1/*
2 * Copyright (C) 2015 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef NetworkCacheBlobStorage_h
27#define NetworkCacheBlobStorage_h
28
29#include "NetworkCacheData.h"
30#include "NetworkCacheKey.h"
31#include <wtf/SHA1.h>
32
33namespace WebKit {
34namespace NetworkCache {
35
36// BlobStorage deduplicates the data using SHA1 hash computed over the blob bytes.
37class BlobStorage {
38 WTF_MAKE_NONCOPYABLE(BlobStorage);
39public:
40 BlobStorage(const String& blobDirectoryPath, Salt);
41
42 struct Blob {
43 Data data;
44 SHA1::Digest hash;
45 };
46 // These are all synchronous and should not be used from the main thread.
47 Blob add(const String& path, const Data&);
48 Blob get(const String& path);
49
50 // Blob won't be removed until synchronization.
51 void remove(const String& path);
52
53 unsigned shareCount(const String& path);
54
55 size_t approximateSize() const { return m_approximateSize; }
56
57 void synchronize();
58
59private:
60 String blobDirectoryPath() const;
61 String blobPathForHash(const SHA1::Digest&) const;
62
63 const String m_blobDirectoryPath;
64 const Salt m_salt;
65
66 std::atomic<size_t> m_approximateSize { 0 };
67};
68
69}
70}
71
72#endif
73