blob: 78ff4e9252180443148b5d119754ea831130dc2e [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
#define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_
#include <stdint.h>
#include <memory>
#include "base/bind.h"
#include "base/files/file.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "net/base/completion_once_callback.h"
#include "storage/browser/blob/shareable_file_reference.h"
#include "storage/browser/fileapi/file_stream_reader.h"
#include "storage/browser/fileapi/file_system_url.h"
#include "storage/browser/storage_browser_export.h"
namespace base {
class FilePath;
}
namespace content {
class FileSystemFileStreamReaderTest;
}
namespace storage {
class FileSystemContext;
// Generic FileStreamReader implementation for FileSystem files.
// Note: This generic implementation would work for any filesystems but
// remote filesystem should implement its own reader rather than relying
// on FileSystemOperation::GetSnapshotFile() which may force downloading
// the entire contents for remote files.
class STORAGE_EXPORT FileSystemFileStreamReader
: public storage::FileStreamReader {
public:
~FileSystemFileStreamReader() override;
// FileStreamReader overrides.
int Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) override;
int64_t GetLength(net::Int64CompletionOnceCallback callback) override;
private:
friend class storage::FileStreamReader;
friend class content::FileSystemFileStreamReaderTest;
FileSystemFileStreamReader(FileSystemContext* file_system_context,
const FileSystemURL& url,
int64_t initial_offset,
const base::Time& expected_modification_time);
int CreateSnapshot();
void DidCreateSnapshot(
base::File::Error file_error,
const base::File::Info& file_info,
const base::FilePath& platform_path,
scoped_refptr<storage::ShareableFileReference> file_ref);
void OnRead(int rv);
void OnGetLength(int64_t rv);
net::IOBuffer* read_buf_;
int read_buf_len_;
net::CompletionOnceCallback read_callback_;
net::Int64CompletionOnceCallback get_length_callback_;
scoped_refptr<FileSystemContext> file_system_context_;
FileSystemURL url_;
const int64_t initial_offset_;
const base::Time expected_modification_time_;
std::unique_ptr<storage::FileStreamReader> local_file_reader_;
scoped_refptr<storage::ShareableFileReference> snapshot_ref_;
bool has_pending_create_snapshot_;
base::WeakPtrFactory<FileSystemFileStreamReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(FileSystemFileStreamReader);
};
} // namespace storage
#endif // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_