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

third_party/hunspell/fuzz/hunspell_fuzzer.cc

Index: third_party/hunspell/fuzz/hunspell_fuzzer.cc
diff --git a/third_party/hunspell/fuzz/hunspell_fuzzer.cc b/third_party/hunspell/fuzz/hunspell_fuzzer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9828df9a4406bc7470406852ed9eb48c91694dc7
--- /dev/null
+++ b/third_party/hunspell/fuzz/hunspell_fuzzer.cc
@@ -0,0 +1,34 @@
+// 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 "third_party/hunspell/src/hunspell/hunspell.hxx"
+
+#include <string>

[please use gerrit instead, 2016/06/01 17:09:17]

This include should be next to <stdint.h>

[mmoroz, 2016/06/02 10:54:36]

Done.

+
+#include "hunspell_fuzzer_dictionary.h"

[please use gerrit instead, 2016/06/01 17:09:17]

All includes should have full path.

#include "third_party/hunspell/fuzz/hunspell_fuzzer_dictionary.h"

[mmoroz, 2016/06/02 10:54:36]

Done.

+
+static Hunspell *CreateHunspell() {

[please use gerrit instead, 2016/06/01 17:09:17]

This function is used only once. You should inline it.

[mmoroz, 2016/06/02 10:54:36]

We disable inlining for fuzzers, so I guess it won't make sense.

[please use gerrit instead, 2016/06/02 16:03:50]

Sorry, when I said "inline", I meant this:

static Hunspell* hunspell = new Hunspell(
    reinterpret_cast<const unsigned char*>(kHunspellDictionary),
    sizeof kHunspellDictionary);

[mmoroz, 2016/06/03 13:07:37]

Done.

+  return new Hunspell(
+      reinterpret_cast<const unsigned char*>(kHunspell_Dictionary),
+      sizeof(kHunspell_Dictionary));
+}
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  if (!size)
+    return 0;
+  
+  static Hunspell *hunspell = CreateHunspell();
+  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;
+}