msdos.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.

    if (have_dirname) {
        /* strcpy(matchname, dirname); */
        fnamestart = matchname + dirnamelen;
    } else
        fnamestart = matchname;
    while ((file = Readdir(wild_dir)) != (struct zdirent *)NULL) {
        Trace((stderr, "do_wild:  readdir returns %s\n",
          FnFilter1(file->d_name)));
        strcpy(fnamestart, file->d_name);
        if (strrchr(fnamestart, '.') == (char *)NULL)
            strcat(fnamestart, ".");
        if (match(fnamestart, wildname, 1 WISEP)) { /* 1 == ignore case */
            Trace((stderr, "do_wild:  match() succeeds\n"));
            /* remove trailing dot */
            fnamestart += strlen(fnamestart) - 1;
            if (*fnamestart == '.')
                *fnamestart = '\0';
            return matchname;
        }
    }

    Closedir(wild_dir);     /* have read at least one entry; nothing left */
    wild_dir = (zDIR *)NULL;
    notfirstcall = FALSE;   /* reset for new wildspec */
    if (have_dirname)
        free(dirname);
    return (char *)NULL;

} /* end function do_wild() */

#endif /* !SFX */




/**********************/
/* Function mapattr() */
/**********************/

int mapattr(__G)
    __GDEF
{
    /* set archive bit for file entries (file is not backed up): */
    G.pInfo->file_attr = ((unsigned)G.crec.external_file_attributes |
      (G.crec.external_file_attributes & FSUBDIR ? 0 : 32)) & 0xff;
    return 0;

} /* end function mapattr() */





/************************/
/*  Function mapname()  */
/************************/

int mapname(__G__ renamed)
    __GDEF
    int renamed;
/*
 * returns:
 *  MPN_OK          - no problem detected
 *  MPN_INF_TRUNC   - caution (truncated filename)
 *  MPN_INF_SKIP    - info "skip entry" (dir doesn't exist)
 *  MPN_ERR_SKIP    - error -> skip entry
 *  MPN_ERR_TOOLONG - error -> path is too long
 *  MPN_NOMEM       - error (memory allocation failed) -> skip entry
 *  [also MPN_VOL_LABEL, MPN_CREATED_DIR]
 */
{
    char pathcomp[FILNAMSIZ];      /* path-component buffer */
    char *pp, *cp=(char *)NULL;    /* character pointers */
    char *lastsemi=(char *)NULL;   /* pointer to last semi-colon in pathcomp */
#ifdef MAYBE_PLAIN_FAT
    char *last_dot=(char *)NULL;   /* last dot not converted to underscore */
# ifdef USE_LFN
    int use_lfn = USE_LFN;         /* file system supports long filenames? */
# endif
#endif
    int killed_ddot = FALSE;       /* is set when skipping "../" pathcomp */
    int error = MPN_OK;
    register unsigned workch;      /* hold the character being tested */


/*---------------------------------------------------------------------------
    Initialize various pointers and counters and stuff.
  ---------------------------------------------------------------------------*/

    /* can create path as long as not just freshening, or if user told us */
    G.create_dirs = (!uO.fflag || renamed);

    created_dir = FALSE;        /* not yet */
    renamed_fullpath = FALSE;

    if (renamed) {
        cp = G.filename - 1;    /* point to beginning of renamed name... */
        while (*++cp)
            if (*cp == '\\')    /* convert backslashes to forward */
                *cp = '/';
        cp = G.filename;
        /* use temporary rootpath if user gave full pathname */
        if (G.filename[0] == '/') {
            renamed_fullpath = TRUE;
            pathcomp[0] = '/';  /* copy the '/' and terminate */
            pathcomp[1] = '\0';
            ++cp;
        } else if (isalpha((uch)G.filename[0]) && G.filename[1] == ':') {
            renamed_fullpath = TRUE;
            pp = pathcomp;
            *pp++ = *cp++;      /* copy the "d:" (+ '/', possibly) */
            *pp++ = *cp++;
            if (*cp == '/')
                *pp++ = *cp++;  /* otherwise add "./"? */
            *pp = '\0';
        }
    }

    /* pathcomp is ignored unless renamed_fullpath is TRUE: */
    if ((error = checkdir(__G__ pathcomp, INIT)) != 0) /* initialize path buf */
        return error;           /* ...unless no mem or vol label on hard disk */

    *pathcomp = '\0';           /* initialize translation buffer */
    pp = pathcomp;              /* point to translation buffer */
    if (!renamed) {             /* cp already set if renamed */
        if (uO.jflag)           /* junking directories */
            cp = (char *)strrchr(G.filename, '/');
        if (cp == (char *)NULL) /* no '/' or not junking dirs */
            cp = G.filename;    /* point to internal zipfile-member pathname */
        else
            ++cp;               /* point to start of last component of path */
    }

/*---------------------------------------------------------------------------
    Begin main loop through characters in filename.
  ---------------------------------------------------------------------------*/

    while ((workch = (uch)*cp++) != 0) {

        switch (workch) {
            case '/':             /* can assume -j flag not given */
                *pp = '\0';
#ifdef MAYBE_PLAIN_FAT
                maskDOSdevice(__G__ pathcomp, last_dot);
#else
                maskDOSdevice(__G__ pathcomp, NULL);
#endif
#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
                if (!use_lfn)
# endif
                {
                    map2fat(pathcomp, last_dot);   /* 8.3 trunc. (in place) */
                    last_dot = (char *)NULL;
                }
#endif
                if (strcmp(pathcomp, ".") == 0) {
                    /* don't bother appending "./" to the path */
                    *pathcomp = '\0';
                } else if (!uO.ddotflag && strcmp(pathcomp, "..") == 0) {
                    /* "../" dir traversal detected, skip over it */
                    *pathcomp = '\0';
                    killed_ddot = TRUE;     /* set "show message" flag */
                }
                /* when path component is not empty, append it now */
                if (*pathcomp != '\0' &&
                    ((error = checkdir(__G__ pathcomp, APPEND_DIR))
                     & MPN_MASK) > MPN_INF_TRUNC)
                    return error;
                pp = pathcomp;    /* reset conversion buffer for next piece */
                lastsemi = (char *)NULL; /* leave direct. semi-colons alone */
                break;

#ifdef MAYBE_PLAIN_FAT
            case '.':
# ifdef USE_LFN
                if (use_lfn) {          /* LFN filenames may contain many */
                    *pp++ = '.';        /*  dots, so simply copy it ... */
                } else
# endif
                if (pp == pathcomp && *cp == '.' && cp[1] == '/') {
                    /* nothing appended yet.., and found "../" */
                    *pp++ = '.';        /*  add first dot, */
                    *pp++ = '.';        /*  second dot, and */
                    ++cp;               /*  skip over to the '/' */
                } else {                /* found dot within path component */
                    last_dot = pp;      /*  point at last dot so far... */
                    *pp++ = '_';        /*  convert to underscore for now */
                }
                break;
#endif /* MAYBE_PLAIN_FAT */

            /* drive names are not stored in zipfile, so no colons allowed;
             *  no brackets or most other punctuation either (all of which
             *  can appear in Unix-created archives; backslash is particularly
             *  bad unless all necessary directories exist) */
#ifdef MAYBE_PLAIN_FAT
            case '[':          /* these punctuation characters forbidden */
            case ']':          /*  only on plain FAT file systems */
            case '+':
            case ',':
            case '=':
# ifdef USE_LFN
                if (use_lfn)
                    *pp++ = (char)workch;
                else
                    *pp++ = '_';
                break;
# endif
#endif
            case ':':           /* special shell characters of command.com */
            case '\\':          /*  (device and directory limiters, wildcard */
            case '"':           /*  characters, stdin/stdout redirection and */
            case '<':           /*  pipe indicators and the quote sign) are */
            case '>':           /*  never allowed in filenames on (V)FAT */
            case '|':
            case '*':
            case '?':
                *pp++ = '_';
                break;

            case ';':             /* start of VMS version? */
                lastsemi = pp;
#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
                if (use_lfn)
                    *pp++ = ';';  /* keep for now; remove VMS ";##" later */
# endif
#else
                *pp++ = ';';      /* keep for now; remove VMS ";##" later */
#endif
                break;

#ifdef MAYBE_PLAIN_FAT
            case ' ':                      /* change spaces to underscores */
# ifdef USE_LFN
                if (!use_lfn && uO.sflag)  /*  only if requested and NO lfn! */
# else
                if (uO.sflag)              /*  only if requested */
# endif
                    *pp++ = '_';
                else
                    *pp++ = (char)workch;
                break;
#endif /* MAYBE_PLAIN_FAT */

            default:
                /* allow ASCII 255 and European characters in filenames: */
                if (isprint(workch) || workch >= 127)
                    *pp++ = (char)workch;

        } /* end switch */
    } /* end while loop */

    /* Show warning when stripping insecure "parent dir" path components */
    if (killed_ddot && QCOND2) {
        Info(slide, 0, ((char *)slide, LoadFarString(WarnDirTraversSkip),
          FnFilter1(G.filename)));
        if (!(error & ~MPN_MASK))
            error = (error & MPN_MASK) | PK_WARN;
    }

/*---------------------------------------------------------------------------
    Report if directory was created (and no file to create:  filename ended
    in '/'), check name to be sure it exists, and combine path and name be-
    fore exiting.
  ---------------------------------------------------------------------------*/

    if (G.filename[strlen(G.filename) - 1] == '/') {
        checkdir(__G__ G.filename, GETPATH);
        if (created_dir) {
            if (QCOND2) {
                Info(slide, 0, ((char *)slide, LoadFarString(Creating),
                  FnFilter1(G.filename)));
            }

            /* set file attributes: */
            z_dos_chmod(__G__ G.filename, G.pInfo->file_attr);

            /* set dir time (note trailing '/') */
            return (error & ~MPN_MASK) | MPN_CREATED_DIR;
        } else if (IS_OVERWRT_ALL) {
            /* overwrite attributes of existing directory on user's request */

            /* set file attributes: */
            z_dos_chmod(__G__ G.filename, G.pInfo->file_attr);
        }
        /* dir existed already; don't look for data to extract */
        return (error & ~MPN_MASK) | MPN_INF_SKIP;
    }

    *pp = '\0';                   /* done with pathcomp:  terminate it */

    /* if not saving them, remove VMS version numbers (appended ";###") */
    if (!uO.V_flag && lastsemi) {
#ifndef MAYBE_PLAIN_FAT
        pp = lastsemi + 1;
#else
# ifdef USE_LFN
        if (use_lfn)
            pp = lastsemi + 1;
        else
            pp = lastsemi;        /* semi-colon was omitted:  expect all #'s */
# else
        pp = lastsemi;            /* semi-colon was omitted:  expect all #'s */
# endif
#endif
        while (isdigit((uch)(*pp)))
            ++pp;
        if (*pp == '\0')          /* only digits between ';' and end:  nuke */
            *lastsemi = '\0';
    }

#ifdef MAYBE_PLAIN_FAT
    maskDOSdevice(__G__ pathcomp, last_dot);
#else
    maskDOSdevice(__G__ pathcomp, NULL);
#endif

    if (G.pInfo->vollabel) {
        if (strlen(pathcomp) > 11)
            pathcomp[11] = '\0';
    } else {
#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
        if (!use_lfn)
            map2fat(pathcomp, last_dot);  /* 8.3 truncation (in place) */
# else
        map2fat(pathcomp, last_dot);  /* 8.3 truncation (in place) */
# endif
#endif
    }

    if (*pathcomp == '\0') {
        Info(slide, 1, ((char *)slide, LoadFarString(ConversionFailed),
          FnFilter1(G.filename)));
        return (error & ~MPN_MASK) | MPN_ERR_SKIP;
    }

    checkdir(__G__ pathcomp, APPEND_NAME);  /* returns 1 if truncated: care? */
    checkdir(__G__ G.filename, GETPATH);

    if (G.pInfo->vollabel) {    /* set the volume label now */
        if (QCOND2)
            Info(slide, 0, ((char *)slide, LoadFarString(Labelling),
              (nLabelDrive + 'a' - 1),
              FnFilter1(G.filename)));
        if (volumelabel(G.filename)) {
            Info(slide, 1, ((char *)slide, LoadFarString(ErrSetVolLabel)));
            return (error & ~MPN_MASK) | MPN_ERR_SKIP;
        }
        /* success:  skip the "extraction" quietly */
        return (error & ~MPN_MASK) | MPN_INF_SKIP;
    }

    return error;

} /* end function mapname() */





/****************************/
/* Function maskDOSdevice() */