X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fmm-encode.el;h=cb17414999334df97ed0948864bbcda18e0a8770;hb=04ba5250e9e47ebe40860a0902d4ef6405ca143f;hp=cb30876a95cf9c0ffe341a501e1f1a7ec972ee18;hpb=c8b25eebe2bfccd8b707d8c9e8ffa0d88d4a20af;p=elisp%2Fgnus.git- diff --git a/lisp/mm-encode.el b/lisp/mm-encode.el index cb30876..cb17414 100644 --- a/lisp/mm-encode.el +++ b/lisp/mm-encode.el @@ -1,5 +1,6 @@ ;;; mm-encode.el --- Functions for encoding MIME things -;; Copyright (C) 1998,99 Free Software Foundation, Inc. +;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 +;; Free Software Foundation, Inc. ;; Author: Lars Magne Ingebrigtsen ;; MORIOKA Tomohiko @@ -24,19 +25,44 @@ ;;; Code: +(eval-when-compile (require 'cl)) (require 'mail-parse) -(require 'mailcap) +(require 'gnus-mailcap) +(eval-and-compile + (autoload 'mm-body-7-or-8 "mm-bodies") + (autoload 'mm-long-lines-p "mm-bodies")) -(defvar mm-content-transfer-encoding-defaults +(defcustom mm-content-transfer-encoding-defaults '(("text/x-patch" 8bit) ("text/.*" qp-or-base64) ("message/rfc822" 8bit) ("application/emacs-lisp" 8bit) + ("application/x-emacs-lisp" 8bit) ("application/x-patch" 8bit) - (".*" 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.") +or base64 will be used, depending on what is more efficient." + :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." @@ -50,8 +76,7 @@ or base64 will be used, depending on what is more efficient.") "Insert multipart/mixed headers." (let ((boundary "=-=-=")) (insert "MIME-Version: 1.0\n") - (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n" - boundary)) + (insert "Content-Type: multipart/mixed; boundary=\"" boundary "\"\n") boundary)) (defun mm-default-file-encoding (file) @@ -60,31 +85,47 @@ or base64 will be used, depending on what is more efficient.") "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 + ((memq encoding '(7bit 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 (equal type "text/plain") (goto-char (point-min)) (while (search-forward "\n" nil t) (replace-match "\r\n" t t))) - (condition-case error - (base64-encode-region (point-min) (point-max)) - (error - (message "Error while decoding: %s" error) - nil))) + (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 - (message "Unknown encoding %s; defaulting to 8bit" encoding)))) + (error "Unknown encoding %s" encoding)))) (defun mm-encode-buffer (type) - "Encode the buffer which contains data of 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 @@ -94,7 +135,8 @@ The encoding used is returned." (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) + ;; 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)) @@ -119,24 +161,36 @@ The encoding used is returned." (while rules (when (string-match (caar rules) type) (throw 'found - (if (eq (cadar rules) 'qp-or-base64) - (mm-qp-or-base64) - (cadar rules)))) + (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 () - (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)))) + "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)