Rename `mime-view-buffer' -> `mime-preview-buffer'.
[elisp/semi.git] / mime-view.el
index 52fc682..bf363dc 100644 (file)
@@ -1,15 +1,14 @@
 ;;; mime-view.el --- interactive MIME viewer for GNU Emacs
 
-;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
+;; Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
 
 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
 ;; Created: 1994/7/13
 ;;     Renamed: 1994/8/31 from tm-body.el
 ;;     Renamed: 1997/02/19 from tm-view.el
-;; Version: $Revision: 0.50 $
 ;; Keywords: MIME, multimedia, mail, news
 
-;; This file is part of SEMI (SEMI is Emacs MIME Interfaces).
+;; This file is part of SEMI (Sophisticated Emacs MIME Interfaces).
 
 ;; This program is free software; you can redistribute it and/or
 ;; modify it under the terms of the GNU General Public License as
@@ -28,7 +27,6 @@
 
 ;;; Code:
 
-(require 'cl)
 (require 'std11)
 (require 'mel)
 (require 'eword-decode)
 ;;; @ version
 ;;;
 
-(defconst mime-view-RCS-ID
-  "$Id: mime-view.el,v 0.50 1997-03-17 15:01:11 morioka Exp $")
-
-(defconst mime-view-version (get-version-string mime-view-RCS-ID))
+(defconst mime-view-version-string
+  `,(concat "SEMI MIME-View "
+           (mapconcat #'number-to-string (cdr semi-version) ".")
+           " (" (car semi-version) ")"))
 
 
 ;;; @ variables
 ;;;
 
-(defvar mime/content-decoding-condition
-  '(((type . "text/plain")
-     (method "tm-plain" nil 'file 'type 'encoding 'mode 'name)
+(defvar mime-acting-condition
+  '(((type . text)(subtype . plain)
+     (method "tm-plain" nil 'file "" 'encoding 'mode 'name)
      (mode "play" "print")
      )
-    ((type . "text/html")
-     (method "tm-html" nil 'file 'type 'encoding 'mode 'name)
+    ((type . text)(subtype . html)
+     (method "tm-html" nil 'file "" 'encoding 'mode 'name)
      (mode . "play")
      )
-    ((type . "text/x-rot13-47")
-     (method . mime-article/decode-caesar)
+    ((type . text)(subtype . x-rot13-47)
+     (method . mime-method-to-display-caesar)
      (mode . "play")
      )
-    ((type . "audio/basic")
-     (method "tm-au"    nil 'file 'type 'encoding 'mode 'name)
+    ((type . text)(subtype . x-rot13-47-48)
+     (method . mime-method-to-display-caesar)
      (mode . "play")
      )
-    
-    ((type . "image/jpeg")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
-     )
-    ((type . "image/gif")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
-     )
-    ((type . "image/tiff")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
-     )
-    ((type . "image/x-tiff")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
-     )
-    ((type . "image/x-xbm")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
-     )
-    ((type . "image/x-pic")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
+
+    ((type . audio)(subtype . basic)
+     (method "tm-au"    nil 'file "" 'encoding 'mode 'name)
+     (mode . "play")
      )
-    ((type . "image/x-mag")
-     (method "tm-image" nil 'file 'type 'encoding 'mode 'name)
+    
+    ((type . image)
+     (method "tm-image" nil 'file "" 'encoding 'mode 'name)
      (mode "play" "print")
      )
     
-    ((type . "video/mpeg")
-     (method "tm-mpeg"  nil 'file 'type 'encoding 'mode 'name)
+    ((type . video)(subtype . mpeg)
+     (method "tm-mpeg"  nil 'file "" 'encoding 'mode 'name)
      (mode . "play")
      )
     
-    ((type . "application/postscript")
-     (method "tm-ps" nil 'file 'type 'encoding 'mode 'name)
+    ((type . application)(subtype . postscript)
+     (method "tm-ps" nil 'file "" 'encoding 'mode 'name)
      (mode "play" "print")
      )
-    ((type . "application/octet-stream")
-     (method "tm-file"  nil 'file 'type 'encoding 'mode 'name)
-     (mode "play" "print")
+    ((type . application)(subtype . octet-stream)
+     (method . mime-method-to-save)(mode "play" "print")
      )
-    
-    ;;((type . "message/external-body")
-    ;; (method "xterm" nil
-    ;;        "-e" "showexternal"
-    ;;         'file '"access-type" '"name" '"site" '"directory"))
-    ((type . "message/rfc822")
-     (method . mime-article/view-message/rfc822)
-     (mode . "play")
+
+    ((type . message)(subtype . external-body)
+     ("access-type" . "anon-ftp")
+     (method . mime-method-to-display-message/external-ftp)
      )
-    ((type . "message/partial")
-     (method . mime-article/decode-message/partial)
+    ((type . message)(subtype . rfc822)
+     (method . mime-method-to-display-message/rfc822)
      (mode . "play")
      )
-    ((type . "message/external-body")
-     ("access-type" . "anon-ftp")
-     (method . mime-article/decode-message/external-ftp)
+    ((type . message)(subtype . partial)
+     (method . mime-method-to-store-message/partial)
+     (mode . "play")
      )
     
     ((method "metamail" t "-m" "tm" "-x" "-d" "-z" "-e" 'file)
      (mode . "play")
      )
-    ((method "tm-file"  nil 'file 'type 'encoding 'mode 'name)
-     (mode . "extract")
-     )
+    ((method . mime-method-to-save)(mode . "extract"))
     ))
 
 (defvar mime-view-childrens-header-showing-Content-Type-list
@@ -185,121 +157,101 @@ Each elements are regexp of field-name.")
     ))
 
 
-;;; @@ predicate functions
-;;;
-
-(defun mime-view-header-visible-p (rcnum cinfo)
-  "Return non-nil if header of current entity is visible."
-  (or (null rcnum)
-      (member (mime::content-info/type
-              (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo))
-             mime-view-childrens-header-showing-Content-Type-list)
-      ))
-
-(defun mime-view-body-visible-p (rcnum cinfo &optional ctype)
-  (let (ccinfo)
-    (or ctype
-       (setq ctype
-             (mime::content-info/type
-              (setq ccinfo (mime-article/rcnum-to-cinfo rcnum cinfo))
-              ))
-       )
-    (and (member ctype mime-view-visible-media-type-list)
-        (if (string-equal ctype "application/octet-stream")
-            (progn
-              (or ccinfo
-                  (setq ccinfo (mime-article/rcnum-to-cinfo rcnum cinfo))
-                  )
-              (member (mime::content-info/encoding ccinfo)
-                      '(nil "7bit" "8bit"))
-              )
-          t))
-    ))
-
-
 ;;; @@ entity button
 ;;;
 
-(defun mime-view-insert-entity-button (rcnum cinfo ctype params subj encoding)
+(defun mime-view-insert-entity-button (rcnum cinfo
+                                            media-type media-subtype params
+                                            subj encoding)
   "Insert entity-button."
-  (save-restriction
-    (narrow-to-region (point)(point))
-    (let ((access-type (assoc "access-type" params))
-         (num (or (cdr (assoc "x-part-number" params))
-                  (if (consp rcnum)
-                      (mapconcat (function
-                                  (lambda (num)
-                                    (format "%s" (1+ num))
-                                    ))
-                                 (reverse rcnum) ".")
-                    "0"))
-              ))
-      (cond (access-type
-            (let ((server (assoc "server" params)))
-              (setq access-type (cdr access-type))
-              (if server
-                  (insert (format "[%s %s ([%s] %s)]\n" num subj
-                                  access-type (cdr server)))
-                (let ((site (cdr (assoc "site" params)))
-                      (dir (cdr (assoc "directory" params)))
-                      )
-                  (insert (format "[%s %s ([%s] %s:%s)]\n" num subj
-                                  access-type site dir))
-                  )))
-            )
-           (t
-            (let ((charset (cdr (assoc "charset" params))))
-              (insert (concat "[" num " " subj))
+  (mime-insert-button
+   (let ((access-type (assoc "access-type" params))
+        (num (or (cdr (assoc "x-part-number" params))
+                 (if (consp rcnum)
+                     (mapconcat (function
+                                 (lambda (num)
+                                   (format "%s" (1+ num))
+                                   ))
+                                (reverse rcnum) ".")
+                   "0"))
+             ))
+     (cond (access-type
+           (let ((server (assoc "server" params)))
+             (setq access-type (cdr access-type))
+             (if server
+                 (format "%s %s ([%s] %s)"
+                         num subj access-type (cdr server))
+               (let ((site (cdr (assoc "site" params)))
+                     (dir (cdr (assoc "directory" params)))
+                     )
+                 (format "%s %s ([%s] %s:%s)"
+                         num subj access-type site dir)
+                 )))
+           )
+          (t
+           (let ((charset (cdr (assoc "charset" params))))
+             (concat
+              num " " subj
               (let ((rest
-                     (concat " <" ctype
+                     (format " <%s/%s%s%s>"
+                             media-type media-subtype
                              (if charset
                                  (concat "; " charset)
-                               (if encoding (concat " (" encoding ")"))
-                               )
-                             ">]\n")))
+                               "")
+                             (if encoding
+                                 (concat " (" encoding ")")
+                               ""))))
                 (if (>= (+ (current-column)(length rest))(window-width))
-                    (insert "\n\t")
-                  )
-                (insert rest)
-                ))))
-      )
-    (mime-add-button (point-min)(1- (point-max))
-                    (function mime-view-play-current-entity))
-    ))
+                    "\n\t")
+                rest)))
+           )))
+   (function mime-preview-play-current-entity))
+  )
 
-(defun mime-view-entity-button-function
-  (rcnum cinfo ctype params subj encoding)
+(defun mime-view-entity-button-function (rcnum cinfo
+                                              media-type media-subtype
+                                              params subj encoding)
   "Insert entity button conditionally.
 Please redefine this function if you want to change default setting."
   (or (null rcnum)
-      (string= ctype "application/x-selection")
-      (and (string= ctype "application/octet-stream")
-          (string= (mime::content-info/type
-                    (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo))
-                   "multipart/encrypted"))
-      (mime-view-insert-entity-button rcnum cinfo ctype params subj encoding)
+      (and (eq media-type 'application)
+          (or (eq media-subtype 'x-selection)
+              (and (eq media-subtype 'octet-stream)
+                   (let ((entity-info
+                          (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo)))
+                     (and (eq (mime-entity-info-media-type entity-info)
+                              'multipart)
+                          (eq (mime-entity-info-media-subtype entity-info)
+                              'encrypted)
+                          )))))
+      (mime-view-insert-entity-button
+       rcnum cinfo media-type media-subtype params subj encoding)
       ))
 
 
 ;;; @@ content header filter
 ;;;
 
-(defsubst mime-view-cut-header ()
+(defun mime-view-cut-header ()
   (goto-char (point-min))
   (while (re-search-forward mime-view-ignored-field-regexp nil t)
     (let* ((beg (match-beginning 0))
           (end (match-end 0))
           (name (buffer-substring beg end))
           )
-      (or (member-if (function
-                     (lambda (regexp)
-                       (string-match regexp name)
-                       )) mime-view-visible-field-list)
-         (delete-region beg
+      (catch 'visible
+       (let ((rest mime-view-visible-field-list))
+         (while rest
+           (if (string-match (car rest) name)
+               (throw 'visible nil)
+             )
+           (setq rest (cdr rest))))
+       (delete-region beg
+                      (save-excursion
                         (if (re-search-forward "^\\([^ \t]\\|$\\)" nil t)
                             (match-beginning 0)
-                          (point-max)))
-         ))))
+                          (point-max))))
+       ))))
 
 (defun mime-view-default-content-header-filter ()
   (mime-view-cut-header)
@@ -313,20 +265,26 @@ Please redefine this function if you want to change default setting."
 ;;;
 
 (defvar mime-view-content-filter-alist
-  '(("text/enriched" . mime-preview/filter-for-text/enriched)
-    ("text/richtext" . mime-preview/filter-for-text/richtext)
-    (t . mime-preview/filter-for-text/plain)
-    ))
+  '(("text/enriched" . mime-view-filter-for-text/enriched)
+    ("text/richtext" . mime-view-filter-for-text/richtext)
+    (t . mime-view-filter-for-text/plain)
+    )
+  "Alist of media-types vs. corresponding MIME-View filter functions.
+Each element looks like (TYPE/SUBTYPE . FUNCTION) or (t . FUNCTION).
+TYPE/SUBTYPE is a string of media-type and FUNCTION is a filter
+function.  t means default media-type.")
 
 
 ;;; @@ entity separator
 ;;;
 
-(defun mime-view-entity-separator-function (rcnum cinfo ctype params subj)
+(defun mime-view-entity-separator-function (rcnum cinfo
+                                                 media-type media-subtype
+                                                 params subj)
   "Insert entity separator conditionally.
 Please redefine this function if you want to change default setting."
   (or (mime-view-header-visible-p rcnum cinfo)
-      (mime-view-body-visible-p rcnum cinfo ctype)
+      (mime-view-body-visible-p rcnum cinfo media-type media-subtype)
       (progn
        (goto-char (point-max))
        (insert "\n")
@@ -339,42 +297,73 @@ Please redefine this function if you want to change default setting."
 ;;; @@@ in raw buffer
 ;;;
 
-(make-variable-buffer-local 'mime::article/content-info)
+(defvar mime-raw-entity-info
+  "Information about structure of message.
+Please use reference function `mime-entity-info-SLOT' to get value of
+SLOT.
 
-(defvar mime::article/preview-buffer nil)
-(make-variable-buffer-local 'mime::article/preview-buffer)
+Following is a list of slots of the structure:
+
+rcnum          reversed content-number (list)
+point-min      beginning point of region in raw-buffer
+point-max      end point of region in raw-buffer
+type           media-type (symbol)
+subtype                media-subtype (symbol)
+type/subtype   media-type/subtype (string or nil)
+parameters     parameter of Content-Type field (association list)
+encoding       Content-Transfer-Encoding (string or nil)
+children       entities included in this entity (list of content-infos)
+
+If an entity includes other entities in its body, such as multipart or
+message/rfc822, entity-infos of other entities are included in
+`children', so entity-info become a tree.")
+(make-variable-buffer-local 'mime-raw-entity-info)
+
+(defvar mime-preview-buffer nil
+  "MIME preview buffer corresponding with the (raw) buffer.")
+(make-variable-buffer-local 'mime-preview-buffer)
 
 
 ;;; @@@ in view buffer
 ;;;
 
-(make-variable-buffer-local 'mime::preview/mother-buffer)
-(make-variable-buffer-local 'mime::preview/content-list)
+(defvar mime-mother-buffer nil
+  "Mother buffer corresponding with the (MIME-View) buffer.
+If current MIME-View buffer is generated by other buffer, such as
+message/partial, it is called `mother-buffer'.")
+(make-variable-buffer-local 'mime-mother-buffer)
 
-(defvar mime::preview/article-buffer nil)
-(make-variable-buffer-local 'mime::preview/article-buffer)
+(defvar mime-raw-buffer nil
+  "Raw buffer corresponding with the (MIME-View) buffer.")
+(make-variable-buffer-local 'mime-raw-buffer)
 
-(make-variable-buffer-local 'mime::preview/original-major-mode)
-(make-variable-buffer-local 'mime::preview/original-window-configuration)
+(defvar mime-preview-original-major-mode nil
+  "Major-mode of mime-raw-buffer.")
+(make-variable-buffer-local 'mime-preview-original-major-mode)
+
+(make-variable-buffer-local 'mime-preview-original-window-configuration)
 
 
 ;;; @@ quitting method
 ;;;
 
 (defvar mime-view-quitting-method-alist
-  '((mime/show-message-mode
-     . mime-view-quitting-method-for-mime/show-message-mode)))
+  '((mime-show-message-mode
+     . mime-view-quitting-method-for-mime-show-message-mode))
+  "Alist of major-mode vs. quitting-method of mime-view.")
 
 (defvar mime-view-over-to-previous-method-alist nil)
 (defvar mime-view-over-to-next-method-alist nil)
 
-(defvar mime-view-show-summary-method nil)
+(defvar mime-view-show-summary-method nil
+  "Alist of major-mode vs. show-summary-method.")
 
 
 ;;; @@ following method
 ;;;
 
-(defvar mime-view-following-method-alist nil)
+(defvar mime-view-following-method-alist nil
+  "Alist of major-mode vs. following-method of mime-view.")
 
 (defvar mime-view-following-required-fields-list
   '("From"))
@@ -412,81 +401,60 @@ The compressed face will be piped to this command.")
          ))))
 
 
-;;; @@ utility
-;;;
-
-(defun mime-preview/get-original-major-mode ()
-  (if mime::preview/mother-buffer
-      (save-excursion
-       (set-buffer mime::preview/mother-buffer)
-       (mime-preview/get-original-major-mode)
-       )
-    mime::preview/original-major-mode))
-
-
-;;; @ data structures
-;;;
-
-;;; @@ preview-content-info
-;;;
-
-(define-structure mime::preview-content-info
-  point-min point-max buffer content-info)
-
-
 ;;; @ buffer setup
 ;;;
 
-(defun mime-view-setup-buffer (&optional ctl encoding ibuf obuf)
+(defun mime-view-setup-buffers (&optional ctl encoding ibuf obuf)
   (if ibuf
       (progn
        (get-buffer ibuf)
        (set-buffer ibuf)
        ))
   (or mime-view-redisplay
-      (setq mime::article/content-info (mime-parse-message ctl encoding))
+      (setq mime-raw-entity-info (mime-parse-message ctl encoding))
       )
-  (let ((ret (mime-view-make-preview-buffer obuf)))
-    (setq mime::article/preview-buffer (car ret))
-    ret))
-
-(defun mime-view-make-preview-buffer (&optional obuf)
-  (let* ((cinfo mime::article/content-info)
+  (let* ((cinfo mime-raw-entity-info)
         (pcl (mime/flatten-content-info cinfo))
-        (dest (make-list (length pcl) nil))
         (the-buf (current-buffer))
         (mode major-mode)
         )
     (or obuf
        (setq obuf (concat "*Preview-" (buffer-name the-buf) "*")))
     (set-buffer (get-buffer-create obuf))
-    (setq buffer-read-only nil)
-    (widen)
-    (erase-buffer)
-    (setq mime::preview/article-buffer the-buf)
-    (setq mime::preview/original-major-mode mode)
-    (setq major-mode 'mime-view-mode)
-    (setq mode-name "MIME-View")
-    (let ((drest dest))
+    (let ((inhibit-read-only t))
+      ;;(setq buffer-read-only nil)
+      (widen)
+      (erase-buffer)
+      (setq mime-raw-buffer the-buf)
+      (setq mime-preview-original-major-mode mode)
+      (setq major-mode 'mime-view-mode)
+      (setq mode-name "MIME-View")
       (while pcl
-       (setcar drest
-               (mime-preview/display-content (car pcl) cinfo the-buf obuf))
-       (setq pcl (cdr pcl)
-             drest (cdr drest))
-       ))
-    (set-buffer-modified-p nil)
+       (mime-view-display-entity (car pcl) cinfo the-buf obuf)
+       (setq pcl (cdr pcl))
+       )
+      (set-buffer-modified-p nil)
+      )
     (setq buffer-read-only t)
     (set-buffer the-buf)
-    (list obuf dest)
-    ))
+    )
+  (setq mime-preview-buffer obuf)
+  )
 
-(defun mime-preview/display-content (content cinfo ibuf obuf)
-  (let* ((beg (mime::content-info/point-min content))
-        (end (mime::content-info/point-max content))
-        (ctype (mime::content-info/type content))
-        (params (mime::content-info/parameters content))
-        (encoding (mime::content-info/encoding content))
-        (rcnum (mime::content-info/rcnum content))
+(defun mime-view-display-entity (content cinfo ibuf obuf)
+  "Display entity from content-info CONTENT."
+  (let* ((beg (mime-entity-info-point-min content))
+        (end (mime-entity-info-point-max content))
+        (media-type (mime-entity-info-media-type content))
+        (media-subtype (mime-entity-info-media-subtype content))
+        (ctype (if media-type
+                   (if media-subtype
+                       (format "%s/%s" media-type media-subtype)
+                     (symbol-name media-type)
+                     )))
+        (params (mime-entity-info-parameters content))
+        (encoding (mime-entity-info-encoding content))
+        (rcnum (mime-entity-info-rnum content))
         he e nb ne subj)
     (set-buffer ibuf)
     (goto-char beg)
@@ -505,9 +473,10 @@ The compressed face will be piped to this command.")
     (set-buffer obuf)
     (setq nb (point))
     (narrow-to-region nb nb)
-    (mime-view-entity-button-function rcnum cinfo ctype params subj encoding)
+    (mime-view-entity-button-function
+     rcnum cinfo media-type media-subtype params subj encoding)
     (if (mime-view-header-visible-p rcnum cinfo)
-       (mime-preview/display-header beg he)
+       (mime-view-display-header beg he)
       )
     (if (and (null rcnum)
             (member
@@ -515,39 +484,36 @@ The compressed face will be piped to this command.")
        (save-excursion
          (goto-char (point-max))
          (mime-view-insert-entity-button
-          rcnum cinfo ctype params subj encoding)
+          rcnum cinfo media-type media-subtype params subj encoding)
          ))
-    (cond ((mime-view-body-visible-p rcnum cinfo ctype)
-          (mime-preview/display-body he end
+    (cond ((mime-view-body-visible-p rcnum cinfo media-type media-subtype)
+          (mime-view-display-body he end
                                      rcnum cinfo ctype params subj encoding)
           )
-         ((equal ctype "message/partial")
-          (mime-preview/display-message/partial)
+         ((and (eq media-type 'message)(eq media-subtype 'partial))
+          (mime-view-insert-message/partial-button)
           )
          ((and (null rcnum)
-               (null (mime::content-info/children cinfo))
+               (null (mime-entity-info-children cinfo))
                )
           (goto-char (point-max))
           (mime-view-insert-entity-button
-           rcnum cinfo ctype params subj encoding)
+           rcnum cinfo media-type media-subtype params subj encoding)
           ))
-    (mime-view-entity-separator-function rcnum cinfo ctype params subj)
-    (prog1
-       (progn
-         (setq ne (point-max))
-         (widen)
-         (put-text-property nb ne 'mime-view-raw-buffer ibuf)
-         (put-text-property nb ne 'mime-view-cinfo content)
-         (mime::preview-content-info/create nb (1- ne) ibuf content)
-         )
-      (goto-char ne)
-      )))
+    (mime-view-entity-separator-function
+     rcnum cinfo media-type media-subtype params subj)
+    (setq ne (point-max))
+    (widen)
+    (put-text-property nb ne 'mime-view-raw-buffer ibuf)
+    (put-text-property nb ne 'mime-view-cinfo content)
+    (goto-char ne)
+    ))
 
-(defun mime-preview/display-header (beg end)
+(defun mime-view-display-header (beg end)
   (save-restriction
     (narrow-to-region (point)(point))
-    (insert-buffer-substring mime::preview/article-buffer beg end)
-    (let ((f (cdr (assq mime::preview/original-major-mode
+    (insert-buffer-substring mime-raw-buffer beg end)
+    (let ((f (cdr (assq mime-preview-original-major-mode
                        mime-view-content-header-filter-alist))))
       (if (functionp f)
          (funcall f)
@@ -556,11 +522,10 @@ The compressed face will be piped to this command.")
     (run-hooks 'mime-view-content-header-filter-hook)
     ))
 
-(defun mime-preview/display-body (beg end
-                                     rcnum cinfo ctype params subj encoding)
+(defun mime-view-display-body (beg end rcnum cinfo ctype params subj encoding)
   (save-restriction
     (narrow-to-region (point-max)(point-max))
-    (insert-buffer-substring mime::preview/article-buffer beg end)
+    (insert-buffer-substring mime-raw-buffer beg end)
     (let ((f (cdr (or (assoc ctype mime-view-content-filter-alist)
                      (assq t mime-view-content-filter-alist)))))
       (and (functionp f)
@@ -568,18 +533,18 @@ The compressed face will be piped to this command.")
           )
       )))
 
-(defun mime-preview/display-message/partial ()
+(defun mime-view-insert-message/partial-button ()
   (save-restriction
     (goto-char (point-max))
     (if (not (search-backward "\n\n" nil t))
        (insert "\n")
       )
-    (let ((be (point-max)))
-      (narrow-to-region be be)
-      (insert mime-view-announcement-for-message/partial)
-      (mime-add-button (point-min)(point-max)
-                      (function mime-view-play-current-entity))
-      )))
+    (goto-char (point-max))
+    (narrow-to-region (point-max)(point-max))
+    (insert mime-view-announcement-for-message/partial)
+    (mime-add-button (point-min)(point-max)
+                    (function mime-preview-play-current-entity))
+    ))
 
 (defun mime-article/get-uu-filename (param &optional encoding)
   (if (member (or encoding
@@ -609,16 +574,16 @@ The compressed face will be piped to this command.")
       ""))
 
 
-;;; @ content information
+;;; @ entity information
 ;;;
 
 (defun mime-article/point-content-number (p &optional cinfo)
   (or cinfo
-      (setq cinfo mime::article/content-info)
+      (setq cinfo mime-raw-entity-info)
       )
-  (let ((b (mime::content-info/point-min cinfo))
-       (e (mime::content-info/point-max cinfo))
-       (c (mime::content-info/children cinfo))
+  (let ((b (mime-entity-info-point-min cinfo))
+       (e (mime-entity-info-point-max cinfo))
+       (c (mime-entity-info-children cinfo))
        )
     (if (and (<= b p)(<= p e))
        (or (let (co ret (sn 0))
@@ -634,27 +599,20 @@ The compressed face will be piped to this command.")
                  )))
            t))))
 
-(defun mime-article/rcnum-to-cinfo (rcnum &optional cinfo)
-  (or cinfo
-      (setq cinfo mime::article/content-info)
-      )
-  (find-if (function
-           (lambda (ci)
-             (equal (mime::content-info/rcnum ci) rcnum)
-             ))
-          (mime/flatten-content-info cinfo)
-          ))
+(defsubst mime-article/rcnum-to-cinfo (rnum &optional cinfo)
+  (mime-article/cnum-to-cinfo (reverse rnum) cinfo)
+  )
 
 (defun mime-article/cnum-to-cinfo (cn &optional cinfo)
   (or cinfo
-      (setq cinfo mime::article/content-info)
+      (setq cinfo mime-raw-entity-info)
       )
   (if (eq cn t)
       cinfo
     (let ((sn (car cn)))
       (if (null sn)
          cinfo
-       (let ((rc (nth sn (mime::content-info/children cinfo))))
+       (let ((rc (nth sn (mime-entity-info-children cinfo))))
          (if rc
              (mime-article/cnum-to-cinfo (cdr cn) rc)
            ))
@@ -662,10 +620,10 @@ The compressed face will be piped to this command.")
 
 (defun mime/flatten-content-info (&optional cinfo)
   (or cinfo
-      (setq cinfo mime::article/content-info)
+      (setq cinfo mime-raw-entity-info)
       )
   (let ((dest (list cinfo))
-       (rcl (mime::content-info/children cinfo))
+       (rcl (mime-entity-info-children cinfo))
        )
     (while rcl
       (setq dest (nconc dest (mime/flatten-content-info (car rcl))))
@@ -673,22 +631,32 @@ The compressed face will be piped to this command.")
       )
     dest))
 
-(defun mime-preview/point-pcinfo (p &optional pcl)
-  (or pcl
-      (setq pcl mime::preview/content-list)
-      )
-  (catch 'tag
-    (let ((r pcl) cell)
-      (while r
-       (setq cell (car r))
-       (if (and (<= (mime::preview-content-info/point-min cell) p)
-                (<= p (mime::preview-content-info/point-max cell))
-                )
-           (throw 'tag cell)
-         )
-       (setq r (cdr r))
-       ))
-    (car (last pcl))
+
+;;; @@ predicate functions
+;;;
+
+(defun mime-view-header-visible-p (rcnum cinfo)
+  "Return non-nil if header of current entity is visible."
+  (or (null rcnum)
+      (member (mime-entity-info-type/subtype
+              (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo))
+             mime-view-childrens-header-showing-Content-Type-list)
+      ))
+
+(defun mime-view-body-visible-p (rcnum cinfo media-type media-subtype)
+  (let ((ctype (if media-type
+                  (if media-subtype
+                      (format "%s/%s" media-type media-subtype)
+                    (symbol-name media-type)
+                    ))))
+    (and (member ctype mime-view-visible-media-type-list)
+        (if (and (eq media-type 'application)
+                 (eq media-subtype 'octet-stream))
+            (let ((ccinfo (mime-article/rcnum-to-cinfo rcnum cinfo)))
+              (member (mime-entity-info-encoding ccinfo)
+                      '(nil "7bit" "8bit"))
+              )
+          t))
     ))
 
 
@@ -697,15 +665,15 @@ The compressed face will be piped to this command.")
 
 (defconst mime-view-menu-title "MIME-View")
 (defconst mime-view-menu-list
-  '((up                 "Move to upper content"      mime-view-up-content)
-    (previous   "Move to previous content"   mime-view-previous-content)
-    (next       "Move to next content"       mime-view-next-content)
-    (scroll-down "Scroll to previous content" mime-view-scroll-down-content)
-    (scroll-up  "Scroll to next content"     mime-view-scroll-up-content)
-    (play       "Play Content"               mime-view-play-current-entity)
-    (extract    "Extract Content"            mime-view-extract-current-entity)
-    (print      "Print"                      mime-view-print-current-entity)
-    (x-face     "Show X Face"                mime-view-display-x-face)
+  '((up                 "Move to upper entity"    mime-preview-move-to-upper)
+    (previous   "Move to previous entity" mime-preview-move-to-previous)
+    (next       "Move to next entity"     mime-preview-move-to-next)
+    (scroll-down "Scroll-down"             mime-preview-scroll-down-entity)
+    (scroll-up  "Scroll-up"               mime-preview-scroll-up-entity)
+    (play       "Play current entity"     mime-preview-play-current-entity)
+    (extract    "Extract current entity"  mime-preview-extract-current-entity)
+    (print      "Print current entity"    mime-preview-print-current-entity)
+    (x-face     "Show X Face"             mime-view-display-x-face)
     )
   "Menu for MIME Viewer")
 
@@ -735,49 +703,59 @@ The compressed face will be piped to this command.")
                              (make-sparse-keymap)
                              )))
     (define-key mime-view-mode-map
-      "u"        (function mime-view-up-content))
+      "u"        (function mime-preview-move-to-upper))
     (define-key mime-view-mode-map
-      "p"        (function mime-view-previous-content))
+      "p"        (function mime-preview-move-to-previous))
     (define-key mime-view-mode-map
-      "n"        (function mime-view-next-content))
+      "n"        (function mime-preview-move-to-next))
     (define-key mime-view-mode-map
-      "\e\t"     (function mime-view-previous-content))
+      "\e\t"     (function mime-preview-move-to-previous))
     (define-key mime-view-mode-map
-      "\t"       (function mime-view-next-content))
+      "\t"       (function mime-preview-move-to-next))
     (define-key mime-view-mode-map
-      " "        (function mime-view-scroll-up-content))
+      " "        (function mime-preview-scroll-up-entity))
     (define-key mime-view-mode-map
-      "\M- "     (function mime-view-scroll-down-content))
+      "\M- "     (function mime-preview-scroll-down-entity))
     (define-key mime-view-mode-map
-      "\177"     (function mime-view-scroll-down-content))
+      "\177"     (function mime-preview-scroll-down-entity))
     (define-key mime-view-mode-map
-      "\C-m"     (function mime-view-next-line-content))
+      "\C-m"     (function mime-preview-next-line-entity))
     (define-key mime-view-mode-map
-      "\C-\M-m"  (function mime-view-previous-line-content))
+      "\C-\M-m"  (function mime-preview-previous-line-entity))
     (define-key mime-view-mode-map
-      "v"        (function mime-view-play-current-entity))
+      "v"        (function mime-preview-play-current-entity))
     (define-key mime-view-mode-map
-      "e"        (function mime-view-extract-current-entity))
+      "e"        (function mime-preview-extract-current-entity))
     (define-key mime-view-mode-map
-      "\C-c\C-p" (function mime-view-print-current-entity))
+      "\C-c\C-p" (function mime-preview-print-current-entity))
     (define-key mime-view-mode-map
-      "a"        (function mime-view-follow-content))
+      "a"        (function mime-preview-follow-current-entity))
     (define-key mime-view-mode-map
-      "q"        (function mime-view-quit))
+      "q"        (function mime-preview-quit))
     (define-key mime-view-mode-map
-      "h"        (function mime-view-show-summary))
+      "h"        (function mime-preview-show-summary))
     (define-key mime-view-mode-map
-      "\C-c\C-x" (function mime-view-kill-buffer))
+      "\C-c\C-x" (function mime-preview-kill-buffer))
+    ;; (define-key mime-view-mode-map
+    ;;   "<"        (function beginning-of-buffer))
+    ;; (define-key mime-view-mode-map
+    ;;   ">"        (function end-of-buffer))
     (define-key mime-view-mode-map
-      "<"        (function beginning-of-buffer))
+      "?"        (function describe-mode))
     (define-key mime-view-mode-map
-      ">"        (function end-of-buffer))
+      [tab] (function mime-preview-move-to-next))
     (define-key mime-view-mode-map
-      "?"        (function describe-mode))
+      [delete] (function mime-preview-scroll-down-entity))
+    (define-key mime-view-mode-map
+      [backspace] (function mime-preview-scroll-down-entity))
     (if (functionp default)
-       (setq mime-view-mode-map
-             (append mime-view-mode-map (list (cons t default)))
-             ))
+       (cond (running-xemacs
+              (set-keymap-default-binding mime-view-mode-map default)
+              )
+             (t
+              (setq mime-view-mode-map
+                    (append mime-view-mode-map (list (cons t default))))
+              )))
     (if mouse-button-2
        (define-key mime-view-mode-map
          mouse-button-2 (function mime-button-dispatcher))
@@ -804,6 +782,20 @@ The compressed face will be piped to this command.")
     (run-hooks 'mime-view-define-keymap-hook)
     ))
 
+(defsubst mime-maybe-hide-echo-buffer ()
+  "Clear mime-echo buffer and delete window for it."
+  (let ((buf (get-buffer mime-echo-buffer-name)))
+    (if buf
+       (save-excursion
+         (set-buffer buf)
+         (erase-buffer)
+         (let ((win (get-buffer-window buf)))
+           (if win
+               (delete-window win)
+             ))
+         (bury-buffer buf)
+         ))))
+
 (defun mime-view-mode (&optional mother ctl encoding ibuf obuf
                                 default-keymap-or-function)
   "Major mode for viewing MIME message.
@@ -830,364 +822,361 @@ button-2        Move to point under the mouse cursor
                and decode current content as `play mode'
 "
   (interactive)
-  (let ((buf (get-buffer mime/output-buffer-name)))
-    (if buf
-       (save-excursion
-         (set-buffer buf)
-         (erase-buffer)
-         )))
-  (let ((ret (mime-view-setup-buffer ctl encoding ibuf obuf))
+  (mime-maybe-hide-echo-buffer)
+  (let ((ret (mime-view-setup-buffers ctl encoding ibuf obuf))
        (win-conf (current-window-configuration))
        )
     (prog1
-       (switch-to-buffer (car ret))
-      (setq mime::preview/original-window-configuration win-conf)
+       (switch-to-buffer ret)
+      (setq mime-preview-original-window-configuration win-conf)
       (if mother
          (progn
-           (setq mime::preview/mother-buffer mother)
+           (setq mime-mother-buffer mother)
            ))
       (mime-view-define-keymap default-keymap-or-function)
-      (setq mime::preview/content-list (nth 1 ret))
-      (goto-char
-       (let ((ce (mime::preview-content-info/point-max
-                 (car mime::preview/content-list)
-                 ))
-            e)
-        (goto-char (point-min))
-        (search-forward "\n\n" nil t)
-        (setq e (match-end 0))
-        (if (<= e ce)
-            e
-          ce)))
+      (let ((point (next-single-property-change (point-min) 'mime-view-cinfo)))
+       (if point
+           (goto-char point)
+         (goto-char (point-min))
+         (search-forward "\n\n" nil t)
+         ))
       (run-hooks 'mime-view-mode-hook)
       )))
 
-(defun mime-preview/point-content-number (point)
-  (save-window-excursion
-    (let ((pc (mime-preview/point-pcinfo (point)))
-         cinfo)
-      (switch-to-buffer (mime::preview-content-info/buffer pc))
-      (setq cinfo (mime::preview-content-info/content-info pc))
-      (mime-article/point-content-number (mime::content-info/point-min cinfo))
-      )))
 
-(defun mime-preview/cinfo-to-pcinfo (cinfo)
-  (let ((rpcl mime::preview/content-list) cell)
-    (catch 'tag
-      (while rpcl
-       (setq cell (car rpcl))
-       (if (eq cinfo (mime::preview-content-info/content-info cell))
-           (throw 'tag cell)
-         )
-       (setq rpcl (cdr rpcl))
-       ))))
+;;; @@ playing
+;;;
 
-(autoload 'mime-view-play-current-entity "mime-play" "Play current entity." t)
+(autoload 'mime-preview-play-current-entity "mime-play"
+  "Play current entity." t)
 
-(defun mime-view-extract-current-entity ()
+(defun mime-preview-extract-current-entity ()
   "Extract current entity into file (maybe).
 It decodes current entity to call internal or external method as
 \"extract\" mode.  The method is selected from variable
-`mime/content-decoding-condition'."
+`mime-acting-condition'."
   (interactive)
-  (mime-view-play-current-entity "extract")
+  (mime-preview-play-current-entity "extract")
   )
 
-(defun mime-view-print-current-entity ()
+(defun mime-preview-print-current-entity ()
   "Print current entity (maybe).
 It decodes current entity to call internal or external method as
 \"print\" mode.  The method is selected from variable
-`mime/content-decoding-condition'."
+`mime-acting-condition'."
   (interactive)
-  (mime-view-play-current-entity "print")
+  (mime-preview-play-current-entity "print")
   )
 
-(defun mime-view-follow-content ()
+
+;;; @@ following
+;;;
+
+(defun mime-view-get-original-major-mode ()
+  "Return major-mode of original buffer.
+If a current buffer has mime-mother-buffer, return original major-mode
+of the mother-buffer."
+  (if mime-mother-buffer
+      (save-excursion
+       (set-buffer mime-mother-buffer)
+       (mime-view-get-original-major-mode)
+       )
+    mime-preview-original-major-mode))
+
+(defun mime-preview-follow-current-entity ()
+  "Write follow message to current entity.
+It calls following-method selected from variable
+`mime-view-following-method-alist'."
   (interactive)
-  (let ((root-cinfo
-        (mime::preview-content-info/content-info
-         (car mime::preview/content-list)))
-       pc p-beg p-end cinfo rcnum)
-    (let ((rest mime::preview/content-list)
-         b e cell len rc)
-      (if (catch 'tag
-           (while (setq cell (car rest))
-             (setq b (mime::preview-content-info/point-min cell)
-                   e (mime::preview-content-info/point-max cell))
-             (setq rest (cdr rest))
-             (if (and (<= b (point))(<= (point) e))
-                 (throw 'tag cell)
-               )
-             ))
-         (progn
-           (setq pc cell
-                 cinfo (mime::preview-content-info/content-info pc)
-                 rcnum (mime::content-info/rcnum cinfo))
-           (setq len (length rcnum))
-           (setq p-beg (mime::preview-content-info/point-min pc)
-                 p-end (mime::preview-content-info/point-max pc))
-           (while (and (setq cell (car rest))
-                       (progn
-                         (setq rc
-                               (mime::content-info/rcnum
-                                (mime::preview-content-info/content-info
-                                 cell)))
-                         (equal rcnum
-                                (nthcdr (- (length rc) len) rc))
-                         ))
-             (setq p-end (mime::preview-content-info/point-max cell))
-             (setq rest (cdr rest))
-             ))))
-    (if pc
-       (let* ((mode (mime-preview/get-original-major-mode))
-              (new-name (format "%s-%s" (buffer-name) (reverse rcnum)))
-              new-buf
-              (the-buf (current-buffer))
-              (a-buf mime::preview/article-buffer)
-              fields)
-         (save-excursion
-           (set-buffer (setq new-buf (get-buffer-create new-name)))
-           (erase-buffer)
-           (insert-buffer-substring the-buf p-beg p-end)
-           (goto-char (point-min))
-           (if (mime-view-header-visible-p rcnum root-cinfo)
-               (delete-region (goto-char (point-min))
-                              (if (re-search-forward "^$" nil t)
-                                  (match-end 0)
-                                (point-min)))
-             )
-           (goto-char (point-min))
-           (insert "\n")
-           (goto-char (point-min))
-           (let ((rcnum (mime::content-info/rcnum cinfo)) ci str)
-             (while (progn
-                      (setq str
-                            (save-excursion
-                              (set-buffer a-buf)
-                              (setq ci (mime-article/rcnum-to-cinfo rcnum))
-                              (save-restriction
-                                (narrow-to-region
-                                 (mime::content-info/point-min ci)
-                                 (mime::content-info/point-max ci)
-                                 )
-                                (std11-header-string-except
-                                 (concat "^"
-                                         (apply (function regexp-or) fields)
-                                         ":") ""))))
-                      (if (string= (mime::content-info/type ci)
-                                   "message/rfc822")
-                          nil
-                        (if str
-                            (insert str)
-                          )
-                        rcnum))
-               (setq fields (std11-collect-field-names)
-                     rcnum (cdr rcnum))
-               )
+  (let ((root-cinfo (get-text-property (point-min) 'mime-view-cinfo))
+       cinfo)
+    (while (null (setq cinfo (get-text-property (point) 'mime-view-cinfo)))
+      (backward-char)
+      )
+    (let* ((p-beg (previous-single-property-change (point) 'mime-view-cinfo))
+          p-end
+          (rcnum (mime-entity-info-rnum cinfo))
+          (len (length rcnum))
+          )
+      (cond ((null p-beg)
+            (setq p-beg
+                  (if (eq (next-single-property-change (point-min)
+                                                       'mime-view-cinfo)
+                          (point))
+                      (point)
+                    (point-min)))
+            )
+           ((eq (next-single-property-change p-beg 'mime-view-cinfo)
+                (point))
+            (setq p-beg (point))
+            ))
+      (setq p-end (next-single-property-change p-beg 'mime-view-cinfo))
+      (cond ((null p-end)
+            (setq p-end (point-max))
+            )
+           ((null rcnum)
+            (setq p-end (point-max))
+            )
+           (t
+            (save-excursion
+              (goto-char p-end)
+              (catch 'tag
+                (let (e)
+                  (while (setq e
+                               (next-single-property-change
+                                (point) 'mime-view-cinfo))
+                    (goto-char e)
+                    (let ((rc (mime-entity-info-rnum
+                               (get-text-property (point)
+                                                  'mime-view-cinfo))))
+                      (or (equal rcnum (nthcdr (- (length rc) len) rc))
+                          (throw 'tag nil)
+                          ))
+                    (setq p-end e)
+                    ))
+                (setq p-end (point-max))
+                ))
+            ))
+      (let* ((mode (mime-view-get-original-major-mode))
+            (new-name (format "%s-%s" (buffer-name) (reverse rcnum)))
+            new-buf
+            (the-buf (current-buffer))
+            (a-buf mime-raw-buffer)
+            fields)
+       (save-excursion
+         (set-buffer (setq new-buf (get-buffer-create new-name)))
+         (erase-buffer)
+         (insert-buffer-substring the-buf p-beg p-end)
+         (goto-char (point-min))
+         (if (mime-view-header-visible-p rcnum root-cinfo)
+             (delete-region (goto-char (point-min))
+                            (if (re-search-forward "^$" nil t)
+                                (match-end 0)
+                              (point-min)))
+           )
+         (goto-char (point-min))
+         (insert "\n")
+         (goto-char (point-min))
+         (let ((rcnum (mime-entity-info-rnum cinfo)) ci str)
+           (while (progn
+                    (setq str
+                          (save-excursion
+                            (set-buffer a-buf)
+                            (setq ci (mime-article/rcnum-to-cinfo rcnum))
+                            (save-restriction
+                              (narrow-to-region
+                               (mime-entity-info-point-min ci)
+                               (mime-entity-info-point-max ci)
+                               )
+                              (std11-header-string-except
+                               (concat "^"
+                                       (apply (function regexp-or) fields)
+                                       ":") ""))))
+                    (if (and
+                         (eq (mime-entity-info-media-type ci) 'message)
+                         (eq (mime-entity-info-media-subtype ci) 'rfc822))
+                        nil
+                      (if str
+                          (insert str)
+                        )
+                      rcnum))
+             (setq fields (std11-collect-field-names)
+                   rcnum (cdr rcnum))
              )
-           (let ((rest mime-view-following-required-fields-list))
-             (while rest
-               (let ((field-name (car rest)))
-                 (or (std11-field-body field-name)
-                     (insert
-                      (format
-                       (concat field-name
-                               ": "
-                               (save-excursion
-                                 (set-buffer the-buf)
-                                 (set-buffer mime::preview/mother-buffer)
-                                 (set-buffer mime::preview/article-buffer)
-                                 (std11-field-body field-name)
-                                 )
-                               "\n")))
-                     ))
-               (setq rest (cdr rest))
-               ))
-           (eword-decode-header)
            )
-         (let ((f (cdr (assq mode mime-view-following-method-alist))))
-           (if (functionp f)
-               (funcall f new-buf)
-             (message
-              (format
-               "Sorry, following method for %s is not implemented yet."
-               mode))
+         (let ((rest mime-view-following-required-fields-list))
+           (while rest
+             (let ((field-name (car rest)))
+               (or (std11-field-body field-name)
+                   (insert
+                    (format
+                     (concat field-name
+                             ": "
+                             (save-excursion
+                               (set-buffer the-buf)
+                               (set-buffer mime-mother-buffer)
+                               (set-buffer mime-raw-buffer)
+                               (std11-field-body field-name)
+                               )
+                             "\n")))
+                   ))
+             (setq rest (cdr rest))
              ))
-         ))))
+         (eword-decode-header)
+         )
+       (let ((f (cdr (assq mode mime-view-following-method-alist))))
+         (if (functionp f)
+             (funcall f new-buf)
+           (message
+            (format
+             "Sorry, following method for %s is not implemented yet."
+             mode))
+           ))
+       ))))
+
+
+;;; @@ X-Face
+;;;
 
 (defun mime-view-display-x-face ()
   (interactive)
   (save-window-excursion
-    (set-buffer mime::preview/article-buffer)
+    (set-buffer mime-raw-buffer)
     (mime-view-x-face-function)
     ))
 
-(defun mime-view-up-content ()
+
+;;; @@ moving
+;;;
+
+(defun mime-preview-move-to-upper ()
+  "Move to upper entity.
+If there is no upper entity, call function `mime-preview-quit'."
   (interactive)
-  (let* ((pc (mime-preview/point-pcinfo (point)))
-        (cinfo (mime::preview-content-info/content-info pc))
-        (rcnum (mime::content-info/rcnum cinfo))
-        )
-    (if rcnum
-       (let ((r (save-excursion
-                  (set-buffer (mime::preview-content-info/buffer pc))
-                   (mime-article/rcnum-to-cinfo (cdr rcnum))
-                  ))
-             (rpcl mime::preview/content-list)
-             cell)
-         (while (and
-                 (setq cell (car rpcl))
-                 (not (eq r (mime::preview-content-info/content-info cell)))
-                 )
-           (setq rpcl (cdr rpcl))
+  (let (cinfo)
+    (while (null (setq cinfo (get-text-property (point) 'mime-view-cinfo)))
+      (backward-char)
+      )
+    (let ((r (mime-article/rcnum-to-cinfo
+             (cdr (mime-entity-info-rnum cinfo))
+             (get-text-property 1 'mime-view-cinfo)))
+         point)
+      (catch 'tag
+       (while (setq point (previous-single-property-change
+                           (point) 'mime-view-cinfo))
+         (goto-char point)
+         (if (eq r (get-text-property (point) 'mime-view-cinfo))
+             (throw 'tag t)
            )
-         (goto-char (mime::preview-content-info/point-min cell))
          )
-      (mime-view-quit)
-      )))
+       (mime-preview-quit)
+       ))))
 
-(defun mime-view-previous-content ()
+(defun mime-preview-move-to-previous ()
+  "Move to previous entity.
+If there is no previous entity, it calls function registered in
+variable `mime-view-over-to-previous-method-alist'."
   (interactive)
-  (let* ((pcl mime::preview/content-list)
-        (p (point))
-        (i (- (length pcl) 1))
-        beg)
-    (catch 'tag
-      (while (> i 0)
-       (setq beg (mime::preview-content-info/point-min (nth i pcl)))
-       (if (> p beg)
-           (throw 'tag (goto-char beg))
-         )
-       (setq i (- i 1))
-       )
-      (let ((f (assq mime::preview/original-major-mode
+  (while (null (get-text-property (point) 'mime-view-cinfo))
+    (backward-char)
+    )
+  (let ((point (previous-single-property-change (point) 'mime-view-cinfo)))
+    (if point
+       (goto-char point)
+      (let ((f (assq mime-preview-original-major-mode
                     mime-view-over-to-previous-method-alist)))
        (if f
            (funcall (cdr f))
          ))
-      )
-    ))
+      )))
 
-(defun mime-view-next-content ()
+(defun mime-preview-move-to-next ()
+  "Move to next entity.
+If there is no previous entity, it calls function registered in
+variable `mime-view-over-to-next-method-alist'."
   (interactive)
-  (let ((pcl mime::preview/content-list)
-       (p (point))
-       beg)
-    (catch 'tag
-      (while pcl
-       (setq beg (mime::preview-content-info/point-min (car pcl)))
-       (if (< p beg)
-           (throw 'tag (goto-char beg))
-         )
-       (setq pcl (cdr pcl))
-       )
-      (let ((f (assq mime::preview/original-major-mode
+  (let ((point (next-single-property-change (point) 'mime-view-cinfo)))
+    (if point
+       (goto-char point)
+      (let ((f (assq mime-preview-original-major-mode
                     mime-view-over-to-next-method-alist)))
        (if f
            (funcall (cdr f))
          ))
-      )
-    ))
+      )))
 
-(defun mime-view-scroll-up-content (&optional h)
+(defun mime-preview-scroll-up-entity (&optional h)
+  "Scroll up current entity.
+If reached to (point-max), it calls function registered in variable
+`mime-view-over-to-next-method-alist'."
   (interactive)
   (or h
-      (setq h (- (window-height) 1))
+      (setq h (1- (window-height)))
       )
   (if (= (point) (point-max))
-      (let ((f (assq mime::preview/original-major-mode
+      (let ((f (assq mime-preview-original-major-mode
                      mime-view-over-to-next-method-alist)))
         (if f
             (funcall (cdr f))
           ))
-    (let ((pcl mime::preview/content-list)
-          (p (point))
-          np beg)
-      (setq np
-            (or (catch 'tag
-                  (while pcl
-                    (setq beg (mime::preview-content-info/point-min (car pcl)))
-                    (if (< p beg)
-                        (throw 'tag beg)
-                      )
-                    (setq pcl (cdr pcl))
-                    ))
-                (point-max)))
+    (let ((point
+          (or (next-single-property-change (point) 'mime-view-cinfo)
+              (point-max))))
       (forward-line h)
-      (if (> (point) np)
-          (goto-char np)
+      (if (> (point) point)
+          (goto-char point)
         )
-      ;;(show-subtree)
-      ))
-  )
+      )))
 
-(defun mime-view-scroll-down-content (&optional h)
+(defun mime-preview-scroll-down-entity (&optional h)
+  "Scroll down current entity.
+If reached to (point-min), it calls function registered in variable
+`mime-view-over-to-previous-method-alist'."
   (interactive)
   (or h
-      (setq h (- (window-height) 1))
+      (setq h (1- (window-height)))
       )
   (if (= (point) (point-min))
-      (let ((f (assq mime::preview/original-major-mode
+      (let ((f (assq mime-preview-original-major-mode
                      mime-view-over-to-previous-method-alist)))
         (if f
             (funcall (cdr f))
           ))
-    (let ((pcl mime::preview/content-list)
-          (p (point))
-          pp beg)
-      (setq pp
-            (or (let ((i (- (length pcl) 1)))
-                  (catch 'tag
-                    (while (> i 0)
-                      (setq beg (mime::preview-content-info/point-min
-                                 (nth i pcl)))
-                      (if (> p beg)
-                          (throw 'tag beg)
-                        )
-                      (setq i (- i 1))
-                      )))
-                (point-min)))
+    (let (point)
+      (save-excursion
+       (catch 'tag
+         (while (> (point) 1)
+           (if (setq point
+                     (previous-single-property-change (point)
+                                                      'mime-view-cinfo))
+               (throw 'tag t)
+             )
+           (backward-char)
+           )
+         (setq point (point-min))
+         ))
       (forward-line (- h))
-      (if (< (point) pp)
-          (goto-char pp)
-        )))
-  )
+      (if (< (point) point)
+          (goto-char point)
+        ))))
 
-(defun mime-view-next-line-content ()
+(defun mime-preview-next-line-entity ()
   (interactive)
-  (mime-view-scroll-up-content 1)
+  (mime-preview-scroll-up-entity 1)
   )
 
-(defun mime-view-previous-line-content ()
+(defun mime-preview-previous-line-entity ()
   (interactive)
-  (mime-view-scroll-down-content 1)
+  (mime-preview-scroll-down-entity 1)
   )
 
-(defun mime-view-quit ()
+
+;;; @@ quitting
+;;;
+
+(defun mime-preview-quit ()
+  "Quit from MIME-View buffer.
+It calls function registered in variable
+`mime-view-quitting-method-alist'."
   (interactive)
-  (let ((r (save-excursion
-            (set-buffer (mime::preview-content-info/buffer
-                         (mime-preview/point-pcinfo (point))))
-            (assq major-mode mime-view-quitting-method-alist)
-            )))
+  (let ((r (assq mime-preview-original-major-mode
+                mime-view-quitting-method-alist)))
     (if r
        (funcall (cdr r))
       )))
 
-(defun mime-view-show-summary ()
+(defun mime-preview-show-summary ()
+  "Show summary.
+It calls function registered in variable
+`mime-view-show-summary-method'."
   (interactive)
-  (let ((r (save-excursion
-            (set-buffer
-             (mime::preview-content-info/buffer
-              (mime-preview/point-pcinfo (point)))
-             )
-            (assq major-mode mime-view-show-summary-method)
-            )))
+  (let ((r (assq mime-preview-original-major-mode
+                mime-view-show-summary-method)))
     (if r
        (funcall (cdr r))
       )))
 
-(defun mime-view-kill-buffer ()
+(defun mime-preview-kill-buffer ()
   (interactive)
   (kill-buffer (current-buffer))
   )