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;;; uudecode.el --- elisp native uudecode
;; Copyright (c) 1998, 1999, 2000 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 2, 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Lots of codes are stolen from mm-decode.el, gnus-uu.el and
;; base64.el
;; This looks as though it could be made rather more efficient for
;; internal working. Encoding could use a lookup table and decoding
;; should presumably use a vector or list buffer for partial results
;; rather than with-current-buffer. -- fx
;; Only `uudecode-decode-region' should be advertised, and whether or
;; not that uses a program should be customizable, but I guess it's
;; too late now. -- fx
;;; Code:
(eval-when-compile (require 'cl))
(eval-and-compile
(defalias 'uudecode-char-int
(if (fboundp 'char-int)
'char-int
'identity))
(if (featurep 'xemacs)
(defalias 'uudecode-insert-char 'insert-char)
(defun uudecode-insert-char (char &optional count ignored buffer)
(if (or (null buffer) (eq buffer (current-buffer)))
(insert-char char count)
(with-current-buffer buffer
(insert-char char count))))))
(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 'gnus-extract)
(defcustom uudecode-decoder-switches nil
"*List of command line flags passed to `uudecode-decoder-program'."
:group 'gnus-extract
:type '(repeat string))
(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)
(let ((temporary-file-directory
uudecode-temporary-file-directory))
(make-temp-file "uu"))))
(let ((cdir default-directory)
default-process-coding-system)
(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 (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 ((work-buffer nil)
(done nil)
(counter 0)
(remain 0)
(bits 0)
(lim 0) inputpos
(non-data-chars (concat "^" uudecode-alphabet)))
(unwind-protect
(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))))))
(setq work-buffer (generate-new-buffer " *uudecode-work*"))
(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)
(uudecode-insert-char
(lsh bits -16) 1 nil work-buffer)
(uudecode-insert-char
(logand (lsh bits -8) 255) 1 nil work-buffer)
(uudecode-insert-char (logand bits 255) 1 nil
work-buffer)
(setq bits 0 counter 0))
(t (setq bits (lsh bits 6)))))))
(cond
(done)
((> 0 remain)
(error "uucode line ends unexpectly")
(setq done t))
((and (= (point) end) (not done))
;;(error "uucode ends unexpectly")
(setq done t))
((= counter 3)
(uudecode-insert-char (logand (lsh bits -16) 255) 1 nil
work-buffer)
(uudecode-insert-char (logand (lsh bits -8) 255) 1 nil
work-buffer))
((= counter 2)
(uudecode-insert-char (logand (lsh bits -10) 255) 1 nil
work-buffer)))
(skip-chars-forward non-data-chars end))
(if file-name
(save-excursion
(set-buffer work-buffer)
(write-file file-name))
(or (markerp end) (setq end (set-marker (make-marker) end)))
(goto-char start)
(insert-buffer-substring work-buffer)
(delete-region (point) end))))
(and work-buffer (kill-buffer work-buffer)))))
(provide 'uudecode)
;;; uudecode.el ends here
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