filedate.c

完整的解压zip文件的源码。包含密码功能

/* Low-level Amiga routines shared between Zip and UnZip.
 *
 * Contains:  FileDate()
 *            locale_TZ()
 *            getenv()          [Aztec C only; replaces bad C library versions]
 *            setenv()          [ditto]
 *            tzset()           [ditto]
 *            gmtime()          [ditto]
 *            localtime()       [ditto]
 *            time()            [ditto]
 *            sendpkt()
 *            Agetch()
 *
 * The first nine are used by all Info-ZIP programs except fUnZip.
 * The last two are used by all except the non-CRYPT version of fUnZip.
 * Probably some of the stuff in here is unused by ZipNote and ZipSplit too...
 * sendpkt() is used by Agetch() and FileDate(), and by windowheight() in
 * amiga/amiga.c (UnZip).  time() is used only by Zip.
 */


/* HISTORY/CHANGES
 *  2 Sep 92, Greg Roelofs, Original coding.
 *  6 Sep 92, John Bush, Incorporated into UnZip 5.1
 *  6 Sep 92, John Bush, Interlude "FileDate()" defined, which calls or
 *            redefines SetFileDate() depending upon AMIGADOS2 definition.
 * 11 Oct 92, John Bush, Eliminated AMIGADOS2 switch by determining
 *            revision via OpenLibrary() call.  Now only one version of
 *            the program runs on both platforms (1.3.x vs. 2.x)
 * 11 Oct 92, John Bush, Merged with Zip version and changed arg passing
 *            to take time_t input instead of struct DateStamp.
 *            Arg passing made to conform with utime().
 * 22 Nov 92, Paul Kienitz, fixed includes for Aztec and cleaned up some
 *            lint-ish errors; simplified test for AmigaDOS version.
 * 11 Nov 95, Paul Kienitz, added Agetch() for crypt password input and
 *            UnZip's "More" prompt -- simplifies crypt.h and avoids
 *            use of library code redundant with sendpkt().  Made it
 *            available to fUnZip, which does not use FileDate().
 * 22 Nov 95, Paul Kienitz, created a new tzset() that gets the current
 *            timezone from the Locale preferences.  These exist only under
 *            AmigaDOS 2.1 and up, but it is probably correctly set on more
 *            Amigas than the TZ environment variable is.  We check that
 *            only if TZ is not validly set.  We do not parse daylight
 *            savings syntax except to check for presence vs. absence of a
 *            DST part; United States rules are assumed.  This is better
 *            than the tzset()s in the Amiga compilers' libraries do.
 * 15 Jan 96, Chr. Spieler, corrected the logic when to select low level
 *            sendpkt() (when FileDate(), Agetch() or windowheight() is used),
 *            and AMIGA's Agetch() (CRYPT, and UnZip(SFX)'s UzpMorePause()).
 * 10 Feb 96, Paul Kienitz, re-fiddled that selection logic again, moved
 *            stuff around for clarity.
 * 16 Mar 96, Paul Kienitz, created a replacement localtime() to go with the
 *            new tzset(), because Aztec's is hopelessly broken.  Also
 *            gmtime(), which localtime() calls.
 * 12 Apr 96, Paul Kienitz, daylight savings was being handled incorrectly.
 * 21 Apr 96, Paul Kienitz, had to replace time() as well, Aztec's returns
 *            local time instead of GMT.  That's why their localtime() was bad,
 *            because it assumed time_t was already local, and gmtime() was
 *            the one that checked TZ.
 * 23 Apr 96, Chr. Spieler, deactivated time() replacement for UnZip stuff.
 *            Currently, the UnZip sources do not make use of time() (and do
 *            not supply the working mktime() replacement, either!).
 * 29 Apr 96, Paul Kienitz, created a replacement getenv() out of code that
 *            was previously embedded in tzset(), for reliable global test
 *            of whether TZ is set or not.
 * 19 Jun 96, Haidinger Walter, re-adapted for current SAS/C compiler.
 *  7 Jul 96, Paul Kienitz, smoothed together compiler-related changes.
 *  4 Feb 97, Haidinger Walter, added set_TZ() for SAS/C.
 * 23 Apr 97, Paul Kienitz, corrected Unix->Amiga DST error by adding
 *            mkgmtime() so localtime() could be used.
 * 28 Apr 97, Christian Spieler, deactivated mkgmtime() definition for ZIP;
 *            the Zip sources supply this function as part of util.c.
 * 24 May 97, Haidinger Walter, added time_lib support for SAS/C and moved
 *            set_TZ() to time_lib.c.
 * 12 Jul 97, Paul Kienitz, adapted time_lib stuff for Aztec.
 * 26 Jul 97, Chr. Spieler, old mkgmtime() fixed (ydays[] def, sign vs unsign).
 * 30 Dec 97, Haidinger Walter, adaptation for SAS/C using z-stat.h functions.
 * 19 Feb 98, Haidinger Walter, removed alloc_remember, more SAS.C fixes.
 * 23 Apr 98, Chr. Spieler, removed mkgmtime(), changed FileDate to convert to
 *            Amiga file-time directly.
 * 24 Apr 98, Paul Kienitz, clip Unix dates earlier than 1978 in FileDate().
 * 02 Sep 98, Paul Kienitz, C. Spieler, always include zip.h to get a defined
 *            header inclusion sequence that resolves all header dependencies.
 */

#ifndef __amiga_filedate_c
#define __amiga_filedate_c


#include "zip.h"
#include <ctype.h>
#include <errno.h>

#include <exec/types.h>
#include <exec/execbase.h>
#include <exec/memory.h>

#ifdef AZTEC_C
#  include <libraries/dos.h>
#  include <libraries/dosextens.h>
#  include <clib/exec_protos.h>
#  include <clib/dos_protos.h>
#  include <clib/locale_protos.h>
#  include <pragmas/exec_lib.h>
#  include <pragmas/dos_lib.h>
#  include <pragmas/locale_lib.h>
#  define ESRCH  ENOENT
#  define EOSERR EIO
#endif

#ifdef __SASC
#  include <stdlib.h>
#  if (defined(_M68020) && (!defined(__USE_SYSBASE)))
                            /* on 68020 or higher processors it is faster   */
#    define __USE_SYSBASE   /* to use the pragma libcall instead of syscall */
#  endif                    /* to access functions of the exec.library      */
#  include <proto/exec.h>   /* see SAS/C manual:part 2,chapter 2,pages 6-7  */
#  include <proto/dos.h>
#  include <proto/locale.h>
#  ifdef DEBUG
#     include <sprof.h>
#  endif
#  ifdef MWDEBUG
#    include <stdio.h>      /* include both before memwatch.h again just */
#    include <stdlib.h>     /* to be safe */
#    include "memwatch.h"
#  endif /* MWDEBUG */
#endif /* __SASC */

#include "crypt.h"            /* just so we can tell if CRYPT is supported */



#ifndef FUNZIP

#ifndef SUCCESS
#  define SUCCESS (-1L)
#  define FAILURE 0L
#endif

#define ReqVers 36L        /* required library version for SetFileDate() */
#define ENVSIZE 100        /* max space allowed for an environment var   */

extern struct ExecBase *SysBase;

#ifndef USE_TIME_LIB
#ifdef AZTEC_C                  /* should be pretty safe for reentrancy */
   long timezone = 0;           /* already declared SAS/C external */
   int daylight = 0;            /* likewise */
#endif
int real_timezone_is_set = FALSE;       /* set by tzset() */
#endif /* !USE_TIME_LIB */

/* prototypes */
char *getenv(const char *var);
#ifdef __SASC
int setenv(const char *var, const char *value, int overwrite);
/*  !!!!  We have really got to find a way to operate without this. */
#endif

LONG FileDate (char *filename, time_t u[]);
LONG sendpkt(struct MsgPort *pid, LONG action, LONG *args, LONG nargs);
int Agetch(void);

/* prototypes for time replacement functions */
#ifndef USE_TIME_LIB
  void tzset(void);
  int locale_TZ(void);
  struct tm *gmtime(const time_t *when);
  struct tm *localtime(const time_t *when);
#  ifdef __SASC
     extern void set_TZ(long time_zone, int day_light);  /* in time_lib.c */
#  endif
#  ifdef ZIP
     time_t time(time_t *tp);
#  endif
#endif /* !USE_TIME_LIB */

/* =============================================================== */

/***********************/
/* Function filedate() */
/***********************/

/*  FileDate() (originally utime.c), by Paul Wells.  Modified by John Bush
 *  and others (see also sendpkt() comments, below); NewtWare SetFileDate()
 *  clone cheaply ripped off from utime().
 */

/* DESCRIPTION
 * This routine chooses between 2 methods to set the file date on AMIGA.
 * Since AmigaDOS 2.x came out, SetFileDate() was available in ROM (v.36
 * and higher).  Under AmigaDOS 1.3.x (less than v.36 ROM), SetFileDate()
 * must be accomplished by constructing a message packet and sending it
 * to the file system handler of the file to be stamped.
 *
 * The system's ROM version is extracted from the external system Library
 * base.
 *
 * NOTE:  although argument passing conforms with utime(), note the
 *        following differences:
 *          - Return value is boolean success/failure.
 *          - If a structure or array is passed, only the first value
 *            is used, which *may* correspond to date accessed and not
 *            date modified.
 */

/* Nonzero if `y' is a leap year, else zero. */
#define leap(y) (((y) % 4 == 0 && (y) % 100 != 0) || (y) % 400 == 0)

/* Number of leap years from 1970 to `y' (not including `y' itself). */
#define nleap(y) (((y) - 1969) / 4 - ((y) - 1901) / 100 + ((y) - 1601) / 400)

/* Accumulated number of days from 01-Jan up to start of current month. */
#ifdef ZIP
static const unsigned short ydays[] =
{  0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
#else
extern const unsigned short ydays[];  /* in unzip's fileio.c */
#endif

LONG FileDate(filename, u)
    char *filename;
    time_t u[];
{
    LONG SetFileDate(UBYTE *filename, struct DateStamp *pDate);
    LONG sendpkt(struct MsgPort *pid, LONG action, LONG *args, LONG nargs);
    struct MsgPort *taskport;
    BPTR dirlock, lock;
    struct FileInfoBlock *fib;
    LONG pktargs[4];
    UBYTE *ptr;
    long ret;

    struct DateStamp pDate;
    struct tm *ltm;
    int years;

    /* tzset(); */
    /* Amiga file date is based on 01-Jan-1978 00:00:00 (local time):
     * 8 years and 2 leapdays difference from Unix time.
     */
    ltm = localtime(&u[0]);
    years = ltm->tm_year + 1900;
    if (years < 1978)
        pDate.ds_Days = pDate.ds_Minute = pDate.ds_Tick = 0;
    else {
        pDate.ds_Days = (years - 1978) * 365L + (nleap(years) - 2) +
                        ((ltm->tm_mon > 1 && leap(years)) ? 1 : 0) +
                        ydays[ltm->tm_mon] + (ltm->tm_mday - 1);
        pDate.ds_Minute = ltm->tm_hour * 60 + ltm->tm_min;
        pDate.ds_Tick = ltm->tm_sec * TICKS_PER_SECOND;
    }

    if (SysBase->LibNode.lib_Version >= ReqVers)
    {
        return (SetFileDate(filename,&pDate));  /* native routine at 2.0+ */
    }
    else  /* !(SysBase->lib_Version >=ReqVers) */
    {
        if( !(taskport = (struct MsgPort *)DeviceProc(filename)) )
        {
            errno = ESRCH;          /* no such process */
            return FAILURE;
        }

        if( !(lock = Lock(filename,SHARED_LOCK)) )
        {
            errno = ENOENT;         /* no such file */
            return FAILURE;
        }

        if( !(fib = (struct FileInfoBlock *)AllocMem(
            (long)sizeof(struct FileInfoBlock),MEMF_PUBLIC|MEMF_CLEAR)) )
        {
            errno = ENOMEM;         /* insufficient memory */
            UnLock(lock);
            return FAILURE;
        }

        if( Examine(lock,fib)==FAILURE )
        {
            errno = EOSERR;         /* operating system error */
            UnLock(lock);
            FreeMem(fib,(long)sizeof(*fib));
            return FAILURE;
        }

        dirlock = ParentDir(lock);
        ptr = (UBYTE *)AllocMem(64L,MEMF_PUBLIC);
        strcpy((ptr+1),fib->fib_FileName);
        *ptr = strlen(fib->fib_FileName);
        FreeMem(fib,(long)sizeof(*fib));
        UnLock(lock);

        /* now fill in argument array */

        pktargs[0] = 0;
        pktargs[1] = (LONG)dirlock;
        pktargs[2] = (LONG)&ptr[0] >> 2;
        pktargs[3] = (LONG)&pDate;

        errno = ret = sendpkt(taskport,ACTION_SET_DATE,pktargs,4L);

        FreeMem(ptr,64L);
        UnLock(dirlock);

        return SUCCESS;
    }  /* ?(SysBase->lib_Version >= ReqVers) */
} /* FileDate() */


char *getenv(const char *var)         /* not reentrant! */
{
    static char space[ENVSIZE];