lisp/gnus/mm-archive.el

   1 ;;; mm-archive.el --- Functions for parsing archive files as MIME
   2
   3 ;; Copyright (C) 2012-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software: you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;;; Code:
  24
  25 (require 'mm-decode)
  26 (autoload 'gnus-recursive-directory-files "gnus-util")
  27 (autoload 'mailcap-extension-to-mime "mailcap")
  28
  29 (defvar mm-archive-decoders
  30   '(("application/ms-tnef" t "tnef" "-f" "-" "-C")
  31     ("application/zip" nil "unzip" "-j" "-x" "%f" "-d")
  32     ("application/x-gtar-compressed" nil "tar" "xzf" "-" "-C")
  33     ("application/x-tar" nil "tar" "xf" "-" "-C")))
  34
  35 (defun mm-archive-decoders () mm-archive-decoders)
  36
  37 (defun mm-dissect-archive (handle)
  38   (let ((decoder (cddr (assoc (car (mm-handle-type handle))
  39                               mm-archive-decoders)))
  40         (dir (make-temp-file
  41               (expand-file-name "emm." mm-tmp-directory) 'dir)))
  42     (set-file-modes dir #o700)
  43     (unwind-protect
  44         (progn
  45           (mm-with-unibyte-buffer
  46             (mm-insert-part handle)
  47             (if (member "%f" decoder)
  48                 (let ((file (expand-file-name "mail.zip" dir)))
  49                   (write-region (point-min) (point-max) file nil 'silent)
  50                   (setq decoder (copy-sequence decoder))
  51                   (setcar (member "%f" decoder) file)
  52                   (apply 'call-process (car decoder) nil nil nil
  53                          (append (cdr decoder) (list dir)))
  54                   (delete-file file))
  55               (apply 'call-process-region (point-min) (point-max) (car decoder)
  56                      nil (get-buffer-create "*tnef*")
  57                      nil (append (cdr decoder) (list dir)))))
  58           `("multipart/mixed"
  59             ,handle
  60             ,@(mm-archive-list-files (gnus-recursive-directory-files dir))))
  61       (delete-directory dir t))))
  62
  63 (defun mm-archive-list-files (files)
  64   (let ((handles nil)
  65         type disposition)
  66     (dolist (file files)
  67       (with-temp-buffer
  68         (when (string-match "\\.\\([^.]+\\)$" file)
  69           (setq type (mailcap-extension-to-mime (match-string 1 file))))
  70         (unless type
  71           (setq type "application/octet-stream"))
  72         (setq disposition
  73               (if (string-match "^image/\\|^text/" type)
  74                   "inline"
  75                 "attachment"))
  76         (insert (format "Content-type: %s\n" type))
  77         (insert "Content-Transfer-Encoding: 8bit\n\n")
  78         (insert-file-contents file)
  79         (push
  80          (mm-make-handle (mm-copy-to-buffer)
  81                          (list type)
  82                          '8bit nil
  83                          `(,disposition (filename . ,file))
  84                          nil nil nil)
  85          handles)))
  86     handles))
  87
  88 (defun mm-archive-dissect-and-inline (handle)
  89   (let ((start (point-marker)))
  90     (save-restriction
  91       (narrow-to-region (point) (point))
  92       (dolist (handle (cddr (mm-dissect-archive handle)))
  93         (goto-char (point-max))
  94         (mm-display-inline handle))
  95       (goto-char (point-max))
  96       (mm-handle-set-undisplayer
  97        handle
  98        `(lambda ()
  99           (let ((inhibit-read-only t)
 100                 (end ,(point-marker)))
 101             (remove-images ,start end)
 102             (delete-region ,start end)))))))
 103
 104 (provide 'mm-archive)
 105
 106 ;; mm-archive.el ends here