关于数据的分段crc32校验
以下代码来自ambiq apollo 3.5 SDK
static const uint32_t crc32Table[256] =
{0x00000000U, 0x77073096U, 0xEE0E612CU, 0x990951BAU,0x076DC419U, 0x706AF48FU, 0xE963A535U, 0x9E6495A3U,0x0EDB8832U, 0x79DCB8A4U, 0xE0D5E91EU, 0x97D2D988U,0x09B64C2BU, 0x7EB17CBDU, 0xE7B82D07U, 0x90BF1D91U,0x1DB71064U, 0x6AB020F2U, 0xF3B97148U, 0x84BE41DEU,0x1ADAD47DU, 0x6DDDE4EBU, 0xF4D4B551U, 0x83D385C7U,0x136C9856U, 0x646BA8C0U, 0xFD62F97AU, 0x8A65C9ECU,0x14015C4FU, 0x63066CD9U, 0xFA0F3D63U, 0x8D080DF5U,0x3B6E20C8U, 0x4C69105EU, 0xD56041E4U, 0xA2677172U,0x3C03E4D1U, 0x4B04D447U, 0xD20D85FDU, 0xA50AB56BU,0x35B5A8FAU, 0x42B2986CU, 0xDBBBC9D6U, 0xACBCF940U,0x32D86CE3U, 0x45DF5C75U, 0xDCD60DCFU, 0xABD13D59U,0x26D930ACU, 0x51DE003AU, 0xC8D75180U, 0xBFD06116U,0x21B4F4B5U, 0x56B3C423U, 0xCFBA9599U, 0xB8BDA50FU,0x2802B89EU, 0x5F058808U, 0xC60CD9B2U, 0xB10BE924U,0x2F6F7C87U, 0x58684C11U, 0xC1611DABU, 0xB6662D3DU,0x76DC4190U, 0x01DB7106U, 0x98D220BCU, 0xEFD5102AU,0x71B18589U, 0x06B6B51FU, 0x9FBFE4A5U, 0xE8B8D433U,0x7807C9A2U, 0x0F00F934U, 0x9609A88EU, 0xE10E9818U,0x7F6A0DBBU, 0x086D3D2DU, 0x91646C97U, 0xE6635C01U,0x6B6B51F4U, 0x1C6C6162U, 0x856530D8U, 0xF262004EU,0x6C0695EDU, 0x1B01A57BU, 0x8208F4C1U, 0xF50FC457U,0x65B0D9C6U, 0x12B7E950U, 0x8BBEB8EAU, 0xFCB9887CU,0x62DD1DDFU, 0x15DA2D49U, 0x8CD37CF3U, 0xFBD44C65U,0x4DB26158U, 0x3AB551CEU, 0xA3BC0074U, 0xD4BB30E2U,0x4ADFA541U, 0x3DD895D7U, 0xA4D1C46DU, 0xD3D6F4FBU,0x4369E96AU, 0x346ED9FCU, 0xAD678846U, 0xDA60B8D0U,0x44042D73U, 0x33031DE5U, 0xAA0A4C5FU, 0xDD0D7CC9U,0x5005713CU, 0x270241AAU, 0xBE0B1010U, 0xC90C2086U,0x5768B525U, 0x206F85B3U, 0xB966D409U, 0xCE61E49FU,0x5EDEF90EU, 0x29D9C998U, 0xB0D09822U, 0xC7D7A8B4U,0x59B33D17U, 0x2EB40D81U, 0xB7BD5C3BU, 0xC0BA6CADU,0xEDB88320U, 0x9ABFB3B6U, 0x03B6E20CU, 0x74B1D29AU,0xEAD54739U, 0x9DD277AFU, 0x04DB2615U, 0x73DC1683U,0xE3630B12U, 0x94643B84U, 0x0D6D6A3EU, 0x7A6A5AA8U,0xE40ECF0BU, 0x9309FF9DU, 0x0A00AE27U, 0x7D079EB1U,0xF00F9344U, 0x8708A3D2U, 0x1E01F268U, 0x6906C2FEU,0xF762575DU, 0x806567CBU, 0x196C3671U, 0x6E6B06E7U,0xFED41B76U, 0x89D32BE0U, 0x10DA7A5AU, 0x67DD4ACCU,0xF9B9DF6FU, 0x8EBEEFF9U, 0x17B7BE43U, 0x60B08ED5U,0xD6D6A3E8U, 0xA1D1937EU, 0x38D8C2C4U, 0x4FDFF252U,0xD1BB67F1U, 0xA6BC5767U, 0x3FB506DDU, 0x48B2364BU,0xD80D2BDAU, 0xAF0A1B4CU, 0x36034AF6U, 0x41047A60U,0xDF60EFC3U, 0xA867DF55U, 0x316E8EEFU, 0x4669BE79U,0xCB61B38CU, 0xBC66831AU, 0x256FD2A0U, 0x5268E236U,0xCC0C7795U, 0xBB0B4703U, 0x220216B9U, 0x5505262FU,0xC5BA3BBEU, 0xB2BD0B28U, 0x2BB45A92U, 0x5CB36A04U,0xC2D7FFA7U, 0xB5D0CF31U, 0x2CD99E8BU, 0x5BDEAE1DU,0x9B64C2B0U, 0xEC63F226U, 0x756AA39CU, 0x026D930AU,0x9C0906A9U, 0xEB0E363FU, 0x72076785U, 0x05005713U,0x95BF4A82U, 0xE2B87A14U, 0x7BB12BAEU, 0x0CB61B38U,0x92D28E9BU, 0xE5D5BE0DU, 0x7CDCEFB7U, 0x0BDBDF21U,0x86D3D2D4U, 0xF1D4E242U, 0x68DDB3F8U, 0x1FDA836EU,0x81BE16CDU, 0xF6B9265BU, 0x6FB077E1U, 0x18B74777U,0x88085AE6U, 0xFF0F6A70U, 0x66063BCAU, 0x11010B5CU,0x8F659EFFU, 0xF862AE69U, 0x616BFFD3U, 0x166CCF45U,0xA00AE278U, 0xD70DD2EEU, 0x4E048354U, 0x3903B3C2U,0xA7672661U, 0xD06016F7U, 0x4969474DU, 0x3E6E77DBU,0xAED16A4AU, 0xD9D65ADCU, 0x40DF0B66U, 0x37D83BF0U,0xA9BCAE53U, 0xDEBB9EC5U, 0x47B2CF7FU, 0x30B5FFE9U,0xBDBDF21CU, 0xCABAC28AU, 0x53B39330U, 0x24B4A3A6U,0xBAD03605U, 0xCDD70693U, 0x54DE5729U, 0x23D967BFU,0xB3667A2EU, 0xC4614AB8U, 0x5D681B02U, 0x2A6F2B94U,0xB40BBE37U, 0xC30C8EA1U, 0x5A05DF1BU, 0x2D02EF8DU
};/*************************************************************************************************/
/*!* \fn CalcCrc32** \brief Calculate the CRC-32 of the given buffer.** \param crcInit Initial value of the CRC.* \param len Length of the buffer.* \param pBuf Buffer to compute the CRC.** \return None.** This routine was originally generated with crcmod.py using the following parameters:* - polynomial 0x104C11DB7* - bit reverse algorithm*//*************************************************************************************************/
uint32_t CalcCrc32(uint32_t crcInit, uint8_t* pBuf, uint32_t len)
{uint32_t crc = crcInit;while(len > 0){crc = crc32Table[*pBuf ^ (uint8_t)crc] ^ (crc >> 8);pBuf++;len--;}crc = crc ^ 0xFFFFFFFFU;return crc;
}一段数据分多次校验时，应设置初始值为0，随后作为参数传递进去的初始值都需要异或0xffffffff,如
int main()
{printf("hello\n");fp = fopen("B3_3.0.50_0001C000_000ADBE8_343ED98D.bin", "rb");fseek(fp, 0L, SEEK_END);uint32_t size = ftell(fp);printf("File Size: %d\n", size);fseek(fp, 0, SEEK_SET);uint32_t init_crc = 0;for(uint32_t i = 0; i < size / 4096; i++){fread(buf, 1, 4096, fp);init_crc = CalcCrc32(init_crc ^ 0xffffffff, buf, 4096);}if(size % 4096 != 0){fread(buf, 1, size % 4096, fp);init_crc = CalcCrc32(init_crc ^ 0xffffffff, buf, size % 4096);}printf("last crc: %08X\n", init_crc);fclose(fp);system("pause");
}输出结果：
与文件名（B3_3.0.50_0001C000_000ADBE8_343ED98D.bin）中的最后一段相符（最后一段为本文件的CRC32值，用python3 zlib crc32生成）
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