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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_READER_H_
#define STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_READER_H_
#include <stdint.h>
#include <memory>
#include "base/component_export.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/functional/callback_forward.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/types/pass_key.h"
#include "components/file_access/scoped_file_access.h"
#include "components/file_access/scoped_file_access_delegate.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/file_system/file_stream_reader.h"
namespace base {
class TaskRunner;
}
namespace net {
class FileStream;
}
namespace storage {
// A thin wrapper of net::FileStream with range support for sliced file
// handling.
class COMPONENT_EXPORT(STORAGE_BROWSER) LocalFileStreamReader
: public FileStreamReader {
public:
LocalFileStreamReader(
scoped_refptr<base::TaskRunner> task_runner,
const base::FilePath& file_path,
int64_t initial_offset,
const base::Time& expected_modification_time,
base::PassKey<FileStreamReader> pass_key,
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access);
~LocalFileStreamReader() override;
// FileStreamReader overrides.
int Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int64_t GetLength(net::Int64CompletionOnceCallback callback) override;
private:
void Open(net::CompletionOnceCallback callback);
// Callbacks that are chained from Open for Read.
void OnScopedFileAccessRequested(
net::CompletionOnceCallback callback,
file_access::ScopedFileAccess scoped_file_access);
void DidVerifyForOpen(net::CompletionOnceCallback callback,
file_access::ScopedFileAccess scoped_file_access,
int64_t get_length_result);
void DidOpenFileStream(file_access::ScopedFileAccess /*scoped_file_access*/,
int result);
void DidSeekFileStream(int64_t seek_result);
void DidOpenForRead(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback,
int open_result);
void OnRead(int read_result);
void DidGetFileInfoForGetLength(net::Int64CompletionOnceCallback callback,
base::FileErrorOr<base::File::Info> result);
net::CompletionOnceCallback callback_;
scoped_refptr<base::TaskRunner> task_runner_;
std::unique_ptr<net::FileStream> stream_impl_;
const base::FilePath file_path_;
const int64_t initial_offset_;
const base::Time expected_modification_time_;
bool has_pending_open_ = false;
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access_;
base::WeakPtrFactory<LocalFileStreamReader> weak_factory_{this};
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_LOCAL_FILE_STREAM_READER_H_
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