[rac] Temporarily copy libaddressinput to Chrome.

third_party/libaddressinput/chromium/cpp/src/validating_storage.cc

+// Copyright (C) 2013 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.
+//
+// ValidatingStorage saves data with checksum and timestamp using
+// ValidatingUtil.
+
+#include "validating_storage.h"
+
+#include <libaddressinput/callback.h>
+#include <libaddressinput/storage.h>
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
+
+#include <cassert>
+#include <cstddef>
+#include <ctime>
+#include <string>
+
+#include "validating_util.h"
+
+namespace i18n {
+namespace addressinput {
+
+namespace {
+
+class Helper {
+ public:
+  Helper(const std::string& key,
+         const Storage::Callback& data_ready,
+         const Storage& wrapped_storage)
+      : data_ready_(data_ready),
+        wrapped_data_ready_(BuildCallback(this, &Helper::OnWrappedDataReady)) {
+    wrapped_storage.Get(key, *wrapped_data_ready_);
+  }
+
+ private:
+  ~Helper() {}
+
+  void OnWrappedDataReady(bool success,
+                          const std::string& key,
+                          const std::string& wrapped_data) {
+    std::string data(wrapped_data);
+    if (!success ||
+        !ValidatingUtil::UnwrapTimestamp(&data, time(NULL)) ||
+        !ValidatingUtil::UnwrapChecksum(&data)) {
+      data_ready_(false, key, std::string());
+    } else {
+      data_ready_(true, key, data);
+    }
+    delete this;
+  }
+
+  const Storage::Callback& data_ready_;
+  scoped_ptr<Storage::Callback> wrapped_data_ready_;
+
+  DISALLOW_COPY_AND_ASSIGN(Helper);
+};
+
+}  // namespace
+
+ValidatingStorage::ValidatingStorage(Storage* storage)
+    : wrapped_storage_(storage) {
+  assert(wrapped_storage_ != NULL);
+}
+
+ValidatingStorage::~ValidatingStorage() {}
+
+void ValidatingStorage::Put(const std::string& key, const std::string& data) {
+  wrapped_storage_->Put(key, ValidatingUtil::Wrap(data, time(NULL)));
+}
+
+void ValidatingStorage::Get(const std::string& key,
+                            const Callback& data_ready) const {
+  new Helper(key, data_ready, *wrapped_storage_);
+}
+
+}  // namespace addressinput
+}  // namespace i18n