1 ;;; mm-util.el --- Utility functions for MIME things
2 ;; Copyright (C) 1998 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
5 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
27 (defvar mm-default-coding-system nil
28 "The default coding system to use.")
30 (defvar mm-known-charsets '(iso-8859-1)
31 "List of known charsets.")
33 (defvar mm-mime-mule-charset-alist
35 (iso-8859-1 latin-iso8859-1)
36 (iso-8859-2 latin-iso8859-2)
37 (iso-8859-3 latin-iso8859-3)
38 (iso-8859-4 latin-iso8859-4)
39 (iso-8859-5 cyrillic-iso8859-5)
40 (koi8-r cyrillic-iso8859-5)
41 (iso-8859-6 arabic-iso8859-6)
42 (iso-8859-7 greek-iso8859-7)
43 (iso-8859-8 hebrew-iso8859-8)
44 (iso-8859-9 latin-iso8859-9)
45 (iso-2022-jp latin-jisx0201
46 japanese-jisx0208-1978 japanese-jisx0208)
47 (euc-kr korean-ksc5601)
48 (cn-gb-2312 chinese-gb2312)
49 (cn-big5 chinese-big5-1 chinese-big5-2)
50 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
51 latin-jisx0201 japanese-jisx0208-1978
52 chinese-gb2312 japanese-jisx0208
53 korean-ksc5601 japanese-jisx0212)
54 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
55 latin-jisx0201 japanese-jisx0208-1978
56 chinese-gb2312 japanese-jisx0208
57 korean-ksc5601 japanese-jisx0212
58 chinese-cns11643-1 chinese-cns11643-2)
59 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
60 cyrillic-iso8859-5 greek-iso8859-7
61 latin-jisx0201 japanese-jisx0208-1978
62 chinese-gb2312 japanese-jisx0208
63 korean-ksc5601 japanese-jisx0212
64 chinese-cns11643-1 chinese-cns11643-2
65 chinese-cns11643-3 chinese-cns11643-4
66 chinese-cns11643-5 chinese-cns11643-6
68 "Alist of MIME-charset/MULE-charsets.")
74 (let ((nfunc (intern (format "mm-%s" (car elem)))))
75 (if (fboundp (car elem))
76 (fset nfunc (car elem))
77 (fset nfunc (cdr elem)))))
78 '((decode-coding-string . (lambda (s a) s))
79 (encode-coding-string . (lambda (s a) s))
80 (encode-coding-region . ignore)
81 (coding-system-list . ignore)
82 (decode-coding-region . ignore)
84 (device-type . ignore)
85 (coding-system-equal . equal)
86 (annotationp . ignore)
87 (set-buffer-file-coding-system . ignore)
89 . (lambda (charset int)
93 "Prompt the user for a coding system."
95 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
96 mm-mime-mule-charset-alist)))))))
98 (defvar mm-coding-system-list nil)
99 (defun mm-get-coding-system-list ()
100 "Get the coding system list."
101 (or mm-coding-system-list
102 (setq mm-coding-system-list (mm-coding-system-list))))
104 (defvar mm-charset-coding-system-alist
106 '((gb2312 . cn-gb-2312)
107 (iso-2022-jp-2 . iso-2022-7bit-ss2)
109 (systems (mm-get-coding-system-list))
112 (let ((pair (car rest)))
113 (unless (memq (car pair) systems)
114 (setq dest (cons pair dest))))
115 (setq rest (cdr rest)))
117 "Charset/coding system alist.")
119 (defun mm-mule-charset-to-mime-charset (charset)
120 "Return the MIME charset corresponding to MULE CHARSET."
121 (let ((alist mm-mime-mule-charset-alist)
124 (when (memq charset (cdar alist))
125 (setq out (caar alist)
130 (defun mm-charset-to-coding-system (charset &optional lbt)
131 "Return coding-system corresponding to CHARSET.
132 CHARSET is a symbol naming a MIME charset.
133 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
134 used as the line break code type of the coding system."
135 (when (stringp charset)
136 (setq charset (intern (downcase charset))))
138 (or (cdr (assq charset mm-charset-coding-system-alist))
141 (setq charset (intern (format "%s-%s" charset lbt))))
143 ;; Running in a non-MULE environment.
144 ((and (null (mm-get-coding-system-list))
145 (memq charset mm-known-charsets))
148 ((eq charset 'us-ascii)
150 ;; Check to see whether we can handle this charset.
151 ((memq charset (mm-get-coding-system-list))
157 (defun mm-replace-chars-in-string (string from to)
158 "Replace characters in STRING from FROM to TO."
159 (let ((string (substring string 0)) ;Copy string.
160 (len (length string))
162 ;; Replace all occurrences of FROM with TO.
164 (when (= (aref string idx) from)
165 (aset string idx to))
169 (defsubst mm-enable-multibyte ()
170 "Enable multibyte in the current buffer."
171 (when (and (fboundp 'set-buffer-multibyte)
172 (default-value enable-multibyte-characters))
173 (set-buffer-multibyte t)))
175 (defsubst mm-disable-multibyte ()
176 "Disable multibyte in the current buffer."
177 (when (fboundp 'set-buffer-multibyte)
178 (set-buffer-multibyte nil)))
180 (defun mm-mime-charset (charset b e)
181 (if (fboundp 'coding-system-get)
184 mm-default-coding-system
185 (let ((safe (coding-system-get mm-default-coding-system
187 (or (eq safe t) (memq charset safe)))
188 (coding-system-get mm-default-coding-system 'mime-charset))
190 (get-charset-property charset 'prefered-coding-system)
192 (car (memq charset (find-coding-systems-region
193 (point-min) (point-max)))))
194 (mm-mule-charset-to-mime-charset charset)))
196 (defsubst mm-multibyte-p ()
197 "Say whether multibyte is enabled."
198 (and (boundp 'enable-multibyte-characters)
199 enable-multibyte-characters))
201 (defmacro mm-with-unibyte-buffer (&rest forms)
202 "Create a temporary buffer, and evaluate FORMS there like `progn'.
203 See also `with-temp-file' and `with-output-to-string'."
204 (let ((temp-buffer (make-symbol "temp-buffer"))
205 (multibyte (make-symbol "multibyte")))
206 `(if (not (boundp 'enable-multibyte-characters))
207 (with-temp-buffer ,@forms)
208 (let ((,multibyte (default-value enable-multibyte-characters))
212 (setq-default enable-multibyte-characters nil)
214 (get-buffer-create (generate-new-buffer-name " *temp*")))
216 (with-current-buffer ,temp-buffer
217 (let (buffer-file-coding-system)
219 (and (buffer-name ,temp-buffer)
220 (kill-buffer ,temp-buffer))))
221 (setq-default enable-multibyte-characters ,multibyte))))))
222 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
223 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
227 ;;; mm-util.el ends here