Alex Vakulenko | e4eec20 | 2017-01-27 14:41:04 -0800 | [diff] [blame^] | 1 | #ifndef ANDROID_DVR_PERFORMANCED_DIRECTORY_READER_H_ |
| 2 | #define ANDROID_DVR_PERFORMANCED_DIRECTORY_READER_H_ |
| 3 | |
| 4 | #include <dirent.h> |
| 5 | #include <errno.h> |
| 6 | #include <fcntl.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <sys/types.h> |
| 9 | |
| 10 | #include <android-base/unique_fd.h> |
| 11 | |
| 12 | namespace android { |
| 13 | namespace dvr { |
| 14 | |
| 15 | // Utility class around readdir() that handles automatic cleanup. |
| 16 | class DirectoryReader { |
| 17 | public: |
| 18 | explicit DirectoryReader(base::unique_fd directory_fd) { |
| 19 | directory_ = fdopendir(directory_fd.get()); |
| 20 | error_ = errno; |
| 21 | if (directory_ != nullptr) |
| 22 | directory_fd.release(); |
| 23 | } |
| 24 | |
| 25 | ~DirectoryReader() { |
| 26 | if (directory_) |
| 27 | closedir(directory_); |
| 28 | } |
| 29 | |
| 30 | bool IsValid() const { return directory_ != nullptr; } |
| 31 | explicit operator bool() const { return IsValid(); } |
| 32 | int GetError() const { return error_; } |
| 33 | |
| 34 | // Returns a pointer to a dirent describing the next directory entry. The |
| 35 | // pointer is only valid unitl the next call to Next() or the DirectoryReader |
| 36 | // is destroyed. Returns nullptr when the end of the directory is reached. |
| 37 | dirent* Next() { |
| 38 | if (directory_) |
| 39 | return readdir(directory_); |
| 40 | else |
| 41 | return nullptr; |
| 42 | } |
| 43 | |
| 44 | private: |
| 45 | DIR* directory_; |
| 46 | int error_; |
| 47 | |
| 48 | DirectoryReader(const DirectoryReader&) = delete; |
| 49 | void operator=(const DirectoryReader&) = delete; |
| 50 | }; |
| 51 | |
| 52 | } // namespace dvr |
| 53 | } // namespace android |
| 54 | |
| 55 | #endif // ANDROID_DVR_PERFORMANCED_DIRECTORY_READER_H_ |