118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/*
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* Copyright (C) 2010 Google 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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* OF 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 "FileStream.h"
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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FileStream::FileStream()
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: m_handle(FileSystem::invalidPlatformFileHandle)
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, m_bytesProcessed(0)
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, m_totalBytesToRead(0)
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{
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}
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FileStream::~FileStream()
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{
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close();
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}
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long long FileStream::getSize(const String& path, std::optional<WallTime> expectedModificationTime)
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{
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// Check the modification time for the possible file change.
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auto modificationTime = FileSystem::fileModificationTime(path);
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if (!modificationTime)
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return -1;
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if (expectedModificationTime) {
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if (expectedModificationTime->secondsSinceEpoch().secondsAs<time_t>() != modificationTime->secondsSinceEpoch().secondsAs<time_t>())
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return -1;
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}
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// Now get the file size.
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auto length = FileSystem::fileSize(path);
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if (!length)
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return -1;
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return *length;
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}
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bool FileStream::openForRead(const String& path, long long offset, long long length)
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{
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if (FileSystem::isHandleValid(m_handle))
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return true;
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// Open the file.
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m_handle = FileSystem::openFile(path, FileSystem::FileOpenMode::Read);
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if (!FileSystem::isHandleValid(m_handle))
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return false;
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// Jump to the beginning position if the file has been sliced.
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if (offset > 0) {
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if (FileSystem::seekFile(m_handle, offset, FileSystem::FileSeekOrigin::Beginning) < 0)
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return false;
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}
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m_totalBytesToRead = length;
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m_bytesProcessed = 0;
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return true;
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}
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void FileStream::close()
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{
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if (FileSystem::isHandleValid(m_handle)) {
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FileSystem::closeFile(m_handle);
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m_handle = FileSystem::invalidPlatformFileHandle;
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}
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}
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int FileStream::read(void* buffer, int bufferSize)
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{
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if (!FileSystem::isHandleValid(m_handle))
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return -1;
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long long remaining = m_totalBytesToRead - m_bytesProcessed;
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int bytesToRead = (remaining < bufferSize) ? static_cast<int>(remaining) : bufferSize;
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int bytesRead = 0;
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if (bytesToRead > 0)
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bytesRead = FileSystem::readFromFile(m_handle, buffer, bytesToRead);
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if (bytesRead < 0)
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return -1;
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if (bytesRead > 0)
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m_bytesProcessed += bytesRead;
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return bytesRead;
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}
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} // namespace WebCore
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