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diff --git a/gpr/source/lib/dng_sdk/dng_memory_stream.h b/gpr/source/lib/dng_sdk/dng_memory_stream.h
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+++ b/gpr/source/lib/dng_sdk/dng_memory_stream.h
@@ -0,0 +1,97 @@
+/*****************************************************************************/
+// Copyright 2006-2007 Adobe Systems Incorporated
+// All Rights Reserved.
+//
+// NOTICE:  Adobe permits you to use, modify, and distribute this file in
+// accordance with the terms of the Adobe license agreement accompanying it.
+/*****************************************************************************/
+
+/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_memory_stream.h#2 $ */ 
+/* $DateTime: 2012/07/31 22:04:34 $ */
+/* $Change: 840853 $ */
+/* $Author: tknoll $ */
+
+/** \file
+ * Stream abstraction to/from in-memory data.
+ */
+
+/*****************************************************************************/
+
+#ifndef __dng_memory_stream__
+#define __dng_memory_stream__
+
+/*****************************************************************************/
+
+#include "dng_stream.h"
+
+/*****************************************************************************/
+
+/// \brief A dng_stream which can be read from or written to memory.
+///
+/// Stream is populated via writing and either read or accessed by asking for contents as a pointer.
+
+class dng_memory_stream: public dng_stream
+	{
+	
+	protected:
+	
+		dng_memory_allocator &fAllocator;
+		
+		uint32 fPageSize;
+		
+		uint32 fPageCount;
+		uint32 fPagesAllocated;
+		
+		dng_memory_block **fPageList;
+		
+		uint64 fMemoryStreamLength;
+		
+	public:
+
+		/// Construct a new memory-based stream.
+		/// \param allocator Allocator to use to allocate memory in stream as needed.
+		/// \param sniffer If non-NULL used to check for user cancellation.
+		/// \param pageSize Unit of allocation for data stored in stream.
+
+		dng_memory_stream (dng_memory_allocator &allocator,
+						   dng_abort_sniffer *sniffer = NULL,
+						   uint32 pageSize = 64 * 1024);
+						   
+		virtual ~dng_memory_stream ();
+
+		/// Copy a specified number of bytes to a target stream.
+		/// \param dstStream The target stream.
+		/// \param count The number of bytes to copy.
+		
+		virtual void CopyToStream (dng_stream &dstStream,
+								   uint64 count);
+		
+	protected:
+		
+		virtual uint64 DoGetLength ();
+	
+		virtual void DoRead (void *data,
+							 uint32 count,
+							 uint64 offset);
+							 
+		virtual void DoSetLength (uint64 length);
+							 
+		virtual void DoWrite (const void *data,
+							  uint32 count,
+							  uint64 offset);
+		
+	private:
+	
+		// Hidden copy constructor and assignment operator.
+	
+		dng_memory_stream (const dng_memory_stream &stream);
+		
+		dng_memory_stream & operator= (const dng_memory_stream &stream);
+		
+	};
+
+/*****************************************************************************/
+
+#endif
+	
+/*****************************************************************************/