if (!sv.is_empty() && sv[0] == '-')
fractional_part.negate();
return BigFraction(move(integer_part)) + BigFraction(move(fractional_part), NumberTheory::Power("10"_bigint, move(fraction_length)));
}