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// Copyright (c) 2021 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 <minisketch.h>
#include <node/minisketchwrapper.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <util/check.h>
#include <map>
#include <numeric>
namespace {
Minisketch MakeFuzzMinisketch32(size_t capacity, uint32_t impl)
{
return Assert(Minisketch(32, impl, capacity));
}
} // namespace
FUZZ_TARGET(minisketch)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
const auto capacity{fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 200)};
const uint32_t impl{fuzzed_data_provider.ConsumeIntegralInRange<uint32_t>(0, Minisketch::MaxImplementation())};
if (!Minisketch::ImplementationSupported(32, impl)) return;
Minisketch sketch_a{MakeFuzzMinisketch32(capacity, impl)};
Minisketch sketch_b{MakeFuzzMinisketch32(capacity, impl)};
sketch_a.SetSeed(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
sketch_b.SetSeed(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
// Fill two sets and keep the difference in a map
std::map<uint32_t, bool> diff;
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000)
{
const auto entry{fuzzed_data_provider.ConsumeIntegralInRange<uint32_t>(1, std::numeric_limits<uint32_t>::max() - 1)};
const auto KeepDiff{[&] {
bool& mut{diff[entry]};
mut = !mut;
}};
CallOneOf(
fuzzed_data_provider,
[&] {
sketch_a.Add(entry);
KeepDiff();
},
[&] {
sketch_b.Add(entry);
KeepDiff();
},
[&] {
sketch_a.Add(entry);
sketch_b.Add(entry);
});
}
const auto num_diff{std::accumulate(diff.begin(), diff.end(), size_t{0}, [](auto n, const auto& e) { return n + e.second; })};
Minisketch sketch_ar{MakeFuzzMinisketch32(capacity, impl)};
Minisketch sketch_br{MakeFuzzMinisketch32(capacity, impl)};
sketch_ar.SetSeed(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
sketch_br.SetSeed(fuzzed_data_provider.ConsumeIntegral<uint64_t>());
sketch_ar.Deserialize(sketch_a.Serialize());
sketch_br.Deserialize(sketch_b.Serialize());
Minisketch sketch_diff{std::move(fuzzed_data_provider.ConsumeBool() ? sketch_a : sketch_ar)};
sketch_diff.Merge(fuzzed_data_provider.ConsumeBool() ? sketch_b : sketch_br);
if (capacity >= num_diff) {
const auto max_elements{fuzzed_data_provider.ConsumeIntegralInRange<size_t>(num_diff, capacity)};
const auto dec{*Assert(sketch_diff.Decode(max_elements))};
Assert(dec.size() == num_diff);
for (auto d : dec) {
Assert(diff.at(d));
}
}
}
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