[libfuzzer] Add fuzzer for third_party/hunspell with dictionary.

third_party/hunspell/fuzz/hunspell_fuzzer.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string>
+
+#include "third_party/hunspell/src/hunspell/hunspell.hxx"
+#include "third_party/hunspell/fuzz/hunspell_fuzzer_dictionary.h"
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  if (!size)
+    return 0;
+  
+  static Hunspell* hunspell = new Hunspell(
+      reinterpret_cast<const unsigned char*>(kHunspellDictionary),
+      sizeof(kHunspellDictionary));
+
+  std::string data_string(reinterpret_cast<const char*>(data), size);
+  hunspell->spell(data_string.c_str());
+
+  char** suggestions = nullptr;
+  int suggetion_length = hunspell->suggest(&suggestions, data_string.c_str());
+  hunspell->free_list(&suggestions, suggetion_length);
+
+  return 0;
+}