(require 'mailcap)
(defvar mm-content-transfer-encoding-defaults
- '(("text/.*" quoted-printable)
+ '(("text/x-patch" 8bit)
+ ("text/.*" qp-or-base64)
("message/rfc822" 8bit)
("application/emacs-lisp" 8bit)
("application/x-patch" 8bit)
- (".*" base64))
- "Alist of regexps that match MIME types and their encodings.")
+ (".*" qp-or-base64))
+ "Alist of regexps that match MIME types and their encodings.
+If the encoding is `qp-or-base64', then either quoted-printable
+or base64 will be used, depending on what is more efficient.")
(defun mm-insert-rfc822-headers (charset encoding)
"Insert text/plain headers with CHARSET and ENCODING."
(insert "\n"))
(defun mm-content-transfer-encoding (type)
- "Return a CTE suitable for TYPE."
+ "Return a CTE suitable for TYPE to encode the current buffer."
(let ((rules mm-content-transfer-encoding-defaults))
(catch 'found
(while rules
(when (string-match (caar rules) type)
- (throw 'found (cadar rules)))
+ (throw 'found
+ (if (eq (cadar rules) 'qp-or-base64)
+ (mm-qp-or-base64)
+ (cadar rules))))
(pop rules)))))
+(defun mm-qp-or-base64 ()
+ (save-excursion
+ (save-restriction
+ (narrow-to-region (point-min) (min (+ (point-min) 1000) (point-max)))
+ (goto-char (point-min))
+ (let ((8bit 0))
+ (cond
+ ((not (featurep 'mule))
+ (while (re-search-forward "[^\x00-\x7f]" nil t)
+ (incf 8bit)))
+ (t
+ ;; Mule version
+ (while (not (eobp))
+ (skip-chars-forward "\0-\177")
+ (unless (eobp)
+ (forward-char 1)
+ (incf 8bit)))))
+ (if (> (/ (* 8bit 1.0) (buffer-size)) 0.166)
+ 'quoted-printable
+ 'base64)))))
+
(provide 'mm-encode)
;;; mm-encode.el ends here