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50 lines
980 B
50 lines
980 B
#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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