summaryrefslogtreecommitdiff
path: root/lisp/mail/uudecode.el
blob: e68acbd2b8fe6e2855cdb53ac0f82626906e3536 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
;;; uudecode.el -- elisp native uudecode

;; Copyright (C) 1998-2017 Free Software Foundation, Inc.

;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
;; Keywords: uudecode news

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; Code:

(eval-when-compile (require 'cl))

(eval-and-compile
  (defalias 'uudecode-char-int
    (if (fboundp 'char-int)
	'char-int
      'identity)))

(defgroup uudecode nil
  "Decoding of uuencoded data."
  :group 'mail
  :group 'news)

(defcustom uudecode-decoder-program "uudecode"
  "Non-nil value should be a string that names a uu decoder.
The program should expect to read uu data on its standard
input and write the converted data to its standard output."
  :type 'string
  :group 'uudecode)

(defcustom uudecode-decoder-switches nil
  "List of command line flags passed to `uudecode-decoder-program'."
  :group 'uudecode
  :type '(repeat string))

(defcustom uudecode-use-external
  (executable-find uudecode-decoder-program)
  "Use external uudecode program."
  :version "22.1"
  :group 'uudecode
  :type 'boolean)

(defconst uudecode-alphabet "\040-\140")

(defconst uudecode-begin-line "^begin[ \t]+[0-7][0-7][0-7][ \t]+\\(.*\\)$")
(defconst uudecode-end-line "^end[ \t]*$")

(defconst uudecode-body-line
  (let ((i 61) (str "^M"))
    (while (> (setq i (1- i)) 0)
      (setq str (concat str "[^a-z]")))
    (concat str ".?$")))

(defvar uudecode-temporary-file-directory
  (cond ((fboundp 'temp-directory) (temp-directory))
	((boundp 'temporary-file-directory) temporary-file-directory)
	("/tmp")))

;;;###autoload
(defun uudecode-decode-region-external (start end &optional file-name)
  "Uudecode region between START and END using external program.
If FILE-NAME is non-nil, save the result to FILE-NAME.  The program
used is specified by `uudecode-decoder-program'."
  (interactive "r\nP")
  (let ((cbuf (current-buffer)) tempfile firstline status)
    (save-excursion
      (goto-char start)
      (when (re-search-forward uudecode-begin-line nil t)
	(forward-line 1)
	(setq firstline (point))
	(cond ((null file-name))
	      ((stringp file-name))
	      (t
	       (setq file-name (read-file-name "File to Name:"
					       nil nil nil
					       (match-string 1)))))
	(setq tempfile (if file-name
			   (expand-file-name file-name)
			   (if (fboundp 'make-temp-file)
			       (let ((temporary-file-directory
				      uudecode-temporary-file-directory))
				 (make-temp-file "uu"))
			     (expand-file-name
			      (make-temp-name "uu")
			      uudecode-temporary-file-directory))))
	(let ((cdir default-directory)
	      (default-process-coding-system
		(if (featurep 'xemacs)
		    ;; In XEmacs, nil is not a valid coding system.
		    '(binary . binary)
		  nil)))
	  (unwind-protect
	      (with-temp-buffer
		(insert "begin 600 " (file-name-nondirectory tempfile) "\n")
		(insert-buffer-substring cbuf firstline end)
		(cd (file-name-directory tempfile))
		(apply 'call-process-region
		       (point-min)
		       (point-max)
		       uudecode-decoder-program
		       nil
		       nil
		       nil
		       uudecode-decoder-switches))
	    (cd cdir) (set-buffer cbuf)))
	(if (file-exists-p tempfile)
	    (unless file-name
	      (goto-char start)
	      (delete-region start end)
	      (let (format-alist)
		(insert-file-contents-literally tempfile)))
	  (message "Can not uudecode")))
      (ignore-errors (or file-name (delete-file tempfile))))))

(eval-and-compile
  (defalias 'uudecode-string-to-multibyte
    (cond
     ((featurep 'xemacs)
      'identity)
     ((fboundp 'string-to-multibyte)
      'string-to-multibyte)
     (t
      (lambda (string)
	"Return a multibyte string with the same individual chars as string."
	(mapconcat
	 (lambda (ch) (string-as-multibyte (char-to-string ch)))
	 string ""))))))

;;;###autoload
(defun uudecode-decode-region-internal (start end &optional file-name)
  "Uudecode region between START and END without using an external program.
If FILE-NAME is non-nil, save the result to FILE-NAME."
  (interactive "r\nP")
  (let ((done nil)
	(counter 0)
	(remain 0)
	(bits 0)
	(lim 0) inputpos result
	(non-data-chars (concat "^" uudecode-alphabet)))
    (save-excursion
      (goto-char start)
      (when (re-search-forward uudecode-begin-line nil t)
	(cond ((null file-name))
	      ((stringp file-name))
	      (t
	       (setq file-name (expand-file-name
				(read-file-name "File to Name:"
						nil nil nil
						(match-string 1))))))
	(forward-line 1)
	(skip-chars-forward non-data-chars end)
	(while (not done)
	  (setq inputpos (point))
	  (setq remain 0 bits 0 counter 0)
	  (cond
	   ((> (skip-chars-forward uudecode-alphabet end) 0)
	    (setq lim (point))
	    (setq remain
		  (logand (- (uudecode-char-int (char-after inputpos)) 32)
			  63))
	    (setq inputpos (1+ inputpos))
	    (if (= remain 0) (setq done t))
	    (while (and (< inputpos lim) (> remain 0))
	      (setq bits (+ bits
			    (logand
			     (-
			      (uudecode-char-int (char-after inputpos)) 32)
			     63)))
	      (if (/= counter 0) (setq remain (1- remain)))
	      (setq counter (1+ counter)
		    inputpos (1+ inputpos))
	      (cond ((= counter 4)
		     (setq result (cons
				   (concat
				    (char-to-string (lsh bits -16))
				    (char-to-string (logand (lsh bits -8) 255))
				    (char-to-string (logand bits 255)))
				   result))
		     (setq bits 0 counter 0))
		    (t (setq bits (lsh bits 6)))))))
	  (cond
	   (done)
	   ((> 0 remain)
	    (error "uucode line ends unexpectedly")
	    (setq done t))
	   ((and (= (point) end) (not done))
	    ;;(error "uucode ends unexpectedly")
	    (setq done t))
	   ((= counter 3)
	    (setq result (cons
			  (concat
			   (char-to-string (logand (lsh bits -16) 255))
			   (char-to-string (logand (lsh bits -8) 255)))
			  result)))
	   ((= counter 2)
	    (setq result (cons
			  (char-to-string (logand (lsh bits -10) 255))
			  result))))
	  (skip-chars-forward non-data-chars end))
	(if file-name
            (with-temp-file file-name
              (unless (featurep 'xemacs) (set-buffer-multibyte nil))
              (insert (apply 'concat (nreverse result))))
	  (or (markerp end) (setq end (set-marker (make-marker) end)))
	  (goto-char start)
	  (if enable-multibyte-characters
	      (dolist (x (nreverse result))
                (insert (uudecode-string-to-multibyte x)))
	    (insert (apply 'concat (nreverse result))))
	  (delete-region (point) end))))))

;;;###autoload
(defun uudecode-decode-region (start end &optional file-name)
  "Uudecode region between START and END.
If FILE-NAME is non-nil, save the result to FILE-NAME."
  (if uudecode-use-external
      (uudecode-decode-region-external start end file-name)
    (uudecode-decode-region-internal start end file-name)))

(provide 'uudecode)

;;; uudecode.el ends here