61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/*
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Copyright (c) 1990-2008 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2000-Apr-09 or later
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(the contents of which are also included in zip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/* crc32.h -- compute the CRC-32 of a data stream
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* Copyright (C) 1995 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#ifndef __crc32_h
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#define __crc32_h /* identifies this source module */
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/* This header should be read AFTER zip.h resp. unzip.h
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* (the latter with UNZIP_INTERNAL defined...).
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*/
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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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