1  // Copyright (c) 2020-present 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/FuzzedDataProvider.h>
  9  #include <test/fuzz/fuzz.h>
 10  #include <test/fuzz/util.h>
 11  #include <test/util/random.h>
 12  #include <util/bytevectorhash.h>
 13  #include <util/golombrice.h>
 14  
 15  #include <algorithm>
 16  #include <cassert>
 17  #include <cstdint>
 18  #include <iosfwd>
 19  #include <unordered_set>
 20  #include <vector>
 21  
 22  namespace {
 23  
 24  uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f)
 25  {
 26      const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL)
 27                                .Write(element)
 28                                .Finalize();
 29      return FastRange64(hash, f);
 30  }
 31  
 32  std::vector<uint64_t> BuildHashedSet(const std::unordered_set<std::vector<uint8_t>, ByteVectorHash>& elements, const uint64_t f)
 33  {
 34      std::vector<uint64_t> hashed_elements;
 35      hashed_elements.reserve(elements.size());
 36      for (const std::vector<uint8_t>& element : elements) {
 37          hashed_elements.push_back(HashToRange(element, f));
 38      }
 39      std::sort(hashed_elements.begin(), hashed_elements.end());
 40      return hashed_elements;
 41  }
 42  } // namespace
 43  
 44  FUZZ_TARGET(golomb_rice)
 45  {
 46      SeedRandomStateForTest(SeedRand::ZEROS);
 47      FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
 48      std::vector<uint8_t> golomb_rice_data;
 49      std::vector<uint64_t> encoded_deltas;
 50      {
 51          std::unordered_set<std::vector<uint8_t>, ByteVectorHash> elements;
 52          const int n = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 512);
 53          for (int i = 0; i < n; ++i) {
 54              elements.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider, 16));
 55          }
 56          VectorWriter stream{golomb_rice_data, 0};
 57          WriteCompactSize(stream, static_cast<uint32_t>(elements.size()));
 58          BitStreamWriter bitwriter{stream};
 59          if (!elements.empty()) {
 60              uint64_t last_value = 0;
 61              for (const uint64_t value : BuildHashedSet(elements, static_cast<uint64_t>(elements.size()) * static_cast<uint64_t>(BASIC_FILTER_M))) {
 62                  const uint64_t delta = value - last_value;
 63                  encoded_deltas.push_back(delta);
 64                  GolombRiceEncode(bitwriter, BASIC_FILTER_P, delta);
 65                  last_value = value;
 66              }
 67          }
 68          bitwriter.Flush();
 69      }
 70  
 71      std::vector<uint64_t> decoded_deltas;
 72      {
 73          SpanReader stream{golomb_rice_data};
 74          BitStreamReader bitreader{stream};
 75          const uint32_t n = static_cast<uint32_t>(ReadCompactSize(stream));
 76          for (uint32_t i = 0; i < n; ++i) {
 77              decoded_deltas.push_back(GolombRiceDecode(bitreader, BASIC_FILTER_P));
 78          }
 79      }
 80  
 81      assert(encoded_deltas == decoded_deltas);
 82  
 83      {
 84          const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider, 1024);
 85          SpanReader stream{random_bytes};
 86          uint32_t n;
 87          try {
 88              n = static_cast<uint32_t>(ReadCompactSize(stream));
 89          } catch (const std::ios_base::failure&) {
 90              return;
 91          }
 92          BitStreamReader bitreader{stream};
 93          for (uint32_t i = 0; i < std::min<uint32_t>(n, 1024); ++i) {
 94              try {
 95                  (void)GolombRiceDecode(bitreader, BASIC_FILTER_P);
 96              } catch (const std::ios_base::failure&) {
 97              }
 98          }
 99      }
100  }