1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "BlobDataFileReference.h" 28 29#include "File.h" 30#include "FileMetadata.h" 31 32namespace WebCore { 33 34BlobDataFileReference::BlobDataFileReference(const String& path) 35 : m_path(path) 36#if ENABLE(FILE_REPLACEMENT) 37 , m_replacementShouldBeGenerated(false) 38#endif 39 , m_size(0) 40 , m_expectedModificationTime(invalidFileTime()) 41{ 42} 43 44BlobDataFileReference::~BlobDataFileReference() 45{ 46#if ENABLE(FILE_REPLACEMENT) 47 if (!m_replacementPath.isNull()) 48 deleteFile(m_replacementPath); 49#endif 50} 51 52const String& BlobDataFileReference::path() 53{ 54#if ENABLE(FILE_REPLACEMENT) 55 if (m_replacementShouldBeGenerated) 56 generateReplacementFile(); 57 58 if (!m_replacementPath.isNull()) 59 return m_replacementPath; 60#endif 61 62 return m_path; 63} 64 65unsigned long long BlobDataFileReference::size() 66{ 67#if ENABLE(FILE_REPLACEMENT) 68 if (m_replacementShouldBeGenerated) 69 generateReplacementFile(); 70#endif 71 72 return m_size; 73} 74 75double BlobDataFileReference::expectedModificationTime() 76{ 77#if ENABLE(FILE_REPLACEMENT) 78 // We do not currently track modifications for generated files, because we have a snapshot. 79 // Unfortunately, this is inconsistent with regular file handling - File objects should be invalidated when underlying files change. 80 if (m_replacementShouldBeGenerated || !m_replacementPath.isNull()) 81 return invalidFileTime(); 82#endif 83 84 return m_expectedModificationTime; 85} 86 87void BlobDataFileReference::startTrackingModifications() 88{ 89 // This is not done automatically by the constructor, because BlobDataFileReference is 90 // also used to pass paths around before registration. Only registered blobs need to pay 91 // the cost of tracking file modifications. 92 93 ASSERT(!isValidFileTime(m_expectedModificationTime)); 94 95#if ENABLE(FILE_REPLACEMENT) 96 m_replacementShouldBeGenerated = File::shouldReplaceFile(m_path); 97#endif 98 99 // FIXME: Some platforms provide better ways to listen for file system object changes, consider using these. 100 FileMetadata metadata; 101 if (!getFileMetadata(m_path, metadata)) 102 return; 103 104 m_expectedModificationTime = metadata.modificationTime; 105 106#if ENABLE(FILE_REPLACEMENT) 107 if (m_replacementShouldBeGenerated) 108 return; 109#endif 110 111 m_size = metadata.length; 112} 113 114void BlobDataFileReference::prepareForFileAccess() 115{ 116} 117 118void BlobDataFileReference::revokeFileAccess() 119{ 120} 121 122} 123