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1 // Copyright (c) 2011 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_BROWSER_CHROMEOS_FILEAPI_ASYNC_FILE_STREAM_H_ | |
6 #define WEBKIT_BROWSER_CHROMEOS_FILEAPI_ASYNC_FILE_STREAM_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "base/platform_file.h" | |
10 | |
11 namespace fileapi { | |
12 | |
13 using base::PlatformFileError; | |
14 | |
15 // This class is used for implementing Open() in FileUtilAsync. This class | |
16 // is similar to net::FileStream, but supporting only the asynchronous | |
17 // operations and not necessarily relying on PlatformFile. | |
18 class AsyncFileStream { | |
19 public: | |
20 // Used for Read() and Write(). |result| is the return code of the | |
21 // operation, and |length| is the length of data read or written. | |
22 typedef base::Callback<void(PlatformFileError result, | |
23 int64 length)> ReadWriteCallback; | |
24 | |
25 // Used for Seek(). |result| is the return code of the operation. | |
26 typedef base::Callback<void(PlatformFileError)> SeekCallback; | |
27 | |
28 virtual ~AsyncFileStream() {}; | |
29 | |
30 // Reads data from the current stream position. Up to |length| bytes | |
31 // will be read from |buffer|. The memory pointed to by |buffer| must | |
32 // remain valid until the callback is called. On success, | |
33 // PLATFORM_FILE_OK is passed to |callback| with the number of bytes | |
34 // read. On failure, an error code is passed instead. | |
35 virtual void Read(char* buffer, | |
36 int64 length, | |
37 const ReadWriteCallback& callback) = 0; | |
38 | |
39 // Writes data at the current stream position. Up to |length| bytes will | |
40 // be written from |buffer|. The memory pointed to by |buffer| must | |
41 // remain valid until the callback is called. On success, | |
42 // PLATFORM_FILE_OK is passed to |callback| with the number of bytes | |
43 // written. On failure, an error code is passed instead. | |
44 virtual void Write(const char* buffer, | |
45 int64 length, | |
46 const ReadWriteCallback& callback) = 0; | |
47 | |
48 // Moves the stream position. On success, PLATFORM_FILE_OK is passed to | |
49 // |callback|. On error, an error code is passed instead. | |
50 virtual void Seek(int64 offset, | |
51 const SeekCallback& callback) = 0; | |
52 }; | |
53 | |
54 } // namespace fileapi | |
55 | |
56 #endif // WEBKIT_BROWSER_CHROMEOS_FILEAPI_ASYNC_FILE_STREAM_H_ | |
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