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diff --git a/indra/llcommon/llendianswizzle.h b/indra/llcommon/llendianswizzle.h
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+++ b/indra/llcommon/llendianswizzle.h
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+/** 
+ * @file llendianswizzle.h
+ * @brief Functions for in-place bit swizzling
+ *
+ * Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLENDIANSWIZZLE_H
+#define LL_LLENDIANSWIZZLE_H
+
+/* This function is intended to be used for in-place swizzling, particularly after fread() of
+	binary values from a file.  Such as:
+	
+	numRead = fread(scale.mV, sizeof(float), 3, fp);
+	llendianswizzle(scale.mV, sizeof(float), 3);
+	
+	It assumes that the values in the file are LITTLE endian, so it's a no-op on a little endian machine.
+	
+	It keys off of typesize to do the correct swizzle, so make sure that typesize is the size of the native type.
+	
+	64-bit types are not yet handled.
+*/
+
+#ifdef LL_LITTLE_ENDIAN
+	// little endian is native for most things.
+	inline void llendianswizzle(void *,int,int)
+	{
+		// Nothing to do
+	}
+#endif
+
+#ifdef LL_BIG_ENDIAN
+	// big endian requires a bit of work.
+	inline void llendianswizzle(void *p,int typesize, int count)
+	{
+		int i;
+		switch(typesize)
+		{
+			case 2:
+			{
+				U16 temp;
+				for(i=count ;i!=0 ;i--)
+				{
+					temp = ((U16*)p)[0];
+					((U16*)p)[0] = 	((temp >> 8)  & 0x000000FF) | ((temp << 8)  & 0x0000FF00);
+					p = (void*)(((U16*)p) + 1);
+				}
+			}
+			break;
+			
+			case 4:
+			{
+				U32 temp;
+				for(i=count; i!=0; i--)
+				{
+					temp = ((U32*)p)[0];
+					((U32*)p)[0] = 	
+							((temp >> 24) & 0x000000FF) | 
+							((temp >> 8)  & 0x0000FF00) | 
+							((temp << 8)  & 0x00FF0000) |
+							((temp << 24) & 0xFF000000);
+					p = (void*)(((U32*)p) + 1);
+				}
+			}
+			break;
+		}
+		
+	}
+#endif
+
+// Use this when working with a single integral value you want swizzled
+
+#define llendianswizzleone(x) llendianswizzle(&(x), sizeof(x), 1)
+
+#endif // LL_LLENDIANSWIZZLE_H