static inline uint64_t crc64_big()

in AliyunOSSSDK/aos_crc64.c [168:196]

• 28 lines of code
• 5 McCabe index (conditional complexity)

static inline uint64_t crc64_big(uint64_t crc, void *buf, size_t len)
{
    unsigned char *next = buf;

    ONCE(crc64_big_init);
    crc = ~rev8(crc);
    while (len && ((uintptr_t)next & 7) != 0) {
        crc = crc64_big_table[0][(crc >> 56) ^ *next++] ^ (crc << 8);
        len--;
    }
    while (len >= 8) {
        crc ^= *(uint64_t *)next;
        crc = crc64_big_table[0][crc & 0xff] ^
              crc64_big_table[1][(crc >> 8) & 0xff] ^
              crc64_big_table[2][(crc >> 16) & 0xff] ^
              crc64_big_table[3][(crc >> 24) & 0xff] ^
              crc64_big_table[4][(crc >> 32) & 0xff] ^
              crc64_big_table[5][(crc >> 40) & 0xff] ^
              crc64_big_table[6][(crc >> 48) & 0xff] ^
              crc64_big_table[7][crc >> 56];
        next += 8;
        len -= 8;
    }
    while (len) {
        crc = crc64_big_table[0][(crc >> 56) ^ *next++] ^ (crc << 8);
        len--;
    }
    return ~rev8(crc);
}