1/*
2 * Copyright (C) 2017-2018 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#include "config.h"
27#include "PersistencyUtils.h"
28
29#include "Logging.h"
30#include <WebCore/SharedBuffer.h>
31#include <wtf/FileSystem.h>
32#include <wtf/RunLoop.h>
33
34namespace WebKit {
35
36using namespace WebCore;
37
38std::unique_ptr<KeyedDecoder> createForFile(const String& path)
39{
40 ASSERT(!RunLoop::isMain());
41
42 auto handle = FileSystem::openAndLockFile(path, FileSystem::FileOpenMode::Read);
43 if (handle == FileSystem::invalidPlatformFileHandle)
44 return nullptr;
45
46 long long fileSize = 0;
47 if (!FileSystem::getFileSize(handle, fileSize) || !fileSize) {
48 FileSystem::unlockAndCloseFile(handle);
49 return nullptr;
50 }
51
52 size_t bytesToRead;
53 if (!WTF::convertSafely(fileSize, bytesToRead)) {
54 FileSystem::unlockAndCloseFile(handle);
55 return nullptr;
56 }
57
58 Vector<char> buffer(bytesToRead);
59 size_t totalBytesRead = FileSystem::readFromFile(handle, buffer.data(), buffer.size());
60
61 FileSystem::unlockAndCloseFile(handle);
62
63 if (totalBytesRead != bytesToRead)
64 return nullptr;
65
66 // FIXME: We should try to modify the constructor to pass &&.
67 return KeyedDecoder::decoder(reinterpret_cast<const uint8_t*>(buffer.data()), buffer.size());
68}
69
70void writeToDisk(std::unique_ptr<KeyedEncoder>&& encoder, String&& path)
71{
72 ASSERT(!RunLoop::isMain());
73
74 auto rawData = encoder->finishEncoding();
75 if (!rawData)
76 return;
77
78 FileSystem::PlatformFileHandle handle = FileSystem::openAndLockFile(path, FileSystem::FileOpenMode::Write);
79 if (handle == FileSystem::invalidPlatformFileHandle)
80 return;
81
82 auto writtenBytes = FileSystem::writeToFile(handle, rawData->data(), rawData->size());
83 FileSystem::unlockAndCloseFile(handle);
84
85 if (writtenBytes != static_cast<int64_t>(rawData->size()))
86 RELEASE_LOG_ERROR(DiskPersistency, "Disk persistency: We only wrote %d out of %zu bytes to disk", static_cast<unsigned>(writtenBytes), rawData->size());
87}
88
89} // namespace WebKit
90