一个哈希码计算类

来源：互联网发布：返利机器人软件多少钱编辑：程序博客网时间：2024/04/29 17:19

#ifndef ___GHASH_H___
#define ___GHASH_H___

class CGHash
{
public:
CGHash();
virtual ~CGHash();

void Init();
void Update(const unsigned char *pData, unsigned long uSize);
void FinalToStr(char *strOutput, int nHash);

private:
unsigned long m_hash3;
unsigned long m_hash5;
};

#endif // ___GHASH_H___

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "ghash.h"

CGHash::CGHash()
{
Init();
}

CGHash::~CGHash()
{
Init();
}

void CGHash::Init()
{
m_hash3 = 0;
m_hash5 = 0;
}

void CGHash::Update(const unsigned char *pData, unsigned long uSize)
{
unsigned long i = 0;

for(i = 0; i < uSize; i++)
{
m_hash3 = (m_hash3 << 3) + m_hash3 + pData[i];
m_hash5 = (m_hash5 << 5) + m_hash5 + pData[i];
}
}

void CGHash::FinalToStr(char *strOutput, int nHash)
{
// Do NOT destroy internal hash states here!

if(nHash == 3)
{
  sprintf(strOutput, "%02X%02X%02X%02X",
   (m_hash3 & 0xFF000000) >> 24,
   (m_hash3 & 0x00FF0000) >> 16,
   (m_hash3 & 0x0000FF00) >> 8,
    m_hash3 & 0x000000FF);
}

if(nHash == 5)
{
  sprintf(strOutput, "%02X%02X%02X%02X",
   (m_hash5 & 0xFF000000) >> 24,
   (m_hash5 & 0x00FF0000) >> 16,
   (m_hash5 & 0x0000FF00) >> 8,
    m_hash5 & 0x000000FF);
}
}