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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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 #ifndef WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ | 5 #ifndef WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ |
6 #define WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ | 6 #define WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
9 #include "net/base/completion_callback.h" | 9 #include "net/base/completion_callback.h" |
10 #include "webkit/browser/webkit_storage_browser_export.h" | 10 #include "webkit/browser/webkit_storage_browser_export.h" |
11 | 11 |
12 namespace base { | 12 namespace base { |
13 class FilePath; | 13 class FilePath; |
14 class TaskRunner; | 14 class TaskRunner; |
15 } | 15 } |
16 | 16 |
17 namespace net { | 17 namespace net { |
18 class IOBuffer; | 18 class IOBuffer; |
19 } | 19 } |
20 | 20 |
21 namespace fileapi { | 21 namespace fileapi { |
22 | 22 |
23 // A generic interface for writing to a file-like object. | 23 // A generic interface for writing to a file-like object. |
24 class FileStreamWriter { | 24 class FileStreamWriter { |
25 public: | 25 public: |
26 enum OpenOrCreate { OPEN_EXISTING_FILE, CREATE_NEW_FILE }; | |
27 | |
28 // Creates a writer for the existing file in the path |file_path| starting | 26 // Creates a writer for the existing file in the path |file_path| starting |
29 // from |initial_offset|. Uses |task_runner| for async file operations. | 27 // from |initial_offset|. Uses |task_runner| for async file operations. |
30 WEBKIT_STORAGE_BROWSER_EXPORT static FileStreamWriter* CreateForLocalFile( | 28 WEBKIT_STORAGE_BROWSER_EXPORT static FileStreamWriter* CreateForLocalFile( |
31 base::TaskRunner* task_runner, | 29 base::TaskRunner* task_runner, |
32 const base::FilePath& file_path, | 30 const base::FilePath& file_path, |
33 int64 initial_offset, | 31 int64 initial_offset); |
34 OpenOrCreate open_or_create); | |
35 | 32 |
36 // Closes the file. If there's an in-flight operation, it is canceled (i.e., | 33 // Closes the file. If there's an in-flight operation, it is canceled (i.e., |
37 // the callback function associated with the operation is not called). | 34 // the callback function associated with the operation is not called). |
38 virtual ~FileStreamWriter() {} | 35 virtual ~FileStreamWriter() {} |
39 | 36 |
40 // Writes to the current cursor position asynchronously. | 37 // Writes to the current cursor position asynchronously. |
41 // | 38 // |
42 // Up to buf_len bytes will be written. (In other words, partial | 39 // Up to buf_len bytes will be written. (In other words, partial |
43 // writes are allowed.) If the write completed synchronously, it returns | 40 // writes are allowed.) If the write completed synchronously, it returns |
44 // the number of bytes written. If the operation could not be performed, it | 41 // the number of bytes written. If the operation could not be performed, it |
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78 // is returned, and the callback will be run on the thread where Flush() was | 75 // is returned, and the callback will be run on the thread where Flush() was |
79 // called when the flush has completed. | 76 // called when the flush has completed. |
80 // | 77 // |
81 // It is invalid to call Flush while there is an in-flight async operation. | 78 // It is invalid to call Flush while there is an in-flight async operation. |
82 virtual int Flush(const net::CompletionCallback& callback) = 0; | 79 virtual int Flush(const net::CompletionCallback& callback) = 0; |
83 }; | 80 }; |
84 | 81 |
85 } // namespace fileapi | 82 } // namespace fileapi |
86 | 83 |
87 #endif // WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ | 84 #endif // WEBKIT_BROWSER_FILEAPI_FILE_STREAM_WRITER_H_ |
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