(rmail-decode-quoted-printable): New function

mostly copied from gnus-art.el.
(rmail-hex-string-to-integer): New fn, copied from hexl.el.
(rmail-hex-char-to-integer): Likewise.
(rmail-convert-to-babyl-format): Use rmail-decode-quoted-printable.

1 files changed, 41 insertions, 4 deletions

diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 4ca92b13275..e9d6243a128 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -1478,10 +1478,7 @@ Optional DEFAULT is password to start with."
                  (setq count (1+ count))
                  (if quoted-printable-header-field-end
                      (save-excursion
-                       (save-restriction
-                         (narrow-to-region header-end (point))
-                         (require 'gnus-art)
-                         (article-mime-decode-quoted-printable-buffer))
+                       (rmail-decode-quoted-printable header-end (point))
                        ;; Change "quoted-printable" to "8bit",
                        ;; to reflect the decoding we just did.
                        (goto-char quoted-printable-header-field-end)
@@ -1508,6 +1505,46 @@ Optional DEFAULT is password to start with."
               (t (error "Cannot convert to babyl format")))))
     count))
 
+(defun rmail-hex-char-to-integer (character)
+  "Return CHARACTER's value interpreted as a hex digit."
+  (if (and (>= character ?0) (<= character ?9))
+      (- character ?0)
+    (let ((ch (logior character 32)))
+      (if (and (>= ch ?a) (<= ch ?f))
+          (- ch (- ?a 10))
+        (error "Invalid hex digit `%c'" ch)))))
+
+(defun rmail-hex-string-to-integer (hex-string)
+  "Return decimal integer for HEX-STRING."
+  (let ((hex-num 0)
+        (index 0))
+    (while (< index (length hex-string))
+      (setq hex-num (+ (* hex-num 16)
+                       (rmail-hex-char-to-integer (aref hex-string index))))
+      (setq index (1+ index)))
+    hex-num))
+
+(defun rmail-decode-quoted-printable (from to)
+  "Decode Quoted-Printable in the region between FROM and TO."
+  (interactive "r")
+  (goto-char from)
+  (or (markerp to)
+      (setq to (copy-marker to)))
+  (while (search-forward "=" to t)
+    (cond ((eq (following-char) ?\n)
+           (delete-char -1)
+           (delete-char 1))
+          ((looking-at "[0-9A-F][0-9A-F]")
+           (subst-char-in-region
+            (1- (point)) (point) ?=
+            (rmail-hex-string-to-integer
+             (buffer-substring (point) (+ 2 (point)))))
+           (delete-char 2))
+          ((looking-at "=")
+           (delete-char 1))
+          (t
+           (message "Malformed MIME quoted-printable message")))))
+
 ;; Delete the "From ..." line, creating various other headers with
 ;; information from it if they don't already exist.  Now puts the
 ;; original line into a mail-from: header line for debugging and for