crc16,crc32校验
crc16,crc32校验
-supermgr
crc16,crc32校验是计算机中经常用到的东西，
本文介绍的程序，使用查表法来进行crc16,crc32的校验。
//file: sp_crc.h
//crc 16bit 校验和计算
//返回校验和
unsigned short
sp_crc16(
void *buf, //数据区
size_t size //数据区大小
);
//crc 32bit 校验和计算
//返回校验和
unsigned long
sp_crc32(
void *buf, //数据区
size_t size //数据区大小
);
//file: sp_crc.cpp
//crc 16bit 校验表
static unsigned short crc16_table[256] = {
0X0000U, 0X1021U, 0X2042U, 0X3063U, 0X4084U, 0X50A5U, 0X60C6U, 0X70E7U,
0X8108U, 0X9129U, 0XA14AU, 0XB16BU, 0XC18CU, 0XD1ADU, 0XE1CEU, 0XF1EFU,
0X1231U, 0X0210U, 0X3273U, 0X2252U, 0X52B5U, 0X4294U, 0X72F7U, 0X62D6U,
0X9339U, 0X8318U, 0XB37BU, 0XA35AU, 0XD3BDU, 0XC39CU, 0XF3FFU, 0XE3DEU,
0X2462U, 0X3443U, 0X0420U, 0X1401U, 0X64E6U, 0X74C7U, 0X44A4U, 0X5485U,
0XA56AU, 0XB54BU, 0X8528U, 0X9509U, 0XE5EEU, 0XF5CFU, 0XC5ACU, 0XD58DU,
0X3653U, 0X2672U, 0X1611U, 0X0630U, 0X76D7U, 0X66F6U, 0X5695U, 0X46B4U,
0XB75BU, 0XA77AU, 0X9719U, 0X8738U, 0XF7DFU, 0XE7FEU, 0XD79DU, 0XC7BCU,
0X48C4U, 0X58E5U, 0X6886U, 0X78A7U, 0X0840U, 0X1861U, 0X2802U, 0X3823U,
0XC9CCU, 0XD9EDU, 0XE98EU, 0XF9AFU, 0X8948U, 0X9969U, 0XA90AU, 0XB92BU,
0X5AF5U, 0X4AD4U, 0X7AB7U, 0X6A96U, 0X1A71U, 0X0A50U, 0X3A33U, 0X2A12U,
0XDBFDU, 0XCBDCU, 0XFBBFU, 0XEB9EU, 0X9B79U, 0X8B58U, 0XBB3BU, 0XAB1AU,
0X6CA6U, 0X7C87U, 0X4CE4U, 0X5CC5U, 0X2C22U, 0X3C03U, 0X0C60U, 0X1C41U,
0XEDAEU, 0XFD8FU, 0XCDECU, 0XDDCDU, 0XAD2AU, 0XBD0BU, 0X8D68U, 0X9D49U,
0X7E97U, 0X6EB6U, 0X5ED5U, 0X4EF4U, 0X3E13U, 0X2E32U, 0X1E51U, 0X0E70U,
0XFF9FU, 0XEFBEU, 0XDFDDU, 0XCFFCU, 0XBF1BU, 0XAF3AU, 0X9F59U, 0X8F78U,
0X9188U, 0X81A9U, 0XB1CAU, 0XA1EBU, 0XD10CU, 0XC12DU, 0XF14EU, 0XE16FU,
0X1080U, 0X00A1U, 0X30C2U, 0X20E3U, 0X5004U, 0X4025U, 0X7046U, 0X6067U,
0X83B9U, 0X9398U, 0XA3FBU, 0XB3DAU, 0XC33DU, 0XD31CU, 0XE37FU, 0XF35EU,
0X02B1U, 0X1290U, 0X22F3U, 0X32D2U, 0X4235U, 0X5214U, 0X6277U, 0X7256U,
0XB5EAU, 0XA5CBU, 0X95A8U, 0X8589U, 0XF56EU, 0XE54FU, 0XD52CU, 0XC50DU,
0X34E2U, 0X24C3U, 0X14A0U, 0X0481U, 0X7466U, 0X6447U, 0X5424U, 0X4405U,
0XA7DBU, 0XB7FAU, 0X8799U, 0X97B8U, 0XE75FU, 0XF77EU, 0XC71DU, 0XD73CU,
0X26D3U, 0X36F2U, 0X0691U, 0X16B0U, 0X6657U, 0X7676U, 0X4615U, 0X5634U,
0XD94CU, 0XC96DU, 0XF90EU, 0XE92FU, 0X99C8U, 0X89E9U, 0XB98AU, 0XA9ABU,
0X5844U, 0X4865U, 0X7806U, 0X6827U, 0X18C0U, 0X08E1U, 0X3882U, 0X28A3U,
0XCB7DU, 0XDB5CU, 0XEB3FU, 0XFB1EU, 0X8BF9U, 0X9BD8U, 0XABBBU, 0XBB9AU,
0X4A75U, 0X5A54U, 0X6A37U, 0X7A16U, 0X0AF1U, 0X1AD0U, 0X2AB3U, 0X3A92U,
0XFD2EU, 0XED0FU, 0XDD6CU, 0XCD4DU, 0XBDAAU, 0XAD8BU, 0X9DE8U, 0X8DC9U,
0X7C26U, 0X6C07U, 0X5C64U, 0X4C45U, 0X3CA2U, 0X2C83U, 0X1CE0U, 0X0CC1U,
0XEF1FU, 0XFF3EU, 0XCF5DU, 0XDF7CU, 0XAF9BU, 0XBFBAU, 0X8FD9U, 0X9FF8U,
0X6E17U, 0X7E36U, 0X4E55U, 0X5E74U, 0X2E93U, 0X3EB2U, 0X0ED1U, 0X1EF0U
};
//crc 32bit 校验表
static unsigned long 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,
};
//ITU-T V.41
//x^16 + x^12 + x^15 + 1
unsigned short
sp_crc16(
void *buf,
size_t size
)
{
unsigned short crc;
unsigned char *data = (unsigned char *)buf;
crc = 0;
while (size )
{
crc = crc16_table[(crc >> 8 ^ *(data++)) & 0xFFU] ^ (crc << 8);
}
return crc;
}
//32bit
//初始化crc32表
void
init_crc32_table(
unsigned long crc32_table[256] //crc32表
)
{
unsigned long i,j;
unsigned long crc;
for (i = 0; i < 256; i++)
{
crc = i;
for (j = 0; j < 8; j++)
{
if (crc & 1)
{
crc = (crc >> 1) ^ 0xEDB88320;
}
else
{
crc >>= 1;
}
}
crc32_table[i] = crc;
}
}
unsigned long
sp_crc32(
void *buf,
size_t size
)
{
unsigned long crc;
unsigned char *data = (unsigned char *)buf;
crc = 0;
while (size )
{
crc = crc32_table[(crc ^ *(data++)) & 0xFFU] ^ (( crc >> 8) & 0x00FFFFFF);
}
return crc;
}