X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fmm-encode.el;h=5ea2d7dd1b680527c2173c86632397d4d22ed645;hb=ab6b58ba032f3baaf4c78e63be9e39e9d8de5e62;hp=38cd97aa9cc3562a3f38d3b6da2df9779857dce6;hpb=517d8c1e72ed898204ef80597cda8084746d52c3;p=elisp%2Fgnus.git- diff --git a/lisp/mm-encode.el b/lisp/mm-encode.el index 38cd97a..5ea2d7d 100644 --- a/lisp/mm-encode.el +++ b/lisp/mm-encode.el @@ -1,5 +1,7 @@ ;;; mm-encode.el --- Functions for encoding MIME things -;; Copyright (C) 1998 Free Software Foundation, Inc. + +;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, +;; 2005, 2006 Free Software Foundation, Inc. ;; Author: Lars Magne Ingebrigtsen ;; MORIOKA Tomohiko @@ -17,13 +19,192 @@ ;; 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. +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. ;;; Commentary: ;;; Code: +(eval-when-compile (require 'cl)) +(require 'mail-parse) +(require 'mailcap) +(eval-and-compile + (autoload 'mm-body-7-or-8 "mm-bodies") + (autoload 'mm-long-lines-p "mm-bodies")) + +(defcustom mm-content-transfer-encoding-defaults + '(("text/x-patch" 8bit) + ("text/.*" qp-or-base64) + ("message/rfc822" 8bit) + ("application/emacs-lisp" qp-or-base64) + ("application/x-emacs-lisp" qp-or-base64) + ("application/x-patch" qp-or-base64) + (".*" 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. + +`qp-or-base64' has another effect. It will fold long lines so that +MIME parts may not be broken by MTA. So do `quoted-printable' and +`base64'. + +Note: It affects body encoding only when a part is a raw forwarded +message (which will be made by `gnus-summary-mail-forward' with the +arg 2 for example) or is neither the text/* type nor the message/* +type. Even though in those cases, you can use the `encoding' MML tag +to specify encoding of non-ASCII MIME parts." + :type '(repeat (list (regexp :tag "MIME type") + (choice :tag "encoding" + (const 7bit) + (const 8bit) + (const qp-or-base64) + (const quoted-printable) + (const base64)))) + :group 'mime) + +(defvar mm-use-ultra-safe-encoding nil + "If non-nil, use encodings aimed at Procrustean bed survival. + +This means that textual parts are encoded as quoted-printable if they +contain lines longer than 76 characters or starting with \"From \" in +the body. Non-7bit encodings (8bit, binary) are generally disallowed. +This is to reduce the probability that a broken MTA or MDA changes the +message. + +This variable should never be set directly, but bound before a call to +`mml-generate-mime' or similar functions.") + +(defun mm-insert-rfc822-headers (charset encoding) + "Insert text/plain headers with CHARSET and ENCODING." + (insert "MIME-Version: 1.0\n") + (insert "Content-Type: text/plain; charset=" + (mail-quote-string (downcase (symbol-name charset))) "\n") + (insert "Content-Transfer-Encoding: " + (downcase (symbol-name encoding)) "\n")) + +(defun mm-insert-multipart-headers () + "Insert multipart/mixed headers." + (let ((boundary "=-=-=")) + (insert "MIME-Version: 1.0\n") + (insert "Content-Type: multipart/mixed; boundary=\"" boundary "\"\n") + boundary)) + +(defun mm-default-file-encoding (file) + "Return a default encoding for FILE." + (if (not (string-match "\\.[^.]+$" file)) + "application/octet-stream" + (mailcap-extension-to-mime (match-string 0 file)))) + +(defun mm-safer-encoding (encoding) + "Return an encoding similar to ENCODING but safer than it." + (cond + ((eq encoding '7bit) '7bit) ;; 7bit is considered safe. + ((memq encoding '(8bit quoted-printable)) 'quoted-printable) + ;; The remaining encodings are binary and base64 (and perhaps some + ;; non-standard ones), which are both turned into base64. + (t 'base64))) + +(defun mm-encode-content-transfer-encoding (encoding &optional type) + "Encode the current buffer with ENCODING for MIME type TYPE. +ENCODING can be: nil (do nothing); one of `quoted-printable', `base64'; +`7bit', `8bit' or `binary' (all do nothing); a function to do the encoding." + (cond + ((eq encoding 'quoted-printable) + ;; This used to try to make a multibyte buffer unibyte. That's + ;; completely wrong, since you'd get QP-encoded emacs-mule. If + ;; this gets run on multibyte text it's an error that needs + ;; fixing, and the encoding function will signal an error. + ;; Likewise base64 below. + (quoted-printable-encode-region (point-min) (point-max) t)) + ((eq encoding 'base64) + (when (string-match "\\`text/" type) + (goto-char (point-min)) + (while (search-forward "\n" nil t) + (replace-match "\r\n" t t))) + (base64-encode-region (point-min) (point-max))) + ((memq encoding '(7bit 8bit binary)) + ;; Do nothing. + ) + ((null encoding) + ;; Do nothing. + ) + ;; Fixme: Ignoring errors here looks bogus. + ((functionp encoding) + (ignore-errors (funcall encoding (point-min) (point-max)))) + (t + (error "Unknown encoding %s" encoding)))) + +(defun mm-encode-buffer (type) + "Encode the buffer which contains data of MIME type TYPE. +TYPE is a string or a list of the components. +The encoding used is returned." + (let* ((mime-type (if (stringp type) type (car type))) + (encoding + (or (and (listp type) + (cadr (assq 'encoding 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. + ;; Only if the buffers don't contain lone lines. + (when (and (eq bits '7bit) (not (mm-long-lines-p 76))) + (setq encoding bits)) + (mm-encode-content-transfer-encoding encoding mime-type) + encoding)) + +(defun mm-insert-headers (type encoding &optional file) + "Insert headers for TYPE." + (insert "Content-Type: " type) + (when file + (insert ";\n\tname=\"" (file-name-nondirectory file) "\"")) + (insert "\n") + (insert (format "Content-Transfer-Encoding: %s\n" encoding)) + (insert "Content-Disposition: inline") + (when file + (insert ";\n\tfilename=\"" (file-name-nondirectory file) "\"")) + (insert "\n") + (insert "\n")) + +(defun mm-content-transfer-encoding (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 + (let ((encoding + (if (eq (cadr (car rules)) 'qp-or-base64) + (mm-qp-or-base64) + (cadr (car rules))))) + (if mm-use-ultra-safe-encoding + (mm-safer-encoding encoding) + encoding)))) + (pop rules))))) + +(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) + (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))))) + (provide 'mm-encode) +;;; arch-tag: 7d01bba4-d469-4851-952b-dc863f84ed66 ;;; mm-encode.el ends here