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51 lines
980 B
51 lines
980 B
12 months ago
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#ifndef CRC32_BRAID_P_H_
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#define CRC32_BRAID_P_H_
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#include "zbuild.h"
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#include "zendian.h"
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/* Define N */
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#ifdef Z_TESTN
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# define N Z_TESTN
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#else
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# define N 5
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#endif
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#if N < 1 || N > 6
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# error N must be in 1..6
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#endif
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/*
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Define W and the associated z_word_t type. If W is not defined, then a
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braided calculation is not used, and the associated tables and code are not
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compiled.
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*/
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#ifdef Z_TESTW
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# if Z_TESTW-1 != -1
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# define W Z_TESTW
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# endif
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#else
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# ifndef W
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# if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__)
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# define W 8
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# else
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# define W 4
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# endif
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# endif
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#endif
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#ifdef W
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# if W == 8
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typedef uint64_t z_word_t;
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# else
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# undef W
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# define W 4
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typedef uint32_t z_word_t;
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# endif
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#endif
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/* CRC polynomial. */
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#define POLY 0xedb88320 /* p(x) reflected, with x^32 implied */
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extern uint32_t PREFIX(crc32_braid)(uint32_t crc, const uint8_t *buf, size_t len);
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#endif /* CRC32_BRAID_P_H_ */
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