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