// Copyright (c) 2016 The WebM project authors. All Rights Reserved.//// Use of this source code is governed by a BSD-style license// that can be found in the LICENSE file in the root of the source// tree. An additional intellectual property rights grant can be found// in the file PATENTS.  All contributing project authors may// be found in the AUTHORS file in the root of the source tree.#ifndef LIBWEBM_COMMON_FILE_UTIL_H_#define LIBWEBM_COMMON_FILE_UTIL_H_ #include <stdint.h> #include <string> #include "mkvmuxer/mkvmuxertypes.h"  // LIBWEBM_DISALLOW_COPY_AND_ASSIGN() namespace libwebm { // Returns a temporary file name.std::string GetTempFileName(); // Returns size of file specified by |file_name|, or 0 upon failure.uint64_t GetFileSize(const std::string& file_name); // Gets the contents file_name as a string. Returns false on error.bool GetFileContents(const std::string& file_name, std::string* contents); // Manages life of temporary file specified at time of construction. Deletes// file upon destruction.class TempFileDeleter { public:  TempFileDeleter();  explicit TempFileDeleter(std::string file_name) : file_name_(file_name) {}  ~TempFileDeleter();  const std::string& name() const { return file_name_; }  private:  std::string file_name_;  LIBWEBM_DISALLOW_COPY_AND_ASSIGN(TempFileDeleter);}; }  // namespace libwebm #endif  // LIBWEBM_COMMON_FILE_UTIL_H_