'(("Newsgroups" . nil)
("Followup-To" . nil)
("Message-ID" . nil)
- ("\\(Resent-\\)?\\(From\\|Cc\\|To\\|Bcc\\|Reply-To\\|Sender\\)" .
- address-mime)
+ ("\\(Resent-\\)?\\(From\\|Cc\\|To\\|Bcc\\|Reply-To\\|Sender\
+\\|Mail-Followup-To\\|Mail-Copies-To\\|Approved\\)" . address-mime)
(t . mime))
"*Header/encoding method alist.
The list is traversed sequentially. The keys can either be
(cn-gb-2312 . B)
(euc-kr . B)
(iso-2022-jp-2 . B)
- (iso-2022-int-1 . B))
+ (iso-2022-int-1 . B)
+ (viscii . Q))
"Alist of MIME charsets to RFC2047 encodings.
Valid encodings are nil, `Q' and `B'. These indicate binary (no) encoding,
quoted-printable and base64 respectively.")
(nil . ignore))
"Alist of RFC2047 encodings to encoding functions.")
-(defvar rfc2047-q-encoding-alist
- '(("\\(Resent-\\)?\\(From\\|Cc\\|To\\|Bcc\\|Reply-To\\|Sender\\):"
- . "-A-Za-z0-9!*+/" )
- ;; = (\075), _ (\137), ? (\077) are used in the encoded word.
- ;; Avoid using 8bit characters.
- ;; Equivalent to "^\000-\007\011\013\015-\037\200-\377=_?"
- ("." . "\010\012\014\040-\074\076\100-\136\140-\177"))
- "Alist of header regexps and valid Q characters.")
-
;;;
;;; Functions for encoding RFC2047 messages
;;;
(progn
(forward-line 1)
(if (re-search-forward "^[^ \n\t]" nil t)
- (progn
- (beginning-of-line)
- (point))
+ (rfc2047-point-at-bol)
(point-max))))
(goto-char (point-min)))
((eq method 'address-mime)
(rfc2047-encode-region (point) (point-max)))
((eq method 'mime)
- (let (rfc2047-encoding-type)
+ (let ((rfc2047-encoding-type 'mime))
(rfc2047-encode-region (point) (point-max))))
((eq method 'default)
(if (and (featurep 'mule)
(save-restriction
(narrow-to-region b e)
(if (eq 'mime rfc2047-encoding-type)
- ;; Simple case -- treat as single word.
+ ;; Simple case. Treat as single word after any initial ASCII
+ ;; part and before any tailing ASCII part. The leading ASCII
+ ;; is relevant for instance in Subject headers with `Re:' for
+ ;; interoperability with non-MIME clients, and we might as
+ ;; well avoid the tail too.
(progn
(goto-char (point-min))
;; Does it need encoding?
- (skip-chars-forward "\000-\177" e)
+ (skip-chars-forward "\000-\177")
(unless (eobp)
- (rfc2047-encode b e)))
+ (skip-chars-backward "^ \n") ; beginning of space-delimited word
+ (rfc2047-encode (point) (progn
+ (goto-char e)
+ (skip-chars-backward "\000-\177")
+ (skip-chars-forward "^ \n")
+ ;; end of space-delimited word
+ (point)))))
;; `address-mime' case -- take care of quoted words, comments.
(with-syntax-table rfc2047-syntax-table
(let ((start) ; start of current token
end (1+ end)))
(rfc2047-encode start end)
(setq last-encoded t)))))
- (error (error "Invalid data for rfc2047 encoding: %s"
- (buffer-substring b e)))))))
+ (error
+ (error "Invalid data for rfc2047 encoding: %s"
+ (buffer-substring b e)))))))
(rfc2047-fold-region b (point))))
(defun rfc2047-encode-string (string)
"Encode words in STRING.
By default, the string is treated as containing addresses (see
-`rfc2047-special-chars')."
+`rfc2047-encoding-type')."
(with-temp-buffer
(insert string)
(rfc2047-encode-region (point-min) (point-max))
(defun rfc2047-encode (b e)
"Encode the word(s) in the region B to E.
By default, the region is treated as containing addresses (see
-`rfc2047-special-chars')."
+`rfc2047-encoding-type')."
(let* ((mime-charset (mm-find-mime-charset-region b e))
(cs (if (> (length mime-charset) 1)
;; Fixme: Instead of this, try to break region into
(mm-charset-to-coding-system mime-charset)))
;; Fixme: Better, calculate the number of non-ASCII
;; characters, at least for 8-bit charsets.
- (encoding (if (assq mime-charset
- rfc2047-charset-encoding-alist)
- (cdr (assq mime-charset
+ (encoding (or (cdr (assq mime-charset
rfc2047-charset-encoding-alist))
- 'B))
+ ;; For the charsets that don't have a preferred
+ ;; encoding, choose the one that's shorter.
+ (save-restriction
+ (narrow-to-region b e)
+ (if (eq (mm-qp-or-base64) 'base64)
+ 'B
+ 'Q))))
(start (concat
"=?" (downcase (symbol-name mime-charset)) "?"
(downcase (symbol-name encoding)) "?"))
+ (factor (case mime-charset
+ ((iso-8859-5 iso-8859-7 iso-8859-8 koi8-r) 1)
+ ((big5 gb2312 euc-kr) 2)
+ (utf-8 4)
+ (t 8)))
+ (pre (- b (save-restriction
+ (widen)
+ (rfc2047-point-at-bol))))
+ ;; encoded-words must not be longer than 75 characters,
+ ;; including charset, encoding etc. This leaves us with
+ ;; 75 - (length start) - 2 - 2 characters. The last 2 is for
+ ;; possible base64 padding. In the worst case (iso-2022-*)
+ ;; each character expands to 8 bytes which is expanded by a
+ ;; factor of 4/3 by base64 encoding.
+ (length (floor (- 75 (length start) 4) (* factor (/ 4.0 3.0))))
+ ;; Limit line length to 76 characters.
+ (length1 (max 1 (floor (- 76 (length start) 4 pre)
+ (* factor (/ 4.0 3.0)))))
(first t))
(if mime-charset
(save-restriction
;; break into lines before encoding
(goto-char (point-min))
(while (not (eobp))
- (goto-char (min (point-max) (+ 15 (point))))
+ (if first
+ (progn
+ (goto-char (min (point-max) (+ length1 (point))))
+ (setq first nil))
+ (goto-char (min (point-max) (+ length (point)))))
(unless (eobp)
- (insert ?\n))))
+ (insert ?\n)))
+ (setq first t))
(if (and (mm-multibyte-p)
(mm-coding-system-p cs))
(mm-encode-coding-region (point-min) (point-max) cs))
(if (eq (char-after) ?=)
(forward-char 1)
(skip-chars-forward "^ \t\n\r="))
- (setq qword-break (point))
+ ;; Don't break at the start of the field.
+ (unless (= (point) b)
+ (setq qword-break (point)))
(skip-chars-forward "^ \t\n\r")))
(t
(skip-chars-forward "^ \t\n\r"))))
(save-excursion
(save-restriction
(narrow-to-region (goto-char b) e)
- (let ((alist rfc2047-q-encoding-alist)
- (bol (save-restriction
+ (let ((bol (save-restriction
(widen)
(rfc2047-point-at-bol))))
- (while alist
- (when (looking-at (caar alist))
- (quoted-printable-encode-region b e nil (cdar alist))
- (subst-char-in-region (point-min) (point-max) ? ?_)
- (setq alist nil))
- (pop alist))
+ (quoted-printable-encode-region
+ b e nil
+ ;; = (\075), _ (\137), ? (\077) are used in the encoded word.
+ ;; Avoid using 8bit characters.
+ ;; This list excludes `especials' (see the RFC2047 syntax),
+ ;; meaning that some characters in non-structured fields will
+ ;; get encoded when they con't need to be. The following is
+ ;; what it used to be.
+;;; ;; Equivalent to "^\000-\007\011\013\015-\037\200-\377=_?"
+;;; "\010\012\014\040-\074\076\100-\136\140-\177")
+ "-\b\n\f !#-'*+0-9A-Z\\^`-~\d")
+ (subst-char-in-region (point-min) (point-max) ? ?_)
;; The size of QP encapsulation is about 20, so set limit to
;; 56=76-20.
(unless (< (- (point-max) (point-min)) 56)
;; Also check whether it needs to worry about delimiting fields like
;; encoding.
+;; In fact it's reported that (invalid) encoding of mailboxes in
+;; addr-specs is in use, so delimiting fields might help. Probably
+;; not decoding a word which isn't properly delimited is good enough
+;; and worthwhile (is it more correct or not?), e.g. something like
+;; `=?iso-8859-1?q?foo?=@'.
+
(defun rfc2047-decode-region (start end)
"Decode MIME-encoded words in region between START and END."
(interactive "r")
(when (and (eq cs 'ascii)
mail-parse-charset)
(setq cs mail-parse-charset))
- ;; Fixme: What's this for? The following comment makes no sense. -- fx
- (mm-with-unibyte-current-buffer
- ;; In Emacs Mule 4, decoding UTF-8 should be in unibyte mode.
- (mm-decode-coding-string
- (cond
- ((equal "B" encoding)
- (base64-decode-string
- (rfc2047-pad-base64 string)))
- ((equal "Q" encoding)
- (quoted-printable-decode-string
- (mm-replace-chars-in-string string ?_ ? )))
- (t (error "Invalid encoding: %s" encoding)))
- cs)))))
+ (mm-decode-coding-string
+ (cond
+ ((equal "B" encoding)
+ (base64-decode-string
+ (rfc2047-pad-base64 string)))
+ ((equal "Q" encoding)
+ (quoted-printable-decode-string
+ (mm-replace-chars-in-string string ?_ ? )))
+ (t (error "Invalid encoding: %s" encoding)))
+ cs))))
(provide 'rfc2047)
projects / elisp / gnus.git- / blobdiff