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diff --git a/indra/llcommon/llmemorystream.h b/indra/llcommon/llmemorystream.h
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+/** 
+ * @file llmemorystream.h
+ * @author Phoenix
+ * @date 2005-06-03
+ * @brief Implementation of a simple fixed memory stream
+ *
+ * Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#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