unix.c

压缩解压,是unzip540的升级,这个外国网站摘来的源码,是evb编写.

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

    if (FUNCTION == INIT) {
        Trace((stderr, "initializing buildpath to "));
#ifdef ACORN_FTYPE_NFS
        if ((G.buildpath = (char *)malloc(strlen(G.filename)+G.rootlen+
                                          (uO.acorn_nfs_ext ? 5 : 1)))
#else
        if ((G.buildpath = (char *)malloc(strlen(G.filename)+G.rootlen+1))
#endif
            == (char *)NULL)
            return MPN_NOMEM;
        if ((G.rootlen > 0) && !G.renamed_fullpath) {
            strcpy(G.buildpath, G.rootpath);
            G.end = G.buildpath + G.rootlen;
        } else {
            *G.buildpath = '\0';
            G.end = G.buildpath;
        }
        Trace((stderr, "[%s]\n", FnFilter1(G.buildpath)));
        return MPN_OK;
    }

/*---------------------------------------------------------------------------
    ROOT:  if appropriate, store the path in rootpath and create it if
    necessary; 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",
          FnFilter1(pathcomp)));
        if (pathcomp == (char *)NULL) {
            G.rootlen = 0;
            return MPN_OK;
        }
        if (G.rootlen > 0)      /* rootpath was already set, nothing to do */
            return MPN_OK;
        if ((G.rootlen = strlen(pathcomp)) > 0) {
            char *tmproot;

            if ((tmproot = (char *)malloc(G.rootlen+2)) == (char *)NULL) {
                G.rootlen = 0;
                return MPN_NOMEM;
            }
            strcpy(tmproot, pathcomp);
            if (tmproot[G.rootlen-1] == '/') {
                tmproot[--G.rootlen] = '\0';
            }
            if (G.rootlen > 0 && (SSTAT(tmproot, &G.statbuf) ||
                                  !S_ISDIR(G.statbuf.st_mode)))
            {   /* path does not exist */
                if (!G.create_dirs /* || iswild(tmproot) */ ) {
                    free(tmproot);
                    G.rootlen = 0;
                    /* skip (or treat as stored file) */
                    return MPN_INF_SKIP;
                }
                /* create the directory (could add loop here scanning tmproot
                 * to create more than one level, but why really necessary?) */
                if (mkdir(tmproot, 0777) == -1) {
                    Info(slide, 1, ((char *)slide,
                      "checkdir:  cannot create extraction directory: %s\n",
                      FnFilter1(tmproot)));
                    free(tmproot);
                    G.rootlen = 0;
                    /* path didn't exist, tried to create, and failed: */
                    /* file exists, or 2+ subdir levels required */
                    return MPN_ERR_SKIP;
                }
            }
            tmproot[G.rootlen++] = '/';
            tmproot[G.rootlen] = '\0';
            if ((G.rootpath = (char *)realloc(tmproot, G.rootlen+1)) == NULL) {
                free(tmproot);
                G.rootlen = 0;
                return MPN_NOMEM;
            }
            Trace((stderr, "rootpath now = [%s]\n", FnFilter1(G.rootpath)));
        }
        return MPN_OK;
    }
#endif /* !SFX || SFX_EXDIR */

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

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

    return MPN_INVALID; /* should never reach */

} /* end function checkdir() */





#ifdef NO_MKDIR

/********************/
/* Function mkdir() */
/********************/

int mkdir(path, mode)
    ZCONST char *path;
    int mode;   /* ignored */
/*
 * returns:   0 - successful
 *           -1 - failed (errno not set, however)
 */
{
    char command[FILNAMSIZ+40]; /* buffer for system() call */

    /* GRR 930416:  added single quotes around path to avoid bug with
     * creating directories with ampersands in name; not yet tested */
    sprintf(command, "IFS=\" \t\n\" /bin/mkdir '%s' 2>/dev/null", path);
    if (system(command))
        return -1;
    return 0;
}

#endif /* NO_MKDIR */




#if (!defined(MTS) || defined(SET_DIR_ATTRIB))
static int get_extattribs OF((__GPRO__ iztimes *pzt, ush z_uidgid[2]));

static int get_extattribs(__G__ pzt, z_uidgid)
    __GDEF
    iztimes *pzt;
    ush z_uidgid[2];
{
/*---------------------------------------------------------------------------
    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.  On the other hand, we
    then have to check for restoration of UID/GID.
  ---------------------------------------------------------------------------*/
    int have_uidgid_flg;
    unsigned eb_izux_flg;

    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 ? pzt : NULL),
#else
                   pzt,
#endif
                   z_uidgid) : 0);
    if (eb_izux_flg & EB_UT_FL_MTIME) {
        TTrace((stderr, "\nget_extattribs:  Unix e.f. modif. time = %ld\n",
          pzt->mtime));
    } else {
        pzt->mtime = dos_to_unix_time(G.lrec.last_mod_dos_datetime);
    }
    if (eb_izux_flg & EB_UT_FL_ATIME) {
        TTrace((stderr, "get_extattribs:  Unix e.f. access time = %ld\n",
          pzt->atime));
    } else {
        pzt->atime = pzt->mtime;
        TTrace((stderr, "\nget_extattribs:  modification/access times = %ld\n",
          pzt->mtime));
    }

    /* if -X option was specified and we have UID/GID info, restore it */
    have_uidgid_flg =
#ifdef RESTORE_UIDGID
            (uO.X_flag && (eb_izux_flg & EB_UX2_VALID));
#else
            0;
#endif
    return have_uidgid_flg;
}
#endif /* !MTS || SET_DIR_ATTRIB */



#ifndef MTS

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

void close_outfile(__G)    /* GRR: change to return PK-style warning level */
    __GDEF
{
    union {
        iztimes t3;             /* mtime, atime, ctime */
        ztimbuf t2;             /* modtime, actime */
    } zt;
    ush z_uidgid[2];
    int have_uidgid_flg;

    fclose(G.outfile);

/*---------------------------------------------------------------------------
    If symbolic links are supported, allocate storage for a symlink control
    structure, put the uncompressed "data" and other required info in it, and
    add the structure to the "deferred symlinks" chain.  Since we know it's a
    symbolic link to start with, we shouldn't have to worry about overflowing
    unsigned ints with unsigned longs.
  ---------------------------------------------------------------------------*/

#ifdef SYMLINKS
    if (G.symlnk) {
        unsigned ucsize = (unsigned)G.lrec.ucsize;
        extent slnk_entrysize = sizeof(slinkentry) + ucsize +
                                strlen(G.filename);
        slinkentry *slnk_entry;

        if ((unsigned)slnk_entrysize < ucsize) {
            Info(slide, 0x201, ((char *)slide,
              "warning:  symbolic link (%s) failed: mem alloc overflow\n",
              FnFilter1(G.filename)));
            return;
        }

        if ((slnk_entry = (slinkentry *)malloc(slnk_entrysize)) == NULL) {
            Info(slide, 0x201, ((char *)slide,
              "warning:  symbolic link (%s) failed: no mem\n",
              FnFilter1(G.filename)));
            return;
        }
        slnk_entry->next = NULL;
        slnk_entry->targetlen = ucsize;
        slnk_entry->attriblen = 0;      /* don't set attributes for symlinks */
        slnk_entry->target = slnk_entry->buf;
        slnk_entry->fname = slnk_entry->target + ucsize + 1;
        strcpy(slnk_entry->fname, G.filename);

        /* reopen the "link data" file for reading */
        G.outfile = fopen(G.filename, FOPR);

        if (!G.outfile ||
            fread(slnk_entry->target, 1, ucsize, G.outfile) != (int)ucsize)
        {
            Info(slide, 0x201, ((char *)slide,
              "warning:  symbolic link (%s) failed\n",
              FnFilter1(G.filename)));
            free(slnk_entry);
            fclose(G.outfile);
            return;
        }
        fclose(G.outfile);                  /* close "link" file for good... */
        slnk_entry->target[ucsize] = '\0';
        if (QCOND2)
            Info(slide, 0, ((char *)slide, "-> %s ",
              FnFilter1(slnk_entry->target)));
        /* add this symlink record to the list of deferred symlinks */
        if (G.slink_last != NULL)
            G.slink_last->next = slnk_entry;
        else
            G.slink_head = slnk_entry;
        G.slink_last = slnk_entry;
        return;
    }
#endif /* SYMLINKS */

#ifdef QLZIP
    if (G.extra_field) {
        static void qlfix OF((__GPRO__ uch *ef_ptr, unsigned ef_len));

        qlfix(__G__ G.extra_field, G.lrec.extra_field_length);
    }
#endif

    have_uidgid_flg = get_extattribs(__G__ &(zt.t3), z_uidgid);

    /* if -X option was specified and we have UID/GID info, restore it */
    if (have_uidgid_flg) {
        TTrace((stderr, "close_outfile:  restoring Unix UID/GID info\n"));
        if (chown(G.filename, (uid_t)z_uidgid[0], (gid_t)z_uidgid[1]))
        {
            if (uO.qflag)
                Info(slide, 0x201, ((char *)slide,
                  "warning:  cannot set UID %d and/or GID %d for %s\n",
                  z_uidgid[0], z_uidgid[1], FnFilter1(G.filename)));
            else
                Info(slide, 0x201, ((char *)slide,
                  " (warning) cannot set UID %d and/or GID %d",
                  z_uidgid[0], z_uidgid[1]));
        }
    }

    /* set the file's access and modification times */
    if (utime(G.filename, &(zt.t2))) {
#ifdef AOS_VS
        if (uO.qflag)
            Info(slide, 0x201, ((char *)slide, "... cannot set time for %s\n",
              FnFilter1(G.filename)));
        else
            Info(slide, 0x201, ((char *)slide, "... cannot set time"));
#else
        if (uO.qflag)
            Info(slide, 0x201, ((char *)slide,
              "warning:  cannot set times for %s\n", FnFilter1(G.filename)));
        else
            Info(slide, 0x201, ((char *)slide,
              " (warning) cannot set times"));
#endif /* ?AOS_VS */
    }

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

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

} /* end function close_outfile() */

#endif /* !MTS */


#ifdef SET_DIR_ATTRIB
/* messages of code for setting directory attributes */
static ZCONST char Far DirlistUidGidFailed[] =
  "warning:  cannot set UID %d and/or GID %d for %s\n";
static ZCONST char Far DirlistUtimeFailed[] =
  "warning:  cannot set modification, access times for %s\n";
#  ifndef NO_CHMOD
  static ZCONST char Far DirlistChmodFailed[] =
    "warning:  cannot set permissions for %s\n";
#  endif


int defer_dir_attribs(__G__ pd)
    __GDEF
    direntry **pd;
{
    uxdirattr *d_entry;

    d_entry = (uxdirattr *)malloc(sizeof(uxdirattr) + strlen(G.filename));
    *pd = (direntry *)d_entry;
    if (d_entry == (uxdirattr *)NULL) {
        return PK_MEM;
    }
    d_entry->fn = d_entry->fnbuf;
    strcpy(d_entry->fn, G.filename);

    d_entry->perms = G.pInfo->file_attr;

    d_entry->have_uidgid = get_extattribs(__G__ &(d_entry->u.t3),
                                          d_entry->uidgid);
    return PK_OK;
} /* end function defer_dir_attribs() */


int set_direc_attribs(__G__ d)
    __GDEF
    direntry *d;
{
    int errval = PK_OK;

    if (UxAtt(d)->have_uidgid &&
        chown(UxAtt(d)->fn, (uid_t)UxAtt(d)->uidgid[0],
              (gid_t)UxAtt(d)->uidgid[1]))
    {
        Info(slide, 0x201, ((char *)slide,
          LoadFarString(DirlistUidGidFailed),
          UxAtt(d)->uidgid[0], UxAtt(d)->uidgid[1], FnFilter1(d->fn)));
        if (!errval)
            errval = PK_WARN;
    }
    if (utime(d->fn, &UxAtt(d)->u.t2)) {
        Info(slide, 0x201, ((char *)slide,
          LoadFarString(DirlistUtimeFailed), FnFilter1(d->fn)));
        if (!errval)
            errval = PK_WARN;
    }
#ifndef NO_CHMOD
    if (chmod(d->fn, filtattr(__G__ UxAtt(d)->perms))) {
        Info(slide, 0x201, ((char *)slide,
          LoadFarString(DirlistChmodFailed), FnFilter1(d->fn)));
        /* perror("chmod (file attributes) error"); */
        if (!errval)
            errval = PK_WARN;
    }
#endif /* !NO_CHMOD */
    return errval;
} /* end function set_direc_attribs() */

#endif /* SET_DIR_ATTRIB */




#ifdef TIMESTAMP

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

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

    tp.modtime = tp.actime = modtime;