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+/** 
+ * @file llmemorystream.h
+ * @author Phoenix
+ * @date 2005-06-03
+ * @brief Implementation of a simple fixed memory stream
+ *
+ * Copyright (c) 2005-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLMEMORYSTREAM_H
+#define LL_LLMEMORYSTREAM_H
+
+/** 
+ * This is a simple but effective optimization when you want to treat
+ * a chunk of memory as an istream. I wrote this to avoid turing a
+ * buffer into a string, and then throwing the string into an
+ * iostringstream just to parse it into another datatype, eg, LLSD.
+ */
+
+#include <iostream>
+
+/** 
+ * @class LLMemoryStreamBuf
+ * @brief This implements a wrapper around a piece of memory for istreams
+ *
+ * The memory passed in is NOT owned by an instance. The caller must
+ * be careful to always pass in a valid memory location that exists
+ * for at least as long as this streambuf.
+ */
+class LLMemoryStreamBuf : public std::streambuf
+{
+public:
+        LLMemoryStreamBuf(const U8* start, S32 length);
+        ~LLMemoryStreamBuf();
+
+        void reset(const U8* start, S32 length);
+
+protected:
+        int underflow();
+        //std::streamsize xsgetn(char* dest, std::streamsize n);
+};
+
+
+/** 
+ * @class LLMemoryStream
+ * @brief This implements a wrapper around a piece of memory for istreams
+ *
+ * The memory passed in is NOT owned by an instance. The caller must
+ * be careful to always pass in a valid memory location that exists
+ * for at least as long as this streambuf.
+ */
+class LLMemoryStream : public std::istream
+{
+public:
+        LLMemoryStream(const U8* start, S32 length);
+        ~LLMemoryStream();
+
+protected:
+        LLMemoryStreamBuf mStreamBuf;
+};
+
+#endif // LL_LLMEMORYSTREAM_H