-;;; rfc2047.el --- Functions for encoding and decoding rfc2047 messages
-;; Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+;;; rfc2047.el --- functions for encoding and decoding rfc2047 messages
+;; Copyright (C) 1998, 1999, 2000, 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)
-(require 'ietf-drums)
+;; Fixme: Avoid this (used for mail-parse-charset) mm dependence on gnus.
(require 'mail-prsvr)
(require 'base64)
-;; Fixme: Avoid this (for gnus-point-at-...) mm dependence on gnus.
-(require 'gnus-util)
(autoload 'mm-body-7-or-8 "mm-bodies")
(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!*+/=_")
+ ("\\(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
1) nil, in which case no encoding is done;
2) `mime', in which case the header will be encoded according to RFC2047;
-3) a charset, in which case it will be encoded as that charset;
-4) `default', in which case the field will be encoded as the rest
- of the article.
-5) a string, like `mime', expect for using it as word-chars.")
+3) `address-mime', like `mime', but takes account of the rules for address
+ fields (where quoted strings and comments must be treated separately);
+4) a charset, in which case it will be encoded as that charset;
+5) `default', in which case the field will be encoded as the rest
+ of the article.")
(defvar rfc2047-charset-encoding-alist
'((us-ascii . nil)
(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)
(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'.")
+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)
(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
;;;
+(defun rfc2047-qp-or-base64 ()
+ "Return the type with which to encode the buffer.
+This is either `base64' or `quoted-printable'."
+ (save-excursion
+ (let ((limit (min (point-max) (+ 2000 (point-min))))
+ (n8bit 0))
+ (goto-char (point-min))
+ (skip-chars-forward "\x20-\x7f\r\n\t" limit)
+ (while (< (point) limit)
+ (incf n8bit)
+ (forward-char 1)
+ (skip-chars-forward "\x20-\x7f\r\n\t" limit))
+ (if (or (< (* 6 n8bit) (- limit (point-min)))
+ ;; Don't base64, say, a short line with a single
+ ;; non-ASCII char when splitting parts by charset.
+ (= n8bit 1))
+ 'quoted-printable
+ 'base64))))
+
(defun rfc2047-narrow-to-field ()
"Narrow the buffer to the header on the current line."
(beginning-of-line)
(progn
(forward-line 1)
(if (re-search-forward "^[^ \n\t]" nil t)
- (progn
- (beginning-of-line)
- (point))
+ (point-at-bol)
(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)))))
+
+(defvar rfc2047-encoding-type 'address-mime
+ "The type of encoding done by `rfc2047-encode-region'.
+This should be dynamically bound around calls to
+`rfc2047-encode-region' to either `mime' or `address-mime'. See
+`rfc2047-header-encoding-alist', for definitions.")
+
(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."
(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)
+ (mm-charset-to-coding-system
+ (car message-posting-charset))))
;; No encoding necessary, but folding is nice
(rfc2047-fold-region
(save-excursion
(eq (car elem) t))
(setq alist nil
method (cdr elem))))
+ (goto-char (point-min))
+ (re-search-forward "^[^:]+: *" nil t)
(cond
- ((stringp method)
- (rfc2047-encode-region (point-min) (point-max) method))
+ ((eq method 'address-mime)
+ (rfc2047-encode-region (point) (point-max)))
((eq method 'mime)
- (rfc2047-encode-region (point-min) (point-max)))
+ (let ((rfc2047-encoding-type 'mime))
+ (rfc2047-encode-region (point) (point-max))))
((eq method 'default)
(if (and (featurep 'mule)
(if (boundp 'default-enable-multibyte-characters)
default-enable-multibyte-characters)
mail-parse-charset)
- (mm-encode-coding-region (point-min) (point-max)
+ (mm-encode-coding-region (point) (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
+ ;; 8-bit names. The group name mail copy just got
;; 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.
+ ;; Modified by Dave Love, with the commented-out code changed
+ ;; in accordance with changes elsewhere.
((null method)
- (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"))))
+ (rfc2047-encode-region (point) (point-max)))
+;;; ((null method)
+;;; (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)
default-enable-multibyte-characters))
- (mm-encode-coding-region (point-min) (point-max) method)))
+ (mm-encode-coding-region (point) (point-max) method)))
;; Hm.
(t)))
(goto-char (point-max)))))))
The buffer may be narrowed."
(require 'message) ; for message-posting-charset
(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)
- (setq found t)))
- found))
-
-(defun rfc2047-dissect-region (b e &optional word-chars)
- "Dissect the region between B and E into words."
- (unless word-chars
- ;; Anything except most CTLs, WSP
- (setq word-chars "\010\012\014\041-\177"))
- (let (mail-parse-mule-charset
- words point current
- result word)
- (save-restriction
- (narrow-to-region b e)
- (goto-char (point-min))
- (skip-chars-forward "\000-\177")
- (while (not (eobp))
- (setq point (point))
- (skip-chars-backward word-chars b)
- (unless (eq b (point))
- (push (cons (buffer-substring b (point)) nil) words))
- (setq b (point))
- (goto-char point)
- (setq current (mm-charset-after))
- (forward-char 1)
- (skip-chars-forward word-chars)
- (while (and (not (eobp))
- (eq (mm-charset-after) current))
- (forward-char 1)
- (skip-chars-forward word-chars))
- (unless (eq b (point))
- (push (cons (buffer-substring b (point)) current) words))
- (setq b (point))
- (skip-chars-forward "\000-\177"))
- (unless (eq b (point))
- (push (cons (buffer-substring b (point)) nil) words)))
- ;; merge adjacent words
- (setq word (pop words))
- (while word
- (if (and (cdr word)
- (caar words)
- (not (cdar words))
- (not (string-match "[^ \t]" (caar words))))
- (if (eq (cdr (nth 1 words)) (cdr word))
- (progn
- (setq word (cons (concat
- (car (nth 1 words)) (caar words)
- (car word))
- (cdr word)))
- (pop words)
- (pop words))
- (push (cons (concat (caar words) (car word)) (cdr word))
- result)
- (pop words)
- (setq word (pop words)))
- (push word result)
- (setq word (pop words))))
- result))
-
-(defun rfc2047-encode-region (b e &optional word-chars)
- "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)
- (delete-region (point-min) (point-max))
- (while (setq word (pop words))
- (if (not (cdr word))
- (insert (car word))
- (rfc2047-fold-region (gnus-point-at-bol) (point))
- (goto-char (point-max))
- (if (> (- (point) (save-restriction
- (widen)
- (gnus-point-at-bol))) 76)
- (insert "\n "))
- ;; Insert blank between encoded words
- (if (eq (char-before) ?=) (insert " "))
- (rfc2047-encode (point)
- (progn (insert (car word)) (point))
- (cdr word))))
- (rfc2047-fold-region (point-min) (point-max)))))
-
-(defun rfc2047-encode-string (string &optional word-chars)
- "Encode words in STRING."
+ (mm-find-mime-charset-region (point-min) (point-max))))
+ (and charsets
+ (not (equal charsets (list (car message-posting-charset)))))))
+
+;; Use this syntax table when parsing into regions that may need
+;; encoding. Double quotes are string delimiters, backslash is
+;; character quoting, and all other RFC 2822 special characters are
+;; treated as punctuation so we can use forward-sexp/forward-word to
+;; skip to the end of regions appropriately. Nb. ietf-drums does
+;; things differently.
+(defconst rfc2047-syntax-table
+ ;; (make-char-table 'syntax-table '(2)) only works in Emacs.
+ (let ((table (make-syntax-table)))
+ ;; The following is done to work for setting all elements of the table
+ ;; in Emacs 21 and 22 and XEmacs; it appears to be the cleanest way.
+ ;; Play safe and don't assume the form of the word syntax entry --
+ ;; copy it from ?a.
+ (if (fboundp 'set-char-table-range) ; Emacs
+ (funcall (intern "set-char-table-range")
+ table t (aref (standard-syntax-table) ?a))
+ (if (fboundp 'put-char-table)
+ (if (fboundp 'get-char-table) ; warning avoidance
+ (put-char-table t (get-char-table ?a (standard-syntax-table))
+ table))))
+ (modify-syntax-entry ?\\ "\\" table)
+ (modify-syntax-entry ?\" "\"" table)
+ (modify-syntax-entry ?\( "." table)
+ (modify-syntax-entry ?\) "." table)
+ (modify-syntax-entry ?\< "." table)
+ (modify-syntax-entry ?\> "." table)
+ (modify-syntax-entry ?\[ "." table)
+ (modify-syntax-entry ?\] "." table)
+ (modify-syntax-entry ?: "." table)
+ (modify-syntax-entry ?\; "." table)
+ (modify-syntax-entry ?, "." table)
+ (modify-syntax-entry ?@ "." table)
+ table))
+
+(defun rfc2047-encode-region (b e)
+ "Encode words in region B to E that need encoding.
+By default, the region is treated as containing RFC2822 addresses.
+Dynamically bind `rfc2047-encoding-type' to change that."
+ (save-restriction
+ (narrow-to-region b e)
+ (if (eq 'mime rfc2047-encoding-type)
+ ;; 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")
+ (unless (eobp)
+ (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 ; end of current token
+ ;; Whether there's an encoded word before the current
+ ;; token, either immediately or separated by space.
+ last-encoded)
+ (goto-char (point-min))
+ (condition-case nil ; in case of unbalanced quotes
+ ;; Look for rfc2822-style: sequences of atoms, quoted
+ ;; strings, specials, whitespace. (Specials mustn't be
+ ;; encoded.)
+ (while (not (eobp))
+ (setq start (point))
+ ;; Skip whitespace.
+ (unless (= 0 (skip-chars-forward " \t\n"))
+ (setq start (point)))
+ (cond
+ ((not (char-after))) ; eob
+ ;; else token start
+ ((eq ?\" (char-syntax (char-after)))
+ ;; Quoted word.
+ (forward-sexp)
+ (setq end (point))
+ ;; Does it need encoding?
+ (goto-char start)
+ (skip-chars-forward "\000-\177" end)
+ (if (= end (point))
+ (setq last-encoded nil)
+ ;; It needs encoding. Strip the quotes first,
+ ;; since encoded words can't occur in quotes.
+ (goto-char end)
+ (delete-backward-char 1)
+ (goto-char start)
+ (delete-char 1)
+ (when last-encoded
+ ;; There was a preceding quoted word. We need
+ ;; to include any separating whitespace in this
+ ;; word to avoid it getting lost.
+ (skip-chars-backward " \t")
+ ;; A space is needed between the encoded words.
+ (insert ? )
+ (setq start (point)
+ end (1+ end)))
+ ;; Adjust the end position for the deleted quotes.
+ (rfc2047-encode start (- end 2))
+ (setq last-encoded t))) ; record that it was encoded
+ ((eq ?. (char-syntax (char-after)))
+ ;; Skip other delimiters, but record that they've
+ ;; potentially separated quoted words.
+ (forward-char)
+ (setq last-encoded nil))
+ (t ; normal token/whitespace sequence
+ ;; Find the end.
+ (forward-word 1)
+ (skip-chars-backward " \t")
+ (setq end (point))
+ ;; Deal with encoding and leading space as for
+ ;; quoted words.
+ (goto-char start)
+ (skip-chars-forward "\000-\177" end)
+ (if (= end (point))
+ (setq last-encoded nil)
+ (when last-encoded
+ (goto-char start)
+ (skip-chars-backward " \t")
+ (insert ? )
+ (setq start (point)
+ end (1+ end)))
+ (rfc2047-encode start end)
+ (setq last-encoded t)))))
+ (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-encoding-type')."
(with-temp-buffer
(insert string)
- (rfc2047-encode-region (point-min) (point-max) word-chars)
+ (rfc2047-encode-region (point-min) (point-max))
(buffer-string)))
-(defun rfc2047-encode (b e charset)
- "Encode the word in the region B to E with CHARSET."
- (let* ((mime-charset (mm-mime-charset charset))
- (cs (mm-charset-to-coding-system mime-charset))
+(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-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
+ ;; parts that can be encoded separately.
+ (error "Can't rfc2047-encode `%s'"
+ (buffer-substring b e))
+ (setq mime-charset (car mime-charset))
+ (mm-charset-to-coding-system mime-charset)))
+ ;; Fixme: Better, calculate the number of non-ASCII
+ ;; characters, at least for 8-bit charsets.
(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 (rfc2047-qp-or-base64) 'base64)
+ 'B
+ 'Q))))
(start (concat
"=?" (downcase (symbol-name mime-charset)) "?"
- (downcase (symbol-name encoding)) "?"))
+ (upcase (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)
+ (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
+ (narrow-to-region b e)
+ (when (eq encoding 'B)
+ ;; break into lines before encoding
+ (goto-char (point-min))
+ (while (not (eobp))
+ (if first
+ (progn
+ (goto-char (min (point-max) (+ length1 (point))))
+ (setq first nil))
+ (goto-char (min (point-max) (+ length (point)))))
+ (unless (eobp)
+ (insert ?\n)))
+ (setq first t))
+ (if (and (mm-multibyte-p)
+ (mm-coding-system-p cs))
+ (mm-encode-coding-region (point-min) (point-max) cs))
+ (funcall (cdr (assq encoding rfc2047-encoding-function-alist))
+ (point-min) (point-max))
+ (goto-char (point-min))
+ (while (not (eobp))
+ (unless first
+ (insert ? ))
+ (setq first nil)
+ (insert start)
+ (end-of-line)
+ (insert "?=")
+ (forward-line 1))))))
+
+(defun rfc2047-fold-field ()
+ "Fold the current header field."
+ (save-excursion
(save-restriction
- (narrow-to-region b e)
- (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"))))
- (if (and (mm-multibyte-p)
- (mm-coding-system-p cs))
- (mm-encode-coding-region (point-min) (point-max) cs))
- (funcall (cdr (assq encoding rfc2047-encoding-function-alist))
- (point-min) (point-max))
- (goto-char (point-min))
- (while (not (eobp))
- (unless first
- (insert " "))
- (setq first nil)
- (insert start)
- (end-of-line)
- (insert "?=")
- (forward-line 1)))))
+ (rfc2047-narrow-to-field)
+ (rfc2047-fold-region (point-min) (point-max)))))
(defun rfc2047-fold-region (b e)
"Fold long lines in region B to E."
(goto-char (point-min))
(let ((break nil)
(qword-break nil)
+ (first t)
(bol (save-restriction
(widen)
- (gnus-point-at-bol))))
+ (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]")
- (insert "\n")
+ (insert ?\n)
(insert "\n "))
(setq bol (1- (point)))
;; Don't break before the first non-LWSP characters.
(skip-chars-forward " \t")
- (unless (eobp) (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) ?=)
(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"))))
- (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]")
- (insert "\n")
+ (insert ?\n)
(insert "\n "))
(setq bol (1- (point)))
;; Don't break before the first non-LWSP characters.
(skip-chars-forward " \t")
- (unless (eobp) (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 region B to E."
(goto-char (point-min))
(let ((bol (save-restriction
(widen)
- (gnus-point-at-bol)))
- (eol (gnus-point-at-eol))
- leading)
+ (point-at-bol)))
+ (eol (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)))))
- (setq bol (gnus-point-at-bol)))
- (setq eol (gnus-point-at-eol))
+ (if (and (looking-at "[ \t]")
+ (< (- (point-at-eol) bol) 76))
+ (delete-region eol (progn
+ (goto-char eol)
+ (skip-chars-forward "\r\n")
+ (point)))
+ (setq bol (point-at-bol)))
+ (setq eol (point-at-eol))
(forward-line 1)))))
(defun rfc2047-b-encode-region (b e)
(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)
- (gnus-point-at-bol))))
- (while alist
- (when (looking-at (caar 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))
+ (point-at-bol))))
+ (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)
(goto-char (min (point-max) (+ 56 bol)))
(search-backward "=" (- (point) 2) t)
(unless (or (bobp) (eobp))
- (insert "\n")
+ (insert ?\n)
(setq bol (point)))))))))
;;;
;;; Functions for decoding RFC2047 messages
;;;
-(defvar rfc2047-encoded-word-regexp
- "=\\?\\([^][\000-\040()<>@,\;:\\\"/?.=]+\\)\\?\\(B\\|Q\\)\\?\\([!->@-~ +]*\\)\\?=")
+(eval-and-compile
+ (defconst rfc2047-encoded-word-regexp
+ "=\\?\\([^][\000-\040()<>@,\;:*\\\"/?.=]+\\)\\(?:\\*[^?]+\\)?\
+\\?\\(B\\|Q\\)\\?\\([!->@-~ ]*\\)\\?="))
+
+;; Fixme: This should decode in place, not cons intermediate strings.
+;; 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."
(goto-char (point-min))
;; Remove whitespace between encoded words.
(while (re-search-forward
- (concat "\\(" rfc2047-encoded-word-regexp "\\)"
- "\\(\n?[ \t]\\)+"
- "\\(" rfc2047-encoded-word-regexp "\\)")
+ (eval-when-compile
+ (concat "\\(" rfc2047-encoded-word-regexp "\\)"
+ "\\(\n?[ \t]\\)+"
+ "\\(" rfc2047-encoded-word-regexp "\\)"))
nil t)
(delete-region (goto-char (match-end 1)) (match-beginning 6)))
;; Decode the encoded words.
(prog1
(match-string 0)
(delete-region (match-beginning 0) (match-end 0)))))
+ ;; Remove newlines between decoded words, though such things
+ ;; essentially must not be 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 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
+ ;; Fixme: This logic is wrong, but seems to be required by
+ ;; Gnus summary buffer generation. The value of `m' depends
+ ;; on the current buffer, not global multibyteness or that
+ ;; of the string. Also the string returned should always be
+ ;; multibyte in a multibyte session, i.e. the buffer should
+ ;; be multibyte before `buffer-string' is called.
+ (when m
+ (mm-enable-multibyte))
+ (insert string)
+ (inline
+ (rfc2047-decode-region (point-min) (point-max)))
+ (buffer-string))
+ ;; Fixme: As above, `m' here is inappropriate.
+ (if (and m
+ mail-parse-charset
+ (not (eq mail-parse-charset 'us-ascii))
+ (not (eq mail-parse-charset 'gnus-decoded)))
+ ;; `decode-coding-string' in Emacs offers a third optional
+ ;; arg NOCOPY to avoid consing a new string if the decoding
+ ;; is "trivial". Unfortunately it currently doesn't
+ ;; consider anything else than a `nil' coding system
+ ;; trivial.
+ ;; `rfc2047-decode-string' is called multiple times for each
+ ;; article during summary buffer generation, and we really
+ ;; want to avoid unnecessary consing. So we bypass
+ ;; `decode-coding-string' if the string is purely ASCII.
+ (if (and (fboundp 'detect-coding-string)
+ ;; string is purely ASCII
+ (eq (detect-coding-string string t) 'undecided))
+ string
+ (mm-decode-coding-string string mail-parse-charset))
+ (mm-string-as-multibyte string)))))
(defun rfc2047-parse-and-decode (word)
"Decode WORD and return it if it is an encoded word.
-Return WORD if not."
+Return WORD if it is not not an encoded word or if the charset isn't
+decodable."
(if (not (string-match rfc2047-encoded-word-regexp word))
word
(or
(condition-case nil
(rfc2047-decode
(match-string 1 word)
- (upcase (match-string 2 word))
+ (string-to-char (match-string 2 word))
(match-string 3 word))
(error word))
- word)))
+ word))) ; un-decodable
(defun rfc2047-pad-base64 (string)
"Pad STRING to quartets."
;; Be more liberal to accept buggy base64 strings. If
;; base64-decode-string accepts buggy strings, this function could
;; be aliased to identity.
- (case (mod (length string) 4)
- (0 string)
- (1 string) ;; Error, don't pad it.
- (2 (concat string "=="))
- (3 (concat string "="))))
+ (if (= 0 (mod (length string) 4))
+ string
+ (when (string-match "=+$" string)
+ (setq string (substring string 0 (match-beginning 0))))
+ (case (mod (length string) 4)
+ (0 string)
+ (1 string) ;; Error, don't pad it.
+ (2 (concat string "=="))
+ (3 (concat string "=")))))
(defun rfc2047-decode (charset encoding string)
"Decode STRING from the given MIME CHARSET in the given ENCODING.
-Valid ENCODINGs are \"B\" and \"Q\".
+Valid ENCODINGs are the characters \"B\" and \"Q\".
If your Emacs implementation can't decode CHARSET, return nil."
(if (stringp charset)
(setq charset (intern (downcase charset))))
(when (and (eq cs 'ascii)
mail-parse-charset)
(setq cs mail-parse-charset))
- (mm-with-unibyte-current-buffer-mule4
- ;; 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
+ ((char-equal ?B encoding)
+ (base64-decode-string
+ (rfc2047-pad-base64 string)))
+ ((char-equal ?Q encoding)
+ (quoted-printable-decode-string
+ (mm-subst-char-in-string ?_ ? string t)))
+ (t (error "Invalid encoding: %c" encoding)))
+ cs))))
(provide 'rfc2047)
;;; rfc2047.el ends here
-
projects / gnus / blobdiff