1 files changed, 68 insertions, 0 deletions
diff --git a/indra/llcommon/llcrc.h b/indra/llcommon/llcrc.h
new file mode 100644
index 0000000000..2d291d92a1
--- /dev/null
+++ b/indra/llcommon/llcrc.h
@@ -0,0 +1,68 @@
+/** 
+ * @file llcrc.h
+ * @brief LLCRC class header file.
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#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 LL_COMMON_API LLCRC
+{
+protected:
+	U32 mCurrent;
+	
+public:
+	LLCRC();
+
+	U32 getCRC() const;
+	void update(U8 next_byte);
+	void update(const U8* buffer, size_t buffer_size);
+	void update(const std::string& 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