;;; rfc2047.el --- Functions for encoding and decoding rfc2047 messages
-;; Copyright (C) 1998,99 Free Software Foundation, Inc.
+;; Copyright (C) 1998-2000 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
"Encode the message header according to `rfc2047-header-encoding-alist'.
Should be called narrowed to the head of the message."
(interactive "*")
- (when (featurep 'mule)
- (save-excursion
- (goto-char (point-min))
- (let ((alist rfc2047-header-encoding-alist)
- elem method)
- (while (not (eobp))
- (save-restriction
- (rfc2047-narrow-to-field)
- (when (rfc2047-encodable-p)
- ;; We found something that may perhaps be encoded.
- (while (setq elem (pop alist))
- (when (or (and (stringp (car elem))
- (looking-at (car elem)))
- (eq (car elem) t))
- (setq alist nil
- method (cdr elem))))
- (when method
- (cond
- ((eq method 'mime)
- (rfc2047-encode-region (point-min) (point-max)))
- ;; Hm.
- (t))))
- (goto-char (point-max)))))
- (when mail-parse-charset
- (encode-coding-region (point-min) (point-max)
- mail-parse-charset)))))
-
-(defun rfc2047-encodable-p ()
- "Say whether the current (narrowed) buffer contains characters that need encoding."
- (let ((charsets (mapcar
- 'mm-mule-charset-to-mime-charset
- (mm-find-charset-region (point-min) (point-max))))
- (cs (list 'us-ascii mail-parse-charset))
+ (save-excursion
+ (goto-char (point-min))
+ (let ((alist rfc2047-header-encoding-alist)
+ elem method)
+ (while (not (eobp))
+ (save-restriction
+ (rfc2047-narrow-to-field)
+ (when (rfc2047-encodable-p)
+ ;; We found something that may perhaps be encoded.
+ (while (setq elem (pop alist))
+ (when (or (and (stringp (car elem))
+ (looking-at (car elem)))
+ (eq (car elem) t))
+ (setq alist nil
+ method (cdr elem))))
+ (cond
+ ((eq method 'mime)
+ (rfc2047-encode-region (point-min) (point-max))
+ (rfc2047-fold-region (point-min) (point-max)))
+ ;; Hm.
+ (t)))
+ (goto-char (point-max)))))
+ (when mail-parse-charset
+ (encode-coding-region
+ (point-min) (point-max) mail-parse-charset))))
+
+(defun rfc2047-encodable-p (&optional header)
+ "Say whether the current (narrowed) buffer contains characters that need encoding in headers."
+ (let ((charsets
+ (mapcar
+ 'mm-mime-charset
+ (mm-find-charset-region (point-min) (point-max))))
+ (cs (list 'us-ascii (car message-posting-charset)))
found)
(while charsets
(unless (memq (pop charsets) cs)
(defun rfc2047-dissect-region (b e)
"Dissect the region between B and E into words."
- (let (words)
+ (let ((all-specials (concat ietf-drums-tspecials " \t\n\r"))
+ (special-list (mapcar 'identity ietf-drums-tspecials))
+ (blank-list '(? ?\t ?\n ?\r))
+ words current cs state mail-parse-mule-charset)
(save-restriction
(narrow-to-region b e)
(goto-char (point-min))
- (while (re-search-forward
- (concat "[^" ietf-drums-tspecials " \t\n]+") nil t)
- (push
- (list (match-beginning 0) (match-end 0)
- (car (delq 'ascii (mm-find-charset-region
- (match-beginning 0) (match-end 0)))))
- words))
- words)))
+ (skip-chars-forward all-specials)
+ (setq b (point))
+ (while (not (eobp))
+ (cond
+ ((not state)
+ (if (memq (char-after) blank-list)
+ (setq state 'blank)
+ (setq state 'word)
+ (if (not (eq (setq cs (mm-charset-after)) 'ascii))
+ (setq current cs)))
+ (setq b (point)))
+ ((eq state 'blank)
+ (cond
+ ((memq (char-after) special-list)
+ (setq state nil))
+ ((memq (char-after) blank-list))
+ (t
+ (setq state 'word)
+ (if (not (eq (setq cs (mm-charset-after)) 'ascii))
+ (setq current cs)))))
+ ((eq state 'word)
+ (cond
+ ((memq (char-after) special-list)
+ (setq state nil)
+ (push (list b (point) current) words)
+ (setq current nil))
+ ((memq (char-after) blank-list)
+ (setq state 'blank)
+ (push (list b (point) current) words)
+ (setq current nil)
+ (setq b (point)))
+ ((or (eq (setq cs (mm-charset-after)) 'ascii)
+ (if current
+ (eq current cs)
+ (setq current cs))))
+ (t
+ (push (list b (point) current) words)
+ (setq current cs)
+ (setq b (point))))))
+ (if state
+ (forward-char)
+ (skip-chars-forward all-specials)))
+ (if (eq state 'word)
+ (push (list b (point) current) words)))
+ words))
(defun rfc2047-encode-region (b e)
"Encode all encodable words in REGION."
(defun rfc2047-encode (b e charset)
"Encode the word in the region with CHARSET."
- (let* ((mime-charset
- (mm-mime-charset charset b e))
+ (let* ((mime-charset (mm-mime-charset charset))
(encoding (or (cdr (assq mime-charset
- rfc2047-charset-encoding-alist))
+ rfc2047-charset-encoding-alist))
'B))
(start (concat
"=?" (downcase (symbol-name mime-charset)) "?"
(first t))
(save-restriction
(narrow-to-region b e)
- (mm-encode-coding-region b e mime-charset)
+ (when (eq encoding 'B)
+ ;; break into lines before encoding
+ (goto-char (point-min))
+ (while (not (eobp))
+ (goto-char (min (point-max) (+ 15 (point))))
+ (unless (eobp)
+ (insert "\n"))))
+ (mm-encode-coding-region (point-min) (point-max) mime-charset)
(funcall (cdr (assq encoding rfc2047-encoding-function-alist))
(point-min) (point-max))
(goto-char (point-min))
(insert "?=")
(forward-line 1)))))
+(defun rfc2047-fold-region (b e)
+ "Fold the long lines in the region."
+ (save-restriction
+ (narrow-to-region b e)
+ (goto-char (point-min))
+ (let ((break nil))
+ (while (not (eobp))
+ (cond
+ ((memq (char-after) '(? ?\t))
+ (setq break (point)))
+ ((and (not break)
+ (looking-at "=\\?"))
+ (setq break (point)))
+ ((and (looking-at "\\?=")
+ (> (- (point) (save-excursion (beginning-of-line) (point))) 76))
+ (goto-char break)
+ (setq break nil)
+ (insert "\n ")))
+ (unless (eobp)
+ (forward-char 1))))))
+
(defun rfc2047-b-encode-region (b e)
"Encode the header contained in REGION with the B encoding."
- (base64-encode-region b e t)
- (goto-char (point-min))
- (while (not (eobp))
- (goto-char (min (point-max) (+ 64 (point))))
- (unless (eobp)
- (insert "\n"))))
+ (save-restriction
+ (narrow-to-region (goto-char b) e)
+ (while (not (eobp))
+ (base64-encode-region (point) (progn (end-of-line) (point)) t)
+ (if (and (bolp) (eolp))
+ (delete-backward-char 1))
+ (forward-line))))
(defun rfc2047-q-encode-region (b e)
"Encode the header contained in REGION with the Q encoding."
(prog1
(match-string 0)
(delete-region (match-beginning 0) (match-end 0)))))
- (when (and (mm-multibyte-p) mail-parse-charset)
+ (when (and (mm-multibyte-p)
+ mail-parse-charset
+ (not (eq mail-parse-charset 'gnus-decoded)))
(mm-decode-coding-region b e mail-parse-charset))
(setq b (point)))
(when (and (mm-multibyte-p)
mail-parse-charset
- (not (eq mail-parse-charset 'us-ascii)))
+ (not (eq mail-parse-charset 'us-ascii))
+ (not (eq mail-parse-charset 'gnus-decoded)))
(mm-decode-coding-region b (point-max) mail-parse-charset))))))
(defun rfc2047-decode-string (string)
(inline
(rfc2047-decode-region (point-min) (point-max)))
(buffer-string))))
-
+
(defun rfc2047-parse-and-decode (word)
"Decode WORD and return it if it is an encoded word.
Return WORD if not."
"Decode STRING that uses CHARSET with ENCODING.
Valid ENCODINGs are \"B\" and \"Q\".
If your Emacs implementation can't decode CHARSET, it returns nil."
+ (if (stringp charset)
+ (setq charset (intern (downcase charset))))
+ (if (or (not charset)
+ (eq 'gnus-all mail-parse-ignored-charsets)
+ (memq 'gnus-all mail-parse-ignored-charsets)
+ (memq charset mail-parse-ignored-charsets))
+ (setq charset mail-parse-charset))
(let ((cs (mm-charset-to-coding-system charset)))
+ (if (and (not cs) charset
+ (listp mail-parse-ignored-charsets)
+ (memq 'gnus-unknown mail-parse-ignored-charsets))
+ (setq cs (mm-charset-to-coding-system mail-parse-charset)))
(when cs
(when (and (eq cs 'ascii)
mail-parse-charset)
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