mime.el

   1 ;;; mime.el --- MIME library module
   2
   3 ;; Copyright (C) 1998 Free Software Foundation, Inc.
   4
   5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
   6 ;; Keywords: MIME, multimedia, mail, news
   7
   8 ;; This file is part of FLIM (Faithful Library about Internet Message).
   9
  10 ;; This program is free software; you can redistribute it and/or
  11 ;; modify it under the terms of the GNU General Public License as
  12 ;; published by the Free Software Foundation; either version 2, or (at
  13 ;; your option) any later version.
  14
  15 ;; This program is distributed in the hope that it will be useful, but
  16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 ;; General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Code:
  26
  27 (require 'alist)
  28 (require 'std11)
  29 (require 'mime-def)
  30 (require 'eword-decode)
  31
  32 (autoload 'eword-encode-field "eword-encode"
  33   "Encode header field STRING, and return the result.")
  34 (autoload 'eword-encode-header "eword-encode"
  35   "Encode header fields to network representation, such as MIME encoded-word.")
  36
  37
  38 (autoload 'mime-parse-Content-Type "mime-parse"
  39   "Parse STRING as field-body of Content-Type field.")
  40 (autoload 'mime-read-Content-Type "mime-parse"
  41   "Read field-body of Content-Type field from current-buffer,
  42 and return parsed it.")
  43
  44 (autoload 'mime-parse-Content-Disposition "mime-parse"
  45   "Parse STRING as field-body of Content-Disposition field.")
  46 (autoload 'mime-read-Content-Disposition "mime-parse"
  47   "Read field-body of Content-Disposition field from current-buffer,
  48 and return parsed it.")
  49
  50 (autoload 'mime-parse-Content-Transfer-Encoding "mime-parse"
  51   "Parse STRING as field-body of Content-Transfer-Encoding field.")
  52 (autoload 'mime-read-Content-Transfer-Encoding "mime-parse"
  53   "Read field-body of Content-Transfer-Encoding field from
  54 current-buffer, and return it.")
  55
  56 (autoload 'mime-parse-message "mime-parse"
  57   "Parse current-buffer as a MIME message.")
  58
  59 (autoload 'mime-parse-buffer "mime-parse"
  60   "Parse BUFFER as a MIME message.")
  61
  62
  63 ;;; @ Entity as node of message
  64 ;;;
  65
  66 (defun mime-find-entity-from-number (entity-number &optional message)
  67   "Return entity from ENTITY-NUMBER in MESSAGE.
  68 If MESSAGE is not specified, `mime-message-structure' is used."
  69   (or message
  70       (setq message mime-message-structure))
  71   (let ((sn (car entity-number)))
  72     (if (null sn)
  73         message
  74       (let ((rc (nth sn (mime-entity-children message))))
  75         (if rc
  76             (mime-find-entity-from-number (cdr entity-number) rc)
  77           ))
  78       )))
  79
  80 (defsubst mime-find-entity-from-node-id (entity-node-id &optional message)
  81   "Return entity from ENTITY-NODE-ID in MESSAGE.
  82 If MESSAGE is not specified, `mime-message-structure' is used."
  83   (mime-find-entity-from-number (reverse entity-node-id) message))
  84
  85 (defsubst mime-entity-parent (entity &optional message)
  86   "Return mother entity of ENTITY.
  87 If MESSAGE is not specified, `mime-message-structure' in the buffer of
  88 ENTITY is used."
  89   (mime-find-entity-from-node-id
  90    (cdr (mime-entity-node-id entity))
  91    (or message
  92        (save-excursion
  93          (set-buffer (mime-entity-buffer entity))
  94          mime-message-structure))))
  95
  96 (defsubst mime-root-entity-p (entity)
  97   "Return t if ENTITY is root-entity (message)."
  98   (null (mime-entity-node-id entity)))
  99
 100
 101 ;;; @ Entity Header
 102 ;;;
 103
 104 (defun mime-fetch-field (field-name &optional entity)
 105   (or (symbolp field-name)
 106       (setq field-name (intern (capitalize (capitalize field-name)))))
 107   (or entity
 108       (setq entity mime-message-structure))
 109   (let* ((header (mime-entity-original-header entity))
 110          (field-body (cdr (assq field-name header))))
 111     (or field-body
 112         (progn
 113           (if (save-excursion
 114                 (set-buffer (mime-entity-buffer entity))
 115                 (save-restriction
 116                   (narrow-to-region (mime-entity-header-start entity)
 117                                     (mime-entity-header-end entity))
 118                   (setq field-body
 119                         (std11-fetch-field (symbol-name field-name)))
 120                   ))
 121               (mime-entity-set-original-header
 122                entity (put-alist field-name field-body header))
 123             )
 124           field-body))))
 125
 126 (defun mime-read-field (field-name &optional entity)
 127   (or (symbolp field-name)
 128       (setq field-name (capitalize (capitalize field-name))))
 129   (or entity
 130       (setq entity mime-message-structure))
 131   (cond ((eq field-name 'Content-Type)
 132          (mime-entity-content-type entity)
 133          )
 134         ((eq field-name 'Content-Disposition)
 135          (mime-entity-content-disposition entity)
 136          )
 137         ((eq field-name 'Content-Transfer-Encoding)
 138          (mime-entity-encoding entity)
 139          )
 140         (t
 141          (let* ((header (mime-entity-parsed-header entity))
 142                 (field (cdr (assq field-name header))))
 143            (or field
 144                (let ((field-body (mime-fetch-field field-name entity)))
 145                  (when field-body
 146                    (cond ((memq field-name '(From Resent-From
 147                                              To Resent-To
 148                                              Cc Resent-Cc
 149                                              Bcc Resent-Bcc
 150                                              Reply-To Resent-Reply-To))
 151                           (setq field (std11-parse-addresses
 152                                        (eword-lexical-analyze field-body)))
 153                           )
 154                          ((memq field-name '(Sender Resent-Sender))
 155                           (setq field (std11-parse-address
 156                                        (eword-lexical-analyze field-body)))
 157                           )
 158                          ((memq field-name eword-decode-ignored-field-list)
 159                           (setq field field-body))
 160                          ((memq field-name eword-decode-structured-field-list)
 161                           (setq field (eword-decode-structured-field-body
 162                                        field-body)))
 163                          (t
 164                           (setq field (eword-decode-unstructured-field-body
 165                                        field-body))
 166                           ))
 167                    (mime-entity-set-parsed-header
 168                     entity (put-alist field-name field header))
 169                    field)))))))
 170
 171
 172 ;;; @ Entity Content
 173 ;;;
 174
 175 (defun mime-entity-content (entity)
 176   (save-excursion
 177     (set-buffer (mime-entity-buffer entity))
 178     (mime-decode-string (buffer-substring (mime-entity-body-start entity)
 179                                           (mime-entity-body-end entity))
 180                         (mime-entity-encoding entity))))
 181
 182
 183 ;;; @ Another Entity Information
 184 ;;;
 185
 186 (defun mime-entity-uu-filename (entity)
 187   (if (member (mime-entity-encoding entity) mime-uuencode-encoding-name-list)
 188       (save-excursion
 189         (set-buffer (mime-entity-buffer entity))
 190         (goto-char (mime-entity-body-start entity))
 191         (if (re-search-forward "^begin [0-9]+ "
 192                                (mime-entity-body-end entity) t)
 193             (if (looking-at ".+$")
 194                 (buffer-substring (match-beginning 0)(match-end 0))
 195               )))))
 196
 197 (defun mime-entity-filename (entity)
 198   "Return filename of ENTITY."
 199   (or (mime-entity-uu-filename entity)
 200       (mime-content-disposition-filename
 201        (mime-entity-content-disposition entity))
 202       (cdr (let ((param (mime-content-type-parameters
 203                          (mime-entity-content-type entity))))
 204              (or (assoc "name" param)
 205                  (assoc "x-name" param))
 206              ))))
 207
 208
 209 ;;; @ end
 210 ;;;
 211
 212 (provide 'mime)
 213
 214 ;;; mime.el ends here