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///////////////////////////////////////////////////////////////////////////////
// Copyright Christopher Kormanyos 2024.
// Distributed under the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// cd /mnt/c/Users/ckorm/Documents/Ks/PC_Software/NumericalPrograms/ExtendedNumberTypes/wide_integer
// clang++ -std=c++20 -g -O2 -Wall -Wextra -fsanitize=fuzzer -I. -I/mnt/c/boost/boost_1_85_0 test/fuzzing/test_fuzzing_mul.cpp -o test_fuzzing_mul
// ./test_fuzzing_mul -max_total_time=300
#include <math/wide_integer/uintwide_t.h>
#include <boost/multiprecision/cpp_int.hpp>
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <vector>
namespace fuzzing
{
using boost_uint_backend_type =
boost::multiprecision::cpp_int_backend<static_cast<unsigned>(UINT32_C(256)),
static_cast<unsigned>(UINT32_C(256)),
boost::multiprecision::unsigned_magnitude>;
using boost_uint_type = boost::multiprecision::number<boost_uint_backend_type,
boost::multiprecision::et_off>;
using local_uint_type = ::math::wide_integer::uint256_t;
auto eval_op(const std::uint8_t* data, std::size_t size) -> bool;
}
auto fuzzing::eval_op(const std::uint8_t* data, std::size_t size) -> bool
{
const std::size_t
max_size
{
static_cast<std::size_t>
(
std::numeric_limits<fuzzing::local_uint_type>::digits / 8
)
};
bool result_is_ok { true };
if((size > std::size_t { UINT8_C(1) }) && (size <= std::size_t { max_size * 2U }))
{
local_uint_type a_local { 0U };
local_uint_type b_local { 0U };
boost_uint_type a_boost { 0U };
boost_uint_type b_boost { 0U };
// Import data into the uintwide_t values.
import_bits
(
a_local,
data,
data + std::size_t { size / 2U },
8U
);
import_bits
(
b_local,
data + std::size_t { size / 2U },
data + size,
8U
);
// Import data into the boost values.
import_bits
(
a_boost,
data,
data + std::size_t { size / 2U },
8U
);
import_bits
(
b_boost,
data + std::size_t { size / 2U },
data + size,
8U
);
local_uint_type result_local { a_local * b_local };
boost_uint_type result_boost { a_boost * b_boost };
std::vector<std::uint8_t> result_data_local(max_size, UINT8_C(0));
std::vector<std::uint8_t> result_data_boost(result_data_local.size(), UINT8_C(0));
export_bits(result_local, result_data_local.data(), 8U);
export_bits(result_boost, result_data_boost.data(), 8U);
// Verify that both uintwide_t as well as boost obtain the same result.
const bool result_op_is_ok =
std::equal
(
result_data_local.cbegin(),
result_data_local.cend(),
result_data_boost.cbegin(),
result_data_boost.cend()
);
result_is_ok = (result_op_is_ok && result_is_ok);
}
// Assert the correct result.
assert(result_is_ok);
return result_is_ok;
}
// The fuzzing entry point.
extern "C"
int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
const bool result_one_mul_is_ok { fuzzing::eval_op(data, size) };
return (result_one_mul_is_ok ? 0 : -1);
}
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