网上看到的一个CRC8 CRC16 CRC32的源码

#include \"crc.h\"

#ifdef _C51
#define _flash code
#define _FLASH _flash
#endif

#ifdef _C32
#define _flash const
#define _FLASH _flash
#endif


#ifdef _CRC8
// X^8 + X^2 + X^1 + 1
u8 _flash CRC8_TAB[256] = {
    0x00,0x07,0x0E,0x09,0x1C,0x1B,0x12,0x15,0x38,0x3F,0x36,0x31,0x24,0x23,0x2A,0x2D,
    0x70,0x77,0x7E,0x79,0x6C,0x6B,0x62,0x65,0x48,0x4F,0x46,0x41,0x54,0x53,0x5A,0x5D,
    0xE0,0xE7,0xEE,0xE9,0xFC,0xFB,0xF2,0xF5,0xD8,0xDF,0xD6,0xD1,0xC4,0xC3,0xCA,0xCD,
    0x90,0x97,0x9E,0x99,0x8C,0x8B,0x82,0x85,0xA8,0xAF,0xA6,0xA1,0xB4,0xB3,0xBA,0xBD,
    0xC7,0xC0,0xC9,0xCE,0xDB,0xDC,0xD5,0xD2,0xFF,0xF8,0xF1,0xF6,0xE3,0xE4,0xED,0xEA,
    0xB7,0xB0,0xB9,0xBE,0xAB,0xAC,0xA5,0xA2,0x8F,0x88,0x81,0x86,0x93,0x94,0x9D,0x9A,
    0x27,0x20,0x29,0x2E,0x3B,0x3C,0x35,0x32,0x1F,0x18,0x11,0x16,0x03,0x04,0x0D,0x0A,
    0x57,0x50,0x59,0x5E,0x4B,0x4C,0x45,0x42,0x6F,0x68,0x61,0x66,0x73,0x74,0x7D,0x7A,
    0x89,0x8E,0x87,0x80,0x95,0x92,0x9B,0x9C,0xB1,0xB6,0xBF,0xB8,0xAD,0xAA,0xA3,0xA4,
    0xF9,0xFE,0xF7,0xF0,0xE5,0xE2,0xEB,0xEC,0xC1,0xC6,0xCF,0xC8,0xDD,0xDA,0xD3,0xD4,
    0x69,0x6E,0x67,0x60,0x75,0x72,0x7B,0x7C,0x51,0x56,0x5F,0x58,0x4D,0x4A,0x43,0x44,
    0x19,0x1E,0x17,0x10,0x05,0x02,0x0B,0x0C,0x21,0x26,0x2F,0x28,0x3D,0x3A,0x33,0x34,
    0x4E,0x49,0x40,0x47,0x52,0x55,0x5C,0x5B,0x76,0x71,0x78,0x7F,0x6A,0x6D,0x64,0x63,
    0x3E,0x39,0x30,0x37,0x22,0x25,0x2C,0x2B,0x06,0x01,0x08,0x0F,0x1A,0x1D,0x14,0x13,
    0xAE,0xA9,0xA0,0xA7,0xB2,0xB5,0xBC,0xBB,0x96,0x91,0x98,0x9F,0x8A,0x8D,0x84,0x83,
    0xDE,0xD9,0xD0,0xD7,0xC2,0xC5,0xCC,0xCB,0xE6,0xE1,0xE8,0xEF,0xFA,0xFD,0xF4,0xF3
};

u8 GetCRC8(u8 * ucPtr, u8 ucLen)
{
    u8 ucIndex;        // CRC8校验表格索引
    u8 ucCRC8 = 0;     // CRC8字节初始化
    while (ucLen --)
    {   // 进行CRC8位校验
        ucIndex = ucCRC8 ^ (* ucPtr ++);
        ucCRC8 = CRC8_TAB[ucIndex];
    }
    return (~ucCRC8); // 返回CRC8校验数据
}
#endif



#ifdef _CRC16
u8 _flash chCRCHTalbe[]={
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
0x00, 0xC1, 0x81, 0x40};

u8 _flash chCRCLTalbe[] = {
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
0x41, 0x81, 0x80, 0x40};

u16 GetCRC16(u8* pchMsg, u16 wDataLen)
{
    u8 chCRCHi = 0xFF; // 高CRC字节初始化
    u8 chCRCLo = 0xFF; // 低CRC字节初始化
    u16 wIndex;         // CRC循环中的索引

    while (wDataLen--)
    {
         // 计算CRC
         wIndex = chCRCLo ^ *pchMsg++ ;
         chCRCLo = chCRCHi ^ chCRCHTalbe[wIndex];
         chCRCHi = chCRCLTalbe[wIndex] ;
    }
    return ((chCRCHi << 8) | chCRCLo) ;
}
#endif


#ifdef _CRC32
/* crc32码表生成函数
u32  CRC32_Table[256]={0};
void init_CRC32_table()
{
    for (int i = 0; i != 256; i++)
    {
        u32 CRC = i;
        for (int j = 0; j != 8; j++)
        {
            if (CRC & 1)
             CRC = (CRC >> 1) ^ 0xEDB88320;
            else
             CRC >>= 1;
        }
        CRC32_Table[i] = CRC;
    }
}
*/

static u32 _flash CRC32_Table[256] =
{
   0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
   0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
   0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
   0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
   0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
   0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
   0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
   0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
   0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
   0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
   0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
   0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
   0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
   0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
   0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
   0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
   0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
   0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
   0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
   0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
   0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
   0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
   0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
   0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
   0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
   0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
   0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
   0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
   0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
   0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
   0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
   0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
   0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
   0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
   0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
   0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
   0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
   0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
   0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
   0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
   0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
   0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
   0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
   0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
   0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
   0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
   0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
   0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
   0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
   0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
   0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
   0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
   0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
   0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
   0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
   0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
   0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
   0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
   0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
   0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
   0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
   0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
   0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
   0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

static u32 GetCRC32 ( void *pStart, u32 uSize)
{
    #define INIT  0xffffffff
    #define XOROT 0xffffffff

    u32 uCRCValue;
    u8 *pData;

    /* init the start value */
    uCRCValue = INIT;
    pData = pStart;

    /* calculate CRC */
    while (uSize --)
    {
        uCRCValue = CRC32_Table[(uCRCValue ^ *pData++) & 0xFF] ^ (uCRCValue >> 8);
    }
    /* XOR the output value */
    return uCRCValue ^ XOROT;
}
#endif