beos.c

完整的解压zip文件的源码。包含密码功能

    if (*pathcomp == '\0') {
        Info(slide, 1, ((char *)slide, "mapname:  conversion of %s failed\n",
          G.filename));
        return 3;
    }

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

    return error;

} /* end function mapname() */





/***********************/
/* Function checkdir() */
/***********************/

int checkdir(__G__ pathcomp, flag)
    __GDEF
    char *pathcomp;
    int flag;
/*
 * returns:  1 - (on APPEND_NAME) truncated filename
 *           2 - path doesn't exist, not allowed to create
 *           3 - path doesn't exist, tried to create and failed; or
 *               path exists and is not a directory, but is supposed to be
 *           4 - path is too long
 *          10 - can't allocate memory for filename buffers
 */
{
    static int rootlen = 0;   /* length of rootpath */
    static char *rootpath;    /* user's "extract-to" directory */
    static char *buildpath;   /* full path (so far) to extracted file */
    static char *end;         /* pointer to end of buildpath ('\0') */

#   define FN_MASK   7
#   define FUNCTION  (flag & FN_MASK)



/*---------------------------------------------------------------------------
    APPEND_DIR:  append the path component to the path being built and check
    for its existence.  If doesn't exist and we are creating directories, do
    so for this one; else signal success or error as appropriate.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == APPEND_DIR) {
        int too_long = FALSE;
#ifdef SHORT_NAMES
        char *old_end = end;
#endif

        Trace((stderr, "appending dir segment [%s]\n", pathcomp));
        while ((*end = *pathcomp++) != '\0')
            ++end;
#ifdef SHORT_NAMES   /* path components restricted to 14 chars, typically */
        if ((end-old_end) > FILENAME_MAX)  /* GRR:  proper constant? */
            *(end = old_end + FILENAME_MAX) = '\0';
#endif

        /* GRR:  could do better check, see if overrunning buffer as we go:
         * check end-buildpath after each append, set warning variable if
         * within 20 of FILNAMSIZ; then if var set, do careful check when
         * appending.  Clear variable when begin new path. */

        if ((end-buildpath) > FILNAMSIZ-3)  /* need '/', one-char name, '\0' */
            too_long = TRUE;                /* check if extracting directory? */
        if (stat(buildpath, &G.statbuf)) {  /* path doesn't exist */
            if (!G.create_dirs) { /* told not to create (freshening) */
                free(buildpath);
                return 2;         /* path doesn't exist:  nothing to do */
            }
            if (too_long) {
                Info(slide, 1, ((char *)slide,
                  "checkdir error:  path too long: %s\n", buildpath));
                free(buildpath);
                return 4;         /* no room for filenames:  fatal */
            }
            if (mkdir(buildpath, 0777) == -1) {   /* create the directory */
                Info(slide, 1, ((char *)slide,
                  "checkdir error:  cannot create %s\n\
                 unable to process %s.\n", buildpath, G.filename));
                free(buildpath);
                return 3;      /* path didn't exist, tried to create, failed */
            }
            created_dir = TRUE;
        } else if (!S_ISDIR(G.statbuf.st_mode)) {
            Info(slide, 1, ((char *)slide,
              "checkdir error:  %s exists but is not directory\n\
                 unable to process %s.\n", buildpath, G.filename));
            free(buildpath);
            return 3;          /* path existed but wasn't dir */
        }
        if (too_long) {
            Info(slide, 1, ((char *)slide,
              "checkdir error:  path too long: %s\n", buildpath));
            free(buildpath);
            return 4;         /* no room for filenames:  fatal */
        }
        *end++ = '/';
        *end = '\0';
        Trace((stderr, "buildpath now = [%s]\n", buildpath));
        return 0;

    } /* end if (FUNCTION == APPEND_DIR) */

/*---------------------------------------------------------------------------
    GETPATH:  copy full path to the string pointed at by pathcomp, and free
    buildpath.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == GETPATH) {
        strcpy(pathcomp, buildpath);
        Trace((stderr, "getting and freeing path [%s]\n", pathcomp));
        free(buildpath);
        buildpath = end = (char *)NULL;
        return 0;
    }

/*---------------------------------------------------------------------------
    APPEND_NAME:  assume the path component is the filename; append it and
    return without checking for existence.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == APPEND_NAME) {
#ifdef SHORT_NAMES
        char *old_end = end;
#endif

        Trace((stderr, "appending filename [%s]\n", pathcomp));
        while ((*end = *pathcomp++) != '\0') {
            ++end;
#ifdef SHORT_NAMES  /* truncate name at 14 characters, typically */
            if ((end-old_end) > FILENAME_MAX)      /* GRR:  proper constant? */
                *(end = old_end + FILENAME_MAX) = '\0';
#endif
            if ((end-buildpath) >= FILNAMSIZ) {
                *--end = '\0';
                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 (pathcomp[rootlen-1] == '/') {
                pathcomp[--rootlen] = '\0';
            }
            if (rootlen > 0 && (stat(pathcomp, &G.statbuf) ||
                !S_ISDIR(G.statbuf.st_mode)))       /* path does not exist */
            {
                if (!G.create_dirs /* || iswild(pathcomp) */ ) {
                    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 ((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() */






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

void close_outfile(__G)    /* GRR: change to return PK-style warning level */
    __GDEF
{
    iztimes zt;
    ush z_uidgid[2];
    unsigned eb_izux_flg;

/*---------------------------------------------------------------------------
    If symbolic links are supported, allocate a storage area, put the uncom-
    pressed "data" in it, and create the link.  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;
        char *linktarget = (char *)malloc((unsigned)G.lrec.ucsize+1);

        fclose(G.outfile);                      /* close "data" file... */
        G.outfile = fopen(G.filename, FOPR);    /* ...and reopen for reading */
        if (!linktarget || fread(linktarget, 1, ucsize, G.outfile) !=
                           (int)ucsize)
        {
            Info(slide, 0x201, ((char *)slide,
              "warning:  symbolic link (%s) failed\n", G.filename));
            if (linktarget)
                free(linktarget);
            fclose(G.outfile);
            return;
        }
        fclose(G.outfile);                  /* close "data" file for good... */
        unlink(G.filename);                 /* ...and delete it */
        linktarget[ucsize] = '\0';
        if (QCOND2)
            Info(slide, 0, ((char *)slide, "-> %s ", linktarget));
        if (symlink(linktarget, G.filename))  /* create the real link */
            perror("symlink error");

        if (!uO.J_flag) {
            /* Symlinks can have attributes, too. */
            void *ptr = scanBeOSexfield( G.extra_field,
                                         G.lrec.extra_field_length );
            if (ptr) {
                setBeOSexfield( G.filename, ptr );
            } else {
                /* Otherwise, ask the system to try assigning a MIME type. */
#ifdef BEOS_ASSIGN_FILETYPE
                assign_MIME( G.filename );
#else
                ; /* optimise me away, baby */
#endif
            }
        }

        free(linktarget);
        return;                             /* can't set time on symlinks */
    }
#endif /* SYMLINKS */

    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.  On the other hand, we
    then have to check for restoration of UID/GID.
  ---------------------------------------------------------------------------*/

    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));
    }

    /* if -X option was specified and we have UID/GID info, restore it */
    if (uO.X_flag && eb_izux_flg & EB_UX2_VALID) {
        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], 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, (struct utimbuf *)&zt)) {
        if (uO.qflag)
            Info(slide, 0x201, ((char *)slide,
              "warning:  cannot set time for %s\n", G.filename));
        else
            Info(slide, 0x201, ((char *)slide,
              " (warning) cannot set time"));
    }

    /* handle the BeOS extra field if present */
    if (!uO.J_flag) {
        void *ptr = scanBeOSexfield( G.extra_field,
                                     G.lrec.extra_field_length );

        if (ptr) {
            setBeOSexfield( G.filename, ptr );
        } else {
#ifdef BEOS_ASSIGN_FILETYPE
            /* Otherwise, ask the system to try assigning a MIME type. */
            assign_MIME( G.filename );
#else
            ; /* optimise me away baby */
#endif
        }