1/*
2  Copyright (c) 1990-2008 Info-ZIP.  All rights reserved.
3
4  See the accompanying file LICENSE, version 2000-Apr-09 or later
5  (the contents of which are also included in zip.h) for terms of use.
6  If, for some reason, all these files are missing, the Info-ZIP license
7  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
8*/
9/* crc32.h -- compute the CRC-32 of a data stream
10 * Copyright (C) 1995 Mark Adler
11 * For conditions of distribution and use, see copyright notice in zlib.h
12 */
13
14#ifndef __crc32_h
15#define __crc32_h       /* identifies this source module */
16
17/* This header should be read AFTER zip.h resp. unzip.h
18 * (the latter with UNZIP_INTERNAL defined...).
19 */
20
21#ifndef OF
22#  define OF(a) a
23#endif
24#ifndef ZCONST
25#  define ZCONST const
26#endif
27
28#ifdef DYNALLOC_CRCTAB
29   void     free_crc_table  OF((void));
30#endif
31#ifndef USE_ZLIB
32   ZCONST ulg near *get_crc_table  OF((void));
33#endif
34#if (defined(USE_ZLIB) || defined(CRC_TABLE_ONLY))
35#  ifdef IZ_CRC_BE_OPTIMIZ
36#    undef IZ_CRC_BE_OPTIMIZ
37#  endif
38#else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
39   ulg      crc32           OF((ulg crc, ZCONST uch *buf, extent len));
40#endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
41
42#ifndef CRC_32_TAB
43#  define CRC_32_TAB     crc_32_tab
44#endif
45
46#ifdef CRC32
47#  undef CRC32
48#endif
49#ifdef IZ_CRC_BE_OPTIMIZ
50#  define CRC32UPD(c, crctab) (crctab[((c) >> 24)] ^ ((c) << 8))
51#  define CRC32(c, b, crctab) (crctab[(((int)(c) >> 24) ^ (b))] ^ ((c) << 8))
52#  define REV_BE(w) (((w)>>24)+(((w)>>8)&0xff00)+ \
53                    (((w)&0xff00)<<8)+(((w)&0xff)<<24))
54#else
55#  define CRC32UPD(c, crctab) (crctab[((int)(c)) & 0xff] ^ ((c) >> 8))
56#  define CRC32(c, b, crctab) (crctab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
57#  define REV_BE(w) w
58#endif
59
60#endif /* !__crc32_h */
61