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https://github.com/bitcoin/bitcoin.git
synced 2025-03-12 02:07:39 +01:00
31ba1af74a
This removes the ability to set an offset in the SpanReader constructor,
as the current code is broken. All call sites use pos=0, so it is actually
unused. If future call sites need it, SpanReader{a, b, c, d} is equivalent
to SpanReader{a, b, c.subspan(d)}.
It also removes the ability to deserialize from SpanReader directly from
the constructor. This too is unused, and can be more idiomatically
simulated using (SpanReader{a, b, c} >> x >> y >> z) instead of
SpanReader{a, b, c, x, y, z}.
112 lines
4 KiB
C++
112 lines
4 KiB
C++
// Copyright (c) 2020 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <blockfilter.h>
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#include <serialize.h>
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#include <streams.h>
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#include <test/fuzz/FuzzedDataProvider.h>
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#include <test/fuzz/fuzz.h>
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#include <test/fuzz/util.h>
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#include <util/bytevectorhash.h>
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#include <util/golombrice.h>
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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#include <iosfwd>
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#include <unordered_set>
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#include <vector>
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namespace {
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uint64_t MapIntoRange(const uint64_t x, const uint64_t n)
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{
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const uint64_t x_hi = x >> 32;
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const uint64_t x_lo = x & 0xFFFFFFFF;
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const uint64_t n_hi = n >> 32;
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const uint64_t n_lo = n & 0xFFFFFFFF;
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const uint64_t ac = x_hi * n_hi;
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const uint64_t ad = x_hi * n_lo;
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const uint64_t bc = x_lo * n_hi;
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const uint64_t bd = x_lo * n_lo;
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const uint64_t mid34 = (bd >> 32) + (bc & 0xFFFFFFFF) + (ad & 0xFFFFFFFF);
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const uint64_t upper64 = ac + (bc >> 32) + (ad >> 32) + (mid34 >> 32);
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return upper64;
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}
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uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f)
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{
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const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL)
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.Write(element.data(), element.size())
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.Finalize();
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return MapIntoRange(hash, f);
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}
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std::vector<uint64_t> BuildHashedSet(const std::unordered_set<std::vector<uint8_t>, ByteVectorHash>& elements, const uint64_t f)
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{
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std::vector<uint64_t> hashed_elements;
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hashed_elements.reserve(elements.size());
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for (const std::vector<uint8_t>& element : elements) {
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hashed_elements.push_back(HashToRange(element, f));
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}
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std::sort(hashed_elements.begin(), hashed_elements.end());
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return hashed_elements;
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}
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} // namespace
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FUZZ_TARGET(golomb_rice)
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{
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FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
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std::vector<uint8_t> golomb_rice_data;
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std::vector<uint64_t> encoded_deltas;
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{
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std::unordered_set<std::vector<uint8_t>, ByteVectorHash> elements;
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const int n = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 512);
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for (int i = 0; i < n; ++i) {
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elements.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider, 16));
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}
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CVectorWriter stream(SER_NETWORK, 0, golomb_rice_data, 0);
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WriteCompactSize(stream, static_cast<uint32_t>(elements.size()));
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BitStreamWriter<CVectorWriter> bitwriter(stream);
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if (!elements.empty()) {
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uint64_t last_value = 0;
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for (const uint64_t value : BuildHashedSet(elements, static_cast<uint64_t>(elements.size()) * static_cast<uint64_t>(BASIC_FILTER_M))) {
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const uint64_t delta = value - last_value;
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encoded_deltas.push_back(delta);
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GolombRiceEncode(bitwriter, BASIC_FILTER_P, delta);
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last_value = value;
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}
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}
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bitwriter.Flush();
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}
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std::vector<uint64_t> decoded_deltas;
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{
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SpanReader stream{SER_NETWORK, 0, golomb_rice_data};
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BitStreamReader<SpanReader> bitreader{stream};
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const uint32_t n = static_cast<uint32_t>(ReadCompactSize(stream));
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for (uint32_t i = 0; i < n; ++i) {
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decoded_deltas.push_back(GolombRiceDecode(bitreader, BASIC_FILTER_P));
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}
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}
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assert(encoded_deltas == decoded_deltas);
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{
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const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider, 1024);
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SpanReader stream{SER_NETWORK, 0, random_bytes};
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uint32_t n;
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try {
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n = static_cast<uint32_t>(ReadCompactSize(stream));
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} catch (const std::ios_base::failure&) {
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return;
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}
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BitStreamReader<SpanReader> bitreader{stream};
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for (uint32_t i = 0; i < std::min<uint32_t>(n, 1024); ++i) {
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try {
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(void)GolombRiceDecode(bitreader, BASIC_FILTER_P);
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} catch (const std::ios_base::failure&) {
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}
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}
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}
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}
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