134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FileHandle.h"
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namespace WebCore {
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FileHandle::FileHandle(const String& path, FileSystem::FileOpenMode mode)
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: m_path { path }
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, m_mode { mode }
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{
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}
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FileHandle::FileHandle(FileHandle&& other)
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: m_path { WTFMove(other.m_path) }
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, m_mode { WTFMove(other.m_mode) }
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, m_fileHandle { std::exchange(other.m_fileHandle, FileSystem::invalidPlatformFileHandle) }
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{
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}
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FileHandle::FileHandle(const String& path, FileSystem::FileOpenMode mode, OptionSet<FileSystem::FileLockMode> lockMode)
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: m_path { path }
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, m_mode { mode }
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, m_lockMode { lockMode }
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, m_shouldLock { true }
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{
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}
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FileHandle::~FileHandle()
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{
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close();
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}
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FileHandle& FileHandle::operator=(FileHandle&& other)
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{
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close();
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m_path = WTFMove(other.m_path);
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m_mode = WTFMove(other.m_mode);
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m_fileHandle = std::exchange(other.m_fileHandle, FileSystem::invalidPlatformFileHandle);
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return *this;
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}
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FileHandle::operator bool() const
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{
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return FileSystem::isHandleValid(m_fileHandle);
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}
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bool FileHandle::open(const String& path, FileSystem::FileOpenMode mode)
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{
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if (*this && path == m_path && mode == m_mode)
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return true;
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close();
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m_path = path;
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m_mode = mode;
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return open();
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}
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bool FileHandle::open()
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{
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if (!*this)
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m_fileHandle = m_shouldLock ? FileSystem::openAndLockFile(m_path, m_mode, m_lockMode) : FileSystem::openFile(m_path, m_mode);
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return static_cast<bool>(*this);
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}
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int FileHandle::read(void* data, int length)
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{
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if (!open())
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return -1;
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return FileSystem::readFromFile(m_fileHandle, data, length);
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}
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int FileHandle::write(const void* data, int length)
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{
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if (!open())
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return -1;
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return FileSystem::writeToFile(m_fileHandle, data, length);
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}
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bool FileHandle::printf(const char* format, ...)
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{
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va_list args;
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va_start(args, format);
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va_list preflightArgs;
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va_copy(preflightArgs, args);
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size_t stringLength = vsnprintf(nullptr, 0, format, preflightArgs);
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va_end(preflightArgs);
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Vector<char, 1024> buffer(stringLength + 1);
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vsnprintf(buffer.data(), stringLength + 1, format, args);
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va_end(args);
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return write(buffer.data(), stringLength) >= 0;
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}
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void FileHandle::close()
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{
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if (m_shouldLock && *this) {
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// FileSystem::unlockAndCloseFile requires the file handle to be valid while closeFile does not
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FileSystem::unlockAndCloseFile(m_fileHandle);
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} else
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FileSystem::closeFile(m_fileHandle);
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}
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} // namespace WebCore
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