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-rw-r--r--src/test/fuzz/golomb_rice.cpp112
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&) {
+ }
+ }
+ }
+}