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include/raknet/CheckSum.hpp

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+/*
+ *  Copyright (c) 2014, Oculus VR, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant 
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+///
+/// \file CheckSum.cpp
+/// \brief [Internal] CheckSum implementation from http://www.flounder.com/checksum.htm
+///
+
+#ifndef __CHECKSUM_H
+#define __CHECKSUM_H
+
+#include "RakMemoryOverride.hpp"
+
+/// Generates and validates checksums
+class CheckSum
+{
+
+public:
+	
+ /// Default constructor
+	
+	CheckSum()
+	{
+		Clear();
+	}
+	
+	void Clear()
+	{
+		sum = 0;
+		r = 55665;
+		c1 = 52845;
+		c2 = 22719;
+	}
+	
+	void Add ( unsigned int w );
+	
+	
+	void Add ( unsigned short w );
+	
+	void Add ( unsigned char* b, unsigned int length );
+	
+	void Add ( unsigned char b );
+	
+	unsigned int Get ()
+	{
+		return sum;
+	}
+	
+protected:
+	unsigned short r;
+	unsigned short c1;
+	unsigned short c2;
+	unsigned int sum;
+};
+
+#endif