X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fmm-view.el;h=4fba52b78eef87e827c030b63abd54999fd3a3c4;hb=refs%2Ftags%2Ft-gnus-6_15_24-00;hp=14ec63bff1b0827f7d3240d3cbc76a67650f041b;hpb=93fd3c5fd9f215515162b7016beb25d30d10104b;p=elisp%2Fgnus.git-

diff --git a/lisp/mm-view.el b/lisp/mm-view.el
index 14ec63b..4fba52b 100644
--- a/lisp/mm-view.el
+++ b/lisp/mm-view.el
@@ -1,5 +1,5 @@
-;;; mm-view.el --- Functions for viewing MIME objects
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;;; mm-view.el --- functions for viewing MIME objects
+;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; This file is part of GNU Emacs.
@@ -23,90 +23,363 @@
 
 ;;; Code:
 
+(eval-when-compile (require 'cl))
 (require 'mail-parse)
-(require 'mailcap)
+(require 'gnus-mailcap)
 (require 'mm-bodies)
+(require 'mm-decode)
+
+(eval-and-compile
+  (autoload 'gnus-article-prepare-display "gnus-art")
+  (autoload 'vcard-parse-string "vcard")
+  (autoload 'vcard-format-string "vcard")
+  (autoload 'fill-flowed "flow-fill")
+  (autoload 'html2text "html2text")
+  (unless (fboundp 'diff-mode)
+    (autoload 'diff-mode "diff-mode" "" t nil)))
+
+(defvar mm-text-html-renderer-alist
+  '((w3  . mm-inline-text-html-render-with-w3)
+    (w3m . mm-inline-text-html-render-with-w3m)
+    (w3m-standalone mm-inline-render-with-stdin nil
+		    "w3m" "-dump" "-T" "text/html")
+    (links mm-inline-render-with-file
+	   mm-links-remove-leading-blank
+	   "links" "-dump" file)
+    (lynx  mm-inline-render-with-stdin nil
+	   "lynx" "-dump" "-force_html" "-stdin" "-nolist")
+    (html2text  mm-inline-render-with-function html2text))
+  "The attributes of renderer types for text/html.")
+
+(defvar mm-text-html-washer-alist
+  '((w3  . gnus-article-wash-html-with-w3)
+    (w3m . gnus-article-wash-html-with-w3m)
+    (w3m-standalone mm-inline-render-with-stdin nil
+		    "w3m" "-dump" "-T" "text/html")
+    (links mm-inline-wash-with-file
+	   mm-links-remove-leading-blank
+	   "links" "-dump" file)
+    (lynx  mm-inline-wash-with-stdin nil
+	   "lynx" "-dump" "-force_html" "-stdin" "-nolist")
+    (html2text  html2text))
+  "The attributes of washer types for text/html.")
+
+;;; Internal variables.
 
 ;;;
 ;;; Functions for displaying various formats inline
 ;;;
 
-(defun mm-inline-image (handle)
-  (let ((type (cadr (split-string (car (mm-handle-type handle)) "/")))
-	buffer-read-only image)
-    (mm-with-unibyte-buffer
-      (insert-buffer-substring (mm-handle-buffer handle))
-      (mm-decode-content-transfer-encoding
-       (mm-handle-encoding handle)
-       (car (mm-handle-type handle)))
-      (setq image (make-image-specifier
-		   (vector (intern type) :data (buffer-string)))))
-    (let ((annot (make-annotation image nil 'text)))
-      (set-extent-property annot 'mm t)
-      (set-extent-property annot 'duplicable t)
-      (mm-handle-set-undisplayer handle annot))
-    (insert " ")))
+(defun mm-inline-image-emacs (handle)
+  (let ((b (point-marker))
+	buffer-read-only)
+    (put-image (mm-get-image handle) b)
+    (insert "\n\n")
+    (mm-handle-set-undisplayer
+     handle
+     `(lambda ()
+	(let ((b ,b)
+	      buffer-read-only)
+	  (remove-images b b)
+	  (delete-region b (+ b 2)))))))
 
-(defun mm-inline-text (handle)
-  (let ((type (cadr (split-string (car (mm-handle-type handle)) "/")))
-	text buffer-read-only)
+(defun mm-inline-image-xemacs (handle)
+  (insert "\n\n")
+  (forward-char -2)
+  (let ((annot (make-annotation (mm-get-image handle) nil 'text))
+	buffer-read-only)
+    (mm-handle-set-undisplayer
+     handle
+     `(lambda ()
+	(let ((b ,(point-marker))
+	      buffer-read-only)
+	  (delete-annotation ,annot)
+	  (delete-region (- b 2) b))))
+    (set-extent-property annot 'mm t)
+    (set-extent-property annot 'duplicable t)))
+
+(eval-and-compile
+  (if (featurep 'xemacs)
+      (defalias 'mm-inline-image 'mm-inline-image-xemacs)
+    (defalias 'mm-inline-image 'mm-inline-image-emacs)))
+
+(defvar mm-w3-setup nil)
+(defun mm-setup-w3 ()
+  (unless mm-w3-setup
+    (require 'w3)
+    (w3-do-setup)
+    (require 'url)
+    (require 'w3-vars)
+    (require 'url-vars)
+    (setq mm-w3-setup t)))
+
+(defun mm-inline-text-html-render-with-w3 (handle)
+  (mm-setup-w3)
+  (let ((text (mm-get-part handle))
+	(b (point))
+	(url-standalone-mode t)
+	(url-gateway-unplugged t)
+	(w3-honor-stylesheets nil)
+	(url-current-object
+	 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
+	(width (window-width))
+	(charset (mail-content-type-get
+		  (mm-handle-type handle) 'charset)))
+    (save-excursion
+      (insert text)
+      (save-restriction
+	(narrow-to-region b (point))
+	(goto-char (point-min))
+	(if (or (and (boundp 'w3-meta-content-type-charset-regexp)
+		     (re-search-forward
+		      w3-meta-content-type-charset-regexp nil t))
+		(and (boundp 'w3-meta-charset-content-type-regexp)
+		     (re-search-forward
+		      w3-meta-charset-content-type-regexp nil t)))
+	    (setq charset
+		  (or (let ((bsubstr (buffer-substring-no-properties
+				      (match-beginning 2)
+				      (match-end 2))))
+			(if (fboundp 'w3-coding-system-for-mime-charset)
+			    (w3-coding-system-for-mime-charset bsubstr)
+			  (mm-charset-to-coding-system bsubstr)))
+		      charset)))
+	(delete-region (point-min) (point-max))
+	(insert (mm-decode-string text charset))
+	(save-window-excursion
+	  (save-restriction
+	    (let ((w3-strict-width width)
+		  ;; Don't let w3 set the global version of
+		  ;; this variable.
+		  (fill-column fill-column))
+	      (if (or debug-on-error debug-on-quit)
+		  (w3-region (point-min) (point-max))
+		(condition-case ()
+		    (w3-region (point-min) (point-max))
+		  (error
+		   (delete-region (point-min) (point-max))
+		   (let ((b (point))
+			 (charset (mail-content-type-get
+				   (mm-handle-type handle) 'charset)))
+		     (if (or (eq charset 'gnus-decoded)
+			     (eq mail-parse-charset 'gnus-decoded))
+		       (save-restriction
+			 (narrow-to-region (point) (point))
+			 (mm-insert-part handle)
+			 (goto-char (point-max)))
+		       (insert (mm-decode-string (mm-get-part handle)
+						 charset))))
+		   (message
+		    "Error while rendering html; showing as text/plain")))))))
+	(mm-handle-set-undisplayer
+	 handle
+	 `(lambda ()
+	    (let (buffer-read-only)
+	      (if (functionp 'remove-specifier)
+		  (mapcar (lambda (prop)
+			    (remove-specifier
+			     (face-property 'default prop)
+			     (current-buffer)))
+			  '(background background-pixmap foreground)))
+	      (delete-region ,(point-min-marker)
+			     ,(point-max-marker)))))))))
+
+(defvar mm-w3m-setup nil
+  "Whether gnus-article-mode has been setup to use emacs-w3m.")
+
+(defun mm-setup-w3m ()
+  "Setup gnus-article-mode to use emacs-w3m."
+  (unless mm-w3m-setup
+    (require 'w3m)
+    (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
+      (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
+	    w3m-cid-retrieve-function-alist))
+    (setq mm-w3m-setup t))
+  (setq w3m-display-inline-images mm-inline-text-html-with-images))
+
+(defun mm-w3m-cid-retrieve (url &rest args)
+  "Insert a content pointed by URL if it has the cid: scheme."
+  (when (string-match "\\`cid:" url)
+    (setq url (concat "<" (substring url (match-end 0)) ">"))
+    (catch 'found-handle
+      (dolist (handle (with-current-buffer w3m-current-buffer
+			gnus-article-mime-handles))
+	(when (and (listp handle)
+		   (equal url (mm-handle-id handle)))
+	  (mm-insert-part handle)
+	  (throw 'found-handle (mm-handle-media-type handle)))))))
+
+(eval-and-compile
+  (unless (or (featurep 'xemacs)
+	      (>= emacs-major-version 21))
+    (defvar mm-w3m-mode-map nil
+      "Keymap for text/html part rendered by `mm-w3m-preview-text/html'.
+This map is overwritten by `mm-w3m-local-map-property' based on the
+value of `w3m-minor-mode-map'.  Therefore, in order to add some
+commands to this map, add them to `w3m-minor-mode-map' instead of this
+map.")))
+
+(defun mm-w3m-local-map-property ()
+  (when (and (boundp 'w3m-minor-mode-map) w3m-minor-mode-map)
+    (if (or (featurep 'xemacs)
+	    (>= emacs-major-version 21))
+	(list 'keymap w3m-minor-mode-map)
+      (list 'local-map
+	    (or mm-w3m-mode-map
+		(progn
+		  (setq mm-w3m-mode-map (copy-keymap w3m-minor-mode-map))
+		  (set-keymap-parent mm-w3m-mode-map gnus-article-mode-map)
+		  mm-w3m-mode-map))))))
+
+(defun mm-inline-text-html-render-with-w3m (handle)
+  "Render a text/html part using emacs-w3m."
+  (mm-setup-w3m)
+  (let ((text (mm-get-part handle))
+	(b (point))
+	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
+    (save-excursion
+      (insert text)
+      (save-restriction
+	(narrow-to-region b (point))
+	(goto-char (point-min))
+	(when (re-search-forward w3m-meta-content-type-charset-regexp nil t)
+	  (setq charset (or (w3m-charset-to-coding-system (match-string 2))
+			    charset)))
+	(when charset
+	  (delete-region (point-min) (point-max))
+	  (insert (mm-decode-string text charset)))
+	(let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
+	      w3m-force-redisplay)
+	  (w3m-region (point-min) (point-max)))
+	(when mm-inline-text-html-with-w3m-keymap
+	  (add-text-properties
+	   (point-min) (point-max)
+	   (nconc (mm-w3m-local-map-property)
+		  '(mm-inline-text-html-with-w3m t)))))
+      (mm-handle-set-undisplayer
+       handle
+       `(lambda ()
+	  (let (buffer-read-only)
+	    (if (functionp 'remove-specifier)
+		(mapcar (lambda (prop)
+			  (remove-specifier
+			   (face-property 'default prop)
+			   (current-buffer)))
+			'(background background-pixmap foreground)))
+	    (delete-region ,(point-min-marker)
+			   ,(point-max-marker))))))))
+
+(defun mm-links-remove-leading-blank ()
+  ;; Delete the annoying three spaces preceding each line of links
+  ;; output.
+  (goto-char (point-min))
+  (while (re-search-forward "^   " nil t)
+    (delete-region (match-beginning 0) (match-end 0))))
+
+(defun mm-inline-wash-with-file (post-func cmd &rest args)
+  (let ((file (mm-make-temp-file
+	       (expand-file-name "mm" mm-tmp-directory))))
+    (let ((coding-system-for-write 'binary))
+      (write-region (point-min) (point-max) file nil 'silent))
+    (delete-region (point-min) (point-max))
+    (unwind-protect
+	(apply 'call-process cmd nil t nil (mapcar 'eval args))
+      (delete-file file))
+    (and post-func (funcall post-func))))
+
+(defun mm-inline-wash-with-stdin (post-func cmd &rest args)
+  (let ((coding-system-for-write 'binary))
+    (apply 'call-process-region (point-min) (point-max)
+	   cmd t t nil args))
+  (and post-func (funcall post-func)))
+
+(defun mm-inline-render-with-file (handle post-func cmd &rest args)
+  (let ((source (mm-get-part handle)))
+    (mm-insert-inline
+     handle
+     (mm-with-unibyte-buffer
+       (insert source)
+       (apply 'mm-inline-wash-with-file post-func cmd args)
+       (buffer-string)))))
+
+(defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
+  (let ((source (mm-get-part handle)))
+    (mm-insert-inline
+     handle
+     (mm-with-unibyte-buffer
+       (insert source)
+       (apply 'mm-inline-wash-with-stdin post-func cmd args)
+       (buffer-string)))))
+
+(defun mm-inline-render-with-function (handle func &rest args)
+  (let ((source (mm-get-part handle)))
+    (mm-insert-inline
+     handle
+     (mm-with-unibyte-buffer
+       (insert source)
+       (apply func args)
+       (buffer-string)))))
+
+(defun mm-inline-text-html (handle)
+  (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
+	 (entry (assq func mm-text-html-renderer-alist))
+	 buffer-read-only)
+    (if entry
+	(setq func (cdr entry)))
     (cond
-     ((equal type "plain")
-      (with-temp-buffer
-	(insert-buffer-substring (mm-handle-buffer handle))
-	(mm-decode-content-transfer-encoding
-	 (mm-handle-encoding handle)
-	 (car (mm-handle-type handle)))
-	(setq text (buffer-string)))
-      (let ((b (point)))
-	(insert text)
-	(save-restriction
-	  (narrow-to-region b (point))
-	  (let ((charset (mail-content-type-get
-			  (mm-handle-type handle) 'charset)))
-	    (when charset
-	      (mm-decode-body charset nil)))
-	  (mm-handle-set-undisplayer
-	   handle
-	   `(lambda ()
-	      (let (buffer-read-only)
-		(delete-region
-		 ,(set-marker (make-marker) (point-min))
-		 ,(set-marker (make-marker) (point-max)))))))))
-     ((equal type "html")
-      (save-excursion
-	(w3-do-setup)
-	(mm-with-unibyte-buffer
-	  (insert-buffer-substring (mm-handle-buffer handle))
-	  (mm-decode-content-transfer-encoding
-	   (mm-handle-encoding handle)
-	   (car (mm-handle-type handle)))
-	  (require 'url)
-	  (save-window-excursion
-	    (w3-region (point-min) (point-max))
-	    (setq text (buffer-string))))
-	(mm-insert-inline handle text)))
-     ((or (equal type "enriched")
-	  (equal type "richtext"))
-      (save-excursion
-	(mm-with-unibyte-buffer
-	  (insert-buffer-substring (mm-handle-buffer handle))
-	  (mm-decode-content-transfer-encoding
-	   (mm-handle-encoding handle)
-	   (car (mm-handle-type handle)))
-	  (save-window-excursion
-	    (enriched-decode (point-min) (point-max))
-	    (setq text (buffer-string)))))
-      (mm-insert-inline handle text))
+     ((functionp func)
+      (funcall func handle))
      (t
-      (save-excursion
-	(mm-with-unibyte-buffer
-	  (insert-buffer-substring (mm-handle-buffer handle))
-	  (mm-decode-content-transfer-encoding
-	   (mm-handle-encoding handle)
-	   (car (mm-handle-type handle)))
-	  (setq text (buffer-string))))
-      (mm-insert-inline handle text)))))
+      (apply (car func) handle (cdr func))))))
+
+(defun mm-inline-text-vcard (handle)
+  (let (buffer-read-only)
+    (mm-insert-inline
+     handle
+     (concat "\n-- \n"
+	     (ignore-errors
+	       (if (fboundp 'vcard-pretty-print)
+		   (vcard-pretty-print (mm-get-part handle))
+		 (vcard-format-string
+		  (vcard-parse-string (mm-get-part handle)
+				      'vcard-standard-filter))))))))
+
+(defun mm-inline-text (handle)
+  (let ((b (point))
+	(type (mm-handle-media-subtype handle))
+	(charset (mail-content-type-get
+		  (mm-handle-type handle) 'charset))
+	buffer-read-only)
+    (if (or (eq charset 'gnus-decoded)
+	    ;; This is probably not entirely correct, but
+	    ;; makes rfc822 parts with embedded multiparts work.
+	    (eq mail-parse-charset 'gnus-decoded))
+	(save-restriction
+	  (narrow-to-region (point) (point))
+	  (mm-insert-part handle)
+	  (goto-char (point-max)))
+      (insert (mm-decode-string (mm-get-part handle) charset)))
+    (when (and (equal type "plain")
+	       (equal (cdr (assoc 'format (mm-handle-type handle)))
+		      "flowed"))
+      (save-restriction
+	(narrow-to-region b (point))
+	(goto-char b)
+	(fill-flowed)
+	(goto-char (point-max))))
+    (save-restriction
+      (narrow-to-region b (point))
+      (set-text-properties (point-min) (point-max) nil)
+      (when (or (equal type "enriched")
+		(equal type "richtext"))
+	(ignore-errors
+	  (enriched-decode (point-min) (point-max))))
+      (mm-handle-set-undisplayer
+       handle
+       `(lambda ()
+	  (let (buffer-read-only)
+	    (delete-region ,(point-min-marker)
+			   ,(point-max-marker))))))))
 
 (defun mm-insert-inline (handle text)
   "Insert TEXT inline from HANDLE."
@@ -118,7 +391,7 @@
 	(let (buffer-read-only)
 	  (delete-region ,(set-marker (make-marker) b)
 			 ,(set-marker (make-marker) (point))))))))
-  
+
 (defun mm-inline-audio (handle)
   (message "Not implemented"))
 
@@ -127,8 +400,186 @@
 
 (defun mm-w3-prepare-buffer ()
   (require 'w3)
-  (w3-prepare-buffer))
+  (let ((url-standalone-mode t)
+	(url-gateway-unplugged t)
+	(w3-honor-stylesheets nil))
+    (w3-prepare-buffer)))
+
+(defun mm-view-message ()
+  (mm-enable-multibyte)
+  (let (handles)
+    (let (gnus-article-mime-handles)
+      ;; Double decode problem may happen.  See mm-inline-message.
+      (run-hooks 'gnus-article-decode-hook)
+      (gnus-article-prepare-display)
+      (setq handles gnus-article-mime-handles))
+    (when handles
+      (setq gnus-article-mime-handles
+	    (mm-merge-handles gnus-article-mime-handles handles))))
+  (fundamental-mode)
+  (goto-char (point-min)))
+
+(defun mm-inline-message (handle)
+  (let ((b (point))
+	(bolp (bolp))
+	(charset (mail-content-type-get
+		  (mm-handle-type handle) 'charset))
+	gnus-displaying-mime handles)
+    (when (and charset
+	       (stringp charset))
+      (setq charset (intern (downcase charset)))
+      (when (eq charset 'us-ascii)
+	(setq charset nil)))
+    (save-excursion
+      (save-restriction
+	(narrow-to-region b b)
+	(mm-insert-part handle)
+	(let (gnus-article-mime-handles
+	      ;; disable prepare hook
+	      gnus-article-prepare-hook
+	      (gnus-newsgroup-charset
+	       (or charset gnus-newsgroup-charset)))
+	  (run-hooks 'gnus-article-decode-hook)
+	  (gnus-article-prepare-display)
+	  (setq handles gnus-article-mime-handles))
+	(goto-char (point-min))
+	(unless bolp
+	  (insert "\n"))
+	(goto-char (point-max))
+	(unless (bolp)
+	  (insert "\n"))
+	(insert "----------\n\n")
+	(when handles
+	  (setq gnus-article-mime-handles
+		(mm-merge-handles gnus-article-mime-handles handles)))
+	(mm-handle-set-undisplayer
+	 handle
+	 `(lambda ()
+	    (let (buffer-read-only)
+	      (if (fboundp 'remove-specifier)
+		  ;; This is only valid on XEmacs.
+		  (mapcar (lambda (prop)
+			    (remove-specifier
+			     (face-property 'default prop) (current-buffer)))
+			  '(background background-pixmap foreground)))
+	      (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
+
+(defun mm-display-inline-fontify (handle mode)
+  (let (text)
+    ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
+    ;; on for buffers whose name begins with " ".  That's why we use
+    ;; save-current-buffer/get-buffer-create rather than
+    ;; with-temp-buffer.
+    (save-current-buffer
+      (set-buffer (generate-new-buffer "*fontification*"))
+      (unwind-protect
+	  (progn
+	    (buffer-disable-undo)
+	    (mm-insert-part handle)
+	    (funcall mode)
+	    (require 'font-lock)
+	    (let ((font-lock-verbose nil))
+	      ;; I find font-lock a bit too verbose.
+	      (font-lock-fontify-buffer))
+	    ;; By default, XEmacs font-lock uses non-duplicable text
+	    ;; properties.  This code forces all the text properties
+	    ;; to be copied along with the text.
+	    (when (fboundp 'extent-list)
+	      (map-extents (lambda (ext ignored)
+			     (set-extent-property ext 'duplicable t)
+			     nil)
+			   nil nil nil nil nil 'text-prop))
+	    (setq text (buffer-string)))
+	(kill-buffer (current-buffer))))
+    (mm-insert-inline handle text)))
+
+;; Shouldn't these functions check whether the user even wants to use
+;; font-lock?  At least under XEmacs, this fontification is pretty
+;; much unconditional.  Also, it would be nice to change for the size
+;; of the fontified region.
+
+(defun mm-display-patch-inline (handle)
+  (mm-display-inline-fontify handle 'diff-mode))
+
+(defun mm-display-elisp-inline (handle)
+  (mm-display-inline-fontify handle 'emacs-lisp-mode))
+
+;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
+;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
+(defvar mm-pkcs7-signed-magic
+  (mm-string-as-unibyte
+   (apply 'concat
+	  (mapcar 'char-to-string
+		  (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
+			?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
+			?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
+			?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
+
+;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
+;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
+(defvar mm-pkcs7-enveloped-magic
+  (mm-string-as-unibyte
+   (apply 'concat
+	  (mapcar 'char-to-string
+		  (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
+			?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
+			?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
+			?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
+
+(defun mm-view-pkcs7-get-type (handle)
+  (mm-with-unibyte-buffer
+   (mm-insert-part handle)
+   (cond ((looking-at mm-pkcs7-enveloped-magic)
+	  'enveloped)
+	 ((looking-at mm-pkcs7-signed-magic)
+	  'signed)
+	 (t
+	  (error "Could not identify PKCS#7 type")))))
+
+(defun mm-view-pkcs7 (handle)
+  (case (mm-view-pkcs7-get-type handle)
+    (enveloped (mm-view-pkcs7-decrypt handle))
+    (signed (mm-view-pkcs7-verify handle))
+    (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
+
+(defun mm-view-pkcs7-verify (handle)
+  ;; A bogus implementation of PKCS#7. FIXME::
+  (mm-insert-part handle)
+  (goto-char (point-min))
+  (if (search-forward "Content-Type: " nil t)
+      (delete-region (point-min) (match-beginning 0)))
+  (goto-char (point-max))
+  (if (re-search-backward "--\r?\n?" nil t)
+      (delete-region (match-end 0) (point-max)))
+  (goto-char (point-min))
+  (while (search-forward "\r\n" nil t)
+    (replace-match "\n"))
+  (message "Verify signed PKCS#7 message is unimplemented.")
+  (sit-for 1)
+  t)
+
+(autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)
+
+(defun mm-view-pkcs7-decrypt (handle)
+  (insert-buffer-substring (mm-handle-buffer handle))
+  (goto-char (point-min))
+  (insert "MIME-Version: 1.0\n")
+  (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
+  (smime-decrypt-region
+   (point-min) (point-max)
+   (if (= (length smime-keys) 1)
+       (cadar smime-keys)
+     (smime-get-key-by-email
+      (gnus-completing-read-maybe-default
+       (concat "Decipher using which key? "
+	       (if smime-keys (concat "(default " (caar smime-keys) ") ")
+		 ""))
+       smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
+  (goto-char (point-min))
+  (while (search-forward "\r\n" nil t)
+    (replace-match "\n"))
+  (goto-char (point-min)))
 
 (provide 'mm-view)
 
-;; mm-view.el ends here
+;;; mm-view.el ends here