;;; mm-bodies.el --- Functions for decoding MIME things
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;; Code:
(eval-and-compile
- (if (not (fboundp 'base64-encode-string))
- (require 'base64)))
+ (or (fboundp 'base64-decode-region)
+ (require 'base64))
+ (autoload 'binhex-decode-region "binhex"))
+
(require 'mm-util)
+(require 'rfc2047)
(require 'qp)
+(require 'uudecode)
+
+;; 8bit treatment gets any char except: 0x32 - 0x7f, CR, LF, TAB, BEL,
+;; BS, vertical TAB, form feed, and ^_
+(defvar mm-7bit-chars "\x20-\x7f\r\n\t\x7\x8\xb\xc\x1f")
+
+(defcustom mm-body-charset-encoding-alist
+ '((iso-2022-jp . 7bit)
+ (iso-2022-jp-2 . 7bit))
+ "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)
(defun mm-encode-body ()
"Encode a body.
MULE charsets are returned.
If successful, the MIME charset is returned.
If no encoding was done, nil is returned."
- (save-excursion
- (goto-char (point-min))
- (let ((charsets
- (delq 'ascii (find-charset-region (point-min) (point-max))))
- charset)
- (cond
- ;; No encoding.
- ((null charsets)
- nil)
- ;; Too many charsets.
- ((> (length charsets) 1)
- charsets)
- ;; We encode.
- (t
- (let ((mime-charset
- (mm-mime-charset (car charsets) (point-min) (point-max)))
- start)
- (when (or t
- ;; We always decode.
- (not (mm-coding-system-equal
- mime-charset buffer-file-coding-system)))
- (while (not (eobp))
- (if (eq (char-charset (following-char)) 'ascii)
- (when start
- (mm-encode-coding-region start (point) mime-charset)
- (setq start nil))
- (unless start
- (setq start (point))))
- (forward-char 1))
- (when start
- (mm-encode-coding-region start (point) mime-charset)
- (setq start nil)))
- mime-charset))))))
-
-(defun mm-body-encoding ()
- "Return the encoding of the current buffer."
- (if (and
- (null (delq 'ascii (find-charset-region (point-min) (point-max))))
- ;;;!!!The following is necessary because the function
- ;;;!!!above seems to return the wrong result under Emacs 20.3.
- ;;;!!!Sometimes.
- (save-excursion
- (goto-char (point-min))
- (skip-chars-forward "\0-\177")
- (eobp)))
- '7bit
- '8bit))
+ (if (not (featurep 'mule))
+ ;; In the non-Mule case, we search for non-ASCII chars and
+ ;; return the value of `mm-default-charset' if any are found.
+ (save-excursion
+ (goto-char (point-min))
+ (if (re-search-forward "[^\x0-\x7f]" nil t)
+ (or mail-parse-charset
+ (mm-read-charset "Charset used in the article: "))
+ ;; The logic in `mml-generate-mime-1' confirms that it's OK
+ ;; to return nil here.
+ nil))
+ (save-excursion
+ (goto-char (point-min))
+ (let ((charsets (mm-find-mime-charset-region (point-min) (point-max)))
+ charset)
+ (cond
+ ;; No encoding.
+ ((null charsets)
+ nil)
+ ;; Too many charsets.
+ ((> (length charsets) 1)
+ charsets)
+ ;; We encode.
+ (t
+ (let ((charset (car charsets))
+ start)
+ (when (or t
+ ;; We always decode.
+ (not (mm-coding-system-equal
+ charset buffer-file-coding-system)))
+ (while (not (eobp))
+ (if (eq (mm-charset-after) 'ascii)
+ (when start
+ (save-restriction
+ (narrow-to-region start (point))
+ (mm-encode-coding-region start (point) charset)
+ (goto-char (point-max)))
+ (setq start nil))
+ (unless start
+ (setq start (point))))
+ (forward-char 1))
+ (when start
+ (mm-encode-coding-region start (point) charset)
+ (setq start nil)))
+ charset)))))))
+
+(defun mm-body-encoding (charset &optional encoding)
+ "Do Content-Transfer-Encoding and return the encoding of the current buffer."
+ (let ((bits (mm-body-7-or-8)))
+ (cond
+ ((eq bits '7bit)
+ bits)
+ ((and (not mm-use-ultra-safe-encoding)
+ (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."
+ (cond
+ ((not (featurep 'mule))
+ (if (save-excursion
+ (goto-char (point-min))
+ (skip-chars-forward mm-7bit-chars)
+ (eobp))
+ '7bit
+ '8bit))
+ (t
+ ;; Mule version
+ (if (and (null (delq 'ascii
+ (mm-find-charset-region (point-min) (point-max))))
+ ;;!!!The following is necessary because the function
+ ;;!!!above seems to return the wrong result under
+ ;;!!!Emacs 20.3. Sometimes.
+ (save-excursion
+ (goto-char (point-min))
+ (skip-chars-forward mm-7bit-chars)
+ (eobp)))
+ '7bit
+ '8bit))))
;;;
;;; Functions for decoding
;;;
-(defun mm-decode-body (charset encoding)
+(defun mm-decode-content-transfer-encoding (encoding &optional type)
+ (prog1
+ (condition-case error
+ (cond
+ ((eq encoding 'quoted-printable)
+ (quoted-printable-decode-region (point-min) (point-max)))
+ ((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))
+ (if (re-search-forward "^[\t ]*$" nil t)
+ (delete-region (point) (point-max))
+ (goto-char (point-max)))
+ (skip-chars-backward "\n\t ")
+ (delete-region (point) (point-max))
+ (point))))
+ ((memq encoding '(7bit 8bit binary))
+ ;; Do nothing.
+ )
+ ((null encoding)
+ ;; Do nothing.
+ )
+ ((memq encoding '(x-uuencode x-uue))
+ (funcall mm-uu-decode-function (point-min) (point-max)))
+ ((eq encoding 'x-binhex)
+ (funcall mm-uu-binhex-decode-function (point-min) (point-max)))
+ ((functionp encoding)
+ (funcall encoding (point-min) (point-max)))
+ (t
+ (message "Unknown encoding %s; defaulting to 8bit" encoding)))
+ (error
+ (message "Error while decoding: %s" error)
+ nil))
+ (when (and
+ (memq encoding '(base64 x-uuencode x-uue x-binhex))
+ (equal type "text/plain"))
+ (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.
The characters in CHARSET should then be decoded."
- (setq charset (or charset rfc2047-default-charset))
+ (if (stringp charset)
+ (setq charset (intern (downcase charset))))
+ (if (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
- (cond
- ((eq encoding 'quoted-printable)
- (quoted-printable-decode-region (point-min) (point-max)))
- ((eq encoding 'base64)
- (condition-case ()
- (base64-decode-region (point-min) (point-max))
- (error nil)))
- ((memq encoding '(7bit 8bit binary))
- )
- ((null encoding)
- )
- (t
- (error "Can't decode encoding %s" encoding))))
+ (mm-decode-content-transfer-encoding encoding type))
(when (featurep 'mule)
- (let (mule-charset)
- (when (and charset
- (setq mule-charset (mm-charset-to-coding-system charset))
- buffer-file-coding-system
- ;;(not (mm-coding-system-equal
- ;; buffer-file-coding-system mule-charset))
- )
+ (let ((mule-charset (mm-charset-to-coding-system charset)))
+ (if (and (not mule-charset)
+ (listp mail-parse-ignored-charsets)
+ (memq 'gnus-unknown mail-parse-ignored-charsets))
+ (setq mule-charset
+ (mm-charset-to-coding-system mail-parse-charset)))
+ (when (and charset mule-charset
+ ;; buffer-file-coding-system
+ ;;Article buffer is nil coding system
+ ;;in XEmacs
+ (mm-multibyte-p)
+ (or (not (eq mule-charset 'ascii))
+ (setq mule-charset mail-parse-charset))
+ (not (eq mule-charset 'gnus-decoded)))
(mm-decode-coding-region (point-min) (point-max) mule-charset))))))
+(defun mm-decode-string (string charset)
+ "Decode STRING with CHARSET."
+ (if (stringp charset)
+ (setq charset (intern (downcase charset))))
+ (if (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 ((mule-charset (mm-charset-to-coding-system charset)))
+ (if (and (not mule-charset)
+ (listp mail-parse-ignored-charsets)
+ (memq 'gnus-unknown mail-parse-ignored-charsets))
+ (setq mule-charset
+ (mm-charset-to-coding-system mail-parse-charset)))
+ (when (and charset mule-charset
+ (mm-multibyte-p)
+ (or (not (eq mule-charset 'ascii))
+ (setq mule-charset mail-parse-charset)))
+ (mm-decode-coding-string string mule-charset))))
+ string))
+
(provide 'mm-bodies)
;; mm-bodies.el ends here
projects / gnus / blobdiff