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_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
6#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
7
8#include "base/bind.h"
9#include "base/files/file.h"
10#include "base/memory/ref_counted.h"
11#include "base/memory/weak_ptr.h"
12#include "storage/browser/blob/file_stream_reader.h"
13#include "storage/browser/fileapi/file_system_url.h"
14#include "storage/browser/storage_browser_export.h"
15
16namespace base {
17class FilePath;
18}
19
20namespace storage {
21class FileSystemContext;
22}
23
24class MTPFileStreamReader
25    : public NON_EXPORTED_BASE(storage::FileStreamReader) {
26 public:
27  MTPFileStreamReader(storage::FileSystemContext* file_system_context,
28                      const storage::FileSystemURL& url,
29                      int64 initial_offset,
30                      const base::Time& expected_modification_time,
31                      bool do_media_header_validation);
32
33  virtual ~MTPFileStreamReader();
34
35  // FileStreamReader overrides.
36  virtual int Read(net::IOBuffer* buf, int buf_len,
37                   const net::CompletionCallback& callback) OVERRIDE;
38  virtual int64 GetLength(
39      const net::Int64CompletionCallback& callback) OVERRIDE;
40
41 private:
42  void FinishValidateMediaHeader(
43      net::IOBuffer* header_buf,
44      net::IOBuffer* buf, int buf_len,
45      const net::CompletionCallback& callback,
46      const base::File::Info& file_info,
47      int header_bytes_read);
48
49  void FinishRead(const net::CompletionCallback& callback,
50                  const base::File::Info& file_info, int bytes_read);
51
52  void FinishGetLength(const net::Int64CompletionCallback& callback,
53                       const base::File::Info& file_info);
54
55  scoped_refptr<storage::FileSystemContext> file_system_context_;
56  storage::FileSystemURL url_;
57  int64 current_offset_;
58  const base::Time expected_modification_time_;
59
60  bool media_header_validated_;
61
62  base::WeakPtrFactory<MTPFileStreamReader> weak_factory_;
63
64  DISALLOW_COPY_AND_ASSIGN(MTPFileStreamReader);
65};
66
67#endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
68