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- /*
- Copyright (c) 1990-2008 Info-ZIP. All rights reserved.
-
- See the accompanying file LICENSE, version 2000-Apr-09 or later
- (the contents of which are also included in zip.h) for terms of use.
- If, for some reason, all these files are missing, the Info-ZIP license
- also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
- */
- /* crc32.h -- compute the CRC-32 of a data stream
- * Copyright (C) 1995 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
- #ifndef __crc32_h
- #define __crc32_h /* identifies this source module */
-
- /* This header should be read AFTER zip.h resp. unzip.h
- * (the latter with UNZIP_INTERNAL defined...).
- */
-
- #ifndef OF
- # define OF(a) a
- #endif
- #ifndef ZCONST
- # define ZCONST const
- #endif
-
- #ifdef DYNALLOC_CRCTAB
- void free_crc_table OF((void));
- #endif
- #ifndef USE_ZLIB
- ZCONST ulg near *get_crc_table OF((void));
- #endif
- #if (defined(USE_ZLIB) || defined(CRC_TABLE_ONLY))
- # ifdef IZ_CRC_BE_OPTIMIZ
- # undef IZ_CRC_BE_OPTIMIZ
- # endif
- #else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
- ulg crc32 OF((ulg crc, ZCONST uch *buf, extent len));
- #endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
-
- #ifndef CRC_32_TAB
- # define CRC_32_TAB crc_32_tab
- #endif
-
- #ifdef CRC32
- # undef CRC32
- #endif
- #ifdef IZ_CRC_BE_OPTIMIZ
- # define CRC32UPD(c, crctab) (crctab[((c) >> 24)] ^ ((c) << 8))
- # define CRC32(c, b, crctab) (crctab[(((int)(c) >> 24) ^ (b))] ^ ((c) << 8))
- # define REV_BE(w) (((w)>>24)+(((w)>>8)&0xff00)+ \
- (((w)&0xff00)<<8)+(((w)&0xff)<<24))
- #else
- # define CRC32UPD(c, crctab) (crctab[((int)(c)) & 0xff] ^ ((c) >> 8))
- # define CRC32(c, b, crctab) (crctab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
- # define REV_BE(w) w
- #endif
-
- #endif /* !__crc32_h */
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