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thirdparty/raknet/Source/CheckSum.cpp

@@ -0,0 +1,97 @@
+/**
+* @file 
+* @brief CheckSum implementation from http://www.flounder.com/checksum.htm
+* 
+*/
+#include "CheckSum.h"
+
+/****************************************************************************
+*        CheckSum::add
+* Inputs:
+*   unsigned int d: word to add
+* Result: void
+* 
+* Effect: 
+*   Adds the bytes of the unsigned int to the CheckSum
+****************************************************************************/
+
+void CheckSum::Add ( unsigned int value )
+{
+	union
+	{
+		unsigned int value;
+		unsigned char bytes[ 4 ];
+	}
+
+	data;
+	data.value = value;
+
+	for ( unsigned int i = 0; i < sizeof( data.bytes ); i++ )
+		Add ( data.bytes[ i ] )
+
+		;
+} // CheckSum::add(unsigned int)
+
+/****************************************************************************
+*       CheckSum::add
+* Inputs:
+*   unsigned short value:
+* Result: void
+* 
+* Effect: 
+*   Adds the bytes of the unsigned short value to the CheckSum
+****************************************************************************/
+
+void CheckSum::Add ( unsigned short value )
+{
+	union
+	{
+		unsigned short value;
+		unsigned char bytes[ 2 ];
+	}
+
+	data;
+	data.value = value;
+
+	for ( unsigned int i = 0; i < sizeof( data.bytes ); i++ )
+		Add ( data.bytes[ i ] )
+
+		;
+} // CheckSum::add(unsigned short)
+
+/****************************************************************************
+*       CheckSum::add
+* Inputs:
+*   unsigned char value:
+* Result: void
+* 
+* Effect: 
+*   Adds the byte to the CheckSum
+****************************************************************************/
+
+void CheckSum::Add ( unsigned char value )
+{
+	unsigned char cipher = (unsigned char)( value ^ ( r >> 8 ) );
+	r = ( cipher + r ) * c1 + c2;
+	sum += cipher;
+} // CheckSum::add(unsigned char)
+
+
+/****************************************************************************
+*       CheckSum::add
+* Inputs:
+*   LPunsigned char b: pointer to byte array
+*   unsigned int length: count
+* Result: void
+* 
+* Effect: 
+*   Adds the bytes to the CheckSum
+****************************************************************************/
+
+void CheckSum::Add ( unsigned char *b, unsigned int length )
+{
+	for ( unsigned int i = 0; i < length; i++ )
+		Add ( b[ i ] )
+
+		;
+} // CheckSum::add(LPunsigned char, unsigned int)