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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_
#define NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_
#include <memory>
#include "base/files/file_path.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "net/base/net_export.h"
#include "net/disk_cache/disk_cache.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
#include <dirent.h>
#include <sys/types.h>
#else
#include "base/files/file_enumerator.h"
#endif
namespace disk_cache {
// This is similar to base::SimpleFileEnumerator, but the implementation is
// optimized for the big directory use-case on POSIX. See
// https://crbug.com/270762 and https://codereview.chromium.org/22927018.
class NET_EXPORT SimpleFileEnumerator final {
public:
using Entry = BackendFileOperations::FileEnumerationEntry;
explicit SimpleFileEnumerator(const base::FilePath& root_path);
~SimpleFileEnumerator();
// Returns true if we've found an error during enumeration.
bool HasError() const;
// Returns the next item, or nullopt if there are no more results (including
// the error case).
absl::optional<Entry> Next();
private:
#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
struct DirCloser {
void operator()(DIR* dir) { closedir(dir); }
};
const base::FilePath path_;
std::unique_ptr<DIR, DirCloser> dir_;
bool has_error_ = false;
#else
base::FileEnumerator enumerator_;
#endif
};
} // namespace disk_cache
#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_FILE_ENUMERATOR_H_
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