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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SerializedNFA.h"
#include "NFA.h"
#if ENABLE(CONTENT_EXTENSIONS)
namespace WebCore {
namespace ContentExtensions {
template<typename T>
bool writeAllToFile(FileSystem::PlatformFileHandle file, const T& container)
{
auto bytes = reinterpret_cast<const uint8_t*>(container.data());
size_t bytesLength = container.size() * sizeof(container[0]);
auto end = bytes + bytesLength;
while (bytes < end) {
auto written = FileSystem::writeToFile(file, bytes, bytesLength);
if (written == -1)
return false;
bytes += written;
bytesLength -= written;
}
return true;
}
std::optional<SerializedNFA> SerializedNFA::serialize(NFA&& nfa)
{
auto file = FileSystem::invalidPlatformFileHandle;
auto filename = FileSystem::openTemporaryFile("SerializedNFA"_s, file);
if (!FileSystem::isHandleValid(file))
return std::nullopt;
bool wroteSuccessfully = writeAllToFile(file, nfa.nodes)
&& writeAllToFile(file, nfa.transitions)
&& writeAllToFile(file, nfa.targets)
&& writeAllToFile(file, nfa.epsilonTransitionsTargets)
&& writeAllToFile(file, nfa.actions);
if (!wroteSuccessfully) {
FileSystem::closeFile(file);
FileSystem::deleteFile(filename);
return std::nullopt;
}
bool mappedSuccessfully = false;
FileSystem::MappedFileData mappedFile(file, FileSystem::MappedFileMode::Private, mappedSuccessfully);
FileSystem::closeFile(file);
FileSystem::deleteFile(filename);
if (!mappedSuccessfully)
return std::nullopt;
Metadata metadata {
nfa.nodes.size(),
nfa.transitions.size(),
nfa.targets.size(),
nfa.epsilonTransitionsTargets.size(),
nfa.actions.size(),
0,
nfa.nodes.size() * sizeof(nfa.nodes[0]),
nfa.nodes.size() * sizeof(nfa.nodes[0])
+ nfa.transitions.size() * sizeof(nfa.transitions[0]),
nfa.nodes.size() * sizeof(nfa.nodes[0])
+ nfa.transitions.size() * sizeof(nfa.transitions[0])
+ nfa.targets.size() * sizeof(nfa.targets[0]),
nfa.nodes.size() * sizeof(nfa.nodes[0])
+ nfa.transitions.size() * sizeof(nfa.transitions[0])
+ nfa.targets.size() * sizeof(nfa.targets[0])
+ nfa.epsilonTransitionsTargets.size() * sizeof(nfa.epsilonTransitionsTargets[0])
};
nfa.clear();
return {{ WTFMove(mappedFile), WTFMove(metadata) }};
}
SerializedNFA::SerializedNFA(FileSystem::MappedFileData&& file, Metadata&& metadata)
: m_file(WTFMove(file))
, m_metadata(WTFMove(metadata))
{
}
template<typename T>
const T* SerializedNFA::pointerAtOffsetInFile(size_t offset) const
{
return reinterpret_cast<const T*>(static_cast<const uint8_t*>(m_file.data()) + offset);
}
auto SerializedNFA::nodes() const -> const Range<ImmutableNFANode>
{
return { pointerAtOffsetInFile<ImmutableNFANode>(m_metadata.nodesOffset), m_metadata.nodesSize };
}
auto SerializedNFA::transitions() const -> const Range<ImmutableRange<char>>
{
return { pointerAtOffsetInFile<ImmutableRange<char>>(m_metadata.transitionsOffset), m_metadata.transitionsSize };
}
auto SerializedNFA::targets() const -> const Range<uint32_t>
{
return { pointerAtOffsetInFile<uint32_t>(m_metadata.targetsOffset), m_metadata.targetsSize };
}
auto SerializedNFA::epsilonTransitionsTargets() const -> const Range<uint32_t>
{
return { pointerAtOffsetInFile<uint32_t>(m_metadata.epsilonTransitionsTargetsOffset), m_metadata.epsilonTransitionsTargetsSize };
}
auto SerializedNFA::actions() const -> const Range<uint64_t>
{
return { pointerAtOffsetInFile<uint64_t>(m_metadata.actionsOffset), m_metadata.actionsSize };
}
} // namespace ContentExtensions
} // namespace WebCore
#endif // ENABLE(CONTENT_EXTENSIONS)