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// 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_BLOB_LOCAL_FILE_STREAM_READER_H_
#define STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "storage/browser/fileapi/file_stream_reader.h"
#include "storage/browser/storage_browser_export.h"
namespace base {
class TaskRunner;
}
namespace content {
class LocalFileStreamReaderTest;
}
namespace net {
class FileStream;
}
namespace storage {
// A thin wrapper of net::FileStream with range support for sliced file
// handling.
class STORAGE_EXPORT LocalFileStreamReader
: public NON_EXPORTED_BASE(FileStreamReader) {
public:
~LocalFileStreamReader() override;
// FileStreamReader overrides.
int Read(net::IOBuffer* buf,
int buf_len,
const net::CompletionCallback& callback) override;
int64 GetLength(const net::Int64CompletionCallback& callback) override;
private:
friend class FileStreamReader;
friend class content::LocalFileStreamReaderTest;
LocalFileStreamReader(base::TaskRunner* task_runner,
const base::FilePath& file_path,
int64 initial_offset,
const base::Time& expected_modification_time);
int Open(const net::CompletionCallback& callback);
// Callbacks that are chained from Open for Read.
void DidVerifyForOpen(const net::CompletionCallback& callback,
int64 get_length_result);
void DidOpenFileStream(const net::CompletionCallback& callback,
int result);
void DidSeekFileStream(const net::CompletionCallback& callback,
int64 seek_result);
void DidOpenForRead(net::IOBuffer* buf,
int buf_len,
const net::CompletionCallback& callback,
int open_result);
void DidGetFileInfoForGetLength(const net::Int64CompletionCallback& callback,
base::File::Error error,
const base::File::Info& file_info);
scoped_refptr<base::TaskRunner> task_runner_;
scoped_ptr<net::FileStream> stream_impl_;
const base::FilePath file_path_;
const int64 initial_offset_;
const base::Time expected_modification_time_;
bool has_pending_open_;
base::WeakPtrFactory<LocalFileStreamReader> weak_factory_;
};
} // namespace storage
#endif // STORAGE_BROWSER_BLOB_LOCAL_FILE_STREAM_READER_H_
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