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| 1 | +// Copyright (c) 2020 The Bitcoin Core developers |
| 2 | +// Distributed under the MIT software license, see the accompanying |
| 3 | +// file COPYING or http://www.opensource.org/licenses/mit-license.php. |
| 4 | + |
| 5 | +#include <blockfilter.h> |
| 6 | +#include <serialize.h> |
| 7 | +#include <streams.h> |
| 8 | +#include <test/fuzz/fuzz.h> |
| 9 | +#include <test/fuzz/FuzzedDataProvider.h> |
| 10 | +#include <test/fuzz/util.h> |
| 11 | +#include <util/bytevectorhash.h> |
| 12 | +#include <util/golombrice.h> |
| 13 | + |
| 14 | +#include <algorithm> |
| 15 | +#include <cassert> |
| 16 | +#include <cstdint> |
| 17 | +#include <iosfwd> |
| 18 | +#include <unordered_set> |
| 19 | +#include <vector> |
| 20 | + |
| 21 | +namespace { |
| 22 | +uint64_t MapIntoRange(const uint64_t x, const uint64_t n) |
| 23 | +{ |
| 24 | + const uint64_t x_hi = x >> 32; |
| 25 | + const uint64_t x_lo = x & 0xFFFFFFFF; |
| 26 | + const uint64_t n_hi = n >> 32; |
| 27 | + const uint64_t n_lo = n & 0xFFFFFFFF; |
| 28 | + const uint64_t ac = x_hi * n_hi; |
| 29 | + const uint64_t ad = x_hi * n_lo; |
| 30 | + const uint64_t bc = x_lo * n_hi; |
| 31 | + const uint64_t bd = x_lo * n_lo; |
| 32 | + const uint64_t mid34 = (bd >> 32) + (bc & 0xFFFFFFFF) + (ad & 0xFFFFFFFF); |
| 33 | + const uint64_t upper64 = ac + (bc >> 32) + (ad >> 32) + (mid34 >> 32); |
| 34 | + return upper64; |
| 35 | +} |
| 36 | + |
| 37 | +uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f) |
| 38 | +{ |
| 39 | + const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL) |
| 40 | + .Write(element.data(), element.size()) |
| 41 | + .Finalize(); |
| 42 | + return MapIntoRange(hash, f); |
| 43 | +} |
| 44 | + |
| 45 | +std::vector<uint64_t> BuildHashedSet(const std::unordered_set<std::vector<uint8_t>, ByteVectorHash>& elements, const uint64_t f) |
| 46 | +{ |
| 47 | + std::vector<uint64_t> hashed_elements; |
| 48 | + hashed_elements.reserve(elements.size()); |
| 49 | + for (const std::vector<uint8_t>& element : elements) { |
| 50 | + hashed_elements.push_back(HashToRange(element, f)); |
| 51 | + } |
| 52 | + std::sort(hashed_elements.begin(), hashed_elements.end()); |
| 53 | + return hashed_elements; |
| 54 | +} |
| 55 | +} // namespace |
| 56 | + |
| 57 | +void test_one_input(const std::vector<uint8_t>& buffer) |
| 58 | +{ |
| 59 | + FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size()); |
| 60 | + std::vector<uint8_t> golomb_rice_data; |
| 61 | + std::vector<uint64_t> encoded_deltas; |
| 62 | + { |
| 63 | + std::unordered_set<std::vector<uint8_t>, ByteVectorHash> elements; |
| 64 | + const int n = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 512); |
| 65 | + for (int i = 0; i < n; ++i) { |
| 66 | + elements.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider, 16)); |
| 67 | + } |
| 68 | + CVectorWriter stream(SER_NETWORK, 0, golomb_rice_data, 0); |
| 69 | + WriteCompactSize(stream, static_cast<uint32_t>(elements.size())); |
| 70 | + BitStreamWriter<CVectorWriter> bitwriter(stream); |
| 71 | + if (!elements.empty()) { |
| 72 | + uint64_t last_value = 0; |
| 73 | + for (const uint64_t value : BuildHashedSet(elements, static_cast<uint64_t>(elements.size()) * static_cast<uint64_t>(BASIC_FILTER_M))) { |
| 74 | + const uint64_t delta = value - last_value; |
| 75 | + encoded_deltas.push_back(delta); |
| 76 | + GolombRiceEncode(bitwriter, BASIC_FILTER_P, delta); |
| 77 | + last_value = value; |
| 78 | + } |
| 79 | + } |
| 80 | + bitwriter.Flush(); |
| 81 | + } |
| 82 | + |
| 83 | + std::vector<uint64_t> decoded_deltas; |
| 84 | + { |
| 85 | + VectorReader stream{SER_NETWORK, 0, golomb_rice_data, 0}; |
| 86 | + BitStreamReader<VectorReader> bitreader(stream); |
| 87 | + const uint32_t n = static_cast<uint32_t>(ReadCompactSize(stream)); |
| 88 | + for (uint32_t i = 0; i < n; ++i) { |
| 89 | + decoded_deltas.push_back(GolombRiceDecode(bitreader, BASIC_FILTER_P)); |
| 90 | + } |
| 91 | + } |
| 92 | + |
| 93 | + assert(encoded_deltas == decoded_deltas); |
| 94 | + |
| 95 | + { |
| 96 | + const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider, 1024); |
| 97 | + VectorReader stream{SER_NETWORK, 0, random_bytes, 0}; |
| 98 | + uint32_t n; |
| 99 | + try { |
| 100 | + n = static_cast<uint32_t>(ReadCompactSize(stream)); |
| 101 | + } catch (const std::ios_base::failure&) { |
| 102 | + return; |
| 103 | + } |
| 104 | + BitStreamReader<VectorReader> bitreader(stream); |
| 105 | + for (uint32_t i = 0; i < std::min<uint32_t>(n, 1024); ++i) { |
| 106 | + try { |
| 107 | + (void)GolombRiceDecode(bitreader, BASIC_FILTER_P); |
| 108 | + } catch (const std::ios_base::failure&) { |
| 109 | + } |
| 110 | + } |
| 111 | + } |
| 112 | +} |
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