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41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
#ifndef CRC32_BRAID_P_H_
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#define CRC32_BRAID_P_H_
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#include "zendian.h"
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/* Define BRAID_N, valid range is 1..6 */
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#define BRAID_N 5
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/* Define BRAID_W and the associated z_word_t type. If BRAID_W is not defined, then a braided
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calculation is not used, and the associated tables and code are not compiled.
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*/
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#if defined(__x86_64__) || defined(_M_AMD64) || defined(__aarch64__) || defined(_M_ARM64) || defined(__powerpc64__)
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# define BRAID_W 8
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typedef uint64_t z_word_t;
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#else
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# define BRAID_W 4
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typedef uint32_t z_word_t;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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# define ZSWAPWORD(word) (word)
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# define BRAID_TABLE crc_braid_table
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#elif BYTE_ORDER == BIG_ENDIAN
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# if BRAID_W == 8
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# define ZSWAPWORD(word) ZSWAP64(word)
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# elif BRAID_W == 4
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# define ZSWAPWORD(word) ZSWAP32(word)
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# endif
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# define BRAID_TABLE crc_braid_big_table
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#else
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# error "No endian defined"
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#endif
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#define CRC_DO1 c = crc_table[(c ^ *buf++) & 0xff] ^ (c >> 8)
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#define CRC_DO8 CRC_DO1; CRC_DO1; CRC_DO1; CRC_DO1; CRC_DO1; CRC_DO1; CRC_DO1; CRC_DO1
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/* CRC polynomial. */
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#define POLY 0xedb88320 /* p(x) reflected, with x^32 implied */
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#endif /* CRC32_BRAID_P_H_ */
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