static int do_seekable(__G__ lastchance)        /* return PK-type error code */
    __GDEF
    int lastchance;
{
#ifndef SFX
    /* static int no_ecrec = FALSE;  SKM: moved to globals.h */
    int maybe_exe=FALSE;
    int too_weird_to_continue=FALSE;
#ifdef TIMESTAMP
    time_t uxstamp;
    ulg nmember = 0L;
#endif
#endif
    int error=0, error_in_archive;


/*---------------------------------------------------------------------------
    Open the zipfile for reading in BINARY mode to prevent CR/LF translation,
    which would corrupt the bit streams.
  ---------------------------------------------------------------------------*/

    if (SSTAT(G.zipfn, &G.statbuf) ||
#ifdef THEOS
        (error = S_ISLIB(G.statbuf.st_mode)) != 0 ||
#endif
        (error = S_ISDIR(G.statbuf.st_mode)) != 0)
    {
#ifndef SFX
        if (lastchance && (uO.qflag < 3)) {
#if defined(UNIX) || defined(QDOS)
            if (G.no_ecrec)
                Info(slide, 1, ((char *)slide,
                  LoadFarString(CannotFindZipfileDirMsg),
                  LoadFarStringSmall((uO.zipinfo_mode ? Zipnfo : Unzip)),
                  G.wildzipfn, uO.zipinfo_mode? "  " : "", G.wildzipfn,
                  G.zipfn));
            else
                Info(slide, 1, ((char *)slide,
                  LoadFarString(CannotFindEitherZipfile),
                  LoadFarStringSmall((uO.zipinfo_mode ? Zipnfo : Unzip)),
                  G.wildzipfn, G.wildzipfn, G.zipfn));
#else /* !(UNIX || QDOS) */
            if (G.no_ecrec)
                Info(slide, 0x401, ((char *)slide,
                  LoadFarString(CannotFindZipfileDirMsg),
                  LoadFarStringSmall((uO.zipinfo_mode ? Zipnfo : Unzip)),
                  G.wildzipfn, uO.zipinfo_mode? "  " : "", G.zipfn));
            else
#ifdef VMS
                Info(slide, 0x401, ((char *)slide,
                  LoadFarString(CannotFindEitherZipfile),
                  LoadFarStringSmall((uO.zipinfo_mode ? Zipnfo : Unzip)),
                  G.wildzipfn,
                  (*G.zipfn ? G.zipfn : vms_msg_text())));
#else /* !VMS */
                Info(slide, 0x401, ((char *)slide,
                  LoadFarString(CannotFindEitherZipfile),
                  LoadFarStringSmall((uO.zipinfo_mode ? Zipnfo : Unzip)),
                  G.wildzipfn, G.zipfn));
#endif /* ?VMS */
#endif /* ?(UNIX || QDOS) */
        }
#endif /* !SFX */
        return error? IZ_DIR : PK_NOZIP;
    }
    G.ziplen = G.statbuf.st_size;

#ifndef SFX
#if defined(UNIX) || defined(DOS_OS2_W32) || defined(THEOS)
    if (G.statbuf.st_mode & S_IEXEC)   /* no extension on Unix exes:  might */
        maybe_exe = TRUE;               /*  find unzip, not unzip.zip; etc. */
#endif
#endif /* !SFX */

#ifdef VMS
    if (check_format(__G))              /* check for variable-length format */
        return PK_ERR;
#endif

    if (open_input_file(__G))   /* this should never happen, given */
        return PK_NOZIP;        /*  the stat() test above, but... */

#ifdef DO_SAFECHECK_2GB
    /* Need more care: Do not trust the size returned by stat() but
       determine it by reading beyond the end of the file. */
    G.ziplen = file_size(G.zipfd);

    if (G.ziplen == EOF) {
        Info(slide, 0x401, ((char *)slide, LoadFarString(ZipfileTooBig)));
        /*
        printf(
" We need a better error message for: 64-bit file, 32-bit program.\n");
        */
        CLOSE_INFILE();
        return IZ_ERRBF;
    }
#endif /* DO_SAFECHECK_2GB */

/*---------------------------------------------------------------------------
    Find and process the end-of-central-directory header.  UnZip need only
    check last 65557 bytes of zipfile:  comment may be up to 65535, end-of-
    central-directory record is 18 bytes, and signature itself is 4 bytes;
    add some to allow for appended garbage.  Since ZipInfo is often used as
    a debugging tool, search the whole zipfile if zipinfo_mode is true.
  ---------------------------------------------------------------------------*/

    G.cur_zipfile_bufstart = 0;
    G.inptr = G.inbuf;

#if ((!defined(WINDLL) && !defined(SFX)) || !defined(NO_ZIPINFO))
# if (!defined(WINDLL) && !defined(SFX))
    if ( (!uO.zipinfo_mode && !uO.qflag
#  ifdef TIMESTAMP
          && !uO.T_flag
#  endif
         )
#  ifndef NO_ZIPINFO
         || (uO.zipinfo_mode && uO.hflag)
#  endif
       )
# else /* not (!WINDLL && !SFX) ==> !NO_ZIPINFO !! */
    if (uO.zipinfo_mode && uO.hflag)
# endif /* if..else..: (!WINDLL && !SFX) */
# ifdef WIN32   /* Win32 console may require codepage conversion for G.zipfn */
        Info(slide, 0, ((char *)slide, LoadFarString(LogInitline),
          FnFilter1(G.zipfn)));
# else
        Info(slide, 0, ((char *)slide, LoadFarString(LogInitline), G.zipfn));
# endif
#endif /* (!WINDLL && !SFX) || !NO_ZIPINFO */

    if ( (error_in_archive = find_ecrec(__G__
#ifndef NO_ZIPINFO
                                        uO.zipinfo_mode ? G.ziplen :
#endif
                                        MIN(G.ziplen, 66000L)))
         > PK_WARN )
    {
        CLOSE_INFILE();

#ifdef SFX
        ++lastchance;   /* avoid picky compiler warnings */
        return error_in_archive;
#else
        if (maybe_exe)
            Info(slide, 0x401, ((char *)slide, LoadFarString(MaybeExe),
            G.zipfn));
        if (lastchance)
            return error_in_archive;
        else {
            G.no_ecrec = TRUE;    /* assume we found wrong file:  e.g., */
            return PK_NOZIP;       /*  unzip instead of unzip.zip */
        }
#endif /* ?SFX */
    }

    if ((uO.zflag > 0) && !uO.zipinfo_mode) { /* unzip: zflag = comment ONLY */
        CLOSE_INFILE();
        return error_in_archive;
    }

/*---------------------------------------------------------------------------
    Test the end-of-central-directory info for incompatibilities (multi-disk
    archives) or inconsistencies (missing or extra bytes in zipfile).
  ---------------------------------------------------------------------------*/

#ifdef NO_MULTIPART
    error = !uO.zipinfo_mode && (G.ecrec.number_this_disk == 1) &&
            (G.ecrec.num_disk_start_cdir == 1);
#else
    error = !uO.zipinfo_mode && (G.ecrec.number_this_disk != 0);
#endif

#ifndef SFX
    if (uO.zipinfo_mode &&
        G.ecrec.number_this_disk != G.ecrec.num_disk_start_cdir)
    {
        if (G.ecrec.number_this_disk > G.ecrec.num_disk_start_cdir) {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(CentDirNotInZipMsg), G.zipfn,
              (ulg)G.ecrec.number_this_disk,
              (ulg)G.ecrec.num_disk_start_cdir));
            error_in_archive = PK_FIND;
            too_weird_to_continue = TRUE;
        } else {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(EndCentDirBogus), G.zipfn,
              (ulg)G.ecrec.number_this_disk,
              (ulg)G.ecrec.num_disk_start_cdir));
            error_in_archive = PK_WARN;
        }
#ifdef NO_MULTIPART   /* concatenation of multiple parts works in some cases */
    } else if (!uO.zipinfo_mode && !error && G.ecrec.number_this_disk != 0) {
        Info(slide, 0x401, ((char *)slide, LoadFarString(NoMultiDiskArcSupport),
          G.zipfn));
        error_in_archive = PK_FIND;
        too_weird_to_continue = TRUE;
#endif
    }

    if (!too_weird_to_continue) {  /* (relatively) normal zipfile:  go for it */
        if (error) {
            Info(slide, 0x401, ((char *)slide, LoadFarString(MaybePakBug),
              G.zipfn));
            error_in_archive = PK_WARN;
        }
#endif /* !SFX */
        if ((G.extra_bytes = G.real_ecrec_offset-G.expect_ecrec_offset) <
            (zoff_t)0)
        {
            Info(slide, 0x401, ((char *)slide, LoadFarString(MissingBytes),
              G.zipfn, FmZofft((-G.extra_bytes), NULL, NULL)));
            error_in_archive = PK_ERR;
        } else if (G.extra_bytes > 0) {
            if ((G.ecrec.offset_start_central_directory == 0) &&
                (G.ecrec.size_central_directory != 0))   /* zip 1.5 -go bug */
            {
                Info(slide, 0x401, ((char *)slide,
                  LoadFarString(NullCentDirOffset), G.zipfn));
                G.ecrec.offset_start_central_directory = G.extra_bytes;
                G.extra_bytes = 0;
                error_in_archive = PK_ERR;
            }
#ifndef SFX
            else {
                Info(slide, 0x401, ((char *)slide,
                  LoadFarString(ExtraBytesAtStart), G.zipfn,
                  FmZofft(G.extra_bytes, NULL, NULL),
                  (G.extra_bytes == 1)? "":"s"));
                error_in_archive = PK_WARN;
            }
#endif /* !SFX */
        }

    /*-----------------------------------------------------------------------
        Check for empty zipfile and exit now if so.
      -----------------------------------------------------------------------*/

        if (G.expect_ecrec_offset==0L && G.ecrec.size_central_directory==0) {
            if (uO.zipinfo_mode)
                Info(slide, 0, ((char *)slide, "%sEmpty zipfile.\n",
                  uO.lflag>9? "\n  " : ""));
            else
                Info(slide, 0x401, ((char *)slide, LoadFarString(ZipfileEmpty),
                                    G.zipfn));
            CLOSE_INFILE();
            return (error_in_archive > PK_WARN)? error_in_archive : PK_WARN;
        }

    /*-----------------------------------------------------------------------
        Compensate for missing or extra bytes, and seek to where the start
        of central directory should be.  If header not found, uncompensate
        and try again (necessary for at least some Atari archives created
        with STZip, as well as archives created by J.H. Holm's ZIPSPLIT 1.1).
      -----------------------------------------------------------------------*/

        error = seek_zipf(__G__ G.ecrec.offset_start_central_directory);
        if (error == PK_BADERR) {
            CLOSE_INFILE();
            return PK_BADERR;
        }
#ifdef OLD_SEEK_TEST
        if (error != PK_OK || readbuf(__G__ G.sig, 4) == 0) {
            CLOSE_INFILE();
            return PK_ERR;  /* file may be locked, or possibly disk error(?) */
        }
        if (memcmp(G.sig, central_hdr_sig, 4))
#else
        if ((error != PK_OK) || (readbuf(__G__ G.sig, 4) == 0) ||
            memcmp(G.sig, central_hdr_sig, 4))
#endif
        {
#ifndef SFX
            zoff_t tmp = G.extra_bytes;
#endif

            G.extra_bytes = 0;
            error = seek_zipf(__G__ G.ecrec.offset_start_central_directory);
            if ((error != PK_OK) || (readbuf(__G__ G.sig, 4) == 0) ||
                memcmp(G.sig, central_hdr_sig, 4))
            {
                if (error != PK_BADERR)
                  Info(slide, 0x401, ((char *)slide,
                    LoadFarString(CentDirStartNotFound), G.zipfn,
                    LoadFarStringSmall(ReportMsg)));
                CLOSE_INFILE();
                return (error != PK_OK ? error : PK_BADERR);
            }
#ifndef SFX
            Info(slide, 0x401, ((char *)slide, LoadFarString(CentDirTooLong),
              G.zipfn, FmZofft((-tmp), NULL, NULL)));
#endif
            error_in_archive = PK_ERR;
        }

    /*-----------------------------------------------------------------------
        Seek to the start of the central directory one last time, since we
        have just read the first entry's signature bytes; then list, extract
        or test member files as instructed, and close the zipfile.
      -----------------------------------------------------------------------*/

        error = seek_zipf(__G__ G.ecrec.offset_start_central_directory);
        if (error != PK_OK) {
            CLOSE_INFILE();
            return error;
        }

        Trace((stderr, "about to extract/list files (error = %d)\n",
          error_in_archive));

#ifdef DLL
        /* G.fValidate is used only to look at an archive to see if
           it appears to be a valid archive.  There is no interest
           in what the archive contains, nor in validating that the
           entries in the archive are in good condition.  This is
           currently used only in the Windows DLLs for purposes of
           checking archives within an archive to determine whether
           or not to display the inner archives.
         */
        if (!G.fValidate)
#endif
        {
#ifndef NO_ZIPINFO
            if (uO.zipinfo_mode)
                error = zipinfo(__G);                 /* ZIPINFO 'EM */
            else
#endif
#ifndef SFX
#ifdef TIMESTAMP
            if (uO.T_flag)
                error = get_time_stamp(__G__ &uxstamp, &nmember);
            else
#endif
            if (uO.vflag && !uO.tflag && !uO.cflag)
                error = list_files(__G);              /* LIST 'EM */
            else
#endif /* !SFX */
                error = extract_or_test_files(__G);   /* EXTRACT OR TEST 'EM */

            Trace((stderr, "done with extract/list files (error = %d)\n",
                   error));
        }

        if (error > error_in_archive)   /* don't overwrite stronger error */
            error_in_archive = error;   /*  with (for example) a warning */
#ifndef SFX
    } /* end if (!too_weird_to_continue) */
#endif

    CLOSE_INFILE();

#ifdef TIMESTAMP
    if (uO.T_flag && !uO.zipinfo_mode && (nmember > 0L)) {
# ifdef WIN32
        if (stamp_file(__G__ G.zipfn, uxstamp)) {       /* TIME-STAMP 'EM */
# else
        if (stamp_file(G.zipfn, uxstamp)) {             /* TIME-STAMP 'EM */
# endif
            if (uO.qflag < 3)
                Info(slide, 0x201, ((char *)slide,
                  LoadFarString(ZipTimeStampFailed), G.zipfn));
            if (error_in_archive < PK_WARN)
                error_in_archive = PK_WARN;
        } else {
            if (!uO.qflag)
                Info(slide, 0, ((char *)slide,
                  LoadFarString(ZipTimeStampSuccess), G.zipfn));
        }
    }
#endif
    return error_in_archive;

} /* end function do_seekable() */




#ifdef DO_SAFECHECK_2GB
/************************/
/* Function file_size() */
/************************/
/* File size determination which does not mislead for large files in a
   small-file program.  Probably should be somewhere else.
   The file has to be opened previously
*/
#ifdef USE_STRM_INPUT
static zoff_t file_size(file)
    FILE *file;
{
    int sts;
    size_t siz;
#else /* !USE_STRM_INPUT */
static zoff_t file_size(fh)
    int fh;
{
    int siz;
#endif /* ?USE_STRM_INPUT */
    zoff_t ofs;
    char waste[4];

#ifdef USE_STRM_INPUT
    /* Seek to actual EOF. */
    sts = zfseeko(file, 0, SEEK_END);
    if (sts != 0) {
        /* fseeko() failed.  (Unlikely.) */
        ofs = EOF;
    } else {
        /* Get apparent offset at EOF. */
        ofs = zftello(file);
        if (ofs < 0) {
            /* Offset negative (overflow).  File too big. */
            ofs = EOF;
        } else {
            /* Seek to apparent EOF offset.
               Won't be at actual EOF if offset was truncated.
            */
            sts = zfseeko(file, ofs, SEEK_SET);
            if (sts != 0) {
                /* fseeko() failed.  (Unlikely.) */
                ofs = EOF;
            } else {
                /* Read a byte at apparent EOF.  Should set EOF flag. */
                siz = fread(waste, 1, 1, file);
                if (feof(file) == 0) {
                    /* Not at EOF, but should be.  File too big. */
                    ofs = EOF;
                }
            }
        }
    }
#else /* !USE_STRM_INPUT */
    /* Seek to actual EOF. */
    ofs = zlseek(fh, 0, SEEK_END);
    if (ofs == (zoff_t) -1) {
        /* zlseek() failed.  (Unlikely.) */
        ofs = EOF;
    } else if (ofs < 0) {
        /* Offset negative (overflow).  File too big. */
        ofs = EOF;
    } else {
        /* Seek to apparent EOF offset.
           Won't be at actual EOF if offset was truncated.
        */
        ofs = zlseek(fh, ofs, SEEK_SET);
        if (ofs == (zoff_t) -1) {
            /* zlseek() failed.  (Unlikely.) */
            ofs = EOF;
        } else {
            /* Read a byte at apparent EOF.  Should set EOF flag. */
            siz = read(fh, waste, 1);
            if (siz != 0) {
                /* Not at EOF, but should be.  File too big. */
                ofs = EOF;
            }
        }
    }
#endif /* ?USE_STRM_INPUT */
    return ofs;
} /* end function file_size() */
#endif /* DO_SAFECHECK_2GB */




/***********************/
/* Function rec_find() */
/***********************/

static int rec_find(__G__ searchlen, signature, rec_size)
    /* return 0 when rec found, 1 when not found, 2 in case of read error */
    __GDEF
    zoff_t searchlen;
    char* signature;
    int rec_size;
{
    int i, numblks, found=FALSE;
    zoff_t tail_len;

/*---------------------------------------------------------------------------
    Zipfile is longer than INBUFSIZ:  may need to loop.  Start with short
    block at end of zipfile (if not TOO short).
  ---------------------------------------------------------------------------*/

    if ((tail_len = G.ziplen % INBUFSIZ) > rec_size) {
#ifdef USE_STRM_INPUT
        zfseeko(G.zipfd, G.ziplen-tail_len, SEEK_SET);
        G.cur_zipfile_bufstart = zftello(G.zipfd);
#else /* !USE_STRM_INPUT */
        G.cur_zipfile_bufstart = zlseek(G.zipfd, G.ziplen-tail_len, SEEK_SET);
#endif /* ?USE_STRM_INPUT */
        if ((G.incnt = read(G.zipfd, (char *)G.inbuf,
            (unsigned int)tail_len)) != (int)tail_len)
            return 2;      /* it's expedient... */

        /* 'P' must be at least (rec_size+4) bytes from end of zipfile */
        for (G.inptr = G.inbuf+(int)tail_len-(rec_size+4);
             G.inptr >= G.inbuf;
             --G.inptr) {
            if ( (*G.inptr == (uch)0x50) &&         /* ASCII 'P' */
                 !memcmp((char *)G.inptr, signature, 4) ) {
                G.incnt -= (int)(G.inptr - G.inbuf);
                found = TRUE;
                break;
            }
        }
        /* sig may span block boundary: */
        memcpy((char *)G.hold, (char *)G.inbuf, 3);
    } else
        G.cur_zipfile_bufstart = G.ziplen - tail_len;

/*-----------------------------------------------------------------------
    Loop through blocks of zipfile data, starting at the end and going
    toward the beginning.  In general, need not check whole zipfile for
    signature, but may want to do so if testing.
  -----------------------------------------------------------------------*/

    numblks = (int)((searchlen - tail_len + (INBUFSIZ-1)) / INBUFSIZ);
    /*               ==amount=   ==done==   ==rounding==    =blksiz=  */

    for (i = 1;  !found && (i <= numblks);  ++i) {
        G.cur_zipfile_bufstart -= INBUFSIZ;
#ifdef USE_STRM_INPUT
        zfseeko(G.zipfd, G.cur_zipfile_bufstart, SEEK_SET);
#else /* !USE_STRM_INPUT */
        zlseek(G.zipfd, G.cur_zipfile_bufstart, SEEK_SET);
#endif /* ?USE_STRM_INPUT */
        if ((G.incnt = read(G.zipfd,(char *)G.inbuf,INBUFSIZ))
            != INBUFSIZ)
            return 2;          /* read error is fatal failure */

        for (G.inptr = G.inbuf+INBUFSIZ-1;  G.inptr >= G.inbuf; --G.inptr)
            if ( (*G.inptr == (uch)0x50) &&         /* ASCII 'P' */
                 !memcmp((char *)G.inptr, signature, 4) ) {
                G.incnt -= (int)(G.inptr - G.inbuf);
                found = TRUE;
                break;
            }
        /* sig may span block boundary: */
        memcpy((char *)G.hold, (char *)G.inbuf, 3);
    }
    return (found ? 0 : 1);
} /* end function rec_find() */




#if 0
/********************************/
/* Function check_ecrec_zip64() */
/********************************/

static int check_ecrec_zip64(__G)
    __GDEF
{
    return G.ecrec.offset_start_central_directory  == 0xFFFFFFFFL
        || G.ecrec.size_central_directory          == 0xFFFFFFFFL
        || G.ecrec.total_entries_central_dir       == 0xFFFF
        || G.ecrec.num_entries_centrl_dir_ths_disk == 0xFFFF
        || G.ecrec.num_disk_start_cdir             == 0xFFFF
        || G.ecrec.number_this_disk                == 0xFFFF;
} /* end function check_ecrec_zip64() */
#endif /* never */



/***************************/
/* Function find_ecrec64() */
/***************************/

static int find_ecrec64(__G__ searchlen)         /* return PK-class error */
    __GDEF
    zoff_t searchlen;
{
    ec_byte_rec64 byterec;          /* buf for ecrec64 */
    ec_byte_loc64 byterecL;         /* buf for ecrec64 locator */
    zoff_t ecloc64_start_offset;    /* start offset of ecrec64 locator */
    zusz_t ecrec64_start_offset;    /* start offset of ecrec64 */
    zuvl_t ecrec64_start_disk;      /* start disk of ecrec64 */
    zuvl_t ecloc64_total_disks;     /* total disks */
    zuvl_t ecrec64_disk_cdstart;    /* disk number of central dir start */
    zucn_t ecrec64_this_entries;    /* entries on disk with ecrec64 */
    zucn_t ecrec64_tot_entries;     /* total number of entries */
    zusz_t ecrec64_cdirsize;        /* length of central dir */
    zusz_t ecrec64_offs_cdstart;    /* offset of central dir start */

    /* First, find the ecrec64 locator.  By definition, this must be before
       ecrec with nothing in between.  We back up the size of the ecrec64
       locator and check.  */

    ecloc64_start_offset = G.real_ecrec_offset - (ECLOC64_SIZE+4);
    if (ecloc64_start_offset < 0)
      /* Seeking would go past beginning, so probably empty archive */
      return PK_COOL;

#ifdef USE_STRM_INPUT
    zfseeko(G.zipfd, ecloc64_start_offset, SEEK_SET);
    G.cur_zipfile_bufstart = zftello(G.zipfd);
#else /* !USE_STRM_INPUT */
    G.cur_zipfile_bufstart = zlseek(G.zipfd, ecloc64_start_offset, SEEK_SET);
#endif /* ?USE_STRM_INPUT */

    if ((G.incnt = read(G.zipfd, (char *)byterecL, ECLOC64_SIZE+4))
        != (ECLOC64_SIZE+4)) {
      if (uO.qflag || uO.zipinfo_mode)
          Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
      Info(slide, 0x401, ((char *)slide,
        LoadFarString(Cent64EndSigSearchErr)));
      return PK_ERR;
    }

    if (memcmp((char *)byterecL, end_centloc64_sig, 4) ) {
      /* not found */
      return PK_COOL;
    }

    /* Read the locator. */
    ecrec64_start_disk = (zuvl_t)makelong(&byterecL[NUM_DISK_START_EOCDR64]);
    ecrec64_start_offset = (zusz_t)makeint64(&byterecL[OFFSET_START_EOCDR64]);
    ecloc64_total_disks = (zuvl_t)makelong(&byterecL[NUM_THIS_DISK_LOC64]);

    /* Check for consistency */
#ifdef TEST
    fprintf(stdout,"\nnumber of disks (ECR) %u, (ECLOC64) %lu\n",
            G.ecrec.number_this_disk, ecloc64_total_disks); fflush(stdout);
#endif
    if ((G.ecrec.number_this_disk != 0xFFFF) &&
        (G.ecrec.number_this_disk != ecloc64_total_disks - 1)) {
      /* Note: For some unknown reason, the developers at PKWARE decided to
         store the "zip64 total disks" value as a counter starting from 1,
         whereas all other "split/span volume" related fields use 0-based
         volume numbers. Sigh... */
      /* When the total number of disks as found in the traditional ecrec
         is not 0xFFFF, the disk numbers in ecrec and ecloc64 must match.
         When this is not the case, the found ecrec64 locator cannot be valid.
         -> This is not a Zip64 archive.
       */
      Trace((stderr,
             "\ninvalid ECLOC64, differing disk# (ECR %u, ECL64 %lu)\n",
             G.ecrec.number_this_disk, ecloc64_total_disks - 1));
      return PK_COOL;
    }

    /* If found locator, look for ecrec64 where the locator says it is. */

    /* For now assume that ecrec64 is on the same disk as ecloc64 and ecrec,
       which is usually the case and is how Zip writes it.  To do this right,
       however, we should allow the ecrec64 to be on another disk since
       the AppNote allows it and the ecrec64 can be large, especially if
       Version 2 is used (AppNote uses 8 bytes for the size of this record). */

    /* FIX BELOW IF ADD SUPPORT FOR MULTIPLE DISKS */

    if (ecrec64_start_offset > (zusz_t)ecloc64_start_offset) {
      /* ecrec64 has to be before ecrec64 locator */
      if (uO.qflag || uO.zipinfo_mode)
          Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
      Info(slide, 0x401, ((char *)slide,
        LoadFarString(Cent64EndSigSearchErr)));
      return PK_ERR;
    }

#ifdef USE_STRM_INPUT
    zfseeko(G.zipfd, ecrec64_start_offset, SEEK_SET);
    G.cur_zipfile_bufstart = zftello(G.zipfd);
#else /* !USE_STRM_INPUT */
    G.cur_zipfile_bufstart = zlseek(G.zipfd, ecrec64_start_offset, SEEK_SET);
#endif /* ?USE_STRM_INPUT */

    if ((G.incnt = read(G.zipfd, (char *)byterec, ECREC64_SIZE+4))
        != (ECREC64_SIZE+4)) {
      if (uO.qflag || uO.zipinfo_mode)
          Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
      Info(slide, 0x401, ((char *)slide,
        LoadFarString(Cent64EndSigSearchErr)));
      return PK_ERR;
    }

    if (memcmp((char *)byterec, end_central64_sig, 4) ) {
      /* Zip64 EOCD Record not found */
      /* Since we already have seen the Zip64 EOCD Locator, it's
         possible we got here because there are bytes prepended
         to the archive, like the sfx prefix. */

      /* Make a guess as to where the Zip64 EOCD Record might be */
      ecrec64_start_offset = ecloc64_start_offset - ECREC64_SIZE - 4;

#ifdef USE_STRM_INPUT
      zfseeko(G.zipfd, ecrec64_start_offset, SEEK_SET);
      G.cur_zipfile_bufstart = zftello(G.zipfd);
#else /* !USE_STRM_INPUT */
      G.cur_zipfile_bufstart = zlseek(G.zipfd, ecrec64_start_offset, SEEK_SET);
#endif /* ?USE_STRM_INPUT */

      if ((G.incnt = read(G.zipfd, (char *)byterec, ECREC64_SIZE+4))
          != (ECREC64_SIZE+4)) {
        if (uO.qflag || uO.zipinfo_mode)
            Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
        Info(slide, 0x401, ((char *)slide,
          LoadFarString(Cent64EndSigSearchErr)));
        return PK_ERR;
      }

      if (memcmp((char *)byterec, end_central64_sig, 4) ) {
        /* Zip64 EOCD Record not found */
        /* Probably something not so easy to handle so exit */
        if (uO.qflag || uO.zipinfo_mode)
            Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
        Info(slide, 0x401, ((char *)slide,
          LoadFarString(Cent64EndSigSearchErr)));
        return PK_ERR;
      }

      if (uO.qflag || uO.zipinfo_mode)
          Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
      Info(slide, 0x401, ((char *)slide,
        LoadFarString(Cent64EndSigSearchOff)));
    }

    /* Check consistency of found ecrec64 with ecloc64 (and ecrec): */
    if ( (zuvl_t)makelong(&byterec[NUMBER_THIS_DSK_REC64])
         != ecrec64_start_disk )
        /* found ecrec64 does not match ecloc64 info -> no Zip64 archive */
        return PK_COOL;
    /* Read all relevant ecrec64 fields and compare them to the corresponding
       ecrec fields unless those are set to "all-ones".
     */
    ecrec64_disk_cdstart =
      (zuvl_t)makelong(&byterec[NUM_DISK_START_CEN_DIR64]);
    if ( (G.ecrec.num_disk_start_cdir != 0xFFFF) &&
         (G.ecrec.num_disk_start_cdir != ecrec64_disk_cdstart) )
        return PK_COOL;
    ecrec64_this_entries
      = makeint64(&byterec[NUM_ENTRIES_CEN_DIR_THS_DISK64]);
    if ( (G.ecrec.num_entries_centrl_dir_ths_disk != 0xFFFF) &&
         (G.ecrec.num_entries_centrl_dir_ths_disk != ecrec64_this_entries) )
        return PK_COOL;
    ecrec64_tot_entries
      = makeint64(&byterec[TOTAL_ENTRIES_CENTRAL_DIR64]);
    if ( (G.ecrec.total_entries_central_dir != 0xFFFF) &&
         (G.ecrec.total_entries_central_dir != ecrec64_tot_entries) )
        return PK_COOL;
    ecrec64_cdirsize
      = makeint64(&byterec[SIZE_CENTRAL_DIRECTORY64]);
    if ( (G.ecrec.size_central_directory != 0xFFFFFFFFL) &&
         (G.ecrec.size_central_directory != ecrec64_cdirsize) )
        return PK_COOL;
    ecrec64_offs_cdstart
      = makeint64(&byterec[OFFSET_START_CENTRAL_DIRECT64]);
    if ( (G.ecrec.offset_start_central_directory != 0xFFFFFFFFL) &&
         (G.ecrec.offset_start_central_directory != ecrec64_offs_cdstart) )
        return PK_COOL;

    /* Now, we are (almost) sure that we have a Zip64 archive. */
    G.ecrec.have_ecr64 = 1;

    /* Update the "end-of-central-dir offset" for later checks. */
    G.real_ecrec_offset = ecrec64_start_offset;

    /* Update all ecdir_rec data that are flagged to be invalid
       in Zip64 mode.  Set the ecrec64-mandatory flag when such a
       case is found. */
    if (G.ecrec.number_this_disk == 0xFFFF) {
      G.ecrec.number_this_disk = ecrec64_start_disk;
      if (ecrec64_start_disk != 0xFFFF) G.ecrec.is_zip64_archive = TRUE;
    }
    if (G.ecrec.num_disk_start_cdir == 0xFFFF) {
      G.ecrec.num_disk_start_cdir = ecrec64_disk_cdstart;
      if (ecrec64_disk_cdstart != 0xFFFF) G.ecrec.is_zip64_archive = TRUE;
    }
    if (G.ecrec.num_entries_centrl_dir_ths_disk == 0xFFFF) {
      G.ecrec.num_entries_centrl_dir_ths_disk = ecrec64_this_entries;
      if (ecrec64_this_entries != 0xFFFF) G.ecrec.is_zip64_archive = TRUE;
    }
    if (G.ecrec.total_entries_central_dir == 0xFFFF) {
      G.ecrec.total_entries_central_dir = ecrec64_tot_entries;
      if (ecrec64_tot_entries != 0xFFFF) G.ecrec.is_zip64_archive = TRUE;
    }
    if (G.ecrec.size_central_directory == 0xFFFFFFFFL) {
      G.ecrec.size_central_directory = ecrec64_cdirsize;
      if (ecrec64_cdirsize != 0xFFFFFFFF) G.ecrec.is_zip64_archive = TRUE;
    }
    if (G.ecrec.offset_start_central_directory == 0xFFFFFFFFL) {
      G.ecrec.offset_start_central_directory = ecrec64_offs_cdstart;
      if (ecrec64_offs_cdstart != 0xFFFFFFFF) G.ecrec.is_zip64_archive = TRUE;
    }

    return PK_COOL;
} /* end function find_ecrec64() */



/*************************/
/* Function find_ecrec() */
/*************************/

static int find_ecrec(__G__ searchlen)          /* return PK-class error */
    __GDEF
    zoff_t searchlen;
{
    int found = FALSE;
    int error_in_archive;
    int result;
    ec_byte_rec byterec;

/*---------------------------------------------------------------------------
    Treat case of short zipfile separately.
  ---------------------------------------------------------------------------*/

    if (G.ziplen <= INBUFSIZ) {
#ifdef USE_STRM_INPUT
        zfseeko(G.zipfd, 0L, SEEK_SET);
#else /* !USE_STRM_INPUT */
        zlseek(G.zipfd, 0L, SEEK_SET);
#endif /* ?USE_STRM_INPUT */
        if ((G.incnt = read(G.zipfd,(char *)G.inbuf,(unsigned int)G.ziplen))
            == (int)G.ziplen)

            /* 'P' must be at least (ECREC_SIZE+4) bytes from end of zipfile */
            for (G.inptr = G.inbuf+(int)G.ziplen-(ECREC_SIZE+4);
                 G.inptr >= G.inbuf;
                 --G.inptr) {
                if ( (*G.inptr == (uch)0x50) &&         /* ASCII 'P' */
                     !memcmp((char *)G.inptr, end_central_sig, 4)) {
                    G.incnt -= (int)(G.inptr - G.inbuf);
                    found = TRUE;
                    break;
                }
            }

/*---------------------------------------------------------------------------
    Zipfile is longer than INBUFSIZ:

    MB - this next block of code moved to rec_find so that same code can be
    used to look for zip64 ec record.  No need to include code above since
    a zip64 ec record will only be looked for if it is a BIG file.
  ---------------------------------------------------------------------------*/

    } else {
        found =
          (rec_find(__G__ searchlen, end_central_sig, ECREC_SIZE) == 0
           ? TRUE : FALSE);
    } /* end if (ziplen > INBUFSIZ) */

/*---------------------------------------------------------------------------
    Searched through whole region where signature should be without finding
    it.  Print informational message and die a horrible death.
  ---------------------------------------------------------------------------*/

    if (!found) {
        if (uO.qflag || uO.zipinfo_mode)
            Info(slide, 0x401, ((char *)slide, "[%s]\n", G.zipfn));
        Info(slide, 0x401, ((char *)slide,
          LoadFarString(CentDirEndSigNotFound)));
        return PK_ERR;   /* failed */
    }

/*---------------------------------------------------------------------------
    Found the signature, so get the end-central data before returning.  Do
    any necessary machine-type conversions (byte ordering, structure padding
    compensation) by reading data into character array and copying to struct.
  ---------------------------------------------------------------------------*/

    G.real_ecrec_offset = G.cur_zipfile_bufstart + (G.inptr-G.inbuf);
#ifdef TEST
    printf("\n  found end-of-central-dir signature at offset %s (%sh)\n",
      FmZofft(G.real_ecrec_offset, NULL, NULL),
      FmZofft(G.real_ecrec_offset, FZOFFT_HEX_DOT_WID, "X"));
    printf("    from beginning of file; offset %d (%.4Xh) within block\n",
      G.inptr-G.inbuf, G.inptr-G.inbuf);
#endif

    if (readbuf(__G__ (char *)byterec, ECREC_SIZE+4) == 0)
        return PK_EOF;

    G.ecrec.number_this_disk =
      makeword(&byterec[NUMBER_THIS_DISK]);
    G.ecrec.num_disk_start_cdir =
      makeword(&byterec[NUM_DISK_WITH_START_CEN_DIR]);
    G.ecrec.num_entries_centrl_dir_ths_disk =
      makeword(&byterec[NUM_ENTRIES_CEN_DIR_THS_DISK]);
    G.ecrec.total_entries_central_dir =
      makeword(&byterec[TOTAL_ENTRIES_CENTRAL_DIR]);
    G.ecrec.size_central_directory =
      makelong(&byterec[SIZE_CENTRAL_DIRECTORY]);
    G.ecrec.offset_start_central_directory =
      makelong(&byterec[OFFSET_START_CENTRAL_DIRECTORY]);
    G.ecrec.zipfile_comment_length =
      makeword(&byterec[ZIPFILE_COMMENT_LENGTH]);

    /* Now, we have to read the archive comment, BEFORE the file pointer
       is moved away backwards to seek for a Zip64 ECLOC64 structure.
     */
    if ( (error_in_archive = process_zip_cmmnt(__G)) > PK_WARN )
        return error_in_archive;

    /* Next: Check for existence of Zip64 end-of-cent-dir locator
       ECLOC64. This structure must reside on the same volume as the
       classic ECREC, at exactly (ECLOC64_SIZE+4) bytes in front
       of the ECREC.
       The ECLOC64 structure directs to the longer ECREC64 structure
       A ECREC64 will ALWAYS exist for a proper Zip64 archive, as
       the "Version Needed To Extract" field is required to be set
       to 4.5 or higher whenever any Zip64 features are used anywhere
       in the archive, so just check for that to see if this is a
       Zip64 archive.
     */
    result = find_ecrec64(__G__ searchlen+76);
        /* 76 bytes for zip64ec & zip64 locator */
    if (result != PK_COOL) {
        if (error_in_archive < result)
            error_in_archive = result;
        return error_in_archive;
    }

    G.expect_ecrec_offset = G.ecrec.offset_start_central_directory +
                            G.ecrec.size_central_directory;

#ifndef NO_ZIPINFO
    if (uO.zipinfo_mode) {
        /* In ZipInfo mode, additional info about the data found in the
           end-of-central-directory areas is printed out.
         */
        zi_end_central(__G);
    }
#endif

    return error_in_archive;

} /* end function find_ecrec() */





/********************************/
/* Function process_zip_cmmnt() */
/********************************/

static int process_zip_cmmnt(__G)       /* return PK-type error code */
    __GDEF
{
    int error = PK_COOL;


/*---------------------------------------------------------------------------
    Get the zipfile comment (up to 64KB long), if any, and print it out.
  ---------------------------------------------------------------------------*/

#ifdef WINDLL
    /* for comment button: */
    if ((!G.fValidate) && (G.lpUserFunctions != NULL))
       G.lpUserFunctions->cchComment = G.ecrec.zipfile_comment_length;
#endif /* WINDLL */

#ifndef NO_ZIPINFO
    /* ZipInfo, verbose format */
    if (uO.zipinfo_mode && uO.lflag > 9) {
        /*-------------------------------------------------------------------
            Get the zipfile comment, if any, and print it out.
            (Comment may be up to 64KB long.  May the fleas of a thousand
            camels infest the arm-pits of anyone who actually takes advantage
            of this fact.)
          -------------------------------------------------------------------*/

        if (!G.ecrec.zipfile_comment_length)
            Info(slide, 0, ((char *)slide, LoadFarString(NoZipfileComment)));
        else {
            Info(slide, 0, ((char *)slide, LoadFarString(ZipfileCommentDesc),
              G.ecrec.zipfile_comment_length));
            Info(slide, 0, ((char *)slide, LoadFarString(ZipfileCommBegin)));
            if (do_string(__G__ G.ecrec.zipfile_comment_length, DISPLAY))
                error = PK_WARN;
            Info(slide, 0, ((char *)slide, LoadFarString(ZipfileCommEnd)));
            if (error)
                Info(slide, 0, ((char *)slide,
                  LoadFarString(ZipfileCommTrunc2)));
        } /* endif (comment exists) */

    /* ZipInfo, non-verbose mode:  print zipfile comment only if requested */
    } else if (G.ecrec.zipfile_comment_length &&
               (uO.zflag > 0) && uO.zipinfo_mode) {
        if (do_string(__G__ G.ecrec.zipfile_comment_length, DISPLAY)) {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(ZipfileCommTrunc1)));
            error = PK_WARN;
        }
    } else
#endif /* !NO_ZIPINFO */
    if ( G.ecrec.zipfile_comment_length &&
         (uO.zflag > 0
#ifndef WINDLL
          || (uO.zflag == 0
# ifndef NO_ZIPINFO
              && !uO.zipinfo_mode
# endif
# ifdef TIMESTAMP
              && !uO.T_flag
# endif
              && !uO.qflag)
#endif /* !WINDLL */
         ) )
    {
        if (do_string(__G__ G.ecrec.zipfile_comment_length,
#if (defined(SFX) && defined(CHEAP_SFX_AUTORUN))
# ifndef NO_ZIPINFO
                      (oU.zipinfo_mode ? DISPLAY : CHECK_AUTORUN)
# else
                      CHECK_AUTORUN
# endif
#else
                      DISPLAY
#endif
                     ))
        {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(ZipfileCommTrunc1)));
            error = PK_WARN;
        }
    }
#if (defined(SFX) && defined(CHEAP_SFX_AUTORUN))
    else if (G.ecrec.zipfile_comment_length) {
        if (do_string(__G__ G.ecrec.zipfile_comment_length, CHECK_AUTORUN_Q))
        {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(ZipfileCommTrunc1)));
            error = PK_WARN;
        }
    }
#endif
    return error;

} /* end function process_zip_cmmnt() */





/************************************/
/* Function process_cdir_file_hdr() */
/************************************/

int process_cdir_file_hdr(__G)    /* return PK-type error code */
    __GDEF
{
    int error;


/*---------------------------------------------------------------------------
    Get central directory info, save host and method numbers, and set flag
    for lowercase conversion of filename, depending on the OS from which the
    file is coming.
  ---------------------------------------------------------------------------*/

    if ((error = get_cdir_ent(__G)) != 0)
        return error;

    G.pInfo->hostver = G.crec.version_made_by[0];
    G.pInfo->hostnum = MIN(G.crec.version_made_by[1], NUM_HOSTS);
/*  extnum = MIN(crec.version_needed_to_extract[1], NUM_HOSTS); */

    G.pInfo->lcflag = 0;
    if (uO.L_flag == 1)       /* name conversion for monocase systems */
        switch (G.pInfo->hostnum) {
            case FS_FAT_:     /* PKZIP and zip -k store in uppercase */
            case CPM_:        /* like MS-DOS, right? */
            case VM_CMS_:     /* all caps? */
            case MVS_:        /* all caps? */
            case TANDEM_:
            case TOPS20_:
            case VMS_:        /* our Zip uses lowercase, but ASi's doesn't */
        /*  case Z_SYSTEM_:   ? */
        /*  case QDOS_:       ? */
                G.pInfo->lcflag = 1;   /* convert filename to lowercase */
                break;

            default:     /* AMIGA_, FS_HPFS_, FS_NTFS_, MAC_, UNIX_, ATARI_, */
                break;   /*  FS_VFAT_, ATHEOS_, BEOS_ (Z_SYSTEM_), THEOS_: */
                         /*  no conversion */
        }
    else if (uO.L_flag > 1)   /* let -LL force lower case for all names */
        G.pInfo->lcflag = 1;

    /* do Amigas (AMIGA_) also have volume labels? */
    if (IS_VOLID(G.crec.external_file_attributes) &&
        (G.pInfo->hostnum == FS_FAT_ || G.pInfo->hostnum == FS_HPFS_ ||
         G.pInfo->hostnum == FS_NTFS_ || G.pInfo->hostnum == ATARI_))
    {
        G.pInfo->vollabel = TRUE;
        G.pInfo->lcflag = 0;        /* preserve case of volume labels */
    } else
        G.pInfo->vollabel = FALSE;

    /* this flag is needed to detect archives made by "PKZIP for Unix" when
       deciding which kind of codepage conversion has to be applied to
       strings (see do_string() function in fileio.c) */
    G.pInfo->HasUxAtt = (G.crec.external_file_attributes & 0xffff0000L) != 0L;

#ifdef UNICODE_SUPPORT
    /* remember the state of GPB11 (General Purpuse Bit 11) which indicates
       that the standard path and comment are UTF-8. */
    G.pInfo->GPFIsUTF8
        = (G.crec.general_purpose_bit_flag & (1 << 11)) == (1 << 11);
#endif

    return PK_COOL;

} /* end function process_cdir_file_hdr() */





/***************************/
/* Function get_cdir_ent() */
/***************************/

static int get_cdir_ent(__G)    /* return PK-type error code */
    __GDEF
{
    cdir_byte_hdr byterec;


/*---------------------------------------------------------------------------
    Read the next central directory entry and do any necessary machine-type
    conversions (byte ordering, structure padding compensation--do so by
    copying the data from the array into which it was read (byterec) to the
    usable struct (crec)).
  ---------------------------------------------------------------------------*/

    if (readbuf(__G__ (char *)byterec, CREC_SIZE) == 0)
        return PK_EOF;

    G.crec.version_made_by[0] = byterec[C_VERSION_MADE_BY_0];
    G.crec.version_made_by[1] = byterec[C_VERSION_MADE_BY_1];
    G.crec.version_needed_to_extract[0] =
      byterec[C_VERSION_NEEDED_TO_EXTRACT_0];
    G.crec.version_needed_to_extract[1] =
      byterec[C_VERSION_NEEDED_TO_EXTRACT_1];

    G.crec.general_purpose_bit_flag =
      makeword(&byterec[C_GENERAL_PURPOSE_BIT_FLAG]);
    G.crec.compression_method =
      makeword(&byterec[C_COMPRESSION_METHOD]);
    G.crec.last_mod_dos_datetime =
      makelong(&byterec[C_LAST_MOD_DOS_DATETIME]);
    G.crec.crc32 =
      makelong(&byterec[C_CRC32]);
    G.crec.csize =
      makelong(&byterec[C_COMPRESSED_SIZE]);
    G.crec.ucsize =
      makelong(&byterec[C_UNCOMPRESSED_SIZE]);
    G.crec.filename_length =
      makeword(&byterec[C_FILENAME_LENGTH]);
    G.crec.extra_field_length =
      makeword(&byterec[C_EXTRA_FIELD_LENGTH]);
    G.crec.file_comment_length =
      makeword(&byterec[C_FILE_COMMENT_LENGTH]);
    G.crec.disk_number_start =
      makeword(&byterec[C_DISK_NUMBER_START]);
    G.crec.internal_file_attributes =
      makeword(&byterec[C_INTERNAL_FILE_ATTRIBUTES]);
    G.crec.external_file_attributes =
      makelong(&byterec[C_EXTERNAL_FILE_ATTRIBUTES]);  /* LONG, not word! */
    G.crec.relative_offset_local_header =
      makelong(&byterec[C_RELATIVE_OFFSET_LOCAL_HEADER]);

    return PK_COOL;

} /* end function get_cdir_ent() */





/*************************************/
/* Function process_local_file_hdr() */
/*************************************/

int process_local_file_hdr(__G)    /* return PK-type error code */
    __GDEF
{
    local_byte_hdr byterec;


/*---------------------------------------------------------------------------
    Read the next local file header and do any necessary machine-type con-
    versions (byte ordering, structure padding compensation--do so by copy-
    ing the data from the array into which it was read (byterec) to the
    usable struct (lrec)).
  ---------------------------------------------------------------------------*/

    if (readbuf(__G__ (char *)byterec, LREC_SIZE) == 0)
        return PK_EOF;

    G.lrec.version_needed_to_extract[0] =
      byterec[L_VERSION_NEEDED_TO_EXTRACT_0];
    G.lrec.version_needed_to_extract[1] =
      byterec[L_VERSION_NEEDED_TO_EXTRACT_1];

    G.lrec.general_purpose_bit_flag =
      makeword(&byterec[L_GENERAL_PURPOSE_BIT_FLAG]);
    G.lrec.compression_method = makeword(&byterec[L_COMPRESSION_METHOD]);
    G.lrec.last_mod_dos_datetime = makelong(&byterec[L_LAST_MOD_DOS_DATETIME]);
    G.lrec.crc32 = makelong(&byterec[L_CRC32]);
    G.lrec.csize = makelong(&byterec[L_COMPRESSED_SIZE]);
    G.lrec.ucsize = makelong(&byterec[L_UNCOMPRESSED_SIZE]);
    G.lrec.filename_length = makeword(&byterec[L_FILENAME_LENGTH]);
    G.lrec.extra_field_length = makeword(&byterec[L_EXTRA_FIELD_LENGTH]);

    if ((G.lrec.general_purpose_bit_flag & 8) != 0) {
        /* can't trust local header, use central directory: */
        G.lrec.crc32 = G.pInfo->crc;
        G.lrec.csize = G.pInfo->compr_size;
        G.lrec.ucsize = G.pInfo->uncompr_size;
    }

    G.csize = G.lrec.csize;

    return PK_COOL;

} /* end function process_local_file_hdr() */


/*******************************/
/* Function getZip64Data() */
/*******************************/

int getZip64Data(__G__ ef_buf, ef_len)
    __GDEF
    ZCONST uch *ef_buf; /* buffer containing extra field */
    unsigned ef_len;    /* total length of extra field */
{
    unsigned eb_id;
    unsigned eb_len;

/*---------------------------------------------------------------------------
    This function scans the extra field for zip64 information, ie 8-byte
    versions of compressed file size, uncompressed file size, relative offset
    and a 4-byte version of disk start number.
    Sets both local header and central header fields.  Not terribly clever,
    but it means that this procedure is only called in one place.
  ---------------------------------------------------------------------------*/

    if (ef_len == 0 || ef_buf == NULL)
        return PK_COOL;

    Trace((stderr,"\ngetZip64Data: scanning extra field of length %u\n",
      ef_len));

    while (ef_len >= EB_HEADSIZE) {
        eb_id = makeword(EB_ID + ef_buf);
        eb_len = makeword(EB_LEN + ef_buf);

        if (eb_len > (ef_len - EB_HEADSIZE)) {
            /* discovered some extra field inconsistency! */
            Trace((stderr,
              "getZip64Data: block length %u > rest ef_size %u\n", eb_len,
              ef_len - EB_HEADSIZE));
            break;
        }
        if (eb_id == EF_PKSZ64) {

          int offset = EB_HEADSIZE;

          if (G.crec.ucsize == 0xffffffff || G.lrec.ucsize == 0xffffffff){
            G.lrec.ucsize = G.crec.ucsize = makeint64(offset + ef_buf);
            offset += sizeof(G.crec.ucsize);
          }
          if (G.crec.csize == 0xffffffff || G.lrec.csize == 0xffffffff){
            G.csize = G.lrec.csize = G.crec.csize = makeint64(offset + ef_buf);
            offset += sizeof(G.crec.csize);
          }
          if (G.crec.relative_offset_local_header == 0xffffffff){
            G.crec.relative_offset_local_header = makeint64(offset + ef_buf);
            offset += sizeof(G.crec.relative_offset_local_header);
          }
          if (G.crec.disk_number_start == 0xffff){
            G.crec.disk_number_start = (zuvl_t)makelong(offset + ef_buf);
            offset += sizeof(G.crec.disk_number_start);
          }
        }

        /* Skip this extra field block */
        ef_buf += (eb_len + EB_HEADSIZE);
        ef_len -= (eb_len + EB_HEADSIZE);
    }

    return PK_COOL;
} /* end function getZip64Data() */


#ifdef UNICODE_SUPPORT

/*******************************/
/* Function getUnicodeData() */
/*******************************/

int getUnicodeData(__G__ ef_buf, ef_len)
    __GDEF
    ZCONST uch *ef_buf; /* buffer containing extra field */
    unsigned ef_len;    /* total length of extra field */
{
    unsigned eb_id;
    unsigned eb_len;

/*---------------------------------------------------------------------------
    This function scans the extra field for Unicode information, ie UTF-8
    path extra fields.

    On return, G.unipath_filename =
        NULL, if no Unicode path extra field or error
        "", if the standard path is UTF-8 (free when done)
        null-terminated UTF-8 path (free when done)
    Return PK_COOL if no error.
  ---------------------------------------------------------------------------*/

    G.unipath_filename = NULL;

    if (ef_len == 0 || ef_buf == NULL)
        return PK_COOL;

    Trace((stderr,"\ngetUnicodeData: scanning extra field of length %u\n",
      ef_len));

    while (ef_len >= EB_HEADSIZE) {
        eb_id = makeword(EB_ID + ef_buf);
        eb_len = makeword(EB_LEN + ef_buf);

        if (eb_len > (ef_len - EB_HEADSIZE)) {
            /* discovered some extra field inconsistency! */
            Trace((stderr,
              "getUnicodeData: block length %u > rest ef_size %u\n", eb_len,
              ef_len - EB_HEADSIZE));
            break;
        }
        if (eb_id == EF_UNIPATH) {

          int offset = EB_HEADSIZE;
          ush ULen = eb_len - 5;
          ulg chksum = CRCVAL_INITIAL;

          /* version */
          G.unipath_version = (uch) *(offset + ef_buf);
          offset += 1;
          if (G.unipath_version > 1) {
            /* can do only version 1 */
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(UnicodeVersionError)));
            return PK_ERR;
          }

          /* filename CRC */
          G.unipath_checksum = makelong(offset + ef_buf);
          offset += 4;

          /*
           * Compute 32-bit crc
           */

          chksum = crc32(chksum, (uch *)(G.filename_full),
                         strlen(G.filename_full));

          /* If the checksums's don't match then likely filename has been
           * modified and the Unicode Path is no longer valid.
           */
          if (chksum != G.unipath_checksum) {
            Info(slide, 0x401, ((char *)slide,
              LoadFarString(UnicodeMismatchError)));
            if (G.unicode_mismatch == 1) {
              /* warn and continue */
            } else if (G.unicode_mismatch == 2) {
              /* ignore and continue */
            } else if (G.unicode_mismatch == 0) {
            }
            return PK_ERR;
          }

          /* UTF-8 Path */
          if ((G.unipath_filename = malloc(ULen + 1)) == NULL) {
            return PK_ERR;
          }
          if (ULen == 0) {
            /* standard path is UTF-8 so use that */
            G.unipath_filename[0] = '\0';
          } else {
            /* UTF-8 path */
            strncpy(G.unipath_filename,
                    (ZCONST char *)(offset + ef_buf), ULen);
            G.unipath_filename[ULen] = '\0';
          }
        }

        /* Skip this extra field block */
        ef_buf += (eb_len + EB_HEADSIZE);
        ef_len -= (eb_len + EB_HEADSIZE);
    }

    return PK_COOL;
} /* end function getUnicodeData() */




#ifdef UNICODE_WCHAR
  /*---------------------------------------------
 * Unicode conversion functions
 *
 * Based on functions provided by Paul Kienitz
 *
 *---------------------------------------------
 */

/*
   NOTES APPLICABLE TO ALL STRING FUNCTIONS:

   All of the x_to_y functions take parameters for an output buffer and
   its available length, and return an int.  The value returned is the
   length of the string that the input produces, which may be larger than
   the provided buffer length.  If the returned value is less than the
   buffer length, then the contents of the buffer will be null-terminated;
   otherwise, it will not be terminated and may be invalid, possibly
   stopping in the middle of a multibyte sequence.

   In all cases you may pass NULL as the buffer and/or 0 as the length, if
   you just want to learn how much space the string is going to require.

   The functions will return -1 if the input is invalid UTF-8 or cannot be
   encoded as UTF-8.
*/

static int utf8_char_bytes OF((ZCONST char *utf8));
static ulg ucs4_char_from_utf8 OF((ZCONST char **utf8));
static int utf8_to_ucs4_string OF((ZCONST char *utf8, ulg *ucs4buf,
                                   int buflen));

/* utility functions for managing UTF-8 and UCS-4 strings */


/* utf8_char_bytes
 *
 * Returns the number of bytes used by the first character in a UTF-8
 * string, or -1 if the UTF-8 is invalid or null.
 */
static int utf8_char_bytes(utf8)
  ZCONST char *utf8;
{
  int      t, r;
  unsigned lead;

  if (!utf8)
    return -1;          /* no input */
  lead = (unsigned char) *utf8;
  if (lead < 0x80)
    r = 1;              /* an ascii-7 character */
  else if (lead < 0xC0)
    return -1;          /* error: trailing byte without lead byte */
  else if (lead < 0xE0)
    r = 2;              /* an 11 bit character */
  else if (lead < 0xF0)
    r = 3;              /* a 16 bit character */
  else if (lead < 0xF8)
    r = 4;              /* a 21 bit character (the most currently used) */
  else if (lead < 0xFC)
    r = 5;              /* a 26 bit character (shouldn't happen) */
  else if (lead < 0xFE)
    r = 6;              /* a 31 bit character (shouldn't happen) */
  else
    return -1;          /* error: invalid lead byte */
  for (t = 1; t < r; t++)
    if ((unsigned char) utf8[t] < 0x80 || (unsigned char) utf8[t] >= 0xC0)
      return -1;        /* error: not enough valid trailing bytes */
  return r;
}


/* ucs4_char_from_utf8
 *
 * Given a reference to a pointer into a UTF-8 string, returns the next
 * UCS-4 character and advances the pointer to the next character sequence.
 * Returns ~0 (= -1 in twos-complement notation) and does not advance the
 * pointer when input is ill-formed.
 */
static ulg ucs4_char_from_utf8(utf8)
  ZCONST char **utf8;
{
  ulg  ret;
  int  t, bytes;

  if (!utf8)
    return ~0L;                         /* no input */
  bytes = utf8_char_bytes(*utf8);
  if (bytes <= 0)
    return ~0L;                         /* invalid input */
  if (bytes == 1)
    ret = **utf8;                       /* ascii-7 */
  else
    ret = **utf8 & (0x7F >> bytes);     /* lead byte of a multibyte sequence */
  (*utf8)++;
  for (t = 1; t < bytes; t++)           /* consume trailing bytes */
    ret = (ret << 6) | (*((*utf8)++) & 0x3F);
  return (zwchar) ret;
}


#if 0 /* currently unused */
/* utf8_from_ucs4_char - Convert UCS char to UTF-8
 *
 * Returns the number of bytes put into utf8buf to represent ch, from 1 to 6,
 * or -1 if ch is too large to represent.  utf8buf must have room for 6 bytes.
 */
static int utf8_from_ucs4_char(utf8buf, ch)
  char *utf8buf;
  ulg ch;
{
  int trailing = 0;
  int leadmask = 0x80;
  int leadbits = 0x3F;
  int tch = ch;
  int ret;

  if (ch > 0x7FFFFFFFL)
    return -1;                /* UTF-8 can represent 31 bits */
  if (ch < 0x7F)
  {
    *utf8buf++ = (char) ch;   /* ascii-7 */
    return 1;
  }
  do {
    trailing++;
    leadmask = (leadmask >> 1) | 0x80;
    leadbits >>= 1;
    tch >>= 6;
  } while (tch & ~leadbits);
  ret = trailing + 1;
  /* produce lead byte */
  *utf8buf++ = (char) (leadmask | (ch >> (6 * trailing)));
  while (--trailing >= 0)
    /* produce trailing bytes */
    *utf8buf++ = (char) (0x80 | ((ch >> (6 * trailing)) & 0x3F));
  return ret;
}
#endif /* unused */


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

/* utf8_to_ucs4_string - convert UTF-8 string to UCS string
 *
 * Return UCS count.  Now returns int so can return -1.
 */
static int utf8_to_ucs4_string(utf8, ucs4buf, buflen)
  ZCONST char *utf8;
  ulg *ucs4buf;
  int buflen;
{
  int count = 0;

  for (;;)
  {
    ulg ch = ucs4_char_from_utf8(&utf8);
    if (ch == ~0L)
      return -1;
    else
    {
      if (ucs4buf && count < buflen)
        ucs4buf[count] = ch;
      if (ch == 0)
        return count;
      count++;
    }
  }
}


#if 0 /* currently unused */
/* ucs4_string_to_utf8
 *
 *
 */
static int ucs4_string_to_utf8(ucs4, utf8buf, buflen)
  ZCONST ulg *ucs4;
  char *utf8buf;
  int buflen;
{
  char mb[6];
  int  count = 0;

  if (!ucs4)
    return -1;
  for (;;)
  {
    int mbl = utf8_from_ucs4_char(mb, *ucs4++);
    int c;
    if (mbl <= 0)
      return -1;
    /* We could optimize this a bit by passing utf8buf + count */
    /* directly to utf8_from_ucs4_char when buflen >= count + 6... */
    c = buflen - count;
    if (mbl < c)
      c = mbl;
    if (utf8buf && count < buflen)
      strncpy(utf8buf + count, mb, c);
    if (mbl == 1 && !mb[0])
      return count;           /* terminating nul */
    count += mbl;
  }
}


/* utf8_chars
 *
 * Wrapper: counts the actual unicode characters in a UTF-8 string.
 */
static int utf8_chars(utf8)
  ZCONST char *utf8;
{
  return utf8_to_ucs4_string(utf8, NULL, 0);
}
#endif /* unused */

/* --------------------------------------------------- */
/* Unicode Support
 *
 * These functions common for all Unicode ports.
 *
 * These functions should allocate and return strings that can be
 * freed with free().
 *
 * 8/27/05 EG
 *
 * Use zwchar for wide char which is unsigned long
 * in zip.h and 32 bits.  This avoids problems with
 * different sizes of wchar_t.
 */

#if 0 /* currently unused */
/* is_ascii_string
 * Checks if a string is all ascii
 */
int is_ascii_string(mbstring)
  ZCONST char *mbstring;
{
  char *p;
  uch c;

  for (p = mbstring; c = (uch)*p; p++) {
    if (c > 0x7F) {
      return 0;
    }
  }
  return 1;
}

/* local to UTF-8 */
char *local_to_utf8_string(local_string)
  ZCONST char *local_string;
{
  return wide_to_utf8_string(local_to_wide_string(local_string));
}
# endif /* unused */

/* wide_to_escape_string
   provides a string that represents a wide char not in local char set

   An initial try at an algorithm.  Suggestions welcome.

   According to the standard, Unicode character points are restricted to
   the number range from 0 to 0x10FFFF, respective 21 bits.
   For a hexadecimal notation, 2 octets are sufficient for the mostly
   used characters from the "Basic Multilingual Plane", all other
   Unicode characters can be represented by 3 octets (= 6 hex digits).
   The Unicode standard suggests to write Unicode character points
   as 4 resp. 6 hex digits, preprended by "U+".
   (e.g.: U+10FFFF for the highest character point, or U+0030 for the ASCII
   digit "0")

   However, for the purpose of escaping non-ASCII chars in an ASCII character
   stream, the "U" is not a very good escape initializer. Therefore, we
   use the following convention within our Info-ZIP code:

   If not an ASCII char probably need 2 bytes at least.  So if
   a 2-byte wide encode it as 4 hex digits with a leading #U.  If
   needs 3 bytes then prefix the string with #L.  So
   #U1234
   is a 2-byte wide character with bytes 0x12 and 0x34 while
   #L123456
   is a 3-byte wide character with bytes 0x12, 0x34, 0x56.
   On Windows, wide that need two wide characters need to be converted
   to a single number.
  */

 /* set this to the max bytes an escape can be */
#define MAX_ESCAPE_BYTES 8

char *wide_to_escape_string(wide_char)
  zwchar wide_char;
{
  int i;
  zwchar w = wide_char;
  uch b[sizeof(zwchar)];
  char d[3];
  char e[11];
  int len;
  char *r;

  /* fill byte array with zeros */
  memzero(b, sizeof(zwchar));
  /* get bytes in right to left order */
  for (len = 0; w; len++) {
    b[len] = (char)(w % 0x100);
    w /= 0x100;
  }
  strcpy(e, "#");
  /* either 2 bytes or 3 bytes */
  if (len <= 2) {
    len = 2;
    strcat(e, "U");
  } else {
    strcat(e, "L");
  }
  for (i = len - 1; i >= 0; i--) {
    sprintf(d, "%02x", b[i]);
    strcat(e, d);
  }
  if ((r = malloc(strlen(e) + 1)) == NULL) {
    return NULL;
  }
  strcpy(r, e);
  return r;
}

#if 0 /* currently unused */
/* returns the wide character represented by the escape string */
zwchar escape_string_to_wide(escape_string)
  ZCONST char *escape_string;
{
  int i;
  zwchar w;
  char c;
  int len;
  ZCONST char *e = escape_string;

  if (e == NULL) {
    return 0;
  }
  if (e[0] != '#') {
    /* no leading # */
    return 0;
  }
  len = strlen(e);
  /* either #U1234 or #L123456 format */
  if (len != 6 && len != 8) {
    return 0;
  }
  w = 0;
  if (e[1] == 'L') {
    if (len != 8) {
      return 0;
    }
    /* 3 bytes */
    for (i = 2; i < 8; i++) {
      c = e[i];
      if (c < '0' || c > '9') {
        return 0;
      }
      w = w * 0x10 + (zwchar)(c - '0');
    }
  } else if (e[1] == 'U') {
    /* 2 bytes */
    for (i = 2; i < 6; i++) {
      c = e[i];
      if (c < '0' || c > '9') {
        return 0;
      }
      w = w * 0x10 + (zwchar)(c - '0');
    }
  }
  return w;
}
#endif /* unused */

#ifndef WIN32  /* WIN32 supplies a special variant of this function */
/* convert wide character string to multi-byte character string */
char *wide_to_local_string(wide_string, escape_all)
  ZCONST zwchar *wide_string;
  int escape_all;
{
  int i;
  wchar_t wc;
  int b;
  int state_dependent;
  int wsize = 0;
  int max_bytes = MB_CUR_MAX;
  char buf[9];
  char *buffer = NULL;
  char *local_string = NULL;

  for (wsize = 0; wide_string[wsize]; wsize++) ;

  if (max_bytes < MAX_ESCAPE_BYTES)
    max_bytes = MAX_ESCAPE_BYTES;

  if ((buffer = (char *)malloc(wsize * max_bytes + 1)) == NULL) {
    return NULL;
  }

  /* convert it */
  buffer[0] = '\0';
  /* set initial state if state-dependent encoding */
  wc = (wchar_t)'a';
  b = wctomb(NULL, wc);
  if (b == 0)
    state_dependent = 0;
  else
    state_dependent = 1;
  for (i = 0; i < wsize; i++) {
    if (sizeof(wchar_t) < 4 && wide_string[i] > 0xFFFF) {
      /* wchar_t probably 2 bytes */
      /* could do surrogates if state_dependent and wctomb can do */
      wc = zwchar_to_wchar_t_default_char;
    } else {
      wc = (wchar_t)wide_string[i];
    }
    b = wctomb(buf, wc);
    if (escape_all) {
      if (b == 1 && (uch)buf[0] <= 0x7f) {
        /* ASCII */
        strncat(buffer, buf, b);
      } else {
        /* use escape for wide character */
        char *escape_string = wide_to_escape_string(wide_string[i]);
        strcat(buffer, escape_string);
        free(escape_string);
      }
    } else if (b > 0) {
      /* multi-byte char */
      strncat(buffer, buf, b);
    } else {
      /* no MB for this wide */
        /* use escape for wide character */
        char *escape_string = wide_to_escape_string(wide_string[i]);
        strcat(buffer, escape_string);
        free(escape_string);
    }
  }
  if ((local_string = (char *)malloc(strlen(buffer) + 1)) != NULL) {
    strcpy(local_string, buffer);
  }
  free(buffer);

  return local_string;
}
#endif /* !WIN32 */

#if 0 /* currently unused */
/* convert local string to display character set string */
char *local_to_display_string(local_string)
  ZCONST char *local_string;
{
  char *display_string;

  /* For Windows, OEM string should never be bigger than ANSI string, says
     CharToOem description.
     For all other ports, just make a copy of local_string.
  */
  if ((display_string = (char *)malloc(strlen(local_string) + 1)) == NULL) {
    return NULL;
  }

  strcpy(display_string, local_string);

#ifdef EBCDIC
  {
    char *ebc;

    if ((ebc = malloc(strlen(display_string) + 1)) ==  NULL) {
      return NULL;
    }
    strtoebc(ebc, display_string);
    free(display_string);
    display_string = ebc;
  }
#endif

  return display_string;
}
#endif /* unused */

/* UTF-8 to local */
char *utf8_to_local_string(utf8_string, escape_all)
  ZCONST char *utf8_string;
  int escape_all;
{
  zwchar *wide = utf8_to_wide_string(utf8_string);
  char *loc = wide_to_local_string(wide, escape_all);
  free(wide);
  return loc;
}

#if 0 /* currently unused */
/* convert multi-byte character string to wide character string */
zwchar *local_to_wide_string(local_string)
  ZCONST char *local_string;
{
  int wsize;
  wchar_t *wc_string;
  zwchar *wide_string;

  /* for now try to convert as string - fails if a bad char in string */
  wsize = mbstowcs(NULL, local_string, strlen(local_string) + 1);
  if (wsize == (size_t)-1) {
    /* could not convert */
    return NULL;
  }

  /* convert it */
  if ((wc_string = (wchar_t *)malloc((wsize + 1) * sizeof(wchar_t))) == NULL) {
    return NULL;
  }
  wsize = mbstowcs(wc_string, local_string, strlen(local_string) + 1);
  wc_string[wsize] = (wchar_t) 0;

  /* in case wchar_t is not zwchar */
  if ((wide_string = (zwchar *)malloc((wsize + 1) * sizeof(zwchar))) == NULL) {
    return NULL;
  }
  for (wsize = 0; wide_string[wsize] = (zwchar)wc_string[wsize]; wsize++) ;
  wide_string[wsize] = (zwchar) 0;
  free(wc_string);

  return wide_string;
}


/* convert wide string to UTF-8 */
char *wide_to_utf8_string(wide_string)
  ZCONST zwchar *wide_string;
{
  int mbcount;
  char *utf8_string;

  /* get size of utf8 string */
  mbcount = ucs4_string_to_utf8(wide_string, NULL, 0);
  if (mbcount == -1)
    return NULL;
  if ((utf8_string = (char *) malloc(mbcount + 1)) == NULL) {
    return NULL;
  }
  mbcount = ucs4_string_to_utf8(wide_string, utf8_string, mbcount + 1);
  if (mbcount == -1)
    return NULL;

  return utf8_string;
}
#endif /* unused */

/* convert UTF-8 string to wide string */
zwchar *utf8_to_wide_string(utf8_string)
  ZCONST char *utf8_string;
{
  int wcount;
  zwchar *wide_string;

  wcount = utf8_to_ucs4_string(utf8_string, NULL, 0);
  if (wcount == -1)
    return NULL;
  if ((wide_string = (zwchar *) malloc((wcount + 1) * sizeof(zwchar)))
      == NULL) {
    return NULL;
  }
  wcount = utf8_to_ucs4_string(utf8_string, wide_string, wcount + 1);

  return wide_string;
}

#endif /* UNICODE_WCHAR */
#endif /* UNICODE_SUPPORT */





#ifdef USE_EF_UT_TIME

#ifdef IZ_HAVE_UXUIDGID
static int read_ux3_value(dbuf, uidgid_sz, p_uidgid)
    ZCONST uch *dbuf;   /* buffer a uid or gid value */
    unsigned uidgid_sz; /* size of uid/gid value */
    ulg *p_uidgid;      /* return storage: uid or gid value */
{
    zusz_t uidgid64;

    switch (uidgid_sz) {
      case 2:
        *p_uidgid = (ulg)makeword(dbuf);
        break;
      case 4:
        *p_uidgid = (ulg)makelong(dbuf);
        break;
      case 8:
        uidgid64 = makeint64(dbuf);
#ifndef LARGE_FILE_SUPPORT
        if (uidgid64 == (zusz_t)0xffffffffL)
            return FALSE;
#endif
        *p_uidgid = (ulg)uidgid64;
        if ((zusz_t)(*p_uidgid) != uidgid64)
            return FALSE;
        break;
    }
    return TRUE;
}
#endif /* IZ_HAVE_UXUIDGID */


/*******************************/
/* Function ef_scan_for_izux() */
/*******************************/

unsigned ef_scan_for_izux(ef_buf, ef_len, ef_is_c, dos_mdatetime,
                          z_utim, z_uidgid)
    ZCONST uch *ef_buf; /* buffer containing extra field */
    unsigned ef_len;    /* total length of extra field */
    int ef_is_c;        /* flag indicating "is central extra field" */
    ulg dos_mdatetime;  /* last_mod_file_date_time in DOS format */
    iztimes *z_utim;    /* return storage: atime, mtime, ctime */
    ulg *z_uidgid;      /* return storage: uid and gid */
{
    unsigned flags = 0;
    unsigned eb_id;
    unsigned eb_len;
    int have_new_type_eb = 0;
    long i_time;        /* buffer for Unix style 32-bit integer time value */
#ifdef TIME_T_TYPE_DOUBLE
    int ut_in_archive_sgn = 0;
#else
    int ut_zip_unzip_compatible = FALSE;
#endif

/*---------------------------------------------------------------------------
    This function scans the extra field for EF_TIME, EF_IZUNIX2, EF_IZUNIX, or
    EF_PKUNIX blocks containing Unix-style time_t (GMT) values for the entry's
    access, creation, and modification time.
    If a valid block is found, the time stamps are copied to the iztimes
    structure (provided the z_utim pointer is not NULL).
    If a IZUNIX2 block is found or the IZUNIX block contains UID/GID fields,
    and the z_uidgid array pointer is valid (!= NULL), the owner info is
    transfered as well.
    The presence of an EF_TIME or EF_IZUNIX2 block results in ignoring all
    data from probably present obsolete EF_IZUNIX blocks.
    If multiple blocks of the same type are found, only the information from
    the last block is used.
    The return value is a combination of the EF_TIME Flags field with an
    additional flag bit indicating the presence of valid UID/GID info,
    or 0 in case of failure.
  ---------------------------------------------------------------------------*/

    if (ef_len == 0 || ef_buf == NULL || (z_utim == 0 && z_uidgid == NULL))
        return 0;

    TTrace((stderr,"\nef_scan_for_izux: scanning extra field of length %u\n",
      ef_len));

    while (ef_len >= EB_HEADSIZE) {
        eb_id = makeword(EB_ID + ef_buf);
        eb_len = makeword(EB_LEN + ef_buf);

        if (eb_len > (ef_len - EB_HEADSIZE)) {
            /* discovered some extra field inconsistency! */
            TTrace((stderr,
              "ef_scan_for_izux: block length %u > rest ef_size %u\n", eb_len,
              ef_len - EB_HEADSIZE));
            break;
        }

        switch (eb_id) {
          case EF_TIME:
            flags &= ~0x0ff;    /* ignore previous IZUNIX or EF_TIME fields */
            have_new_type_eb = 1;
            if ( eb_len >= EB_UT_MINLEN && z_utim != NULL) {
                unsigned eb_idx = EB_UT_TIME1;
                TTrace((stderr,"ef_scan_for_izux: found TIME extra field\n"));
                flags |= (ef_buf[EB_HEADSIZE+EB_UT_FLAGS] & 0x0ff);
                if ((flags & EB_UT_FL_MTIME)) {
                    if ((eb_idx+4) <= eb_len) {
                        i_time = (long)makelong((EB_HEADSIZE+eb_idx) + ef_buf);
                        eb_idx += 4;
                        TTrace((stderr,"  UT e.f. modification time = %ld\n",
                                i_time));

#ifdef TIME_T_TYPE_DOUBLE
                        if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                            if (dos_mdatetime == DOSTIME_MINIMUM) {
                              ut_in_archive_sgn = -1;
                              z_utim->mtime =
                                (time_t)((long)i_time | (~(long)0x7fffffffL));
                            } else if (dos_mdatetime >= DOSTIME_2038_01_18) {
                              ut_in_archive_sgn = 1;
                              z_utim->mtime =
                                (time_t)((ulg)i_time & (ulg)0xffffffffL);
                            } else {
                              ut_in_archive_sgn = 0;
                              /* cannot determine sign of mtime;
                                 without modtime: ignore complete UT field */
                              flags &= ~0x0ff;  /* no time_t times available */
                              TTrace((stderr,
                                "  UT modtime range error; ignore e.f.!\n"));
                              break;            /* stop scanning this field */
                            }
                        } else {
                            /* cannot determine, safe assumption is FALSE */
                            ut_in_archive_sgn = 0;
                            z_utim->mtime = (time_t)i_time;
                        }
#else /* !TIME_T_TYPE_DOUBLE */
                        if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                            ut_zip_unzip_compatible =
                              ((time_t)0x80000000L < (time_t)0L)
                              ? (dos_mdatetime == DOSTIME_MINIMUM)
                              : (dos_mdatetime >= DOSTIME_2038_01_18);
                            if (!ut_zip_unzip_compatible) {
                              /* UnZip interprets mtime differently than Zip;
                                 without modtime: ignore complete UT field */
                              flags &= ~0x0ff;  /* no time_t times available */
                              TTrace((stderr,
                                "  UT modtime range error; ignore e.f.!\n"));
                              break;            /* stop scanning this field */
                            }
                        } else {
                            /* cannot determine, safe assumption is FALSE */
                            ut_zip_unzip_compatible = FALSE;
                        }
                        z_utim->mtime = (time_t)i_time;
#endif /* ?TIME_T_TYPE_DOUBLE */
                    } else {
                        flags &= ~EB_UT_FL_MTIME;
                        TTrace((stderr,"  UT e.f. truncated; no modtime\n"));
                    }
                }
                if (ef_is_c) {
                    break;      /* central version of TIME field ends here */
                }

                if (flags & EB_UT_FL_ATIME) {
                    if ((eb_idx+4) <= eb_len) {
                        i_time = (long)makelong((EB_HEADSIZE+eb_idx) + ef_buf);
                        eb_idx += 4;
                        TTrace((stderr,"  UT e.f. access time = %ld\n",
                                i_time));
#ifdef TIME_T_TYPE_DOUBLE
                        if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                            if (ut_in_archive_sgn == -1)
                              z_utim->atime =
                                (time_t)((long)i_time | (~(long)0x7fffffffL));
                            } else if (ut_in_archive_sgn == 1) {
                              z_utim->atime =
                                (time_t)((ulg)i_time & (ulg)0xffffffffL);
                            } else {
                              /* sign of 32-bit time is unknown -> ignore it */
                              flags &= ~EB_UT_FL_ATIME;
                              TTrace((stderr,
                                "  UT access time range error: skip time!\n"));
                            }
                        } else {
                            z_utim->atime = (time_t)i_time;
                        }
#else /* !TIME_T_TYPE_DOUBLE */
                        if (((ulg)(i_time) & (ulg)(0x80000000L)) &&
                            !ut_zip_unzip_compatible) {
                            flags &= ~EB_UT_FL_ATIME;
                            TTrace((stderr,
                              "  UT access time range error: skip time!\n"));
                        } else {
                            z_utim->atime = (time_t)i_time;
                        }
#endif /* ?TIME_T_TYPE_DOUBLE */
                    } else {
                        flags &= ~EB_UT_FL_ATIME;
                    }
                }
                if (flags & EB_UT_FL_CTIME) {
                    if ((eb_idx+4) <= eb_len) {
                        i_time = (long)makelong((EB_HEADSIZE+eb_idx) + ef_buf);
                        TTrace((stderr,"  UT e.f. creation time = %ld\n",
                                i_time));
#ifdef TIME_T_TYPE_DOUBLE
                        if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                            if (ut_in_archive_sgn == -1)
                              z_utim->ctime =
                                (time_t)((long)i_time | (~(long)0x7fffffffL));
                            } else if (ut_in_archive_sgn == 1) {
                              z_utim->ctime =
                                (time_t)((ulg)i_time & (ulg)0xffffffffL);
                            } else {
                              /* sign of 32-bit time is unknown -> ignore it */
                              flags &= ~EB_UT_FL_CTIME;
                              TTrace((stderr,
                              "  UT creation time range error: skip time!\n"));
                            }
                        } else {
                            z_utim->ctime = (time_t)i_time;
                        }
#else /* !TIME_T_TYPE_DOUBLE */
                        if (((ulg)(i_time) & (ulg)(0x80000000L)) &&
                            !ut_zip_unzip_compatible) {
                            flags &= ~EB_UT_FL_CTIME;
                            TTrace((stderr,
                              "  UT creation time range error: skip time!\n"));
                        } else {
                            z_utim->ctime = (time_t)i_time;
                        }
#endif /* ?TIME_T_TYPE_DOUBLE */
                    } else {
                        flags &= ~EB_UT_FL_CTIME;
                    }
                }
            }
            break;

          case EF_IZUNIX2:
            if (have_new_type_eb == 0) {
                flags &= ~0x0ff;        /* ignore any previous IZUNIX field */
                have_new_type_eb = 1;
            }
#ifdef IZ_HAVE_UXUIDGID
            if (have_new_type_eb > 1)
                break;          /* IZUNIX3 overrides IZUNIX2 e.f. block ! */
            if (eb_len == EB_UX2_MINLEN && z_uidgid != NULL) {
                z_uidgid[0] = (ulg)makeword((EB_HEADSIZE+EB_UX2_UID) + ef_buf);
                z_uidgid[1] = (ulg)makeword((EB_HEADSIZE+EB_UX2_GID) + ef_buf);
                flags |= EB_UX2_VALID;   /* signal success */
            }
#endif
            break;

          case EF_IZUNIX3:
            /* new 3rd generation Unix ef */
            have_new_type_eb = 2;

        /*
          Version       1 byte      version of this extra field, currently 1
          UIDSize       1 byte      Size of UID field
          UID           Variable    UID for this entry
          GIDSize       1 byte      Size of GID field
          GID           Variable    GID for this entry
        */

#ifdef IZ_HAVE_UXUIDGID
            if (eb_len >= EB_UX3_MINLEN
                && z_uidgid != NULL
                && (*((EB_HEADSIZE + 0) + ef_buf) == 1)
                    /* only know about version 1 */
            {
                uch uid_size;
                uch gid_size;

                uid_size = *((EB_HEADSIZE + 1) + ef_buf);
                gid_size = *((EB_HEADSIZE + uid_size + 2) + ef_buf);

                flags &= ~0x0ff;      /* ignore any previous UNIX field */

                if ( read_ux3_value((EB_HEADSIZE + 2) + ef_buf,
                                    uid_size, z_uidgid[0])
                    &&
                     read_ux3_value((EB_HEADSIZE + uid_size + 3) + ef_buf,
                                    gid_size, z_uidgid[1]) )
                {
                    flags |= EB_UX2_VALID;   /* signal success */
                }
            }
#endif /* IZ_HAVE_UXUIDGID */
            break;

          case EF_IZUNIX:
          case EF_PKUNIX:       /* PKUNIX e.f. layout is identical to IZUNIX */
            if (eb_len >= EB_UX_MINLEN) {
                TTrace((stderr,"ef_scan_for_izux: found %s extra field\n",
                        (eb_id == EF_IZUNIX ? "IZUNIX" : "PKUNIX")));
                if (have_new_type_eb > 0) {
                    break;      /* Ignore IZUNIX extra field block ! */
                }
                if (z_utim != NULL) {
                    flags |= (EB_UT_FL_MTIME | EB_UT_FL_ATIME);
                    i_time = (long)makelong((EB_HEADSIZE+EB_UX_MTIME)+ef_buf);
                    TTrace((stderr,"  Unix EF modtime = %ld\n", i_time));
#ifdef TIME_T_TYPE_DOUBLE
                    if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                        if (dos_mdatetime == DOSTIME_MINIMUM) {
                            ut_in_archive_sgn = -1;
                            z_utim->mtime =
                              (time_t)((long)i_time | (~(long)0x7fffffffL));
                        } else if (dos_mdatetime >= DOSTIME_2038_01_18) {
                            ut_in_archive_sgn = 1;
                            z_utim->mtime =
                              (time_t)((ulg)i_time & (ulg)0xffffffffL);
                        } else {
                            ut_in_archive_sgn = 0;
                            /* cannot determine sign of mtime;
                               without modtime: ignore complete UT field */
                            flags &= ~0x0ff;    /* no time_t times available */
                            TTrace((stderr,
                                  "  UX modtime range error: ignore e.f.!\n"));
                        }
                    } else {
                        /* cannot determine, safe assumption is FALSE */
                        ut_in_archive_sgn = 0;
                        z_utim->mtime = (time_t)i_time;
                    }
#else /* !TIME_T_TYPE_DOUBLE */
                    if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                        ut_zip_unzip_compatible =
                          ((time_t)0x80000000L < (time_t)0L)
                          ? (dos_mdatetime == DOSTIME_MINIMUM)
                          : (dos_mdatetime >= DOSTIME_2038_01_18);
                        if (!ut_zip_unzip_compatible) {
                            /* UnZip interpretes mtime differently than Zip;
                               without modtime: ignore complete UT field */
                            flags &= ~0x0ff;    /* no time_t times available */
                            TTrace((stderr,
                                  "  UX modtime range error: ignore e.f.!\n"));
                        }
                    } else {
                        /* cannot determine, safe assumption is FALSE */
                        ut_zip_unzip_compatible = FALSE;
                    }
                    z_utim->mtime = (time_t)i_time;
#endif /* ?TIME_T_TYPE_DOUBLE */
                    i_time = (long)makelong((EB_HEADSIZE+EB_UX_ATIME)+ef_buf);
                    TTrace((stderr,"  Unix EF actime = %ld\n", i_time));
#ifdef TIME_T_TYPE_DOUBLE
                    if ((ulg)(i_time) & (ulg)(0x80000000L)) {
                        if (ut_in_archive_sgn == -1)
                            z_utim->atime =
                              (time_t)((long)i_time | (~(long)0x7fffffffL));
                        } else if (ut_in_archive_sgn == 1) {
                            z_utim->atime =
                              (time_t)((ulg)i_time & (ulg)0xffffffffL);
                        } else if (flags & 0x0ff) {
                            /* sign of 32-bit time is unknown -> ignore it */
                            flags &= ~EB_UT_FL_ATIME;
                            TTrace((stderr,
                                "  UX access time range error: skip time!\n"));
                        }
                    } else {
                        z_utim->atime = (time_t)i_time;
                    }
#else /* !TIME_T_TYPE_DOUBLE */
                    if (((ulg)(i_time) & (ulg)(0x80000000L)) &&
                        !ut_zip_unzip_compatible && (flags & 0x0ff)) {
                        /* atime not in range of UnZip's time_t */
                        flags &= ~EB_UT_FL_ATIME;
                        TTrace((stderr,
                                "  UX access time range error: skip time!\n"));
                    } else {
                        z_utim->atime = (time_t)i_time;
                    }
#endif /* ?TIME_T_TYPE_DOUBLE */
                }
#ifdef IZ_HAVE_UXUIDGID
                if (eb_len >= EB_UX_FULLSIZE && z_uidgid != NULL) {
                    z_uidgid[0] = makeword((EB_HEADSIZE+EB_UX_UID) + ef_buf);
                    z_uidgid[1] = makeword((EB_HEADSIZE+EB_UX_GID) + ef_buf);
                    flags |= EB_UX2_VALID;
                }
#endif /* IZ_HAVE_UXUIDGID */
            }
            break;

          default:
            break;
        }

        /* Skip this extra field block */
        ef_buf += (eb_len + EB_HEADSIZE);
        ef_len -= (eb_len + EB_HEADSIZE);
    }