;;; rfc2047.el --- Functions for encoding and decoding rfc2047 messages
-;; Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;; Code:
-(eval-when-compile (require 'cl))
+(eval-when-compile
+ (require 'cl)
+ (defvar message-posting-charset))
(require 'qp)
(require 'mm-util)
(defvar rfc2047-header-encoding-alist
'(("Newsgroups" . nil)
+ ("Followup-To" . nil)
("Message-ID" . nil)
("\\(Resent-\\)?\\(From\\|Cc\\|To\\|Bcc\\|Reply-To\\|Sender\\)" .
"-A-Za-z0-9!*+/=_")
(iso-8859-4 . Q)
(iso-8859-5 . B)
(koi8-r . B)
- (iso-8859-7 . Q)
- (iso-8859-8 . Q)
+ (iso-8859-7 . B)
+ (iso-8859-8 . B)
(iso-8859-9 . Q)
(iso-8859-14 . Q)
(iso-8859-15 . Q)
(iso-2022-jp-2 . B)
(iso-2022-int-1 . B))
"Alist of MIME charsets to RFC2047 encodings.
-Valid encodings are nil, `Q' and `B'.")
+Valid encodings are nil, `Q' and `B'. These indicate binary (no) encoding,
+quoted-printable and base64 respectively.")
(defvar rfc2047-encoding-function-alist
'((Q . rfc2047-q-encode-region)
'(("\\(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. Some versions of Emacs has bug!
+ ;; 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.")
(point-max))))
(goto-char (point-min)))
+(defun rfc2047-field-value ()
+ "Return the value of the field at point."
+ (save-excursion
+ (save-restriction
+ (rfc2047-narrow-to-field)
+ (re-search-forward ":[ \t\n]*" nil t)
+ (buffer-substring (point) (point-max)))))
+
(defun rfc2047-encode-message-header ()
"Encode the message header according to `rfc2047-header-encoding-alist'.
Should be called narrowed to the head of the message."
(save-restriction
(rfc2047-narrow-to-field)
(if (not (rfc2047-encodable-p))
- (if (and (eq (mm-body-7-or-8) '8bit)
- (mm-multibyte-p)
- (mm-coding-system-p
- (car message-posting-charset)))
- ;; 8 bit must be decoded.
- ;; Is message-posting-charset a coding system?
- (mm-encode-coding-region
- (point-min) (point-max)
- (car message-posting-charset)))
+ (prog1
+ (if (and (eq (mm-body-7-or-8) '8bit)
+ (mm-multibyte-p)
+ (mm-coding-system-p
+ (car message-posting-charset)))
+ ;; 8 bit must be decoded.
+ ;; Is message-posting-charset a coding system?
+ (mm-encode-coding-region
+ (point-min) (point-max)
+ (car message-posting-charset))
+ nil)
+ ;; No encoding necessary, but folding is nice
+ (rfc2047-fold-region
+ (save-excursion
+ (goto-char (point-min))
+ (skip-chars-forward "^:")
+ (when (looking-at ": ")
+ (forward-char 2))
+ (point))
+ (point-max)))
;; We found something that may perhaps be encoded.
(setq method nil
alist rfc2047-header-encoding-alist)
mail-parse-charset)
(mm-encode-coding-region (point-min) (point-max)
mail-parse-charset)))
+ ;; We get this when CC'ing messsages to newsgroups with
+ ;; 8-bit names. The group name mail copy just get
+ ;; unconditionally encoded. Previously, it would ask
+ ;; whether to encode, which was quite confusing for the
+ ;; user. If the new behaviour is wrong, tell me. I have
+ ;; left the old code commented out below.
+ ;; -- Per Abrahamsen <abraham@dina.kvl.dk> Date: 2001-10-07.
((null method)
- (and (delq 'ascii
- (mm-find-charset-region (point-min)
- (point-max)))
- (if (or (message-options-get
- 'rfc2047-encode-message-header-encode-any)
- (message-options-set
- 'rfc2047-encode-message-header-encode-any
- (y-or-n-p
- "Some texts are not encoded. Encode anyway?")))
- (rfc2047-encode-region (point-min) (point-max))
- (error "Cannot send unencoded text."))))
+ (when (delq 'ascii
+ (mm-find-charset-region (point-min) (point-max)))
+ (rfc2047-encode-region (point-min) (point-max))))
+;;; ((null method)
+;;; (and (delq 'ascii
+;;; (mm-find-charset-region (point-min)
+;;; (point-max)))
+;;; (if (or (message-options-get
+;;; 'rfc2047-encode-message-header-encode-any)
+;;; (message-options-set
+;;; 'rfc2047-encode-message-header-encode-any
+;;; (y-or-n-p
+;;; "Some texts are not encoded. Encode anyway?")))
+;;; (rfc2047-encode-region (point-min) (point-max))
+;;; (error "Cannot send unencoded text"))))
((mm-coding-system-p method)
(if (and (featurep 'mule)
(if (boundp 'default-enable-multibyte-characters)
(t)))
(goto-char (point-max)))))))
+;; Fixme: This, and the require below may not be the Right Thing, but
+;; should be safe just before release. -- fx 2001-02-08
+(eval-when-compile (defvar message-posting-charset))
+
(defun rfc2047-encodable-p ()
"Return non-nil if any characters in current buffer need encoding in headers.
The buffer may be narrowed."
+ (require 'message) ; for message-posting-charset
(let ((charsets
(mapcar
'mm-mime-charset
result))
(defun rfc2047-encode-region (b e &optional word-chars)
- "Encode all encodable words in region."
+ "Encode all encodable words in region B to E."
(let ((words (rfc2047-dissect-region b e word-chars)) word)
(save-restriction
(narrow-to-region b e)
(insert "?=")
(forward-line 1)))))
+(defun rfc2047-fold-field ()
+ "Fold the current line."
+ (save-excursion
+ (save-restriction
+ (rfc2047-narrow-to-field)
+ (rfc2047-fold-region (point-min) (point-max)))))
+
(defun rfc2047-fold-region (b e)
- "Fold long lines in the region."
+ "Fold long lines in region B to E."
(save-restriction
(narrow-to-region b e)
(goto-char (point-min))
(let ((break nil)
(qword-break nil)
+ (first t)
(bol (save-restriction
(widen)
(gnus-point-at-bol))))
(while (not (eobp))
- (when (and (or break qword-break) (> (- (point) bol) 76))
+ (when (and (or break qword-break)
+ (> (- (point) bol) 76))
(goto-char (or break qword-break))
(setq break nil
qword-break nil)
- (if (looking-at " \t")
+ (if (looking-at "[ \t]")
(insert "\n")
(insert "\n "))
(setq bol (1- (point)))
;; Don't break before the first non-LWSP characters.
(skip-chars-forward " \t")
- (forward-char 1))
+ (unless (eobp)
+ (forward-char 1)))
(cond
((eq (char-after) ?\n)
(forward-char 1)
(forward-char 1))
((memq (char-after) '(? ?\t))
(skip-chars-forward " \t")
- (setq break (1- (point))))
+ (if first
+ ;; Don't break just after the header name.
+ (setq first nil)
+ (setq break (1- (point)))))
((not break)
(if (not (looking-at "=\\?[^=]"))
(if (eq (char-after) ?=)
(skip-chars-forward "^ \t\n\r")))
(t
(skip-chars-forward "^ \t\n\r"))))
- (when (and (or break qword-break) (> (- (point) bol) 76))
+ (when (and (or break qword-break)
+ (> (- (point) bol) 76))
(goto-char (or break qword-break))
(setq break nil
qword-break nil)
- (if (looking-at " \t")
+ (if (looking-at "[ \t]")
(insert "\n")
(insert "\n "))
(setq bol (1- (point)))
;; Don't break before the first non-LWSP characters.
(skip-chars-forward " \t")
- (forward-char 1)))))
+ (unless (eobp)
+ (forward-char 1))))))
+
+(defun rfc2047-unfold-field ()
+ "Fold the current line."
+ (save-excursion
+ (save-restriction
+ (rfc2047-narrow-to-field)
+ (rfc2047-unfold-region (point-min) (point-max)))))
(defun rfc2047-unfold-region (b e)
- "Unfold lines in the region."
+ "Unfold lines in region B to E."
(save-restriction
(narrow-to-region b e)
(goto-char (point-min))
(let ((bol (save-restriction
(widen)
(gnus-point-at-bol)))
- (eol (gnus-point-at-eol))
- leading)
+ (eol (gnus-point-at-eol)))
(forward-line 1)
(while (not (eobp))
- (looking-at "[ \t]*")
- (setq leading (- (match-end 0) (match-beginning 0)))
- (if (< (- (gnus-point-at-eol) bol leading) 76)
- (progn
- (goto-char eol)
- (delete-region eol (progn
- (skip-chars-forward "[ \t\n\r]+")
- (1- (point)))))
+ (if (and (looking-at "[ \t]")
+ (< (- (gnus-point-at-eol) bol) 76))
+ (delete-region eol (progn
+ (goto-char eol)
+ (skip-chars-forward "\r\n")
+ (point)))
(setq bol (gnus-point-at-bol)))
(setq eol (gnus-point-at-eol))
(forward-line 1)))))
(gnus-point-at-bol))))
(while alist
(when (looking-at (caar alist))
- (quoted-printable-encode-region b e nil (cdar alist))
+ (mm-with-unibyte-current-buffer-mule4
+ (quoted-printable-encode-region
+ (point-min) (point-max) nil (cdar alist)))
(subst-char-in-region (point-min) (point-max) ? ?_)
(setq alist nil))
(pop alist))
(prog1
(match-string 0)
(delete-region (match-beginning 0) (match-end 0)))))
+ ;; Remove newlines between decoded words. Though such things
+ ;; must not be essentially there.
+ (save-restriction
+ (narrow-to-region e (point))
+ (goto-char e)
+ (while (re-search-forward "[\n\r]+" nil t)
+ (replace-match " "))
+ (goto-char (point-max)))
(when (and (mm-multibyte-p)
mail-parse-charset
+ (not (eq mail-parse-charset 'us-ascii))
(not (eq mail-parse-charset 'gnus-decoded)))
(mm-decode-coding-region b e mail-parse-charset))
(setq b (point)))
mail-parse-charset
(not (eq mail-parse-charset 'us-ascii))
(not (eq mail-parse-charset 'gnus-decoded)))
- (mm-decode-coding-region b (point-max) mail-parse-charset))
- (rfc2047-unfold-region (point-min) (point-max))))))
+ (mm-decode-coding-region-safely b (point-max) mail-parse-charset))))))
(defun rfc2047-decode-string (string)
"Decode the quoted-printable-encoded STRING and return the results."
(let ((m (mm-multibyte-p)))
- (with-temp-buffer
- (when m
- (mm-enable-multibyte))
- (insert string)
- (inline
- (rfc2047-decode-region (point-min) (point-max)))
- (buffer-string))))
+ (if (string-match "=\\?" string)
+ (with-temp-buffer
+ (when m
+ (mm-enable-multibyte))
+ (insert string)
+ (inline
+ (rfc2047-decode-region (point-min) (point-max)))
+ (buffer-string))
+ (if (and m
+ mail-parse-charset
+ (not (eq mail-parse-charset 'us-ascii))
+ (not (eq mail-parse-charset 'gnus-decoded)))
+ (let* ((decoded (mm-decode-coding-string string mail-parse-charset))
+ (charsets (find-charset-string decoded)))
+ (if (or (memq 'eight-bit-control charsets)
+ (memq 'eight-bit-graphic charsets))
+ (mm-decode-coding-string string 'undecided)
+ decoded))
+ string))))
(defun rfc2047-parse-and-decode (word)
"Decode WORD and return it if it is an encoded word.