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45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
#ifndef __crc32_h
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#define __crc32_h
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#include "third_party/zip/zip.h"
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/* clang-format off */
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#ifndef OF
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# define OF(a) a
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#endif
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#ifndef ZCONST
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# define ZCONST const
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#endif
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#ifdef DYNALLOC_CRCTAB
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void free_crc_table OF((void));
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#endif
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#ifndef USE_ZLIB
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ZCONST ulg near *get_crc_table OF((void));
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#endif
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#if (defined(USE_ZLIB) || defined(CRC_TABLE_ONLY))
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# ifdef IZ_CRC_BE_OPTIMIZ
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# undef IZ_CRC_BE_OPTIMIZ
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# endif
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#else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
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ulg crc32 OF((ulg crc, ZCONST uch *buf, extent len));
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#endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
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#ifndef CRC_32_TAB
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# define CRC_32_TAB crc_32_tab
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#endif
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#ifdef CRC32
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# undef CRC32
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#endif
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#ifdef IZ_CRC_BE_OPTIMIZ
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# define CRC32UPD(c, crctab) (crctab[((c) >> 24)] ^ ((c) << 8))
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# define CRC32(c, b, crctab) (crctab[(((int)(c) >> 24) ^ (b))] ^ ((c) << 8))
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# define REV_BE(w) (((w)>>24)+(((w)>>8)&0xff00)+ \
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(((w)&0xff00)<<8)+(((w)&0xff)<<24))
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#else
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# define CRC32UPD(c, crctab) (crctab[((int)(c)) & 0xff] ^ ((c) >> 8))
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# define CRC32(c, b, crctab) (crctab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
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# define REV_BE(w) w
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#endif
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#endif /* !__crc32_h */
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