text: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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 ANDROID_BASE_FILE_H
  #define ANDROID_BASE_FILE_H
  
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <string>
  
  #if !defined(_WIN32) && !defined(O_BINARY)
  #define O_BINARY 0
  #endif
  
  #if defined(__APPLE__)
  /* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */
  typedef off_t off64_t;
  #endif
  
  namespace android {
  namespace base {
  
  bool ReadFdToString(int fd, std::string* content);
  bool ReadFileToString(const std::string& path, std::string* content,
                        bool follow_symlinks = false);
  
  bool WriteStringToFile(const std::string& content, const std::string& path,
                         bool follow_symlinks = false);
  bool WriteStringToFd(const std::string& content, int fd);
  
  #if !defined(_WIN32)
  bool WriteStringToFile(const std::string& content, const std::string& path,
                         mode_t mode, uid_t owner, gid_t group,
                         bool follow_symlinks = false);
  #endif
  
  bool ReadFully(int fd, void* data, size_t byte_count);
  
  // Reads `byte_count` bytes from the file descriptor at the specified offset.
  // Returns false if there was an IO error or EOF was reached before reading `byte_count` bytes.
  //
  // NOTE: On Linux/Mac, this function wraps pread, which provides atomic read support without
  // modifying the read pointer of the file descriptor. On Windows, however, the read pointer does
  // get modified. This means that ReadFullyAtOffset can be used concurrently with other calls to the
  // same function, but concurrently seeking or reading incrementally can lead to unexpected
  // behavior.
  bool ReadFullyAtOffset(int fd, void* data, size_t byte_count, off64_t offset);
  
  bool WriteFully(int fd, const void* data, size_t byte_count);
  
  bool RemoveFileIfExists(const std::string& path, std::string* err = nullptr);
  
  #if !defined(_WIN32)
  bool Realpath(const std::string& path, std::string* result);
  bool Readlink(const std::string& path, std::string* result);
  #endif
  
  std::string GetExecutablePath();
  std::string GetExecutableDirectory();
  
  // Like the regular basename and dirname, but thread-safe on all
  // platforms and capable of correctly handling exotic Windows paths.
  std::string Basename(const std::string& path);
  std::string Dirname(const std::string& path);
  
  }  // namespace base
  }  // namespace android
  
  #endif // ANDROID_BASE_FILE_H
  