Add fuzz target for address_formatter in libaddressinput

Bug: 1009109
Change-Id: If20f8bd11e5eadd7d436be0eb0bd272477ee99f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866099Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707663}

third_party/libaddressinput/BUILD.gn

@@ -308,3 +308,13 @@ fuzzer_test("libaddressinput_parse_format_rule_fuzzer") {
   ]
   dict = "//third_party/libaddressinput/fuzz/data/fmt.dict"
 }
+
+fuzzer_test("libaddressinput_address_formatter_fuzzer") {
+  sources = [
+    "fuzz/address_formatter_fuzzer.cc",
+  ]
+  deps = [
+    ":libaddressinput",
+    ":util",
+  ]
+}

third_party/libaddressinput/fuzz/address_formatter_fuzzer.cc

+// Copyright 2019 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 <stdint.h>
+#include <string>
+
+#include <fuzzer/FuzzedDataProvider.h>
+
+#include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_data.h"
+#include "third_party/libaddressinput/src/cpp/include/libaddressinput/address_formatter.h"
+
+namespace {
+
+constexpr size_t kMaxFieldLength = 128;
+
+}  // namespace
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  FuzzedDataProvider provider(data, size);
+
+  i18n::addressinput::AddressData address;
+  address.region_code = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.administrative_area =
+      provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.locality = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.dependent_locality =
+      provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.postal_code = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.sorting_code = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.language_code = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.organization = provider.ConsumeRandomLengthString(kMaxFieldLength);
+  address.recipient = provider.ConsumeRandomLengthString(kMaxFieldLength);
+
+  while (provider.remaining_bytes() > 0) {
+    address.address_line.push_back(
+        provider.ConsumeRandomLengthString(kMaxFieldLength));
+  }
+
+  std::vector<std::string> output_multiline;
+  i18n::addressinput::GetFormattedNationalAddress(address, &output_multiline);
+
+  std::string output;
+  i18n::addressinput::GetFormattedNationalAddressLine(address, &output);
+  i18n::addressinput::GetStreetAddressLinesAsSingleLine(address, &output);
+  return 0;
+}