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65 lines
1.3 KiB
C
65 lines
1.3 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 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(_M_AMD64) || defined(__aarch64__) || defined(_M_ARM64) || 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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#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 W == 8
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# define ZSWAPWORD(word) ZSWAP64(word)
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# elif 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 DO1 c = crc_table[(c ^ *buf++) & 0xff] ^ (c >> 8)
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#define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; 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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