qdos.c

完整的解压zip文件的源码。包含密码功能

                Info(slide, 0x201, ((char *)slide,
                  "checkdir warning:  path too long; truncating\n\
                   %s\n                -> %s\n", G.filename, buildpath));
                return 1;   /* filename truncated */
            }
        }
        Trace((stderr, "buildpath now = [%s]\n", buildpath));
        return 0;  /* could check for existence here, prompt for new name... */
    }

/*---------------------------------------------------------------------------
    INIT:  allocate and initialize buffer space for the file currently being
    extracted.  If file was renamed with an absolute path, don't prepend the
    extract-to path.
  ---------------------------------------------------------------------------*/

/* GRR:  for VMS and TOPS-20, add up to 13 to strlen */

    if (FUNCTION == INIT) {
        Trace((stderr, "initializing buildpath to "));
        if ((buildpath = (char *)malloc(strlen(G.filename)+rootlen+1)) ==
            (char *)NULL)
            return 10;
        if ((rootlen > 0) && !renamed_fullpath) {
            strcpy(buildpath, rootpath);
            end = buildpath + rootlen;
        } else {
            *buildpath = '\0';
            end = buildpath;
        }
        Trace((stderr, "[%s]\n", buildpath));
        return 0;
    }

/*---------------------------------------------------------------------------
    ROOT:  if appropriate, store the path in rootpath and create it if neces-
    sary; else assume it's a zipfile member and return.  This path segment
    gets used in extracting all members from every zipfile specified on the
    command line.
  ---------------------------------------------------------------------------*/

#if (!defined(SFX) || defined(SFX_EXDIR))
    if (FUNCTION == ROOT) {
        Trace((stderr, "initializing root path to [%s]\n", pathcomp));
        if (pathcomp == (char *)NULL) {
            rootlen = 0;
            return 0;
        }
        if ((rootlen = strlen(pathcomp)) > 0) {

            if (rootlen > 0 && (stat(pathcomp, &G.statbuf) ||
                !S_ISDIR(G.statbuf.st_mode)))          /* path does not exist */
            {
                if (!G.create_dirs                     /* || iswild(pathcomp) */
#ifdef OLD_EXDIR
                                 || !had_trailing_pathsep
#endif
                                                         ) {
                    rootlen = 0;
                    return 2;   /* skip (or treat as stored file) */
                }
                /* create the directory (could add loop here to scan pathcomp
                 * and create more than one level, but why really necessary?) */

                if (mkdir(pathcomp, 0777) == -1) {
                    Info(slide, 1, ((char *)slide,
                      "checkdir:  cannot create extraction directory: %s\n",
                      pathcomp));
                    rootlen = 0;   /* path didn't exist, tried to create, and */
                    return 3;  /* failed:  file exists, or 2+ levels required */
                }
            }
            if (pathcomp[rootlen-1] == '/' || pathcomp[rootlen-1] == '_') {
                pathcomp[--rootlen] = '\0';
            }
            if ((rootpath = (char *)malloc(rootlen+2)) == (char *)NULL) {
                rootlen = 0;
                return 10;
            }
            strcpy(rootpath, pathcomp);
            rootpath[rootlen++] = '_';
            rootpath[rootlen] = '\0';
        }
        Trace((stderr, "rootpath now = [%s]\n", rootpath));
        return 0;
    }
#endif /* !SFX || SFX_EXDIR */

/*---------------------------------------------------------------------------
    END:  free rootpath, immediately prior to program exit.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == END) {
        Trace((stderr, "freeing rootpath\n"));
        if (rootlen > 0) {
            free(rootpath);
            rootlen = 0;
        }
        return 0;
    }

    return 99;  /* should never reach */

} /* end function checkdir() */


static void qfix(__G__ ef_ptr, ef_len)
    __GDEF
    uch *ef_ptr;
    unsigned ef_len;
{
    qdosextra qextra;

    while (ef_len >= EB_HEADSIZE)
    {
        qdosextra   *extra = &qextra;
        jbextra     *jbp   = (jbextra *)&qextra;
        unsigned    eb_len = makeword(EB_LEN + ef_ptr);

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

        /* Must ensure that we don't use ODD addresses here */

        memcpy(&qextra, ef_ptr, sizeof(qdosextra));
        switch (extra->shortid) {
          case SHORTID:
            if (!strncmp(extra->longid, LONGID, strlen(LONGID)))
            {
                if (eb_len != EXTRALEN)
                    fputs("warning: invalid length in Qdos field", stderr);
                if (extra->header.d_type)
                {
                    fs_heads(fgetchid(G.outfile), (timeout_t)-1,
                             &extra->header, 14);
                    G.pInfo->file_attr |= S_IXUSR;
                }
            }

            if (!strncmp(jbp->longid, JBLONGID, strlen(JBLONGID)))
            {
                if (eb_len != JBEXTRALEN)
                    fputs("warning: invalid length in QZ field", stderr);
                if (jbp->header.d_type)
                {
                    fs_heads(fgetchid(G.outfile), (timeout_t)-1,
                             &jbp->header, 14);
                    G.pInfo->file_attr |= S_IXUSR;
                }
            }
            break;

          default:
            Trace((stderr,"qfix: unknown extra field block, ID=%d\n",
               extra->shortid));
            break;
        }

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


#ifdef QDOS
#  include <utime.h>
   long timezone = 0;
#endif


/****************************/
/* Function close_outfile() */
/****************************/

void close_outfile(__G)
    __GDEF
{
    iztimes zt;
#ifdef USE_EF_UT_TIME
    unsigned eb_izux_flg;
#endif

    if (G.extra_field) {
        qfix(__G__ G.extra_field, G.lrec.extra_field_length);
    }

    fclose(G.outfile);

/*---------------------------------------------------------------------------
    Change the file permissions from default ones to those stored in the
    zipfile.
  ---------------------------------------------------------------------------*/

#ifndef NO_CHMOD
    if (chmod(G.filename, 0xffff & G.pInfo->file_attr))
        perror("chmod (file attributes) error");
#endif

/*---------------------------------------------------------------------------
    Convert from MSDOS-format local time and date to Unix-format 32-bit GMT
    time:  adjust base year from 1980 to 1970, do usual conversions from
    yy/mm/dd hh:mm:ss to elapsed seconds, and account for timezone and day-
    light savings time differences.  If we have a Unix extra field, however,
    we're laughing:  both mtime and atime are ours.
  ---------------------------------------------------------------------------*/

#ifdef USE_EF_UT_TIME
    eb_izux_flg = (G.extra_field ? ef_scan_for_izux(G.extra_field,
                   G.lrec.extra_field_length, 0, G.lrec.last_mod_dos_datetime,
#ifdef IZ_CHECK_TZ
                   (G.tz_is_valid ? &zt : NULL),
#else
                   &zt,
#endif
                   z_uidgid) : 0);
    if (eb_izux_flg & EB_UT_FL_MTIME) {
        TTrace((stderr, "\nclose_outfile:  Unix e.f. modif. time = %ld\n",
          zt.mtime));
    } else {
        zt.mtime = dos_to_unix_time(G.lrec.last_mod_dos_datetime);
    }
    if (eb_izux_flg & EB_UT_FL_ATIME) {
        TTrace((stderr, "close_outfile:  Unix e.f. access time = %ld\n",
          zt.atime));
    } else {
        zt.atime = zt.mtime;

        TTrace((stderr, "\nclose_outfile:  modification/access times = %ld\n",
          zt.mtime));
    }
#else
    zt.atime = zt.mtime = dos_to_unix_time(G.lrec.last_mod_dos_datetime);
#endif

    /* set the file's access and modification times */
    if (utime(G.filename, (struct utimbuf *)&zt)) {
        Info(slide, 0x201, ((char *)slide,
          "warning:  cannot set the time for %s\n", G.filename));
    }

} /* end function close_outfile() */




#ifdef TIMESTAMP

/***************************/
/*  Function stamp_file()  */
/***************************/

int stamp_file(fname, modtime)
    ZCONST char *fname;
    time_t modtime;
{
    struct utimbuf tp;

    tp.modtime = tp.actime = modtime;
    return (utime(fname, &tp));

} /* end function stamp_file() */

#endif /* TIMESTAMP */




#ifndef SFX

/************************/
/*  Function version()  */
/************************/

void version(__G)
    __GDEF
{

    sprintf((char *)slide, LoadFarString(CompiledWith),
           "c68", " v4.2x", "SMS/QDOS",
            " on ", __DATE__, "","");
    (*G.message)((zvoid *)&G, slide, (ulg)strlen((char *)slide), 0);

} /* end function version() */

#endif /* !SFX */
#endif /* !FUNZIP */

#if CRYPT

char *getp(__G__ m, p, n)
    __GDEF
    const char *m;              /* prompt for password */
    char *p;                    /* return value: line input */
    int n;                      /* bytes available in p[] */
{
    int c;                      /* one-byte buffer for read() to use */
    int i;                      /* number of characters input */
    char *w;                    /* warning on retry */

    /* get password */
    w = "";
    sd_cure(getchid(0), -1);    /* enable cursor */
    do {
        fputs(w, stderr);       /* warning if back again */
        fputs(m, stderr);       /* display prompt and flush */
        fflush(stderr);
        i = 0;
        do {
            c = getch();
            if (c == 0xc2) {
                if (i > 0) {
                    i--; /* the `del' keys works */
                    fputs("\b \b", stderr);
                }
            }
            else if (i < n) {
                p[i++] = c;     /* truncate past n */
                if(c != '\n') putc('*', stderr);
            }
        } while (c != '\n');

        putc('\n', stderr);  fflush(stderr);
        w = "(line too long--try again)\n";
    } while (p[i-1] != '\n');

    p[i-1] = 0;                 /* terminate at newline */
    sd_curs(getchid(0), -1);    /* suppress cursor */
    return p;                   /* return pointer to password */

} /* end function getp() */

#endif /* CRYPT */