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1 // Copyright (c) 2012 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 WEBKIT_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_ | |
6 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_ | |
7 | |
8 #include "base/bind.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/platform_file.h" | |
11 #include "base/time.h" | |
12 #include "webkit/blob/file_stream_reader.h" | |
13 #include "webkit/blob/shareable_file_reference.h" | |
14 #include "webkit/fileapi/file_system_url.h" | |
15 #include "webkit/storage/webkit_storage_export.h" | |
16 | |
17 namespace base { | |
18 class FilePath; | |
19 class SequencedTaskRunner; | |
20 } | |
21 | |
22 namespace webkit_blob { | |
23 class LocalFileStreamReader; | |
24 } | |
25 | |
26 namespace fileapi { | |
27 | |
28 class FileSystemContext; | |
29 | |
30 // TODO(kinaba,satorux): This generic implementation would work for any | |
31 // filesystems but remote filesystem should implement its own reader | |
32 // rather than relying on FileSystemOperation::GetSnapshotFile() which | |
33 // may force downloading the entire contents for remote files. | |
34 class WEBKIT_STORAGE_EXPORT_PRIVATE FileSystemFileStreamReader | |
35 : public webkit_blob::FileStreamReader { | |
36 public: | |
37 // Creates a new FileReader for a filesystem URL |url| form |initial_offset|. | |
38 // |expected_modification_time| specifies the expected last modification if | |
39 // the value is non-null, the reader will check the underlying file's actual | |
40 // modification time to see if the file has been modified, and if it does any | |
41 // succeeding read operations should fail with ERR_UPLOAD_FILE_CHANGED error. | |
42 FileSystemFileStreamReader(FileSystemContext* file_system_context, | |
43 const FileSystemURL& url, | |
44 int64 initial_offset, | |
45 const base::Time& expected_modification_time); | |
46 virtual ~FileSystemFileStreamReader(); | |
47 | |
48 // FileStreamReader overrides. | |
49 virtual int Read(net::IOBuffer* buf, int buf_len, | |
50 const net::CompletionCallback& callback) OVERRIDE; | |
51 virtual int64 GetLength( | |
52 const net::Int64CompletionCallback& callback) OVERRIDE; | |
53 | |
54 private: | |
55 int CreateSnapshot(const base::Closure& callback, | |
56 const net::CompletionCallback& error_callback); | |
57 void DidCreateSnapshot( | |
58 const base::Closure& callback, | |
59 const net::CompletionCallback& error_callback, | |
60 base::PlatformFileError file_error, | |
61 const base::PlatformFileInfo& file_info, | |
62 const base::FilePath& platform_path, | |
63 const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref); | |
64 | |
65 scoped_refptr<FileSystemContext> file_system_context_; | |
66 FileSystemURL url_; | |
67 const int64 initial_offset_; | |
68 const base::Time expected_modification_time_; | |
69 scoped_ptr<webkit_blob::LocalFileStreamReader> local_file_reader_; | |
70 scoped_refptr<webkit_blob::ShareableFileReference> snapshot_ref_; | |
71 bool has_pending_create_snapshot_; | |
72 base::WeakPtrFactory<FileSystemFileStreamReader> weak_factory_; | |
73 | |
74 DISALLOW_COPY_AND_ASSIGN(FileSystemFileStreamReader); | |
75 }; | |
76 | |
77 } // namespace fileapi | |
78 | |
79 #endif // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_STREAM_READER_H_ | |
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