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// Copyright (c) 2020-2022 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 <blockfilter.h>
#include <serialize.h>
#include <streams.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <util/bytevectorhash.h>
#include <util/golombrice.h>
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <iosfwd>
#include <unordered_set>
#include <vector>
namespace {
uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f)
{
const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL)
.Write(element)
.Finalize();
return FastRange64(hash, f);
}
std::vector<uint64_t> BuildHashedSet(const std::unordered_set<std::vector<uint8_t>, ByteVectorHash>& elements, const uint64_t f)
{
std::vector<uint64_t> hashed_elements;
hashed_elements.reserve(elements.size());
for (const std::vector<uint8_t>& element : elements) {
hashed_elements.push_back(HashToRange(element, f));
}
std::sort(hashed_elements.begin(), hashed_elements.end());
return hashed_elements;
}
} // namespace
FUZZ_TARGET(golomb_rice)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
std::vector<uint8_t> golomb_rice_data;
std::vector<uint64_t> encoded_deltas;
{
std::unordered_set<std::vector<uint8_t>, ByteVectorHash> elements;
const int n = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 512);
for (int i = 0; i < n; ++i) {
elements.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider, 16));
}
VectorWriter stream{golomb_rice_data, 0};
WriteCompactSize(stream, static_cast<uint32_t>(elements.size()));
BitStreamWriter bitwriter{stream};
if (!elements.empty()) {
uint64_t last_value = 0;
for (const uint64_t value : BuildHashedSet(elements, static_cast<uint64_t>(elements.size()) * static_cast<uint64_t>(BASIC_FILTER_M))) {
const uint64_t delta = value - last_value;
encoded_deltas.push_back(delta);
GolombRiceEncode(bitwriter, BASIC_FILTER_P, delta);
last_value = value;
}
}
bitwriter.Flush();
}
std::vector<uint64_t> decoded_deltas;
{
SpanReader stream{golomb_rice_data};
BitStreamReader bitreader{stream};
const uint32_t n = static_cast<uint32_t>(ReadCompactSize(stream));
for (uint32_t i = 0; i < n; ++i) {
decoded_deltas.push_back(GolombRiceDecode(bitreader, BASIC_FILTER_P));
}
}
assert(encoded_deltas == decoded_deltas);
{
const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider, 1024);
SpanReader stream{random_bytes};
uint32_t n;
try {
n = static_cast<uint32_t>(ReadCompactSize(stream));
} catch (const std::ios_base::failure&) {
return;
}
BitStreamReader bitreader{stream};
for (uint32_t i = 0; i < std::min<uint32_t>(n, 1024); ++i) {
try {
(void)GolombRiceDecode(bitreader, BASIC_FILTER_P);
} catch (const std::ios_base::failure&) {
}
}
}
}
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