Added fuzzer. This is first step in merging work from OSS-Fuzz into upstream. (#2548)

cpp/test/phonenumbers/fuzz_phone.cc

@@ -0,0 +1,48 @@
+/* Copyright 2020 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+#include "phonenumbers/phonenumbermatcher.h"
+#include <string>
+#include <vector>
+
+#include <unicode/unistr.h>
+
+#include "phonenumbers/base/basictypes.h"
+#include "phonenumbers/base/memory/scoped_ptr.h"
+#include "phonenumbers/base/memory/singleton.h"
+#include "phonenumbers/default_logger.h"
+#include "phonenumbers/phonenumber.h"
+#include "phonenumbers/phonenumber.pb.h"
+#include "phonenumbers/phonenumbermatch.h"
+#include "phonenumbers/phonenumberutil.h"
+#include "phonenumbers/stringutil.h"
+
+#include <fuzzer/FuzzedDataProvider.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    FuzzedDataProvider fuzzed_data(data, size);
+
+    std::string input = fuzzed_data.ConsumeRandomLengthString();
+    std::string input2 = fuzzed_data.ConsumeRandomLengthString();
+
+    i18n::phonenumbers::PhoneNumberUtil *phone_util = i18n::phonenumbers::PhoneNumberUtil::GetInstance();
+    i18n::phonenumbers::PhoneNumber parsed;
+
+    phone_util->Parse(input, input2, &parsed);
+    phone_util->IsValidNumber(parsed);
+    phone_util->GetCountryCodeForRegion(input);
+
+    return 0;
+}