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;;; mm-archive.el --- Functions for parsing archive files as MIME -*- lexical-binding: t; -*-
;; Copyright (C) 2012-2021 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'mm-decode)
(autoload 'gnus-recursive-directory-files "gnus-util")
(autoload 'gnus-get-buffer-create "gnus")
(autoload 'mailcap-extension-to-mime "mailcap")
(defvar mm-archive-decoders
'(("application/ms-tnef" t "tnef" "-f" "-" "-C")
("application/zip" nil "unzip" "-j" "-x" "%f" "-d")
("application/x-gtar-compressed" nil "tar" "xzf" "-" "-C")
("application/x-tar-gz" nil "tar" "xzf" "-" "-C")
("application/x-tar" nil "tar" "xf" "-" "-C")))
(defun mm-archive-decoders () mm-archive-decoders)
(defun mm-dissect-archive (handle)
(let* ((type (car (mm-handle-type handle)))
(decoder (cddr (assoc type mm-archive-decoders)))
dir)
(unless decoder
(error "No decoder found for %s" type))
(with-file-modes #o700
(setq dir (make-temp-file (expand-file-name "emm." mm-tmp-directory)
'dir)))
(unwind-protect
(progn
(mm-with-unibyte-buffer
(mm-insert-part handle)
(if (member "%f" decoder)
(let ((file (expand-file-name "mail.zip" dir)))
(write-region (point-min) (point-max) file nil 'silent)
(setq decoder (copy-sequence decoder))
(setcar (member "%f" decoder) file)
(apply #'call-process (car decoder) nil nil nil
(append (cdr decoder) (list dir)))
(delete-file file))
(apply #'call-process-region (point-min) (point-max) (car decoder)
nil (gnus-get-buffer-create "*tnef*")
nil (append (cdr decoder) (list dir)))))
`("multipart/mixed"
,handle
,@(mm-archive-list-files (gnus-recursive-directory-files dir))))
(delete-directory dir t))))
(defun mm-archive-list-files (files)
(let ((handles nil)
type disposition)
(dolist (file files)
(with-temp-buffer
(when (string-match "\\.\\([^.]+\\)$" file)
(setq type (mailcap-extension-to-mime (match-string 1 file))))
(unless type
(setq type "application/octet-stream"))
(setq disposition
(if (string-match "^image/\\|^text/" type)
"inline"
"attachment"))
(insert (format "Content-type: %s\n" type))
(insert "Content-Transfer-Encoding: 8bit\n\n")
(insert-file-contents file)
(push
(mm-make-handle (mm-copy-to-buffer)
(list type)
'8bit nil
`(,disposition (filename . ,file))
nil nil nil)
handles)))
handles))
(defun mm-archive-dissect-and-inline (handle)
(let ((start (point-marker)))
(save-restriction
(narrow-to-region (point) (point))
(dolist (handle (cddr (mm-dissect-archive handle)))
(goto-char (point-max))
(mm-display-inline handle))
(goto-char (point-max))
(mm-handle-set-undisplayer
handle
(let ((end (point-marker)))
(lambda ()
(let ((inhibit-read-only t))
(remove-images start end)
(delete-region start end))))))))
(provide 'mm-archive)
;; mm-archive.el ends here
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