diff options
Diffstat (limited to 'src/test/fuzz')
-rw-r--r-- | src/test/fuzz/golomb_rice.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/test/fuzz/golomb_rice.cpp b/src/test/fuzz/golomb_rice.cpp new file mode 100644 index 0000000000..3e20416116 --- /dev/null +++ b/src/test/fuzz/golomb_rice.cpp @@ -0,0 +1,112 @@ +// 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 <blockfilter.h> +#include <serialize.h> +#include <streams.h> +#include <test/fuzz/fuzz.h> +#include <test/fuzz/FuzzedDataProvider.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 MapIntoRange(const uint64_t x, const uint64_t n) +{ + const uint64_t x_hi = x >> 32; + const uint64_t x_lo = x & 0xFFFFFFFF; + const uint64_t n_hi = n >> 32; + const uint64_t n_lo = n & 0xFFFFFFFF; + const uint64_t ac = x_hi * n_hi; + const uint64_t ad = x_hi * n_lo; + const uint64_t bc = x_lo * n_hi; + const uint64_t bd = x_lo * n_lo; + const uint64_t mid34 = (bd >> 32) + (bc & 0xFFFFFFFF) + (ad & 0xFFFFFFFF); + const uint64_t upper64 = ac + (bc >> 32) + (ad >> 32) + (mid34 >> 32); + return upper64; +} + +uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f) +{ + const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL) + .Write(element.data(), element.size()) + .Finalize(); + return MapIntoRange(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 + +void test_one_input(const std::vector<uint8_t>& buffer) +{ + 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)); + } + CVectorWriter stream(SER_NETWORK, 0, golomb_rice_data, 0); + WriteCompactSize(stream, static_cast<uint32_t>(elements.size())); + BitStreamWriter<CVectorWriter> 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; + { + VectorReader stream{SER_NETWORK, 0, golomb_rice_data, 0}; + BitStreamReader<VectorReader> 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); + VectorReader stream{SER_NETWORK, 0, random_bytes, 0}; + uint32_t n; + try { + n = static_cast<uint32_t>(ReadCompactSize(stream)); + } catch (const std::ios_base::failure&) { + return; + } + BitStreamReader<VectorReader> 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&) { + } + } + } +} |