lisp/gnus/mm-decode.el

   1 ;;; mm-decode.el --- Functions for decoding MIME things
   2
   3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;;      MORIOKA Tomohiko <morioka@jaist.ac.jp>
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (require 'mail-parse)
  30 (require 'mailcap)
  31 (require 'mm-bodies)
  32 (eval-when-compile (require 'cl)
  33                    (require 'term))
  34
  35 (eval-and-compile
  36   (autoload 'mm-inline-partial "mm-partial")
  37   (autoload 'mm-inline-external-body "mm-extern")
  38   (autoload 'mm-extern-cache-contents "mm-extern")
  39   (autoload 'mm-insert-inline "mm-view"))
  40
  41 (defvar gnus-current-window-configuration)
  42
  43 (add-hook 'gnus-exit-gnus-hook 'mm-destroy-postponed-undisplay-list)
  44
  45 (defgroup mime-display ()
  46   "Display of MIME in mail and news articles."
  47   :link '(custom-manual "(emacs-mime)Display Customization")
  48   :version "21.1"
  49   :group 'mail
  50   :group 'news
  51   :group 'multimedia)
  52
  53 (defgroup mime-security ()
  54   "MIME security in mail and news articles."
  55   :link '(custom-manual "(emacs-mime)Display Customization")
  56   :group 'mail
  57   :group 'news
  58   :group 'multimedia)
  59
  60 ;;; Convenience macros.
  61
  62 (defmacro mm-handle-buffer (handle)
  63   `(nth 0 ,handle))
  64 (defmacro mm-handle-type (handle)
  65   `(nth 1 ,handle))
  66 (defsubst mm-handle-media-type (handle)
  67   (if (stringp (car handle))
  68       (car handle)
  69     (car (mm-handle-type handle))))
  70 (defsubst mm-handle-media-supertype (handle)
  71   (car (split-string (mm-handle-media-type handle) "/")))
  72 (defsubst mm-handle-media-subtype (handle)
  73   (cadr (split-string (mm-handle-media-type handle) "/")))
  74 (defmacro mm-handle-encoding (handle)
  75   `(nth 2 ,handle))
  76 (defmacro mm-handle-undisplayer (handle)
  77   `(nth 3 ,handle))
  78 (defmacro mm-handle-set-undisplayer (handle function)
  79   `(setcar (nthcdr 3 ,handle) ,function))
  80 (defmacro mm-handle-disposition (handle)
  81   `(nth 4 ,handle))
  82 (defmacro mm-handle-description (handle)
  83   `(nth 5 ,handle))
  84 (defmacro mm-handle-cache (handle)
  85   `(nth 6 ,handle))
  86 (defmacro mm-handle-set-cache (handle contents)
  87   `(setcar (nthcdr 6 ,handle) ,contents))
  88 (defmacro mm-handle-id (handle)
  89   `(nth 7 ,handle))
  90 (defmacro mm-handle-multipart-original-buffer (handle)
  91   `(get-text-property 0 'buffer (car ,handle)))
  92 (defmacro mm-handle-multipart-from (handle)
  93   `(get-text-property 0 'from (car ,handle)))
  94 (defmacro mm-handle-multipart-ctl-parameter (handle parameter)
  95   `(get-text-property 0 ,parameter (car ,handle)))
  96
  97 (defmacro mm-make-handle (&optional buffer type encoding undisplayer
  98                                     disposition description cache
  99                                     id)
 100   `(list ,buffer ,type ,encoding ,undisplayer
 101          ,disposition ,description ,cache ,id))
 102
 103 (defcustom mm-text-html-renderer
 104   (cond ((locate-library "w3") 'w3)
 105         ((executable-find "w3m") (if (locate-library "w3m")
 106                                      'w3m
 107                                    'w3m-standalone))
 108         ((executable-find "links") 'links)
 109         ((executable-find "lynx") 'lynx)
 110         (t 'html2text))
 111   "Render of HTML contents.
 112 It is one of defined renderer types, or a rendering function.
 113 The defined renderer types are:
 114 `w3'   : use Emacs/W3;
 115 `w3m'  : use emacs-w3m;
 116 `w3m-standalone': use w3m;
 117 `links': use links;
 118 `lynx' : use lynx;
 119 `html2text' : use html2text;
 120 nil    : use external viewer."
 121   :version "22.1"
 122   :type '(choice (const w3)
 123                  (const w3m)
 124                  (const w3m-standalone)
 125                  (const links)
 126                  (const lynx)
 127                  (const html2text)
 128                  (const nil)
 129                  (function))
 130   :group 'mime-display)
 131
 132 (defvar mm-inline-text-html-renderer nil
 133   "Function used for rendering inline HTML contents.
 134 It is suggested to customize `mm-text-html-renderer' instead.")
 135
 136 (defcustom mm-inline-text-html-with-images nil
 137   "If non-nil, Gnus will allow retrieving images in HTML contents with
 138 the <img> tags.  It has no effect on Emacs/w3.  See also the
 139 documentation for the `mm-w3m-safe-url-regexp' variable."
 140   :version "22.1"
 141   :type 'boolean
 142   :group 'mime-display)
 143
 144 (defcustom mm-w3m-safe-url-regexp "\\`cid:"
 145   "Regexp matching URLs which are considered to be safe.
 146 Some HTML mails might contain a nasty trick used by spammers, using
 147 the <img> tag which is far more evil than the [Click Here!] button.
 148 It is most likely intended to check whether the ominous spam mail has
 149 reached your eyes or not, in which case the spammer knows for sure
 150 that your email address is valid.  It is done by embedding an
 151 identifier string into a URL that you might automatically retrieve
 152 when displaying the image.  The default value is \"\\\\`cid:\" which only
 153 matches parts embedded to the Multipart/Related type MIME contents and
 154 Gnus will never connect to the spammer's site arbitrarily.  You may
 155 set this variable to nil if you consider all urls to be safe."
 156   :version "22.1"
 157   :type '(choice (regexp :tag "Regexp")
 158                  (const :tag "All URLs are safe" nil))
 159   :group 'mime-display)
 160
 161 (defcustom mm-inline-text-html-with-w3m-keymap t
 162   "If non-nil, use emacs-w3m command keys in the article buffer."
 163   :version "22.1"
 164   :type 'boolean
 165   :group 'mime-display)
 166
 167 (defcustom mm-enable-external t
 168   "Indicate whether external MIME handlers should be used.
 169
 170 If t, all defined external MIME handlers are used.  If nil, files are saved by
 171 `mailcap-save-binary-file'.  If it is the symbol `ask', you are prompted
 172 before the external MIME handler is invoked."
 173   :version "22.1"
 174   :type '(choice (const :tag "Always" t)
 175                  (const :tag "Never" nil)
 176                  (const :tag "Ask" ask))
 177   :group 'mime-display)
 178
 179 (defcustom mm-inline-media-tests
 180   '(("image/p?jpeg"
 181      mm-inline-image
 182      (lambda (handle)
 183        (mm-valid-and-fit-image-p 'jpeg handle)))
 184     ("image/png"
 185      mm-inline-image
 186      (lambda (handle)
 187        (mm-valid-and-fit-image-p 'png handle)))
 188     ("image/gif"
 189      mm-inline-image
 190      (lambda (handle)
 191        (mm-valid-and-fit-image-p 'gif handle)))
 192     ("image/tiff"
 193      mm-inline-image
 194      (lambda (handle)
 195        (mm-valid-and-fit-image-p 'tiff handle)) )
 196     ("image/xbm"
 197      mm-inline-image
 198      (lambda (handle)
 199        (mm-valid-and-fit-image-p 'xbm handle)))
 200     ("image/x-xbitmap"
 201      mm-inline-image
 202      (lambda (handle)
 203        (mm-valid-and-fit-image-p 'xbm handle)))
 204     ("image/xpm"
 205      mm-inline-image
 206      (lambda (handle)
 207        (mm-valid-and-fit-image-p 'xpm handle)))
 208     ("image/x-xpixmap"
 209      mm-inline-image
 210      (lambda (handle)
 211        (mm-valid-and-fit-image-p 'xpm handle)))
 212     ("image/bmp"
 213      mm-inline-image
 214      (lambda (handle)
 215        (mm-valid-and-fit-image-p 'bmp handle)))
 216     ("image/x-portable-bitmap"
 217      mm-inline-image
 218      (lambda (handle)
 219        (mm-valid-and-fit-image-p 'pbm handle)))
 220     ("text/plain" mm-inline-text identity)
 221     ("text/enriched" mm-inline-text identity)
 222     ("text/richtext" mm-inline-text identity)
 223     ("text/x-patch" mm-display-patch-inline
 224      (lambda (handle)
 225        ;; If the diff-mode.el package is installed, the function is
 226        ;; autoloaded.  Checking (locate-library "diff-mode") would be trying
 227        ;; to cater to broken installations.  OTOH checking the function
 228        ;; makes it possible to install another package which provides an
 229        ;; alternative implementation of diff-mode.  --Stef
 230        (fboundp 'diff-mode)))
 231     ("application/emacs-lisp" mm-display-elisp-inline identity)
 232     ("application/x-emacs-lisp" mm-display-elisp-inline identity)
 233     ("text/dns" mm-display-dns-inline identity)
 234     ("text/html"
 235      mm-inline-text-html
 236      (lambda (handle)
 237        (or mm-inline-text-html-renderer
 238            mm-text-html-renderer)))
 239     ("text/x-vcard"
 240      mm-inline-text-vcard
 241      (lambda (handle)
 242        (or (featurep 'vcard)
 243            (locate-library "vcard"))))
 244     ("message/delivery-status" mm-inline-text identity)
 245     ("message/rfc822" mm-inline-message identity)
 246     ("message/partial" mm-inline-partial identity)
 247     ("message/external-body" mm-inline-external-body identity)
 248     ("text/.*" mm-inline-text identity)
 249     ("audio/wav" mm-inline-audio
 250      (lambda (handle)
 251        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 252             (device-sound-enabled-p))))
 253     ("audio/au"
 254      mm-inline-audio
 255      (lambda (handle)
 256        (and (or (featurep 'nas-sound) (featurep 'native-sound))
 257             (device-sound-enabled-p))))
 258     ("application/pgp-signature" ignore identity)
 259     ("application/x-pkcs7-signature" ignore identity)
 260     ("application/pkcs7-signature" ignore identity)
 261     ("application/x-pkcs7-mime" ignore identity)
 262     ("application/pkcs7-mime" ignore identity)
 263     ("multipart/alternative" ignore identity)
 264     ("multipart/mixed" ignore identity)
 265     ("multipart/related" ignore identity)
 266     ;; Disable audio and image
 267     ("audio/.*" ignore ignore)
 268     ("image/.*" ignore ignore)
 269     ;; Default to displaying as text
 270     (".*" mm-inline-text mm-readable-p))
 271   "Alist of media types/tests saying whether types can be displayed inline."
 272   :type '(repeat (list (regexp :tag "MIME type")
 273                        (function :tag "Display function")
 274                        (function :tag "Display test")))
 275   :group 'mime-display)
 276
 277 (defcustom mm-inlined-types
 278   '("image/.*" "text/.*" "message/delivery-status" "message/rfc822"
 279     "message/partial" "message/external-body" "application/emacs-lisp"
 280     "application/x-emacs-lisp"
 281     "application/pgp-signature" "application/x-pkcs7-signature"
 282     "application/pkcs7-signature" "application/x-pkcs7-mime"
 283     "application/pkcs7-mime"
 284     ;; Mutt still uses this even though it has already been withdrawn.
 285     "application/pgp")
 286   "List of media types that are to be displayed inline.
 287 See also `mm-inline-media-tests', which says how to display a media
 288 type inline."
 289   :type '(repeat regexp)
 290   :group 'mime-display)
 291
 292 (defcustom mm-keep-viewer-alive-types
 293   '("application/postscript" "application/msword" "application/vnd.ms-excel"
 294     "application/pdf" "application/x-dvi")
 295   "List of media types for which the external viewer will not be killed
 296 when selecting a different article."
 297   :version "22.1"
 298   :type '(repeat regexp)
 299   :group 'mime-display)
 300
 301 (defcustom mm-automatic-display
 302   '("text/plain" "text/enriched" "text/richtext" "text/html" "text/x-verbatim"
 303     "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
 304     "message/rfc822" "text/x-patch" "text/dns" "application/pgp-signature"
 305     "application/emacs-lisp" "application/x-emacs-lisp"
 306     "application/x-pkcs7-signature"
 307     "application/pkcs7-signature" "application/x-pkcs7-mime"
 308     "application/pkcs7-mime"
 309     ;; Mutt still uses this even though it has already been withdrawn.
 310     "application/pgp\\'")
 311   "A list of MIME types to be displayed automatically."
 312   :type '(repeat regexp)
 313   :group 'mime-display)
 314
 315 (defcustom mm-attachment-override-types '("text/x-vcard"
 316                                           "application/pkcs7-mime"
 317                                           "application/x-pkcs7-mime"
 318                                           "application/pkcs7-signature"
 319                                           "application/x-pkcs7-signature")
 320   "Types to have \"attachment\" ignored if they can be displayed inline."
 321   :type '(repeat regexp)
 322   :group 'mime-display)
 323
 324 (defcustom mm-inline-override-types nil
 325   "Types to be treated as attachments even if they can be displayed inline."
 326   :type '(repeat regexp)
 327   :group 'mime-display)
 328
 329 (defcustom mm-automatic-external-display nil
 330   "List of MIME type regexps that will be displayed externally automatically."
 331   :type '(repeat regexp)
 332   :group 'mime-display)
 333
 334 (defcustom mm-discouraged-alternatives nil
 335   "List of MIME types that are discouraged when viewing multipart/alternative.
 336 Viewing agents are supposed to view the last possible part of a message,
 337 as that is supposed to be the richest.  However, users may prefer other
 338 types instead, and this list says what types are most unwanted.  If,
 339 for instance, text/html parts are very unwanted, and text/richtext are
 340 somewhat unwanted, then the value of this variable should be set
 341 to:
 342
 343  (\"text/html\" \"text/richtext\")
 344
 345 Adding \"image/.*\" might also be useful.  Spammers use it as the
 346 prefered part of multipart/alternative messages.  See also
 347 `gnus-buttonized-mime-types', to which adding \"multipart/alternative\"
 348 enables you to choose manually one of two types those mails include."
 349   :type '(repeat regexp) ;; See `mm-preferred-alternative-precedence'.
 350   :group 'mime-display)
 351
 352 (defcustom mm-tmp-directory
 353   (if (fboundp 'temp-directory)
 354       (temp-directory)
 355     (if (boundp 'temporary-file-directory)
 356         temporary-file-directory
 357       "/tmp/"))
 358   "Where mm will store its temporary files."
 359   :type 'directory
 360   :group 'mime-display)
 361
 362 (defcustom mm-inline-large-images nil
 363   "If non-nil, then all images fit in the buffer."
 364   :type 'boolean
 365   :group 'mime-display)
 366
 367 (defcustom mm-file-name-rewrite-functions
 368   '(mm-file-name-delete-control mm-file-name-delete-gotchas)
 369   "List of functions used for rewriting file names of MIME parts.
 370 Each function takes a file name as input and returns a file name.
 371
 372 Ready-made functions include `mm-file-name-delete-control',
 373 `mm-file-name-delete-gotchas' (you should not remove these two
 374 functions), `mm-file-name-delete-whitespace',
 375 `mm-file-name-trim-whitespace', `mm-file-name-collapse-whitespace',
 376 `mm-file-name-replace-whitespace', `capitalize', `downcase',
 377 `upcase', and `upcase-initials'."
 378   :type '(list (set :inline t
 379                     (const mm-file-name-delete-control)
 380                     (const mm-file-name-delete-gotchas)
 381                     (const mm-file-name-delete-whitespace)
 382                     (const mm-file-name-trim-whitespace)
 383                     (const mm-file-name-collapse-whitespace)
 384                     (const mm-file-name-replace-whitespace)
 385                     (const capitalize)
 386                     (const downcase)
 387                     (const upcase)
 388                     (const upcase-initials)
 389                (repeat :inline t
 390                        :tag "Function"
 391                        function)))
 392   :version "23.0" ;; No Gnus
 393   :group 'mime-display)
 394
 395
 396 (defvar mm-path-name-rewrite-functions nil
 397   "*List of functions for rewriting the full file names of MIME parts.
 398 This is used when viewing parts externally, and is meant for
 399 transforming the absolute name so that non-compliant programs can find
 400 the file where it's saved.
 401
 402 Each function takes a file name as input and returns a file name.")
 403
 404 (defvar mm-file-name-replace-whitespace nil
 405   "String used for replacing whitespace characters; default is `\"_\"'.")
 406
 407 (defcustom mm-default-directory nil
 408   "The default directory where mm will save files.
 409 If not set, `default-directory' will be used."
 410   :type '(choice directory (const :tag "Default" nil))
 411   :group 'mime-display)
 412
 413 (defcustom mm-attachment-file-modes 384
 414   "Set the mode bits of saved attachments to this integer."
 415   :version "22.1"
 416   :type 'integer
 417   :group 'mime-display)
 418
 419 (defcustom mm-external-terminal-program "xterm"
 420   "The program to start an external terminal."
 421   :version "22.1"
 422   :type 'string
 423   :group 'mime-display)
 424
 425 ;;; Internal variables.
 426
 427 (defvar mm-last-shell-command "")
 428 (defvar mm-content-id-alist nil)
 429 (defvar mm-postponed-undisplay-list nil)
 430
 431 ;; According to RFC2046, in particular, in a digest, the default
 432 ;; Content-Type value for a body part is changed from "text/plain" to
 433 ;; "message/rfc822".
 434 (defvar mm-dissect-default-type "text/plain")
 435
 436 (autoload 'mml2015-verify "mml2015")
 437 (autoload 'mml2015-verify-test "mml2015")
 438 (autoload 'mml-smime-verify "mml-smime")
 439 (autoload 'mml-smime-verify-test "mml-smime")
 440
 441 (defvar mm-verify-function-alist
 442   '(("application/pgp-signature" mml2015-verify "PGP" mml2015-verify-test)
 443     ("application/x-gnus-pgp-signature" mm-uu-pgp-signed-extract-1 "PGP"
 444      mm-uu-pgp-signed-test)
 445     ("application/pkcs7-signature" mml-smime-verify "S/MIME"
 446      mml-smime-verify-test)
 447     ("application/x-pkcs7-signature" mml-smime-verify "S/MIME"
 448      mml-smime-verify-test)))
 449
 450 (defcustom mm-verify-option 'never
 451   "Option of verifying signed parts.
 452 `never', not verify; `always', always verify;
 453 `known', only verify known protocols.  Otherwise, ask user.
 454
 455 When set to `always' or `known', you should add
 456 \"multipart/signed\" to `gnus-buttonized-mime-types' to see
 457 result of the verification."
 458   :version "22.1"
 459   :type '(choice (item always)
 460                  (item never)
 461                  (item :tag "only known protocols" known)
 462                  (item :tag "ask" nil))
 463   :group 'mime-security)
 464
 465 (autoload 'mml2015-decrypt "mml2015")
 466 (autoload 'mml2015-decrypt-test "mml2015")
 467
 468 (defvar mm-decrypt-function-alist
 469   '(("application/pgp-encrypted" mml2015-decrypt "PGP" mml2015-decrypt-test)
 470     ("application/x-gnus-pgp-encrypted" mm-uu-pgp-encrypted-extract-1 "PGP"
 471      mm-uu-pgp-encrypted-test)))
 472
 473 (defcustom mm-decrypt-option nil
 474   "Option of decrypting encrypted parts.
 475 `never', not decrypt; `always', always decrypt;
 476 `known', only decrypt known protocols.  Otherwise, ask user."
 477   :version "22.1"
 478   :type '(choice (item always)
 479                  (item never)
 480                  (item :tag "only known protocols" known)
 481                  (item :tag "ask" nil))
 482   :group 'mime-security)
 483
 484 (defvar mm-viewer-completion-map
 485   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 486     (set-keymap-parent map minibuffer-local-completion-map)
 487     ;; Should we bind other key to minibuffer-complete-word?
 488     (define-key map " " 'self-insert-command)
 489     map)
 490   "Keymap for input viewer with completion.")
 491
 492 (defvar mm-viewer-completion-map
 493   (let ((map (make-sparse-keymap 'mm-viewer-completion-map)))
 494     (set-keymap-parent map minibuffer-local-completion-map)
 495     ;; Should we bind other key to minibuffer-complete-word?
 496     (define-key map " " 'self-insert-command)
 497     map)
 498   "Keymap for input viewer with completion.")
 499
 500 ;;; The functions.
 501
 502 (defun mm-alist-to-plist (alist)
 503   "Convert association list ALIST into the equivalent property-list form.
 504 The plist is returned.  This converts from
 505
 506 \((a . 1) (b . 2) (c . 3))
 507
 508 into
 509
 510 \(a 1 b 2 c 3)
 511
 512 The original alist is not modified.  See also `destructive-alist-to-plist'."
 513   (let (plist)
 514     (while alist
 515       (let ((el (car alist)))
 516         (setq plist (cons (cdr el) (cons (car el) plist))))
 517       (setq alist (cdr alist)))
 518     (nreverse plist)))
 519
 520 (defun mm-keep-viewer-alive-p (handle)
 521   "Say whether external viewer for HANDLE should stay alive."
 522   (let ((types mm-keep-viewer-alive-types)
 523         (type (mm-handle-media-type handle))
 524         ty)
 525     (catch 'found
 526       (while (setq ty (pop types))
 527         (when (string-match ty type)
 528           (throw 'found t))))))
 529
 530 (defun mm-handle-set-external-undisplayer (handle function)
 531   "Set the undisplayer for HANDLE to FUNCTION.
 532 Postpone undisplaying of viewers for types in
 533 `mm-keep-viewer-alive-types'."
 534   (if (mm-keep-viewer-alive-p handle)
 535       (let ((new-handle (copy-sequence handle)))
 536         (mm-handle-set-undisplayer new-handle function)
 537         (mm-handle-set-undisplayer handle nil)
 538         (push new-handle mm-postponed-undisplay-list))
 539     (mm-handle-set-undisplayer handle function)))
 540
 541 (defun mm-destroy-postponed-undisplay-list ()
 542   (when mm-postponed-undisplay-list
 543     (message "Destroying external MIME viewers")
 544     (mm-destroy-parts mm-postponed-undisplay-list)))
 545
 546 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
 547   "Dissect the current buffer and return a list of MIME handles."
 548   (save-excursion
 549     (let (ct ctl type subtype cte cd description id result)
 550       (save-restriction
 551         (mail-narrow-to-head)
 552         (when (or no-strict-mime
 553                   loose-mime
 554                   (mail-fetch-field "mime-version"))
 555           (setq ct (mail-fetch-field "content-type")
 556                 ctl (and ct (mail-header-parse-content-type ct))
 557                 cte (mail-fetch-field "content-transfer-encoding")
 558                 cd (mail-fetch-field "content-disposition")
 559                 description (mail-fetch-field "content-description")
 560                 id (mail-fetch-field "content-id"))
 561           (unless from
 562             (setq from (mail-fetch-field "from")))
 563           ;; FIXME: In some circumstances, this code is running within
 564           ;; an unibyte macro.  mail-extract-address-components
 565           ;; creates unibyte buffers. This `if', though not a perfect
 566           ;; solution, avoids most of them.
 567           (if from
 568               (setq from (cadr (mail-extract-address-components from))))))
 569       (if (or (not ctl)
 570               (not (string-match "/" (car ctl))))
 571           (mm-dissect-singlepart
 572            (list mm-dissect-default-type)
 573            (and cte (intern (downcase (mail-header-strip cte))))
 574            no-strict-mime
 575            (and cd (mail-header-parse-content-disposition cd))
 576            description)
 577         (setq type (split-string (car ctl) "/"))
 578         (setq subtype (cadr type)
 579               type (car type))
 580         (setq
 581          result
 582          (cond
 583           ((equal type "multipart")
 584            (let ((mm-dissect-default-type (if (equal subtype "digest")
 585                                               "message/rfc822"
 586                                             "text/plain"))
 587                  (start (cdr (assq 'start (cdr ctl)))))
 588              (add-text-properties 0 (length (car ctl))
 589                                   (mm-alist-to-plist (cdr ctl)) (car ctl))
 590
 591              ;; what really needs to be done here is a way to link a
 592              ;; MIME handle back to it's parent MIME handle (in a multilevel
 593              ;; MIME article).  That would probably require changing
 594              ;; the mm-handle API so we simply store the multipart buffer
 595              ;; name as a text property of the "multipart/whatever" string.
 596              (add-text-properties 0 (length (car ctl))
 597                                   (list 'buffer (mm-copy-to-buffer)
 598                                         'from from
 599                                         'start start)
 600                                   (car ctl))
 601              (cons (car ctl) (mm-dissect-multipart ctl from))))
 602           (t
 603            (mm-possibly-verify-or-decrypt
 604             (mm-dissect-singlepart
 605              ctl
 606              (and cte (intern (downcase (mail-header-strip cte))))
 607              no-strict-mime
 608              (and cd (mail-header-parse-content-disposition cd))
 609              description id)
 610             ctl))))
 611         (when id
 612           (when (string-match " *<\\(.*\\)> *" id)
 613             (setq id (match-string 1 id)))
 614           (push (cons id result) mm-content-id-alist))
 615         result))))
 616
 617 (defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
 618   (when (or force
 619             (if (equal "text/plain" (car ctl))
 620                 (assoc 'format ctl)
 621               t))
 622     (mm-make-handle
 623      (mm-copy-to-buffer) ctl cte nil cdl description nil id)))
 624
 625 (defun mm-dissect-multipart (ctl from)
 626   (goto-char (point-min))
 627   (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
 628          (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
 629          start parts
 630          (end (save-excursion
 631                 (goto-char (point-max))
 632                 (if (re-search-backward close-delimiter nil t)
 633                     (match-beginning 0)
 634                   (point-max)))))
 635     (setq boundary (concat (regexp-quote boundary) "[ \t]*$"))
 636     (while (and (< (point) end) (re-search-forward boundary end t))
 637       (goto-char (match-beginning 0))
 638       (when start
 639         (save-excursion
 640           (save-restriction
 641             (narrow-to-region start (point))
 642             (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 643       (end-of-line 2)
 644       (or (looking-at boundary)
 645           (forward-line 1))
 646       (setq start (point)))
 647     (when (and start (< start end))
 648       (save-excursion
 649         (save-restriction
 650           (narrow-to-region start end)
 651           (setq parts (nconc (list (mm-dissect-buffer t nil from)) parts)))))
 652     (mm-possibly-verify-or-decrypt (nreverse parts) ctl)))
 653
 654 (defun mm-copy-to-buffer ()
 655   "Copy the contents of the current buffer to a fresh buffer."
 656     (let ((obuf (current-buffer))
 657           beg)
 658       (goto-char (point-min))
 659       (search-forward-regexp "^\n" nil t)
 660       (setq beg (point))
 661     (with-current-buffer
 662        ;; Preserve the data's unibyteness (for url-insert-file-contents).
 663        (let ((default-enable-multibyte-characters (mm-multibyte-p)))
 664           (generate-new-buffer " *mm*"))
 665       (insert-buffer-substring obuf beg)
 666       (current-buffer))))
 667
 668 (defun mm-display-parts (handle &optional no-default)
 669   (if (stringp (car handle))
 670       (mapcar 'mm-display-parts (cdr handle))
 671     (if (bufferp (car handle))
 672         (save-restriction
 673           (narrow-to-region (point) (point))
 674           (mm-display-part handle)
 675           (goto-char (point-max)))
 676       (mapcar 'mm-display-parts handle))))
 677
 678 (defun mm-display-part (handle &optional no-default)
 679   "Display the MIME part represented by HANDLE.
 680 Returns nil if the part is removed; inline if displayed inline;
 681 external if displayed external."
 682   (save-excursion
 683     (mailcap-parse-mailcaps)
 684     (if (mm-handle-displayed-p handle)
 685         (mm-remove-part handle)
 686       (let* ((ehandle (if (equal (mm-handle-media-type handle)
 687                                  "message/external-body")
 688                           (progn
 689                             (unless (mm-handle-cache handle)
 690                               (mm-extern-cache-contents handle))
 691                             (mm-handle-cache handle))
 692                         handle))
 693              (type (mm-handle-media-type ehandle))
 694              (method (mailcap-mime-info type))
 695              (filename (or (mail-content-type-get
 696                             (mm-handle-disposition handle) 'filename)
 697                            (mail-content-type-get
 698                             (mm-handle-type handle) 'name)
 699                            "<file>"))
 700              (external mm-enable-external))
 701         (if (and (mm-inlinable-p ehandle)
 702                  (mm-inlined-p ehandle))
 703             (progn
 704               (forward-line 1)
 705               (mm-display-inline handle)
 706               'inline)
 707           (when (or method
 708                     (not no-default))
 709             (if (and (not method)
 710                      (equal "text" (car (split-string type "/"))))
 711                 (progn
 712                   (forward-line 1)
 713                   (mm-insert-inline handle (mm-get-part handle))
 714                   'inline)
 715               (setq external
 716                     (and method ;; If nil, we always use "save".
 717                        (stringp method) ;; 'mailcap-save-binary-file
 718                        (or (eq mm-enable-external t)
 719                            (and (eq mm-enable-external 'ask)
 720                                 (y-or-n-p
 721                                  (concat
 722                                   "Display part (" type
 723                                   ") using external program"
 724                                   ;; Can non-string method ever happen?
 725                                   (if (stringp method)
 726                                       (concat
 727                                        " \"" (format method filename) "\"")
 728                                     "")
 729                                     "? "))))))
 730               (if external
 731                   (mm-display-external
 732                    handle (or method 'mailcap-save-binary-file))
 733                 (mm-display-external
 734                  handle 'mailcap-save-binary-file)))))))))
 735
 736 (defun mm-display-external (handle method)
 737   "Display HANDLE using METHOD."
 738   (let ((outbuf (current-buffer)))
 739     (mm-with-unibyte-buffer
 740       (if (functionp method)
 741           (let ((cur (current-buffer)))
 742             (if (eq method 'mailcap-save-binary-file)
 743                 (progn
 744                   (set-buffer (generate-new-buffer " *mm*"))
 745                   (setq method nil))
 746               (mm-insert-part handle)
 747               (let ((win (get-buffer-window cur t)))
 748                 (when win
 749                   (select-window win)))
 750               (switch-to-buffer (generate-new-buffer " *mm*")))
 751             (buffer-disable-undo)
 752             (mm-set-buffer-file-coding-system mm-binary-coding-system)
 753             (insert-buffer-substring cur)
 754             (goto-char (point-min))
 755             (when method
 756               (message "Viewing with %s" method))
 757             (let ((mm (current-buffer))
 758                   (non-viewer (assq 'non-viewer
 759                                     (mailcap-mime-info
 760                                      (mm-handle-media-type handle) t))))
 761               (unwind-protect
 762                   (if method
 763                       (funcall method)
 764                     (mm-save-part handle))
 765                 (when (and (not non-viewer)
 766                            method)
 767                   (mm-handle-set-undisplayer handle mm)))))
 768         ;; The function is a string to be executed.
 769         (mm-insert-part handle)
 770         (let* ((dir (mm-make-temp-file
 771                      (expand-file-name "emm." mm-tmp-directory) 'dir))
 772                (filename (or
 773                           (mail-content-type-get
 774                            (mm-handle-disposition handle) 'filename)
 775                           (mail-content-type-get
 776                            (mm-handle-type handle) 'name)))
 777                (mime-info (mailcap-mime-info
 778                            (mm-handle-media-type handle) t))
 779                (needsterm (or (assoc "needsterm" mime-info)
 780                               (assoc "needsterminal" mime-info)))
 781                (copiousoutput (assoc "copiousoutput" mime-info))
 782                file buffer)
 783           ;; We create a private sub-directory where we store our files.
 784           (set-file-modes dir 448)
 785           (if filename
 786               (setq file (expand-file-name
 787                           (gnus-map-function mm-file-name-rewrite-functions
 788                                              (file-name-nondirectory filename))
 789                           dir))
 790             ;; Use nametemplate (defined in RFC1524) if it is specified
 791             ;; in mailcap.
 792             (let ((suffix (cdr (assoc "nametemplate" mime-info))))
 793               (if (and suffix
 794                        (string-match "\\`%s\\(\\..+\\)\\'" suffix))
 795                   (setq suffix (match-string 1 suffix))
 796                 ;; Otherwise, use a suffix according to
 797                 ;; `mailcap-mime-extensions'.
 798                 (setq suffix (car (rassoc (mm-handle-media-type handle)
 799                                           mailcap-mime-extensions))))
 800               (setq file (mm-make-temp-file (expand-file-name "mm." dir)
 801                                             nil suffix))))
 802           (let ((coding-system-for-write mm-binary-coding-system))
 803             (write-region (point-min) (point-max) file nil 'nomesg))
 804           (message "Viewing with %s" method)
 805           (cond
 806            (needsterm
 807             (let ((command (mm-mailcap-command
 808                             method file (mm-handle-type handle))))
 809               (unwind-protect
 810                   (if window-system
 811                       (start-process "*display*" nil
 812                                      mm-external-terminal-program
 813                                      "-e" shell-file-name
 814                                      shell-command-switch command)
 815                     (require 'term)
 816                     (require 'gnus-win)
 817                     (set-buffer
 818                      (setq buffer
 819                            (make-term "display"
 820                                       shell-file-name
 821                                       nil
 822                                       shell-command-switch command)))
 823                     (term-mode)
 824                     (term-char-mode)
 825                     (set-process-sentinel
 826                      (get-buffer-process buffer)
 827                      `(lambda (process state)
 828                         (if (eq 'exit (process-status process))
 829                             (gnus-configure-windows
 830                              ',gnus-current-window-configuration))))
 831                     (gnus-configure-windows 'display-term))
 832                 (mm-handle-set-external-undisplayer handle (cons file buffer)))
 833               (message "Displaying %s..." command))
 834             'external)
 835            (copiousoutput
 836             (with-current-buffer outbuf
 837               (forward-line 1)
 838               (mm-insert-inline
 839                handle
 840                (unwind-protect
 841                    (progn
 842                      (call-process shell-file-name nil
 843                                    (setq buffer
 844                                          (generate-new-buffer " *mm*"))
 845                                    nil
 846                                    shell-command-switch
 847                                    (mm-mailcap-command
 848                                     method file (mm-handle-type handle)))
 849                      (if (buffer-live-p buffer)
 850                          (with-current-buffer buffer
 851                            (buffer-string))))
 852                  (progn
 853                    (ignore-errors (delete-file file))
 854                    (ignore-errors (delete-directory
 855                                    (file-name-directory file)))
 856                    (ignore-errors (kill-buffer buffer))))))
 857             'inline)
 858            (t
 859             ;; Deleting the temp file should be postponed for some wrappers,
 860             ;; shell scripts, and so on, which might exit right after having
 861             ;; started a viewer command as a background job.
 862             (let ((command (mm-mailcap-command
 863                             method file (mm-handle-type handle))))
 864               (unwind-protect
 865                   (progn
 866                     (start-process "*display*"
 867                                    (setq buffer
 868                                          (generate-new-buffer " *mm*"))
 869                                    shell-file-name
 870                                    shell-command-switch command)
 871                     (set-process-sentinel
 872                      (get-buffer-process buffer)
 873                      (lexical-let ;; Don't use `let'.
 874                          ;; Function used to remove temp file and directory.
 875                          ((fn `(lambda nil
 876                                  ;; Don't use `ignore-errors'.
 877                                  (condition-case nil
 878                                      (delete-file ,file)
 879                                    (error))
 880                                  (condition-case nil
 881                                      (delete-directory
 882                                       ,(file-name-directory file))
 883                                    (error))))
 884                           ;; Form uses to kill the process buffer and
 885                           ;; remove the undisplayer.
 886                           (fm `(progn
 887                                  (kill-buffer ,buffer)
 888                                  ,(macroexpand
 889                                    (list 'mm-handle-set-undisplayer
 890                                          (list 'quote handle)
 891                                          nil))))
 892                           ;; Message to be issued when the process exits.
 893                           (done (format "Displaying %s...done" command))
 894                           ;; In particular, the timer object (which is
 895                           ;; a vector in Emacs but is a list in XEmacs)
 896                           ;; requires that it is lexically scoped.
 897                           (timer (run-at-time 2.0 nil 'ignore)))
 898                        (if (featurep 'xemacs)
 899                            (lambda (process state)
 900                              (when (eq 'exit (process-status process))
 901                                (if (memq timer itimer-list)
 902                                    (set-itimer-function timer fn)
 903                                  (funcall fn))
 904                                (ignore-errors (eval fm))
 905                                (message "%s" done)))
 906                          (lambda (process state)
 907                            (when (eq 'exit (process-status process))
 908                              (if (memq timer timer-list)
 909                                  (timer-set-function timer fn)
 910                                (funcall fn))
 911                              (ignore-errors (eval fm))
 912                              (message "%s" done)))))))
 913                 (mm-handle-set-external-undisplayer
 914                  handle (cons file buffer)))
 915               (message "Displaying %s..." command))
 916             'external)))))))
 917
 918 (defun mm-mailcap-command (method file type-list)
 919   (let ((ctl (cdr type-list))
 920         (beg 0)
 921         (uses-stdin t)
 922         out sub total)
 923     (while (string-match "%{\\([^}]+\\)}\\|'%s'\\|\"%s\"\\|%s\\|%t\\|%%"
 924                          method beg)
 925       (push (substring method beg (match-beginning 0)) out)
 926       (setq beg (match-end 0)
 927             total (match-string 0 method)
 928             sub (match-string 1 method))
 929       (cond
 930        ((string= total "%%")
 931         (push "%" out))
 932        ((or (string= total "%s")
 933             ;; We do our own quoting.
 934             (string= total "'%s'")
 935             (string= total "\"%s\""))
 936         (setq uses-stdin nil)
 937         (push (shell-quote-argument
 938                (gnus-map-function mm-path-name-rewrite-functions file)) out))
 939        ((string= total "%t")
 940         (push (shell-quote-argument (car type-list)) out))
 941        (t
 942         (push (shell-quote-argument (or (cdr (assq (intern sub) ctl)) "")) out))))
 943     (push (substring method beg (length method)) out)
 944     (when uses-stdin
 945       (push "<" out)
 946       (push (shell-quote-argument
 947              (gnus-map-function mm-path-name-rewrite-functions file))
 948             out))
 949     (mapconcat 'identity (nreverse out) "")))
 950
 951 (defun mm-remove-parts (handles)
 952   "Remove the displayed MIME parts represented by HANDLES."
 953   (if (and (listp handles)
 954            (bufferp (car handles)))
 955       (mm-remove-part handles)
 956     (let (handle)
 957       (while (setq handle (pop handles))
 958         (cond
 959          ((stringp handle)
 960           (when (buffer-live-p (get-text-property 0 'buffer handle))
 961             (kill-buffer (get-text-property 0 'buffer handle))))
 962          ((and (listp handle)
 963                (stringp (car handle)))
 964           (mm-remove-parts (cdr handle)))
 965          (t
 966           (mm-remove-part handle)))))))
 967
 968 (defun mm-destroy-parts (handles)
 969   "Remove the displayed MIME parts represented by HANDLES."
 970   (if (and (listp handles)
 971            (bufferp (car handles)))
 972       (mm-destroy-part handles)
 973     (let (handle)
 974       (while (setq handle (pop handles))
 975         (cond
 976          ((stringp handle)
 977           (when (buffer-live-p (get-text-property 0 'buffer handle))
 978             (kill-buffer (get-text-property 0 'buffer handle))))
 979          ((and (listp handle)
 980                (stringp (car handle)))
 981           (mm-destroy-parts handle))
 982          (t
 983           (mm-destroy-part handle)))))))
 984
 985 (defun mm-remove-part (handle)
 986   "Remove the displayed MIME part represented by HANDLE."
 987   (when (listp handle)
 988     (let ((object (mm-handle-undisplayer handle)))
 989       (ignore-errors
 990         (cond
 991          ;; Internally displayed part.
 992          ((mm-annotationp object)
 993           (delete-annotation object))
 994          ((or (functionp object)
 995               (and (listp object)
 996                    (eq (car object) 'lambda)))
 997           (funcall object))
 998          ;; Externally displayed part.
 999          ((consp object)
1000           (condition-case ()
1001               (while (get-buffer-process (cdr object))
1002                 (interrupt-process (get-buffer-process (cdr object)))
1003                 (message "Waiting for external displayer to die...")
1004                 (sit-for 1))
1005             (quit)
1006             (error))
1007           (ignore-errors (and (cdr object) (kill-buffer (cdr object))))
1008           (message "Waiting for external displayer to die...done")
1009           (ignore-errors (delete-file (car object)))
1010           (ignore-errors (delete-directory (file-name-directory
1011                                             (car object)))))
1012          ((bufferp object)
1013           (when (buffer-live-p object)
1014             (kill-buffer object)))))
1015       (mm-handle-set-undisplayer handle nil))))
1016
1017 (defun mm-display-inline (handle)
1018   (let* ((type (mm-handle-media-type handle))
1019          (function (cadr (mm-assoc-string-match mm-inline-media-tests type))))
1020     (funcall function handle)
1021     (goto-char (point-min))))
1022
1023 (defun mm-assoc-string-match (alist type)
1024   (dolist (elem alist)
1025     (when (string-match (car elem) type)
1026       (return elem))))
1027
1028 (defun mm-automatic-display-p (handle)
1029   "Say whether the user wants HANDLE to be displayed automatically."
1030   (let ((methods mm-automatic-display)
1031         (type (mm-handle-media-type handle))
1032         method result)
1033     (while (setq method (pop methods))
1034       (when (and (not (mm-inline-override-p handle))
1035                  (string-match method type))
1036         (setq result t
1037               methods nil)))
1038     result))
1039
1040 (defun mm-inlinable-p (handle &optional type)
1041   "Say whether HANDLE can be displayed inline.
1042 TYPE is the mime-type of the object; it defaults to the one given
1043 in HANDLE."
1044   (unless type (setq type (mm-handle-media-type handle)))
1045   (let ((alist mm-inline-media-tests)
1046         test)
1047     (while alist
1048       (when (string-match (caar alist) type)
1049         (setq test (caddar alist)
1050               alist nil)
1051         (setq test (funcall test handle)))
1052       (pop alist))
1053     test))
1054
1055 (defun mm-inlined-p (handle)
1056   "Say whether the user wants HANDLE to be displayed inline."
1057   (let ((methods mm-inlined-types)
1058         (type (mm-handle-media-type handle))
1059         method result)
1060     (while (setq method (pop methods))
1061       (when (and (not (mm-inline-override-p handle))
1062                  (string-match method type))
1063         (setq result t
1064               methods nil)))
1065     result))
1066
1067 (defun mm-attachment-override-p (handle)
1068   "Say whether HANDLE should have attachment behavior overridden."
1069   (let ((types mm-attachment-override-types)
1070         (type (mm-handle-media-type handle))
1071         ty)
1072     (catch 'found
1073       (while (setq ty (pop types))
1074         (when (and (string-match ty type)
1075                    (mm-inlinable-p handle))
1076           (throw 'found t))))))
1077
1078 (defun mm-inline-override-p (handle)
1079   "Say whether HANDLE should have inline behavior overridden."
1080   (let ((types mm-inline-override-types)
1081         (type (mm-handle-media-type handle))
1082         ty)
1083     (catch 'found
1084       (while (setq ty (pop types))
1085         (when (string-match ty type)
1086           (throw 'found t))))))
1087
1088 (defun mm-automatic-external-display-p (type)
1089   "Return the user-defined method for TYPE."
1090   (let ((methods mm-automatic-external-display)
1091         method result)
1092     (while (setq method (pop methods))
1093       (when (string-match method type)
1094         (setq result t
1095               methods nil)))
1096     result))
1097
1098 (defun mm-destroy-part (handle)
1099   "Destroy the data structures connected to HANDLE."
1100   (when (listp handle)
1101     (mm-remove-part handle)
1102     (when (buffer-live-p (mm-handle-buffer handle))
1103       (kill-buffer (mm-handle-buffer handle)))))
1104
1105 (defun mm-handle-displayed-p (handle)
1106   "Say whether HANDLE is displayed or not."
1107   (mm-handle-undisplayer handle))
1108
1109 ;;;
1110 ;;; Functions for outputting parts
1111 ;;;
1112
1113 (defmacro mm-with-part (handle &rest forms)
1114   "Run FORMS in the temp buffer containing the contents of HANDLE."
1115   `(let* ((handle ,handle)
1116           ;; The multibyteness of the temp buffer should be turned on
1117           ;; if inserting a multibyte string.  Contrarily, the buffer's
1118           ;; multibyteness should be off if inserting a unibyte string,
1119           ;; especially if a string contains 8bit data.
1120           (default-enable-multibyte-characters
1121             (with-current-buffer (mm-handle-buffer handle)
1122               (mm-multibyte-p))))
1123      (with-temp-buffer
1124        (insert-buffer-substring (mm-handle-buffer handle))
1125        (mm-disable-multibyte)
1126        (mm-decode-content-transfer-encoding
1127         (mm-handle-encoding handle)
1128         (mm-handle-media-type handle))
1129        ,@forms)))
1130 (put 'mm-with-part 'lisp-indent-function 1)
1131 (put 'mm-with-part 'edebug-form-spec '(body))
1132
1133 (defun mm-get-part (handle &optional no-cache)
1134   "Return the contents of HANDLE as a string.
1135 If NO-CACHE is non-nil, cached contents of a message/external-body part
1136 are ignored."
1137   (if (and (not no-cache)
1138            (equal (mm-handle-media-type handle) "message/external-body"))
1139       (progn
1140         (unless (mm-handle-cache handle)
1141           (mm-extern-cache-contents handle))
1142         (with-current-buffer (mm-handle-buffer (mm-handle-cache handle))
1143           (buffer-string)))
1144     (mm-with-part handle
1145       (buffer-string))))
1146
1147 (defun mm-insert-part (handle &optional no-cache)
1148   "Insert the contents of HANDLE in the current buffer.
1149 If NO-CACHE is non-nil, cached contents of a message/external-body part
1150 are ignored."
1151   (let ((text (cond ((eq (mail-content-type-get (mm-handle-type handle)
1152                                                 'charset)
1153                          'gnus-decoded)
1154                      (with-current-buffer (mm-handle-buffer handle)
1155                        (buffer-string)))
1156                     ((mm-multibyte-p)
1157                      (mm-string-to-multibyte (mm-get-part handle no-cache)))
1158                     (t
1159                      (mm-get-part handle no-cache)))))
1160     (save-restriction
1161       (widen)
1162       (goto-char
1163        (prog1
1164            (point)
1165          (if (and (eq (get-char-property (max (point-min) (1- (point))) 'face)
1166                       'mm-uu-extract)
1167                   (eq (get-char-property 0 'face text) 'mm-uu-extract))
1168              ;; Separate the extracted parts that have the same faces.
1169              (insert "\n" text)
1170            (insert text)))))))
1171
1172 (defun mm-file-name-delete-whitespace (file-name)
1173   "Remove all whitespace characters from FILE-NAME."
1174   (while (string-match "\\s-+" file-name)
1175     (setq file-name (replace-match "" t t file-name)))
1176   file-name)
1177
1178 (defun mm-file-name-trim-whitespace (file-name)
1179   "Remove leading and trailing whitespace characters from FILE-NAME."
1180   (when (string-match "\\`\\s-+" file-name)
1181     (setq file-name (substring file-name (match-end 0))))
1182   (when (string-match "\\s-+\\'" file-name)
1183     (setq file-name (substring file-name 0 (match-beginning 0))))
1184   file-name)
1185
1186 (defun mm-file-name-collapse-whitespace (file-name)
1187   "Collapse multiple whitespace characters in FILE-NAME."
1188   (while (string-match "\\s-\\s-+" file-name)
1189     (setq file-name (replace-match " " t t file-name)))
1190   file-name)
1191
1192 (defun mm-file-name-replace-whitespace (file-name)
1193   "Replace whitespace characters in FILE-NAME with underscores.
1194 Set the option `mm-file-name-replace-whitespace' to any other
1195 string if you do not like underscores."
1196   (let ((s (or mm-file-name-replace-whitespace "_")))
1197     (while (string-match "\\s-" file-name)
1198       (setq file-name (replace-match s t t file-name))))
1199   file-name)
1200
1201 (defun mm-file-name-delete-control (filename)
1202   "Delete control characters from FILENAME."
1203   (gnus-replace-in-string filename "[\x00-\x1f\x7f]" ""))
1204
1205 (defun mm-file-name-delete-gotchas (filename)
1206   "Delete shell gotchas from FILENAME."
1207   (setq filename (gnus-replace-in-string filename "[<>|]" ""))
1208   (gnus-replace-in-string filename "^[.-]+" ""))
1209
1210 (defun mm-save-part (handle &optional prompt)
1211   "Write HANDLE to a file.
1212 PROMPT overrides the default one used to ask user for a file name."
1213   (let ((filename (or (mail-content-type-get
1214                        (mm-handle-disposition handle) 'filename)
1215                       (mail-content-type-get
1216                        (mm-handle-type handle) 'name)))
1217         file)
1218     (when filename
1219       (setq filename (gnus-map-function mm-file-name-rewrite-functions
1220                                         (file-name-nondirectory filename))))
1221     (setq file
1222           (mm-with-multibyte
1223            (read-file-name (or prompt "Save MIME part to: ")
1224                            (or mm-default-directory default-directory)
1225                            nil nil (or filename ""))))
1226     (setq mm-default-directory (file-name-directory file))
1227     (and (or (not (file-exists-p file))
1228              (yes-or-no-p (format "File %s already exists; overwrite? "
1229                                   file)))
1230          (progn
1231            (mm-save-part-to-file handle file)
1232            file))))
1233
1234 (defun mm-save-part-to-file (handle file)
1235   (mm-with-unibyte-buffer
1236     (mm-insert-part handle)
1237     (let ((current-file-modes (default-file-modes)))
1238       (set-default-file-modes mm-attachment-file-modes)
1239       (unwind-protect
1240           ;; Don't re-compress .gz & al.  Arguably we should make
1241           ;; `file-name-handler-alist' nil, but that would chop
1242           ;; ange-ftp, which is reasonable to use here.
1243           (mm-write-region (point-min) (point-max) file nil nil nil 'binary t)
1244         (set-default-file-modes current-file-modes)))))
1245
1246 (defun mm-pipe-part (handle)
1247   "Pipe HANDLE to a process."
1248   (let* ((name (mail-content-type-get (mm-handle-type handle) 'name))
1249          (command
1250           (read-string "Shell command on MIME part: " mm-last-shell-command)))
1251     (mm-with-unibyte-buffer
1252       (mm-insert-part handle)
1253       (let ((coding-system-for-write 'binary))
1254         (shell-command-on-region (point-min) (point-max) command nil)))))
1255
1256 (defun mm-interactively-view-part (handle)
1257   "Display HANDLE using METHOD."
1258   (let* ((type (mm-handle-media-type handle))
1259          (methods
1260           (mapcar (lambda (i) (list (cdr (assoc 'viewer i))))
1261                   (mailcap-mime-info type 'all)))
1262          (method (let ((minibuffer-local-completion-map
1263                         mm-viewer-completion-map))
1264                    (completing-read "Viewer: " methods))))
1265     (when (string= method "")
1266       (error "No method given"))
1267     (if (string-match "^[^% \t]+$" method)
1268         (setq method (concat method " %s")))
1269     (mm-display-external handle method)))
1270
1271 (defun mm-preferred-alternative (handles &optional preferred)
1272   "Say which of HANDLES are preferred."
1273   (let ((prec (if preferred (list preferred)
1274                 (mm-preferred-alternative-precedence handles)))
1275         p h result type handle)
1276     (while (setq p (pop prec))
1277       (setq h handles)
1278       (while h
1279         (setq handle (car h))
1280         (setq type (mm-handle-media-type handle))
1281         (when (and (equal p type)
1282                    (mm-automatic-display-p handle)
1283                    (or (stringp (car handle))
1284                        (not (mm-handle-disposition handle))
1285                        (equal (car (mm-handle-disposition handle))
1286                               "inline")))
1287           (setq result handle
1288                 h nil
1289                 prec nil))
1290         (pop h)))
1291     result))
1292
1293 (defun mm-preferred-alternative-precedence (handles)
1294   "Return the precedence based on HANDLES and `mm-discouraged-alternatives'."
1295   (let ((seq (nreverse (mapcar #'mm-handle-media-type
1296                                handles))))
1297     (dolist (disc (reverse mm-discouraged-alternatives))
1298       (dolist (elem (copy-sequence seq))
1299         (when (string-match disc elem)
1300           (setq seq (nconc (delete elem seq) (list elem))))))
1301     seq))
1302
1303 (defun mm-get-content-id (id)
1304   "Return the handle(s) referred to by ID."
1305   (cdr (assoc id mm-content-id-alist)))
1306
1307 (defconst mm-image-type-regexps
1308   '(("/\\*.*XPM.\\*/" . xpm)
1309     ("P[1-6]" . pbm)
1310     ("GIF8" . gif)
1311     ("\377\330" . jpeg)
1312     ("\211PNG\r\n" . png)
1313     ("#define" . xbm)
1314     ("\\(MM\0\\*\\)\\|\\(II\\*\0\\)" . tiff)
1315     ("%!PS" . postscript))
1316   "Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
1317 When the first bytes of an image file match REGEXP, it is assumed to
1318 be of image type IMAGE-TYPE.")
1319
1320 ;; Steal from image.el. image-type-from-data suffers multi-line matching bug.
1321 (defun mm-image-type-from-buffer ()
1322   "Determine the image type from data in the current buffer.
1323 Value is a symbol specifying the image type or nil if type cannot
1324 be determined."
1325   (let ((types mm-image-type-regexps)
1326         type)
1327     (goto-char (point-min))
1328     (while (and types (null type))
1329       (let ((regexp (car (car types)))
1330             (image-type (cdr (car types))))
1331         (when (looking-at regexp)
1332           (setq type image-type))
1333         (setq types (cdr types))))
1334     type))
1335
1336 (defun mm-get-image (handle)
1337   "Return an image instance based on HANDLE."
1338   (let ((type (mm-handle-media-subtype handle))
1339         spec)
1340     ;; Allow some common translations.
1341     (setq type
1342           (cond
1343            ((equal type "x-pixmap")
1344             "xpm")
1345            ((equal type "x-xbitmap")
1346             "xbm")
1347            ((equal type "x-portable-bitmap")
1348             "pbm")
1349            (t type)))
1350     (or (mm-handle-cache handle)
1351         (mm-with-unibyte-buffer
1352           (mm-insert-part handle)
1353           (prog1
1354               (setq spec
1355                     (ignore-errors
1356                       ;; Avoid testing `make-glyph' since W3 may define
1357                       ;; a bogus version of it.
1358                       (if (fboundp 'create-image)
1359                           (create-image (buffer-string)
1360                                         (or (mm-image-type-from-buffer)
1361                                             (intern type))
1362                                         'data-p)
1363                         (mm-create-image-xemacs type))))
1364             (mm-handle-set-cache handle spec))))))
1365
1366 (defun mm-create-image-xemacs (type)
1367   (when (featurep 'xemacs)
1368     (cond
1369      ((equal type "xbm")
1370       ;; xbm images require special handling, since
1371       ;; the only way to create glyphs from these
1372       ;; (without a ton of work) is to write them
1373       ;; out to a file, and then create a file
1374       ;; specifier.
1375       (let ((file (mm-make-temp-file
1376                    (expand-file-name "emm" mm-tmp-directory)
1377                    nil ".xbm")))
1378         (unwind-protect
1379             (progn
1380               (write-region (point-min) (point-max) file)
1381               (make-glyph (list (cons 'x file))))
1382           (ignore-errors
1383             (delete-file file)))))
1384      (t
1385       (make-glyph
1386        (vector
1387         (or (mm-image-type-from-buffer)
1388             (intern type))
1389         :data (buffer-string)))))))
1390
1391 (defun mm-image-fit-p (handle)
1392   "Say whether the image in HANDLE will fit the current window."
1393   (let ((image (mm-get-image handle)))
1394     (or (not image)
1395         (if (featurep 'xemacs)
1396             ;; XEmacs' glyphs can actually tell us about their width, so
1397             ;; lets be nice and smart about them.
1398             (or mm-inline-large-images
1399                 (and (<= (glyph-width image) (window-pixel-width))
1400                      (<= (glyph-height image) (window-pixel-height))))
1401           (let* ((size (image-size image))
1402                  (w (car size))
1403                  (h (cdr size)))
1404             (or mm-inline-large-images
1405                 (and (<= h (1- (window-height))) ; Don't include mode line.
1406                      (<= w (window-width)))))))))
1407
1408 (defun mm-valid-image-format-p (format)
1409   "Say whether FORMAT can be displayed natively by Emacs."
1410   (cond
1411    ;; Handle XEmacs
1412    ((fboundp 'valid-image-instantiator-format-p)
1413     (valid-image-instantiator-format-p format))
1414    ;; Handle Emacs 21
1415    ((fboundp 'image-type-available-p)
1416     (and (display-graphic-p)
1417          (image-type-available-p format)))
1418    ;; Nobody else can do images yet.
1419    (t
1420     nil)))
1421
1422 (defun mm-valid-and-fit-image-p (format handle)
1423   "Say whether FORMAT can be displayed natively and HANDLE fits the window."
1424   (and (mm-valid-image-format-p format)
1425        (mm-image-fit-p handle)))
1426
1427 (defun mm-find-part-by-type (handles type &optional notp recursive)
1428   "Search in HANDLES for part with TYPE.
1429 If NOTP, returns first non-matching part.
1430 If RECURSIVE, search recursively."
1431   (let (handle)
1432     (while handles
1433       (if (and recursive (stringp (caar handles)))
1434           (if (setq handle (mm-find-part-by-type (cdar handles) type
1435                                                  notp recursive))
1436               (setq handles nil))
1437         (if (if notp
1438                 (not (equal (mm-handle-media-type (car handles)) type))
1439               (equal (mm-handle-media-type (car handles)) type))
1440             (setq handle (car handles)
1441                   handles nil)))
1442       (setq handles (cdr handles)))
1443     handle))
1444
1445 (defun mm-find-raw-part-by-type (ctl type &optional notp)
1446   (goto-char (point-min))
1447   (let* ((boundary (concat "--" (mm-handle-multipart-ctl-parameter ctl
1448                                                                    'boundary)))
1449          (close-delimiter (concat "^" (regexp-quote boundary) "--[ \t]*$"))
1450          start
1451          (end (save-excursion
1452                 (goto-char (point-max))
1453                 (if (re-search-backward close-delimiter nil t)
1454                     (match-beginning 0)
1455                   (point-max))))
1456          result)
1457     (setq boundary (concat "^" (regexp-quote boundary) "[ \t]*$"))
1458     (while (and (not result)
1459                 (re-search-forward boundary end t))
1460       (goto-char (match-beginning 0))
1461       (when start
1462         (save-excursion
1463           (save-restriction
1464             (narrow-to-region start (1- (point)))
1465             (when (let* ((ct (mail-fetch-field "content-type"))
1466                          (ctl (and ct (mail-header-parse-content-type ct))))
1467                     (if notp
1468                         (not (equal (car ctl) type))
1469                       (equal (car ctl) type)))
1470               (setq result (buffer-string))))))
1471       (forward-line 1)
1472       (setq start (point)))
1473     (when (and (not result) start)
1474       (save-excursion
1475         (save-restriction
1476           (narrow-to-region start end)
1477           (when (let* ((ct (mail-fetch-field "content-type"))
1478                        (ctl (and ct (mail-header-parse-content-type ct))))
1479                   (if notp
1480                       (not (equal (car ctl) type))
1481                     (equal (car ctl) type)))
1482             (setq result (buffer-string))))))
1483     result))
1484
1485 (defvar mm-security-handle nil)
1486
1487 (defsubst mm-set-handle-multipart-parameter (handle parameter value)
1488   ;; HANDLE could be a CTL.
1489   (when handle
1490     (put-text-property 0 (length (car handle)) parameter value
1491                        (car handle))))
1492
1493 (defun mm-possibly-verify-or-decrypt (parts ctl)
1494   (let ((type (car ctl))
1495         (subtype (cadr (split-string (car ctl) "/")))
1496         (mm-security-handle ctl) ;; (car CTL) is the type.
1497         protocol func functest)
1498     (cond
1499      ((or (equal type "application/x-pkcs7-mime")
1500           (equal type "application/pkcs7-mime"))
1501       (with-temp-buffer
1502         (when (and (cond
1503                     ((eq mm-decrypt-option 'never) nil)
1504                     ((eq mm-decrypt-option 'always) t)
1505                     ((eq mm-decrypt-option 'known) t)
1506                     (t (y-or-n-p
1507                         (format "Decrypt (S/MIME) part? "))))
1508                    (mm-view-pkcs7 parts))
1509           (setq parts (mm-dissect-buffer t)))))
1510      ((equal subtype "signed")
1511       (unless (and (setq protocol
1512                          (mm-handle-multipart-ctl-parameter ctl 'protocol))
1513                    (not (equal protocol "multipart/mixed")))
1514         ;; The message is broken or draft-ietf-openpgp-multsig-01.
1515         (let ((protocols mm-verify-function-alist))
1516           (while protocols
1517             (if (and (or (not (setq functest (nth 3 (car protocols))))
1518                          (funcall functest parts ctl))
1519                      (mm-find-part-by-type parts (caar protocols) nil t))
1520                 (setq protocol (caar protocols)
1521                       protocols nil)
1522               (setq protocols (cdr protocols))))))
1523       (setq func (nth 1 (assoc protocol mm-verify-function-alist)))
1524       (when (cond
1525              ((eq mm-verify-option 'never) nil)
1526              ((eq mm-verify-option 'always) t)
1527              ((eq mm-verify-option 'known)
1528               (and func
1529                    (or (not (setq functest
1530                                   (nth 3 (assoc protocol
1531                                                 mm-verify-function-alist))))
1532                        (funcall functest parts ctl))))
1533              (t
1534               (y-or-n-p
1535                (format "Verify signed (%s) part? "
1536                        (or (nth 2 (assoc protocol mm-verify-function-alist))
1537                            (format "protocol=%s" protocol))))))
1538         (save-excursion
1539           (if func
1540               (setq parts (funcall func parts ctl))
1541             (mm-set-handle-multipart-parameter
1542              mm-security-handle 'gnus-details
1543              (format "Unknown sign protocol (%s)" protocol))))))
1544      ((equal subtype "encrypted")
1545       (unless (setq protocol
1546                     (mm-handle-multipart-ctl-parameter ctl 'protocol))
1547         ;; The message is broken.
1548         (let ((parts parts))
1549           (while parts
1550             (if (assoc (mm-handle-media-type (car parts))
1551                        mm-decrypt-function-alist)
1552                 (setq protocol (mm-handle-media-type (car parts))
1553                       parts nil)
1554               (setq parts (cdr parts))))))
1555       (setq func (nth 1 (assoc protocol mm-decrypt-function-alist)))
1556       (when (cond
1557              ((eq mm-decrypt-option 'never) nil)
1558              ((eq mm-decrypt-option 'always) t)
1559              ((eq mm-decrypt-option 'known)
1560               (and func
1561                    (or (not (setq functest
1562                                   (nth 3 (assoc protocol
1563                                                 mm-decrypt-function-alist))))
1564                        (funcall functest parts ctl))))
1565              (t
1566               (y-or-n-p
1567                (format "Decrypt (%s) part? "
1568                        (or (nth 2 (assoc protocol mm-decrypt-function-alist))
1569                            (format "protocol=%s" protocol))))))
1570         (save-excursion
1571           (if func
1572               (setq parts (funcall func parts ctl))
1573             (mm-set-handle-multipart-parameter
1574              mm-security-handle 'gnus-details
1575              (format "Unknown encrypt protocol (%s)" protocol))))))
1576      (t nil))
1577     parts))
1578
1579 (defun mm-multiple-handles (handles)
1580   (and (listp handles)
1581        (> (length handles) 1)
1582        (or (listp (car handles))
1583            (stringp (car handles)))))
1584
1585 (defun mm-complicated-handles (handles)
1586   (and (listp (car handles))
1587        (> (length handles) 1)))
1588
1589 (defun mm-merge-handles (handles1 handles2)
1590   (append
1591    (if (listp (car handles1))
1592        handles1
1593      (list handles1))
1594    (if (listp (car handles2))
1595        handles2
1596      (list handles2))))
1597
1598 (defun mm-readable-p (handle)
1599   "Say whether the content of HANDLE is readable."
1600   (and (< (with-current-buffer (mm-handle-buffer handle)
1601             (buffer-size)) 10000)
1602        (mm-with-unibyte-buffer
1603          (mm-insert-part handle)
1604          (and (eq (mm-body-7-or-8) '7bit)
1605               (not (mm-long-lines-p 76))))))
1606
1607 (provide 'mm-decode)
1608
1609 ;; arch-tag: 4f35d360-56b8-4030-9388-3ed82d359b9b
1610 ;;; mm-decode.el ends here