mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-21 10:24:55 +00:00
307 lines
10 KiB
EmacsLisp
307 lines
10 KiB
EmacsLisp
;;; mm-bodies.el --- Functions for decoding MIME things
|
|
|
|
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
|
|
;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
|
|
|
|
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
|
|
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
|
|
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;;; Code:
|
|
|
|
;; For Emacs < 22.2.
|
|
(eval-and-compile
|
|
(unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
|
|
|
|
(require 'mm-util)
|
|
(require 'rfc2047)
|
|
(require 'mm-encode)
|
|
|
|
(defvar mm-uu-yenc-decode-function)
|
|
(defvar mm-uu-decode-function)
|
|
(defvar mm-uu-binhex-decode-function)
|
|
|
|
;; 8bit treatment gets any char except: 0x32 - 0x7f, LF, TAB, BEL,
|
|
;; BS, vertical TAB, form feed, and ^_
|
|
;;
|
|
;; Note that CR is *not* included, as that would allow a non-paired CR
|
|
;; in the body contrary to RFC 2822:
|
|
;;
|
|
;; - CR and LF MUST only occur together as CRLF; they MUST NOT
|
|
;; appear independently in the body.
|
|
|
|
(defvar mm-7bit-chars "\x20-\x7f\n\t\x7\x8\xb\xc\x1f")
|
|
|
|
(defcustom mm-body-charset-encoding-alist
|
|
'((iso-2022-jp . 7bit)
|
|
(iso-2022-jp-2 . 7bit)
|
|
;; We MUST encode UTF-16 because it can contain \0's which is
|
|
;; known to break servers.
|
|
;; Note: UTF-16 variants are invalid for text parts [RFC 2781],
|
|
;; so this can't happen :-/.
|
|
;; PPS: Yes, it can happen if the user specifies UTF-16 in the MML
|
|
;; markup. - jh.
|
|
(utf-16 . base64)
|
|
(utf-16be . base64)
|
|
(utf-16le . base64))
|
|
"Alist of MIME charsets to encodings.
|
|
Valid encodings are `7bit', `8bit', `quoted-printable' and `base64'."
|
|
:type '(repeat (cons (symbol :tag "charset")
|
|
(choice :tag "encoding"
|
|
(const 7bit)
|
|
(const 8bit)
|
|
(const quoted-printable)
|
|
(const base64))))
|
|
:group 'mime)
|
|
|
|
(autoload 'message-options-get "message")
|
|
(declare-function message-options-set "message" (symbol value))
|
|
|
|
(defun mm-encode-body (&optional charset)
|
|
"Encode a body.
|
|
Should be called narrowed to the body that is to be encoded.
|
|
If there is more than one non-ASCII MULE charset in the body, then the
|
|
list of MULE charsets found is returned.
|
|
If CHARSET is non-nil, it is used as the MIME charset to encode the body.
|
|
If successful, the MIME charset is returned.
|
|
If no encoding was done, nil is returned."
|
|
(if (not (mm-multibyte-p))
|
|
;; In the non-Mule case, we search for non-ASCII chars and
|
|
;; return the value of `mail-parse-charset' if any are found.
|
|
(or charset
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(if (re-search-forward "[^\x0-\x7f]" nil t)
|
|
(or mail-parse-charset
|
|
(message-options-get 'mm-encody-body-charset)
|
|
(message-options-set
|
|
'mm-encody-body-charset
|
|
(mm-read-coding-system "Charset used in the article: ")))
|
|
;; The logic in `mml-generate-mime-1' confirms that it's OK
|
|
;; to return nil here.
|
|
nil)))
|
|
(save-excursion
|
|
(if charset
|
|
(progn
|
|
(mm-encode-coding-region (point-min) (point-max)
|
|
(mm-charset-to-coding-system charset))
|
|
charset)
|
|
(goto-char (point-min))
|
|
(let ((charsets (mm-find-mime-charset-region (point-min) (point-max)
|
|
mm-hack-charsets)))
|
|
(cond
|
|
;; No encoding.
|
|
((null charsets)
|
|
nil)
|
|
;; Too many charsets.
|
|
((> (length charsets) 1)
|
|
charsets)
|
|
;; We encode.
|
|
(t
|
|
(prog1
|
|
(setq charset (car charsets))
|
|
(mm-encode-coding-region (point-min) (point-max)
|
|
(mm-charset-to-coding-system charset))))
|
|
))))))
|
|
|
|
(defun mm-long-lines-p (length)
|
|
"Say whether any of the lines in the buffer is longer than LENGTH."
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(end-of-line)
|
|
(while (and (not (eobp))
|
|
(not (> (current-column) length)))
|
|
(forward-line 1)
|
|
(end-of-line))
|
|
(and (> (current-column) length)
|
|
(current-column))))
|
|
|
|
(defvar message-posting-charset)
|
|
|
|
(defun mm-body-encoding (charset &optional encoding)
|
|
"Do Content-Transfer-Encoding and return the encoding of the current buffer."
|
|
(when (stringp encoding)
|
|
(setq encoding (intern (downcase encoding))))
|
|
(let ((bits (mm-body-7-or-8))
|
|
(longp (mm-long-lines-p 1000)))
|
|
(require 'message)
|
|
(cond
|
|
((and (not longp)
|
|
(not (and mm-use-ultra-safe-encoding
|
|
(or (save-excursion (re-search-forward " $" nil t))
|
|
(save-excursion (re-search-forward "^From " nil t)))))
|
|
(eq bits '7bit))
|
|
bits)
|
|
((and (not mm-use-ultra-safe-encoding)
|
|
(not longp)
|
|
(not (cdr (assq charset mm-body-charset-encoding-alist)))
|
|
(or (eq t (cdr message-posting-charset))
|
|
(memq charset (cdr message-posting-charset))
|
|
(eq charset mail-parse-charset)))
|
|
bits)
|
|
(t
|
|
(let ((encoding (or encoding
|
|
(cdr (assq charset mm-body-charset-encoding-alist))
|
|
(mm-qp-or-base64))))
|
|
(when mm-use-ultra-safe-encoding
|
|
(setq encoding (mm-safer-encoding encoding)))
|
|
(mm-encode-content-transfer-encoding encoding "text/plain")
|
|
encoding)))))
|
|
|
|
(defun mm-body-7-or-8 ()
|
|
"Say whether the body is 7bit or 8bit."
|
|
(if (save-excursion
|
|
(goto-char (point-min))
|
|
(skip-chars-forward mm-7bit-chars)
|
|
(eobp))
|
|
'7bit
|
|
'8bit))
|
|
|
|
;;;
|
|
;;; Functions for decoding
|
|
;;;
|
|
|
|
(defun mm-decode-content-transfer-encoding (encoding &optional type)
|
|
"Decodes buffer encoded with ENCODING, returning success status.
|
|
If TYPE is `text/plain' CRLF->LF translation may occur."
|
|
(prog1
|
|
(condition-case error
|
|
(cond
|
|
((eq encoding 'quoted-printable)
|
|
(quoted-printable-decode-region (point-min) (point-max))
|
|
t)
|
|
((eq encoding 'base64)
|
|
(base64-decode-region
|
|
(point-min)
|
|
;; Some mailers insert whitespace
|
|
;; junk at the end which
|
|
;; base64-decode-region dislikes.
|
|
;; Also remove possible junk which could
|
|
;; have been added by mailing list software.
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(while (re-search-forward "^[\t ]*\r?\n" nil t)
|
|
(delete-region (match-beginning 0) (match-end 0)))
|
|
(goto-char (point-max))
|
|
(when (re-search-backward "^[A-Za-z0-9+/]+=*[\t ]*$" nil t)
|
|
(forward-line))
|
|
(point))))
|
|
((memq encoding '(nil 7bit 8bit binary))
|
|
;; Do nothing.
|
|
t)
|
|
((memq encoding '(x-uuencode x-uue))
|
|
(require 'mm-uu)
|
|
(funcall mm-uu-decode-function (point-min) (point-max))
|
|
t)
|
|
((eq encoding 'x-binhex)
|
|
(require 'mm-uu)
|
|
(funcall mm-uu-binhex-decode-function (point-min) (point-max))
|
|
t)
|
|
((eq encoding 'x-yenc)
|
|
(require 'mm-uu)
|
|
(funcall mm-uu-yenc-decode-function (point-min) (point-max))
|
|
)
|
|
((functionp encoding)
|
|
(funcall encoding (point-min) (point-max))
|
|
t)
|
|
(t
|
|
(message "Unknown encoding %s; defaulting to 8bit" encoding)))
|
|
(error
|
|
(message "Error while decoding: %s" error)
|
|
nil))
|
|
(when (and
|
|
type
|
|
(memq encoding '(base64 x-uuencode x-uue x-binhex x-yenc))
|
|
(string-match "\\`text/" type))
|
|
(goto-char (point-min))
|
|
(while (search-forward "\r\n" nil t)
|
|
(replace-match "\n" t t)))))
|
|
|
|
(defun mm-decode-body (charset &optional encoding type)
|
|
"Decode the current article that has been encoded with ENCODING to CHARSET.
|
|
ENCODING is a MIME content transfer encoding.
|
|
CHARSET is the MIME charset with which to decode the data after transfer
|
|
decoding. If it is nil, default to `mail-parse-charset'."
|
|
(when (stringp charset)
|
|
(setq charset (intern (downcase charset))))
|
|
(when (or (not charset)
|
|
(eq 'gnus-all mail-parse-ignored-charsets)
|
|
(memq 'gnus-all mail-parse-ignored-charsets)
|
|
(memq charset mail-parse-ignored-charsets))
|
|
(setq charset mail-parse-charset))
|
|
(save-excursion
|
|
(when encoding
|
|
(mm-decode-content-transfer-encoding encoding type))
|
|
(when (and (featurep 'mule) ;; Fixme: Wrong test for unibyte session.
|
|
(not (eq charset 'gnus-decoded)))
|
|
(let ((coding-system (mm-charset-to-coding-system
|
|
;; Allow overwrite using
|
|
;; `mm-charset-override-alist'.
|
|
charset nil t)))
|
|
(if (and (not coding-system)
|
|
(listp mail-parse-ignored-charsets)
|
|
(memq 'gnus-unknown mail-parse-ignored-charsets))
|
|
(setq coding-system
|
|
(mm-charset-to-coding-system mail-parse-charset)))
|
|
(when (and charset coding-system
|
|
;; buffer-file-coding-system
|
|
;;Article buffer is nil coding system
|
|
;;in XEmacs
|
|
(mm-multibyte-p)
|
|
(or (not (eq coding-system 'ascii))
|
|
(setq coding-system mail-parse-charset)))
|
|
(mm-decode-coding-region (point-min) (point-max)
|
|
coding-system))
|
|
(setq buffer-file-coding-system
|
|
(if (boundp 'last-coding-system-used)
|
|
(symbol-value 'last-coding-system-used)
|
|
coding-system))))))
|
|
|
|
(defun mm-decode-string (string charset)
|
|
"Decode STRING with CHARSET."
|
|
(when (stringp charset)
|
|
(setq charset (intern (downcase charset))))
|
|
(when (or (not charset)
|
|
(eq 'gnus-all mail-parse-ignored-charsets)
|
|
(memq 'gnus-all mail-parse-ignored-charsets)
|
|
(memq charset mail-parse-ignored-charsets))
|
|
(setq charset mail-parse-charset))
|
|
(or
|
|
(when (featurep 'mule)
|
|
(let ((coding-system (mm-charset-to-coding-system
|
|
charset
|
|
;; Allow overwrite using
|
|
;; `mm-charset-override-alist'.
|
|
nil t)))
|
|
(if (and (not coding-system)
|
|
(listp mail-parse-ignored-charsets)
|
|
(memq 'gnus-unknown mail-parse-ignored-charsets))
|
|
(setq coding-system
|
|
(mm-charset-to-coding-system mail-parse-charset)))
|
|
(when (and charset coding-system
|
|
(mm-multibyte-p)
|
|
(or (not (eq coding-system 'ascii))
|
|
(setq coding-system mail-parse-charset)))
|
|
(mm-decode-coding-string string coding-system))))
|
|
string))
|
|
|
|
(provide 'mm-bodies)
|
|
|
|
;; arch-tag: 41104bb6-4443-4ca9-8d5c-ff87ecf27d8d
|
|
;;; mm-bodies.el ends here
|