diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/FileStreamProxy.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/FileStreamProxy.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2010 Google Inc.  All rights reserved.
+ * Copyright (C) 2010 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:
+ *
+ *     * 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.
+ */
+
+#ifndef FileStreamProxy_h
+#define FileStreamProxy_h
+
+#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
+
+#include "FileStreamClient.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class Blob;
+class FileStream;
+class FileThread;
+class ScriptExecutionContext;
+class String;
+
+// A proxy module that calls corresponding FileStream methods on the file thread.  Note: you must call stop() first and then release the reference to destruct the FileStreamProxy instance.
+class FileStreamProxy : public RefCounted<FileStreamProxy>, public FileStreamClient {
+public:
+    static PassRefPtr<FileStreamProxy> create(ScriptExecutionContext*, FileStreamClient*);
+    virtual ~FileStreamProxy();
+
+    void openForRead(Blob* blob);
+    void openForWrite(const String& path);
+    void close();
+    void read(char* buffer, int length);
+    void write(Blob* blob, long long position, int length);
+    void truncate(long long position);
+
+    // Stops the proxy and scedules it to be destructed.  All the pending tasks will be aborted and the file stream will be closed.
+    // Note: the caller should deref the instance immediately after calling stop().
+    void stop();
+
+    FileStreamClient* client() const { return m_client; }
+
+private:
+    FileStreamProxy(ScriptExecutionContext*, FileStreamClient*);
+
+    // FileStreamClient methods.
+    virtual void didGetSize(long long);
+    virtual void didRead(const char*, int);
+    virtual void didWrite(int);
+    virtual void didFinish();
+    virtual void didFail(ExceptionCode);
+    virtual void didStart();
+    virtual void didStop();
+
+    FileThread* fileThread();
+
+    RefPtr<ScriptExecutionContext> m_context;
+    FileStreamClient* m_client;
+    RefPtr<FileStream> m_stream;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
+
+#endif // FileStreamProxy_h