| /* |
| * There are multiple 16-bit CRC polynomials in common use, but this is |
| * *the* standard CRC-32 polynomial, first popularized by Ethernet. |
| * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0 |
| */ |
| #define CRCPOLY_LE 0xedb88320 |
| #define CRCPOLY_BE 0x04c11db7 |
| |
| /* |
| * This is the CRC32c polynomial, as outlined by Castagnoli. |
| * 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+ |
| * x^8+x^6+x^0 |
| */ |
| #define CRC32C_POLY_LE 0x82F63B78 |
| #define CRC32C_POLY_BE 0x1EDC6F41 |
| |
| /* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. */ |
| /* For less performance-sensitive, use 4 */ |
| #ifndef CRC_LE_BITS |
| # define CRC_LE_BITS 64 |
| #endif |
| #ifndef CRC_BE_BITS |
| # define CRC_BE_BITS 64 |
| #endif |
| |
| /* |
| * Little-endian CRC computation. Used with serial bit streams sent |
| * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. |
| */ |
| #if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ |
| CRC_LE_BITS & CRC_LE_BITS-1 |
| # error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
| #endif |
| |
| /* |
| * Big-endian CRC computation. Used with serial bit streams sent |
| * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. |
| */ |
| #if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ |
| CRC_BE_BITS & CRC_BE_BITS-1 |
| # error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
| #endif |
| |
| |
| #define ___constant_swab32(x) \ |
| ((uint32_t)( \ |
| (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ |
| (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ |
| (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ |
| (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) |
| |
| |
| #if (__GNUC__ >= 3) |
| #define likely(x) __builtin_expect(!!(x), 1) |
| #define unlikely(x) __builtin_expect(!!(x), 0) |
| #else |
| #define likely(x) (x) |
| #define unlikely(x) (x) |
| #endif |