Importing pgnus-0.6

[elisp/gnus.git-] / lisp / qp.el

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+;;; qp.el --- Quoted-printable functions
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(defvar quoted-printable-encoding-characters
+  (mapcar 'identity "0123456789ABCDEF"))
+
+(defun quoted-printable-decode-region (from to)
+  "Decode quoted-printable in the region between FROM and TO."
+  (interactive "r")
+  (save-excursion
+    (goto-char from)
+    (while (search-forward "=" to t)
+      (cond ((eq (following-char) ?\n)
+            (delete-char -1)
+            (delete-char 1))
+           ((and
+             (memq (following-char) quoted-printable-encoding-characters)
+             (memq (char-after (1+ (point)))
+                   quoted-printable-encoding-characters))
+            (subst-char-in-region
+             (1- (point)) (point) ?=
+             (string-to-number
+              (buffer-substring (point) (+ 2 (point)))
+              16))
+            (delete-char 2))
+           ((looking-at "=")
+            (delete-char 1))
+           ((message "Malformed MIME quoted-printable message"))))))
+
+(defun quoted-printable-decode-string (string)
+ "Decode the quoted-printable-encoded STRING and return the results."
+ (with-temp-buffer
+   (insert string)
+   (quoted-printable-decode-region (point-min) (point-max))
+   (buffer-string)))
+
+(defun quoted-printable-encode-region (from to)
+  "QP-encode the region between FROM and TO."
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (narrow-to-region from to)
+      (goto-char (point-min))
+      (while (re-search-forward "[\000-\007\013\015-\037\200-\237=]" nil t)
+       (insert
+        (prog1
+            (format "=%x" (char-after (1- (point))))
+          (delete-char -1))))
+      ;; Fold long lines.
+      (goto-char (point-min))
+      (end-of-line)
+      (while (> (current-column) 72)
+       (beginning-of-line)
+       (forward-char 72)
+       (search-backward "=" (- (point) 2) t)
+       (insert "=\n")
+       (end-of-line)))))
+
+(defun quoted-printable-encode-string (string)
+ "QP-encode STRING and return the results."
+ (with-temp-buffer
+   (insert string)
+   (quoted-printable-encode-region (point-min) (point-max))
+   (buffer-string)))
+
+(provide 'qp)
+
+;; qp.el ends here