1 files changed, 44 insertions, 0 deletions
diff --git a/chrome_frame/stream_impl.h b/chrome_frame/stream_impl.h
new file mode 100644
index 0000000..9cced3e
--- /dev/null
+++ b/chrome_frame/stream_impl.h
@@ -0,0 +1,44 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_FRAME_STREAM_IMPL_H_
+#define CHROME_FRAME_STREAM_IMPL_H_
+
+#include <atlbase.h>
+#include <atlcom.h>
+
+#include "base/scoped_comptr_win.h"
+
+// A generic base class for IStream implementation. If provided
+// with a delegate, it delegated calls to it otherwise can be
+// used a as a base class for an IStream implementation.
+class StreamImpl : public IStream {
+ public:
+  StreamImpl() {}
+
+  void Initialize(IStream* delegate);
+
+  STDMETHOD(Write)(const void * buffer, ULONG size, ULONG* size_written);
+  STDMETHOD(Read)(void* pv, ULONG cb, ULONG* read);
+  STDMETHOD(Seek)(LARGE_INTEGER move, DWORD origin, ULARGE_INTEGER* new_pos);
+  STDMETHOD(SetSize)(ULARGE_INTEGER new_size);
+  STDMETHOD(CopyTo)(IStream* stream, ULARGE_INTEGER cb, ULARGE_INTEGER* read,
+                    ULARGE_INTEGER* written);
+  STDMETHOD(Commit)(DWORD flags);
+  STDMETHOD(Revert)();
+  STDMETHOD(LockRegion)(ULARGE_INTEGER offset, ULARGE_INTEGER cb,
+                        DWORD type);
+  STDMETHOD(UnlockRegion)(ULARGE_INTEGER offset, ULARGE_INTEGER cb,
+                          DWORD type);
+  STDMETHOD(Stat)(STATSTG* statstg, DWORD flag);
+  STDMETHOD(Clone)(IStream** stream);
+
+ protected:
+  ScopedComPtr<IStream> delegate_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(StreamImpl);
+};
+
+#endif  // CHROME_FRAME_STREAM_IMPL_H_