New module.

diff --git a/mmexternal.el b/mmexternal.el
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+++ b/mmexternal.el
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+;;; mmexternal.el --- MIME entity module for external buffer
+
+;; Copyright (C) 1998,1999 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <tomo@m17n.org>
+;; Keywords: MIME, multimedia, mail, news
+
+;; This file is part of FLIM (Faithful Library about Internet Message).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, or (at
+;; your option) any later version.
+
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(require 'mime)
+(require 'pces)
+
+(eval-and-compile
+  (luna-define-class mime-external-entity (mime-entity)
+                    (body-buffer
+                     body-file))
+  (luna-define-internal-accessors 'mime-external-entity)
+
+  ;; In an external entity, information of media-type or other
+  ;; information which are represented in a header in a non-external
+  ;; entity are in the body of the parent entity.
+  )
+
+(luna-define-method mime-entity-name ((entity mime-external-entity))
+  (concat "child of "
+         (buffer-name
+          (mime-entity-name
+           (mime-entity-parent-internal entity)))))
+
+
+;; [tomo] We should think about modularity about header presentation...
+
+(defun mime-visible-field-p (field-name visible-fields invisible-fields)
+  (or (catch 'found
+       (while visible-fields
+         (let ((regexp (car visible-fields)))
+           (if (string-match regexp field-name)
+               (throw 'found t)
+             ))
+         (setq visible-fields (cdr visible-fields))
+         ))
+      (catch 'found
+       (while invisible-fields
+         (let ((regexp (car invisible-fields)))
+           (if (string-match regexp field-name)
+               (throw 'found nil)
+             ))
+         (setq invisible-fields (cdr invisible-fields))
+         )
+       t)))
+
+(defun mime-insert-header-from-buffer (buffer start end
+                                             &optional invisible-fields
+                                             visible-fields)
+  (let ((the-buf (current-buffer))
+       (mode-obj (mime-find-field-presentation-method 'wide))
+       field-decoder
+       f-b p f-e field-name len field field-body)
+    (save-excursion
+      (set-buffer buffer)
+      (save-restriction
+       (narrow-to-region start end)
+       (goto-char start)
+       (while (re-search-forward std11-field-head-regexp nil t)
+         (setq f-b (match-beginning 0)
+               p (match-end 0)
+               field-name (buffer-substring f-b p)
+               len (string-width field-name)
+               f-e (std11-field-end))
+         (when (mime-visible-field-p field-name
+                                     visible-fields invisible-fields)
+           (setq field (intern
+                        (capitalize (buffer-substring f-b (1- p))))
+                 field-body (buffer-substring p f-e)
+                 field-decoder (inline (mime-find-field-decoder-internal
+                                        field mode-obj)))
+           (with-current-buffer the-buf
+             (insert field-name)
+             (insert (if field-decoder
+                         (funcall field-decoder field-body len)
+                       ;; Don't decode
+                       field-body))
+             (insert "\n")
+             )))))))
+
+(luna-define-method mime-insert-header ((entity mime-external-entity)
+                                       &optional invisible-fields
+                                       visible-fields)
+  (mime-insert-header-from-buffer
+   (mime-entity-body-buffer (mime-entity-parent-internal entity))
+   (mime-entity-body-start-point (mime-entity-parent-internal entity))
+   (mime-entity-body-end-point (mime-entity-parent-internal entity))
+   invisible-fields visible-fields))
+
+
+(luna-define-method mime-entity-content ((entity mime-external-entity))
+  (let ((buf (mime-entity-body-buffer entity)))
+    (if buf
+       (with-current-buffer buf
+         (mime-decode-string
+          (buffer-string)
+          (mime-entity-encoding entity)))
+      (message "Cannot get external content")
+      nil)))
+
+(luna-define-method mime-entity-fetch-field :around
+  ((entity mime-external-entity) field-name)
+  (or (luna-call-next-method)
+      (save-excursion
+       (mime-goto-body-start-point (mime-entity-parent-internal entity))
+       (save-restriction
+         (narrow-to-region
+          (point)
+          (mime-entity-body-end-point (mime-entity-parent-internal entity)))
+         (let ((ret (std11-fetch-field field-name)))
+           (when ret
+             (or (symbolp field-name)
+                 (setq field-name
+                       (intern (capitalize (capitalize field-name)))))
+             (mime-entity-set-original-header-internal
+              entity
+              (put-alist field-name ret
+                         (mime-entity-original-header-internal entity)))
+             ret))))))
+
+(luna-define-method mime-insert-entity-content ((entity mime-external-entity))
+  (insert
+   (with-current-buffer (mime-external-entity-body-buffer-internal entity)
+     (mime-decode-string
+      (buffer-string)
+      (mime-entity-encoding entity)))))
+
+(mm-define-method write-entity-content ((entity buffer) filename)
+  (save-excursion
+    (set-buffer (mime-external-entity-buffer-internal entity))
+    (mime-write-decoded-region (mime-external-entity-body-start-internal entity)
+                              (mime-external-entity-body-end-internal entity)
+                              filename
+                              (or (mime-entity-encoding entity) "7bit"))
+    ))
+
+(mm-define-method insert-entity ((entity buffer))
+  (insert-buffer-substring (mime-external-entity-buffer-internal entity)
+                          (mime-external-entity-header-start-internal entity)
+                          (mime-external-entity-body-end-internal entity))
+  )
+
+(mm-define-method write-entity ((entity buffer) filename)
+  (save-excursion
+    (set-buffer (mime-external-entity-buffer-internal entity))
+    (write-region-as-raw-text-CRLF
+     (mime-external-entity-header-start-internal entity)
+     (mime-external-entity-body-end-internal entity)
+     filename)
+    ))
+
+(mm-define-method write-entity-body ((entity buffer) filename)
+  (save-excursion
+    (set-buffer (mime-external-entity-buffer-internal entity))
+    (write-region-as-binary (mime-external-entity-body-start-internal entity)
+                           (mime-external-entity-body-end-internal entity)
+                           filename)
+    ))
+
+
+;;; @ header buffer
+;;;
+
+(luna-define-method mime-entity-header-buffer ((entity mime-external-entity))
+  (mime-entity-body-buffer (mime-entity-parent-internal entity)))
+
+(luna-define-method mime-goto-header-start-point ((entity
+                                                  mime-external-entity))
+  (mime-goto-body-start-point (mime-entity-parent-internal entity)))
+
+(luna-define-method mime-entity-header-start-point ((entity
+                                                    mime-external-entity))
+  (mime-entity-body-start-point (mime-entity-parent-internal entity)))
+
+(luna-define-method mime-entity-header-end-point ((entity
+                                                  mime-external-entity))
+  (mime-entity-body-end-point (mime-entity-parent-internal entity)))
+
+
+;;; @ body buffer
+;;;
+
+(luna-define-method mime-entity-body-buffer ((entity mime-external-entity))
+  (or (mime-external-entity-body-buffer-internal entity)
+      (let* ((ct
+             (mime-entity-content-type (mime-entity-parent-internal entity))))
+       (if (string= (mime-content-type-parameter ct "access-type")
+                    "anon-ftp")
+           (let* ((site (mime-content-type-parameter ct "site"))
+                  (directory (mime-content-type-parameter ct "directory"))
+                  (name (mime-content-type-parameter ct "name"))
+                  (pathname
+                   (expand-file-name
+                    name (concat "/anonymous@" site ":" directory)))
+                  (buf (create-file-buffer pathname)))
+             (condition-case nil
+                 (with-current-buffer buf
+                   (insert-file-contents-as-binary pathname)
+                   (mime-external-entity-set-body-buffer-internal
+                    entity buf))
+               (error (message "Cannot open external buffer")))
+             buf)))))
+
+(luna-define-method mime-goto-body-start-point ((entity mime-external-entity))
+  (set-buffer (mime-entity-body-buffer entity))
+  (goto-char (point-min)))
+
+(luna-define-method mime-goto-body-end-point ((entity mime-external-entity))
+  (set-buffer (mime-entity-body-buffer entity))
+  (goto-char (point-max)))
+
+(luna-define-method mime-entity-body-start-point ((entity
+                                                  mime-external-entity))
+  (with-current-buffer (mime-entity-body-buffer entity)
+    (point-min)))
+
+(luna-define-method mime-entity-body-end-point ((entity mime-external-entity))
+  (with-current-buffer (mime-entity-body-buffer entity)
+    (point-max)))
+
+
+;;; @ buffer (obsolete)
+;;;
+
+(luna-define-method mime-entity-buffer ((entity mime-external-entity))
+  (mime-entity-body-buffer entity))
+
+(luna-define-method mime-entity-point-min ((entity mime-external-entity))
+  (mime-entity-body-start-point entity))
+
+(luna-define-method mime-entity-point-max ((entity mime-external-entity))
+  (mime-entity-body-end-point entity))
+
+
+;;; @ end
+;;;
+
+(provide 'mmexternal)
+
+;;; mmexternal.el ends here