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/*
* Copyright (C) 2014 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 "BlobDataFileReference.h"
#include "File.h"
#include <wtf/FileSystem.h>
namespace WebCore {
BlobDataFileReference::BlobDataFileReference(const String& path, const String& replacementPath)
: m_path(path)
, m_replacementPath(replacementPath)
{
}
BlobDataFileReference::~BlobDataFileReference()
{
if (!m_replacementPath.isNull())
FileSystem::deleteFile(m_replacementPath);
}
const String& BlobDataFileReference::path()
{
#if ENABLE(FILE_REPLACEMENT)
if (m_replacementShouldBeGenerated)
generateReplacementFile();
#endif
if (!m_replacementPath.isNull())
return m_replacementPath;
return m_path;
}
unsigned long long BlobDataFileReference::size()
{
#if ENABLE(FILE_REPLACEMENT)
if (m_replacementShouldBeGenerated)
generateReplacementFile();
#endif
return m_size;
}
std::optional<WallTime> BlobDataFileReference::expectedModificationTime()
{
#if ENABLE(FILE_REPLACEMENT)
// We do not currently track modifications for generated files, because we have a snapshot.
// Unfortunately, this is inconsistent with regular file handling - File objects should be invalidated when underlying files change.
if (m_replacementShouldBeGenerated || !m_replacementPath.isNull())
return std::nullopt;
#endif
return m_expectedModificationTime;
}
void BlobDataFileReference::startTrackingModifications()
{
// This is not done automatically by the constructor, because BlobDataFileReference is
// also used to pass paths around before registration. Only registered blobs need to pay
// the cost of tracking file modifications.
#if ENABLE(FILE_REPLACEMENT)
m_replacementShouldBeGenerated = File::shouldReplaceFile(m_path);
#endif
// FIXME: Some platforms provide better ways to listen for file system object changes, consider using these.
auto modificationTime = FileSystem::fileModificationTime(m_path);
if (!modificationTime)
return;
m_expectedModificationTime = *modificationTime;
#if ENABLE(FILE_REPLACEMENT)
if (m_replacementShouldBeGenerated)
return;
#endif
// This is a registered blob with a replacement file. Get the size of the replacement file.
auto fileSize = FileSystem::fileSize(m_replacementPath.isNull() ? m_path : m_replacementPath);
if (!fileSize)
return;
m_size = *fileSize;
}
void BlobDataFileReference::prepareForFileAccess()
{
}
void BlobDataFileReference::revokeFileAccess()
{
}
}
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