tests: Add fuzzing harness for bloom filter class CBloomFilter

1 files changed, 39 insertions, 0 deletions

diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
new file mode 100644
index 0000000000..62907c7e0b
--- /dev/null
+++ b/src/test/fuzz/util.h
@@ -0,0 +1,39 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_TEST_FUZZ_UTIL_H
+#define BITCOIN_TEST_FUZZ_UTIL_H
+
+#include <attributes.h>
+#include <optional.h>
+#include <serialize.h>
+#include <streams.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <version.h>
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+NODISCARD inline std::vector<uint8_t> ConsumeRandomLengthByteVector(FuzzedDataProvider& fuzzed_data_provider, size_t max_length = 4096) noexcept
+{
+    const std::string s = fuzzed_data_provider.ConsumeRandomLengthString(max_length);
+    return {s.begin(), s.end()};
+}
+
+template <typename T>
+NODISCARD inline Optional<T> ConsumeDeserializable(FuzzedDataProvider& fuzzed_data_provider, size_t max_length = 4096) noexcept
+{
+    const std::vector<uint8_t>& buffer = ConsumeRandomLengthByteVector(fuzzed_data_provider, max_length);
+    CDataStream ds{buffer, SER_NETWORK, INIT_PROTO_VERSION};
+    T obj;
+    try {
+        ds >> obj;
+    } catch (const std::ios_base::failure&) {
+        return nullopt;
+    }
+    return obj;
+}
+
+#endif // BITCOIN_TEST_FUZZ_UTIL_H