fileio.c

完整的解压zip文件的源码。包含密码功能

#ifdef DLL

/*****************************/
/* Function UzpMessageNull() */  /* convenience routine for no output at all */
/*****************************/

int UZ_EXP UzpMessageNull(pG, buf, size, flag)
    zvoid *pG;    /* globals struct:  always passed */
    uch *buf;     /* preformatted string to be printed */
    ulg size;     /* length of string (may include nulls) */
    int flag;     /* flag bits */
{
    return 0;

} /* end function UzpMessageNull() */

#endif /* DLL */





/***********************/
/* Function UzpInput() */   /* GRR:  this is a placeholder for now */
/***********************/

int UZ_EXP UzpInput(pG, buf, size, flag)
    zvoid *pG;    /* globals struct:  always passed */
    uch *buf;     /* preformatted string to be printed */
    int *size;    /* (address of) size of buf and of returned string */
    int flag;     /* flag bits (bit 0: no echo) */
{
    /* tell picky compilers to shut up about "unused variable" warnings */
    pG = pG; buf = buf; flag = flag;

    *size = 0;
    return 0;

} /* end function UzpInput() */





#if (!defined(WINDLL) && !defined(MACOS))

/***************************/
/* Function UzpMorePause() */
/***************************/

void UZ_EXP UzpMorePause(pG, prompt, flag)
    zvoid *pG;            /* globals struct:  always passed */
    ZCONST char *prompt;  /* "--More--" prompt */
    int flag;             /* 0 = any char OK; 1 = accept only '\n', ' ', q */
{
    uch c;

/*---------------------------------------------------------------------------
    Print a prompt and wait for the user to press a key, then erase prompt
    if possible.
  ---------------------------------------------------------------------------*/

    if (!((Uz_Globs *)pG)->sol)
        fprintf(stderr, "\n");
    /* numlines may or may not be used: */
    fprintf(stderr, prompt, ((Uz_Globs *)pG)->numlines);
    fflush(stderr);
    if (flag & 1) {
        do {
            c = (uch)FGETCH(0);
        } while (c != '\r' && c != '\n' && c != ' ' && c != 'q' && c != 'Q');
    } else
        c = (uch)FGETCH(0);

    /* newline was not echoed, so cover up prompt line */
    fprintf(stderr, LoadFarString(HidePrompt));
    fflush(stderr);

    if (ToLower(c) == 'q') {
        DESTROYGLOBALS()
        EXIT(PK_COOL);
    }

    ((Uz_Globs *)pG)->sol = TRUE;

} /* end function UzpMorePause() */

#endif /* !WINDLL && !MACOS */




#ifndef WINDLL

/**************************/
/* Function UzpPassword() */
/**************************/

int UZ_EXP UzpPassword (pG, rcnt, pwbuf, size, zfn, efn)
    zvoid *pG;         /* pointer to UnZip's internal global vars */
    int *rcnt;         /* retry counter */
    char *pwbuf;       /* buffer for password */
    int size;          /* size of password buffer */
    ZCONST char *zfn;  /* name of zip archive */
    ZCONST char *efn;  /* name of archive entry being processed */
{
#if CRYPT
    int r = IZ_PW_ENTERED;
    char *m;
    char *prompt;

#ifndef REENTRANT
    /* tell picky compilers to shut up about "unused variable" warnings */
    pG = pG;
#endif

    if (*rcnt == 0) {           /* First call for current entry */
        *rcnt = 2;
        if ((prompt = (char *)malloc(2*FILNAMSIZ + 15)) != (char *)NULL) {
            sprintf(prompt, LoadFarString(PasswPrompt),
                    FnFilter1(zfn), FnFilter2(efn));
            m = prompt;
        } else
            m = (char *)LoadFarString(PasswPrompt2);
    } else {                    /* Retry call, previous password was wrong */
        (*rcnt)--;
        prompt = NULL;
        m = (char *)LoadFarString(PasswRetry);
    }

    m = getp(__G__ m, pwbuf, size);
    if (prompt != (char *)NULL) {
        free(prompt);
    }
    if (m == (char *)NULL) {
        r = IZ_PW_ERROR;
    }
    else if (*pwbuf == '\0') {
        r = IZ_PW_CANCELALL;
    }
    return r;

#else /* !CRYPT */
    /* tell picky compilers to shut up about "unused variable" warnings */
    pG = pG; rcnt = rcnt; pwbuf = pwbuf; size = size; zfn = zfn; efn = efn;

    return IZ_PW_ERROR;  /* internal error; function should never get called */
#endif /* ?CRYPT */

} /* end function UzpPassword() */





/**********************/
/* Function handler() */
/**********************/

void handler(signal)   /* upon interrupt, turn on echo and exit cleanly */
    int signal;
{
    GETGLOBALS();

#if !(defined(SIGBUS) || defined(SIGSEGV))      /* add a newline if not at */
    (*G.message)((zvoid *)&G, slide, 0L, 0x41); /*  start of line (to stderr; */
#endif                                          /*  slide[] should be safe) */

    echon();

#ifdef SIGBUS
    if (signal == SIGBUS) {
        Info(slide, 0x421, ((char *)slide, LoadFarString(ZipfileCorrupt),
          "bus error"));
        DESTROYGLOBALS()
        EXIT(PK_BADERR);
    }
#endif /* SIGBUS */

#ifdef SIGSEGV
    if (signal == SIGSEGV) {
        Info(slide, 0x421, ((char *)slide, LoadFarString(ZipfileCorrupt),
          "segmentation violation"));
        DESTROYGLOBALS()
        EXIT(PK_BADERR);
    }
#endif /* SIGSEGV */

    /* probably ctrl-C */
    DESTROYGLOBALS()
#if defined(AMIGA) && defined(__SASC)
    _abort();
#endif
    EXIT(IZ_CTRLC);       /* was EXIT(0), then EXIT(PK_ERR) */
}

#endif /* !WINDLL */




#if (!defined(VMS) && !defined(CMS_MVS))
#if (!defined(OS2) || defined(TIMESTAMP))

#if (!defined(HAVE_MKTIME) || defined(AMIGA) || defined(WIN32))
/* also used in amiga/filedate.c and win32/win32.c */
ZCONST ush ydays[] =
    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
#endif

/*******************************/
/* Function dos_to_unix_time() */ /* used for freshening/updating/timestamps */
/*******************************/

time_t dos_to_unix_time(dosdatetime)
    ulg dosdatetime;
{
    time_t m_time;

#ifdef HAVE_MKTIME

    ZCONST time_t now = time(NULL);
    struct tm *tm;
#   define YRBASE  1900

    tm = localtime(&now);
    tm->tm_isdst = -1;          /* let mktime determine if DST is in effect */

    /* dissect date */
    tm->tm_year = ((int)(dosdatetime >> 25) & 0x7f) + (1980 - YRBASE);
    tm->tm_mon  = ((int)(dosdatetime >> 21) & 0x0f) - 1;
    tm->tm_mday = ((int)(dosdatetime >> 16) & 0x1f);

    /* dissect time */
    tm->tm_hour = (int)((unsigned)dosdatetime >> 11) & 0x1f;
    tm->tm_min  = (int)((unsigned)dosdatetime >> 5) & 0x3f;
    tm->tm_sec  = (int)((unsigned)dosdatetime << 1) & 0x3e;

    m_time = mktime(tm);
    NATIVE_TO_TIMET(m_time)     /* NOP unless MSC 7.0 or Macintosh */
    TTrace((stderr, "  final m_time  =       %lu\n", (ulg)m_time));

#else /* !HAVE_MKTIME */

    int yr, mo, dy, hh, mm, ss;
#ifdef TOPS20
#   define YRBASE  1900
    struct tmx *tmx;
    char temp[20];
#else /* !TOPS20 */
#   define YRBASE  1970
    int leap;
    unsigned days;
    struct tm *tm;
#if (!defined(MACOS) && !defined(RISCOS) && !defined(QDOS) && !defined(TANDEM))
#ifdef WIN32
    TIME_ZONE_INFORMATION tzinfo;
    DWORD res;
#else /* ! WIN32 */
#ifndef BSD4_4   /* GRR:  change to !defined(MODERN) ? */
#if (defined(BSD) || defined(MTS) || defined(__GO32__))
    struct timeb tbp;
#else /* !(BSD || MTS || __GO32__) */
#ifdef DECLARE_TIMEZONE
    extern time_t timezone;
#endif
#endif /* ?(BSD || MTS || __GO32__) */
#endif /* !BSD4_4 */
#endif /* ?WIN32 */
#endif /* !MACOS && !RISCOS && !QDOS && !TANDEM */
#endif /* ?TOPS20 */


    /* dissect date */
    yr = ((int)(dosdatetime >> 25) & 0x7f) + (1980 - YRBASE);
    mo = ((int)(dosdatetime >> 21) & 0x0f) - 1;
    dy = ((int)(dosdatetime >> 16) & 0x1f) - 1;

    /* dissect time */
    hh = (int)((unsigned)dosdatetime >> 11) & 0x1f;
    mm = (int)((unsigned)dosdatetime >> 5) & 0x3f;
    ss = (int)((unsigned)dosdatetime & 0x1f) * 2;

#ifdef TOPS20
    tmx = (struct tmx *)malloc(sizeof(struct tmx));
    sprintf (temp, "%02d/%02d/%02d %02d:%02d:%02d", mo+1, dy+1, yr, hh, mm, ss);
    time_parse(temp, tmx, (char *)0);
    m_time = time_make(tmx);
    free(tmx);

#else /* !TOPS20 */

/*---------------------------------------------------------------------------
    Calculate the number of seconds since the epoch, usually 1 January 1970.
  ---------------------------------------------------------------------------*/

    /* leap = # of leap yrs from YRBASE up to but not including current year */
    leap = ((yr + YRBASE - 1) / 4);   /* leap year base factor */

    /* calculate days from BASE to this year and add expired days this year */
    days = (yr * 365) + (leap - 492) + ydays[mo];

    /* if year is a leap year and month is after February, add another day */
    if ((mo > 1) && ((yr+YRBASE)%4 == 0) && ((yr+YRBASE) != 2100))
        ++days;                 /* OK through 2199 */

    /* convert date & time to seconds relative to 00:00:00, 01/01/YRBASE */
    m_time = (time_t)((unsigned long)(days + dy) * 86400L +
                      (unsigned long)hh * 3600L +
                      (unsigned long)(mm * 60 + ss));
      /* - 1;   MS-DOS times always rounded up to nearest even second */
    TTrace((stderr, "dos_to_unix_time:\n"));
    TTrace((stderr, "  m_time before timezone = %lu\n", (ulg)m_time));

/*---------------------------------------------------------------------------
    Adjust for local standard timezone offset.
  ---------------------------------------------------------------------------*/

#if (!defined(MACOS) && !defined(RISCOS) && !defined(QDOS) && !defined(TANDEM))
#ifdef WIN32
    /* account for timezone differences */
    res = GetTimeZoneInformation(&tzinfo);
    if (res != TIME_ZONE_ID_UNKNOWN)
    {
    m_time += 60*(tzinfo.Bias);
#else /* !WIN32 */
#if (defined(BSD) || defined(MTS) || defined(__GO32__))
#ifdef BSD4_4
    if ( (dosdatetime >= DOSTIME_2038_01_18) &&
         (m_time < (time_t)0x70000000L) )
        m_time = U_TIME_T_MAX;  /* saturate in case of (unsigned) overflow */
    if (m_time < (time_t)0L)    /* a converted DOS time cannot be negative */
        m_time = S_TIME_T_MAX;  /*  -> saturate at max signed time_t value */
    if ((tm = localtime(&m_time)) != (struct tm *)NULL)
        m_time -= tm->tm_gmtoff;                /* sec. EAST of GMT: subtr. */
#else /* !(BSD4_4 */
    ftime(&tbp);                                /* get `timezone' */
    m_time += tbp.timezone * 60L;               /* seconds WEST of GMT:  add */
#endif /* ?(BSD4_4 || __EMX__) */
#else /* !(BSD || MTS || __GO32__) */
    /* tzset was already called at start of process_zipfiles() */
    /* tzset(); */              /* set `timezone' variable */
#ifndef __BEOS__                /* BeOS DR8 has no timezones... */
    m_time += timezone;         /* seconds WEST of GMT:  add */
#endif
#endif /* ?(BSD || MTS || __GO32__) */
#endif /* ?WIN32 */
    TTrace((stderr, "  m_time after timezone =  %lu\n", (ulg)m_time));

/*---------------------------------------------------------------------------
    Adjust for local daylight savings (summer) time.
  ---------------------------------------------------------------------------*/

#ifndef BSD4_4  /* (DST already added to tm_gmtoff, so skip tm_isdst) */
    if ( (dosdatetime >= DOSTIME_2038_01_18) &&
         (m_time < (time_t)0x70000000L) )
        m_time = U_TIME_T_MAX;  /* saturate in case of (unsigned) overflow */
    if (m_time < (time_t)0L)    /* a converted DOS time cannot be negative */
        m_time = S_TIME_T_MAX;  /*  -> saturate at max signed time_t value */
    TIMET_TO_NATIVE(m_time)     /* NOP unless MSC 7.0 or Macintosh */
    if (((tm = localtime((time_t *)&m_time)) != NULL) && tm->tm_isdst)
#ifdef WIN32
        m_time += 60L * tzinfo.DaylightBias;    /* adjust with DST bias */
    else
        m_time += 60L * tzinfo.StandardBias;    /* add StdBias (normally 0) */
#else
        m_time -= 60L * 60L;    /* adjust for daylight savings time */
#endif
    NATIVE_TO_TIMET(m_time)     /* NOP unless MSC 7.0 or Macintosh */
    TTrace((stderr, "  m_time after DST =       %lu\n", (ulg)m_time));