static void crc64_init()

in AliyunOSSSDK/aos_crc64.c [57:78]

• 18 lines of code
• 6 McCabe index (conditional complexity)

static void crc64_init(uint64_t table[][256])
{
    unsigned n, k;
    uint64_t crc;

    /* generate CRC-64's for all single byte sequences */
    for (n = 0; n < 256; n++) {
        crc = n;
        for (k = 0; k < 8; k++)
            crc = crc & 1 ? POLY ^ (crc >> 1) : crc >> 1;
        table[0][n] = crc;
    }

    /* generate CRC-64's for those followed by 1 to 7 zeros */
    for (n = 0; n < 256; n++) {
        crc = table[0][n];
        for (k = 1; k < 8; k++) {
            crc = table[0][crc & 0xff] ^ (crc >> 8);
            table[k][n] = crc;
        }
    }
}