Add ClusterFuzzLite integration

.clusterfuzzlite/Dockerfile

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+FROM gcr.io/oss-fuzz-base/base-builder
+RUN apt-get update && apt-get install -y make autoconf automake libtool
+
+COPY . $SRC/simdzone
+COPY .clusterfuzzlite/build.sh $SRC/build.sh
+WORKDIR $SRC/simdzone

.clusterfuzzlite/README.md

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+# ClusterFuzzLite set up
+This folder contains a fuzzing set for [ClusterFuzzLite](https://google.github.io/clusterfuzzlite).
+

.clusterfuzzlite/build.sh

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+#!/bin/bash -eu
+mkdir build
+cd build
+cmake ..
+make
+
+# Copy all fuzzer executables to $OUT/
+$CC $CFLAGS $LIB_FUZZING_ENGINE \
+  $SRC/simdzone/.clusterfuzzlite/zone_parse_string_fuzzer.c \
+  -o $OUT/zone_parse_string_fuzzer \
+  -I$SRC/simdzone/include \
+  -I$SRC/simdzone/build/include \
+  $SRC/simdzone/build/libzone.a

.clusterfuzzlite/project.yaml

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+language: c

.clusterfuzzlite/zone_parse_string_fuzzer.c

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+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "zone.h"
+
+static int32_t add_rr(zone_parser_t *parser, const zone_name_t *owner,
+                      uint16_t type, uint16_t class, uint32_t ttl,
+                      uint16_t rdlength, const uint8_t *rdata,
+                      void *user_data) {
+  (void)parser;
+  (void)owner;
+  (void)type;
+  (void)class;
+  (void)ttl;
+  (void)rdlength;
+  (void)rdata;
+  (void)user_data;
+  return ZONE_SUCCESS;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  size_t size_of_input = size + ZONE_BLOCK_SIZE + 1;
+  char *null_terminated = (char*)malloc(size_of_input);
+  memcpy(null_terminated, data, size);
+  null_terminated[size] = '\0';
+
+  zone_parser_t parser = {0};
+  zone_name_buffer_t name;
+  zone_rdata_buffer_t rdata;
+  zone_buffers_t buffers = {1, &name, &rdata};
+  zone_options_t options = {0};
+
+  options.accept.callback = add_rr;
+  options.origin = "example.com.";
+  options.default_ttl = 3600;
+  options.default_class = 1;
+
+  zone_parse_string(&parser, &options, &buffers, null_terminated, size, NULL);
+
+  free(null_terminated);
+  return 0;
+}

.github/workflows/cflite_pr.yml

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+name: ClusterFuzzLite PR fuzzing
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [ main ]
+permissions: read-all
+jobs:
+  PR:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sanitizer: [address]
+    steps:
+    - name: Build Fuzzers (${{ matrix.sanitizer }})
+      id: build
+      uses: google/clusterfuzzlite/actions/build_fuzzers@v1
+      with:
+        sanitizer: ${{ matrix.sanitizer }}
+        language: c
+        bad-build-check: false
+    - name: Run Fuzzers (${{ matrix.sanitizer }})
+      id: run
+      uses: google/clusterfuzzlite/actions/run_fuzzers@v1
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        fuzz-seconds: 180
+        mode: 'code-change'
+        report-unreproducible-crashes: false
+        sanitizer: ${{ matrix.sanitizer }}