| #ifndef CRC32_BRAID_P_H_ |
| #define CRC32_BRAID_P_H_ |
| |
| #include "zendian.h" |
| |
| /* Define N */ |
| #ifdef Z_TESTN |
| # define N Z_TESTN |
| #else |
| # define N 5 |
| #endif |
| #if N < 1 || N > 6 |
| # error N must be in 1..6 |
| #endif |
| |
| /* |
| Define W and the associated z_word_t type. If W is not defined, then a |
| braided calculation is not used, and the associated tables and code are not |
| compiled. |
| */ |
| #ifdef Z_TESTW |
| # if Z_TESTW-1 != -1 |
| # define W Z_TESTW |
| # endif |
| #else |
| # ifndef W |
| # if defined(__x86_64__) || defined(_M_AMD64) || defined(__aarch64__) || defined(_M_ARM64) || defined(__powerpc64__) |
| # define W 8 |
| # else |
| # define W 4 |
| # endif |
| # endif |
| #endif |
| #ifdef W |
| # if W == 8 |
| typedef uint64_t z_word_t; |
| # else |
| # undef W |
| # define W 4 |
| typedef uint32_t z_word_t; |
| # endif |
| #endif |
| |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| # define ZSWAPWORD(word) (word) |
| # define BRAID_TABLE crc_braid_table |
| #elif BYTE_ORDER == BIG_ENDIAN |
| # if W == 8 |
| # define ZSWAPWORD(word) ZSWAP64(word) |
| # elif W == 4 |
| # define ZSWAPWORD(word) ZSWAP32(word) |
| # endif |
| # define BRAID_TABLE crc_braid_big_table |
| #else |
| # error "No endian defined" |
| #endif |
| |
| #define DO1 c = crc_table[(c ^ *buf++) & 0xff] ^ (c >> 8) |
| #define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1 |
| |
| /* CRC polynomial. */ |
| #define POLY 0xedb88320 /* p(x) reflected, with x^32 implied */ |
| |
| #endif /* CRC32_BRAID_P_H_ */ |