1 // Copyright 2022 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_ 6 #define NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_ 7 8 #include <memory> 9 #include <optional> 10 11 #include "base/files/file_path.h" 12 #include "base/time/time.h" 13 #include "build/build_config.h" 14 #include "net/base/net_export.h" 15 #include "net/disk_cache/disk_cache.h" 16 17 #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA) 18 #include <dirent.h> 19 #include <sys/types.h> 20 #else 21 #include "base/files/file_enumerator.h" 22 #endif 23 24 namespace disk_cache { 25 26 // This is similar to base::SimpleFileEnumerator, but the implementation is 27 // optimized for the big directory use-case on POSIX. See 28 // https://crbug.com/270762 and https://codereview.chromium.org/22927018. 29 class NET_EXPORT SimpleFileEnumerator final { 30 public: 31 using Entry = BackendFileOperations::FileEnumerationEntry; 32 33 explicit SimpleFileEnumerator(const base::FilePath& root_path); 34 ~SimpleFileEnumerator(); 35 36 // Returns true if we've found an error during enumeration. 37 bool HasError() const; 38 39 // Returns the next item, or nullopt if there are no more results (including 40 // the error case). 41 std::optional<Entry> Next(); 42 43 private: 44 #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA) 45 struct DirCloser { operatorDirCloser46 void operator()(DIR* dir) { closedir(dir); } 47 }; 48 const base::FilePath path_; 49 std::unique_ptr<DIR, DirCloser> dir_; 50 bool has_error_ = false; 51 #else 52 base::FileEnumerator enumerator_; 53 #endif 54 }; 55 56 } // namespace disk_cache 57 58 #endif // NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_ 59