Define the Settings interface for a CrashReportDatabase and provide a Mac implementation.

client/settings_mac.h

Index: client/settings_mac.h
diff --git a/client/settings_mac.h b/client/settings_mac.h
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+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// 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.
+
+#ifndef CRASHPAD_CLIENT_SETTINGS_MAC_H_
+#define CRASHPAD_CLIENT_SETTINGS_MAC_H_
+
+#import <Foundation/Foundation.h>
+
+#include "base/files/file_path.h"
+#include "base/mac/scoped_nsobject.h"
+#include "client/settings.h"
+#include "util/file/file_io.h"
+
+namespace crashpad {
+namespace internal {
+
+//! \brief An implementation of the Settings interface, which stores the values
+//!     in a property list (plist) file.
+//!
+//! This class makes use of Foundation, and as such requires the presence of an
+//! autorelease pool to properly manage memory.
+class SettingsMac : public Settings {
+ public:
+  explicit SettingsMac(const base::FilePath& prefs_file);
+  ~SettingsMac() override;
+
+  bool Initialize();
+
+  // Settings:
+  bool GetClientID(std::string* client_id) override;
+  bool GetUploadsEnabled(bool* enabled) override;
+  bool SetUploadsEnabled(bool enabled) override;
+  bool GetLastUploadAttemptTime(time_t* time) override;
+  bool SetLastUploadAttemptTime(time_t time) override;
+
+ private:
+  base::scoped_nsobject<NSMutableDictionary> ReadPlist(FileHandle fd);
+  bool WritePlist(FileHandle fd, NSDictionary* plist);
+
+  base::scoped_nsobject<id> GetSetting(NSString* key);
+  bool SetSetting(NSString* key, NSObject* value);
+
+  const char* prefs_file() { return prefs_file_.value().c_str(); };
+
+  base::FilePath prefs_file_;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsMac);
+};
+
+}  // namespace internal
+}  // namespace crashpad
+
+#endif  // CRASHPAD_CLIENT_SETTINGS_MAC_H_