third_party/WebKit/Source/core/fileapi/File.cpp - chromium/src - Git at Google

 /*
  * Copyright (C) 2008 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. ``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
  * 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 "core/fileapi/File.h"

 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/fileapi/FilePropertyBag.h"
 #include "platform/FileMetadata.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/blob/BlobData.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebFileUtilities.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/DateMath.h"

 namespace blink {

 static String getContentTypeFromFileName(const String& name, File::ContentTypeLookupPolicy policy)
 {
     String type;
     int index = name.reverseFind('.');
     if (index != -1) {
         if (policy == File::WellKnownContentTypes) {
             type = MIMETypeRegistry::getWellKnownMIMETypeForExtension(name.substring(index + 1));
         } else {
             ASSERT(policy == File::AllContentTypes);
             type = MIMETypeRegistry::getMIMETypeForExtension(name.substring(index + 1));
         }
     }
     return type;
 }

 static PassOwnPtr<BlobData> createBlobDataForFileWithType(const String& path, const String& contentType)
 {
     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(contentType);
     blobData->appendFile(path);
     return blobData.release();
 }

 static PassOwnPtr<BlobData> createBlobDataForFile(const String& path, File::ContentTypeLookupPolicy policy)
 {
     return createBlobDataForFileWithType(path, getContentTypeFromFileName(path, policy));
 }

 static PassOwnPtr<BlobData> createBlobDataForFileWithName(const String& path, const String& fileSystemName, File::ContentTypeLookupPolicy policy)
 {
     return createBlobDataForFileWithType(path, getContentTypeFromFileName(fileSystemName, policy));
 }

 static PassOwnPtr<BlobData> createBlobDataForFileWithMetadata(const String& fileSystemName, const FileMetadata& metadata)
 {
     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(getContentTypeFromFileName(fileSystemName, File::WellKnownContentTypes));
     blobData->appendFile(metadata.platformPath, 0, metadata.length, metadata.modificationTime / msPerSecond);
     return blobData.release();
 }

 static PassOwnPtr<BlobData> createBlobDataForFileSystemURL(const KURL& fileSystemURL, const FileMetadata& metadata)
 {
     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(getContentTypeFromFileName(fileSystemURL.path(), File::WellKnownContentTypes));
     blobData->appendFileSystemURL(fileSystemURL, 0, metadata.length, metadata.modificationTime / msPerSecond);
     return blobData.release();
 }

 // static
 File* File::create(const HeapVector<BlobOrStringOrArrayBufferViewOrArrayBuffer>& fileBits, const String& fileName, const FilePropertyBag& options, ExceptionState& exceptionState)
 {
     ASSERT(options.hasType());
     if (!options.type().containsOnlyASCII()) {
         exceptionState.throwDOMException(SyntaxError, "The 'type' property must consist of ASCII characters.");
         return nullptr;
     }

     double lastModified;
     if (options.hasLastModified())
         lastModified = static_cast<double>(options.lastModified());
     else
         lastModified = currentTimeMS();
     ASSERT(options.hasEndings());
     bool normalizeLineEndingsToNative = options.endings() == "native";

     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(options.type().lower());
     populateBlobData(blobData.get(), fileBits, normalizeLineEndingsToNative);

     long long fileSize = blobData->length();
     return File::create(fileName, lastModified, BlobDataHandle::create(blobData.release(), fileSize));
 }

 File* File::createWithRelativePath(const String& path, const String& relativePath)
 {
     File* file = new File(path, File::AllContentTypes, File::IsUserVisible);
     file->m_relativePath = relativePath;
     return file;
 }

 File::File(const String& path, ContentTypeLookupPolicy policy, UserVisibility userVisibility)
     : Blob(BlobDataHandle::create(createBlobDataForFile(path, policy), -1))
     , m_hasBackingFile(true)
     , m_userVisibility(userVisibility)
     , m_path(path)
     , m_name(Platform::current()->fileUtilities()->baseName(path))
     , m_snapshotSize(-1)
     , m_snapshotModificationTimeMS(invalidFileTime())
 {
 }

 File::File(const String& path, const String& name, ContentTypeLookupPolicy policy, UserVisibility userVisibility)
     : Blob(BlobDataHandle::create(createBlobDataForFileWithName(path, name, policy), -1))
     , m_hasBackingFile(true)
     , m_userVisibility(userVisibility)
     , m_path(path)
     , m_name(name)
     , m_snapshotSize(-1)
     , m_snapshotModificationTimeMS(invalidFileTime())
 {
 }

 File::File(const String& path, const String& name, const String& relativePath, UserVisibility userVisibility, bool hasSnaphotData, uint64_t size, double lastModified, PassRefPtr<BlobDataHandle> blobDataHandle)
     : Blob(blobDataHandle)
     , m_hasBackingFile(!path.isEmpty() || !relativePath.isEmpty())
     , m_userVisibility(userVisibility)
     , m_path(path)
     , m_name(name)
     , m_snapshotSize(hasSnaphotData ? static_cast<long long>(size) : -1)
     , m_snapshotModificationTimeMS(hasSnaphotData ? lastModified : invalidFileTime())
     , m_relativePath(relativePath)
 {
 }

 File::File(const String& name, double modificationTimeMS, PassRefPtr<BlobDataHandle> blobDataHandle)
     : Blob(blobDataHandle)
     , m_hasBackingFile(false)
     , m_userVisibility(File::IsNotUserVisible)
     , m_name(name)
     , m_snapshotSize(Blob::size())
     , m_snapshotModificationTimeMS(modificationTimeMS)
 {
 }

 File::File(const String& name, const FileMetadata& metadata, UserVisibility userVisibility)
     : Blob(BlobDataHandle::create(createBlobDataForFileWithMetadata(name, metadata), metadata.length))
     , m_hasBackingFile(true)
     , m_userVisibility(userVisibility)
     , m_path(metadata.platformPath)
     , m_name(name)
     , m_snapshotSize(metadata.length)
     , m_snapshotModificationTimeMS(metadata.modificationTime)
 {
 }

 File::File(const KURL& fileSystemURL, const FileMetadata& metadata, UserVisibility userVisibility)
     : Blob(BlobDataHandle::create(createBlobDataForFileSystemURL(fileSystemURL, metadata), metadata.length))
     , m_hasBackingFile(false)
     , m_userVisibility(userVisibility)
     , m_name(decodeURLEscapeSequences(fileSystemURL.lastPathComponent()))
     , m_fileSystemURL(fileSystemURL)
     , m_snapshotSize(metadata.length)
     , m_snapshotModificationTimeMS(metadata.modificationTime)
 {
 }

 File::File(const File& other)
     : Blob(other.blobDataHandle())
     , m_hasBackingFile(other.m_hasBackingFile)
     , m_userVisibility(other.m_userVisibility)
     , m_path(other.m_path)
     , m_name(other.m_name)
     , m_fileSystemURL(other.m_fileSystemURL)
     , m_snapshotSize(other.m_snapshotSize)
     , m_snapshotModificationTimeMS(other.m_snapshotModificationTimeMS)
     , m_relativePath(other.m_relativePath)
 {
 }

 File* File::clone(const String& name) const
 {
     File* file = new File(*this);
     if (!name.isNull())
         file->m_name = name;
     return file;
 }

 double File::lastModifiedMS() const
 {
     if (hasValidSnapshotMetadata() && isValidFileTime(m_snapshotModificationTimeMS))
         return m_snapshotModificationTimeMS;

     double modificationTimeMS;
     if (hasBackingFile() && getFileModificationTime(m_path, modificationTimeMS) && isValidFileTime(modificationTimeMS))
         return modificationTimeMS;

     return currentTimeMS();
 }

 long long File::lastModified() const
 {
     double modifiedDate = lastModifiedMS();

     // The getter should return the current time when the last modification time isn't known.
     if (!isValidFileTime(modifiedDate))
         modifiedDate = currentTimeMS();

     // lastModified returns a number, not a Date instance,
     // http://dev.w3.org/2006/webapi/FileAPI/#file-attrs
     return floor(modifiedDate);
 }

 double File::lastModifiedDate() const
 {
     double modifiedDate = lastModifiedMS();

     // The getter should return the current time when the last modification time isn't known.
     if (!isValidFileTime(modifiedDate))
         modifiedDate = currentTimeMS();

     // lastModifiedDate returns a Date instance,
     // http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate
     return modifiedDate;
 }

 unsigned long long File::size() const
 {
     if (hasValidSnapshotMetadata())
         return m_snapshotSize;

     // FIXME: JavaScript cannot represent sizes as large as unsigned long long, we need to
     // come up with an exception to throw if file size is not representable.
     long long size;
     if (!hasBackingFile() || !getFileSize(m_path, size))
         return 0;
     return static_cast<unsigned long long>(size);
 }

 Blob* File::slice(long long start, long long end, const String& contentType, ExceptionState& exceptionState) const
 {
     if (hasBeenClosed()) {
         exceptionState.throwDOMException(InvalidStateError, "File has been closed.");
         return nullptr;
     }

     if (!m_hasBackingFile)
         return Blob::slice(start, end, contentType, exceptionState);

     // FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
     long long size;
     double modificationTimeMS;
     captureSnapshot(size, modificationTimeMS);
     clampSliceOffsets(size, start, end);

     long long length = end - start;
     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(contentType);
     if (!m_fileSystemURL.isEmpty()) {
         blobData->appendFileSystemURL(m_fileSystemURL, start, length, modificationTimeMS / msPerSecond);
     } else {
         ASSERT(!m_path.isEmpty());
         blobData->appendFile(m_path, start, length, modificationTimeMS / msPerSecond);
     }
     return Blob::create(BlobDataHandle::create(blobData.release(), length));
 }

 void File::captureSnapshot(long long& snapshotSize, double& snapshotModificationTimeMS) const
 {
     if (hasValidSnapshotMetadata()) {
         snapshotSize = m_snapshotSize;
         snapshotModificationTimeMS = m_snapshotModificationTimeMS;
         return;
     }

     // 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.
     // If we fail to retrieve the size or modification time, probably due to that the file has been deleted, 0 size is returned.
     FileMetadata metadata;
     if (!hasBackingFile() || !getFileMetadata(m_path, metadata)) {
         snapshotSize = 0;
         snapshotModificationTimeMS = invalidFileTime();
         return;
     }

     snapshotSize = metadata.length;
     snapshotModificationTimeMS = metadata.modificationTime;
 }

 void File::close(ExecutionContext* executionContext, ExceptionState& exceptionState)
 {
     if (hasBeenClosed()) {
         exceptionState.throwDOMException(InvalidStateError, "Blob has been closed.");
         return;
     }

     // Reset the File to its closed representation, an empty
     // Blob. The name isn't cleared, as it should still be
     // available.
     m_hasBackingFile = false;
     m_path = String();
     m_fileSystemURL = KURL();
     invalidateSnapshotMetadata();
     m_relativePath = String();
     Blob::close(executionContext, exceptionState);
 }

 void File::appendTo(BlobData& blobData) const
 {
     if (!m_hasBackingFile) {
         Blob::appendTo(blobData);
         return;
     }

     // FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
     long long size;
     double modificationTimeMS;
     captureSnapshot(size, modificationTimeMS);
     if (!m_fileSystemURL.isEmpty()) {
         blobData.appendFileSystemURL(m_fileSystemURL, 0, size, modificationTimeMS / msPerSecond);
         return;
     }
     ASSERT(!m_path.isEmpty());
     blobData.appendFile(m_path, 0, size, modificationTimeMS / msPerSecond);
 }

 bool File::hasSameSource(const File& other) const
 {
     if (m_hasBackingFile != other.m_hasBackingFile)
         return false;

     if (m_hasBackingFile)
         return m_path == other.m_path;

     if (m_fileSystemURL.isEmpty() != other.m_fileSystemURL.isEmpty())
         return false;

     if (!m_fileSystemURL.isEmpty())
         return m_fileSystemURL == other.m_fileSystemURL;

     return uuid() == other.uuid();
 }

 } // namespace blink
	/*
	* Copyright (C) 2008 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. ``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
	* 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 "core/fileapi/File.h"

	#include "bindings/core/v8/ExceptionState.h"
	#include "core/dom/ExceptionCode.h"
	#include "core/fileapi/FilePropertyBag.h"
	#include "platform/FileMetadata.h"
	#include "platform/MIMETypeRegistry.h"
	#include "platform/blob/BlobData.h"
	#include "public/platform/Platform.h"
	#include "public/platform/WebFileUtilities.h"
	#include "wtf/CurrentTime.h"
	#include "wtf/DateMath.h"

	namespace blink {

	static String getContentTypeFromFileName(const String& name, File::ContentTypeLookupPolicy policy)
	{
	String type;
	int index = name.reverseFind('.');
	if (index != -1) {
	if (policy == File::WellKnownContentTypes) {
	type = MIMETypeRegistry::getWellKnownMIMETypeForExtension(name.substring(index + 1));
	} else {
	ASSERT(policy == File::AllContentTypes);
	type = MIMETypeRegistry::getMIMETypeForExtension(name.substring(index + 1));
	}
	}
	return type;
	}

	static PassOwnPtr<BlobData> createBlobDataForFileWithType(const String& path, const String& contentType)
	{
	OwnPtr<BlobData> blobData = BlobData::create();
	blobData->setContentType(contentType);
	blobData->appendFile(path);
	return blobData.release();
	}

	static PassOwnPtr<BlobData> createBlobDataForFile(const String& path, File::ContentTypeLookupPolicy policy)
	{
	return createBlobDataForFileWithType(path, getContentTypeFromFileName(path, policy));
	}

	static PassOwnPtr<BlobData> createBlobDataForFileWithName(const String& path, const String& fileSystemName, File::ContentTypeLookupPolicy policy)
	{
	return createBlobDataForFileWithType(path, getContentTypeFromFileName(fileSystemName, policy));
	}

	static PassOwnPtr<BlobData> createBlobDataForFileWithMetadata(const String& fileSystemName, const FileMetadata& metadata)
	{
	OwnPtr<BlobData> blobData = BlobData::create();
	blobData->setContentType(getContentTypeFromFileName(fileSystemName, File::WellKnownContentTypes));
	blobData->appendFile(metadata.platformPath, 0, metadata.length, metadata.modificationTime / msPerSecond);
	return blobData.release();
	}

	static PassOwnPtr<BlobData> createBlobDataForFileSystemURL(const KURL& fileSystemURL, const FileMetadata& metadata)
	{
	OwnPtr<BlobData> blobData = BlobData::create();
	blobData->setContentType(getContentTypeFromFileName(fileSystemURL.path(), File::WellKnownContentTypes));
	blobData->appendFileSystemURL(fileSystemURL, 0, metadata.length, metadata.modificationTime / msPerSecond);
	return blobData.release();
	}

	// static
	File* File::create(const HeapVector<BlobOrStringOrArrayBufferViewOrArrayBuffer>& fileBits, const String& fileName, const FilePropertyBag& options, ExceptionState& exceptionState)
	{
	ASSERT(options.hasType());
	if (!options.type().containsOnlyASCII()) {
	exceptionState.throwDOMException(SyntaxError, "The 'type' property must consist of ASCII characters.");
	return nullptr;
	}

	double lastModified;
	if (options.hasLastModified())
	lastModified = static_cast<double>(options.lastModified());
	else
	lastModified = currentTimeMS();
	ASSERT(options.hasEndings());
	bool normalizeLineEndingsToNative = options.endings() == "native";

	OwnPtr<BlobData> blobData = BlobData::create();
	blobData->setContentType(options.type().lower());
	populateBlobData(blobData.get(), fileBits, normalizeLineEndingsToNative);

	long long fileSize = blobData->length();
	return File::create(fileName, lastModified, BlobDataHandle::create(blobData.release(), fileSize));
	}

	File* File::createWithRelativePath(const String& path, const String& relativePath)
	{
	File* file = new File(path, File::AllContentTypes, File::IsUserVisible);
	file->m_relativePath = relativePath;
	return file;
	}

	File::File(const String& path, ContentTypeLookupPolicy policy, UserVisibility userVisibility)
	: Blob(BlobDataHandle::create(createBlobDataForFile(path, policy), -1))
	, m_hasBackingFile(true)
	, m_userVisibility(userVisibility)
	, m_path(path)
	, m_name(Platform::current()->fileUtilities()->baseName(path))
	, m_snapshotSize(-1)
	, m_snapshotModificationTimeMS(invalidFileTime())
	{
	}

	File::File(const String& path, const String& name, ContentTypeLookupPolicy policy, UserVisibility userVisibility)
	: Blob(BlobDataHandle::create(createBlobDataForFileWithName(path, name, policy), -1))
	, m_hasBackingFile(true)
	, m_userVisibility(userVisibility)
	, m_path(path)
	, m_name(name)
	, m_snapshotSize(-1)
	, m_snapshotModificationTimeMS(invalidFileTime())
	{
	}

	File::File(const String& path, const String& name, const String& relativePath, UserVisibility userVisibility, bool hasSnaphotData, uint64_t size, double lastModified, PassRefPtr<BlobDataHandle> blobDataHandle)
	: Blob(blobDataHandle)
	, m_hasBackingFile(!path.isEmpty() \|\| !relativePath.isEmpty())
	, m_userVisibility(userVisibility)
	, m_path(path)
	, m_name(name)
	, m_snapshotSize(hasSnaphotData ? static_cast<long long>(size) : -1)
	, m_snapshotModificationTimeMS(hasSnaphotData ? lastModified : invalidFileTime())
	, m_relativePath(relativePath)
	{
	}

	File::File(const String& name, double modificationTimeMS, PassRefPtr<BlobDataHandle> blobDataHandle)
	: Blob(blobDataHandle)
	, m_hasBackingFile(false)
	, m_userVisibility(File::IsNotUserVisible)
	, m_name(name)
	, m_snapshotSize(Blob::size())
	, m_snapshotModificationTimeMS(modificationTimeMS)
	{
	}

	File::File(const String& name, const FileMetadata& metadata, UserVisibility userVisibility)
	: Blob(BlobDataHandle::create(createBlobDataForFileWithMetadata(name, metadata), metadata.length))
	, m_hasBackingFile(true)
	, m_userVisibility(userVisibility)
	, m_path(metadata.platformPath)
	, m_name(name)
	, m_snapshotSize(metadata.length)
	, m_snapshotModificationTimeMS(metadata.modificationTime)
	{
	}

	File::File(const KURL& fileSystemURL, const FileMetadata& metadata, UserVisibility userVisibility)
	: Blob(BlobDataHandle::create(createBlobDataForFileSystemURL(fileSystemURL, metadata), metadata.length))
	, m_hasBackingFile(false)
	, m_userVisibility(userVisibility)
	, m_name(decodeURLEscapeSequences(fileSystemURL.lastPathComponent()))
	, m_fileSystemURL(fileSystemURL)
	, m_snapshotSize(metadata.length)
	, m_snapshotModificationTimeMS(metadata.modificationTime)
	{
	}

	File::File(const File& other)
	: Blob(other.blobDataHandle())
	, m_hasBackingFile(other.m_hasBackingFile)
	, m_userVisibility(other.m_userVisibility)
	, m_path(other.m_path)
	, m_name(other.m_name)
	, m_fileSystemURL(other.m_fileSystemURL)
	, m_snapshotSize(other.m_snapshotSize)
	, m_snapshotModificationTimeMS(other.m_snapshotModificationTimeMS)
	, m_relativePath(other.m_relativePath)
	{
	}

	File* File::clone(const String& name) const
	{
	File* file = new File(*this);
	if (!name.isNull())
	file->m_name = name;
	return file;
	}

	double File::lastModifiedMS() const
	{
	if (hasValidSnapshotMetadata() && isValidFileTime(m_snapshotModificationTimeMS))
	return m_snapshotModificationTimeMS;

	double modificationTimeMS;
	if (hasBackingFile() && getFileModificationTime(m_path, modificationTimeMS) && isValidFileTime(modificationTimeMS))
	return modificationTimeMS;

	return currentTimeMS();
	}

	long long File::lastModified() const
	{
	double modifiedDate = lastModifiedMS();

	// The getter should return the current time when the last modification time isn't known.
	if (!isValidFileTime(modifiedDate))
	modifiedDate = currentTimeMS();

	// lastModified returns a number, not a Date instance,
	// http://dev.w3.org/2006/webapi/FileAPI/#file-attrs
	return floor(modifiedDate);
	}

	double File::lastModifiedDate() const
	{
	double modifiedDate = lastModifiedMS();

	// The getter should return the current time when the last modification time isn't known.
	if (!isValidFileTime(modifiedDate))
	modifiedDate = currentTimeMS();

	// lastModifiedDate returns a Date instance,
	// http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate
	return modifiedDate;
	}

	unsigned long long File::size() const
	{
	if (hasValidSnapshotMetadata())
	return m_snapshotSize;

	// FIXME: JavaScript cannot represent sizes as large as unsigned long long, we need to
	// come up with an exception to throw if file size is not representable.
	long long size;
	if (!hasBackingFile() \|\| !getFileSize(m_path, size))
	return 0;
	return static_cast<unsigned long long>(size);
	}

	Blob* File::slice(long long start, long long end, const String& contentType, ExceptionState& exceptionState) const
	{
	if (hasBeenClosed()) {
	exceptionState.throwDOMException(InvalidStateError, "File has been closed.");
	return nullptr;
	}

	if (!m_hasBackingFile)
	return Blob::slice(start, end, contentType, exceptionState);

	// FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
	long long size;
	double modificationTimeMS;
	captureSnapshot(size, modificationTimeMS);
	clampSliceOffsets(size, start, end);

	long long length = end - start;
	OwnPtr<BlobData> blobData = BlobData::create();
	blobData->setContentType(contentType);
	if (!m_fileSystemURL.isEmpty()) {
	blobData->appendFileSystemURL(m_fileSystemURL, start, length, modificationTimeMS / msPerSecond);
	} else {
	ASSERT(!m_path.isEmpty());
	blobData->appendFile(m_path, start, length, modificationTimeMS / msPerSecond);
	}
	return Blob::create(BlobDataHandle::create(blobData.release(), length));
	}

	void File::captureSnapshot(long long& snapshotSize, double& snapshotModificationTimeMS) const
	{
	if (hasValidSnapshotMetadata()) {
	snapshotSize = m_snapshotSize;
	snapshotModificationTimeMS = m_snapshotModificationTimeMS;
	return;
	}

	// 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.
	// If we fail to retrieve the size or modification time, probably due to that the file has been deleted, 0 size is returned.
	FileMetadata metadata;
	if (!hasBackingFile() \|\| !getFileMetadata(m_path, metadata)) {
	snapshotSize = 0;
	snapshotModificationTimeMS = invalidFileTime();
	return;
	}

	snapshotSize = metadata.length;
	snapshotModificationTimeMS = metadata.modificationTime;
	}

	void File::close(ExecutionContext* executionContext, ExceptionState& exceptionState)
	{
	if (hasBeenClosed()) {
	exceptionState.throwDOMException(InvalidStateError, "Blob has been closed.");
	return;
	}

	// Reset the File to its closed representation, an empty
	// Blob. The name isn't cleared, as it should still be
	// available.
	m_hasBackingFile = false;
	m_path = String();
	m_fileSystemURL = KURL();
	invalidateSnapshotMetadata();
	m_relativePath = String();
	Blob::close(executionContext, exceptionState);
	}

	void File::appendTo(BlobData& blobData) const
	{
	if (!m_hasBackingFile) {
	Blob::appendTo(blobData);
	return;
	}

	// FIXME: This involves synchronous file operation. We need to figure out how to make it asynchronous.
	long long size;
	double modificationTimeMS;
	captureSnapshot(size, modificationTimeMS);
	if (!m_fileSystemURL.isEmpty()) {
	blobData.appendFileSystemURL(m_fileSystemURL, 0, size, modificationTimeMS / msPerSecond);
	return;
	}
	ASSERT(!m_path.isEmpty());
	blobData.appendFile(m_path, 0, size, modificationTimeMS / msPerSecond);
	}

	bool File::hasSameSource(const File& other) const
	{
	if (m_hasBackingFile != other.m_hasBackingFile)
	return false;

	if (m_hasBackingFile)
	return m_path == other.m_path;

	if (m_fileSystemURL.isEmpty() != other.m_fileSystemURL.isEmpty())
	return false;

	if (!m_fileSystemURL.isEmpty())
	return m_fileSystemURL == other.m_fileSystemURL;

	return uuid() == other.uuid();
	}

	} // namespace blink