lisp/mm-decode.el

   1 ;;; mm-decode.el --- Functions for decoding MIME things
   2
   3 ;; Copyright (C) 1998-2012 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;;      MORIOKA Tomohiko <morioka@jaist.ac.jp>
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 ;; For Emacs <22.2 and XEmacs.
  27 (eval-and-compile
  28   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  29
  30 (require 'mail-parse)
  31 (require 'mm-bodies)
  32 (eval-when-compile (require 'cl)
  33                    (require 'term))
  34
  35 (autoload 'gnus-map-function "gnus-util")
  36 (autoload 'gnus-replace-in-string "gnus-util")
  37 (autoload 'gnus-read-shell-command "gnus-util")
  38
  39 (autoload 'mm-inline-partial "mm-partial")
  40 (autoload 'mm-inline-external-body "mm-extern")
  41 (autoload 'mm-extern-cache-contents "mm-extern")
  42 (autoload 'mm-insert-inline "mm-view")
  43
  44 (autoload 'mm-archive-decoders "mm-archive")
  45 (autoload 'mm-archive-dissect-and-inline "mm-archive")
  46 (autoload 'mm-dissect-archive "mm-archive")
  47
  48 (defvar gnus-current-window-configuration)
  49
  50 (add-hook 'gnus-exit-gnus-hook 'mm-destroy-postponed-undisplay-list)
  51
  52 (defgroup mime-display ()
  53   "Display of MIME in mail and news articles."
  54   :link '(custom-manual "(emacs-mime)Display Customization")
  55   :version "21.1"
  56   :group 'mail
  57   :group 'news
  58   :group 'multimedia)
  59
  60 (defgroup mime-security ()
  61   "MIME security in mail and news articles."
  62   :link '(custom-manual "(emacs-mime)Display Customization")
  63   :group 'mail
  64   :group 'news
  65   :group 'multimedia)
  66
  67 ;;; Convenience macros.
  68
  69 (defmacro mm-handle-buffer (handle)
  70   `(nth 0 ,handle))
  71 (defmacro mm-handle-type (handle)
  72   `(nth 1 ,handle))
  73 (defsubst mm-handle-media-type (handle)
  74   (if (stringp (car handle))
  75       (car handle)
  76     (car (mm-handle-type handle))))
  77 (defsubst mm-handle-media-supertype (handle)
  78   (car (split-string (mm-handle-media-type handle) "/")))
  79 (defsubst mm-handle-media-subtype (handle)
  80   (cadr (split-string (mm-handle-media-type handle) "/")))
  81 (defmacro mm-handle-encoding (handle)
  82   `(nth 2 ,handle))
  83 (defmacro mm-handle-undisplayer (handle)
  84   `(nth 3 ,handle))
  85 (defmacro mm-handle-set-undisplayer (handle function)
  86   `(setcar (nthcdr 3 ,handle) ,function))
  87 (defmacro mm-handle-disposition (handle)
  88   `(nth 4 ,handle))
  89 (defmacro mm-handle-description (handle)
  90   `(nth 5 ,handle))
  91 (defmacro mm-handle-cache (handle)
  92   `(nth 6 ,handle))
  93 (defmacro mm-handle-set-cache (handle contents)
  94   `(setcar (nthcdr 6 ,handle) ,contents))
  95 (defmacro mm-handle-id (handle)
  96   `(nth 7 ,handle))
  97 (defmacro mm-handle-multipart-original-buffer (handle)
  98   `(get-text-property 0 'buffer (car ,handle)))
  99 (defmacro mm-handle-multipart-from (handle)
 100   `(get-text-property 0 'from (car ,handle)))
 101 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
 102   `(get-text-property 0 ,parameter (car ,handle)))
 103
 104 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
 105                                     disposition description cache
 106                                     id)
 107   `(list ,buffer ,type ,encoding ,undisplayer
 108          ,disposition ,description ,cache ,id))
 109
 110 (defcustom mm-text-html-renderer
 111   (cond ((fboundp 'libxml-parse-html-region) 'shr)
 112         ((executable-find "w3m") 'gnus-w3m)
 113         ((executable-find "links") 'links)
 114         ((executable-find "lynx") 'lynx)
 115         ((locate-library "w3") 'w3)
 116         ((locate-library "html2text") 'html2text)
 117         (t nil))
 118   "Render of HTML contents.
 119 It is one of defined renderer types, or a rendering function.
 120 The defined renderer types are:
 121 `shr': use the built-in Gnus HTML renderer;
 122 `gnus-w3m': use Gnus renderer based on w3m;
 123 `w3m': use emacs-w3m;
 124 `w3m-standalone': use plain w3m;
 125 `links': use links;
 126 `lynx': use lynx;
 127 `w3': use Emacs/W3;
 128 `html2text': use html2text;
 129 nil    : use external viewer (default web browser)."
 130   :version "24.1"
 131   :type '(choice (const shr)
 132                  (const gnus-w3m)
 133                  (const w3)
 134                  (const w3m :tag "emacs-w3m")
 135                  (const w3m-standalone :tag "standalone w3m" )
 136                  (const links)
 137                  (const lynx)
 138                  (const html2text)
 139                  (const nil :tag "External viewer")
 140                  (function))
 141   :group 'mime-display)
 142
 143 (defcustom mm-inline-text-html-with-images nil
 144   "If non-nil, Gnus will allow retrieving images in HTML contents with
 145 the <img> tags.  It has no effect on Emacs/w3.  See also the
 146 documentation for the `mm-w3m-safe-url-regexp' variable."
 147   :version "22.1"
 148   :type 'boolean
 149   :group 'mime-display)
 150
 151 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 152   "Regexp matching URLs which are considered to be safe.
 153 Some HTML mails might contain a nasty trick used by spammers, using
 154 the <img> tag which is far more evil than the [Click Here!] button.
 155 It is most likely intended to check whether the ominous spam mail has
 156 reached your eyes or not, in which case the spammer knows for sure
 157 that your email address is valid.  It is done by embedding an
 158 identifier string into a URL that you might automatically retrieve
 159 when displaying the image.  The default value is \"\\\\`cid:\" which only
 160 matches parts embedded to the Multipart/Related type MIME contents and
 161 Gnus will never connect to the spammer's site arbitrarily.  You may
 162 set this variable to nil if you consider all urls to be safe."
 163   :version "22.1"
 164   :type '(choice (regexp :tag "Regexp")
 165                  (const :tag "All URLs are safe" nil))
 166   :group 'mime-display)
 167
 168 (defcustom mm-inline-text-html-with-w3m-keymap t
 169   "If non-nil, use emacs-w3m command keys in the article buffer."
 170   :version "22.1"
 171   :type 'boolean
 172   :group 'mime-display)
 173
 174 (defcustom mm-enable-external t
 175   "Indicate whether external MIME handlers should be used.
 176
 177 If t, all defined external MIME handlers are used.  If nil, files are saved by
 178 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 179 before the external MIME handler is invoked."
 180   :version "22.1"
 181   :type '(choice (const :tag "Always" t)
 182                  (const :tag "Never" nil)
 183                  (const :tag "Ask" ask))
 184   :group 'mime-display)
 185
 186 (defcustom mm-inline-media-tests
 187   '(("image/p?jpeg"
 188      mm-inline-image
 189      (lambda (handle)
 190        (mm-valid-and-fit-image-p 'jpeg handle)))
 191     ("image/png"
 192      mm-inline-image
 193      (lambda (handle)
 194        (mm-valid-and-fit-image-p 'png handle)))
 195     ("image/gif"
 196      mm-inline-image
 197      (lambda (handle)
 198        (mm-valid-and-fit-image-p 'gif handle)))
 199     ("image/tiff"
 200      mm-inline-image
 201      (lambda (handle)
 202        (mm-valid-and-fit-image-p 'tiff handle)))
 203     ("image/xbm"
 204      mm-inline-image
 205      (lambda (handle)
 206        (mm-valid-and-fit-image-p 'xbm handle)))
 207     ("image/x-xbitmap"
 208      mm-inline-image
 209      (lambda (handle)
 210        (mm-valid-and-fit-image-p 'xbm handle)))
 211     ("image/xpm"
 212      mm-inline-image
 213      (lambda (handle)
 214        (mm-valid-and-fit-image-p 'xpm handle)))
 215     ("image/x-xpixmap"
 216      mm-inline-image
 217      (lambda (handle)
 218        (mm-valid-and-fit-image-p 'xpm handle)))
 219     ("image/bmp"
 220      mm-inline-image
 221      (lambda (handle)
 222        (mm-valid-and-fit-image-p 'bmp handle)))
 223     ("image/x-portable-bitmap"
 224      mm-inline-image
 225      (lambda (handle)
 226        (mm-valid-and-fit-image-p 'pbm handle)))
 227     ("text/plain" mm-inline-text identity)
 228     ("text/enriched" mm-inline-text identity)
 229     ("text/richtext" mm-inline-text identity)
 230     ("text/x-patch" mm-display-patch-inline identity)
 231     ;; In case mime.types uses x-diff (as does Debian's mime-support-3.40).
 232     ("text/x-diff" mm-display-patch-inline identity)
 233     ("application/emacs-lisp" mm-display-elisp-inline identity)
 234     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 235     ("application/x-shellscript" mm-display-shell-script-inline identity)
 236     ("application/x-sh" mm-display-shell-script-inline identity)
 237     ("text/x-sh" mm-display-shell-script-inline identity)
 238     ("application/javascript" mm-display-javascript-inline identity)
 239     ("text/dns" mm-display-dns-inline identity)
 240     ("text/x-org" mm-display-org-inline identity)
 241     ("text/html"
 242      mm-inline-text-html
 243      (lambda (handle)
 244        mm-text-html-renderer))
 245     ("text/x-vcard"
 246      mm-inline-text-vcard
 247      (lambda (handle)
 248        (or (featurep 'vcard)
 249            (locate-library "vcard"))))
 250     ("message/delivery-status" mm-inline-text identity)
 251     ("message/rfc822" mm-inline-message identity)
 252     ("message/partial" mm-inline-partial identity)
 253     ("message/external-body" mm-inline-external-body identity)
 254     ("text/.*" mm-inline-text identity)
 255     ("application/x-.?tar\\(-.*\\)?" mm-archive-dissect-and-inline identity)
 256     ("application/zip" mm-archive-dissect-and-inline identity)
 257     ("audio/wav" mm-inline-audio
 258      (lambda (handle)
 259        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 260             (device-sound-enabled-p))))
 261     ("audio/au"
 262      mm-inline-audio
 263      (lambda (handle)
 264        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 265             (device-sound-enabled-p))))
 266     ("application/pgp-signature" ignore identity)
 267     ("application/x-pkcs7-signature" ignore identity)
 268     ("application/pkcs7-signature" ignore identity)
 269     ("application/x-pkcs7-mime" ignore identity)
 270     ("application/pkcs7-mime" ignore identity)
 271     ("multipart/alternative" ignore identity)
 272     ("multipart/mixed" ignore identity)
 273     ("multipart/related" ignore identity)
 274     ("image/.*"
 275      mm-inline-image
 276      (lambda (handle)
 277        (and (mm-valid-image-format-p 'imagemagick)
 278             (mm-with-unibyte-buffer
 279               (mm-insert-part handle)
 280               (let ((image
 281                      (ignore-errors
 282                        (if (fboundp 'create-image)
 283                            (create-image (buffer-string) 'imagemagick 'data-p)
 284                          (mm-create-image-xemacs
 285                           (mm-handle-media-subtype handle))))))
 286                 (when image
 287                   (setcar (cdr handle) (list "image/imagemagick"))
 288                   (mm-image-fit-p handle)))))))
 289     ;; Disable audio and image
 290     ("audio/.*" ignore ignore)
 291     ("image/.*" ignore ignore)
 292     ;; Default to displaying as text
 293     (".*" mm-inline-text mm-readable-p))
 294   "Alist of media types/tests saying whether types can be displayed inline."
 295   :type '(repeat (list (regexp :tag "MIME type")
 296                        (function :tag "Display function")
 297                        (function :tag "Display test")))
 298   :group 'mime-display)
 299
 300 (defcustom mm-inlined-types
 301   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 302     "message/partial" "message/external-body" "application/emacs-lisp"
 303     "application/x-emacs-lisp"
 304     "application/pgp-signature" "application/x-pkcs7-signature"
 305     "application/pkcs7-signature" "application/x-pkcs7-mime"
 306     "application/pkcs7-mime"
 307     "application/x-gtar-compressed"
 308     "application/x-tar"
 309     "application/zip"
 310     ;; Mutt still uses this even though it has already been withdrawn.
 311     "application/pgp")
 312   "List of media types that are to be displayed inline.
 313 See also `mm-inline-media-tests', which says how to display a media
 314 type inline."
 315   :type '(repeat regexp)
 316   :group 'mime-display)
 317
 318 (defcustom mm-keep-viewer-alive-types
 319   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 320     "application/pdf" "application/x-dvi")
 321   "List of media types for which the external viewer will not be killed
 322 when selecting a different article."
 323   :version "22.1"
 324   :type '(repeat regexp)
 325   :group 'mime-display)
 326
 327 (defcustom mm-automatic-display
 328   '("text/plain" "text/enriched" "text/richtext" "text/html" "text/x-verbatim"
 329     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 330     "message/rfc822" "text/x-patch" "text/dns" "application/pgp-signature"
 331     "application/emacs-lisp" "application/x-emacs-lisp"
 332     "application/x-pkcs7-signature"
 333     "application/pkcs7-signature" "application/x-pkcs7-mime"
 334     "application/pkcs7-mime"
 335     ;; Mutt still uses this even though it has already been withdrawn.
 336     "application/pgp\\'"
 337      "text/x-org")
 338   "A list of MIME types to be displayed automatically."
 339   :type '(repeat regexp)
 340   :group 'mime-display)
 341
 342 (defcustom mm-attachment-override-types '("text/x-vcard"
 343                                           "application/pkcs7-mime"
 344                                           "application/x-pkcs7-mime"
 345                                           "application/pkcs7-signature"
 346                                           "application/x-pkcs7-signature")
 347   "Types to have \"attachment\" ignored if they can be displayed inline."
 348   :type '(repeat regexp)
 349   :group 'mime-display)
 350
 351 (defcustom mm-inline-override-types nil
 352   "Types to be treated as attachments even if they can be displayed inline."
 353   :type '(repeat regexp)
 354   :group 'mime-display)
 355
 356 (defcustom mm-automatic-external-display nil
 357   "List of MIME type regexps that will be displayed externally automatically."
 358   :type '(repeat regexp)
 359   :group 'mime-display)
 360
 361 (defcustom mm-discouraged-alternatives nil
 362   "List of MIME types that are discouraged when viewing multipart/alternative.
 363 Viewing agents are supposed to view the last possible part of a message,
 364 as that is supposed to be the richest.  However, users may prefer other
 365 types instead, and this list says what types are most unwanted.  If,
 366 for instance, text/html parts are very unwanted, and text/richtext are
 367 somewhat unwanted, then the value of this variable should be set
 368 to:
 369
 370  (\"text/html\" \"text/richtext\")
 371
 372 Adding \"image/.*\" might also be useful.  Spammers use it as the
 373 preferred part of multipart/alternative messages.  See also
 374 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 375 enables you to choose manually one of two types those mails include."
 376   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 377   :group 'mime-display)
 378
 379 (defcustom mm-tmp-directory
 380   (if (fboundp 'temp-directory)
 381       (temp-directory)
 382     (if (boundp 'temporary-file-directory)
 383         temporary-file-directory
 384       "/tmp/"))
 385   "Where mm will store its temporary files."
 386   :type 'directory
 387   :group 'mime-display)
 388
 389 (defcustom mm-inline-large-images nil
 390   "If t, then all images fit in the buffer.
 391 If 'resize, try to resize the images so they fit."
 392   :type '(radio
 393           (const :tag "Inline large images as they are." t)
 394           (const :tag "Resize large images." resize)
 395           (const :tag "Do not inline large images." nil))
 396   :group 'mime-display)
 397
 398 (defcustom mm-file-name-rewrite-functions
 399   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 400   "List of functions used for rewriting file names of MIME parts.
 401 Each function takes a file name as input and returns a file name.
 402
 403 Ready-made functions include `mm-file-name-delete-control',
 404 `mm-file-name-delete-gotchas' (you should not remove these two
 405 functions), `mm-file-name-delete-whitespace',
 406 `mm-file-name-trim-whitespace', `mm-file-name-collapse-whitespace',
 407 `mm-file-name-replace-whitespace', `capitalize', `downcase',
 408 `upcase', and `upcase-initials'."
 409   :type '(list (set :inline t
 410                     (const mm-file-name-delete-control)
 411                     (const mm-file-name-delete-gotchas)
 412                     (const mm-file-name-delete-whitespace)
 413                     (const mm-file-name-trim-whitespace)
 414                     (const mm-file-name-collapse-whitespace)
 415                     (const mm-file-name-replace-whitespace)
 416                     (const capitalize)
 417                     (const downcase)
 418                     (const upcase)
 419                     (const upcase-initials)
 420                (repeat :inline t
 421                        :tag "Function"
 422                        function)))
 423   :version "23.1" ;; No Gnus
 424   :group 'mime-display)
 425
 426
 427 (defvar mm-path-name-rewrite-functions nil
 428   "*List of functions for rewriting the full file names of MIME parts.
 429 This is used when viewing parts externally, and is meant for
 430 transforming the absolute name so that non-compliant programs can find
 431 the file where it's saved.
 432
 433 Each function takes a file name as input and returns a file name.")
 434
 435 (defvar mm-file-name-replace-whitespace nil
 436   "String used for replacing whitespace characters; default is `\"_\"'.")
 437
 438 (defcustom mm-default-directory nil
 439   "The default directory where mm will save files.
 440 If not set, `default-directory' will be used."
 441   :type '(choice directory (const :tag "Default" nil))
 442   :group 'mime-display)
 443
 444 (defcustom mm-attachment-file-modes 384
 445   "Set the mode bits of saved attachments to this integer."
 446   :version "22.1"
 447   :type 'integer
 448   :group 'mime-display)
 449
 450 (defcustom mm-external-terminal-program "xterm"
 451   "The program to start an external terminal."
 452   :version "22.1"
 453   :type 'string
 454   :group 'mime-display)
 455
 456 ;;; Internal variables.
 457
 458 (defvar mm-last-shell-command "")
 459 (defvar mm-content-id-alist nil)
 460 (defvar mm-postponed-undisplay-list nil)
 461
 462 ;; According to RFC2046, in particular, in a digest, the default
 463 ;; Content-Type value for a body part is changed from "text/plain" to
 464 ;; "message/rfc822".
 465 (defvar mm-dissect-default-type "text/plain")
 466
 467 (autoload 'mml2015-verify "mml2015")
 468 (autoload 'mml2015-verify-test "mml2015")
 469 (autoload 'mml-smime-verify "mml-smime")
 470 (autoload 'mml-smime-verify-test "mml-smime")
 471
 472 (defvar mm-verify-function-alist
 473   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 474     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 475      mm-uu-pgp-signed-test)
 476     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 477      mml-smime-verify-test)
 478     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 479      mml-smime-verify-test)))
 480
 481 (defcustom mm-verify-option 'never
 482   "Option of verifying signed parts.
 483 `never', not verify; `always', always verify;
 484 `known', only verify known protocols.  Otherwise, ask user.
 485
 486 When set to `always' or `known', you should add
 487 \"multipart/signed\" to `gnus-buttonized-mime-types' to see
 488 result of the verification."
 489   :version "22.1"
 490   :type '(choice (item always)
 491                  (item never)
 492                  (item :tag "only known protocols" known)
 493                  (item :tag "ask" nil))
 494   :group 'mime-security)
 495
 496 (autoload 'mml2015-decrypt "mml2015")
 497 (autoload 'mml2015-decrypt-test "mml2015")
 498
 499 (defvar mm-decrypt-function-alist
 500   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 501     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 502      mm-uu-pgp-encrypted-test)))
 503
 504 (defcustom mm-decrypt-option nil
 505   "Option of decrypting encrypted parts.
 506 `never', not decrypt; `always', always decrypt;
 507 `known', only decrypt known protocols.  Otherwise, ask user."
 508   :version "22.1"
 509   :type '(choice (item always)
 510                  (item never)
 511                  (item :tag "only known protocols" known)
 512                  (item :tag "ask" nil))
 513   :group 'mime-security)
 514
 515 (defvar mm-viewer-completion-map
 516   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 517     (set-keymap-parent map minibuffer-local-completion-map)
 518     ;; Should we bind other key to minibuffer-complete-word?
 519     (define-key map " " 'self-insert-command)
 520     map)
 521   "Keymap for input viewer with completion.")
 522
 523 (defvar mm-viewer-completion-map
 524   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 525     (set-keymap-parent map minibuffer-local-completion-map)
 526     ;; Should we bind other key to minibuffer-complete-word?
 527     (define-key map " " 'self-insert-command)
 528     map)
 529   "Keymap for input viewer with completion.")
 530
 531 ;;; The functions.
 532
 533 (defun mm-alist-to-plist (alist)
 534   "Convert association list ALIST into the equivalent property-list form.
 535 The plist is returned.  This converts from
 536
 537 \((a . 1) (b . 2) (c . 3))
 538
 539 into
 540
 541 \(a 1 b 2 c 3)
 542
 543 The original alist is not modified.  See also `destructive-alist-to-plist'."
 544   (let (plist)
 545     (while alist
 546       (let ((el (car alist)))
 547         (setq plist (cons (cdr el) (cons (car el) plist))))
 548       (setq alist (cdr alist)))
 549     (nreverse plist)))
 550
 551 (defun mm-keep-viewer-alive-p (handle)
 552   "Say whether external viewer for HANDLE should stay alive."
 553   (let ((types mm-keep-viewer-alive-types)
 554         (type (mm-handle-media-type handle))
 555         ty)
 556     (catch 'found
 557       (while (setq ty (pop types))
 558         (when (string-match ty type)
 559           (throw 'found t))))))
 560
 561 (defun mm-handle-set-external-undisplayer (handle function)
 562   "Set the undisplayer for HANDLE to FUNCTION.
 563 Postpone undisplaying of viewers for types in
 564 `mm-keep-viewer-alive-types'."
 565   (if (mm-keep-viewer-alive-p handle)
 566       (let ((new-handle (copy-sequence handle)))
 567         (mm-handle-set-undisplayer new-handle function)
 568         (mm-handle-set-undisplayer handle nil)
 569         (push new-handle mm-postponed-undisplay-list))
 570     (mm-handle-set-undisplayer handle function)))
 571
 572 (defun mm-destroy-postponed-undisplay-list ()
 573   (when mm-postponed-undisplay-list
 574     (message "Destroying external MIME viewers")
 575     (mm-destroy-parts mm-postponed-undisplay-list)))
 576
 577 (autoload 'message-fetch-field "message")
 578
 579 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 580   "Dissect the current buffer and return a list of MIME handles.
 581 If NO-STRICT-MIME, don't require the message to have a
 582 MIME-Version header before proceeding."
 583   (save-excursion
 584     (let (ct ctl type subtype cte cd description id result)
 585       (save-restriction
 586         (mail-narrow-to-head)
 587         (when (or no-strict-mime
 588                   loose-mime
 589                   (mail-fetch-field "mime-version"))
 590           (setq ct (mail-fetch-field "content-type")
 591                 ctl (and ct (mail-header-parse-content-type ct))
 592                 cte (mail-fetch-field "content-transfer-encoding")
 593                 cd (or (mail-fetch-field "content-disposition")
 594                        (when (and ctl
 595                                   (eq 'mm-inline-text
 596                                       (cadr (mm-assoc-string-match
 597                                              mm-inline-media-tests
 598                                              (car ctl)))))
 599                          "inline"))
 600                 ;; Newlines in description should be stripped so as
 601                 ;; not to break the MIME tag into two or more lines.
 602                 description (message-fetch-field "content-description")
 603                 id (mail-fetch-field "content-id"))
 604           (unless from
 605             (setq from (mail-fetch-field "from")))
 606           ;; FIXME: In some circumstances, this code is running within
 607           ;; an unibyte macro.  mail-extract-address-components
 608           ;; creates unibyte buffers. This `if', though not a perfect
 609           ;; solution, avoids most of them.
 610           (if from
 611               (setq from (cadr (mail-extract-address-components from))))
 612           (if description
 613               (setq description (mail-decode-encoded-word-string
 614                                  description)))))
 615       (if (or (not ctl)
 616               (not (string-match "/" (car ctl))))
 617           (mm-dissect-singlepart
 618            (list mm-dissect-default-type)
 619            (and cte (intern (downcase (mail-header-strip cte))))
 620            no-strict-mime
 621            (and cd (mail-header-parse-content-disposition cd))
 622            description)
 623         (setq type (split-string (car ctl) "/"))
 624         (setq subtype (cadr type)
 625               type (car type))
 626         (setq
 627          result
 628          (cond
 629           ((equal type "multipart")
 630            (let ((mm-dissect-default-type (if (equal subtype "digest")
 631                                               "message/rfc822"
 632                                             "text/plain"))
 633                  (start (cdr (assq 'start (cdr ctl)))))
 634              (add-text-properties 0 (length (car ctl))
 635                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 636
 637              ;; what really needs to be done here is a way to link a
 638              ;; MIME handle back to it's parent MIME handle (in a multilevel
 639              ;; MIME article).  That would probably require changing
 640              ;; the mm-handle API so we simply store the multipart buffer
 641              ;; name as a text property of the "multipart/whatever" string.
 642              (add-text-properties 0 (length (car ctl))
 643                                   (list 'buffer (mm-copy-to-buffer)
 644                                         'from from
 645                                         'start start)
 646                                   (car ctl))
 647              (cons (car ctl) (mm-dissect-multipart ctl from))))
 648           (t
 649            (mm-possibly-verify-or-decrypt
 650             (mm-dissect-singlepart
 651              ctl
 652              (and cte (intern (downcase (mail-header-strip cte))))
 653              no-strict-mime
 654              (and cd (mail-header-parse-content-disposition cd))
 655              description id)
 656             ctl from))))
 657         (when id
 658           (when (string-match " *<\\(.*\\)> *" id)
 659             (setq id (match-string 1 id)))
 660           (push (cons id result) mm-content-id-alist))
 661         result))))
 662
 663 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 664   (when (or force
 665             (if (equal "text/plain" (car ctl))
 666                 (assoc 'format ctl)
 667               t))
 668     ;; Guess what the type of application/octet-stream parts should
 669     ;; really be.
 670     (let ((filename (cdr (assq 'filename (cdr cdl)))))
 671       (when (and (equal (car ctl) "application/octet-stream")
 672                  filename
 673                  (string-match "\\.\\([^.]+\\)$" filename))
 674         (let ((new-type (mailcap-extension-to-mime (match-string 1 filename))))
 675           (when new-type
 676             (setcar ctl new-type)))))
 677     (let ((handle
 678            (mm-make-handle
 679             (mm-copy-to-buffer) ctl cte nil cdl description nil id))
 680           (decoder (assoc (car ctl) (mm-archive-decoders))))
 681       (if (and decoder
 682                ;; Do automatic decoding
 683                (cadr decoder)
 684                (executable-find (caddr decoder)))
 685           (mm-dissect-archive handle)
 686         handle))))
 687
 688 (defun mm-dissect-multipart (ctl from)
 689   (goto-char (point-min))
 690   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 691          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 692          start parts
 693          (end (save-excursion
 694                 (goto-char (point-max))
 695                 (if (re-search-backward close-delimiter nil t)
 696                     (match-beginning 0)
 697                   (point-max)))))
 698     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 699     (while (and (< (point) end) (re-search-forward boundary end t))
 700       (goto-char (match-beginning 0))
 701       (when start
 702         (save-excursion
 703           (save-restriction
 704             (narrow-to-region start (point))
 705             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 706       (end-of-line 2)
 707       (or (looking-at boundary)
 708           (forward-line 1))
 709       (setq start (point)))
 710     (when (and start (< start end))
 711       (save-excursion
 712         (save-restriction
 713           (narrow-to-region start end)
 714           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 715     (mm-possibly-verify-or-decrypt (nreverse parts) ctl from)))
 716
 717 (defun mm-copy-to-buffer ()
 718   "Copy the contents of the current buffer to a fresh buffer."
 719   (let ((obuf (current-buffer))
 720         (mb (mm-multibyte-p))
 721         beg)
 722     (goto-char (point-min))
 723     (search-forward-regexp "^\n" nil t)
 724     (setq beg (point))
 725     (with-current-buffer
 726           (generate-new-buffer " *mm*")
 727       ;; Preserve the data's unibyteness (for url-insert-file-contents).
 728       (mm-set-buffer-multibyte mb)
 729       (insert-buffer-substring obuf beg)
 730       (current-buffer))))
 731
 732 (defun mm-display-parts (handle &optional no-default)
 733   (if (stringp (car handle))
 734       (mapcar 'mm-display-parts (cdr handle))
 735     (if (bufferp (car handle))
 736         (save-restriction
 737           (narrow-to-region (point) (point))
 738           (mm-display-part handle)
 739           (goto-char (point-max)))
 740       (mapcar 'mm-display-parts handle))))
 741
 742 (autoload 'mailcap-parse-mailcaps "mailcap")
 743 (autoload 'mailcap-mime-info "mailcap")
 744
 745 (defun mm-display-part (handle &optional no-default force)
 746   "Display the MIME part represented by HANDLE.
 747 Returns nil if the part is removed; inline if displayed inline;
 748 external if displayed external."
 749   (save-excursion
 750     (mailcap-parse-mailcaps)
 751     (if (and (not force)
 752              (mm-handle-displayed-p handle))
 753         (mm-remove-part handle)
 754       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 755                                  "message/external-body")
 756                           (progn
 757                             (unless (mm-handle-cache handle)
 758                               (mm-extern-cache-contents handle))
 759                             (mm-handle-cache handle))
 760                         handle))
 761              (type (mm-handle-media-type ehandle))
 762              (method (mailcap-mime-info type))
 763              (filename (or (mail-content-type-get
 764                             (mm-handle-disposition handle) 'filename)
 765                            (mail-content-type-get
 766                             (mm-handle-type handle) 'name)
 767                            "<file>"))
 768              (external mm-enable-external))
 769         (if (and (mm-inlinable-p ehandle)
 770                  (mm-inlined-p ehandle))
 771             (progn
 772               (forward-line 1)
 773               (mm-display-inline handle)
 774               'inline)
 775           (when (or method
 776                     (not no-default))
 777             (if (and (not method)
 778                      (equal "text" (car (split-string type "/"))))
 779                 (progn
 780                   (forward-line 1)
 781                   (mm-insert-inline handle (mm-get-part handle))
 782                   'inline)
 783               (setq external
 784                     (and method ;; If nil, we always use "save".
 785                        (stringp method) ;; 'mailcap-save-binary-file
 786                        (or (eq mm-enable-external t)
 787                            (and (eq mm-enable-external 'ask)
 788                                 (y-or-n-p
 789                                  (concat
 790                                   "Display part (" type
 791                                   ") using external program"
 792                                   ;; Can non-string method ever happen?
 793                                   (if (stringp method)
 794                                       (concat
 795                                        " \"" (format method filename) "\"")
 796                                     "")
 797                                     "? "))))))
 798               (if external
 799                   (mm-display-external
 800                    handle (or method 'mailcap-save-binary-file))
 801                 (mm-display-external
 802                  handle 'mailcap-save-binary-file)))))))))
 803
 804 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
 805 (defvar mailcap-mime-extensions)        ; mailcap-mime-info autoloads
 806
 807 (defun mm-display-external (handle method)
 808   "Display HANDLE using METHOD."
 809   (let ((outbuf (current-buffer)))
 810     (mm-with-unibyte-buffer
 811       (if (functionp method)
 812           (let ((cur (current-buffer)))
 813             (if (eq method 'mailcap-save-binary-file)
 814                 (progn
 815                   (set-buffer (generate-new-buffer " *mm*"))
 816                   (setq method nil))
 817               (mm-insert-part handle)
 818               (mm-add-meta-html-tag handle)
 819               (let ((win (get-buffer-window cur t)))
 820                 (when win
 821                   (select-window win)))
 822               (switch-to-buffer (generate-new-buffer " *mm*")))
 823             (buffer-disable-undo)
 824             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 825             (insert-buffer-substring cur)
 826             (goto-char (point-min))
 827             (when method
 828               (message "Viewing with %s" method))
 829             (let ((mm (current-buffer))
 830                   (non-viewer (assq 'non-viewer
 831                                     (mailcap-mime-info
 832                                      (mm-handle-media-type handle) t))))
 833               (unwind-protect
 834                   (if method
 835                       (funcall method)
 836                     (mm-save-part handle))
 837                 (when (and (not non-viewer)
 838                            method)
 839                   (mm-handle-set-undisplayer handle mm)))))
 840         ;; The function is a string to be executed.
 841         (mm-insert-part handle)
 842         (mm-add-meta-html-tag handle)
 843         (let* ((dir (mm-make-temp-file
 844                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 845                (filename (or
 846                           (mail-content-type-get
 847                            (mm-handle-disposition handle) 'filename)
 848                           (mail-content-type-get
 849                            (mm-handle-type handle) 'name)))
 850                (mime-info (mailcap-mime-info
 851                            (mm-handle-media-type handle) t))
 852                (needsterm (or (assoc "needsterm" mime-info)
 853                               (assoc "needsterminal" mime-info)))
 854                (copiousoutput (assoc "copiousoutput" mime-info))
 855                file buffer)
 856           ;; We create a private sub-directory where we store our files.
 857           (set-file-modes dir #o700)
 858           (if filename
 859               (setq file (expand-file-name
 860                           (gnus-map-function mm-file-name-rewrite-functions
 861                                              (file-name-nondirectory filename))
 862                           dir))
 863             ;; Use nametemplate (defined in RFC1524) if it is specified
 864             ;; in mailcap.
 865             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 866               (if (and suffix
 867                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 868                   (setq suffix (match-string 1 suffix))
 869                 ;; Otherwise, use a suffix according to
 870                 ;; `mailcap-mime-extensions'.
 871                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 872                                           mailcap-mime-extensions))))
 873               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 874                                             nil suffix))))
 875           (let ((coding-system-for-write mm-binary-coding-system))
 876             (write-region (point-min) (point-max) file nil 'nomesg))
 877           ;; The file is deleted after the viewer exists.  If the users edits
 878           ;; the file, changes will be lost.  Set file to read-only to make it
 879           ;; clear.
 880           (set-file-modes file #o400)
 881           (message "Viewing with %s" method)
 882           (cond
 883            (needsterm
 884             (let ((command (mm-mailcap-command
 885                             method file (mm-handle-type handle))))
 886               (unwind-protect
 887                   (if window-system
 888                       (start-process "*display*" nil
 889                                      mm-external-terminal-program
 890                                      "-e" shell-file-name
 891                                      shell-command-switch command)
 892                     (require 'term)
 893                     (require 'gnus-win)
 894                     (set-buffer
 895                      (setq buffer
 896                            (make-term "display"
 897                                       shell-file-name
 898                                       nil
 899                                       shell-command-switch command)))
 900                     (term-mode)
 901                     (term-char-mode)
 902                     (set-process-sentinel
 903                      (get-buffer-process buffer)
 904                      `(lambda (process state)
 905                         (if (eq 'exit (process-status process))
 906                             (gnus-configure-windows
 907                              ',gnus-current-window-configuration))))
 908                     (gnus-configure-windows 'display-term))
 909                 (mm-handle-set-external-undisplayer handle (cons file buffer)))
 910               (message "Displaying %s..." command))
 911             'external)
 912            (copiousoutput
 913             (with-current-buffer outbuf
 914               (forward-line 1)
 915               (mm-insert-inline
 916                handle
 917                (unwind-protect
 918                    (progn
 919                      (call-process shell-file-name nil
 920                                    (setq buffer
 921                                          (generate-new-buffer " *mm*"))
 922                                    nil
 923                                    shell-command-switch
 924                                    (mm-mailcap-command
 925                                     method file (mm-handle-type handle)))
 926                      (if (buffer-live-p buffer)
 927                          (with-current-buffer buffer
 928                            (buffer-string))))
 929                  (progn
 930                    (ignore-errors (delete-file file))
 931                    (ignore-errors (delete-directory
 932                                    (file-name-directory file)))
 933                    (ignore-errors (kill-buffer buffer))))))
 934             'inline)
 935            (t
 936             ;; Deleting the temp file should be postponed for some wrappers,
 937             ;; shell scripts, and so on, which might exit right after having
 938             ;; started a viewer command as a background job.
 939             (let ((command (mm-mailcap-command
 940                             method file (mm-handle-type handle))))
 941               (unwind-protect
 942                   (progn
 943                     (start-process "*display*"
 944                                    (setq buffer
 945                                          (generate-new-buffer " *mm*"))
 946                                    shell-file-name
 947                                    shell-command-switch command)
 948                     (set-process-sentinel
 949                      (get-buffer-process buffer)
 950                      (lexical-let ((outbuf outbuf)
 951                                    (file file)
 952                                    (buffer buffer)
 953                                    (command command)
 954                                    (handle handle))
 955                        (run-at-time
 956                         30.0 nil
 957                         (lambda ()
 958                           (ignore-errors
 959                             (delete-file file))
 960                           (ignore-errors
 961                             (delete-directory (file-name-directory file)))))
 962                        (lambda (process state)
 963                          (when (eq (process-status process) 'exit)
 964                            (condition-case nil
 965                                (delete-file file)
 966                              (error))
 967                            (condition-case nil
 968                                (delete-directory (file-name-directory file))
 969                              (error))
 970                            (when (buffer-live-p outbuf)
 971                              (with-current-buffer outbuf
 972                                (let ((buffer-read-only nil)
 973                                      (point (point)))
 974                                  (forward-line 2)
 975                                  (mm-insert-inline
 976                                   handle (with-current-buffer buffer
 977                                            (buffer-string)))
 978                                  (goto-char point))))
 979                            (when (buffer-live-p buffer)
 980                              (kill-buffer buffer)))
 981                          (message "Displaying %s...done" command)))))
 982                 (mm-handle-set-external-undisplayer
 983                  handle (cons file buffer)))
 984               (message "Displaying %s..." command))
 985             'external)))))))
 986
 987 (defun mm-mailcap-command (method file type-list)
 988   (let ((ctl (cdr type-list))
 989         (beg 0)
 990         (uses-stdin t)
 991         out sub total)
 992     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
 993                          method beg)
 994       (push (substring method beg (match-beginning 0)) out)
 995       (setq beg (match-end 0)
 996             total (match-string 0 method)
 997             sub (match-string 1 method))
 998       (cond
 999        ((string= total "%%")
1000         (push "%" out))
1001        ((or (string= total "%s")
1002             ;; We do our own quoting.
1003             (string= total "'%s'")
1004             (string= total "\"%s\""))
1005         (setq uses-stdin nil)
1006         (push (shell-quote-argument
1007                (gnus-map-function mm-path-name-rewrite-functions file)) out))
1008        ((string= total "%t")
1009         (push (shell-quote-argument (car type-list)) out))
1010        (t
1011         (push (shell-quote-argument (or (cdr (assq (intern sub) ctl)) "")) out))))
1012     (push (substring method beg (length method)) out)
1013     (when uses-stdin
1014       (push "<" out)
1015       (push (shell-quote-argument
1016              (gnus-map-function mm-path-name-rewrite-functions file))
1017             out))
1018     (mapconcat 'identity (nreverse out) "")))
1019
1020 (defun mm-remove-parts (handles)
1021   "Remove the displayed MIME parts represented by HANDLES."
1022   (if (and (listp handles)
1023            (bufferp (car handles)))
1024       (mm-remove-part handles)
1025     (let (handle)
1026       (while (setq handle (pop handles))
1027         (cond
1028          ((stringp handle)
1029           (when (buffer-live-p (get-text-property 0 'buffer handle))
1030             (kill-buffer (get-text-property 0 'buffer handle))))
1031          ((and (listp handle)
1032                (stringp (car handle)))
1033           (mm-remove-parts (cdr handle)))
1034          (t
1035           (mm-remove-part handle)))))))
1036
1037 (defun mm-destroy-parts (handles)
1038   "Remove the displayed MIME parts represented by HANDLES."
1039   (if (and (listp handles)
1040            (bufferp (car handles)))
1041       (mm-destroy-part handles)
1042     (let (handle)
1043       (while (setq handle (pop handles))
1044         (cond
1045          ((stringp handle)
1046           (when (buffer-live-p (get-text-property 0 'buffer handle))
1047             (kill-buffer (get-text-property 0 'buffer handle))))
1048          ((and (listp handle)
1049                (stringp (car handle)))
1050           (mm-destroy-parts handle))
1051          (t
1052           (mm-destroy-part handle)))))))
1053
1054 (defun mm-remove-part (handle)
1055   "Remove the displayed MIME part represented by HANDLE."
1056   (when (listp handle)
1057     (let ((object (mm-handle-undisplayer handle)))
1058       (ignore-errors
1059         (cond
1060          ;; Internally displayed part.
1061          ((mm-annotationp object)
1062           (if (featurep 'xemacs)
1063               (delete-annotation object)))
1064          ((or (functionp object)
1065               (and (listp object)
1066                    (eq (car object) 'lambda)))
1067           (funcall object))
1068          ;; Externally displayed part.
1069          ((consp object)
1070           (condition-case ()
1071               (while (get-buffer-process (cdr object))
1072                 (interrupt-process (get-buffer-process (cdr object)))
1073                 (message "Waiting for external displayer to die...")
1074                 (sit-for 1))
1075             (quit)
1076             (error))
1077           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
1078           (message "Waiting for external displayer to die...done")
1079           (ignore-errors (delete-file (car object)))
1080           (ignore-errors (delete-directory (file-name-directory
1081                                             (car object)))))
1082          ((bufferp object)
1083           (when (buffer-live-p object)
1084             (kill-buffer object)))))
1085       (mm-handle-set-undisplayer handle nil))))
1086
1087 (defun mm-display-inline (handle)
1088   (let* ((type (mm-handle-media-type handle))
1089          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1090     (funcall function handle)
1091     (goto-char (point-min))))
1092
1093 (defun mm-assoc-string-match (alist type)
1094   (dolist (elem alist)
1095     (when (string-match (car elem) type)
1096       (return elem))))
1097
1098 (defun mm-automatic-display-p (handle)
1099   "Say whether the user wants HANDLE to be displayed automatically."
1100   (let ((methods mm-automatic-display)
1101         (type (mm-handle-media-type handle))
1102         method result)
1103     (while (setq method (pop methods))
1104       (when (and (not (mm-inline-override-p handle))
1105                  (string-match method type))
1106         (setq result t
1107               methods nil)))
1108     result))
1109
1110 (defun mm-inlinable-p (handle &optional type)
1111   "Say whether HANDLE can be displayed inline.
1112 TYPE is the mime-type of the object; it defaults to the one given
1113 in HANDLE."
1114   (unless type (setq type (mm-handle-media-type handle)))
1115   (let ((alist mm-inline-media-tests)
1116         test)
1117     (while alist
1118       (when (string-match (caar alist) type)
1119         (setq test (caddar alist)
1120               alist nil)
1121         (setq test (funcall test handle)))
1122       (pop alist))
1123     test))
1124
1125 (defun mm-inlined-p (handle)
1126   "Say whether the user wants HANDLE to be displayed inline."
1127   (let ((methods mm-inlined-types)
1128         (type (mm-handle-media-type handle))
1129         method result)
1130     (while (setq method (pop methods))
1131       (when (and (not (mm-inline-override-p handle))
1132                  (string-match method type))
1133         (setq result t
1134               methods nil)))
1135     result))
1136
1137 (defun mm-attachment-override-p (handle)
1138   "Say whether HANDLE should have attachment behavior overridden."
1139   (let ((types mm-attachment-override-types)
1140         (type (mm-handle-media-type handle))
1141         ty)
1142     (catch 'found
1143       (while (setq ty (pop types))
1144         (when (and (string-match ty type)
1145                    (mm-inlinable-p handle))
1146           (throw 'found t))))))
1147
1148 (defun mm-inline-override-p (handle)
1149   "Say whether HANDLE should have inline behavior overridden."
1150   (let ((types mm-inline-override-types)
1151         (type (mm-handle-media-type handle))
1152         ty)
1153     (catch 'found
1154       (while (setq ty (pop types))
1155         (when (string-match ty type)
1156           (throw 'found t))))))
1157
1158 (defun mm-automatic-external-display-p (type)
1159   "Return the user-defined method for TYPE."
1160   (let ((methods mm-automatic-external-display)
1161         method result)
1162     (while (setq method (pop methods))
1163       (when (string-match method type)
1164         (setq result t
1165               methods nil)))
1166     result))
1167
1168 (defun mm-destroy-part (handle)
1169   "Destroy the data structures connected to HANDLE."
1170   (when (listp handle)
1171     (mm-remove-part handle)
1172     (when (buffer-live-p (mm-handle-buffer handle))
1173       (kill-buffer (mm-handle-buffer handle)))))
1174
1175 (defun mm-handle-displayed-p (handle)
1176   "Say whether HANDLE is displayed or not."
1177   (mm-handle-undisplayer handle))
1178
1179 ;;;
1180 ;;; Functions for outputting parts
1181 ;;;
1182
1183 (defmacro mm-with-part (handle &rest forms)
1184   "Run FORMS in the temp buffer containing the contents of HANDLE."
1185   ;; The handle-buffer's content is a sequence of bytes, not a sequence of
1186   ;; chars, so the buffer should be unibyte.  It may happen that the
1187   ;; handle-buffer is multibyte for some reason, in which case now is a good
1188   ;; time to adjust it, since we know at this point that it should
1189   ;; be unibyte.
1190   `(let* ((handle ,handle))
1191      (when (and (mm-handle-buffer handle)
1192                 (buffer-name (mm-handle-buffer handle)))
1193        (with-temp-buffer
1194          (mm-disable-multibyte)
1195          (insert-buffer-substring (mm-handle-buffer handle))
1196          (mm-decode-content-transfer-encoding
1197           (mm-handle-encoding handle)
1198           (mm-handle-media-type handle))
1199          ,@forms))))
1200 (put 'mm-with-part 'lisp-indent-function 1)
1201 (put 'mm-with-part 'edebug-form-spec '(body))
1202
1203 (defun mm-get-part (handle &optional no-cache)
1204   "Return the contents of HANDLE as a string.
1205 If NO-CACHE is non-nil, cached contents of a message/external-body part
1206 are ignored."
1207   (if (and (not no-cache)
1208            (equal (mm-handle-media-type handle) "message/external-body"))
1209       (progn
1210         (unless (mm-handle-cache handle)
1211           (mm-extern-cache-contents handle))
1212         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1213           (buffer-string)))
1214     (mm-with-part handle
1215       (buffer-string))))
1216
1217 (defun mm-insert-part (handle &optional no-cache)
1218   "Insert the contents of HANDLE in the current buffer.
1219 If NO-CACHE is non-nil, cached contents of a message/external-body part
1220 are ignored."
1221   (let ((text (cond ((eq (mail-content-type-get (mm-handle-type handle)
1222                                                 'charset)
1223                          'gnus-decoded)
1224                      (with-current-buffer (mm-handle-buffer handle)
1225                        (buffer-string)))
1226                     ((mm-multibyte-p)
1227                      (mm-string-to-multibyte (mm-get-part handle no-cache)))
1228                     (t
1229                      (mm-get-part handle no-cache)))))
1230     (save-restriction
1231       (widen)
1232       (goto-char
1233        (prog1
1234            (point)
1235          (if (and (eq (get-char-property (max (point-min) (1- (point))) 'face)
1236                       'mm-uu-extract)
1237                   (eq (get-char-property 0 'face text) 'mm-uu-extract))
1238              ;; Separate the extracted parts that have the same faces.
1239              (insert "\n" text)
1240            (insert text)))))))
1241
1242 (defun mm-file-name-delete-whitespace (file-name)
1243   "Remove all whitespace characters from FILE-NAME."
1244   (while (string-match "\\s-+" file-name)
1245     (setq file-name (replace-match "" t t file-name)))
1246   file-name)
1247
1248 (defun mm-file-name-trim-whitespace (file-name)
1249   "Remove leading and trailing whitespace characters from FILE-NAME."
1250   (when (string-match "\\`\\s-+" file-name)
1251     (setq file-name (substring file-name (match-end 0))))
1252   (when (string-match "\\s-+\\'" file-name)
1253     (setq file-name (substring file-name 0 (match-beginning 0))))
1254   file-name)
1255
1256 (defun mm-file-name-collapse-whitespace (file-name)
1257   "Collapse multiple whitespace characters in FILE-NAME."
1258   (while (string-match "\\s-\\s-+" file-name)
1259     (setq file-name (replace-match " " t t file-name)))
1260   file-name)
1261
1262 (defun mm-file-name-replace-whitespace (file-name)
1263   "Replace whitespace characters in FILE-NAME with underscores.
1264 Set the option `mm-file-name-replace-whitespace' to any other
1265 string if you do not like underscores."
1266   (let ((s (or mm-file-name-replace-whitespace "_")))
1267     (while (string-match "\\s-" file-name)
1268       (setq file-name (replace-match s t t file-name))))
1269   file-name)
1270
1271 (defun mm-file-name-delete-control (filename)
1272   "Delete control characters from FILENAME."
1273   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1274
1275 (defun mm-file-name-delete-gotchas (filename)
1276   "Delete shell gotchas from FILENAME."
1277   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1278   (gnus-replace-in-string filename "^[.-]+" ""))
1279
1280 (defun mm-save-part (handle &optional prompt)
1281   "Write HANDLE to a file.
1282 PROMPT overrides the default one used to ask user for a file name."
1283   (let ((filename (or (mail-content-type-get
1284                        (mm-handle-disposition handle) 'filename)
1285                       (mail-content-type-get
1286                        (mm-handle-type handle) 'name)))
1287         file)
1288     (when filename
1289       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1290                                         (file-name-nondirectory filename))))
1291     (setq file
1292           (read-file-name
1293            (or prompt
1294                (format "Save MIME part to (default %s): "
1295                        (or filename "")))
1296            (or mm-default-directory default-directory)
1297            (expand-file-name (or filename "")
1298                              (or mm-default-directory default-directory))))
1299     (if (file-directory-p file)
1300         (setq file (expand-file-name filename file))
1301       (setq file (expand-file-name
1302                   file (or mm-default-directory default-directory))))
1303     (setq mm-default-directory (file-name-directory file))
1304     (and (or (not (file-exists-p file))
1305              (yes-or-no-p (format "File %s already exists; overwrite? "
1306                                   file)))
1307          (progn
1308            (mm-save-part-to-file handle file)
1309            file))))
1310
1311 (defun mm-add-meta-html-tag (handle &optional charset force-charset)
1312   "Add meta html tag to specify CHARSET of HANDLE in the current buffer.
1313 CHARSET defaults to the one HANDLE specifies.  Existing meta tag that
1314 specifies charset will not be modified unless FORCE-CHARSET is non-nil.
1315 Return t if meta tag is added or replaced."
1316   (when (equal (mm-handle-media-type handle) "text/html")
1317     (when (or charset
1318               (setq charset (mail-content-type-get (mm-handle-type handle)
1319                                                    'charset)))
1320       (setq charset (format "\
1321 <meta http-equiv=\"Content-Type\" content=\"text/html; charset=%s\">" charset))
1322       (let ((case-fold-search t))
1323         (goto-char (point-min))
1324         (if (re-search-forward "\
1325 <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
1326 text/\\(\\sw+\\)\\(?:\;\\s-*charset=\\(.+\\)\\)?[\"'][^>]*>" nil t)
1327             (if (and (not force-charset)
1328                      (match-beginning 2)
1329                      (string-match "\\`html\\'" (match-string 1)))
1330                 ;; Don't modify existing meta tag.
1331                 nil
1332               ;; Replace it with the one specifying charset.
1333               (replace-match charset)
1334               t)
1335           (if (re-search-forward "<head>\\s-*" nil t)
1336               (insert charset "\n")
1337             (re-search-forward "<html\\(?:\\s-+[^>]+\\|\\s-*\\)>\\s-*" nil t)
1338             (insert "<head>\n" charset "\n</head>\n"))
1339           t)))))
1340
1341 (defun mm-save-part-to-file (handle file)
1342   (mm-with-unibyte-buffer
1343     (mm-insert-part handle)
1344     (mm-add-meta-html-tag handle)
1345     (let ((current-file-modes (default-file-modes)))
1346       (set-default-file-modes mm-attachment-file-modes)
1347       (unwind-protect
1348           ;; Don't re-compress .gz & al.  Arguably we should make
1349           ;; `file-name-handler-alist' nil, but that would chop
1350           ;; ange-ftp, which is reasonable to use here.
1351           (mm-write-region (point-min) (point-max) file nil nil nil 'binary t)
1352         (set-default-file-modes current-file-modes)))))
1353
1354 (defun mm-pipe-part (handle &optional cmd)
1355   "Pipe HANDLE to a process.
1356 Use CMD as the process."
1357   (let ((name (mail-content-type-get (mm-handle-type handle) 'name))
1358         (command (or cmd
1359                      (gnus-read-shell-command
1360                       "Shell command on MIME part: " mm-last-shell-command))))
1361     (mm-with-unibyte-buffer
1362       (mm-insert-part handle)
1363       (mm-add-meta-html-tag handle)
1364       (let ((coding-system-for-write 'binary))
1365         (shell-command-on-region (point-min) (point-max) command nil)))))
1366
1367 (autoload 'gnus-completing-read "gnus-util")
1368
1369 (defun mm-interactively-view-part (handle)
1370   "Display HANDLE using METHOD."
1371   (let* ((type (mm-handle-media-type handle))
1372          (methods
1373           (mapcar (lambda (i) (cdr (assoc 'viewer i)))
1374                   (mailcap-mime-info type 'all)))
1375          (method (let ((minibuffer-local-completion-map
1376                         mm-viewer-completion-map))
1377                    (completing-read "Viewer: " methods))))
1378     (when (string= method "")
1379       (error "No method given"))
1380     (if (string-match "^[^% \t]+$" method)
1381         (setq method (concat method " %s")))
1382     (mm-display-external handle method)))
1383
1384 (defun mm-preferred-alternative (handles &optional preferred)
1385   "Say which of HANDLES are preferred."
1386   (let ((prec (if preferred (list preferred)
1387                 (mm-preferred-alternative-precedence handles)))
1388         p h result type handle)
1389     (while (setq p (pop prec))
1390       (setq h handles)
1391       (while h
1392         (setq handle (car h))
1393         (setq type (mm-handle-media-type handle))
1394         (when (and (equal p type)
1395                    (mm-automatic-display-p handle)
1396                    (or (stringp (car handle))
1397                        (not (mm-handle-disposition handle))
1398                        (equal (car (mm-handle-disposition handle))
1399                               "inline")))
1400           (setq result handle
1401                 h nil
1402                 prec nil))
1403         (pop h)))
1404     result))
1405
1406 (defun mm-preferred-alternative-precedence (handles)
1407   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1408   (setq handles (reverse handles))
1409   (dolist (disc (reverse mm-discouraged-alternatives))
1410     (dolist (handle (copy-sequence handles))
1411       (when (string-match disc (mm-handle-media-type handle))
1412         (setq handles (nconc (delete handle handles) (list handle))))))
1413   ;; Remove empty parts.
1414   (dolist (handle (copy-sequence handles))
1415     (when (and (bufferp (mm-handle-buffer handle))
1416                (not (with-current-buffer (mm-handle-buffer handle)
1417                       (goto-char (point-min))
1418                       (re-search-forward "[^ \t\n]" nil t))))
1419       (setq handles (nconc (delete handle handles) (list handle)))))
1420   (mapcar #'mm-handle-media-type handles))
1421
1422 (defun mm-get-content-id (id)
1423   "Return the handle(s) referred to by ID."
1424   (cdr (assoc id mm-content-id-alist)))
1425
1426 (defconst mm-image-type-regexps
1427   '(("/\\*.*XPM.\\*/" . xpm)
1428     ("P[1-6]" . pbm)
1429     ("GIF8" . gif)
1430     ("\377\330" . jpeg)
1431     ("\211PNG\r\n" . png)
1432     ("#define" . xbm)
1433     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1434     ("%!PS" . postscript))
1435   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1436 When the first bytes of an image file match REGEXP, it is assumed to
1437 be of image type IMAGE-TYPE.")
1438
1439 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1440 (defun mm-image-type-from-buffer ()
1441   "Determine the image type from data in the current buffer.
1442 Value is a symbol specifying the image type or nil if type cannot
1443 be determined."
1444   (let ((types mm-image-type-regexps)
1445         type)
1446     (goto-char (point-min))
1447     (while (and types (null type))
1448       (let ((regexp (car (car types)))
1449             (image-type (cdr (car types))))
1450         (when (looking-at regexp)
1451           (setq type image-type))
1452         (setq types (cdr types))))
1453     type))
1454
1455 (defun mm-get-image (handle)
1456   "Return an image instance based on HANDLE."
1457   (let ((type (mm-handle-media-subtype handle))
1458         spec)
1459     ;; Allow some common translations.
1460     (setq type
1461           (cond
1462            ((equal type "x-pixmap")
1463             "xpm")
1464            ((equal type "x-xbitmap")
1465             "xbm")
1466            ((equal type "x-portable-bitmap")
1467             "pbm")
1468            (t type)))
1469     (or (mm-handle-cache handle)
1470         (mm-with-unibyte-buffer
1471           (mm-insert-part handle)
1472           (prog1
1473               (setq spec
1474                     (ignore-errors
1475                       ;; Avoid testing `make-glyph' since W3 may define
1476                       ;; a bogus version of it.
1477                       (if (fboundp 'create-image)
1478                           (create-image (buffer-string)
1479                                         (or (mm-image-type-from-buffer)
1480                                             (intern type))
1481                                         'data-p)
1482                         (mm-create-image-xemacs type))))
1483             (mm-handle-set-cache handle spec))))))
1484
1485 (defun mm-create-image-xemacs (type)
1486   (when (featurep 'xemacs)
1487     (cond
1488      ((equal type "xbm")
1489       ;; xbm images require special handling, since
1490       ;; the only way to create glyphs from these
1491       ;; (without a ton of work) is to write them
1492       ;; out to a file, and then create a file
1493       ;; specifier.
1494       (let ((file (mm-make-temp-file
1495                    (expand-file-name "emm" mm-tmp-directory)
1496                    nil ".xbm")))
1497         (unwind-protect
1498             (progn
1499               (write-region (point-min) (point-max) file)
1500               (make-glyph (list (cons 'x file))))
1501           (ignore-errors
1502             (delete-file file)))))
1503      (t
1504       (make-glyph
1505        (vector
1506         (or (mm-image-type-from-buffer)
1507             (intern type))
1508         :data (buffer-string)))))))
1509
1510 (declare-function image-size "image.c" (spec &optional pixels frame))
1511
1512 (defun mm-image-fit-p (handle)
1513   "Say whether the image in HANDLE will fit the current window."
1514   (let ((image (mm-get-image handle)))
1515     (or (not image)
1516         (if (featurep 'xemacs)
1517             ;; XEmacs's glyphs can actually tell us about their width, so
1518             ;; let's be nice and smart about them.
1519             (or mm-inline-large-images
1520                 (and (<= (glyph-width image) (window-pixel-width))
1521                      (<= (glyph-height image) (window-pixel-height))))
1522           (let* ((size (image-size image))
1523                  (w (car size))
1524                  (h (cdr size)))
1525             (or mm-inline-large-images
1526                 (and (<= h (1- (window-height))) ; Don't include mode line.
1527                      (<= w (window-width)))))))))
1528
1529 (defun mm-valid-image-format-p (format)
1530   "Say whether FORMAT can be displayed natively by Emacs."
1531   (cond
1532    ;; Handle XEmacs
1533    ((fboundp 'valid-image-instantiator-format-p)
1534     (valid-image-instantiator-format-p format))
1535    ;; Handle Emacs
1536    ((fboundp 'image-type-available-p)
1537     (and (display-graphic-p)
1538          (image-type-available-p format)))
1539    ;; Nobody else can do images yet.
1540    (t
1541     nil)))
1542
1543 (defun mm-valid-and-fit-image-p (format handle)
1544   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1545   (and (mm-valid-image-format-p format)
1546        (mm-image-fit-p handle)))
1547
1548 (defun mm-find-part-by-type (handles type &optional notp recursive)
1549   "Search in HANDLES for part with TYPE.
1550 If NOTP, returns first non-matching part.
1551 If RECURSIVE, search recursively."
1552   (let (handle)
1553     (while handles
1554       (if (and recursive (stringp (caar handles)))
1555           (if (setq handle (mm-find-part-by-type (cdar handles) type
1556                                                  notp recursive))
1557               (setq handles nil))
1558         (if (if notp
1559                 (not (equal (mm-handle-media-type (car handles)) type))
1560               (equal (mm-handle-media-type (car handles)) type))
1561             (setq handle (car handles)
1562                   handles nil)))
1563       (setq handles (cdr handles)))
1564     handle))
1565
1566 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1567   (goto-char (point-min))
1568   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1569                                                                    'boundary)))
1570          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1571          start
1572          (end (save-excursion
1573                 (goto-char (point-max))
1574                 (if (re-search-backward close-delimiter nil t)
1575                     (match-beginning 0)
1576                   (point-max))))
1577          result)
1578     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1579     (while (and (not result)
1580                 (re-search-forward boundary end t))
1581       (goto-char (match-beginning 0))
1582       (when start
1583         (save-excursion
1584           (save-restriction
1585             (narrow-to-region start (1- (point)))
1586             (when (let* ((ct (mail-fetch-field "content-type"))
1587                          (ctl (and ct (mail-header-parse-content-type ct))))
1588                     (if notp
1589                         (not (equal (car ctl) type))
1590                       (equal (car ctl) type)))
1591               (setq result (buffer-string))))))
1592       (forward-line 1)
1593       (setq start (point)))
1594     (when (and (not result) start)
1595       (save-excursion
1596         (save-restriction
1597           (narrow-to-region start end)
1598           (when (let* ((ct (mail-fetch-field "content-type"))
1599                        (ctl (and ct (mail-header-parse-content-type ct))))
1600                   (if notp
1601                       (not (equal (car ctl) type))
1602                     (equal (car ctl) type)))
1603             (setq result (buffer-string))))))
1604     result))
1605
1606 (defvar mm-security-handle nil)
1607
1608 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1609   ;; HANDLE could be a CTL.
1610   (when handle
1611     (put-text-property 0 (length (car handle)) parameter value
1612                        (car handle))))
1613
1614 (autoload 'mm-view-pkcs7 "mm-view")
1615
1616 (defun mm-possibly-verify-or-decrypt (parts ctl &optional from)
1617   (let ((type (car ctl))
1618         (subtype (cadr (split-string (car ctl) "/")))
1619         (mm-security-handle ctl) ;; (car CTL) is the type.
1620         protocol func functest)
1621     (cond
1622      ((or (equal type "application/x-pkcs7-mime")
1623           (equal type "application/pkcs7-mime"))
1624       (with-temp-buffer
1625         (when (and (cond
1626                     ((eq mm-decrypt-option 'never) nil)
1627                     ((eq mm-decrypt-option 'always) t)
1628                     ((eq mm-decrypt-option 'known) t)
1629                     (t (y-or-n-p
1630                         (format "Decrypt (S/MIME) part? "))))
1631                    (mm-view-pkcs7 parts from))
1632           (setq parts (mm-dissect-buffer t)))))
1633      ((equal subtype "signed")
1634       (unless (and (setq protocol
1635                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1636                    (not (equal protocol "multipart/mixed")))
1637         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1638         (let ((protocols mm-verify-function-alist))
1639           (while protocols
1640             (if (and (or (not (setq functest (nth 3 (car protocols))))
1641                          (funcall functest parts ctl))
1642                      (mm-find-part-by-type parts (caar protocols) nil t))
1643                 (setq protocol (caar protocols)
1644                       protocols nil)
1645               (setq protocols (cdr protocols))))))
1646       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1647       (when (cond
1648              ((eq mm-verify-option 'never) nil)
1649              ((eq mm-verify-option 'always) t)
1650              ((eq mm-verify-option 'known)
1651               (and func
1652                    (or (not (setq functest
1653                                   (nth 3 (assoc protocol
1654                                                 mm-verify-function-alist))))
1655                        (funcall functest parts ctl))))
1656              (t
1657               (y-or-n-p
1658                (format "Verify signed (%s) part? "
1659                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1660                            (format "protocol=%s" protocol))))))
1661         (save-excursion
1662           (if func
1663               (setq parts (funcall func parts ctl))
1664             (mm-set-handle-multipart-parameter
1665              mm-security-handle 'gnus-details
1666              (format "Unknown sign protocol (%s)" protocol))))))
1667      ((equal subtype "encrypted")
1668       (unless (setq protocol
1669                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1670         ;; The message is broken.
1671         (let ((parts parts))
1672           (while parts
1673             (if (assoc (mm-handle-media-type (car parts))
1674                        mm-decrypt-function-alist)
1675                 (setq protocol (mm-handle-media-type (car parts))
1676                       parts nil)
1677               (setq parts (cdr parts))))))
1678       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1679       (when (cond
1680              ((eq mm-decrypt-option 'never) nil)
1681              ((eq mm-decrypt-option 'always) t)
1682              ((eq mm-decrypt-option 'known)
1683               (and func
1684                    (or (not (setq functest
1685                                   (nth 3 (assoc protocol
1686                                                 mm-decrypt-function-alist))))
1687                        (funcall functest parts ctl))))
1688              (t
1689               (y-or-n-p
1690                (format "Decrypt (%s) part? "
1691                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1692                            (format "protocol=%s" protocol))))))
1693         (save-excursion
1694           (if func
1695               (setq parts (funcall func parts ctl))
1696             (mm-set-handle-multipart-parameter
1697              mm-security-handle 'gnus-details
1698              (format "Unknown encrypt protocol (%s)" protocol))))))
1699      (t nil))
1700     parts))
1701
1702 (defun mm-multiple-handles (handles)
1703   (and (listp handles)
1704        (> (length handles) 1)
1705        (or (listp (car handles))
1706            (stringp (car handles)))))
1707
1708 (defun mm-complicated-handles (handles)
1709   (and (listp (car handles))
1710        (> (length handles) 1)))
1711
1712 (defun mm-merge-handles (handles1 handles2)
1713   (append
1714    (if (listp (car handles1))
1715        handles1
1716      (list handles1))
1717    (if (listp (car handles2))
1718        handles2
1719      (list handles2))))
1720
1721 (defun mm-readable-p (handle)
1722   "Say whether the content of HANDLE is readable."
1723   (and (< (with-current-buffer (mm-handle-buffer handle)
1724             (buffer-size)) 10000)
1725        (mm-with-unibyte-buffer
1726          (mm-insert-part handle)
1727          (and (eq (mm-body-7-or-8) '7bit)
1728               (not (mm-long-lines-p 76))))))
1729
1730 (declare-function libxml-parse-html-region "xml.c"
1731                   (start end &optional base-url))
1732 (declare-function shr-insert-document "shr" (dom))
1733 (defvar shr-blocked-images)
1734 (defvar gnus-inhibit-images)
1735 (autoload 'gnus-blocked-images "gnus-art")
1736
1737 (defun mm-shr (handle)
1738   ;; Require since we bind its variables.
1739   (require 'shr)
1740   (let ((article-buffer (current-buffer))
1741         (shr-content-function (lambda (id)
1742                                 (let ((handle (mm-get-content-id id)))
1743                                   (when handle
1744                                     (mm-with-part handle
1745                                       (buffer-string))))))
1746         shr-inhibit-images shr-blocked-images charset char)
1747     (if (and (boundp 'gnus-summary-buffer)
1748              (bufferp gnus-summary-buffer)
1749              (buffer-name gnus-summary-buffer))
1750         (with-current-buffer gnus-summary-buffer
1751           (setq shr-inhibit-images gnus-inhibit-images
1752                 shr-blocked-images (gnus-blocked-images)))
1753       (setq shr-inhibit-images gnus-inhibit-images
1754             shr-blocked-images (gnus-blocked-images)))
1755     (unless handle
1756       (setq handle (mm-dissect-buffer t)))
1757     (setq charset (mail-content-type-get (mm-handle-type handle) 'charset))
1758     (save-restriction
1759       (narrow-to-region (point) (point))
1760       (shr-insert-document
1761        (mm-with-part handle
1762          (insert (prog1
1763                      (if (and charset
1764                               (setq charset
1765                                     (mm-charset-to-coding-system charset))
1766                               (not (eq charset 'ascii)))
1767                          (mm-decode-coding-string (buffer-string) charset)
1768                        (mm-string-as-multibyte (buffer-string)))
1769                    (erase-buffer)
1770                    (mm-enable-multibyte)))
1771          (goto-char (point-min))
1772          (setq case-fold-search t)
1773          (while (re-search-forward
1774                  "&#\\(?:x\\([89][0-9a-f]\\)\\|\\(1[2-5][0-9]\\)\\);" nil t)
1775            (when (setq char
1776                        (cdr (assq (if (match-beginning 1)
1777                                       (string-to-number (match-string 1) 16)
1778                                     (string-to-number (match-string 2)))
1779                                   mm-extra-numeric-entities)))
1780              (replace-match (char-to-string char))))
1781          ;; Remove "soft hyphens".
1782          (goto-char (point-min))
1783          (while (search-forward "" nil t)
1784            (replace-match "" t t))
1785          (libxml-parse-html-region (point-min) (point-max))))
1786       (unless (bobp)
1787         (insert "\n"))
1788       (mm-handle-set-undisplayer
1789        handle
1790        `(lambda ()
1791           (let ((inhibit-read-only t))
1792             (delete-region ,(point-min-marker)
1793                            ,(point-max-marker))))))))
1794
1795 (defun mm-handle-filename (handle)
1796   "Return filename of HANDLE if any."
1797   (or (mail-content-type-get (mm-handle-type handle)
1798                              'name)
1799       (mail-content-type-get (mm-handle-disposition handle)
1800                              'filename)))
1801
1802 (provide 'mm-decode)
1803
1804 ;;; mm-decode.el ends here