osdep.h

给出了 zip 压缩算法的完整实现过程。

/*
  Copyright (c) 1990-2005 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2004-May-22 or later
  (the contents of which are also included in zip.h) for terms of use.
  If, for some reason, both of these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.htmlhtml
*/
/* The symbol DOS is used throughout the Zip source to identify code portions
 * specific to the MSDOS port.
 * Just to make sure, we check that it is set.
 * (Currently, this should should not be neccessary, since currently it has
 * to be set on the compiler command line to get this file read in.)
 */
#ifndef DOS
#  define DOS
#endif

/* The symbol MSDOS is consistently used in the generic source files
 * to identify code to support for MSDOS (and MSDOS related) stuff.
 * e.g: FAT or (FAT like) file systems,
 *      '\\' as directory separator in paths,
 *      "\r\n" as record (line) terminator in text files, ...
 *
 * IMPORTANT Note:
 *  This symbol is not unique for the MSDOS port !!!!!!
 *  It is also defined by ports to some other OS which are (to some extend)
 *  considered DOS compatible.
 *  Examples are: OS/2 (OS2), Windows NT and Windows 95 (WIN32).
 *
 */
#ifndef MSDOS
#  define MSDOS
#endif

/* Power C is similar to Turbo C */
#ifdef __POWERC
#  define __TURBOC__
#endif /* __POWERC */

/* Automatic setting of the common Microsoft C idenfifier MSC.
 * NOTE: Watcom also defines M_I*86 !
 */
#if defined(_MSC_VER) || (defined(M_I86) && !defined(__WATCOMC__))
#  ifndef MSC
#    define MSC                 /* This should work for older MSC, too!  */
#  endif
#endif

#if !defined(__GO32__) && !defined(__EMX__)
#  define NO_UNISTD_H
#endif

#if defined(__WATCOMC__) && defined(__386__)
#  define WATCOMC_386
#endif

#ifdef WINDLL
#  define MSWIN
#  define MEMORY16
#endif


#if !defined(__EMX__) && !defined(__GO32__) && !defined(WATCOMC_386)
#if !defined(WINDLL)
#  define MSDOS16 /* 16 bit MSDOS only */
#  define MEMORY16
#endif
#endif

#if !defined(NO_ASM) && !defined(ASMV)
#  define ASMV
#endif

/* enable creation of UTC time fields unless explicitely suppressed */
#if !defined(NO_EF_UT_TIME) && !defined(USE_EF_UT_TIME)
#  define USE_EF_UT_TIME
#endif

/* check that TZ environment variable is defined before using UTC times */
#if (!defined(NO_IZ_CHECK_TZ) && !defined(IZ_CHECK_TZ))
#  define IZ_CHECK_TZ
#endif

#ifdef MEMORY16
#  ifndef NO_ASM
#    define ASM_CRC 1
#  endif /* ?NO_ASM */
#  ifdef __TURBOC__
#    include <alloc.h>
#    if defined(__COMPACT__) || defined(__LARGE__) || defined(__HUGE__)
#      if defined(DYNAMIC_CRC_TABLE) && defined(DYNALLOC_CRCTAB)
        error: No dynamic CRC table allocation with Borland C far data models.
#      endif /* DYNAMIC_CRC_TABLE */
#    endif /* Turbo/Borland C far data memory models */
#    define nearmalloc malloc
#    define nearfree   free
#    define DYN_ALLOC
#  else /* !__TURBOC__ */
#    include <malloc.h>
#    define nearmalloc _nmalloc
#    define nearfree   _nfree
#    define farmalloc  _fmalloc
#    define farfree    _ffree
#  endif /* ?__TURBOC__ */
#  define MY_ZCALLOC 1
#  ifdef SMALL_MEM
#    define CBSZ 2048
#    define ZBSZ 2048
#  endif
#  ifdef MEDIUM_MEM
#    define CBSZ 4096
#    define ZBSZ 4096
#  endif
#  ifndef CBSZ
#    define CBSZ 8192
#    define ZBSZ 8192
#  endif
#endif /* MEMORY16 */


#ifdef MATCH
#  undef MATCH
#endif
#define MATCH dosmatch          /* use DOS style wildcard matching */

#define USE_CASE_MAP

#define ROUNDED_TIME(time)  (((time) + 1) & (~1))
#define PROCNAME(n) (action == ADD || action == UPDATE ? wild(n) : \
                     procname(n, 1))

#define FOPR "rb"
#define FOPM "r+b"
#define FOPW "wb"

#include <sys/types.h>
#include <sys/stat.h>
#include <io.h>

#ifdef ZCRYPT_INTERNAL
#  ifdef WINDLL
#    define ZCR_SEED2     (unsigned)3141592654L /* use PI as seed pattern */
#  else
#    ifndef __GO32__
#      include <process.h>      /* getpid() declaration for srand seed */
#    endif
#  endif
#endif

/*
 * djgpp 1.x did not declare these
 */
#if defined(__GO32__) && !defined(__DJGPP__)
char *strlwr(char *);
int setmode(int, int);
#endif

#ifdef __WATCOMC__
#  define NO_MKTEMP
#  define HAS_OPENDIR
#  define SSTAT stat_bandaid
   int stat_bandaid(const char *path, struct stat *buf);

/* Get asm routines to link properly without using "__cdecl": */
#  ifdef __386__
#    ifdef ASMV
#      pragma aux match_init    "_*" parm caller [] modify []
#      pragma aux longest_match "_*" parm caller [] value [eax] \
                                      modify [eax ecx edx]
#    endif
#    ifndef USE_ZLIB
#      pragma aux crc32         "_*" parm caller [] value [eax] modify [eax]
#      pragma aux get_crc_table "_*" parm caller [] value [eax] \
                                      modify [eax ecx edx]
#    endif /* !USE_ZLIB */
#  else /* !__386__ */
#    ifdef ASMV
#      pragma aux match_init    "_*" parm caller [] loadds modify [ax bx]
#      pragma aux longest_match "_*" parm caller [] loadds value [ax] \
                                      modify [ax bx cx dx es]
#    endif /* ASMV */
#    ifndef USE_ZLIB
#      pragma aux crc32         "_*" parm caller [] value [ax dx] \
                                      modify [ax bx cx dx es]
#      pragma aux get_crc_table "_*" parm caller [] value [ax] \
                                      modify [ax bx cx dx]
#    endif /* !USE_ZLIB */
#  endif /* ?__386__ */
#endif /* __WATCOMC__ */

/*
 * Wrapper function to get around the MSC7 00:00:00 31 Dec 1899 time base,
 * see msdos.c for more info
 */

#if defined(_MSC_VER) && _MSC_VER == 700
#  define localtime(t) msc7_localtime(t)
#endif

#if (defined(__TURBOC__) && !defined(__BORLANDC__) && __TURBOC__ <= 0x0201)
#  ifndef NO_MKTIME
#    define NO_MKTIME           /* TC 2.01 and earlier do not supply mktime() */
#  endif
#endif

void check_for_windows(const char *app);