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diff --git a/linden/indra/llmath/llcrc.h b/linden/indra/llmath/llcrc.h
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+/** 
+ * @file llcrc.h
+ * @brief LLCRC class header file.
+ *
+ * Copyright (c) 2002-2007, 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_LLCRC_H
+#define LL_LLCRC_H
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class llcrc
+//
+// Simple 32 bit crc. To use, instantiate an LLCRC instance and feed
+// it the bytes you want to check. It will update the internal crc as
+// you go, and you can qery it at the end. As a horribly inefficient
+// example (don't try this at work kids):
+//
+//  LLCRC crc;
+//  FILE* fp = LLFile::fopen(filename,"rb");
+//  while(!feof(fp)) {
+//    crc.update(fgetc(fp));
+//  }
+//  fclose(fp);
+//  llinfos << "File crc: " << crc.getCRC() << llendl;
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLCRC
+{
+protected:
+        U32 mCurrent;
+        
+public:
+        LLCRC();
+
+        U32 getCRC() const;
+        void update(U8 next_byte);
+        void update(const U8* buffer, U32 buffer_size);
+        void update(const char *filename);
+
+#ifdef _DEBUG
+        // This function runs tests to make sure the crc is
+        // working. Returns TRUE if it is.
+        static BOOL testHarness();
+#endif
+};
+
+
+#endif // LL_LLCRC_H