timedata.cpp

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// Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <timedata.h>
 
#include <cstdint>
#include <string>
#include <vector>
 
FUZZ_TARGET(timedata)
{
    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
    const unsigned int max_size = fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, 1000);
    // A max_size of 0 implies no limit, so cap the max number of insertions to avoid timeouts
    auto max_to_insert = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 4000);
    // Divide by 2 to avoid signed integer overflow in .median()
    const int64_t initial_value = fuzzed_data_provider.ConsumeIntegral<int64_t>() / 2;
    CMedianFilter<int64_t> median_filter{max_size, initial_value};
    while (fuzzed_data_provider.remaining_bytes() > 0 && --max_to_insert >= 0) {
        (void)median_filter.median();
        assert(median_filter.size() > 0);
        assert(static_cast<size_t>(median_filter.size()) == median_filter.sorted().size());
        assert(static_cast<unsigned int>(median_filter.size()) <= max_size || max_size == 0);
        // Divide by 2 to avoid signed integer overflow in .median()
        median_filter.input(fuzzed_data_provider.ConsumeIntegral<int64_t>() / 2);
    }
}