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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.
h" | 5 #include "chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.
h" |
6 | 6 |
7 #include "base/memory/scoped_ptr.h" | 7 #include "base/memory/scoped_ptr.h" |
| 8 #include "chrome/browser/chromeos/file_system_provider/fileapi/buffering_file_st
ream_reader.h" |
8 #include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reade
r.h" | 9 #include "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reade
r.h" |
9 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_fi
le_util.h" | 10 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_fi
le_util.h" |
10 #include "content/public/browser/browser_thread.h" | 11 #include "content/public/browser/browser_thread.h" |
11 #include "webkit/browser/blob/file_stream_reader.h" | 12 #include "webkit/browser/blob/file_stream_reader.h" |
12 #include "webkit/browser/fileapi/file_stream_writer.h" | 13 #include "webkit/browser/fileapi/file_stream_writer.h" |
13 #include "webkit/browser/fileapi/file_system_url.h" | 14 #include "webkit/browser/fileapi/file_system_url.h" |
14 | 15 |
15 using content::BrowserThread; | 16 using content::BrowserThread; |
16 | 17 |
17 namespace chromeos { | 18 namespace chromeos { |
18 namespace file_system_provider { | 19 namespace file_system_provider { |
| 20 namespace { |
| 21 |
| 22 // Size of the stream reader internal buffer. At most this number of bytes will |
| 23 // be read ahead of the requested data. |
| 24 const int kReaderBufferSize = 512 * 1024; // 512KB. |
| 25 |
| 26 } // namespace |
19 | 27 |
20 BackendDelegate::BackendDelegate() | 28 BackendDelegate::BackendDelegate() |
21 : async_file_util_(new internal::ProviderAsyncFileUtil) {} | 29 : async_file_util_(new internal::ProviderAsyncFileUtil) {} |
22 | 30 |
23 BackendDelegate::~BackendDelegate() {} | 31 BackendDelegate::~BackendDelegate() {} |
24 | 32 |
25 fileapi::AsyncFileUtil* BackendDelegate::GetAsyncFileUtil( | 33 fileapi::AsyncFileUtil* BackendDelegate::GetAsyncFileUtil( |
26 fileapi::FileSystemType type) { | 34 fileapi::FileSystemType type) { |
27 DCHECK_CURRENTLY_ON(BrowserThread::IO); | 35 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
28 DCHECK_EQ(fileapi::kFileSystemTypeProvided, type); | 36 DCHECK_EQ(fileapi::kFileSystemTypeProvided, type); |
29 return async_file_util_.get(); | 37 return async_file_util_.get(); |
30 } | 38 } |
31 | 39 |
32 scoped_ptr<webkit_blob::FileStreamReader> | 40 scoped_ptr<webkit_blob::FileStreamReader> |
33 BackendDelegate::CreateFileStreamReader( | 41 BackendDelegate::CreateFileStreamReader( |
34 const fileapi::FileSystemURL& url, | 42 const fileapi::FileSystemURL& url, |
35 int64 offset, | 43 int64 offset, |
36 const base::Time& expected_modification_time, | 44 const base::Time& expected_modification_time, |
37 fileapi::FileSystemContext* context) { | 45 fileapi::FileSystemContext* context) { |
38 DCHECK_CURRENTLY_ON(BrowserThread::IO); | 46 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
39 DCHECK_EQ(fileapi::kFileSystemTypeProvided, url.type()); | 47 DCHECK_EQ(fileapi::kFileSystemTypeProvided, url.type()); |
40 | 48 |
41 return scoped_ptr<webkit_blob::FileStreamReader>( | 49 return scoped_ptr<webkit_blob::FileStreamReader>( |
42 new FileStreamReader(context, url, offset, expected_modification_time)); | 50 new BufferingFileStreamReader( |
| 51 scoped_ptr<webkit_blob::FileStreamReader>(new FileStreamReader( |
| 52 context, url, offset, expected_modification_time)), |
| 53 kReaderBufferSize)); |
43 } | 54 } |
44 | 55 |
45 scoped_ptr<fileapi::FileStreamWriter> BackendDelegate::CreateFileStreamWriter( | 56 scoped_ptr<fileapi::FileStreamWriter> BackendDelegate::CreateFileStreamWriter( |
46 const fileapi::FileSystemURL& url, | 57 const fileapi::FileSystemURL& url, |
47 int64 offset, | 58 int64 offset, |
48 fileapi::FileSystemContext* context) { | 59 fileapi::FileSystemContext* context) { |
49 DCHECK_CURRENTLY_ON(BrowserThread::IO); | 60 DCHECK_CURRENTLY_ON(BrowserThread::IO); |
50 DCHECK_EQ(fileapi::kFileSystemTypeProvided, url.type()); | 61 DCHECK_EQ(fileapi::kFileSystemTypeProvided, url.type()); |
51 NOTIMPLEMENTED(); | 62 NOTIMPLEMENTED(); |
52 return scoped_ptr<fileapi::FileStreamWriter>(); | 63 return scoped_ptr<fileapi::FileStreamWriter>(); |
53 } | 64 } |
54 | 65 |
55 } // namespace file_system_provider | 66 } // namespace file_system_provider |
56 } // namespace chromeos | 67 } // namespace chromeos |
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