Add harness

.github/workflows/mayhem.yml

@@ -59,7 +59,8 @@ jobs:
       fail-fast: false
       matrix:
         mayhemfile:
-          - mayhem/Mayhemfile
+          - mayhem/Mayhemfile_compare
+          - mayhem/Mayhemfile_pbf-decoder
 
     steps:
       - uses: actions/checkout@v3

mayhem/Dockerfile

@@ -1,12 +1,14 @@
 FROM --platform=linux/amd64 ubuntu:22.04 as builder
 
 RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential cmake
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential cmake clang
 
 COPY . /repo
 WORKDIR /repo/build
 RUN cmake ..
 RUN make -j8
+RUN clang++ /repo/mayhem/fuzz_compare.cpp -fsanitize=fuzzer,address -I /repo/include/protozero/ -o /fuzz
 
 FROM ubuntu:22.04 as package
 COPY --from=builder /repo/build/tools/pbf-decoder /
+COPY --from=builder /fuzz /fuzz_compare

mayhem/Mayhemfile_compare

@@ -0,0 +1,6 @@
+project: protozero
+target: compare
+
+cmds:
+  - cmd: /fuzz_compare
+    libfuzzer: true

mayhem/fuzz_compare.cpp

@@ -0,0 +1,19 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <climits>
+
+#include <fuzzer/FuzzedDataProvider.h>
+#include "data_view.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    FuzzedDataProvider provider(data, size);
+    std::string str1 = provider.ConsumeRandomLengthString();
+    std::string str2 = provider.ConsumeRandomLengthString();
+    protozero::data_view dv1(str1);
+    protozero::data_view dv2(str2);
+
+    dv1.compare(dv2);
+
+    return 0;
+}