1/*
2 * Copyright (C) 2010 Google Inc.  All rights reserved.
3 * Copyright (C) 2010, 2012 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef AsyncFileStream_h
33#define AsyncFileStream_h
34
35#include <wtf/Forward.h>
36#include <wtf/RefCounted.h>
37#include <wtf/RefPtr.h>
38
39namespace WebCore {
40
41class FileStreamClient;
42class FileStream;
43class URL;
44
45class AsyncFileStream : public RefCounted<AsyncFileStream> {
46public:
47    static PassRefPtr<AsyncFileStream> create(FileStreamClient*);
48    ~AsyncFileStream();
49
50    void getSize(const String& path, double expectedModificationTime);
51    void openForRead(const String& path, long long offset, long long length);
52    void openForWrite(const String& path);
53    void close();
54    void read(char* buffer, int length);
55    void write(const URL& blobURL, long long position, int length);
56    void truncate(long long position);
57
58    // Stops the proxy and schedules it to be destructed. All the pending tasks will be aborted and the file stream will be closed.
59    // Note: the caller should deref the instance immediately after calling stop().
60    void stop();
61
62    FileStreamClient* client() const { return m_client; }
63    void setClient(FileStreamClient* client) { m_client = client; }
64
65private:
66    AsyncFileStream(FileStreamClient*);
67
68    RefPtr<FileStream> m_stream;
69    FileStreamClient* m_client;
70};
71
72} // namespace WebCore
73
74#endif // AsyncFileStream_h
75