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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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28
Tests/LibCrypto/TestBigFraction.cpp Normal file
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/*
* Copyright (c) 2024, Tim Ledbetter <timledbetter@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCrypto/BigFraction/BigFraction.h>
#include <LibTest/TestCase.h>
TEST_CASE(roundtrip_from_string)
{
Array valid_number_strings {
"0.1"sv,
"-0.1"sv,
"0.9"sv,
"-0.9"sv,
"1.2"sv,
"-1.2"sv,
"610888968122787804679.305596150292503043363"sv,
"-610888968122787804679.305596150292503043363"sv
};
for (auto valid_number_string : valid_number_strings) {
auto result = TRY_OR_FAIL(Crypto::BigFraction::from_string(valid_number_string));
auto precision = valid_number_string.length() - valid_number_string.find('.').value();
EXPECT_EQ(result.to_byte_string(precision), valid_number_string);
}
}