-;;; mm-decode.el --- Function for decoding MIME things
-;; Copyright (C) 1998 Free Software Foundation, Inc.
+;;; mm-decode.el --- Functions for decoding MIME things
+;; Copyright (C) 1998,99 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
-;; This file is not yet part of GNU Emacs.
+;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;;; Code:
-(require 'base64)
-(require 'qp)
-(require 'nnheader)
+(require 'mail-parse)
+(require 'mailcap)
+(require 'mm-bodies)
-(defvar mm-charset-regexp (concat "[^" "][\000-\040()<>@,\;:\\\"/?.=" "]+"))
+;;; Convenience macros.
-(defvar mm-encoded-word-regexp
- (concat "=\\?\\(" mm-charset-regexp "\\)\\?\\(B\\|Q\\)\\?"
- "\\([!->@-~]+\\)\\?="))
+(defmacro mm-handle-buffer (handle)
+ `(nth 0 ,handle))
+(defmacro mm-handle-type (handle)
+ `(nth 1 ,handle))
+(defmacro mm-handle-encoding (handle)
+ `(nth 2 ,handle))
+(defmacro mm-handle-undisplayer (handle)
+ `(nth 3 ,handle))
+(defmacro mm-handle-set-undisplayer (handle function)
+ `(setcar (nthcdr 3 ,handle) ,function))
+(defmacro mm-handle-disposition (handle)
+ `(nth 4 ,handle))
+(defmacro mm-handle-description (handle)
+ `(nth 5 ,handle))
+(defmacro mm-handle-cache (handle)
+ `(nth 6 ,handle))
+(defmacro mm-handle-set-cache (handle contents)
+ `(setcar (nthcdr 6 ,handle) ,contents))
+(defmacro mm-handle-id (handle)
+ `(nth 7 ,handle))
+(defmacro mm-make-handle (&optional buffer type encoding undisplayer
+ disposition description cache
+ id)
+ `(list ,buffer ,type ,encoding ,undisplayer
+ ,disposition ,description ,cache ,id))
-(defun mm-decode-words-region (start end)
- "Decode MIME-encoded words in region between START and END."
- (interactive "r")
+(defvar mm-inline-media-tests
+ '(("image/jpeg" mm-inline-image (mm-valid-and-fit-image-p 'jpeg handle))
+ ("image/png" mm-inline-image (mm-valid-and-fit-image-p 'png handle))
+ ("image/gif" mm-inline-image (mm-valid-and-fit-image-p 'gif handle))
+ ("image/tiff" mm-inline-image (mm-valid-and-fit-image-p 'tiff handle))
+ ("image/xbm" mm-inline-image (mm-valid-and-fit-image-p 'xbm handle))
+ ("image/x-xbitmap" mm-inline-image (mm-valid-and-fit-image-p 'xbm handle))
+ ("image/xpm" mm-inline-image (mm-valid-and-fit-image-p 'xpm handle))
+ ("image/x-pixmap" mm-inline-image (mm-valid-and-fit-image-p 'xpm handle))
+ ("image/bmp" mm-inline-image (mm-valid-and-fit-image-p 'bmp handle))
+ ("text/plain" mm-inline-text t)
+ ("text/enriched" mm-inline-text t)
+ ("text/richtext" mm-inline-text t)
+ ("text/html" mm-inline-text (locate-library "w3"))
+ ("text/x-vcard" mm-inline-text (locate-library "vcard"))
+ ("message/delivery-status" mm-inline-text t)
+ ("message/rfc822" mm-inline-message t)
+ ("text/.*" mm-inline-text t)
+ ("audio/wav" mm-inline-audio
+ (and (or (featurep 'nas-sound) (featurep 'native-sound))
+ (device-sound-enabled-p)))
+ ("audio/au" mm-inline-audio
+ (and (or (featurep 'nas-sound) (featurep 'native-sound))
+ (device-sound-enabled-p)))
+ ("multipart/alternative" ignore t)
+ ("multipart/mixed" ignore t)
+ ("multipart/related" ignore t))
+ "Alist of media types/test that say whether the media types can be displayed inline.")
+
+(defvar mm-inlined-types
+ '("image/.*" "text/.*" "message/delivery-status" "message/rfc822")
+ "List of media types that are to be displayed inline.")
+
+(defvar mm-automatic-display
+ '("text/plain" "text/enriched" "text/richtext" "text/html"
+ "text/x-vcard" "image/.*" "message/delivery-status" "multipart/.*"
+ "message/rfc822")
+ "A list of MIME types to be displayed automatically.")
+
+(defvar mm-attachment-override-types
+ '("text/plain" "text/x-vcard")
+ "Types that should have \"attachment\" ignored if they can be displayed inline.")
+
+(defvar mm-automatic-external-display nil
+ "List of MIME type regexps that will be displayed externally automatically.")
+
+(defvar mm-discouraged-alternatives nil
+ "List of MIME types that are discouraged when viewing multipart/alternative.
+Viewing agents are supposed to view the last possible part of a message,
+as that is supposed to be the richest. However, users may prefer other
+types instead, and this list says what types are most unwanted. If,
+for instance, text/html parts are very unwanted, and text/richtech are
+somewhat unwanted, then the value of this variable should be set
+to:
+
+ (\"text/html\" \"text/richtext\")")
+
+(defvar mm-tmp-directory
+ (cond ((fboundp 'temp-directory) (temp-directory))
+ ((boundp 'temporary-file-directory) temporary-file-directory)
+ ("/tmp/"))
+ "Where mm will store its temporary files.")
+
+(defvar mm-all-images-fit nil
+ "If non-nil, then all images fit in the buffer.")
+
+;;; Internal variables.
+
+(defvar mm-dissection-list nil)
+(defvar mm-last-shell-command "")
+(defvar mm-content-id-alist nil)
+
+;;; The functions.
+
+(defun mm-dissect-buffer (&optional no-strict-mime)
+ "Dissect the current buffer and return a list of MIME handles."
(save-excursion
- (save-restriction
- (narrow-to-region start end)
- (goto-char (point-min))
- ;; Remove whitespace between encoded words.
- (while (re-search-forward
- (concat "\\(" mm-encoded-word-regexp "\\)"
- "\\(\n?[ \t]\\)+"
- "\\(" mm-encoded-word-regexp "\\)")
- nil t)
- (delete-region (goto-char (match-end 1)) (match-beginning 6)))
- ;; Decode the encoded words.
+ (let (ct ctl type subtype cte cd description id result)
+ (save-restriction
+ (mail-narrow-to-head)
+ (when (or no-strict-mime
+ (mail-fetch-field "mime-version"))
+ (setq ct (mail-fetch-field "content-type")
+ ctl (ignore-errors (mail-header-parse-content-type ct))
+ cte (mail-fetch-field "content-transfer-encoding")
+ cd (mail-fetch-field "content-disposition")
+ description (mail-fetch-field "content-description")
+ id (mail-fetch-field "content-id"))))
+ (if (or (not ctl)
+ (not (string-match "/" (car ctl))))
+ (mm-dissect-singlepart
+ '("text/plain") nil no-strict-mime
+ (and cd (ignore-errors (mail-header-parse-content-disposition cd)))
+ description)
+ (setq type (split-string (car ctl) "/"))
+ (setq subtype (cadr type)
+ type (pop type))
+ (setq
+ result
+ (cond
+ ((equal type "multipart")
+ (cons (car ctl) (mm-dissect-multipart ctl)))
+ (t
+ (mm-dissect-singlepart
+ ctl
+ (and cte (intern (downcase (mail-header-remove-whitespace
+ (mail-header-remove-comments
+ cte)))))
+ no-strict-mime
+ (and cd (ignore-errors (mail-header-parse-content-disposition cd)))
+ description id))))
+ (when id
+ (when (string-match " *<\\(.*\\)> *" id)
+ (setq id (match-string 1 id)))
+ (push (cons id result) mm-content-id-alist))
+ result))))
+
+(defun mm-dissect-singlepart (ctl cte &optional force cdl description id)
+ (when (or force
+ (not (equal "text/plain" (car ctl))))
+ (let ((res (mm-make-handle
+ (mm-copy-to-buffer) ctl cte nil cdl description nil id)))
+ (push (car res) mm-dissection-list)
+ res)))
+
+(defun mm-remove-all-parts ()
+ "Remove all MIME handles."
+ (interactive)
+ (mapcar 'mm-remove-part mm-dissection-list)
+ (setq mm-dissection-list nil))
+
+(defun mm-dissect-multipart (ctl)
+ (goto-char (point-min))
+ (let* ((boundary (concat "\n--" (mail-content-type-get ctl 'boundary)))
+ (close-delimiter (concat (regexp-quote boundary) "--[ \t]*$"))
+ start parts
+ (end (save-excursion
+ (goto-char (point-max))
+ (if (re-search-backward close-delimiter nil t)
+ (match-beginning 0)
+ (point-max)))))
+ (while (search-forward boundary end t)
+ (goto-char (match-beginning 0))
+ (when start
+ (save-excursion
+ (save-restriction
+ (narrow-to-region start (point))
+ (setq parts (nconc (list (mm-dissect-buffer t)) parts)))))
+ (forward-line 2)
+ (setq start (point)))
+ (when start
+ (save-excursion
+ (save-restriction
+ (narrow-to-region start end)
+ (setq parts (nconc (list (mm-dissect-buffer t)) parts)))))
+ (nreverse parts)))
+
+(defun mm-copy-to-buffer ()
+ "Copy the contents of the current buffer to a fresh buffer."
+ (save-excursion
+ (let ((obuf (current-buffer))
+ beg)
(goto-char (point-min))
- (while (re-search-forward mm-encoded-word-regexp nil t)
- (insert (mm-decode-word
- (prog1
- (match-string 0)
- (delete-region (match-beginning 0) (match-end 0)))))))))
-
-(defun mm-decode-words-string (string)
- "Decode the quoted-printable-encoded STRING and return the results."
- (with-temp-buffer
- (insert string)
- (inline
- (mm-decode-words-region (point-min) (point-max)))
- (buffer-string)))
-
-(defun mm-decode-word (word)
- "Decode WORD and return it if it is an encoded word.
-Return WORD if not."
- (if (not (string-match mm-encoded-word-regexp word))
- word
- (or
- (condition-case nil
- (mm-decode-text
- (match-string 1 word)
- (upcase (match-string 2 word))
- (match-string 3 word))
- (error word))
- word)))
-
-(eval-and-compile
- (if (fboundp 'decode-coding-string)
- (fset 'mm-decode-coding-string 'decode-coding-string)
- (fset 'mm-decode-coding-string (lambda (s a) s))))
-
-(defun mm-decode-text (charset encoding string)
- "Decode STRING as an encoded text.
-Valid ENCODINGs are \"B\" and \"Q\".
-If your Emacs implementation can't decode CHARSET, it returns nil."
- (let ((cs (mm-charset-to-coding-system charset)))
- (when cs
- (mm-decode-coding-string
- (cond
- ((equal "B" encoding)
- (base64-decode string))
- ((equal "Q" encoding)
- (quoted-printable-decode-string
- (nnheader-replace-chars-in-string string ?_ ? )))
- (t (error "Invalid encoding: %s" encoding)))
- cs))))
-
-(defvar mm-charset-coding-system-alist
- (let ((rest
- '((us-ascii . iso-8859-1)
- (gb2312 . cn-gb-2312)
- (iso-2022-jp-2 . iso-2022-7bit-ss2)
- (x-ctext . ctext)))
- (systems (coding-system-list))
- dest)
- (while rest
- (let ((pair (car rest)))
- (unless (memq (car pair) systems)
- (setq dest (cons pair dest))))
- (setq rest (cdr rest)))
- dest)
- "Charset/coding system alist.")
-
-(defun mm-charset-to-coding-system (charset &optional lbt)
- "Return coding-system corresponding to CHARSET.
-CHARSET is a symbol naming a MIME charset.
-If optional argument LBT (`unix', `dos' or `mac') is specified, it is
-used as the line break code type of the coding system."
- (when (stringp charset)
- (setq charset (intern (downcase charset))))
- (setq charset
- (or (cdr (assq charset mm-charset-coding-system-alist))
- charset))
- (when lbt
- (setq charset (intern (format "%s-%s" charset lbt))))
- (when (memq charset (coding-system-list))
- charset))
+ (search-forward-regexp "^\n" nil t)
+ (setq beg (point))
+ (set-buffer (generate-new-buffer " *mm*"))
+ (insert-buffer-substring obuf beg)
+ (current-buffer))))
+
+(defun mm-display-part (handle &optional no-default)
+ "Display the MIME part represented by HANDLE.
+Returns nil if the part is removed; inline if displayed inline;
+external if displayed external."
+ (save-excursion
+ (mailcap-parse-mailcaps)
+ (if (mm-handle-displayed-p handle)
+ (mm-remove-part handle)
+ (let* ((type (car (mm-handle-type handle)))
+ (method (mailcap-mime-info type)))
+ (if (mm-inlined-p type)
+ (progn
+ (forward-line 1)
+ (mm-display-inline handle)
+ 'inline)
+ (when (or method
+ (not no-default))
+ (if (and (not method)
+ (equal "text" (car (split-string type))))
+ (progn
+ (forward-line 1)
+ (mm-insert-inline handle (mm-get-part handle))
+ 'inline)
+ (mm-display-external
+ handle (or method 'mailcap-save-binary-file))
+ 'external)))))))
+
+(defun mm-display-external (handle method)
+ "Display HANDLE using METHOD."
+ (mm-with-unibyte-buffer
+ (if (functionp method)
+ (let ((cur (current-buffer)))
+ (if (eq method 'mailcap-save-binary-file)
+ (progn
+ (set-buffer (generate-new-buffer "*mm*"))
+ (setq method nil))
+ (mm-insert-part handle)
+ (let ((win (get-buffer-window cur t)))
+ (when win
+ (select-window win)))
+ (switch-to-buffer (generate-new-buffer "*mm*")))
+ (buffer-disable-undo)
+ (mm-set-buffer-file-coding-system mm-binary-coding-system)
+ (insert-buffer-substring cur)
+ (message "Viewing with %s" method)
+ (let ((mm (current-buffer))
+ (non-viewer (assoc "non-viewer"
+ (mailcap-mime-info
+ (car (mm-handle-type handle)) t))))
+ (unwind-protect
+ (if method
+ (funcall method)
+ (mm-save-part handle))
+ (when (and (not non-viewer)
+ method)
+ (mm-handle-set-undisplayer handle mm)))))
+ ;; The function is a string to be executed.
+ (mm-insert-part handle)
+ (let* ((dir (make-temp-name (expand-file-name "emm." mm-tmp-directory)))
+ (filename (mail-content-type-get
+ (mm-handle-disposition handle) 'filename))
+ (needsterm (assoc "needsterm"
+ (mailcap-mime-info
+ (car (mm-handle-type handle)) t)))
+ process file buffer)
+ ;; We create a private sub-directory where we store our files.
+ (make-directory dir)
+ (set-file-modes dir 448)
+ (if filename
+ (setq file (expand-file-name (file-name-nondirectory filename)
+ dir))
+ (setq file (make-temp-name (expand-file-name "mm." dir))))
+ (write-region (point-min) (point-max) file nil 'nomesg)
+ (message "Viewing with %s" method)
+ (unwind-protect
+ (setq process
+ (if needsterm
+ (start-process "*display*" nil
+ "xterm"
+ "-e" shell-file-name "-c"
+ (format method
+ (mm-quote-arg file)))
+ (start-process "*display*"
+ (setq buffer (generate-new-buffer "*mm*"))
+ shell-file-name
+ "-c" (format method
+ (mm-quote-arg file)))))
+ (mm-handle-set-undisplayer handle (cons file buffer)))
+ (message "Displaying %s..." (format method file))))))
+
+(defun mm-remove-parts (handles)
+ "Remove the displayed MIME parts represented by HANDLE."
+ (if (and (listp handles)
+ (bufferp (car handles)))
+ (mm-remove-part handles)
+ (let (handle)
+ (while (setq handle (pop handles))
+ (cond
+ ((stringp handle)
+ )
+ ((and (listp handle)
+ (stringp (car handle)))
+ (mm-remove-parts (cdr handle)))
+ (t
+ (mm-remove-part handle)))))))
+
+(defun mm-destroy-parts (handles)
+ "Remove the displayed MIME parts represented by HANDLE."
+ (if (and (listp handles)
+ (bufferp (car handles)))
+ (mm-destroy-part handles)
+ (let (handle)
+ (while (setq handle (pop handles))
+ (cond
+ ((stringp handle)
+ )
+ ((and (listp handle)
+ (stringp (car handle)))
+ (mm-destroy-parts (cdr handle)))
+ (t
+ (mm-destroy-part handle)))))))
+
+(defun mm-remove-part (handle)
+ "Remove the displayed MIME part represented by HANDLE."
+ (when (listp handle)
+ (let ((object (mm-handle-undisplayer handle)))
+ (ignore-errors
+ (cond
+ ;; Internally displayed part.
+ ((mm-annotationp object)
+ (delete-annotation object))
+ ((or (functionp object)
+ (and (listp object)
+ (eq (car object) 'lambda)))
+ (funcall object))
+ ;; Externally displayed part.
+ ((consp object)
+ (ignore-errors (delete-file (car object)))
+ (ignore-errors (delete-directory (file-name-directory (car object))))
+ (ignore-errors (kill-buffer (cdr object))))
+ ((bufferp object)
+ (when (buffer-live-p object)
+ (kill-buffer object)))))
+ (mm-handle-set-undisplayer handle nil))))
+
+(defun mm-display-inline (handle)
+ (let* ((type (car (mm-handle-type handle)))
+ (function (cadr (assoc type mm-inline-media-tests))))
+ (funcall function handle)
+ (goto-char (point-min))))
+
+(defun mm-inlinable-p (type)
+ "Say whether TYPE can be displayed inline."
+ (let ((alist mm-inline-media-tests)
+ test)
+ (while alist
+ (when (equal type (caar alist))
+ (setq test (caddar alist)
+ alist nil)
+ (setq test (eval test)))
+ (pop alist))
+ test))
+
+(defun mm-automatic-display-p (type)
+ "Say whether the user wants TYPE to be displayed automatically."
+ (let ((methods mm-automatic-display)
+ method result)
+ (while (setq method (pop methods))
+ (when (and (string-match method type)
+ (mm-inlinable-p type))
+ (setq result t
+ methods nil)))
+ result))
+
+(defun mm-inlined-p (type)
+ "Say whether the user wants TYPE to be displayed automatically."
+ (let ((methods mm-inlined-types)
+ method result)
+ (while (setq method (pop methods))
+ (when (and (string-match method type)
+ (mm-inlinable-p type))
+ (setq result t
+ methods nil)))
+ result))
+
+(defun mm-attachment-override-p (type)
+ "Say whether TYPE should have attachment behavior overridden."
+ (let ((types mm-attachment-override-types)
+ ty)
+ (catch 'found
+ (while (setq ty (pop types))
+ (when (and (string-match ty type)
+ (mm-inlinable-p type))
+ (throw 'found t))))))
+
+(defun mm-automatic-external-display-p (type)
+ "Return the user-defined method for TYPE."
+ (let ((methods mm-automatic-external-display)
+ method result)
+ (while (setq method (pop methods))
+ (when (string-match method type)
+ (setq result t
+ methods nil)))
+ result))
+
+(defun mm-destroy-part (handle)
+ "Destroy the data structures connected to HANDLE."
+ (when (listp handle)
+ (mm-remove-part handle)
+ (when (buffer-live-p (mm-handle-buffer handle))
+ (kill-buffer (mm-handle-buffer handle)))))
+
+(defun mm-handle-displayed-p (handle)
+ "Say whether HANDLE is displayed or not."
+ (mm-handle-undisplayer handle))
+
+;;;
+;;; Functions for outputting parts
+;;;
+
+(defun mm-get-part (handle)
+ "Return the contents of HANDLE as a string."
+ (mm-with-unibyte-buffer
+ (mm-insert-part handle)
+ (buffer-string)))
+
+(defun mm-insert-part (handle)
+ "Insert the contents of HANDLE in the current buffer."
+ (let ((cur (current-buffer)))
+ (save-excursion
+ (if (member (car (split-string (car (mm-handle-type handle)) "/"))
+ '("text" "message"))
+ (with-temp-buffer
+ (insert-buffer-substring (mm-handle-buffer handle))
+ (mm-decode-content-transfer-encoding
+ (mm-handle-encoding handle)
+ (car (mm-handle-type handle)))
+ (let ((temp (current-buffer)))
+ (set-buffer cur)
+ (insert-buffer-substring temp)))
+ (mm-with-unibyte-buffer
+ (insert-buffer-substring (mm-handle-buffer handle))
+ (mm-decode-content-transfer-encoding
+ (mm-handle-encoding handle)
+ (car (mm-handle-type handle)))
+ (let ((temp (current-buffer)))
+ (set-buffer cur)
+ (insert-buffer-substring temp)))))))
+
+(defvar mm-default-directory nil)
+
+(defun mm-save-part (handle)
+ "Write HANDLE to a file."
+ (let* ((name (mail-content-type-get (mm-handle-type handle) 'name))
+ (filename (mail-content-type-get
+ (mm-handle-disposition handle) 'filename))
+ file)
+ (when filename
+ (setq filename (file-name-nondirectory filename)))
+ (setq file
+ (read-file-name "Save MIME part to: "
+ (expand-file-name
+ (or filename name "")
+ (or mm-default-directory default-directory))))
+ (setq mm-default-directory (file-name-directory file))
+ (when (or (not (file-exists-p file))
+ (yes-or-no-p (format "File %s already exists; overwrite? "
+ file)))
+ (mm-save-part-to-file handle file))))
+
+(defun mm-save-part-to-file (handle file)
+ (mm-with-unibyte-buffer
+ (mm-insert-part handle)
+ ;; Now every coding system is 100% binary within mm-with-unibyte-buffer
+ ;; Is text still special?
+ (let ((coding-system-for-write
+ (if (equal "text" (car (split-string
+ (car (mm-handle-type handle)) "/")))
+ buffer-file-coding-system
+ 'binary))
+ ;; Don't re-compress .gz & al. Arguably we should make
+ ;; `file-name-handler-alist' nil, but that would chop
+ ;; ange-ftp which it's reasonable to use here.
+ (inhibit-file-name-operation 'write-region)
+ (inhibit-file-name-handlers
+ (if (equal (car (mm-handle-type handle))
+ "application/octet-stream")
+ (cons 'jka-compr-handler inhibit-file-name-handlers)
+ inhibit-file-name-handlers)))
+ (write-region (point-min) (point-max) file))))
+
+(defun mm-pipe-part (handle)
+ "Pipe HANDLE to a process."
+ (let* ((name (mail-content-type-get (mm-handle-type handle) 'name))
+ (command
+ (read-string "Shell command on MIME part: " mm-last-shell-command)))
+ (mm-with-unibyte-buffer
+ (mm-insert-part handle)
+ (shell-command-on-region (point-min) (point-max) command nil))))
+
+(defun mm-interactively-view-part (handle)
+ "Display HANDLE using METHOD."
+ (let* ((type (car (mm-handle-type handle)))
+ (methods
+ (mapcar (lambda (i) (list (cdr (assoc 'viewer i))))
+ (mailcap-mime-info type 'all)))
+ (method (completing-read "Viewer: " methods)))
+ (mm-display-external (copy-sequence handle) method)))
+
+(defun mm-preferred-alternative (handles &optional preferred)
+ "Say which of HANDLES are preferred."
+ (let ((prec (if preferred (list preferred)
+ (mm-preferred-alternative-precedence handles)))
+ p h result type handle)
+ (while (setq p (pop prec))
+ (setq h handles)
+ (while h
+ (setq type
+ (if (stringp (caar h))
+ (caar h)
+ (car (mm-handle-type (car h)))))
+ (setq handle (car h))
+ (when (and (equal p type)
+ (mm-automatic-display-p type)
+ (or (stringp (caar h))
+ (not (mm-handle-disposition (car h)))
+ (equal (car (mm-handle-disposition (car h)))
+ "inline")))
+ (setq result (car h)
+ h nil
+ prec nil))
+ (pop h)))
+ result))
+
+(defun mm-preferred-alternative-precedence (handles)
+ "Return the precedence based on HANDLES and mm-discouraged-alternatives."
+ (let ((seq (nreverse (mapcar (lambda (h)
+ (car (mm-handle-type h))) handles))))
+ (dolist (disc (reverse mm-discouraged-alternatives))
+ (dolist (elem (copy-sequence seq))
+ (when (string-match disc elem)
+ (setq seq (nconc (delete elem seq) (list elem))))))
+ seq))
+
+(defun mm-get-content-id (id)
+ "Return the handle(s) referred to by ID."
+ (cdr (assoc id mm-content-id-alist)))
+
+(defun mm-get-image (handle)
+ "Return an image instance based on HANDLE."
+ (let ((type (cadr (split-string (car (mm-handle-type handle)) "/")))
+ spec)
+ ;; Allow some common translations.
+ (setq type
+ (cond
+ ((equal type "x-pixmap")
+ "xpm")
+ ((equal type "x-xbitmap")
+ "xbm")
+ (t type)))
+ (or (mm-handle-cache handle)
+ (mm-with-unibyte-buffer
+ (mm-insert-part handle)
+ (prog1
+ (setq spec
+ (ignore-errors
+ (cond
+ ((equal type "xbm")
+ ;; xbm images require special handling, since
+ ;; the only way to create glyphs from these
+ ;; (without a ton of work) is to write them
+ ;; out to a file, and then create a file
+ ;; specifier.
+ (let ((file (make-temp-name
+ (expand-file-name "emm.xbm"
+ mm-tmp-directory))))
+ (unwind-protect
+ (progn
+ (write-region (point-min) (point-max) file)
+ (make-glyph (list (cons 'x file))))
+ (ignore-errors
+ (delete-file file)))))
+ (t
+ (make-glyph
+ (vector (intern type) :data (buffer-string)))))))
+ (mm-handle-set-cache handle spec))))))
+
+(defun mm-image-fit-p (handle)
+ "Say whether the image in HANDLE will fit the current window."
+ (let ((image (mm-get-image handle)))
+ (or mm-all-images-fit
+ (and (< (glyph-width image) (window-pixel-width))
+ (< (glyph-height image) (window-pixel-height))))))
+
+(defun mm-valid-image-format-p (format)
+ "Say whether FORMAT can be displayed natively by Emacs."
+ (and (fboundp 'valid-image-instantiator-format-p)
+ (valid-image-instantiator-format-p format)))
+
+(defun mm-valid-and-fit-image-p (format handle)
+ "Say whether FORMAT can be displayed natively and HANDLE fits the window."
+ (and window-system
+ (mm-valid-image-format-p format)
+ (mm-image-fit-p handle)))
(provide 'mm-decode)
-;; qp.el ends here
+;; mm-decode.el ends here
projects / elisp / gnus.git- / blobdiff