/usr/share/emacs/site-lisp/w3m/octet.el is in w3m-el 1.4.4-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 2000, 2002, 2003, 2004, 2005
;; Yuuichi Teranishi <teranisi@gohome.org>
;; Author: Yuuichi Teranishi <teranisi@gohome.org>
;; Created: 2000/05/19
;; Keywords: octet-stream, broken document
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;; Display application/octet-stream inline on the emacs buffer.
;;
;; This program requires:
;;
;; emacs-w3m for HTML rendereing.
;; (http://emacs-w3m.namazu.org/)
;; Mule-UCS for UTF-8 decoding.
;; (ftp://ftp.m17n.org/pub/mule/Mule-UCS/)
;; wvHtml for MS Word document.
;; (http://www.wvware.com/)
;; xlHtml for MS Excel document.
;; (http://chicago.sourceforge.net/xlhtml/)
;; pptHtml for MS PowerPoint document.
;; (http://chicago.sourceforge.net/xlhtml/)
;; gunzip for decoding gzipped file.
;; bunzip2 for decoding bzip2ed file.
;; Put follwing line in your setting file:
;;
;; (require 'octet)
;;
;; To display octet data file, execute following command.
;;
;; M-x octet-find-file
;;
;; If you use SEMI, put following lines in your setting file:
;;
;; (require 'octet)
;; (octet-mime-setup)
;;
;; Then you can toggle displaying application/octet-stream messages.
;;; History:
;;
;; This file is created in 2000/05/19.
;; All part was rewrote in 2002/01/28.
;; Added to emacs-w3m repository in 2002/01/29.
;;; Code:
(eval-when-compile
(require 'cl))
(require 'poe) ; for compatibility
(require 'pces) ; as-binary-process
(require 'mime) ; SEMI
(require 'static)
(require 'w3m-util); w3m-insert-string
(defvar octet-temp-directory temporary-file-directory
"A directory to create temporal files.")
(defvar octet-html-render-function 'octet-w3m-region
"A function for HTML rendering.")
(defvar octet-suffix-type-alist
'(("xls" . msexcel)
("ppt" . msppt)
("doc" . msword)
("gz" . gzip)
("bz2" . bzip2)
("html" . html)
("jpg" . jpeg)
("jpeg" . jpeg)
("gif" . gif)
("png" . png)
("tif" . tiff)
("tiff" . tiff)
("txt" . text)
("lzh" . lzh)
("tar" . tar)
("pdf" . pdf))
"Alist of suffix-to-octet-type.")
(defvar octet-content-type-alist
'(("application/vnd\\.ms-excel" . msexcel)
("application/vnd\\.ms-powerpoint" . msppt)
("application/x-msexcel" . msexcel)
("application/msword" . msword)
("image/jpeg" . jpeg)
("image/gif" . gif)
("image/png" . png)
("image/tiff" . tiff)
("audio/midi" . ignore)
("video/mpeg" . ignore)
("text/html" . html-un)
("application/x-tar" . tar)
("application/pdf" . pdf))
"Alist of content-type-regexp-to-octet-type.")
(defvar octet-magic-type-alist
'(("^\377\330\377[\340\356]..JFIF" image jpeg)
("^\211PNG" image png)
("^GIF8[79]" image gif)
("^II\\*\000" image tiff)
("^MM\000\\*" image tiff)
("^MThd" audio midi)
("^\000\000\001\263" video mpeg)
("^<!doctype html" text html)
("^<head" text html)
("^<title" text html)
("^<html" text html))
"*Alist of regexp about magic-number vs. corresponding content-types.
Each element looks like (REGEXP TYPE SUBTYPE).
REGEXP is a regular expression to match against the beginning of the
content of entity.
TYPE is symbol to indicate primary type of content-type.
SUBTYPE is symbol to indicate subtype of content-type.")
(defvar octet-type-filter-alist
`((msexcel octet-filter-call1 "xlhtml" ("-te") html-u8)
(msppt octet-filter-call1 "ppthtml" nil html-u8)
(msword octet-filter-call2-extra "wvHtml" nil html-u8)
(html octet-render-html nil nil nil)
(html-u8 octet-decode-u8-text nil nil html)
(html-un octet-decode-text nil nil html)
(gzip octet-filter-call1 "gunzip" ("-c") guess)
(bzip2 octet-filter-call1 "bunzip2" ("-c") guess)
(text octet-decode-text nil nil nil)
(ignore ignore nil nil nil)
(jpeg octet-decode-image nil jpeg nil)
(gif octet-decode-image nil gif nil)
(png octet-decode-image nil png nil)
(tiff octet-decode-image nil tiff nil)
(guess octet-filter-guess nil nil nil)
(lzh octet-filter-call1 "lha" ("-v") text)
(tar octet-tar-mode nil nil nil)
(pdf octet-filter-call2 "pdftotext" ("-q" "-eucjp" "-raw") text))
"Alist of type-to-filter-program.
Each element should have the form like:
\(TYPE FUNCTION FILTER_PROGRAM ARGUMENT NEW-TYPE\)
nil in NEW-TYPE means filtering is completed.")
(defvar octet-find-file-hook nil)
(defvar octet-attachments nil)
(make-variable-buffer-local 'octet-attachments)
(defun octet-render-html (&rest args)
(funcall octet-html-render-function (point-min) (point-max))
0)
(defun octet-decode-text (&rest args)
(let ((string (buffer-string)))
(erase-buffer)
(set-buffer-multibyte t)
(insert (decode-coding-string string 'undecided)))
0)
;;; HTML rendering by w3m.el
(defun w3m-about-octet-attachments (url &optional no-decode no-cache
&rest args)
(let (buffer attachments pair)
(set-buffer-multibyte nil)
(when (string-match "\\`about://octet-attachments/\\([^/]+\\)/" url)
(setq buffer (get-buffer (base64-decode-string (match-string 1 url)))
url (substring url (match-end 0))
attachments (with-current-buffer buffer
octet-attachments))
(when (and buffer attachments
(setq pair (assoc url attachments)))
(insert (cdr pair)))))
(car (funcall (symbol-function 'w3m-local-file-type) url)))
(defun octet-w3m-region (beg end)
(let ((w3m-display-inline-images t)
(w3m-url-hierarchical-schemes '("about")))
(funcall (symbol-function 'w3m-region)
beg end (concat "about://octet-attachments/"
(base64-encode-string
(buffer-name (current-buffer))) "/"))
(setq octet-attachments nil))
0)
;; Decode image
(static-cond
((featurep 'xemacs)
(defun octet-decode-image (ignore &rest args)
(let (glyph)
(if (memq (car args) (image-instantiator-format-list))
(progn
(setq glyph (make-glyph (vector (car args) :data (buffer-string))))
(if glyph
(progn (erase-buffer)
(set-extent-end-glyph
(make-extent (point-min)(point-min))
glyph)
0)
1))
1))))
((>= emacs-major-version 21)
(defun octet-decode-image (ignore &rest args)
(let (image)
(if (image-type-available-p (car args))
(progn
(setq image (create-image (buffer-string) (car args) 'data))
(if image
(progn (erase-buffer)
(insert-image image) 0)
1))
1))))
(t
(defalias 'octet-decode-image 'ignore)))
(defun octet-decode-u8-text (&rest args)
(let ((string (buffer-string)))
(erase-buffer)
(set-buffer-multibyte t)
(insert (decode-coding-string string 'utf-8)))
0)
(defun octet-filter-call2 (filter &optional args)
"Call octed filter with two arguments (infile, outfile).
Current buffer content is replaced.
Returns 0 if succeed."
(let ((infile (file-name-nondirectory
(make-temp-file (expand-file-name "octet"
octet-temp-directory))))
(outfile (file-name-nondirectory
(make-temp-file (expand-file-name "octet"
octet-temp-directory))))
(last-dir default-directory)
result)
(cd octet-temp-directory)
(write-region-as-binary (point-min) (point-max) infile nil 'no-msg)
(unwind-protect
(progn
(as-binary-process
(setq result (apply 'call-process filter nil nil nil
(append args (list infile outfile)))))
(when (and (numberp result)
(zerop result))
(erase-buffer)
(insert-file-contents-as-binary outfile))
0)
(if (file-exists-p infile) (delete-file infile))
(if (file-exists-p outfile) (delete-file outfile))
(cd last-dir))))
(defun octet-filter-call2-extra (filter &optional args)
"Call octed filter with two arguments (infile, outfile).
Current buffer content is replaced.
Also, exta attachments are collected to `octet-attachments'.
Returns 0 if succeed."
(let ((infile (file-name-nondirectory
(make-temp-file (expand-file-name "octet"
octet-temp-directory))))
(outfile (file-name-nondirectory
(make-temp-file (expand-file-name "octet"
octet-temp-directory))))
(last-dir default-directory)
result)
(cd octet-temp-directory)
(write-region-as-binary (point-min) (point-max) infile nil 'no-msg)
(unwind-protect
(progn
(as-binary-process
(setq result (apply 'call-process filter nil nil nil
(append args (list infile outfile)))))
(when (and (numberp result)
(zerop result))
(erase-buffer)
(insert-file-contents-as-binary outfile)
(dolist (attach (directory-files "." nil (concat
(regexp-quote outfile)
".*\\..*")))
(setq octet-attachments
(cons (cons
attach
(with-temp-buffer
(insert-file-contents-as-binary attach)
(buffer-string)))
octet-attachments))
(if (file-exists-p attach) (delete-file attach))
))
0)
(if (file-exists-p infile) (delete-file infile))
(if (file-exists-p outfile) (delete-file outfile))
(cd last-dir))))
(defun octet-filter-call1 (filter &optional args)
"Call external octed filter with two arguments (infile) and obtain stdout.
Current buffer content is replaced.
Returns 0 if succeed."
(let ((infile (file-name-nondirectory
(make-temp-file (expand-file-name "octet"
octet-temp-directory))))
(last-dir default-directory)
result)
(cd octet-temp-directory)
(write-region-as-binary (point-min) (point-max) infile nil 'no-msg)
(unwind-protect
(progn
(erase-buffer)
(as-binary-process
(setq result (apply 'call-process filter nil t nil
(append args (list infile)))))
(if (numberp result) result 1))
(if (file-exists-p infile) (delete-file infile))
(cd last-dir))))
(defun octet-filter-guess (&rest args)
(let (buffer-file-name)
(octet-buffer)
0))
(defun octet-tar-mode (&rest args)
(funcall (symbol-function 'tar-mode))
0)
(defun octet-guess-type-from-name (name)
(when (string-match "\\.\\([a-z0-9]+\\)\\'" name)
(cdr (assoc (downcase (match-string 1 name))
octet-suffix-type-alist))))
(defun octet-guess-type-from-content-type (content-type)
(let ((alist octet-content-type-alist)
type)
(while alist
(when (string-match (car (car alist)) content-type)
(setq type (cdr (car alist))
alist nil))
(setq alist (cdr alist)))
type))
(defun octet-guess-type-from-magic ()
(let ((rest octet-magic-type-alist)
type subtype)
(goto-char (point-min))
(while (not (let ((cell (car rest)))
(if cell
(if (looking-at (car cell))
(setq type (nth 1 cell)
subtype (nth 2 cell)))
t)))
(setq rest (cdr rest)))
(if type
(octet-guess-type-from-content-type
(concat (symbol-name type) "/" (symbol-name subtype))))))
(defun octet-filter-buffer (type)
"Call a filter function in `octet-type-filter-alist'.
TYPE is the symbol of type.
Returns NEW-TYPE."
(let ((elem (assq type octet-type-filter-alist)))
(if (zerop (apply (nth 1 elem) (list (nth 2 elem) (nth 3 elem))))
(nth 4 elem))))
;;;###autoload
(defun octet-buffer (&optional name content-type)
"View octet-stream content according to `octet-type-filter-alist'.
Optional NAME is the filename.
If optional CONTENT-TYPE is specified, it is used for type guess."
(interactive)
(let ((type (or (and content-type
(octet-guess-type-from-content-type
content-type))
(octet-guess-type-from-magic)
(and (or name buffer-file-name)
(octet-guess-type-from-name
(or name buffer-file-name)))
(intern (condition-case nil
(completing-read "Octet Type(text): "
(mapcar
(lambda (pair)
(list (symbol-name
(cdr pair))))
octet-suffix-type-alist)
nil 'require-match nil nil
"text")
(quit "text"))))))
(while (setq type (octet-filter-buffer type)))))
(static-if (featurep 'xemacs)
(defun octet-insert-buffer (from)
"Insert after point the contents of BUFFER and the image."
(let (extent glyph)
(with-current-buffer from
(if (setq extent (extent-at (point-min) nil nil nil 'at))
(setq glyph (extent-end-glyph extent))))
(insert-buffer from)
(if glyph
(set-extent-end-glyph (make-extent (point) (point))
glyph))))
(defalias 'octet-insert-buffer 'insert-buffer))
;;;###autoload
(defun octet-find-file (file)
"Find FILE with octet-stream decoding."
(interactive "fFilename: ")
(as-binary-input-file (find-file file))
(unwind-protect
(let (buffer-read-only)
(octet-buffer))
(goto-char (point-min))
(set-buffer-modified-p nil)
(auto-save-mode -1)
(setq buffer-read-only t
truncate-lines t)
(run-hooks 'octet-find-file-hook)))
;;;
;; Functions for SEMI.
;;
(defvar mime-preview-octet-hook nil)
(defvar mime-view-octet-hook nil)
;;;###autoload
(defun mime-preview-octet (entity situation)
"A method for mime-view to preview octet message."
(goto-char (point-max))
(let ((p (point))
(name (mime-entity-filename entity))
from-buf to-buf)
(insert "\n")
(goto-char p)
(save-restriction
(narrow-to-region p p)
(setq to-buf (current-buffer))
(with-temp-buffer
(setq from-buf (current-buffer))
(w3m-insert-string (mime-entity-content entity))
(octet-buffer name (mime-entity-type/subtype entity))
(with-current-buffer to-buf
(octet-insert-buffer from-buf)
(run-hooks 'mime-preview-octet-hook))))))
;;;###autoload
(defun mime-view-octet (entity situation)
"A method for mime-view to display octet message."
(let (type subtype)
(let ((mdata (mime-entity-content entity))
(rest octet-magic-type-alist))
(while (not (let ((cell (car rest)))
(if cell
(if (string-match (car cell) mdata)
(setq type (nth 1 cell)
subtype (nth 2 cell)))
t)))
(setq rest (cdr rest)))
(if type
(progn
(setq situation (del-alist 'method (copy-alist situation)))
(funcall (symbol-function 'mime-play-entity)
entity
(put-alist 'type type
(put-alist 'subtype subtype
situation))
'mime-view-octet))
(let ((buf (get-buffer-create
(format "%s-%s" (buffer-name) (mime-entity-number entity))))
(name (mime-entity-filename entity)))
(with-current-buffer buf
(set-buffer-multibyte nil)
(setq buffer-read-only nil)
(erase-buffer)
(w3m-insert-string mdata)
(octet-buffer name (mime-entity-type/subtype entity))
(setq buffer-read-only t
truncate-lines t)
(set-buffer-multibyte t)
(set-buffer-modified-p nil))
(let ((win (get-buffer-window (current-buffer))))
(or (eq (selected-window) win)
(select-window (or win (get-largest-window)))))
(view-buffer buf)
(run-hooks 'mime-view-octet-hook)
(goto-char (point-min)))))))
;;;###autoload
(defun octet-mime-setup ()
"Octet setting for MIME module."
(eval-after-load "mime-view"
'(progn
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . msword)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . excel)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . x-msexcel)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . vnd.ms-excel)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . vnd.ms-powerpoint)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-acting-condition
'((mode . "play")
(type . application)(subtype . octet-stream)
(method . mime-view-octet)))
(ctree-set-calist-strictly
'mime-preview-condition
'((type . application)(subtype . t)
(encoding . t)
(body . invisible)
(body-presentation-method . mime-preview-octet)))
;; another condition?
)))
(provide 'octet)
;;; octet.el ends here
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