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- #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_ */
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