Importing Pterodactyl Gnus v0.97.

[elisp/gnus.git-] / lisp / mm-encode.el

diff --git a/lisp/mm-encode.el b/lisp/mm-encode.el
index 0846d92..cb30876 100644 (file)
--- a/lisp/mm-encode.el
+++ b/lisp/mm-encode.el
@@ -28,12 +28,15 @@
 (require 'mailcap)
 
 (defvar mm-content-transfer-encoding-defaults
-  '(("text/.*" quoted-printable)
-    ("message/rfc822" 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."
@@ -60,7 +63,7 @@
 (defun mm-encode-content-transfer-encoding (encoding &optional type)
   (cond
    ((eq encoding 'quoted-printable)
-    (quoted-printable-encode-region (point-min) (point-max)))
+    (quoted-printable-encode-region (point-min) (point-max) t))
    ((eq encoding 'base64)
     (when (equal type "text/plain")
       (goto-char (point-min))
@@ -87,7 +90,12 @@ The encoding used is returned."
         (encoding
          (or (and (listp type)
                   (cadr (assq 'encoding type)))
-             (mm-content-transfer-encoding mime-type))))
+             (mm-content-transfer-encoding mime-type)))
+        (bits (mm-body-7-or-8)))
+    ;; We force buffers that are 7bit to be unencoded, no matter
+    ;; what the preferred encoding is.
+    (when (eq bits '7bit)
+      (setq encoding bits))
     (mm-encode-content-transfer-encoding encoding mime-type)
     encoding))
 
@@ -105,14 +113,31 @@ The encoding used is returned."
   (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
+    (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 (< (* 6 n8bit) (- limit (point-min)))
+         'quoted-printable
+       'base64))))
+
 (provide 'mm-encode)
 
 ;;; mm-encode.el ends here