Function: mm-qp-or-base64

mm-qp-or-base64 is a byte-compiled function defined in mm-encode.el.gz.

Signature

(mm-qp-or-base64)

Documentation

Return the type with which to encode the buffer.

This is either base64 or quoted-printable.

Source Code

;; Defined in /usr/src/emacs/lisp/gnus/mm-encode.el.gz
(defun mm-qp-or-base64 ()
  "Return the type with which to encode the buffer.
This is either `base64' or `quoted-printable'."
  (if (equal mm-use-ultra-safe-encoding '(sign . "pgp"))
      ;; perhaps not always accurate?
      '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)
	  (cl-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)))))