open source

2020-11-11 16:17:13 +08:00
parent 4d989f3ecb
commit bc4ca748de
2441 changed files with 623057 additions and 2 deletions
@@ -0,0 +1,52 @@
+/**
+@file			JCSimpleCRC.h
+@brief			
+@author			hugao
+@version		1.0
+@date			2016_5_12
+*/
+
+#ifndef __JCSimpleCRC_H__
+#define __JCSimpleCRC_H__
+
+
+class JCSimpleCRC
+{
+private:
+	long long m_i64Key;
+public:
+    JCSimpleCRC()
+	{
+		m_i64Key = 0;
+	}
+	void process_bytes( const void *p_pBuffer, size_t p_iSize )
+	{
+		long long *pBuf64=(long long *)p_pBuffer;
+		for(size_t i=0,isz=p_iSize/8; i<isz; i++,pBuf64++)
+		{
+			m_i64Key ^= *pBuf64;
+		}
+		for(size_t i=p_iSize/8*8; i<p_iSize; i++)
+		{
+			m_i64Key ^= ((const unsigned char *)p_pBuffer)[i];
+		}
+	}
+	void reset()
+	{
+		m_i64Key = 0;
+	}
+	unsigned int checksum()
+	{
+		unsigned int lRet = 0;
+		unsigned int *p = (unsigned int *)&m_i64Key;
+		lRet ^= *p;
+		lRet ^= *(p+1);
+		return lRet;
+	}
+};
+//------------------------------------------------------------------------------
+
+
+#endif //__JCSimpleCRC_H__
+
+//-----------------------------END FILE--------------------------------