New module.

diff --git a/mime-lib.el b/mime-lib.el
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+;;; mime-lib.el --- MIME library module
+
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; 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 'alist)
+(require 'std11)
+(require 'mime-def)
+(require 'eword-decode)
+
+(defun mime-entity-fetch-field (entity field-name)
+  (or (symbolp field-name)
+      (setq field-name (intern (capitalize (capitalize field-name)))))
+  (let* ((header (mime-entity-original-header entity))
+        (field-body (cdr (assq field-name header))))
+    (or field-body
+       (save-excursion
+         (if (save-restriction
+               (set-buffer (mime-entity-buffer entity))
+               (narrow-to-region (mime-entity-header-start entity)
+                                 (mime-entity-header-end entity))
+               (setq field-body (std11-fetch-field (symbol-name field-name)))
+               )
+             (mime-entity-set-original-header
+              entity (put-alist field-name field-body header))
+           )
+         field-body))))
+
+(defun mime-entity-read-field (entity field-name)
+  (or (symbolp field-name)
+      (setq field-name (capitalize (capitalize field-name))))
+  (cond ((eq field-name 'Content-Type)
+        (mime-entity-content-type entity)
+        )
+       ((eq field-name 'Content-Disposition)
+        (mime-entity-content-disposition entity)
+        )
+       ((eq field-name 'Content-Transfer-Encoding)
+        (mime-entity-encoding entity)
+        )
+       (t
+        (let* ((header (mime-entity-parsed-header entity))
+               (field (cdr (assq field-name header))))
+          (or field
+              (let ((field-body (mime-entity-fetch-field entity field-name)))
+                (when field-body
+                  (cond ((memq field-name '(From
+                                            To Recent-To
+                                            Cc Recent-Cc
+                                            Bcc Resent-Bcc))
+                         (setq field (std11-parse-addresses
+                                      (eword-lexical-analyze field-body)))
+                         )
+                        ((eq field-name 'Sender)
+                         (setq field (std11-parse-address
+                                      (eword-lexical-analyze field-body)))
+                         )
+                        ((memq field-name eword-decode-structured-field-list)
+                         (setq field (eword-decode-structured-field-body
+                                      field-body)))
+                        (t
+                         (setq field (eword-decode-unstructured-field-body
+                                      field-body))
+                         ))
+                  (mime-entity-set-parsed-header
+                   entity (put-alist field-name field header))
+                  field)))))))
+
+
+;;; @ end
+;;;
+
+(provide 'mime-lib)
+
+;;; mime-lib.el ends here