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  • 正文
    • 一、前言
    • 二、代碼示例
    • 三、結(jié)束語
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常用CRC校驗計算代碼示例

11/22 08:33
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一、前言

CRC是常用的數(shù)據(jù)校驗的方式之一，如果你們在項目中正好需要用到crc校驗的話沒必要自己浪費(fèi)時間去寫，可以直接到這里拷貝代碼片段快速加入到自己的程序里面。
關(guān)于crc校驗的原理我就不說了，感興趣的同學(xué)可以去原文看一下，我這里只貼上代碼片段。

二、代碼示例

CRC4

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
/****************************Info********************************************** 
 * Name:    CRC-4/ITU	x4+x+1 
 * Width:	4
 * Poly:    0x03 
 * Init:    0x00 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
unsigned char CRC4_ITU(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x03;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly << 4);
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin);
}

CRC5

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
/****************************Info********************************************** 
 * Name:    CRC-5/EPC	x5+x3+1 
 * Width:	5
 * Poly:    0x09 
 * Init:    0x09 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
unsigned char CRC5_EPC(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x09<<3;
	unsigned char wCPoly = 0x09<<3;
	
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly);
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin >> 3);
}
/****************************Info********************************************** 
 * Name:    CRC-5/USB	x5+x2+1 
 * Width:	5
 * Poly:    0x05 
 * Init:    0x1F 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x1F 
 * Note: 
 *****************************************************************************/
#if 0
unsigned char CRC5_USB(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x1F<<3;
	unsigned char wCPoly = 0x05;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly << 3);
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin^0x1F);
}
#else
unsigned char CRC5_USB(unsigned char *data, unsigned int datalen)  
{  
	unsigned char wCRCin = 0x1F;
	unsigned char wCPoly = 0x05;
	
	InvertUint8(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ (wCPoly >> 3);
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin^0x1F); 
} 
#endif
/****************************Info********************************************** 
 * Name:    CRC-5/ITU	x5+x4+x2+1  
 * Width:	5
 * Poly:    0x15 
 * Init:    0x00 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
 #if 0
unsigned char CRC5_ITU(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x15;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly << 3);
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else
unsigned char CRC5_ITU(unsigned char *data, unsigned int datalen)  
{  
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x15;
	
	InvertUint8(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ (wCPoly >> 3);
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin); 
} 
#endif

CRC6

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
/****************************Info********************************************** 
 * Name:    CRC-6/ITU	x6+x+1 
 * Width:	6
 * Poly:    0x03 
 * Init:    0x00 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
unsigned char CRC6_ITU(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x03;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly << 2);
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin);
}

CRC7

/****************************Info********************************************** 
 * Name:    CRC-7/MMC           x7+x3+1  
 * Width:	7
 * Poly:    0x09 
 * Init:    0x00 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x00 
 * Use:     MultiMediaCard,SD,ect. 
 *****************************************************************************/
unsigned char CRC7_MMC(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x09;
	
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ (wCPoly<<1);
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin>>1);
}

CRC8

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
/****************************Info********************************************** 
 * Name:    CRC-8               x8+x2+x+1 
 * Width:	8 
 * Poly:    0x07 
 * Init:    0x00 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
unsigned char CRC8(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x07;
	
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin);
}
/****************************Info********************************************** 
 * Name:    CRC-8/ITU           x8+x2+x+1 
 * Width:	8 
 * Poly:    0x07 
 * Init:    0x00 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x55 
 * Alias:   CRC-8/ATM 
 *****************************************************************************/
unsigned char CRC8_ITU(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x07;
	
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin^0x55);
}
/****************************Info********************************************** 
 * Name:    CRC-8/ROHC          x8+x2+x+1 
 * Width:	8 
 * Poly:    0x07 
 * Init:    0xFF 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x00 
 * Note: 
 *****************************************************************************/
#if 0
unsigned char CRC8_ROHC(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0xFF;
	unsigned char wCPoly = 0x07;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 0);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else 
unsigned char CRC8_ROHC(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0xFF;
	unsigned char wCPoly = 0x07;
	
	InvertUint8(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-8/MAXIM         x8+x5+x4+1 
 * Width:	8 
 * Poly:    0x31 
 * Init:    0x00 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x00 
 * Alias:   DOW-CRC,CRC-8/IBUTTON 
 * Use:     Maxim(Dallas)'s some devices,e.g. DS18B20 
 *****************************************************************************/ 
#if 0
unsigned char CRC8_MAXIM(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x31;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 0);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint8(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else 
unsigned char CRC8_MAXIM(unsigned char *data, unsigned int datalen)
{
	unsigned char wCRCin = 0x00;
	unsigned char wCPoly = 0x31;
	
	InvertUint8(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin);
}
#endif

CRC16

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
void InvertUint16(unsigned short *dBuf,unsigned short *srcBuf)
{
	int i;
	unsigned short tmp[4]={0};
 
	for(i=0;i< 16;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(15 - i);
	}
	dBuf[0] = tmp[0];
}
/****************************Info********************************************** 
 * Name:    CRC-16/CCITT        x16+x12+x5+1 
 * Width:	16
 * Poly:    0x1021 
 * Init:    0x0000 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x0000 
 * Alias:   CRC-CCITT,CRC-16/CCITT-TRUE,CRC-16/KERMIT 
 *****************************************************************************/ 
#if 0
unsigned short CRC16_CCITT(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x1021;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else 
//這里為了效率，我們不需要將所有Refin和refout為true的輸入輸出數(shù)據(jù)移位轉(zhuǎn)換
//只需要將poly二項式轉(zhuǎn)換后，運(yùn)算時將左移變?yōu)橛乙?/span>
unsigned short CRC16_CCITT(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x1021;
	unsigned char wChar = 0;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/CCITT-FALSE   x16+x12+x5+1 
 * Width:	16 
 * Poly:    0x1021 
 * Init:    0xFFFF 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x0000 
 * Note: 
 *****************************************************************************/ 
unsigned short CRC16_CCITT_FALSE(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x1021;
	
	while (datalen--) 	
	{
		wCRCin ^= *(data++) << 8;
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin);
}
/****************************Info********************************************** 
 * Name:    CRC-16/XMODEM       x16+x12+x5+1 
 * Width:	16 
 * Poly:    0x1021 
 * Init:    0x0000 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x0000 
 * Alias:   CRC-16/ZMODEM,CRC-16/ACORN 
 *****************************************************************************/ 
unsigned short CRC16_XMODEM(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x1021;
	
	while (datalen--) 	
	{
		wCRCin ^= (*(data++) << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin);
}
/****************************Info********************************************** 
 * Name:    CRC-16/X25          x16+x12+x5+1 
 * Width:	16 
 * Poly:    0x1021 
 * Init:    0xFFFF 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0XFFFF 
 * Note: 
 *****************************************************************************/
#if 0 
unsigned short CRC16_X25(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x1021;
	unsigned char wChar = 0;
 
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin^0xFFFF);
}
#else 
unsigned short CRC16_X25(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x1021;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin^0xFFFF);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/MODBUS       x16+x15+x2+1 
 * Width:	16 
 * Poly:    0x8005 
 * Init:    0xFFFF 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x0000 
 * Note: 
 *****************************************************************************/
#if 0 
unsigned short CRC16_MODBUS(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x8005;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else 
unsigned short CRC16_MODBUS(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x8005;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/IBM          x16+x15+x2+1 
 * Width:	16 
 * Poly:    0x8005 
 * Init:    0x0000 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0x0000 
 * Alias:   CRC-16,CRC-16/ARC,CRC-16/LHA 
 *****************************************************************************/ 
#if 0
unsigned short CRC16_IBM(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x8005;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin);
}
#else 
unsigned short CRC16_IBM(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x8005;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/MAXIM        x16+x15+x2+1 
 * Width:	16 
 * Poly:    0x8005 
 * Init:    0x0000 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0xFFFF 
 * Note: 
 *****************************************************************************/
#if 0
unsigned short CRC16_MAXIM(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x8005;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin^0xFFFF);
}
#else 
unsigned short CRC16_MAXIM(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x8005;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin^0xFFFF);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/USB          x16+x15+x2+1 
 * Width:	16 
 * Poly:    0x8005 
 * Init:    0xFFFF 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0xFFFF 
 * Note: 
 *****************************************************************************/ 
#if 0
unsigned short CRC16_USB(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x8005;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin^0xFFFF);
}
#else 
unsigned short CRC16_USB(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0xFFFF;
	unsigned short wCPoly = 0x8005;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin^0xFFFF);
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-16/DNP          x16+x13+x12+x11+x10+x8+x6+x5+x2+1 
 * Width:	16 
 * Poly:    0x3D65 
 * Init:    0x0000 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0xFFFF 
 * Use:     M-Bus,ect. 
 *****************************************************************************/  
#if 0
unsigned short CRC16_DNP(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x3D65;
	unsigned char wChar = 0;
	
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8(&wChar,&wChar);
		wCRCin ^= (wChar << 8);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x8000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint16(&wCRCin,&wCRCin);
	return (wCRCin^0xFFFF) ;
}
#else
unsigned short CRC16_DNP(unsigned char *data, unsigned int datalen)
{
	unsigned short wCRCin = 0x0000;
	unsigned short wCPoly = 0x3D65;
	
	InvertUint16(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = (wCRCin >> 1);
		}
	}
	return (wCRCin^0xFFFF);
}
#endif

CRC32

/****************************Info********************************************** 
 * Name:    InvertUint8 
 * Note: 	把字節(jié)顛倒過來，如0x12變成0x48
			0x12: 0001 0010
			0x48: 0100 1000
 *****************************************************************************/
void InvertUint8(unsigned char *dBuf,unsigned char *srcBuf)
{
	int i;
	unsigned char tmp[4]={0};
 
	for(i=0;i< 8;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(7-i);
	}
	dBuf[0] = tmp[0];
	
}
void InvertUint32(unsigned int *dBuf,unsigned int *srcBuf)
{
	int i;
	unsigned int tmp[4]={0};
	
	for(i=0;i< 32;i++)
	{
		if(srcBuf[0]& (1 << i))
		tmp[0]|=1<<(31 - i);
	}
	dBuf[0] = tmp[0];
}
/****************************Info********************************************** 
 * Name:    CRC-32  x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 
 * Width:	32 
 * Poly:    0x4C11DB7 
 * Init:    0xFFFFFFF 
 * Refin:   True 
 * Refout:  True 
 * Xorout:  0xFFFFFFF 
 * Alias:   CRC_32/ADCCP 
 * Use:     WinRAR,ect. 
 *****************************************************************************/  
#if 0
unsigned int CRC32(unsigned char *data, unsigned int datalen)
{
	unsigned int wCRCin = 0xFFFFFFFF;
	unsigned int wCPoly = 0x04C11DB7;
	unsigned int wChar = 0;
	while (datalen--) 	
	{
		wChar = *(data++);
		InvertUint8((unsigned char *)&wChar,(unsigned char *)&wChar);
		wCRCin ^= (wChar << 24);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80000000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	InvertUint32(&wCRCin,&wCRCin);
	return (wCRCin ^ 0xFFFFFFFF) ;
}
#else
unsigned int CRC32(unsigned char *data, unsigned int datalen)
{
 
	unsigned int wCRCin = 0xFFFFFFFF;
	unsigned int wCPoly = 0x04C11DB7;
 
	InvertUint32(&wCPoly,&wCPoly);
	while (datalen--) 	
	{
		wCRCin ^= *(data++);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x01)
				wCRCin = (wCRCin >> 1) ^ wCPoly;
			else
				wCRCin = wCRCin >> 1;
		}
	}
	return (wCRCin ^ 0xFFFFFFFF) ;
}
#endif
/****************************Info********************************************** 
 * Name:    CRC-32/MPEG-2  x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 
 * Width:	32 
 * Poly:    0x4C11DB7 
 * Init:    0xFFFFFFF 
 * Refin:   False 
 * Refout:  False 
 * Xorout:  0x0000000 
 * Note: 
 *****************************************************************************/ 
unsigned int CRC32_MPEG(unsigned char *data, unsigned int datalen)
{
 
	unsigned int wCRCin = 0xFFFFFFFF;
	unsigned int wCPoly = 0x04C11DB7;
	unsigned int wChar = 0;
	while (datalen--) 	
	{
		wChar = *(data++);
		wCRCin ^= (wChar << 24);
		for(int i = 0;i < 8;i++)
		{
			if(wCRCin & 0x80000000)
				wCRCin = (wCRCin << 1) ^ wCPoly;
			else
				wCRCin = wCRCin << 1;
		}
	}
	return (wCRCin) ;
}

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