temporary_file_stream.h revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
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
3// found in the LICENSE file.
4
5#ifndef CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
6#define CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
7
8#include "base/callback_forward.h"
9#include "base/files/file.h"
10#include "base/memory/scoped_ptr.h"
11#include "content/common/content_export.h"
12
13namespace net {
14class FileStream;
15}
16
17namespace webkit_blob {
18class ShareableFileReference;
19}
20
21namespace content {
22
23typedef base::Callback<void(base::File::Error,
24                            scoped_ptr<net::FileStream>,
25                            webkit_blob::ShareableFileReference*)>
26    CreateTemporaryFileStreamCallback;
27
28// Creates a temporary file and asynchronously calls |callback| with a
29// net::FileStream and webkit_blob::ShareableFileReference. The file is deleted
30// when the webkit_blob::ShareableFileReference is deleted. Note it is the
31// consumer's responsibility to ensure the webkit_blob::ShareableFileReference
32// stays in scope until net::FileStream has finished closing the file. On error,
33// |callback| is called with an error in the first parameter.
34//
35// This function may only be called on the IO thread.
36//
37// TODO(davidben): Juggling the net::FileStream and
38// webkit_blob::ShareableFileReference lifetimes is a nuisance. The two should
39// be tied together so the consumer need not deal with it.
40CONTENT_EXPORT void CreateTemporaryFileStream(
41    const CreateTemporaryFileStreamCallback& callback);
42
43}  // namespace content
44
45#endif  // CONTENT_BROWSER_LOADER_TEMPORARY_FILE_STREAM_H_
46