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      1 /*
      2  * Copyright (C) 2008 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. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/fileapi/File.h"
     28 
     29 #include "platform/FileMetadata.h"
     30 #include "platform/MIMETypeRegistry.h"
     31 #include "public/platform/Platform.h"
     32 #include "public/platform/WebFileUtilities.h"
     33 #include "wtf/CurrentTime.h"
     34 #include "wtf/DateMath.h"
     35 
     36 namespace WebCore {
     37 
     38 static String getContentTypeFromFileName(const String& name, File::ContentTypeLookupPolicy policy)
     39 {
     40     String type;
     41     int index = name.reverseFind('.');
     42     if (index != -1) {
     43         if (policy == File::WellKnownContentTypes)
     44             type = MIMETypeRegistry::getWellKnownMIMETypeForExtension(name.substring(index + 1));
     45         else {
     46             ASSERT(policy == File::AllContentTypes);
     47             type = MIMETypeRegistry::getMIMETypeForExtension(name.substring(index + 1));
     48         }
     49     }
     50     return type;
     51 }
     52 
     53 static PassOwnPtr<BlobData> createBlobDataForFileWithType(const String& path, const String& contentType)
     54 {
     55     OwnPtr<BlobData> blobData = BlobData::create();
     56     blobData->setContentType(contentType);
     57     blobData->appendFile(path);
     58     return blobData.release();
     59 }
     60 
     61 static PassOwnPtr<BlobData> createBlobDataForFile(const String& path, File::ContentTypeLookupPolicy policy)
     62 {
     63     return createBlobDataForFileWithType(path, getContentTypeFromFileName(path, policy));
     64 }
     65 
     66 static PassOwnPtr<BlobData> createBlobDataForFileWithName(const String& path, const String& fileSystemName, File::ContentTypeLookupPolicy policy)
     67 {
     68     return createBlobDataForFileWithType(path, getContentTypeFromFileName(fileSystemName, policy));
     69 }
     70 
     71 static PassOwnPtr<BlobData> createBlobDataForFileWithMetadata(const String& fileSystemName, const FileMetadata& metadata)
     72 {
     73     OwnPtr<BlobData> blobData = BlobData::create();
     74     blobData->setContentType(getContentTypeFromFileName(fileSystemName, File::WellKnownContentTypes));
     75     blobData->appendFile(metadata.platformPath, 0, metadata.length, metadata.modificationTime);
     76     return blobData.release();
     77 }
     78 
     79 static PassOwnPtr<BlobData> createBlobDataForFileSystemURL(const KURL& fileSystemURL, const FileMetadata& metadata)
     80 {
     81     OwnPtr<BlobData> blobData = BlobData::create();
     82     blobData->setContentType(getContentTypeFromFileName(fileSystemURL.path(), File::WellKnownContentTypes));
     83     blobData->appendFileSystemURL(fileSystemURL, 0, metadata.length, metadata.modificationTime);
     84     return blobData.release();
     85 }
     86 
     87 PassRefPtr<File> File::createWithRelativePath(const String& path, const String& relativePath)
     88 {
     89     RefPtr<File> file = adoptRef(new File(path, AllContentTypes));
     90     file->m_relativePath = relativePath;
     91     return file.release();
     92 }
     93 
     94 File::File(const String& path, ContentTypeLookupPolicy policy)
     95     : Blob(BlobDataHandle::create(createBlobDataForFile(path, policy), -1))
     96     , m_hasBackingFile(true)
     97     , m_path(path)
     98     , m_name(blink::Platform::current()->fileUtilities()->baseName(path))
     99     , m_snapshotSize(-1)
    100     , m_snapshotModificationTime(invalidFileTime())
    101 {
    102     ScriptWrappable::init(this);
    103 }
    104 
    105 File::File(const String& path, const String& name, ContentTypeLookupPolicy policy)
    106     : Blob(BlobDataHandle::create(createBlobDataForFileWithName(path, name, policy), -1))
    107     , m_hasBackingFile(true)
    108     , m_path(path)
    109     , m_name(name)
    110     , m_snapshotSize(-1)
    111     , m_snapshotModificationTime(invalidFileTime())
    112 {
    113     ScriptWrappable::init(this);
    114 }
    115 
    116 File::File(const String& path, const String& name, const String& relativePath, bool hasSnaphotData, uint64_t size, double lastModified, PassRefPtr<BlobDataHandle> blobDataHandle)
    117     : Blob(blobDataHandle)
    118     , m_hasBackingFile(!path.isEmpty() || !relativePath.isEmpty())
    119     , m_path(path)
    120     , m_name(name)
    121     , m_snapshotSize(hasSnaphotData ? static_cast<long long>(size) : -1)
    122     , m_snapshotModificationTime(hasSnaphotData ? lastModified : invalidFileTime())
    123     , m_relativePath(relativePath)
    124 {
    125     ScriptWrappable::init(this);
    126 }
    127 
    128 File::File(const String& name, double modificationTime, PassRefPtr<BlobDataHandle> blobDataHandle)
    129     : Blob(blobDataHandle)
    130     , m_hasBackingFile(false)
    131     , m_name(name)
    132     , m_snapshotSize(Blob::size())
    133     , m_snapshotModificationTime(modificationTime)
    134 {
    135     ScriptWrappable::init(this);
    136 }
    137 
    138 File::File(const String& name, const FileMetadata& metadata)
    139     : Blob(BlobDataHandle::create(createBlobDataForFileWithMetadata(name, metadata),  metadata.length))
    140     , m_hasBackingFile(true)
    141     , m_path(metadata.platformPath)
    142     , m_name(name)
    143     , m_snapshotSize(metadata.length)
    144     , m_snapshotModificationTime(metadata.modificationTime)
    145 {
    146     ScriptWrappable::init(this);
    147 }
    148 
    149 File::File(const KURL& fileSystemURL, const FileMetadata& metadata)
    150     : Blob(BlobDataHandle::create(createBlobDataForFileSystemURL(fileSystemURL, metadata), metadata.length))
    151     , m_hasBackingFile(true)
    152     , m_fileSystemURL(fileSystemURL)
    153     , m_snapshotSize(metadata.length)
    154     , m_snapshotModificationTime(metadata.modificationTime)
    155 {
    156     ScriptWrappable::init(this);
    157 }
    158 
    159 double File::lastModifiedDate() const
    160 {
    161     if (hasValidSnapshotMetadata() && isValidFileTime(m_snapshotModificationTime))
    162         return m_snapshotModificationTime * msPerSecond;
    163 
    164     time_t modificationTime;
    165     if (getFileModificationTime(m_path, modificationTime) && isValidFileTime(modificationTime))
    166         return modificationTime * msPerSecond;
    167 
    168     return currentTime() * msPerSecond;
    169 }
    170 
    171 unsigned long long File::size() const
    172 {
    173     if (hasValidSnapshotMetadata())
    174         return m_snapshotSize;
    175 
    176     // FIXME: JavaScript cannot represent sizes as large as unsigned long long, we need to
    177     // come up with an exception to throw if file size is not representable.
    178     long long size;
    179     if (!getFileSize(m_path, size))
    180         return 0;
    181     return static_cast<unsigned long long>(size);
    182 }
    183 
    184 void File::captureSnapshot(long long& snapshotSize, double& snapshotModificationTime) const
    185 {
    186     if (hasValidSnapshotMetadata()) {
    187         snapshotSize = m_snapshotSize;
    188         snapshotModificationTime = m_snapshotModificationTime;
    189         return;
    190     }
    191 
    192     // Obtains a snapshot of the file by capturing its current size and modification time. This is used when we slice a file for the first time.
    193     // If we fail to retrieve the size or modification time, probably due to that the file has been deleted, 0 size is returned.
    194     FileMetadata metadata;
    195     if (!getFileMetadata(m_path, metadata)) {
    196         snapshotSize = 0;
    197         snapshotModificationTime = invalidFileTime();
    198         return;
    199     }
    200 
    201     snapshotSize = metadata.length;
    202     snapshotModificationTime = metadata.modificationTime;
    203 }
    204 
    205 } // namespace WebCore
    206