Create CrashReportDatabase interface, a test, and a Mac implementation.

util/mac/xattr.h

 // Copyright 2014 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_UTIL_MAC_XATTR_H_
 #define CRASHPAD_UTIL_MAC_XATTR_H_
 
 #include <time.h>
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/strings/string_piece.h"
 
 namespace crashpad {
 
+//! \brief Tests if an extended attribute is present on a file.

[Mark Mentovai, 2015/01/08 22:38:10]

Meh. I’d rather the ReadXattr-family functions be extended to return a 3-state
enum.

+//!
+//! \param[in] file The path to the file.
+//! \param[in] name The name of the extended attribute to test.
+//!
+//! \return `true` if the attribute exists, `false` if it does not.
+bool HasXattr(const base::FilePath& file, const base::StringPiece& name);
+
 //! \brief Reads an extended attribute on a file.
 //!
 //! \param[in] file The path to the file.
 //! \param[in] name The name of the extended attribute to read.
 //! \param[out] value The value of the attribute.
 //!
 //! \return `true` if the read was successful, with \a value filled in. `false`
 //!     on error, with a message logged.
 bool ReadXattr(const base::FilePath& file,
                const base::StringPiece& name,
@@ skipping 40 matching lines @@
                     time_t* value);
 
 //! \copydoc WriteXattr
 bool WriteXattrTimeT(const base::FilePath& file,
                      const base::StringPiece& name,
                      time_t value);
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MAC_XATTR_H_