mmbuffer.el

   1 ;;; mmbuffer.el --- MIME entity module for binary buffer
   2
   3 ;; Copyright (C) 1998,1999 Free Software Foundation, Inc.
   4 ;; Copyright (C) 1999 Electrotechnical Laboratory, JAPAN.
   5 ;; Licensed to the Free Software Foundation.
   6
   7 ;; Author: MORIOKA Tomohiko <tomo@m17n.org>
   8 ;; Keywords: MIME, multimedia, mail, news
   9
  10 ;; This file is part of FLIM (Faithful Library about Internet Message).
  11
  12 ;; This program is free software; you can redistribute it and/or
  13 ;; modify it under the terms of the GNU General Public License as
  14 ;; published by the Free Software Foundation; either version 2, or (at
  15 ;; your option) any later version.
  16
  17 ;; This program is distributed in the hope that it will be useful, but
  18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ;; General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Code:
  28
  29 (require 'mime)
  30
  31 (eval-and-compile
  32   (luna-define-class mime-buffer-entity (mime-entity)
  33                      (buffer
  34                       header-start
  35                       header-end
  36                       body-start
  37                       body-end))
  38
  39   (luna-define-internal-accessors 'mime-buffer-entity)
  40   )
  41
  42 (luna-define-method initialize-instance :after ((entity mime-buffer-entity)
  43                                                 &rest init-args)
  44   (mime-buffer-entity-set-buffer-internal
  45    entity (mime-entity-location-internal entity))
  46   (save-excursion
  47     (set-buffer (mime-buffer-entity-buffer-internal entity))
  48     (setq mime-message-structure entity)
  49     (let ((header-start (point-min))
  50           header-end
  51           body-start
  52           (body-end (point-max)))
  53       (goto-char header-start)
  54       (if (re-search-forward "^$" nil t)
  55           (setq header-end (match-end 0)
  56                 body-start (if (= header-end body-end)
  57                                body-end
  58                              (1+ header-end)))
  59         (setq header-end (point-min)
  60               body-start (point-min)))
  61       (save-restriction
  62         (narrow-to-region header-start header-end)
  63         (mime-entity-set-content-type-internal
  64          entity
  65          (let ((str (std11-fetch-field "Content-Type")))
  66            (if str
  67                (mime-parse-Content-Type str)
  68              )))
  69         )
  70       (mime-buffer-entity-set-header-start-internal entity header-start)
  71       (mime-buffer-entity-set-header-end-internal entity header-end)
  72       (mime-buffer-entity-set-body-start-internal entity body-start)
  73       (mime-buffer-entity-set-body-end-internal entity body-end)
  74       ))
  75   entity)
  76
  77 (luna-define-method mime-entity-name ((entity mime-buffer-entity))
  78   (buffer-name (mime-buffer-entity-buffer-internal entity))
  79   )
  80
  81
  82 ;;; @ message parser
  83 ;;;
  84
  85 (defun mime-parse-multipart (entity)
  86   (goto-char (point-min))
  87   (let* ((representation-type
  88           (mime-entity-representation-type-internal entity))
  89          (content-type (mime-entity-content-type-internal entity))
  90          (dash-boundary
  91           (concat "--" (mime-content-type-parameter content-type "boundary")))
  92          (delimiter       (concat "\n" (regexp-quote dash-boundary)))
  93          (close-delimiter (concat delimiter "--[ \t]*$"))
  94          (rsep (concat delimiter "[ \t]*\n"))
  95          (dc-ctl
  96           (if (eq (mime-content-type-subtype content-type) 'digest)
  97               (make-mime-content-type 'message 'rfc822)
  98             (make-mime-content-type 'text 'plain)
  99             ))
 100          (body-start (mime-buffer-entity-body-start-internal entity))
 101          (body-end (mime-buffer-entity-body-end-internal entity)))
 102     (save-restriction
 103       (goto-char body-end)
 104       (narrow-to-region body-start
 105                         (if (re-search-backward close-delimiter nil t)
 106                             (match-beginning 0)
 107                           body-end))
 108       (goto-char body-start)
 109       (if (re-search-forward
 110            (concat "^" (regexp-quote dash-boundary) "[ \t]*\n")
 111            nil t)
 112           (let ((cb (match-end 0))
 113                 ce ncb ret children
 114                 (node-id (mime-entity-node-id-internal entity))
 115                 (i 0))
 116             (while (re-search-forward rsep nil t)
 117               (setq ce (match-beginning 0))
 118               (setq ncb (match-end 0))
 119               (save-restriction
 120                 (narrow-to-region cb ce)
 121                 (setq ret (mime-parse-message representation-type dc-ctl
 122                                               entity (cons i node-id)))
 123                 )
 124               (setq children (cons ret children))
 125               (goto-char (setq cb ncb))
 126               (setq i (1+ i))
 127               )
 128             (setq ce (point-max))
 129             (save-restriction
 130               (narrow-to-region cb ce)
 131               (setq ret (mime-parse-message representation-type dc-ctl
 132                                             entity (cons i node-id)))
 133               )
 134             (setq children (cons ret children))
 135             (mime-entity-set-children-internal entity (nreverse children))
 136             )
 137         (mime-entity-set-content-type-internal
 138          entity (make-mime-content-type 'message 'x-broken))
 139         nil)
 140       )))
 141
 142 (defun mime-parse-encapsulated (entity)
 143   (mime-entity-set-children-internal
 144    entity
 145    (save-restriction
 146      (narrow-to-region (mime-buffer-entity-body-start-internal entity)
 147                        (mime-buffer-entity-body-end-internal entity))
 148      (list (mime-parse-message
 149             (mime-entity-representation-type-internal entity) nil
 150             entity (cons 0 (mime-entity-node-id-internal entity))))
 151      )))
 152
 153 (defun mime-parse-message (representation-type &optional default-ctl
 154                                                parent node-id)
 155   (let ((header-start (point-min))
 156         header-end
 157         body-start
 158         (body-end (point-max))
 159         content-type)
 160     (goto-char header-start)
 161     (if (re-search-forward "^$" nil t)
 162         (setq header-end (match-end 0)
 163               body-start (if (= header-end body-end)
 164                              body-end
 165                            (1+ header-end)))
 166       (setq header-end (point-min)
 167             body-start (point-min)))
 168     (save-restriction
 169       (narrow-to-region header-start header-end)
 170       (setq content-type (or (let ((str (std11-fetch-field "Content-Type")))
 171                                (if str
 172                                    (mime-parse-Content-Type str)
 173                                  ))
 174                              default-ctl))
 175       )
 176     (luna-make-entity representation-type
 177                       :location (current-buffer)
 178                       :content-type content-type
 179                       :parent parent
 180                       :node-id node-id
 181                       :buffer (current-buffer)
 182                       :header-start header-start
 183                       :header-end header-end
 184                       :body-start body-start
 185                       :body-end body-end)
 186     ))
 187
 188 (luna-define-method mime-entity-children ((entity mime-buffer-entity))
 189   (let* ((content-type (mime-entity-content-type entity))
 190          (primary-type (mime-content-type-primary-type content-type)))
 191     (cond ((eq primary-type 'multipart)
 192            (mime-parse-multipart entity)
 193            )
 194           ((and (eq primary-type 'message)
 195                 (memq (mime-content-type-subtype content-type)
 196                       '(rfc822 news external-body)
 197                       ))
 198            (mime-parse-encapsulated entity)
 199            ))
 200     ))
 201
 202
 203 (luna-define-method mime-goto-header-start-point ((entity mime-buffer-entity))
 204   (set-buffer (mime-buffer-entity-buffer-internal entity))
 205   (goto-char (mime-buffer-entity-header-start-internal entity))
 206   )
 207
 208 (defun mime-visible-field-p (field-name visible-fields invisible-fields)
 209   (or (catch 'found
 210         (while visible-fields
 211           (let ((regexp (car visible-fields)))
 212             (if (string-match regexp field-name)
 213                 (throw 'found t)
 214               ))
 215           (setq visible-fields (cdr visible-fields))
 216           ))
 217       (catch 'found
 218         (while invisible-fields
 219           (let ((regexp (car invisible-fields)))
 220             (if (string-match regexp field-name)
 221                 (throw 'found nil)
 222               ))
 223           (setq invisible-fields (cdr invisible-fields))
 224           )
 225         t)))
 226
 227 (defun mime-insert-header-from-buffer (buffer start end
 228                                               &optional invisible-fields
 229                                               visible-fields)
 230   (let ((the-buf (current-buffer))
 231         (mode-obj (mime-find-field-presentation-method 'wide))
 232         field-decoder
 233         f-b p f-e field-name len field field-body)
 234     (save-excursion
 235       (set-buffer buffer)
 236       (save-restriction
 237         (narrow-to-region start end)
 238         (goto-char start)
 239         (while (re-search-forward std11-field-head-regexp nil t)
 240           (setq f-b (match-beginning 0)
 241                 p (match-end 0)
 242                 field-name (buffer-substring f-b p)
 243                 len (string-width field-name)
 244                 f-e (std11-field-end))
 245           (when (mime-visible-field-p field-name
 246                                       visible-fields invisible-fields)
 247             (setq field (intern
 248                          (capitalize (buffer-substring f-b (1- p))))
 249                   field-body (buffer-substring p f-e)
 250                   field-decoder (inline (mime-find-field-decoder-internal
 251                                          field mode-obj)))
 252             (with-current-buffer the-buf
 253               (insert field-name)
 254               (insert (if field-decoder
 255                           (funcall field-decoder field-body len)
 256                         ;; Don't decode
 257                         field-body))
 258               (insert "\n")
 259               )))))))
 260
 261 (luna-define-method mime-insert-header ((entity mime-buffer-entity)
 262                                         &optional invisible-fields
 263                                         visible-fields)
 264   (mime-insert-header-from-buffer
 265    (mime-buffer-entity-buffer-internal entity)
 266    (mime-buffer-entity-header-start-internal entity)
 267    (mime-buffer-entity-header-end-internal entity)
 268    invisible-fields visible-fields)
 269   )
 270
 271 (luna-define-method mime-entity-content ((entity mime-buffer-entity))
 272   (save-excursion
 273     (set-buffer (mime-buffer-entity-buffer-internal entity))
 274     (mime-decode-string
 275      (buffer-substring (mime-buffer-entity-body-start-internal entity)
 276                        (mime-buffer-entity-body-end-internal entity))
 277      (mime-entity-encoding entity))))
 278
 279 (luna-define-method mime-insert-text-content ((entity mime-buffer-entity))
 280   (insert
 281    (decode-mime-charset-string (mime-entity-content entity)
 282                                (or (mime-content-type-parameter
 283                                     (mime-entity-content-type entity)
 284                                     "charset")
 285                                    default-mime-charset)
 286                                'CRLF)
 287    ))
 288
 289 ;;; redefine to speed up
 290
 291 (mm-define-method entity-point-min ((entity buffer))
 292   (mime-buffer-entity-header-start-internal entity))
 293
 294 (mm-define-method entity-point-max ((entity buffer))
 295   (mime-buffer-entity-body-end-internal entity))
 296
 297 (luna-define-method mime-entity-fetch-field ((entity mime-buffer-entity)
 298                                              field-name)
 299   (save-excursion
 300     (set-buffer (mime-buffer-entity-buffer-internal entity))
 301     (save-restriction
 302       (narrow-to-region (mime-buffer-entity-header-start-internal entity)
 303                         (mime-buffer-entity-header-end-internal entity))
 304       (std11-fetch-field field-name)
 305       )))
 306
 307 (mm-define-method insert-entity-content ((entity buffer))
 308   (insert (with-current-buffer (mime-buffer-entity-buffer-internal entity)
 309             (mime-decode-string
 310              (buffer-substring (mime-buffer-entity-body-start-internal entity)
 311                                (mime-buffer-entity-body-end-internal entity))
 312              (mime-entity-encoding entity)))))
 313
 314 (mm-define-method write-entity-content ((entity buffer) filename)
 315   (save-excursion
 316     (set-buffer (mime-buffer-entity-buffer-internal entity))
 317     (mime-write-decoded-region (mime-buffer-entity-body-start-internal entity)
 318                                (mime-buffer-entity-body-end-internal entity)
 319                                filename
 320                                (or (mime-entity-encoding entity) "7bit"))
 321     ))
 322
 323 (mm-define-method insert-entity ((entity buffer))
 324   (insert-buffer-substring (mime-buffer-entity-buffer-internal entity)
 325                            (mime-buffer-entity-header-start-internal entity)
 326                            (mime-buffer-entity-body-end-internal entity))
 327   )
 328
 329 (mm-define-method write-entity ((entity buffer) filename)
 330   (save-excursion
 331     (set-buffer (mime-buffer-entity-buffer-internal entity))
 332     (write-region-as-raw-text-CRLF
 333      (mime-buffer-entity-header-start-internal entity)
 334      (mime-buffer-entity-body-end-internal entity)
 335      filename)
 336     ))
 337
 338 (mm-define-method write-entity-body ((entity buffer) filename)
 339   (save-excursion
 340     (set-buffer (mime-buffer-entity-buffer-internal entity))
 341     (write-region-as-binary (mime-buffer-entity-body-start-internal entity)
 342                             (mime-buffer-entity-body-end-internal entity)
 343                             filename)
 344     ))
 345
 346
 347 ;;; @ buffer
 348 ;;;
 349
 350 (luna-define-method mime-entity-header-buffer ((entity mime-buffer-entity))
 351   (mime-buffer-entity-buffer-internal entity)
 352   )
 353
 354 (luna-define-method mime-entity-body-buffer ((entity mime-buffer-entity))
 355   (mime-buffer-entity-buffer-internal entity)
 356   )
 357
 358 (luna-define-method mime-entity-buffer ((entity mime-buffer-entity))
 359   (mime-buffer-entity-buffer-internal entity)
 360   )
 361
 362 (luna-define-method mime-entity-point-min ((entity mime-buffer-entity))
 363   (mime-buffer-entity-header-start-internal entity)
 364   )
 365
 366 (luna-define-method mime-entity-point-max ((entity mime-buffer-entity))
 367   (mime-buffer-entity-body-end-internal entity)
 368   )
 369
 370
 371 ;;; @ utility
 372 ;;;
 373
 374 ;;;###autoload
 375 (defun mime-parse-buffer (&optional buffer representation-type)
 376   "Parse BUFFER as a MIME message.
 377 If buffer is omitted, it parses current-buffer."
 378   (save-excursion
 379     (if buffer (set-buffer buffer))
 380     (setq mime-message-structure
 381           (mime-parse-message (or representation-type 'buffer) nil))
 382     ))
 383
 384
 385 ;;; @ end
 386 ;;;
 387
 388 (provide 'mmbuffer)
 389
 390 ;;; mmbuffer.el ends here