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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_sdiv.cpp -o test_fuzzing_sdiv
// ./test_fuzzing_sdiv -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 <random>
#include <sstream>
#include <vector>
namespace fuzzing
{
auto pseudo_random_sign_bit() -> int
{
static unsigned seed_prescaler { };
static std::mt19937 engine { };
if((seed_prescaler++ % 0x10000U) == 0U)
{
std::random_device rd { };
engine.seed(rd());
}
// Create a uniform distribution for the bit position (0 to 1).
static std::uniform_int_distribution<int> bit_dist(0, 1);
// Generate a pseudo-random sign bit.
return bit_dist(engine);
}
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;
using boost_sint_backend_type =
boost::multiprecision::cpp_int_backend<static_cast<unsigned>(UINT32_C(256)),
static_cast<unsigned>(UINT32_C(256)),
boost::multiprecision::signed_magnitude>;
using boost_sint_type = boost::multiprecision::number<boost_sint_backend_type,
boost::multiprecision::et_off>;
using local_sint_type = ::math::wide_integer::int256_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 };
// 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
);
if(a_local + 256U < b_local)
{
std::swap(a_local, b_local);
}
if(b_local != 0U)
{
local_sint_type a_signed_local { a_local };
local_sint_type b_signed_local { b_local };
const int
sign_mixer
{
(pseudo_random_sign_bit() << 1U) | pseudo_random_sign_bit()
};
if (sign_mixer == 0) { }
else if(sign_mixer == 1) { a_signed_local = -a_signed_local; }
else if(sign_mixer == 2) { b_signed_local = -b_signed_local; }
else { a_signed_local = -a_signed_local; b_signed_local = -b_signed_local; }
std::stringstream strm_a_local { };
std::stringstream strm_b_local { };
strm_a_local << a_signed_local;
strm_b_local << b_signed_local;
boost_sint_type a_signed_boost { strm_a_local.str() };
boost_sint_type b_signed_boost { strm_b_local.str() };
local_sint_type result_signed_local { a_signed_local / b_signed_local };
boost_sint_type result_signed_boost { a_signed_boost / b_signed_boost };
std::vector<std::uint8_t> result_signed_data_local(max_size, UINT8_C(0));
std::vector<std::uint8_t> result_signed_data_boost(result_signed_data_local.size(), UINT8_C(0));
export_bits(result_signed_local, result_signed_data_local.data(), 8U);
export_bits(result_signed_boost, result_signed_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_signed_data_local.cbegin(),
result_signed_data_local.cend(),
result_signed_data_boost.cbegin(),
result_signed_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_div_is_ok { fuzzing::eval_op(data, size) };
return (result_one_div_is_ok ? 0 : -1);
}
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