1 ;;; uudecode.el -- elisp native uudecode
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006 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 2, or (at your option)
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; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
30 (eval-when-compile (require 'cl))
33 (defalias 'uudecode-char-int
34 (if (fboundp 'char-int)
38 (defcustom uudecode-decoder-program "uudecode"
39 "*Non-nil value should be a string that names a uu decoder.
40 The program should expect to read uu data on its standard
41 input and write the converted data to its standard output."
45 (defcustom uudecode-decoder-switches nil
46 "*List of command line flags passed to `uudecode-decoder-program'."
48 :type '(repeat string))
50 (defcustom uudecode-use-external
51 (executable-find uudecode-decoder-program)
52 "*Use external uudecode program."
57 (defconst uudecode-alphabet "\040-\140")
59 (defconst uudecode-begin-line "^begin[ \t]+[0-7][0-7][0-7][ \t]+\\(.*\\)$")
60 (defconst uudecode-end-line "^end[ \t]*$")
62 (defconst uudecode-body-line
63 (let ((i 61) (str "^M"))
64 (while (> (setq i (1- i)) 0)
65 (setq str (concat str "[^a-z]")))
68 (defvar uudecode-temporary-file-directory
69 (cond ((fboundp 'temp-directory) (temp-directory))
70 ((boundp 'temporary-file-directory) temporary-file-directory)
74 (defun uudecode-decode-region-external (start end &optional file-name)
75 "Uudecode region between START and END using external program.
76 If FILE-NAME is non-nil, save the result to FILE-NAME. The program
77 used is specified by `uudecode-decoder-program'."
79 (let ((cbuf (current-buffer)) tempfile firstline status)
82 (when (re-search-forward uudecode-begin-line nil t)
84 (setq firstline (point))
85 (cond ((null file-name))
88 (setq file-name (read-file-name "File to Name:"
91 (setq tempfile (if file-name
92 (expand-file-name file-name)
93 (if (fboundp 'make-temp-file)
94 (let ((temporary-file-directory
95 uudecode-temporary-file-directory))
96 (make-temp-file "uu"))
99 uudecode-temporary-file-directory))))
100 (let ((cdir default-directory)
101 (default-process-coding-system
102 (if (featurep 'xemacs)
103 ;; In XEmacs, `nil' is not a valid coding system.
108 (insert "begin 600 " (file-name-nondirectory tempfile) "\n")
109 (insert-buffer-substring cbuf firstline end)
110 (cd (file-name-directory tempfile))
111 (apply 'call-process-region
114 uudecode-decoder-program
118 uudecode-decoder-switches))
119 (cd cdir) (set-buffer cbuf)))
120 (if (file-exists-p tempfile)
123 (delete-region start end)
125 (insert-file-contents-literally tempfile)))
126 (message "Can not uudecode")))
127 (ignore-errors (or file-name (delete-file tempfile))))))
130 (defun uudecode-decode-region-internal (start end &optional file-name)
131 "Uudecode region between START and END without using an external program.
132 If FILE-NAME is non-nil, save the result to FILE-NAME."
138 (lim 0) inputpos result
139 (non-data-chars (concat "^" uudecode-alphabet)))
142 (when (re-search-forward uudecode-begin-line nil t)
143 (cond ((null file-name))
144 ((stringp file-name))
146 (setq file-name (expand-file-name
147 (read-file-name "File to Name:"
149 (match-string 1))))))
151 (skip-chars-forward non-data-chars end)
153 (setq inputpos (point))
154 (setq remain 0 bits 0 counter 0)
156 ((> (skip-chars-forward uudecode-alphabet end) 0)
159 (logand (- (uudecode-char-int (char-after inputpos)) 32)
161 (setq inputpos (1+ inputpos))
162 (if (= remain 0) (setq done t))
163 (while (and (< inputpos lim) (> remain 0))
167 (uudecode-char-int (char-after inputpos)) 32)
169 (if (/= counter 0) (setq remain (1- remain)))
170 (setq counter (1+ counter)
171 inputpos (1+ inputpos))
175 (char-to-string (lsh bits -16))
176 (char-to-string (logand (lsh bits -8) 255))
177 (char-to-string (logand bits 255)))
179 (setq bits 0 counter 0))
180 (t (setq bits (lsh bits 6)))))))
184 (error "uucode line ends unexpectly")
186 ((and (= (point) end) (not done))
187 ;;(error "uucode ends unexpectly")
192 (char-to-string (logand (lsh bits -16) 255))
193 (char-to-string (logand (lsh bits -8) 255)))
197 (char-to-string (logand (lsh bits -10) 255))
199 (skip-chars-forward non-data-chars end))
201 (let (default-enable-multibyte-characters)
202 (with-temp-file file-name
203 (insert (apply 'concat (nreverse result)))))
204 (or (markerp end) (setq end (set-marker (make-marker) end)))
206 (insert (apply 'concat (nreverse result)))
207 (delete-region (point) end))))))
210 (defun uudecode-decode-region (start end &optional file-name)
211 "Uudecode region between START and END.
212 If FILE-NAME is non-nil, save the result to FILE-NAME."
213 (if uudecode-use-external
214 (uudecode-decode-region-external start end file-name)
215 (uudecode-decode-region-internal start end file-name)))
219 ;;; arch-tag: e1f09ed5-62b4-4677-9f13-4e81c4fe8ce3
220 ;;; uudecode.el ends here