Merge #18423: tests: Add fuzzing harness for classes/functions in blockfilter.h. Add integer {de,}serialization fuzzing.

102f3267e9e7925a7ea42f1181303cf1da8ce643 tests: Add fuzzing harness for classes/functions in blockfilter.h (practicalswift)
87d24e67bb8f6a01ff710df4f14cb7d1caf651ae tests: Add integer serialization/deserialization fuzzing harness (practicalswift)

Pull request description:

  Add fuzzing harness for classes/functions in `blockfilter.h`.

  Add integer serialization/deserialization fuzzing harness.

Top commit has no ACKs.

Tree-SHA512: 729e6bc1adf5873a64ca334a0ddc279c6cddf208923ca37cec712e9c73d0216a641045e10084925b055230f9d31fbd85ba61e59e4da3f865a544c5f8afc05e05

1 files changed, 40 insertions, 0 deletions

diff --git a/src/test/fuzz/integer.cpp b/src/test/fuzz/integer.cpp
index 24459c21be..63b9296574 100644
--- a/src/test/fuzz/integer.cpp
+++ b/src/test/fuzz/integer.cpp
@@ -227,4 +227,44 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         (void)HasAllDesirableServiceFlags(service_flags);
         (void)MayHaveUsefulAddressDB(service_flags);
     }
+
+    {
+        CDataStream stream(SER_NETWORK, INIT_PROTO_VERSION);
+
+        ser_writedata64(stream, u64);
+        const uint64_t deserialized_u64 = ser_readdata64(stream);
+        assert(u64 == deserialized_u64 && stream.empty());
+
+        ser_writedata32(stream, u32);
+        const uint32_t deserialized_u32 = ser_readdata32(stream);
+        assert(u32 == deserialized_u32 && stream.empty());
+
+        ser_writedata32be(stream, u32);
+        const uint32_t deserialized_u32be = ser_readdata32be(stream);
+        assert(u32 == deserialized_u32be && stream.empty());
+
+        ser_writedata16(stream, u16);
+        const uint16_t deserialized_u16 = ser_readdata16(stream);
+        assert(u16 == deserialized_u16 && stream.empty());
+
+        ser_writedata16be(stream, u16);
+        const uint16_t deserialized_u16be = ser_readdata16be(stream);
+        assert(u16 == deserialized_u16be && stream.empty());
+
+        ser_writedata8(stream, u8);
+        const uint8_t deserialized_u8 = ser_readdata8(stream);
+        assert(u8 == deserialized_u8 && stream.empty());
+    }
+
+    {
+        CDataStream stream(SER_NETWORK, INIT_PROTO_VERSION);
+
+        WriteCompactSize(stream, u64);
+        try {
+            const uint64_t deserialized_u64 = ReadCompactSize(stream);
+            assert(u64 == deserialized_u64 && stream.empty());
+        }
+        catch (const std::ios_base::failure&) {
+        }
+    }
 }