tests: Add fuzzing harness for classes/functions in blockfilter.h

1 files changed, 44 insertions, 0 deletions

diff --git a/src/test/fuzz/blockfilter.cpp b/src/test/fuzz/blockfilter.cpp
new file mode 100644
index 0000000000..be9320dcbf
--- /dev/null
+++ b/src/test/fuzz/blockfilter.cpp
@@ -0,0 +1,44 @@
+// 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 <optional.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+    const Optional<BlockFilter> block_filter = ConsumeDeserializable<BlockFilter>(fuzzed_data_provider);
+    if (!block_filter) {
+        return;
+    }
+    {
+        (void)block_filter->ComputeHeader(ConsumeUInt256(fuzzed_data_provider));
+        (void)block_filter->GetBlockHash();
+        (void)block_filter->GetEncodedFilter();
+        (void)block_filter->GetHash();
+    }
+    {
+        const BlockFilterType block_filter_type = block_filter->GetFilterType();
+        (void)BlockFilterTypeName(block_filter_type);
+    }
+    {
+        const GCSFilter gcs_filter = block_filter->GetFilter();
+        (void)gcs_filter.GetN();
+        (void)gcs_filter.GetParams();
+        (void)gcs_filter.GetEncoded();
+        (void)gcs_filter.Match(ConsumeRandomLengthByteVector(fuzzed_data_provider));
+        GCSFilter::ElementSet element_set;
+        while (fuzzed_data_provider.ConsumeBool()) {
+            element_set.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider));
+            gcs_filter.MatchAny(element_set);
+        }
+    }
+}