2 * This is the CRC32c polynomial, as outlined by Castagnoli.
3 * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
6 #define CRCPOLY_LE 0x82F63B78
7 #define CRCPOLY_BE 0x1EDC6F41
9 /* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. */
10 /* For less performance-sensitive, use 4 */
12 # define CRC_LE_BITS 64
15 # define CRC_BE_BITS 64
19 * Little-endian CRC computation. Used with serial bit streams sent
20 * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC.
22 #if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
23 CRC_LE_BITS & CRC_LE_BITS-1
24 # error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}"
28 * Big-endian CRC computation. Used with serial bit streams sent
29 * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC.
31 #if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
32 CRC_BE_BITS & CRC_BE_BITS-1
33 # error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}"
37 #define ___constant_swab32(x) \
39 (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
40 (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
41 (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
42 (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
46 #define likely(x) __builtin_expect(!!(x), 1)
47 #define unlikely(x) __builtin_expect(!!(x), 0)
50 #define unlikely(x) (x)