crc_fw.cpp

是我自己写的32位crc算法

#include <stdio.h>
/*计算所得数据存放数组*/
unsigned long int crc32_table[256];
/*profisafe中的数组*/
unsigned long int crc32_table_old[256]={
	    0x00000000,0xF4ACFB13,0x1DF50D35,0xE959F626,0x3BEA1A6A,0xCF46E179,0x261F175F,0xD2B3EC4C,
		0x77D434D4,0x8378CFC7,0x6A2139E1,0x9E8DC2F2,0x4C3E2EBE,0xB892D5AD,0x51CB238B,0xA567D898,
		
		0xEFA869A8,0x1B0492BB,0xF25D649D,0x06F19F8E,0xD44273C2,0x20EE88D1,0xC9B77EF7,0x3D1B85E4,
		0x987C5D7C,0x6CD0A66F,0x85895049,0x7125AB5A,0xA3964716,0x573ABC05,0xBE634A23,0x4ACFB130,
		0x2BFC2843,0xDF50D350,0x36092576,0xC2A5DE65,0x10163229,0xE4BAC93A,0x0DE33F1C,0xF94FC40F,
		0x5C281C97,0xA884E784,0x41DD11A2,0xB571EAB1,0x67C206FD,0x936EFDEE,0x7A370BC8,0x8E9BF0DB,
		0xC45441EB,0x30F8BAF8,0xD9A14CDE,0x2D0DB7CD,0xFFBE5B81,0x0B12A092,0xE24B56B4,0x16E7ADA7,
		0xB380753F,0x472C8E2C,0xAE75780A,0x5AD98319,0x886A6F55,0x7CC69446,0x959F6260,0x61339973,
		0x57F85086,0xA354AB95,0x4A0D5DB3,0xBEA1A6A0,0x6C124AEC,0x98BEB1FF,0x71E747D9,0x854BBCCA,
		0x202C6452,0xD4809F41,0x3DD96967,0xC9759274,0x1BC67E38,0xEF6A852B,0x0633730D,0xF29F881E,
		0xB850392E,0x4CFCC23D,0xA5A5341B,0x5109CF08,0x83BA2344,0x7716D857,0x9E4F2E71,0x6AE3D562,
		0xCF840DFA,0x3B28F6E9,0xD27100CF,0x26DDFBDC,0xF46E1790,0x00C2EC83,0xE99B1AA5,0x1D37E1B6,
		
		0x7C0478C5,0x88A883D6,0x61F175F0,0x955D8EE3,0x47EE62AF,0xB34299BC,0x5A1B6F9A,0xAEB79489,
		0x0BD04C11,0xFF7CB702,0x16254124,0xE289BA37,0x303A567B,0xC496AD68,0x2DCF5B4E,0xD963A05D,
		0x93AC116D,0x6700EA7E,0x8E591C58,0x7AF5E74B,0xA8460B07,0x5CEAF014,0xB5B30632,0x411FFD21,
		0xE47825B9,0x10D4DEAA,0xF98D288C,0x0D21D39F,0xDF923FD3,0x2B3EC4C0,0xC26732E6,0x36CBC9F5,
		0xAFF0A10C,0x5B5C5A1F,0xB205AC39,0x46A9572A,0x941ABB66,0x60B64075,0x89EFB653,0x7D434D40,
		0xD82495D8,0x2C886ECB,0xC5D198ED,0x317D63FE,0xE3CE8FB2,0x176274A1,0xFE3B8287,0x0A977994,
		0x4058C8A4,0xB4F433B7,0x5DADC591,0xA9013E82,0x7BB2D2CE,0x8F1E29DD,0x6647DFFB,0x92EB24E8,
		0x378CFC70,0xC3200763,0x2A79F145,0xDED50A56,0x0C66E61A,0xF8CA1D09,0x1193EB2F,0xE53F103C,
		0x840C894F,0x70A0725C,0x99F9847A,0x6D557F69,0xBFE69325,0x4B4A6836,0xA2139E10,0x56BF6503,
		0xF3D8BD9B,0x07744688,0xEE2DB0AE,0x1A814BBD,0xC832A7F1,0x3C9E5CE2,0xD5C7AAC4,0x216B51D7,
		
		0x6BA4E0E7,0x9F081BF4,0x7651EDD2,0x82FD16C1,0x504EFA8D,0xA4E2019E,0x4DBBF7B8,0xB9170CAB,
		0x1C70D433,0xE8DC2F20,0x0185D906,0xF5292215,0x279ACE59,0xD336354A,0x3A6FC36C,0xCEC3387F,
		0xF808F18A,0x0CA40A99,0xE5FDFCBF,0x115107AC,0xC3E2EBE0,0x374E10F3,0xDE17E6D5,0x2ABB1DC6,
		0x8FDCC55E,0x7B703E4D,0x9229C86B,0x66853378,0xB436DF34,0x409A2427,0xA9C3D201,0x5D6F2912,
		0x17A09822,0xE30C6331,0x0A559517,0xFEF96E04,0x2C4A8248,0xD8E6795B,0x31BF8F7D,0xC513746E,
		0x6074ACF6,0x94D857E5,0x7D81A1C3,0x892D5AD0,0x5B9EB69C,0xAF324D8F,0x466BBBA9,0xB2C740BA,
		0xD3F4D9C9,0x275822DA,0xCE01D4FC,0x3AAD2FEF,0xE81EC3A3,0x1CB238B0,0xF5EBCE96,0x01473585,
		0xA420ED1D,0x508C160E,0xB9D5E028,0x4D791B3B,0x9FCAF777,0x6B660C64,0x823FFA42,0x76930151,
		0x3C5CB061,0xC8F04B72,0x21A9BD54,0xD5054647,0x07B6AA0B,0xF31A5118,0x1A43A73E,0xEEEF5C2D,
		0x4B8884B5,0xBF247FA6,0x567D8980,0xA2D17293,0x70629EDF,0x84CE65CC,0x6D9793EA,0x993B68F9};
	/*生成多项式十六进制数据表示（不含另外加的1）*/
	unsigned long int ulPolynomial = 0xF4ACFB13;
	
	/*计算法获得crc32码*/
	unsigned long CRC32_jsf(unsigned   long   int c)   
	{ 
		unsigned   long   int   crc,temp; 
		crc=0;
        temp=0;
		
		for(unsigned   long   int   i   =   0;   i   <=   c;   i++)   
		{  
			temp= temp^(i<<24);
			
			for   (int   j   =   0;   j   <   8;   j++)
			{   
				unsigned   long   int   t1,t2;   
				unsigned   long   int   flag=temp&0x80000000;   
				t1=(temp<<1);   
				if(flag==0)   
					t2=0;   
				else   
					t2=ulPolynomial;   
				temp   =t1^t2   ;	
			} 
			
			crc=temp; 
		} 
		return crc;
	} 
	
    /*查表法获得crc32码*/
unsigned	char data[300]={0};
	unsigned long CRC32_cbf(unsigned long  len)
	{
		unsigned long oldcrc32;
		unsigned long crc32;
		unsigned long oldcrc;
		unsigned  int charcnt;
       unsigned char c,t;
		oldcrc32 = 0x00010203; //初值为0
		charcnt=0;
		for(unsigned long k=0;k<=len;k++)
		{
			data[k]=k;
		}
		
		for( charcnt=0;charcnt<=len;charcnt++)
		{
		
			t= (oldcrc32 >> 24)&0xFF;   //要移出的字节的值
			oldcrc=crc32_table_old[t];         //根据移出的字节的值查表
			c=data[charcnt+4];          //新移进来的字节值
			oldcrc32= (oldcrc32 << 8) | c;   //将新移进来的字节值添在寄存器末字节中
			oldcrc32=oldcrc32^oldcrc;     //将寄存器与查出的值进行xor运算
		}
		
		
        crc32=oldcrc32;
        return crc32;
	}
	
	
	/*主函数用于比对profisafe中的crc32数据是否有误，另外计算0~255（256字节的数据）的crc32码*/	
	void main()
	{ 
		for(int i = 0; i <= 0xFF; i++)//i表示crc要验证的数据（0~255）
		{   
            crc32_table[i]= i<< 24;  //由于i是32位，把后8位移至最前面。
			
			for (int j = 0; j < 8; j++)
			{
				unsigned long int t1,t2;
				unsigned long int flag=crc32_table[i]&0x80000000;//验证32位中的最高位是否为1
				t1=(crc32_table[i] << 1);//将数据向左移一位，结果记入t1
				if(flag==0)
					t2=0;//如果32位中的最高位为1，与t1异或的为0
				else
					//如果32位中的最高位为1，与t1异或的为16进制生成多项式数据表达式，相当于作除运算
					t2=ulPolynomial;
				crc32_table[i] =t1^t2 ; 
			} //循环结束时，crc32_table[i]的值即为数据i的crc32码
			
			
			int result=0;
			
			//比对计算所的crc32_table[i]和profisafe中的crc32数据是否一致
			if(crc32_table[i]==crc32_table_old[i])
			{
				result=1;
			}
	//	printf("0%XH,",crc32_table[i]);//crc32_table[i]结果
			// printf("%X",crc32_table_old[i]);//crc32_table_old[i]结果
			printf("i=%d  crc32[%d]=%X  crc32_old[%d]=%X   result=%d\n",i,i,crc32_table[i],i,crc32_table_old[i],result); 
		}
		unsigned long crc_256_jsf,crc_256_cbf ;
		crc_256_jsf= CRC32_jsf(255);
        crc_256_cbf= CRC32_cbf(255);
		int result=0;
		if(crc_256_cbf==crc_256_jsf)
		{
			result=1;
		}
		printf("      crc_256_jsf=%X     crc_256_cbf=%X   result=%d\n",crc_256_jsf,crc_256_cbf,result);
		
		
	}