;;; mm-bodies.el --- Functions for decoding MIME things
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;; Copyright (C) 1998,99 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;; Code:
+(eval-and-compile
+ (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-8bit-char-regexp "[^\x20-\x7f\r\n\t\x7\x8\xb\xc\x1f]")
(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-mule-charset-to-mime-charset (car charsets)))
- start)
- (when (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))))))
+ (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
+ (delq 'ascii (mm-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)))
+ 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 (char-after)) 'ascii)
+ (when start
+ (save-restriction
+ (narrow-to-region start (point))
+ (mm-encode-coding-region start (point) mime-charset)
+ (goto-char (point-max)))
+ (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 (null (delq 'ascii (find-charset-region (point-min) (point-max))))
- '7bit
- '8bit))
+ (cond
+ ((not (featurep 'mule))
+ (if (save-excursion
+ (goto-char (point-min))
+ (re-search-forward mm-8bit-char-regexp nil t))
+ '8bit
+ '7bit))
+ (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 "\0-\177")
+ (eobp)))
+ '7bit
+ '8bit))))
;;;
;;; Functions for decoding
;;;
-(defun mm-decode-body (charset)
+(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) (point-max)))
+ ((memq encoding '(7bit 8bit binary))
+ )
+ ((null encoding)
+ )
+ ((eq encoding 'x-uuencode)
+ (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-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 mail-parse-charset))
(save-excursion
- (mm-decode-coding-region (point-min) (point-max) charset)))
+ (when 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
+ ;Article buffer is nil coding system
+ ;in XEmacs
+ enable-multibyte-characters
+ (or (not (eq mule-charset 'ascii))
+ (setq mule-charset mail-parse-charset)))
+ (mm-decode-coding-region (point-min) (point-max) mule-charset))))))
+
+(defun mm-decode-string (string charset)
+ "Decode STRING with CHARSET."
+ (setq charset (or charset mail-parse-charset))
+ (or
+ (when (featurep 'mule)
+ (let (mule-charset)
+ (when (and charset
+ (setq mule-charset (mm-charset-to-coding-system charset))
+ enable-multibyte-characters
+ (or (not (eq mule-charset 'ascii))
+ (setq mule-charset mail-parse-charset)))
+ (mm-decode-coding-string string mule-charset))))
+ string))
(provide 'mm-bodies)
projects / gnus / blobdiff