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diff --git a/Source/WebCore/fileapi/DOMFileSystem.cpp b/Source/WebCore/fileapi/DOMFileSystem.cpp
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+++ b/Source/WebCore/fileapi/DOMFileSystem.cpp
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+/*
+ * Copyright (C) 2010 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 "config.h"
+#include "DOMFileSystem.h"
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "AsyncFileSystem.h"
+#include "DOMFilePath.h"
+#include "DirectoryEntry.h"
+#include "ErrorCallback.h"
+#include "File.h"
+#include "FileEntry.h"
+#include "FileSystemCallbacks.h"
+#include "FileWriter.h"
+#include "FileWriterBaseCallback.h"
+#include "FileWriterCallback.h"
+#include "MetadataCallback.h"
+#include "ScriptExecutionContext.h"
+#include <wtf/OwnPtr.h>
+
+namespace WebCore {
+
+DOMFileSystem::DOMFileSystem(ScriptExecutionContext* context, const String& name, PassOwnPtr<AsyncFileSystem> asyncFileSystem)
+    : DOMFileSystemBase(name, asyncFileSystem)
+    , ActiveDOMObject(context, this)
+{
+}
+
+PassRefPtr<DirectoryEntry> DOMFileSystem::root()
+{
+    return DirectoryEntry::create(this, DOMFilePath::root);
+}
+
+void DOMFileSystem::stop()
+{
+    m_asyncFileSystem->stop();
+}
+
+bool DOMFileSystem::hasPendingActivity() const
+{
+    return m_asyncFileSystem->hasPendingActivity();
+}
+
+void DOMFileSystem::contextDestroyed()
+{
+    m_asyncFileSystem->stop();
+    ActiveDOMObject::contextDestroyed();
+}
+
+namespace {
+
+class ConvertToFileWriterCallback : public FileWriterBaseCallback {
+public:
+    static PassRefPtr<ConvertToFileWriterCallback> create(PassRefPtr<FileWriterCallback> callback)
+    {
+        return adoptRef(new ConvertToFileWriterCallback(callback));
+    }
+
+    bool handleEvent(FileWriterBase* fileWriterBase)
+    {
+        return m_callback->handleEvent(static_cast<FileWriter*>(fileWriterBase));
+    }
+private:
+    ConvertToFileWriterCallback(PassRefPtr<FileWriterCallback> callback)
+        : m_callback(callback)
+    {
+    }
+    RefPtr<FileWriterCallback> m_callback;
+};
+
+}
+
+void DOMFileSystem::createWriter(const FileEntry* fileEntry, PassRefPtr<FileWriterCallback> successCallback, PassRefPtr<ErrorCallback> errorCallback)
+{
+    ASSERT(fileEntry);
+
+    String platformPath = m_asyncFileSystem->virtualToPlatformPath(fileEntry->fullPath());
+
+    RefPtr<FileWriter> fileWriter = FileWriter::create(scriptExecutionContext());
+    RefPtr<FileWriterBaseCallback> conversionCallback = ConvertToFileWriterCallback::create(successCallback);
+    OwnPtr<FileWriterBaseCallbacks> callbacks = FileWriterBaseCallbacks::create(fileWriter, conversionCallback, errorCallback);
+    m_asyncFileSystem->createWriter(fileWriter.get(), platformPath, callbacks.release());
+}
+
+void DOMFileSystem::createFile(const FileEntry* fileEntry, PassRefPtr<FileCallback> successCallback, PassRefPtr<ErrorCallback>)
+{
+    String platformPath = m_asyncFileSystem->virtualToPlatformPath(fileEntry->fullPath());
+    scheduleCallback(successCallback, File::create(platformPath));
+}
+
+} // namespace
+
+#endif // ENABLE(FILE_SYSTEM)