1 ;;; uudecode.el -- elisp native uudecode
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
7 ;; Keywords: uudecode news
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
28 (eval-when-compile (require 'cl))
31 (defalias 'uudecode-char-int
32 (if (fboundp 'char-int)
36 (defgroup uudecode nil
37 "Decoding of uuencoded data."
41 (defcustom uudecode-decoder-program "uudecode"
42 "*Non-nil value should be a string that names a uu decoder.
43 The program should expect to read uu data on its standard
44 input and write the converted data to its standard output."
48 (defcustom uudecode-decoder-switches nil
49 "*List of command line flags passed to `uudecode-decoder-program'."
51 :type '(repeat string))
53 (defcustom uudecode-use-external
54 (executable-find uudecode-decoder-program)
55 "*Use external uudecode program."
60 (defconst uudecode-alphabet "\040-\140")
62 (defconst uudecode-begin-line "^begin[ \t]+[0-7][0-7][0-7][ \t]+\\(.*\\)$")
63 (defconst uudecode-end-line "^end[ \t]*$")
65 (defconst uudecode-body-line
66 (let ((i 61) (str "^M"))
67 (while (> (setq i (1- i)) 0)
68 (setq str (concat str "[^a-z]")))
71 (defvar uudecode-temporary-file-directory
72 (cond ((fboundp 'temp-directory) (temp-directory))
73 ((boundp 'temporary-file-directory) temporary-file-directory)
77 (defun uudecode-decode-region-external (start end &optional file-name)
78 "Uudecode region between START and END using external program.
79 If FILE-NAME is non-nil, save the result to FILE-NAME. The program
80 used is specified by `uudecode-decoder-program'."
82 (let ((cbuf (current-buffer)) tempfile firstline status)
85 (when (re-search-forward uudecode-begin-line nil t)
87 (setq firstline (point))
88 (cond ((null file-name))
91 (setq file-name (read-file-name "File to Name:"
94 (setq tempfile (if file-name
95 (expand-file-name file-name)
96 (if (fboundp 'make-temp-file)
97 (let ((temporary-file-directory
98 uudecode-temporary-file-directory))
99 (make-temp-file "uu"))
101 (make-temp-name "uu")
102 uudecode-temporary-file-directory))))
103 (let ((cdir default-directory)
104 (default-process-coding-system
105 (if (featurep 'xemacs)
106 ;; In XEmacs, `nil' is not a valid coding system.
111 (insert "begin 600 " (file-name-nondirectory tempfile) "\n")
112 (insert-buffer-substring cbuf firstline end)
113 (cd (file-name-directory tempfile))
114 (apply 'call-process-region
117 uudecode-decoder-program
121 uudecode-decoder-switches))
122 (cd cdir) (set-buffer cbuf)))
123 (if (file-exists-p tempfile)
126 (delete-region start end)
128 (insert-file-contents-literally tempfile)))
129 (message "Can not uudecode")))
130 (ignore-errors (or file-name (delete-file tempfile))))))
133 (defalias 'uudecode-string-to-multibyte
137 ((fboundp 'string-to-multibyte)
138 'string-to-multibyte)
141 "Return a multibyte string with the same individual chars as string."
143 (lambda (ch) (string-as-multibyte (char-to-string ch)))
147 (defun uudecode-decode-region-internal (start end &optional file-name)
148 "Uudecode region between START and END without using an external program.
149 If FILE-NAME is non-nil, save the result to FILE-NAME."
155 (lim 0) inputpos result
156 (non-data-chars (concat "^" uudecode-alphabet)))
159 (when (re-search-forward uudecode-begin-line nil t)
160 (cond ((null file-name))
161 ((stringp file-name))
163 (setq file-name (expand-file-name
164 (read-file-name "File to Name:"
166 (match-string 1))))))
168 (skip-chars-forward non-data-chars end)
170 (setq inputpos (point))
171 (setq remain 0 bits 0 counter 0)
173 ((> (skip-chars-forward uudecode-alphabet end) 0)
176 (logand (- (uudecode-char-int (char-after inputpos)) 32)
178 (setq inputpos (1+ inputpos))
179 (if (= remain 0) (setq done t))
180 (while (and (< inputpos lim) (> remain 0))
184 (uudecode-char-int (char-after inputpos)) 32)
186 (if (/= counter 0) (setq remain (1- remain)))
187 (setq counter (1+ counter)
188 inputpos (1+ inputpos))
192 (char-to-string (lsh bits -16))
193 (char-to-string (logand (lsh bits -8) 255))
194 (char-to-string (logand bits 255)))
196 (setq bits 0 counter 0))
197 (t (setq bits (lsh bits 6)))))))
201 (error "uucode line ends unexpectly")
203 ((and (= (point) end) (not done))
204 ;;(error "uucode ends unexpectly")
209 (char-to-string (logand (lsh bits -16) 255))
210 (char-to-string (logand (lsh bits -8) 255)))
214 (char-to-string (logand (lsh bits -10) 255))
216 (skip-chars-forward non-data-chars end))
218 (with-temp-file file-name
219 (unless (featurep 'xemacs) (set-buffer-multibyte nil))
220 (insert (apply 'concat (nreverse result))))
221 (or (markerp end) (setq end (set-marker (make-marker) end)))
223 (if enable-multibyte-characters
224 (dolist (x (nreverse result))
225 (insert (uudecode-string-to-multibyte x)))
226 (insert (apply 'concat (nreverse result))))
227 (delete-region (point) end))))))
230 (defun uudecode-decode-region (start end &optional file-name)
231 "Uudecode region between START and END.
232 If FILE-NAME is non-nil, save the result to FILE-NAME."
233 (if uudecode-use-external
234 (uudecode-decode-region-external start end file-name)
235 (uudecode-decode-region-internal start end file-name)))
239 ;;; uudecode.el ends here