/* * 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/FileMetadata.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; } 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 WTF::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 metadata = FileSystem::fileMetadataFollowingSymlinks(m_path); if (!metadata) return; m_expectedModificationTime = metadata.value().modificationTime; #if ENABLE(FILE_REPLACEMENT) if (m_replacementShouldBeGenerated) return; #endif // This is a registered blob with a replacement file. Get the Metadata of the replacement file. if (!m_replacementPath.isNull()) { metadata = FileSystem::fileMetadataFollowingSymlinks(m_replacementPath); if (!metadata) return; } m_size = metadata.value().length; } void BlobDataFileReference::prepareForFileAccess() { } void BlobDataFileReference::revokeFileAccess() { } }