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1137 lines
43 KiB
EmacsLisp
1137 lines
43 KiB
EmacsLisp
;;; tar-mode.el --- simple editing of tar files from GNU emacs
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;;; Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
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;; Author: Jamie Zawinski <jwz@lucid.com>
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;; Created: 04 Apr 1990
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;; Version: 1.21bis (some cleanup by ESR)
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;; Keywords: unix
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;;; This file is part of GNU Emacs.
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;;;
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;;; GNU Emacs is free software; you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 2, or (at your option)
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;;; any later version.
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;;;
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;;; GNU Emacs is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Emacs; see the file COPYING. If not, write to
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;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;;; This package attempts to make dealing with Unix 'tar' archives easier.
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;;; When this code is loaded, visiting a file whose name ends in '.tar' will
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;;; cause the contents of that archive file to be displayed in a Dired-like
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;;; listing. It is then possible to use the customary Dired keybindings to
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;;; extract sub-files from that archive, either by reading them into their own
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;;; editor buffers, or by copying them directly to arbitrary files on disk.
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;;; It is also possible to delete sub-files from within the tar file and write
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;;; the modified archive back to disk, or to edit sub-files within the archive
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;;; and re-insert the modified files into the archive. See the documentation
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;;; string of tar-mode for more info.
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;;; This code now understands the extra fields that GNU tar adds to tar files.
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;;; This interacts correctly with "uncompress.el" in the Emacs library,
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;;; which you get with
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;;;
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;;; (autoload 'uncompress-while-visiting "uncompress")
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;;; (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting)
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;;; auto-mode-alist))
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;;;
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;;; Do not attempt to use tar-mode.el with crypt.el, you will lose.
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;;; *************** TO DO ***************
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;;;
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;;; o chmod should understand "a+x,og-w".
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;;;
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;;; o It's not possible to add a NEW file to a tar archive; not that
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;;; important, but still...
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;;;
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;;; o In the directory listing, we don't show creation times because I don't
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;;; know how to print an arbitrary date, and I don't really want to have to
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;;; implement decode-universal-time.
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;;;
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;;; o The code is less efficient that it could be - in a lot of places, I
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;;; pull a 512-character string out of the buffer and parse it, when I could
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;;; be parsing it in place, not garbaging a string. Should redo that.
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;;;
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;;; o I'd like a command that searches for a string/regexp in every subfile
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;;; of an archive, where <esc> would leave you in a subfile-edit buffer.
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;;; (Like the Meta-R command of the Zmacs mail reader.)
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;;;
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;;; o Sometimes (but not always) reverting the tar-file buffer does not
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;;; re-grind the listing, and you are staring at the binary tar data.
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;;; Typing 'g' again immediately after that will always revert and re-grind
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;;; it, though. I have no idea why this happens.
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;;;
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;;; o Tar-mode interacts poorly with crypt.el and zcat.el because the tar
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;;; write-file-hook actually writes the file. Instead it should remove the
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;;; header (and conspire to put it back afterwards) so that other write-file
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;;; hooks which frob the buffer have a chance to do their dirty work. There
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;;; might be a problem if the tar write-file-hook does not come *first* on
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;;; the list.
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;;;
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;;; o Block files, sparse files, continuation files, and the various header
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;;; types aren't editable. Actually I don't know that they work at all.
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;;; Code:
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(defvar tar-anal-blocksize 20
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"*The blocksize of tar files written by Emacs, or nil, meaning don't care.
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The blocksize of a tar file is not really the size of the blocks; rather, it is
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the number of blocks written with one system call. When tarring to a tape,
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this is the size of the *tape* blocks, but when writing to a file, it doesn't
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matter much. The only noticeable difference is that if a tar file does not
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have a blocksize of 20, tar will tell you that; all this really controls is
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how many null padding bytes go on the end of the tar file.")
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(defvar tar-update-datestamp nil
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"*Whether tar-mode should play fast and loose with sub-file datestamps;
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if this is true, then editing and saving a tar file entry back into its
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tar file will update its datestamp. If false, the datestamp is unchanged.
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You may or may not want this - it is good in that you can tell when a file
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in a tar archive has been changed, but it is bad for the same reason that
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editing a file in the tar archive at all is bad - the changed version of
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the file never exists on disk.")
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(defvar tar-parse-info nil)
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(defvar tar-header-offset nil)
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(defvar tar-superior-buffer nil)
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(defvar tar-superior-descriptor nil)
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(defvar tar-subfile-mode nil)
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(put 'tar-parse-info 'permanent-local t)
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(put 'tar-header-offset 'permanent-local t)
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(put 'tar-superior-buffer 'permanent-local t)
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(put 'tar-superior-descriptor 'permanent-local t)
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;;; First, duplicate some Common Lisp functions; I used to just (require 'cl)
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;;; but "cl.el" was messing some people up (also it's really big).
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(defmacro tar-setf (form val)
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"A mind-numbingly simple implementation of setf."
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(let ((mform (macroexpand form (and (boundp 'byte-compile-macro-environment)
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byte-compile-macro-environment))))
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(cond ((symbolp mform) (list 'setq mform val))
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((not (consp mform)) (error "can't setf %s" form))
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((eq (car mform) 'aref)
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(list 'aset (nth 1 mform) (nth 2 mform) val))
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((eq (car mform) 'car)
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(list 'setcar (nth 1 mform) val))
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((eq (car mform) 'cdr)
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(list 'setcdr (nth 1 mform) val))
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(t (error "don't know how to setf %s" form)))))
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(defmacro tar-dolist (control &rest body)
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"syntax: (dolist (var-name list-expr &optional return-value) &body body)"
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(let ((var (car control))
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(init (car (cdr control)))
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(val (car (cdr (cdr control)))))
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(list 'let (list (list '_dolist_iterator_ init))
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(list 'while '_dolist_iterator_
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(cons 'let
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(cons (list (list var '(car _dolist_iterator_)))
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(append body
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(list (list 'setq '_dolist_iterator_
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(list 'cdr '_dolist_iterator_)))))))
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val)))
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(defmacro tar-dotimes (control &rest body)
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"syntax: (dolist (var-name count-expr &optional return-value) &body body)"
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(let ((var (car control))
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(n (car (cdr control)))
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(val (car (cdr (cdr control)))))
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(list 'let (list (list '_dotimes_end_ n)
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(list var 0))
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(cons 'while
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(cons (list '< var '_dotimes_end_)
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(append body
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(list (list 'setq var (list '1+ var))))))
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val)))
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;;; down to business.
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(defmacro make-tar-header (name mode uid git size date ck lt ln
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magic uname gname devmaj devmin)
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(list 'vector name mode uid git size date ck lt ln
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magic uname gname devmaj devmin))
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(defmacro tar-header-name (x) (list 'aref x 0))
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(defmacro tar-header-mode (x) (list 'aref x 1))
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(defmacro tar-header-uid (x) (list 'aref x 2))
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(defmacro tar-header-gid (x) (list 'aref x 3))
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(defmacro tar-header-size (x) (list 'aref x 4))
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(defmacro tar-header-date (x) (list 'aref x 5))
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(defmacro tar-header-checksum (x) (list 'aref x 6))
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(defmacro tar-header-link-type (x) (list 'aref x 7))
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(defmacro tar-header-link-name (x) (list 'aref x 8))
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(defmacro tar-header-magic (x) (list 'aref x 9))
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(defmacro tar-header-uname (x) (list 'aref x 10))
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(defmacro tar-header-gname (x) (list 'aref x 11))
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(defmacro tar-header-dmaj (x) (list 'aref x 12))
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(defmacro tar-header-dmin (x) (list 'aref x 13))
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(defmacro make-tar-desc (data-start tokens)
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(list 'cons data-start tokens))
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(defmacro tar-desc-data-start (x) (list 'car x))
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(defmacro tar-desc-tokens (x) (list 'cdr x))
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(defconst tar-name-offset 0)
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(defconst tar-mode-offset (+ tar-name-offset 100))
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(defconst tar-uid-offset (+ tar-mode-offset 8))
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(defconst tar-gid-offset (+ tar-uid-offset 8))
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(defconst tar-size-offset (+ tar-gid-offset 8))
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(defconst tar-time-offset (+ tar-size-offset 12))
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(defconst tar-chk-offset (+ tar-time-offset 12))
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(defconst tar-linkp-offset (+ tar-chk-offset 8))
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(defconst tar-link-offset (+ tar-linkp-offset 1))
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;;; GNU-tar specific slots.
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(defconst tar-magic-offset (+ tar-link-offset 100))
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(defconst tar-uname-offset (+ tar-magic-offset 8))
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(defconst tar-gname-offset (+ tar-uname-offset 32))
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(defconst tar-dmaj-offset (+ tar-gname-offset 32))
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(defconst tar-dmin-offset (+ tar-dmaj-offset 8))
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(defconst tar-end-offset (+ tar-dmin-offset 8))
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(defun tokenize-tar-header-block (string)
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"Return a `tar-header' structure.
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This is a list of name, mode, uid, gid, size,
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write-date, checksum, link-type, and link-name."
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(cond ((< (length string) 512) nil)
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(;(some 'plusp string) ; <-- oops, massive cycle hog!
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(or (not (= 0 (aref string 0))) ; This will do.
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(not (= 0 (aref string 101))))
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(let* ((name-end (1- tar-mode-offset))
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(link-end (1- tar-magic-offset))
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(uname-end (1- tar-gname-offset))
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(gname-end (1- tar-dmaj-offset))
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(link-p (aref string tar-linkp-offset))
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(magic-str (substring string tar-magic-offset (1- tar-uname-offset)))
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(uname-valid-p (or (string= "ustar " magic-str) (string= "GNUtar " magic-str)))
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name
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(nulsexp "[^\000]*\000"))
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(and (string-match nulsexp string tar-name-offset) (setq name-end (min name-end (1- (match-end 0)))))
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(and (string-match nulsexp string tar-link-offset) (setq link-end (min link-end (1- (match-end 0)))))
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(and (string-match nulsexp string tar-uname-offset) (setq uname-end (min uname-end (1- (match-end 0)))))
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(and (string-match nulsexp string tar-gname-offset) (setq gname-end (min gname-end (1- (match-end 0)))))
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(setq name (substring string tar-name-offset name-end)
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link-p (if (or (= link-p 0) (= link-p ?0))
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nil
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(- link-p ?0)))
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(if (and (null link-p) (string-match "/$" name)) (setq link-p 5)) ; directory
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(make-tar-header
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name
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(tar-parse-octal-integer string tar-mode-offset (1- tar-uid-offset))
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(tar-parse-octal-integer string tar-uid-offset (1- tar-gid-offset))
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(tar-parse-octal-integer string tar-gid-offset (1- tar-size-offset))
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(tar-parse-octal-integer string tar-size-offset (1- tar-time-offset))
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(tar-parse-octal-integer string tar-time-offset (1- tar-chk-offset))
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(tar-parse-octal-integer string tar-chk-offset (1- tar-linkp-offset))
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link-p
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(substring string tar-link-offset link-end)
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uname-valid-p
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(and uname-valid-p (substring string tar-uname-offset uname-end))
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(and uname-valid-p (substring string tar-gname-offset gname-end))
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(tar-parse-octal-integer string tar-dmaj-offset (1- tar-dmin-offset))
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(tar-parse-octal-integer string tar-dmin-offset (1- tar-end-offset))
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)))
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(t 'empty-tar-block)))
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(defun tar-parse-octal-integer (string &optional start end)
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(if (null start) (setq start 0))
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(if (null end) (setq end (length string)))
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(if (= (aref string start) 0)
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0
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(let ((n 0))
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(while (< start end)
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(setq n (if (< (aref string start) ?0) n
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(+ (* n 8) (- (aref string start) 48)))
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start (1+ start)))
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n)))
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(defun tar-parse-octal-integer-safe (string)
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(let ((L (length string)))
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(if (= L 0) (error "empty string"))
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(tar-dotimes (i L)
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(if (or (< (aref string i) ?0)
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(> (aref string i) ?7))
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(error "'%c' is not an octal digit."))))
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(tar-parse-octal-integer string))
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(defun checksum-tar-header-block (string)
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"Compute and return a tar-acceptable checksum for this block."
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(let* ((chk-field-start tar-chk-offset)
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(chk-field-end (+ chk-field-start 8))
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(sum 0)
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(i 0))
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;; Add up all of the characters except the ones in the checksum field.
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;; Add that field as if it were filled with spaces.
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(while (< i chk-field-start)
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(setq sum (+ sum (aref string i))
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i (1+ i)))
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(setq i chk-field-end)
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(while (< i 512)
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(setq sum (+ sum (aref string i))
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i (1+ i)))
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(+ sum (* 32 8))))
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(defun check-tar-header-block-checksum (hblock desired-checksum file-name)
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"Beep and print a warning if the checksum doesn't match."
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(if (not (= desired-checksum (checksum-tar-header-block hblock)))
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(progn (beep) (message "Invalid checksum for file %s!" file-name))))
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(defun recompute-tar-header-block-checksum (hblock)
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"Modifies the given string to have a valid checksum field."
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(let* ((chk (checksum-tar-header-block hblock))
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(chk-string (format "%6o" chk))
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(l (length chk-string)))
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(aset hblock 154 0)
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(aset hblock 155 32)
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(tar-dotimes (i l) (aset hblock (- 153 i) (aref chk-string (- l i 1)))))
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hblock)
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(defun tar-grind-file-mode (mode string start)
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"Write a \"-rw--r--r-\" representing MODE into STRING beginning at START."
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(aset string start (if (zerop (logand 256 mode)) ?- ?r))
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(aset string (+ start 1) (if (zerop (logand 128 mode)) ?- ?w))
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(aset string (+ start 2) (if (zerop (logand 64 mode)) ?- ?x))
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(aset string (+ start 3) (if (zerop (logand 32 mode)) ?- ?r))
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(aset string (+ start 4) (if (zerop (logand 16 mode)) ?- ?w))
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(aset string (+ start 5) (if (zerop (logand 8 mode)) ?- ?x))
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(aset string (+ start 6) (if (zerop (logand 4 mode)) ?- ?r))
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(aset string (+ start 7) (if (zerop (logand 2 mode)) ?- ?w))
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(aset string (+ start 8) (if (zerop (logand 1 mode)) ?- ?x))
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(if (zerop (logand 1024 mode)) nil (aset string (+ start 2) ?s))
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(if (zerop (logand 2048 mode)) nil (aset string (+ start 5) ?s))
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string)
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(defun summarize-tar-header-block (tar-hblock &optional mod-p)
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"Returns a line similar to the output of `tar -vtf'."
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(let ((name (tar-header-name tar-hblock))
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(mode (tar-header-mode tar-hblock))
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(uid (tar-header-uid tar-hblock))
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(gid (tar-header-gid tar-hblock))
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(uname (tar-header-uname tar-hblock))
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(gname (tar-header-gname tar-hblock))
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(size (tar-header-size tar-hblock))
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(time (tar-header-date tar-hblock))
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(ck (tar-header-checksum tar-hblock))
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(link-p (tar-header-link-type tar-hblock))
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(link-name (tar-header-link-name tar-hblock))
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)
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(let* ((left 11)
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(namew 8)
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(groupw 8)
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(sizew 8)
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(datew 2)
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(slash (1- (+ left namew)))
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(lastdigit (+ slash groupw sizew))
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(namestart (+ lastdigit datew))
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(string (make-string (+ namestart (length name) (if link-p (+ 5 (length link-name)) 0)) 32))
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(type (tar-header-link-type tar-hblock)))
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(aset string 0 (if mod-p ?* ? ))
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(aset string 1
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(cond ((or (eq type nil) (eq type 0)) ?-)
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((eq type 1) ?l) ; link
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((eq type 2) ?s) ; symlink
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((eq type 3) ?c) ; char special
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((eq type 4) ?b) ; block special
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((eq type 5) ?d) ; directory
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((eq type 6) ?p) ; FIFO/pipe
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((eq type 20) ?*) ; directory listing
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((eq type 29) ?M) ; multivolume continuation
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((eq type 35) ?S) ; sparse
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((eq type 38) ?V) ; volume header
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))
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(tar-grind-file-mode mode string 2)
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(setq uid (if (= 0 (length uname)) (int-to-string uid) uname))
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(setq gid (if (= 0 (length gname)) (int-to-string gid) gname))
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(setq size (int-to-string size))
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(tar-dotimes (i (min (1- namew) (length uid))) (aset string (- slash i) (aref uid (- (length uid) i 1))))
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(aset string (1+ slash) ?/)
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(tar-dotimes (i (min (1- groupw) (length gid))) (aset string (+ (+ slash 2) i) (aref gid i)))
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(tar-dotimes (i (min sizew (length size))) (aset string (- lastdigit i) (aref size (- (length size) i 1))))
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;; ## bloody hell, how do I print an arbitrary date??
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(tar-dotimes (i (length name)) (aset string (+ namestart i) (aref name i)))
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(if (or (eq link-p 1) (eq link-p 2))
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(progn
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(tar-dotimes (i 3) (aset string (+ namestart 1 (length name) i) (aref (if (= link-p 1) "==>" "-->") i)))
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(tar-dotimes (i (length link-name)) (aset string (+ namestart 5 (length name) i) (aref link-name i)))))
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string)))
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(defun tar-summarize-buffer ()
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"Parse the contents of the tar file in the current buffer.
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Place a dired-like listing on the front;
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then narrow to it, so that only that listing
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is visible (and the real data of the buffer is hidden)."
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(message "parsing tar file...")
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(let* ((result '())
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(pos 1)
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(bs (max 1 (- (buffer-size) 1024))) ; always 2+ empty blocks at end.
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(bs100 (max 1 (/ bs 100)))
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(tokens nil))
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(while (not (eq tokens 'empty-tar-block))
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(let* ((hblock (buffer-substring pos (+ pos 512))))
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(setq tokens (tokenize-tar-header-block hblock))
|
||
(setq pos (+ pos 512))
|
||
(message "parsing tar file...%s%%"
|
||
;(/ (* pos 100) bs) ; this gets round-off lossage
|
||
(/ pos bs100) ; this doesn't
|
||
)
|
||
(if (eq tokens 'empty-tar-block)
|
||
nil
|
||
(if (null tokens) (error "premature EOF parsing tar file."))
|
||
(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....
|
||
;(check-tar-header-block-checksum
|
||
; hblock (checksum-tar-header-block hblock)
|
||
; (tar-header-name tokens))
|
||
|
||
(setq result (cons (make-tar-desc pos tokens) result))
|
||
|
||
(if (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)))
|
||
(save-excursion
|
||
(goto-char (point-min))
|
||
(let ((buffer-read-only nil))
|
||
(tar-dolist (tar-desc tar-parse-info)
|
||
(insert-string
|
||
(summarize-tar-header-block (tar-desc-tokens tar-desc)))
|
||
(insert-string "\n"))
|
||
(make-local-variable 'tar-header-offset)
|
||
(setq tar-header-offset (point))
|
||
(narrow-to-region 1 tar-header-offset)
|
||
(set-buffer-modified-p nil)))
|
||
(message "parsing tar file...done."))
|
||
|
||
(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 "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 "o" 'tar-extract-other-window)
|
||
(define-key tar-mode-map "p" 'tar-previous-line)
|
||
(define-key tar-mode-map "\^P" '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-file))
|
||
(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
|
||
(defun tar-mode ()
|
||
"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.
|
||
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.
|
||
(kill-all-local-variables)
|
||
(make-local-variable 'tar-header-offset)
|
||
(make-local-variable 'tar-parse-info)
|
||
(make-local-variable 'require-final-newline)
|
||
(setq require-final-newline nil) ; binary data, dude...
|
||
(make-local-variable 'revert-buffer-function)
|
||
(setq revert-buffer-function 'tar-mode-revert)
|
||
(make-local-variable 'enable-local-variables)
|
||
(setq enable-local-variables nil)
|
||
(setq major-mode 'tar-mode)
|
||
(setq mode-name "Tar")
|
||
(use-local-map tar-mode-map)
|
||
(auto-save-mode 0)
|
||
(widen)
|
||
(if (and (boundp 'tar-header-offset) tar-header-offset)
|
||
(narrow-to-region 1 tar-header-offset)
|
||
(tar-summarize-buffer))
|
||
(run-hooks 'tar-mode-hook)
|
||
)
|
||
|
||
|
||
;; This should be converted to use a minor mode keymap.
|
||
|
||
(defun tar-subfile-mode (p)
|
||
"Minor mode for editing an element of a tar-file.
|
||
This mode redefines C-x C-s to save the current buffer back into its
|
||
associated tar-file buffer. You must save that buffer to actually
|
||
save your changes to disk."
|
||
(interactive "P")
|
||
(or (and (boundp 'tar-superior-buffer) tar-superior-buffer)
|
||
(error "This buffer is not an element of a tar file"))
|
||
(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
|
||
(make-local-variable 'local-write-file-hooks)
|
||
(setq local-write-file-hooks '(tar-subfile-save-buffer))
|
||
;; turn off auto-save.
|
||
(auto-save-mode nil)
|
||
(setq buffer-auto-save-file-name nil)
|
||
(run-hooks 'tar-subfile-mode-hook))
|
||
(t
|
||
(kill-local-variable 'local-write-file-hooks))))
|
||
|
||
|
||
;; Revert the buffer and recompute the dired-like listing.
|
||
(defun tar-mode-revert (&optional no-autosave no-confirm)
|
||
(setq tar-header-offset nil)
|
||
(let ((revert-buffer-function nil))
|
||
(revert-buffer t no-confirm)
|
||
(widen))
|
||
(tar-mode))
|
||
|
||
|
||
(defun tar-next-line (p)
|
||
(interactive "p")
|
||
(forward-line p)
|
||
(if (eobp) nil (forward-char 36)))
|
||
|
||
(defun tar-previous-line (p)
|
||
(interactive "p")
|
||
(tar-next-line (- p)))
|
||
|
||
(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-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-current-descriptor))
|
||
(tokens (tar-desc-tokens descriptor))
|
||
(name (tar-header-name tokens))
|
||
(size (tar-header-size tokens))
|
||
(link-p (tar-header-link-type tokens))
|
||
(start (+ (tar-desc-data-start descriptor) tar-header-offset -1))
|
||
(end (+ start size)))
|
||
(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 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."))
|
||
(let* ((tar-buffer (current-buffer))
|
||
(bufname (concat (file-name-nondirectory name)
|
||
" (" name " in "
|
||
(file-name-nondirectory (buffer-file-name))
|
||
")"))
|
||
(read-only-p (or buffer-read-only view-p))
|
||
(buffer (get-buffer bufname))
|
||
(just-created nil))
|
||
(if buffer
|
||
nil
|
||
(setq buffer (get-buffer-create bufname))
|
||
(setq just-created t)
|
||
(unwind-protect
|
||
(progn
|
||
(widen)
|
||
(save-excursion
|
||
(set-buffer buffer)
|
||
(insert-buffer-substring tar-buffer start end)
|
||
(goto-char 0)
|
||
(set-visited-file-name name) ; give it a name to decide mode.
|
||
(normal-mode) ; pick a mode.
|
||
(set-visited-file-name nil) ; nuke the name - not meaningful.
|
||
(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)
|
||
(tar-subfile-mode 1)
|
||
|
||
(setq buffer-read-only read-only-p)
|
||
(set-buffer-modified-p nil))
|
||
(set-buffer tar-buffer))
|
||
(narrow-to-region 1 tar-header-offset)))
|
||
(if view-p
|
||
(progn
|
||
(view-buffer buffer)
|
||
(and just-created
|
||
(setq view-exit-action '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-current-descriptor))
|
||
(tokens (tar-desc-tokens descriptor))
|
||
(name (tar-header-name tokens))
|
||
(size (tar-header-size tokens))
|
||
(link-p (tar-header-link-type tokens))
|
||
(start (+ (tar-desc-data-start descriptor) tar-header-offset -1))
|
||
(end (+ start size)))
|
||
(if link-p (error "This is a link, not a real file."))
|
||
(if (zerop size) (error "This is a zero-length file."))
|
||
(let* ((tar-buffer (current-buffer))
|
||
buffer)
|
||
(unwind-protect
|
||
(progn
|
||
(setq buffer (generate-new-buffer "*tar-copy-tmp*"))
|
||
(widen)
|
||
(save-excursion
|
||
(set-buffer buffer)
|
||
(insert-buffer-substring tar-buffer start end)
|
||
(set-buffer-modified-p nil) ; in case we abort
|
||
(write-file to-file)
|
||
(message "Copied tar entry %s to %s" name to-file)
|
||
(set-buffer tar-buffer)))
|
||
(narrow-to-region 1 tar-header-offset)
|
||
(if buffer (kill-buffer buffer)))
|
||
)))
|
||
|
||
|
||
(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)
|
||
(tar-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 synch...
|
||
(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)))
|
||
(tar-dolist (desc following-descs)
|
||
(tar-setf (tar-desc-data-start desc)
|
||
(- (tar-desc-data-start desc) data-length))))
|
||
))
|
||
(narrow-to-region 1 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 0)
|
||
(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 1 tar-header-offset)
|
||
)
|
||
(if (zerop n)
|
||
(message "nothing to expunge.")
|
||
(message "%s expunged. Be sure to save this buffer." n)))))
|
||
|
||
|
||
(defun tar-clear-modification-flags ()
|
||
"Remove the stars at the beginning of each line."
|
||
(save-excursion
|
||
(goto-char 0)
|
||
(while (< (point) tar-header-offset)
|
||
(if (looking-at "*")
|
||
(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."))
|
||
(if (> (length 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 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 (summarize-tar-header-block 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))) ; <--
|
||
(insert new-data-string) ; <--
|
||
;;
|
||
;; compute a new checksum and insert it.
|
||
(let ((chk (checksum-tar-header-block
|
||
(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.
|
||
(check-tar-header-block-checksum
|
||
(buffer-substring start (+ start 512))
|
||
chk (tar-header-name tokens))
|
||
)))
|
||
(narrow-to-region 1 tar-header-offset))))
|
||
|
||
|
||
(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))))
|
||
(insert (format "%05o%01o%05o"
|
||
(lsh hibits -2)
|
||
(logior (lsh (logand 3 hibits) 1) (> (logand lobits 32768) 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))
|
||
(subfile-size (buffer-size))
|
||
(descriptor tar-superior-descriptor))
|
||
(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
|
||
(widen)
|
||
;; delete the old data...
|
||
(let* ((data-start (+ start tar-header-offset -1))
|
||
(data-end (+ data-start (ash (ash (+ size 511) -9) 9))))
|
||
(delete-region data-start data-end)
|
||
;; insert the new data...
|
||
(goto-char data-start)
|
||
(insert-buffer subfile)
|
||
;;
|
||
;; pad the new data out to a multiple of 512...
|
||
(let ((subfile-size-pad (ash (ash (+ subfile-size 511) -9) 9)))
|
||
(goto-char (+ data-start subfile-size))
|
||
(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)))
|
||
(tar-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.
|
||
(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 (checksum-tar-header-block
|
||
(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 1)
|
||
(next-line position)
|
||
(beginning-of-line)
|
||
(let ((p (point))
|
||
(m (set-marker (make-marker) tar-header-offset)))
|
||
(forward-line 1)
|
||
(delete-region p (point))
|
||
(insert-before-markers (summarize-tar-header-block tokens t) "\n")
|
||
(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 1 tar-header-offset)))
|
||
(set-buffer-modified-p t) ; mark the tar file as modified
|
||
(set-buffer subfile)
|
||
(set-buffer-modified-p nil) ; mark the tar subfile as unmodified
|
||
(message "saved into tar-buffer \"%s\" - remember to save that buffer!"
|
||
(buffer-name tar-superior-buffer))
|
||
;; Prevent ordinary saving from happening.
|
||
t)))
|
||
|
||
|
||
(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)))
|
||
)))
|
||
|
||
|
||
(defun maybe-write-tar-file ()
|
||
"Used as a write-file-hook to write tar-files out correctly."
|
||
;;
|
||
;; If the current buffer is in Tar mode and has its header-offset set,
|
||
;; only write out the part of the file after the header-offset.
|
||
;;
|
||
(if (and (eq major-mode 'tar-mode)
|
||
(and (boundp 'tar-header-offset) tar-header-offset))
|
||
(unwind-protect
|
||
(save-excursion
|
||
(tar-clear-modification-flags)
|
||
(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)
|
||
(write-region tar-header-offset (1+ (buffer-size)) buffer-file-name nil t)
|
||
;; return T because we've written the file.
|
||
t)
|
||
(narrow-to-region 1 tar-header-offset)
|
||
t)
|
||
;; return NIL because we haven't.
|
||
nil))
|
||
|
||
|
||
;;; Patch it in.
|
||
|
||
(or (memq 'maybe-write-tar-file write-file-hooks)
|
||
(setq write-file-hooks
|
||
(cons 'maybe-write-tar-file write-file-hooks)))
|
||
|
||
(provide 'tar-mode)
|
||
|
||
;;; tar-mode.el ends here
|