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[Emacs-diffs] Changes to emacs/lisp/tar-mode.el [emacs-unicode-2]
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From: |
Kenichi Handa |
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Subject: |
[Emacs-diffs] Changes to emacs/lisp/tar-mode.el [emacs-unicode-2] |
|
Date: |
Mon, 08 Sep 2003 08:56:15 -0400 |
Index: emacs/lisp/tar-mode.el
diff -c /dev/null emacs/lisp/tar-mode.el:1.92.4.1
*** /dev/null Mon Sep 8 08:56:15 2003
--- emacs/lisp/tar-mode.el Mon Sep 8 08:53:39 2003
***************
*** 0 ****
--- 1,1242 ----
+ ;;; tar-mode.el --- simple editing of tar files from GNU emacs
+
+ ;; Copyright (C) 1990,91,93,94,95,96,97,98,99,2000,2001
+ ;; Free Software Foundation, Inc.
+
+ ;; Author: Jamie Zawinski <address@hidden>
+ ;; Maintainer: FSF
+ ;; Created: 04 Apr 1990
+ ;; Keywords: unix
+
+ ;; This file is part of GNU Emacs.
+
+ ;; GNU Emacs is free software; you can redistribute it and/or modify
+ ;; it under the terms of the GNU General Public License as published by
+ ;; the Free Software Foundation; either version 2, or (at your option)
+ ;; any later version.
+
+ ;; GNU Emacs is distributed in the hope that it will be useful,
+ ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ ;; GNU General Public License for more details.
+
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with GNU Emacs; see the file COPYING. If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+
+ ;;; Commentary:
+
+ ;; This package attempts to make dealing with Unix 'tar' archives easier.
+ ;; When this code is loaded, visiting a file whose name ends in '.tar' will
+ ;; cause the contents of that archive file to be displayed in a Dired-like
+ ;; listing. It is then possible to use the customary Dired keybindings to
+ ;; extract sub-files from that archive, either by reading them into their own
+ ;; editor buffers, or by copying them directly to arbitrary files on disk.
+ ;; It is also possible to delete sub-files from within the tar file and write
+ ;; the modified archive back to disk, or to edit sub-files within the archive
+ ;; and re-insert the modified files into the archive. See the documentation
+ ;; string of tar-mode for more info.
+
+ ;; This code now understands the extra fields that GNU tar adds to tar files.
+
+ ;; This interacts correctly with "uncompress.el" in the Emacs library,
+ ;; which you get with
+ ;;
+ ;; (autoload 'uncompress-while-visiting "uncompress")
+ ;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting)
+ ;; auto-mode-alist))
+ ;;
+ ;; Do not attempt to use tar-mode.el with crypt.el, you will lose.
+
+ ;; *************** TO DO ***************
+ ;;
+ ;; o chmod should understand "a+x,og-w".
+ ;;
+ ;; o It's not possible to add a NEW file to a tar archive; not that
+ ;; important, but still...
+ ;;
+ ;; o The code is less efficient that it could be - in a lot of places, I
+ ;; pull a 512-character string out of the buffer and parse it, when I could
+ ;; be parsing it in place, not garbaging a string. Should redo that.
+ ;;
+ ;; o I'd like a command that searches for a string/regexp in every subfile
+ ;; of an archive, where <esc> would leave you in a subfile-edit buffer.
+ ;; (Like the Meta-R command of the Zmacs mail reader.)
+ ;;
+ ;; o Sometimes (but not always) reverting the tar-file buffer does not
+ ;; re-grind the listing, and you are staring at the binary tar data.
+ ;; Typing 'g' again immediately after that will always revert and re-grind
+ ;; it, though. I have no idea why this happens.
+ ;;
+ ;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar
+ ;; write-file-hook actually writes the file. Instead it should remove the
+ ;; header (and conspire to put it back afterwards) so that other write-file
+ ;; hooks which frob the buffer have a chance to do their dirty work. There
+ ;; might be a problem if the tar write-file-hook does not come *first* on
+ ;; the list.
+ ;;
+ ;; o Block files, sparse files, continuation files, and the various header
+ ;; types aren't editable. Actually I don't know that they work at all.
+
+ ;; Rationale:
+
+ ;; Why does tar-mode edit the file itself instead of using tar?
+
+ ;; That means that you can edit tar files which you don't have room for
+ ;; on your local disk.
+
+ ;; I don't know about recent features in gnu tar, but old versions of tar
+ ;; can't replace a file in the middle of a tar file with a new version.
+ ;; Tar-mode can. I don't think tar can do things like chmod the subfiles.
+ ;; An implementation which involved unpacking and repacking the file into
+ ;; some scratch directory would be very wasteful, and wouldn't be able to
+ ;; preserve the file owners.
+
+ ;;; Code:
+
+ (defgroup tar nil
+ "Simple editing of tar files."
+ :prefix "tar-"
+ :group 'data)
+
+ (defcustom tar-anal-blocksize 20
+ "*The blocksize of tar files written by Emacs, or nil, meaning don't care.
+ The blocksize of a tar file is not really the size of the blocks; rather, it
is
+ the number of blocks written with one system call. When tarring to a tape,
+ this is the size of the *tape* blocks, but when writing to a file, it doesn't
+ matter much. The only noticeable difference is that if a tar file does not
+ have a blocksize of 20, tar will tell you that; all this really controls is
+ how many null padding bytes go on the end of the tar file."
+ :type '(choice integer (const nil))
+ :group 'tar)
+
+ (defcustom tar-update-datestamp nil
+ "*Non-nil means Tar mode should play fast and loose with sub-file
datestamps.
+ If this is true, then editing and saving a tar file entry back into its
+ tar file will update its datestamp. If false, the datestamp is unchanged.
+ You may or may not want this - it is good in that you can tell when a file
+ in a tar archive has been changed, but it is bad for the same reason that
+ editing a file in the tar archive at all is bad - the changed version of
+ the file never exists on disk."
+ :type 'boolean
+ :group 'tar)
+
+ (defcustom tar-mode-show-date nil
+ "*Non-nil means Tar mode should show the date/time of each subfile.
+ This information is useful, but it takes screen space away from file names."
+ :type 'boolean
+ :group 'tar)
+
+ (defvar tar-parse-info nil)
+ (defvar tar-header-offset nil)
+ (defvar tar-superior-buffer nil)
+ (defvar tar-superior-descriptor nil)
+ (defvar tar-subfile-mode nil)
+ (defvar tar-file-name-coding-system nil)
+
+ (put 'tar-parse-info 'permanent-local t)
+ (put 'tar-header-offset 'permanent-local t)
+ (put 'tar-superior-buffer 'permanent-local t)
+ (put 'tar-superior-descriptor 'permanent-local t)
+ (put 'tar-file-name-coding-system 'permanent-local t)
+
+ (defmacro tar-setf (form val)
+ "A mind-numbingly simple implementation of setf."
+ (let ((mform (macroexpand form (and (boundp 'byte-compile-macro-environment)
+ byte-compile-macro-environment))))
+ (cond ((symbolp mform) (list 'setq mform val))
+ ((not (consp mform)) (error "can't setf %s" form))
+ ((eq (car mform) 'aref)
+ (list 'aset (nth 1 mform) (nth 2 mform) val))
+ ((eq (car mform) 'car)
+ (list 'setcar (nth 1 mform) val))
+ ((eq (car mform) 'cdr)
+ (list 'setcdr (nth 1 mform) val))
+ (t (error "don't know how to setf %s" form)))))
+
+ ;;; down to business.
+
+ (defmacro make-tar-header (name mode uid git size date ck lt ln
+ magic uname gname devmaj devmin)
+ (list 'vector name mode uid git size date ck lt ln
+ magic uname gname devmaj devmin))
+
+ (defmacro tar-header-name (x) (list 'aref x 0))
+ (defmacro tar-header-mode (x) (list 'aref x 1))
+ (defmacro tar-header-uid (x) (list 'aref x 2))
+ (defmacro tar-header-gid (x) (list 'aref x 3))
+ (defmacro tar-header-size (x) (list 'aref x 4))
+ (defmacro tar-header-date (x) (list 'aref x 5))
+ (defmacro tar-header-checksum (x) (list 'aref x 6))
+ (defmacro tar-header-link-type (x) (list 'aref x 7))
+ (defmacro tar-header-link-name (x) (list 'aref x 8))
+ (defmacro tar-header-magic (x) (list 'aref x 9))
+ (defmacro tar-header-uname (x) (list 'aref x 10))
+ (defmacro tar-header-gname (x) (list 'aref x 11))
+ (defmacro tar-header-dmaj (x) (list 'aref x 12))
+ (defmacro tar-header-dmin (x) (list 'aref x 13))
+
+ (defmacro make-tar-desc (data-start tokens)
+ (list 'cons data-start tokens))
+
+ (defmacro tar-desc-data-start (x) (list 'car x))
+ (defmacro tar-desc-tokens (x) (list 'cdr x))
+
+ (defconst tar-name-offset 0)
+ (defconst tar-mode-offset (+ tar-name-offset 100))
+ (defconst tar-uid-offset (+ tar-mode-offset 8))
+ (defconst tar-gid-offset (+ tar-uid-offset 8))
+ (defconst tar-size-offset (+ tar-gid-offset 8))
+ (defconst tar-time-offset (+ tar-size-offset 12))
+ (defconst tar-chk-offset (+ tar-time-offset 12))
+ (defconst tar-linkp-offset (+ tar-chk-offset 8))
+ (defconst tar-link-offset (+ tar-linkp-offset 1))
+ ;;; GNU-tar specific slots.
+ (defconst tar-magic-offset (+ tar-link-offset 100))
+ (defconst tar-uname-offset (+ tar-magic-offset 8))
+ (defconst tar-gname-offset (+ tar-uname-offset 32))
+ (defconst tar-dmaj-offset (+ tar-gname-offset 32))
+ (defconst tar-dmin-offset (+ tar-dmaj-offset 8))
+ (defconst tar-end-offset (+ tar-dmin-offset 8))
+
+ (defun tar-header-block-tokenize (string)
+ "Return a `tar-header' structure.
+ This is a list of name, mode, uid, gid, size,
+ write-date, checksum, link-type, and link-name."
+ (setq string (string-as-unibyte string))
+ (cond ((< (length string) 512) nil)
+ (;(some 'plusp string) ; <-- oops, massive cycle hog!
+ (or (not (= 0 (aref string 0))) ; This will do.
+ (not (= 0 (aref string 101))))
+ (let* ((name-end (1- tar-mode-offset))
+ (link-end (1- tar-magic-offset))
+ (uname-end (1- tar-gname-offset))
+ (gname-end (1- tar-dmaj-offset))
+ (link-p (aref string tar-linkp-offset))
+ (magic-str (substring string tar-magic-offset (1-
tar-uname-offset)))
+ (uname-valid-p (or (string= "ustar " magic-str) (string=
"GNUtar " magic-str)))
+ name linkname
+ (nulsexp "[^\000]*\000"))
+ (when (string-match nulsexp string tar-name-offset)
+ (setq name-end (min name-end (1- (match-end 0)))))
+ (when (string-match nulsexp string tar-link-offset)
+ (setq link-end (min link-end (1- (match-end 0)))))
+ (when (string-match nulsexp string tar-uname-offset)
+ (setq uname-end (min uname-end (1- (match-end 0)))))
+ (when (string-match nulsexp string tar-gname-offset)
+ (setq gname-end (min gname-end (1- (match-end 0)))))
+ (setq name (substring string tar-name-offset name-end)
+ link-p (if (or (= link-p 0) (= link-p ?0))
+ nil
+ (- link-p ?0)))
+ (setq linkname (substring string tar-link-offset link-end))
+ (if default-enable-multibyte-characters
+ (setq name
+ (decode-coding-string name tar-file-name-coding-system)
+ linkname
+ (decode-coding-string linkname
+ tar-file-name-coding-system)))
+ (if (and (null link-p) (string-match "/$" name)) (setq link-p 5)) ;
directory
+ (make-tar-header
+ name
+ (tar-parse-octal-integer string tar-mode-offset tar-uid-offset)
+ (tar-parse-octal-integer string tar-uid-offset tar-gid-offset)
+ (tar-parse-octal-integer string tar-gid-offset tar-size-offset)
+ (tar-parse-octal-integer string tar-size-offset tar-time-offset)
+ (tar-parse-octal-long-integer string tar-time-offset
tar-chk-offset)
+ (tar-parse-octal-integer string tar-chk-offset tar-linkp-offset)
+ link-p
+ linkname
+ uname-valid-p
+ (and uname-valid-p (substring string tar-uname-offset uname-end))
+ (and uname-valid-p (substring string tar-gname-offset gname-end))
+ (tar-parse-octal-integer string tar-dmaj-offset tar-dmin-offset)
+ (tar-parse-octal-integer string tar-dmin-offset tar-end-offset)
+ )))
+ (t 'empty-tar-block)))
+
+
+ (defun tar-parse-octal-integer (string &optional start end)
+ (if (null start) (setq start 0))
+ (if (null end) (setq end (length string)))
+ (if (= (aref string start) 0)
+ 0
+ (let ((n 0))
+ (while (< start end)
+ (setq n (if (< (aref string start) ?0) n
+ (+ (* n 8) (- (aref string start) ?0)))
+ start (1+ start)))
+ n)))
+
+ (defun tar-parse-octal-long-integer (string &optional start end)
+ (if (null start) (setq start 0))
+ (if (null end) (setq end (length string)))
+ (if (= (aref string start) 0)
+ (list 0 0)
+ (let ((lo 0)
+ (hi 0))
+ (while (< start end)
+ (if (>= (aref string start) ?0)
+ (setq lo (+ (* lo 8) (- (aref string start) ?0))
+ hi (+ (* hi 8) (ash lo -16))
+ lo (logand lo 65535)))
+ (setq start (1+ start)))
+ (list hi lo))))
+
+ (defun tar-parse-octal-integer-safe (string)
+ (let ((L (length string)))
+ (if (= L 0) (error "empty string"))
+ (dotimes (i L)
+ (if (or (< (aref string i) ?0)
+ (> (aref string i) ?7))
+ (error "`%c' is not an octal digit"))))
+ (tar-parse-octal-integer string))
+
+
+ (defun tar-header-block-checksum (string)
+ "Compute and return a tar-acceptable checksum for this block."
+ (setq string (string-as-unibyte string))
+ (let* ((chk-field-start tar-chk-offset)
+ (chk-field-end (+ chk-field-start 8))
+ (sum 0)
+ (i 0))
+ ;; Add up all of the characters except the ones in the checksum field.
+ ;; Add that field as if it were filled with spaces.
+ (while (< i chk-field-start)
+ (setq sum (+ sum (aref string i))
+ i (1+ i)))
+ (setq i chk-field-end)
+ (while (< i 512)
+ (setq sum (+ sum (aref string i))
+ i (1+ i)))
+ (+ sum (* 32 8))))
+
+ (defun tar-header-block-check-checksum (hblock desired-checksum file-name)
+ "Beep and print a warning if the checksum doesn't match."
+ (if (not (= desired-checksum (tar-header-block-checksum hblock)))
+ (progn (beep) (message "Invalid checksum for file %s!" file-name))))
+
+ (defun tar-clip-time-string (time)
+ (let ((str (current-time-string time)))
+ (concat " " (substring str 4 16) (substring str 19 24))))
+
+ (defun tar-grind-file-mode (mode)
+ "Construct a `-rw--r--r--' string indicating MODE.
+ MODE should be an integer which is a file mode value."
+ (string
+ (if (zerop (logand 256 mode)) ?- ?r)
+ (if (zerop (logand 128 mode)) ?- ?w)
+ (if (zerop (logand 1024 mode)) (if (zerop (logand 64 mode)) ?- ?x) ?s)
+ (if (zerop (logand 32 mode)) ?- ?r)
+ (if (zerop (logand 16 mode)) ?- ?w)
+ (if (zerop (logand 2048 mode)) (if (zerop (logand 8 mode)) ?- ?x) ?s)
+ (if (zerop (logand 4 mode)) ?- ?r)
+ (if (zerop (logand 2 mode)) ?- ?w)
+ (if (zerop (logand 1 mode)) ?- ?x)))
+
+ (defun tar-header-block-summarize (tar-hblock &optional mod-p)
+ "Return a line similar to the output of `tar -vtf'."
+ (let ((name (tar-header-name tar-hblock))
+ (mode (tar-header-mode tar-hblock))
+ (uid (tar-header-uid tar-hblock))
+ (gid (tar-header-gid tar-hblock))
+ (uname (tar-header-uname tar-hblock))
+ (gname (tar-header-gname tar-hblock))
+ (size (tar-header-size tar-hblock))
+ (time (tar-header-date tar-hblock))
+ (ck (tar-header-checksum tar-hblock))
+ (type (tar-header-link-type tar-hblock))
+ (link-name (tar-header-link-name tar-hblock)))
+ (format "%c%c%s%8s/%-8s%7s%s %s%s"
+ (if mod-p ?* ? )
+ (cond ((or (eq type nil) (eq type 0)) ?-)
+ ((eq type 1) ?h) ; link
+ ((eq type 2) ?l) ; symlink
+ ((eq type 3) ?c) ; char special
+ ((eq type 4) ?b) ; block special
+ ((eq type 5) ?d) ; directory
+ ((eq type 6) ?p) ; FIFO/pipe
+ ((eq type 20) ?*) ; directory listing
+ ((eq type 28) ?L) ; next has longname
+ ((eq type 29) ?M) ; multivolume continuation
+ ((eq type 35) ?S) ; sparse
+ ((eq type 38) ?V) ; volume header
+ (t ?\ )
+ )
+ (tar-grind-file-mode mode)
+ (if (= 0 (length uname)) uid uname)
+ (if (= 0 (length gname)) gid gname)
+ size
+ (if tar-mode-show-date (tar-clip-time-string time) "")
+ (propertize name
+ 'mouse-face 'highlight
+ 'help-echo "mouse-2: extract this file into a buffer")
+ (if (or (eq type 1) (eq type 2))
+ (concat (if (= type 1) " ==> " " --> ") link-name)
+ ""))))
+
+ (defun tar-untar-buffer ()
+ "Extract all archive members in the tar-file into the current directory."
+ (interactive)
+ (let ((multibyte enable-multibyte-characters))
+ (unwind-protect
+ (save-restriction
+ (widen)
+ (set-buffer-multibyte nil)
+ (dolist (descriptor tar-parse-info)
+ (let* ((tokens (tar-desc-tokens descriptor))
+ (name (tar-header-name tokens))
+ (dir (file-name-directory name))
+ (start (+ (tar-desc-data-start descriptor)
+ (- tar-header-offset (point-min))))
+ (end (+ start (tar-header-size tokens))))
+ (unless (file-directory-p name)
+ (message "Extracting %s" name)
+ (if (and dir (not (file-exists-p dir)))
+ (make-directory dir t))
+ (unless (file-directory-p name)
+ (write-region start end name))
+ (set-file-modes name (tar-header-mode tokens))))))
+ (set-buffer-multibyte multibyte))))
+
+ (defun tar-summarize-buffer ()
+ "Parse the contents of the tar file in the current buffer.
+ Place a dired-like listing on the front;
+ then narrow to it, so that only that listing
+ is visible (and the real data of the buffer is hidden)."
+ (message "Parsing tar file...")
+ (let* ((result '())
+ (pos (point-min))
+ (bs (max 1 (- (buffer-size) 1024))) ; always 2+ empty blocks at end.
+ (bs100 (max 1 (/ bs 100)))
+ tokens)
+ (while (and (<= (+ pos 512) (point-max))
+ (not (eq 'empty-tar-block
+ (setq tokens
+ (tar-header-block-tokenize
+ (buffer-substring pos (+ pos 512)))))))
+ (setq pos (+ pos 512))
+ (message "Parsing tar file...%d%%"
+ ;(/ (* pos 100) bs) ; this gets round-off lossage
+ (/ pos bs100) ; this doesn't
+ )
+ (if (eq (tar-header-link-type tokens) 20)
+ ;; Foo. There's an extra empty block after these.
+ (setq pos (+ pos 512)))
+ (let ((size (tar-header-size tokens)))
+ (if (< size 0)
+ (error "%s has size %s - corrupted"
+ (tar-header-name tokens) size))
+ ;
+ ; This is just too slow. Don't really need it anyway....
+ ;(tar-header-block-check-checksum
+ ; hblock (tar-header-block-checksum hblock)
+ ; (tar-header-name tokens))
+
+ (setq result (cons (make-tar-desc pos tokens) result))
+
+ (and (null (tar-header-link-type tokens))
+ (> size 0)
+ (setq pos
+ (+ pos 512 (ash (ash (1- size) -9) 9)) ; this works
+ ;(+ pos (+ size (- 512 (rem (1- size) 512)))) ; this doesn't
+ ))))
+ (make-local-variable 'tar-parse-info)
+ (setq tar-parse-info (nreverse result))
+ ;; A tar file should end with a block or two of nulls,
+ ;; but let's not get a fatal error if it doesn't.
+ (if (eq tokens 'empty-tar-block)
+ (message "Parsing tar file...done")
+ (message "Warning: premature EOF parsing tar file")))
+ (save-excursion
+ (goto-char (point-min))
+ (let ((buffer-read-only nil)
+ (summaries nil))
+ ;; Collect summary lines and insert them all at once since tar files
+ ;; can be pretty big.
+ (dolist (tar-desc (reverse tar-parse-info))
+ (setq summaries
+ (cons (tar-header-block-summarize (tar-desc-tokens tar-desc))
+ (cons "\n"
+ summaries))))
+ (let ((total-summaries (apply 'concat summaries)))
+ (insert total-summaries))
+ (make-local-variable 'tar-header-offset)
+ (setq tar-header-offset (point))
+ (narrow-to-region (point-min) tar-header-offset)
+ (set-buffer-modified-p nil))))
+
+ (defvar tar-mode-map nil "*Local keymap for Tar mode listings.")
+
+ (if tar-mode-map
+ nil
+ (setq tar-mode-map (make-keymap))
+ (suppress-keymap tar-mode-map)
+ (define-key tar-mode-map " " 'tar-next-line)
+ (define-key tar-mode-map "C" 'tar-copy)
+ (define-key tar-mode-map "d" 'tar-flag-deleted)
+ (define-key tar-mode-map "\^D" 'tar-flag-deleted)
+ (define-key tar-mode-map "e" 'tar-extract)
+ (define-key tar-mode-map "f" 'tar-extract)
+ (define-key tar-mode-map "\C-m" 'tar-extract)
+ (define-key tar-mode-map [mouse-2] 'tar-mouse-extract)
+ (define-key tar-mode-map "g" 'revert-buffer)
+ (define-key tar-mode-map "h" 'describe-mode)
+ (define-key tar-mode-map "n" 'tar-next-line)
+ (define-key tar-mode-map "\^N" 'tar-next-line)
+ (define-key tar-mode-map [down] 'tar-next-line)
+ (define-key tar-mode-map "o" 'tar-extract-other-window)
+ (define-key tar-mode-map "p" 'tar-previous-line)
+ (define-key tar-mode-map "q" 'quit-window)
+ (define-key tar-mode-map "\^P" 'tar-previous-line)
+ (define-key tar-mode-map [up] 'tar-previous-line)
+ (define-key tar-mode-map "R" 'tar-rename-entry)
+ (define-key tar-mode-map "u" 'tar-unflag)
+ (define-key tar-mode-map "v" 'tar-view)
+ (define-key tar-mode-map "x" 'tar-expunge)
+ (define-key tar-mode-map "\177" 'tar-unflag-backwards)
+ (define-key tar-mode-map "E" 'tar-extract-other-window)
+ (define-key tar-mode-map "M" 'tar-chmod-entry)
+ (define-key tar-mode-map "G" 'tar-chgrp-entry)
+ (define-key tar-mode-map "O" 'tar-chown-entry)
+ )
+
+ ;; Make menu bar items.
+
+ ;; Get rid of the Edit menu bar item to save space.
+ (define-key tar-mode-map [menu-bar edit] 'undefined)
+
+ (define-key tar-mode-map [menu-bar immediate]
+ (cons "Immediate" (make-sparse-keymap "Immediate")))
+
+ (define-key tar-mode-map [menu-bar immediate view]
+ '("View This File" . tar-view))
+ (define-key tar-mode-map [menu-bar immediate display]
+ '("Display in Other Window" . tar-display-other-window))
+ (define-key tar-mode-map [menu-bar immediate find-file-other-window]
+ '("Find in Other Window" . tar-extract-other-window))
+ (define-key tar-mode-map [menu-bar immediate find-file]
+ '("Find This File" . tar-extract))
+
+ (define-key tar-mode-map [menu-bar mark]
+ (cons "Mark" (make-sparse-keymap "Mark")))
+
+ (define-key tar-mode-map [menu-bar mark unmark-all]
+ '("Unmark All" . tar-clear-modification-flags))
+ (define-key tar-mode-map [menu-bar mark deletion]
+ '("Flag" . tar-flag-deleted))
+ (define-key tar-mode-map [menu-bar mark unmark]
+ '("Unflag" . tar-unflag))
+
+ (define-key tar-mode-map [menu-bar operate]
+ (cons "Operate" (make-sparse-keymap "Operate")))
+
+ (define-key tar-mode-map [menu-bar operate chown]
+ '("Change Owner..." . tar-chown-entry))
+ (define-key tar-mode-map [menu-bar operate chgrp]
+ '("Change Group..." . tar-chgrp-entry))
+ (define-key tar-mode-map [menu-bar operate chmod]
+ '("Change Mode..." . tar-chmod-entry))
+ (define-key tar-mode-map [menu-bar operate rename]
+ '("Rename to..." . tar-rename-entry))
+ (define-key tar-mode-map [menu-bar operate copy]
+ '("Copy to..." . tar-copy))
+ (define-key tar-mode-map [menu-bar operate expunge]
+ '("Expunge Marked Files" . tar-expunge))
+
+ ;; tar mode is suitable only for specially formatted data.
+ (put 'tar-mode 'mode-class 'special)
+ (put 'tar-subfile-mode 'mode-class 'special)
+
+ ;;;###autoload
+ (define-derived-mode tar-mode nil "Tar"
+ "Major mode for viewing a tar file as a dired-like listing of its contents.
+ You can move around using the usual cursor motion commands.
+ Letters no longer insert themselves.
+ Type `e' to pull a file out of the tar file and into its own buffer;
+ or click mouse-2 on the file's line in the Tar mode buffer.
+ Type `c' to copy an entry from the tar file into another file on disk.
+
+ If you edit a sub-file of this archive (as with the `e' command) and
+ save it with Control-x Control-s, the contents of that buffer will be
+ saved back into the tar-file buffer; in this way you can edit a file
+ inside of a tar archive without extracting it and re-archiving it.
+
+ See also: variables `tar-update-datestamp' and `tar-anal-blocksize'.
+ \\{tar-mode-map}"
+ ;; this is not interactive because you shouldn't be turning this
+ ;; mode on and off. You can corrupt things that way.
+ ;; rms: with permanent locals, it should now be possible to make this work
+ ;; interactively in some reasonable fashion.
+ (make-local-variable 'tar-header-offset)
+ (make-local-variable 'tar-parse-info)
+ (set (make-local-variable 'require-final-newline) nil) ; binary data,
dude...
+ (set (make-local-variable 'revert-buffer-function) 'tar-mode-revert)
+ (set (make-local-variable 'local-enable-local-variables) nil)
+ (set (make-local-variable 'next-line-add-newlines) nil)
+ (set (make-local-variable 'tar-file-name-coding-system)
+ (or file-name-coding-system
+ default-file-name-coding-system
+ locale-coding-system))
+ ;; Prevent loss of data when saving the file.
+ (set (make-local-variable 'file-precious-flag) t)
+ (auto-save-mode 0)
+ (set (make-local-variable 'write-contents-hooks) '(tar-mode-write-file))
+ (widen)
+ (if (and (boundp 'tar-header-offset) tar-header-offset)
+ (narrow-to-region (point-min) tar-header-offset)
+ (tar-summarize-buffer)
+ (tar-next-line 0)))
+
+
+ (defun tar-subfile-mode (p)
+ "Minor mode for editing an element of a tar-file.
+ This mode arranges for \"saving\" this buffer to write the data
+ into the tar-file buffer that it came from. The changes will actually
+ appear on disk when you save the tar-file's buffer."
+ (interactive "P")
+ (or (and (boundp 'tar-superior-buffer) tar-superior-buffer)
+ (error "This buffer is not an element of a tar file"))
+ ;; Don't do this, because it is redundant and wastes mode line space.
+ ;; (or (assq 'tar-subfile-mode minor-mode-alist)
+ ;; (setq minor-mode-alist (append minor-mode-alist
+ ;; (list '(tar-subfile-mode " TarFile")))))
+ (make-local-variable 'tar-subfile-mode)
+ (setq tar-subfile-mode
+ (if (null p)
+ (not tar-subfile-mode)
+ (> (prefix-numeric-value p) 0)))
+ (cond (tar-subfile-mode
+ (add-hook 'write-file-functions 'tar-subfile-save-buffer nil t)
+ ;; turn off auto-save.
+ (auto-save-mode -1)
+ (setq buffer-auto-save-file-name nil)
+ (run-hooks 'tar-subfile-mode-hook))
+ (t
+ (remove-hook 'write-file-functions 'tar-subfile-save-buffer t))))
+
+
+ ;; Revert the buffer and recompute the dired-like listing.
+ (defun tar-mode-revert (&optional no-auto-save no-confirm)
+ (let ((revert-buffer-function nil)
+ (old-offset tar-header-offset)
+ success)
+ (setq tar-header-offset nil)
+ (unwind-protect
+ (and (revert-buffer t no-confirm)
+ (progn (widen)
+ (setq success t)
+ (tar-mode)))
+ ;; If the revert was canceled,
+ ;; put back the old value of tar-header-offset.
+ (or success
+ (setq tar-header-offset old-offset)))))
+
+
+ (defun tar-next-line (arg)
+ "Move cursor vertically down ARG lines and to the start of the filename."
+ (interactive "p")
+ (forward-line arg)
+ (if (eobp) nil (forward-char (if tar-mode-show-date 54 36))))
+
+ (defun tar-previous-line (arg)
+ "Move cursor vertically up ARG lines and to the start of the filename."
+ (interactive "p")
+ (tar-next-line (- arg)))
+
+ (defun tar-current-descriptor (&optional noerror)
+ "Return the tar-descriptor of the current line, or signals an error."
+ ;; I wish lines had plists, like in ZMACS...
+ (or (nth (count-lines (point-min)
+ (save-excursion (beginning-of-line) (point)))
+ tar-parse-info)
+ (if noerror
+ nil
+ (error "This line does not describe a tar-file entry"))))
+
+ (defun tar-get-descriptor ()
+ (let* ((descriptor (tar-current-descriptor))
+ (tokens (tar-desc-tokens descriptor))
+ (size (tar-header-size tokens))
+ (link-p (tar-header-link-type tokens)))
+ (if link-p
+ (error "This is a %s, not a real file"
+ (cond ((eq link-p 5) "directory")
+ ((eq link-p 20) "tar directory header")
+ ((eq link-p 28) "next has longname")
+ ((eq link-p 29) "multivolume-continuation")
+ ((eq link-p 35) "sparse entry")
+ ((eq link-p 38) "volume header")
+ (t "link"))))
+ (if (zerop size) (error "This is a zero-length file"))
+ descriptor))
+
+ (defun tar-mouse-extract (event)
+ "Extract a file whose tar directory line you click on."
+ (interactive "e")
+ (save-excursion
+ (set-buffer (window-buffer (posn-window (event-end event))))
+ (save-excursion
+ (goto-char (posn-point (event-end event)))
+ ;; Just make sure this doesn't get an error.
+ (tar-get-descriptor)))
+ (select-window (posn-window (event-end event)))
+ (goto-char (posn-point (event-end event)))
+ (tar-extract))
+
+ (defun tar-extract (&optional other-window-p)
+ "In Tar mode, extract this entry of the tar file into its own buffer."
+ (interactive)
+ (let* ((view-p (eq other-window-p 'view))
+ (descriptor (tar-get-descriptor))
+ (tokens (tar-desc-tokens descriptor))
+ (name (tar-header-name tokens))
+ (size (tar-header-size tokens))
+ (start (+ (tar-desc-data-start descriptor)
+ (- tar-header-offset (point-min))))
+ (end (+ start size)))
+ (let* ((tar-buffer (current-buffer))
+ (tarname (buffer-name))
+ (bufname (concat (file-name-nondirectory name)
+ " ("
+ tarname
+ ")"))
+ (read-only-p (or buffer-read-only view-p))
+ (new-buffer-file-name (expand-file-name
+ ;; `:' is not allowed on Windows
+ (concat tarname "!" name)))
+ (buffer (get-file-buffer new-buffer-file-name))
+ (just-created nil)
+ (pos (point)))
+ (unless buffer
+ (setq buffer (generate-new-buffer bufname))
+ (setq bufname (buffer-name buffer))
+ (setq just-created t)
+ (unwind-protect
+ (let (coding)
+ (narrow-to-region start end)
+ (goto-char start)
+ (setq coding (or coding-system-for-read
+ (and set-auto-coding-function
+ (funcall set-auto-coding-function
+ name (- end start)))))
+ (if (or (not coding)
+ (eq (coding-system-type coding) 'undecided))
+ (setq coding (detect-coding-region start end t)))
+ (if (and default-enable-multibyte-characters
+ (coding-system-get coding :for-unibyte))
+ (save-excursion
+ (set-buffer buffer)
+ (set-buffer-multibyte nil)))
+ (widen)
+ (decode-coding-region start end coding buffer)
+ (save-excursion
+ (set-buffer buffer)
+ (goto-char (point-min))
+ (setq buffer-file-name new-buffer-file-name)
+ (setq buffer-file-truename
+ (abbreviate-file-name buffer-file-name))
+ (set-buffer-file-coding-system coding)
+ ;; Set the default-directory to the dir of the
+ ;; superior buffer.
+ (setq default-directory
+ (save-excursion
+ (set-buffer tar-buffer)
+ default-directory))
+ (normal-mode) ; pick a mode.
+ (rename-buffer bufname)
+ (make-local-variable 'tar-superior-buffer)
+ (make-local-variable 'tar-superior-descriptor)
+ (setq tar-superior-buffer tar-buffer)
+ (setq tar-superior-descriptor descriptor)
+ (setq buffer-read-only read-only-p)
+ (set-buffer-modified-p nil)
+ (tar-subfile-mode 1))
+ (set-buffer tar-buffer))
+ (narrow-to-region (point-min) tar-header-offset)
+ (goto-char pos)))
+ (if view-p
+ (view-buffer buffer (and just-created 'kill-buffer))
+ (if (eq other-window-p 'display)
+ (display-buffer buffer)
+ (if other-window-p
+ (switch-to-buffer-other-window buffer)
+ (switch-to-buffer buffer)))))))
+
+
+ (defun tar-extract-other-window ()
+ "*In Tar mode, find this entry of the tar file in another window."
+ (interactive)
+ (tar-extract t))
+
+ (defun tar-display-other-window ()
+ "*In Tar mode, display this entry of the tar file in another window."
+ (interactive)
+ (tar-extract 'display))
+
+ (defun tar-view ()
+ "*In Tar mode, view the tar file entry on this line."
+ (interactive)
+ (tar-extract 'view))
+
+
+ (defun tar-read-file-name (&optional prompt)
+ "Read a file name with this line's entry as the default."
+ (or prompt (setq prompt "Copy to: "))
+ (let* ((default-file (expand-file-name
+ (tar-header-name (tar-desc-tokens
+ (tar-current-descriptor)))))
+ (target (expand-file-name
+ (read-file-name prompt
+ (file-name-directory default-file)
+ default-file nil))))
+ (if (or (string= "" (file-name-nondirectory target))
+ (file-directory-p target))
+ (setq target (concat (if (string-match "/$" target)
+ (substring target 0 (1- (match-end 0)))
+ target)
+ "/"
+ (file-name-nondirectory default-file))))
+ target))
+
+
+ (defun tar-copy (&optional to-file)
+ "*In Tar mode, extract this entry of the tar file into a file on disk.
+ If TO-FILE is not supplied, it is prompted for, defaulting to the name of
+ the current tar-entry."
+ (interactive (list (tar-read-file-name)))
+ (let* ((descriptor (tar-get-descriptor))
+ (tokens (tar-desc-tokens descriptor))
+ (name (tar-header-name tokens))
+ (size (tar-header-size tokens))
+ (start (+ (tar-desc-data-start descriptor)
+ (- tar-header-offset (point-min))))
+ (end (+ start size))
+ (inhibit-file-name-handlers inhibit-file-name-handlers)
+ (inhibit-file-name-operation inhibit-file-name-operation))
+ (save-restriction
+ (widen)
+ ;; Inhibit compressing a subfile again if *both* name and
+ ;; to-file are handled by jka-compr
+ (if (and (eq (find-file-name-handler name 'write-region)
'jka-compr-handler)
+ (eq (find-file-name-handler to-file 'write-region)
'jka-compr-handler))
+ (setq inhibit-file-name-handlers
+ (cons 'jka-compr-handler
+ (and (eq inhibit-file-name-operation 'write-region)
+ inhibit-file-name-handlers))
+ inhibit-file-name-operation 'write-region))
+ (let ((coding-system-for-write 'no-conversion))
+ (write-region start end to-file nil nil nil t)))
+ (message "Copied tar entry %s to %s" name to-file)))
+
+ (defun tar-flag-deleted (p &optional unflag)
+ "*In Tar mode, mark this sub-file to be deleted from the tar file.
+ With a prefix argument, mark that many files."
+ (interactive "p")
+ (beginning-of-line)
+ (dotimes (i (if (< p 0) (- p) p))
+ (if (tar-current-descriptor unflag) ; barf if we're not on an entry-line.
+ (progn
+ (delete-char 1)
+ (insert (if unflag " " "D"))))
+ (forward-line (if (< p 0) -1 1)))
+ (if (eobp) nil (forward-char 36)))
+
+ (defun tar-unflag (p)
+ "*In Tar mode, un-mark this sub-file if it is marked to be deleted.
+ With a prefix argument, un-mark that many files forward."
+ (interactive "p")
+ (tar-flag-deleted p t))
+
+ (defun tar-unflag-backwards (p)
+ "*In Tar mode, un-mark this sub-file if it is marked to be deleted.
+ With a prefix argument, un-mark that many files backward."
+ (interactive "p")
+ (tar-flag-deleted (- p) t))
+
+
+ (defun tar-expunge-internal ()
+ "Expunge the tar-entry specified by the current line."
+ (let* ((descriptor (tar-current-descriptor))
+ (tokens (tar-desc-tokens descriptor))
+ (line (tar-desc-data-start descriptor))
+ (name (tar-header-name tokens))
+ (size (tar-header-size tokens))
+ (link-p (tar-header-link-type tokens))
+ (start (tar-desc-data-start descriptor))
+ (following-descs (cdr (memq descriptor tar-parse-info))))
+ (if link-p (setq size 0)) ; size lies for hard-links.
+ ;;
+ ;; delete the current line...
+ (beginning-of-line)
+ (let ((line-start (point)))
+ (end-of-line) (forward-char)
+ (let ((line-len (- (point) line-start)))
+ (delete-region line-start (point))
+ ;;
+ ;; decrement the header-pointer to be in sync...
+ (setq tar-header-offset (- tar-header-offset line-len))))
+ ;;
+ ;; delete the data pointer...
+ (setq tar-parse-info (delq descriptor tar-parse-info))
+ ;;
+ ;; delete the data from inside the file...
+ (widen)
+ (let* ((data-start (+ start tar-header-offset -513))
+ (data-end (+ data-start 512 (ash (ash (+ size 511) -9) 9))))
+ (delete-region data-start data-end)
+ ;;
+ ;; and finally, decrement the start-pointers of all following
+ ;; entries in the archive. This is a pig when deleting a bunch
+ ;; of files at once - we could optimize this to only do the
+ ;; iteration over the files that remain, or only iterate up to
+ ;; the next file to be deleted.
+ (let ((data-length (- data-end data-start)))
+ (dolist (desc following-descs)
+ (tar-setf (tar-desc-data-start desc)
+ (- (tar-desc-data-start desc) data-length))))
+ ))
+ (narrow-to-region (point-min) tar-header-offset))
+
+
+ (defun tar-expunge (&optional noconfirm)
+ "*In Tar mode, delete all the archived files flagged for deletion.
+ This does not modify the disk image; you must save the tar file itself
+ for this to be permanent."
+ (interactive)
+ (if (or noconfirm
+ (y-or-n-p "Expunge files marked for deletion? "))
+ (let ((n 0))
+ (save-excursion
+ (goto-char (point-min))
+ (while (not (eobp))
+ (if (looking-at "D")
+ (progn (tar-expunge-internal)
+ (setq n (1+ n)))
+ (forward-line 1)))
+ ;; after doing the deletions, add any padding that may be necessary.
+ (tar-pad-to-blocksize)
+ (narrow-to-region (point-min) tar-header-offset))
+ (if (zerop n)
+ (message "Nothing to expunge.")
+ (message "%s files expunged. Be sure to save this buffer." n)))))
+
+
+ (defun tar-clear-modification-flags ()
+ "Remove the stars at the beginning of each line."
+ (interactive)
+ (save-excursion
+ (goto-char (point-min))
+ (while (< (point) tar-header-offset)
+ (if (not (eq (following-char) ?\ ))
+ (progn (delete-char 1) (insert " ")))
+ (forward-line 1))))
+
+
+ (defun tar-chown-entry (new-uid)
+ "*Change the user-id associated with this entry in the tar file.
+ If this tar file was written by GNU tar, then you will be able to edit
+ the user id as a string; otherwise, you must edit it as a number.
+ You can force editing as a number by calling this with a prefix arg.
+ This does not modify the disk image; you must save the tar file itself
+ for this to be permanent."
+ (interactive (list
+ (let ((tokens (tar-desc-tokens (tar-current-descriptor))))
+ (if (or current-prefix-arg
+ (not (tar-header-magic tokens)))
+ (let (n)
+ (while (not (numberp (setq n (read-minibuffer
+ "New UID number: "
+ (format "%s"
(tar-header-uid tokens)))))))
+ n)
+ (read-string "New UID string: " (tar-header-uname
tokens))))))
+ (cond ((stringp new-uid)
+ (tar-setf (tar-header-uname (tar-desc-tokens (tar-current-descriptor)))
+ new-uid)
+ (tar-alter-one-field tar-uname-offset (concat new-uid "\000")))
+ (t
+ (tar-setf (tar-header-uid (tar-desc-tokens (tar-current-descriptor)))
+ new-uid)
+ (tar-alter-one-field tar-uid-offset
+ (concat (substring (format "%6o" new-uid) 0 6) "\000 ")))))
+
+
+ (defun tar-chgrp-entry (new-gid)
+ "*Change the group-id associated with this entry in the tar file.
+ If this tar file was written by GNU tar, then you will be able to edit
+ the group id as a string; otherwise, you must edit it as a number.
+ You can force editing as a number by calling this with a prefix arg.
+ This does not modify the disk image; you must save the tar file itself
+ for this to be permanent."
+ (interactive (list
+ (let ((tokens (tar-desc-tokens (tar-current-descriptor))))
+ (if (or current-prefix-arg
+ (not (tar-header-magic tokens)))
+ (let (n)
+ (while (not (numberp (setq n (read-minibuffer
+ "New GID number: "
+ (format "%s"
(tar-header-gid tokens)))))))
+ n)
+ (read-string "New GID string: " (tar-header-gname
tokens))))))
+ (cond ((stringp new-gid)
+ (tar-setf (tar-header-gname (tar-desc-tokens (tar-current-descriptor)))
+ new-gid)
+ (tar-alter-one-field tar-gname-offset
+ (concat new-gid "\000")))
+ (t
+ (tar-setf (tar-header-gid (tar-desc-tokens (tar-current-descriptor)))
+ new-gid)
+ (tar-alter-one-field tar-gid-offset
+ (concat (substring (format "%6o" new-gid) 0 6) "\000 ")))))
+
+ (defun tar-rename-entry (new-name)
+ "*Change the name associated with this entry in the tar file.
+ This does not modify the disk image; you must save the tar file itself
+ for this to be permanent."
+ (interactive
+ (list (read-string "New name: "
+ (tar-header-name (tar-desc-tokens (tar-current-descriptor))))))
+ (if (string= "" new-name) (error "zero length name"))
+ (let ((encoded-new-name (encode-coding-string new-name
+ tar-file-name-coding-system)))
+ (if (> (length encoded-new-name) 98) (error "name too long"))
+ (tar-setf (tar-header-name (tar-desc-tokens (tar-current-descriptor)))
+ new-name)
+ (tar-alter-one-field 0
+ (substring (concat encoded-new-name (make-string 99 0)) 0 99))))
+
+
+ (defun tar-chmod-entry (new-mode)
+ "*Change the protection bits associated with this entry in the tar file.
+ This does not modify the disk image; you must save the tar file itself
+ for this to be permanent."
+ (interactive (list (tar-parse-octal-integer-safe
+ (read-string "New protection (octal): "))))
+ (tar-setf (tar-header-mode (tar-desc-tokens (tar-current-descriptor)))
+ new-mode)
+ (tar-alter-one-field tar-mode-offset
+ (concat (substring (format "%6o" new-mode) 0 6) "\000 ")))
+
+
+ (defun tar-alter-one-field (data-position new-data-string)
+ (let* ((descriptor (tar-current-descriptor))
+ (tokens (tar-desc-tokens descriptor)))
+ (unwind-protect
+ (save-excursion
+ ;;
+ ;; update the header-line.
+ (beginning-of-line)
+ (let ((p (point)))
+ (forward-line 1)
+ (delete-region p (point))
+ (insert (tar-header-block-summarize tokens) "\n")
+ (setq tar-header-offset (point-max)))
+
+ (widen)
+ (let* ((start (+ (tar-desc-data-start descriptor) tar-header-offset
-513)))
+ ;;
+ ;; delete the old field and insert a new one.
+ (goto-char (+ start data-position))
+ (delete-region (point) (+ (point) (length new-data-string))) ; <--
+
+ ;; As new-data-string is unibyte, just inserting it will
+ ;; make eight-bit chars to the corresponding multibyte
+ ;; chars. This avoid that conversion, i.e., eight-bit
+ ;; chars are converted to multibyte form of eight-bit
+ ;; chars.
+ (insert (string-to-multibyte new-data-string))
+ ;;
+ ;; compute a new checksum and insert it.
+ (let ((chk (tar-header-block-checksum
+ (buffer-substring start (+ start 512)))))
+ (goto-char (+ start tar-chk-offset))
+ (delete-region (point) (+ (point) 8))
+ (insert (format "%6o" chk))
+ (insert 0)
+ (insert ? )
+ (tar-setf (tar-header-checksum tokens) chk)
+ ;;
+ ;; ok, make sure we didn't botch it.
+ (tar-header-block-check-checksum
+ (buffer-substring start (+ start 512))
+ chk (tar-header-name tokens))
+ )))
+ (narrow-to-region (point-min) tar-header-offset)
+ (tar-next-line 0))))
+
+
+ (defun tar-octal-time (timeval)
+ ;; Format a timestamp as 11 octal digits. Ghod, I hope this works...
+ (let ((hibits (car timeval)) (lobits (car (cdr timeval))))
+ (format "%05o%01o%05o"
+ (lsh hibits -2)
+ (logior (lsh (logand 3 hibits) 1)
+ (if (> (logand lobits 32768) 0) 1 0))
+ (logand 32767 lobits)
+ )))
+
+ (defun tar-subfile-save-buffer ()
+ "In tar subfile mode, save this buffer into its parent tar-file buffer.
+ This doesn't write anything to disk; you must save the parent tar-file buffer
+ to make your changes permanent."
+ (interactive)
+ (if (not (and (boundp 'tar-superior-buffer) tar-superior-buffer))
+ (error "This buffer has no superior tar file buffer"))
+ (if (not (and (boundp 'tar-superior-descriptor) tar-superior-descriptor))
+ (error "This buffer doesn't have an index into its superior tar file!"))
+ (save-excursion
+ (let ((subfile (current-buffer))
+ (coding buffer-file-coding-system)
+ (descriptor tar-superior-descriptor)
+ subfile-size)
+ (set-buffer tar-superior-buffer)
+ (let* ((tokens (tar-desc-tokens descriptor))
+ (start (tar-desc-data-start descriptor))
+ (name (tar-header-name tokens))
+ (size (tar-header-size tokens))
+ (size-pad (ash (ash (+ size 511) -9) 9))
+ (head (memq descriptor tar-parse-info))
+ (following-descs (cdr head)))
+ (if (not head)
+ (error "Can't find this tar file entry in its parent tar file!"))
+ (unwind-protect
+ (save-excursion
+ ;; delete the old data...
+ (let* ((data-start (+ start (- tar-header-offset (point-min))))
+ (data-end (+ data-start (ash (ash (+ size 511) -9) 9))))
+ (narrow-to-region data-start data-end)
+ (delete-region (point-min) (point-max))
+ ;; insert the new data...
+ (goto-char data-start)
+ (save-excursion
+ (set-buffer subfile)
+ (save-restriction
+ (widen)
+ (encode-coding-region 1 (point-max) coding tar-superior-buffer)))
+ (setq subfile-size (- (point-max) (point-min)))
+ ;;
+ ;; pad the new data out to a multiple of 512...
+ (let ((subfile-size-pad (ash (ash (+ subfile-size 511) -9) 9)))
+ (goto-char (point-max))
+ (insert (make-string (- subfile-size-pad subfile-size) 0))
+ ;;
+ ;; update the data pointer of this and all following files...
+ (tar-setf (tar-header-size tokens) subfile-size)
+ (let ((difference (- subfile-size-pad size-pad)))
+ (dolist (desc following-descs)
+ (tar-setf (tar-desc-data-start desc)
+ (+ (tar-desc-data-start desc) difference))))
+ ;;
+ ;; Update the size field in the header block.
+ (widen)
+ (let ((header-start (- data-start 512)))
+ (goto-char (+ header-start tar-size-offset))
+ (delete-region (point) (+ (point) 12))
+ (insert (format "%11o" subfile-size))
+ (insert ? )
+ ;;
+ ;; Maybe update the datestamp.
+ (if (not tar-update-datestamp)
+ nil
+ (goto-char (+ header-start tar-time-offset))
+ (delete-region (point) (+ (point) 12))
+ (insert (tar-octal-time (current-time)))
+ (insert ? ))
+ ;;
+ ;; compute a new checksum and insert it.
+ (let ((chk (tar-header-block-checksum
+ (buffer-substring header-start data-start))))
+ (goto-char (+ header-start tar-chk-offset))
+ (delete-region (point) (+ (point) 8))
+ (insert (format "%6o" chk))
+ (insert 0)
+ (insert ? )
+ (tar-setf (tar-header-checksum tokens) chk)))
+ ;;
+ ;; alter the descriptor-line...
+ ;;
+ (let ((position (- (length tar-parse-info) (length head))))
+ (goto-char (point-min))
+ (next-line position)
+ (beginning-of-line)
+ (let ((p (point))
+ after
+ (m (set-marker (make-marker) tar-header-offset)))
+ (forward-line 1)
+ (setq after (point))
+ ;; Insert the new text after the old, before deleting,
+ ;; to preserve the window start.
+ (let ((line (tar-header-block-summarize tokens t)))
+ (insert-before-markers line "\n"))
+ (delete-region p after)
+ (setq tar-header-offset (marker-position m)))
+ )))
+ ;; after doing the insertion, add any final padding that may be
necessary.
+ (tar-pad-to-blocksize))
+ (narrow-to-region (point-min) tar-header-offset)))
+ (set-buffer-modified-p t) ; mark the tar file as modified
+ (tar-next-line 0)
+ (set-buffer subfile)
+ (set-buffer-modified-p nil) ; mark the tar subfile as unmodified
+ (message "Saved into tar-buffer `%s'. Be sure to save that buffer!"
+ (buffer-name tar-superior-buffer))
+ ;; Prevent basic-save-buffer from changing our coding-system.
+ (setq last-coding-system-used buffer-file-coding-system)
+ ;; Prevent ordinary saving from happening.
+ t)))
+
+
+ ;; When this function is called, it is sure that the buffer is unibyte.
+ (defun tar-pad-to-blocksize ()
+ "If we are being anal about tar file blocksizes, fix up the current buffer.
+ Leaves the region wide."
+ (if (null tar-anal-blocksize)
+ nil
+ (widen)
+ (let* ((last-desc (nth (1- (length tar-parse-info)) tar-parse-info))
+ (start (tar-desc-data-start last-desc))
+ (tokens (tar-desc-tokens last-desc))
+ (link-p (tar-header-link-type tokens))
+ (size (if link-p 0 (tar-header-size tokens)))
+ (data-end (+ start size))
+ (bbytes (ash tar-anal-blocksize 9))
+ (pad-to (+ bbytes (* bbytes (/ (1- data-end) bbytes))))
+ (inhibit-read-only t) ; ##
+ )
+ ;; If the padding after the last data is too long, delete some;
+ ;; else insert some until we are padded out to the right number of
blocks.
+ ;;
+ (goto-char (+ (or tar-header-offset 0) data-end))
+ (if (> (1+ (buffer-size)) (+ (or tar-header-offset 0) pad-to))
+ (delete-region (+ (or tar-header-offset 0) pad-to) (1+ (buffer-size)))
+ (insert (make-string (- (+ (or tar-header-offset 0) pad-to)
+ (1+ (buffer-size)))
+ 0)))
+ )))
+
+
+ ;; Used in write-file-hook to write tar-files out correctly.
+ (defun tar-mode-write-file ()
+ (unwind-protect
+ (save-excursion
+ (widen)
+ ;; Doing this here confuses things - the region gets left too wide!
+ ;; I suppose this is run in a context where changing the buffer is bad.
+ ;; (tar-pad-to-blocksize)
+ ;; tar-header-offset turns out to be null for files fetched with W3,
+ ;; at least.
+ (let ((coding-system-for-write 'no-conversion))
+ (write-region (or tar-header-offset
+ (point-min))
+ (point-max)
+ buffer-file-name nil t))
+ (tar-clear-modification-flags)
+ (set-buffer-modified-p nil))
+ (narrow-to-region (point-min) tar-header-offset))
+ ;; Return t because we've written the file.
+ t)
+
+ (provide 'tar-mode)
+
+ ;;; tar-mode.el ends here
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Kenichi Handa <=