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Side by Side Diff: webkit/blob/file_stream_reader.h

Issue 15746017: Move webkit/blob to new locations. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 7 years, 6 months ago
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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_BLOB_FILE_STREAM_READER_H_
6 #define WEBKIT_BLOB_FILE_STREAM_READER_H_
7
8 #include "base/basictypes.h"
9 #include "base/compiler_specific.h"
10 #include "net/base/completion_callback.h"
11 #include "webkit/storage/webkit_storage_export.h"
12
13 namespace net {
14 class IOBuffer;
15 }
16
17 namespace webkit_blob {
18
19 // A generic interface for reading a file-like object.
20 class WEBKIT_STORAGE_EXPORT FileStreamReader {
21 public:
22 // It is valid to delete the reader at any time. If the stream is deleted
23 // while it has a pending read, its callback will not be called.
24 virtual ~FileStreamReader() {}
25
26 // Reads from the current cursor position asynchronously.
27 //
28 // Up to buf_len bytes will be copied into buf. (In other words, partial
29 // reads are allowed.) Returns the number of bytes copied, 0 if at
30 // end-of-file, or an error code if the operation could not be performed.
31 // If the read could not complete synchronously, then ERR_IO_PENDING is
32 // returned, and the callback will be run on the thread where Read()
33 // was called, when the read has completed.
34 //
35 // It is invalid to call Read while there is an in-flight Read operation.
36 //
37 // If the stream is deleted while it has an in-flight Read operation
38 // |callback| will not be called.
39 virtual int Read(net::IOBuffer* buf, int buf_len,
40 const net::CompletionCallback& callback) = 0;
41
42 // Returns the length of the file if it could successfully retrieve the
43 // file info *and* its last modification time equals to
44 // expected modification time (rv >= 0 cases).
45 // Otherwise, a negative error code is returned (rv < 0 cases).
46 // If the stream is deleted while it has an in-flight GetLength operation
47 // |callback| will not be called.
48 // Note that the return type is int64 to return a larger file's size (a file
49 // larger than 2G) but an error code should fit in the int range (may be
50 // smaller than int64 range).
51 virtual int64 GetLength(const net::Int64CompletionCallback& callback) = 0;
52 };
53
54 } // namespace webkit_blob
55
56 #endif // WEBKIT_BLOB_FILE_STREAM_READER_H_
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