lvfulong
52 lines
913 B
C++
52 lines
913 B
C++
/**
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@file JCSimpleCRC.h
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@brief
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@author hugao
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@version 1.0
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@date 2016_5_12
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*/
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#ifndef __JCSimpleCRC_H__
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#define __JCSimpleCRC_H__
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class JCSimpleCRC
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{
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private:
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long long m_i64Key;
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public:
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JCSimpleCRC()
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{
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m_i64Key = 0;
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}
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void process_bytes( const void *p_pBuffer, size_t p_iSize )
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{
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long long *pBuf64=(long long *)p_pBuffer;
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for(size_t i=0,isz=p_iSize/8; i<isz; i++,pBuf64++)
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{
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m_i64Key ^= *pBuf64;
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}
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for(size_t i=p_iSize/8*8; i<p_iSize; i++)
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{
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m_i64Key ^= ((const unsigned char *)p_pBuffer)[i];
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}
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}
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void reset()
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{
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m_i64Key = 0;
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}
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unsigned int checksum()
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{
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unsigned int lRet = 0;
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unsigned int *p = (unsigned int *)&m_i64Key;
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lRet ^= *p;
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lRet ^= *(p+1);
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return lRet;
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}
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};
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//------------------------------------------------------------------------------
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#endif //__JCSimpleCRC_H__
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//-----------------------------END FILE--------------------------------
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