emacs/lisp/mail/uudecode.el
Paul Eggert bc511a64f6 Prefer HTTPS to FTP and HTTP in documentation
Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.
2017-09-13 15:54:37 -07:00

238 lines
7.3 KiB
EmacsLisp

;;; 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 <https://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