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;;; uudecode.el --- elisp native uudecode -*- lexical-binding:t -*-
;; Copyright (C) 1998-2025 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(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)
(defcustom uudecode-decoder-switches nil
"List of command line flags passed to `uudecode-decoder-program'."
:type '(repeat string))
(defcustom uudecode-use-external
(not (not (executable-find uudecode-decoder-program)))
"Use external uudecode program."
:version "22.1"
: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 ".?$")))
(make-obsolete-variable 'uudecode-temporary-file-directory
'temporary-file-directory "28.1")
;;;###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)
(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)
(make-temp-file "uu")))
(let ((cdir default-directory)
(default-process-coding-system 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))))))
;;;###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 (- (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
(-
(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 (logand bits 255)
(cons (logand (ash bits -8) 255)
(cons (ash bits -16)
result))))
(setq bits 0 counter 0))
(t (setq bits (ash 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 (logand (ash bits -8) 255)
(cons (logand (ash bits -16) 255)
result))))
((= counter 2)
(setq result (cons (logand (ash bits -10) 255)
result))))
(skip-chars-forward non-data-chars end))
(if file-name
(with-temp-file file-name
(set-buffer-multibyte nil)
(apply #'insert (nreverse result)))
(or (markerp end) (setq end (set-marker (make-marker) end)))
(goto-char start)
(apply #'insert
(nreverse
(if enable-multibyte-characters
(mapcar (lambda (ch)
(or (decode-char 'eight-bit ch) ch))
result)
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)))
(define-obsolete-function-alias 'uudecode-char-int #'identity "28.1")
(provide 'uudecode)
;;; uudecode.el ends here
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