read_file.h revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
1// Copyright 2014 The Chromium Authors. All rights reserved.
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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_
6#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_
7
8#include "base/files/file.h"
9#include "base/memory/ref_counted.h"
10#include "base/memory/scoped_ptr.h"
11#include "chrome/browser/chromeos/file_system_provider/operations/operation.h"
12#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
13#include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
14#include "chrome/browser/chromeos/file_system_provider/request_value.h"
15#include "net/base/io_buffer.h"
16#include "storage/browser/fileapi/async_file_util.h"
17
18namespace base {
19class FilePath;
20}  // namespace base
21
22namespace extensions {
23class EventRouter;
24}  // namespace extensions
25
26namespace chromeos {
27namespace file_system_provider {
28namespace operations {
29
30// Bridge between fileapi read file and providing extension's read fil request.
31// Created per request.
32class ReadFile : public Operation {
33 public:
34  ReadFile(
35      extensions::EventRouter* event_router,
36      const ProvidedFileSystemInfo& file_system_info,
37      int file_handle,
38      scoped_refptr<net::IOBuffer> buffer,
39      int64 offset,
40      int length,
41      const ProvidedFileSystemInterface::ReadChunkReceivedCallback& callback);
42  virtual ~ReadFile();
43
44  // Operation overrides.
45  virtual bool Execute(int request_id) OVERRIDE;
46  virtual void OnSuccess(int request_id,
47                         scoped_ptr<RequestValue> result,
48                         bool has_more) OVERRIDE;
49  virtual void OnError(int request_id,
50                       scoped_ptr<RequestValue> result,
51                       base::File::Error error) OVERRIDE;
52
53 private:
54  int file_handle_;
55  scoped_refptr<net::IOBuffer> buffer_;
56  int64 offset_;
57  int length_;
58  int64 current_offset_;
59  const ProvidedFileSystemInterface::ReadChunkReceivedCallback callback_;
60
61  DISALLOW_COPY_AND_ASSIGN(ReadFile);
62};
63
64}  // namespace operations
65}  // namespace file_system_provider
66}  // namespace chromeos
67
68#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_READ_FILE_H_
69