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;;; mcs-e20.el --- MIME charset implementation for Emacs 20.1 and 20.2
;; Copyright (C) 1996,1997,1998,1999,2000 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <tomo@m17n.org>
;; Keywords: emulation, compatibility, Mule
;; This file is part of APEL (A Portable Emacs Library).
;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This module requires Emacs 20.1 and 20.2.
;;; Code:
(require 'pces)
(eval-when-compile (require 'static))
(defsubst encode-mime-charset-region (start end charset &optional lbt)
"Encode the text between START and END as MIME CHARSET."
(let (cs)
(if (and enable-multibyte-characters
(setq cs (mime-charset-to-coding-system charset lbt)))
(encode-coding-region start end cs)
)))
(defsubst decode-mime-charset-region (start end charset &optional lbt)
"Decode the text between START and END as MIME CHARSET."
(let (cs)
(if (and enable-multibyte-characters
(setq cs (mime-charset-to-coding-system charset lbt)))
(decode-coding-region start end cs)
)))
(defsubst encode-mime-charset-string (string charset &optional lbt)
"Encode the STRING as MIME CHARSET."
(let (cs)
(if (and enable-multibyte-characters
(setq cs (mime-charset-to-coding-system charset lbt)))
(encode-coding-string string cs)
string)))
(defsubst decode-mime-charset-string (string charset &optional lbt)
"Decode the STRING as MIME CHARSET."
(let (cs)
(if (and enable-multibyte-characters
(setq cs (mime-charset-to-coding-system charset lbt)))
(decode-coding-string string cs)
string)))
(defvar charsets-mime-charset-alist
(delq
nil
`(((ascii) . us-ascii)
((ascii latin-iso8859-1) . iso-8859-1)
((ascii latin-iso8859-2) . iso-8859-2)
((ascii latin-iso8859-3) . iso-8859-3)
((ascii latin-iso8859-4) . iso-8859-4)
,(if (find-coding-system 'iso-8859-15)
'((ascii latin-iso8859-15) . iso-8859-15))
;;((ascii cyrillic-iso8859-5) . iso-8859-5)
((ascii cyrillic-iso8859-5) . koi8-r)
((ascii arabic-iso8859-6) . iso-8859-6)
((ascii greek-iso8859-7) . iso-8859-7)
((ascii hebrew-iso8859-8) . iso-8859-8)
((ascii latin-iso8859-9) . iso-8859-9)
,(if (find-coding-system 'iso-8859-14)
'((ascii latin-iso8859-14) . iso-8859-14))
((ascii latin-jisx0201
japanese-jisx0208-1978 japanese-jisx0208) . iso-2022-jp)
((ascii latin-jisx0201
katakana-jisx0201 japanese-jisx0208) . shift_jis)
((ascii korean-ksc5601) . euc-kr)
((ascii chinese-gb2312) . gb2312)
((ascii chinese-big5-1 chinese-big5-2) . big5)
,(static-cond
((null (string< mule-version "6.0"))
'((ascii thai-tis620) . tis-620))
(t
'((ascii thai-tis620 composition) . tis-620)))
;; ((ascii latin-iso8859-1 greek-iso8859-7
;; latin-jisx0201 japanese-jisx0208-1978
;; chinese-gb2312 japanese-jisx0208
;; korean-ksc5601 japanese-jisx0212) . iso-2022-jp-2)
;;((ascii latin-iso8859-1 greek-iso8859-7
;; latin-jisx0201 japanese-jisx0208-1978
;; chinese-gb2312 japanese-jisx0208
;; korean-ksc5601 japanese-jisx0212
;; chinese-cns11643-1 chinese-cns11643-2) . iso-2022-int-1)
;;((ascii latin-iso8859-1 latin-iso8859-2
;; cyrillic-iso8859-5 greek-iso8859-7
;; latin-jisx0201 japanese-jisx0208-1978
;; chinese-gb2312 japanese-jisx0208
;; korean-ksc5601 japanese-jisx0212
;; chinese-cns11643-1 chinese-cns11643-2
;; chinese-cns11643-3 chinese-cns11643-4
;; chinese-cns11643-5 chinese-cns11643-6
;; chinese-cns11643-7) . iso-2022-int-1)
)))
(defun-maybe coding-system-get (coding-system prop)
"Extract a value from CODING-SYSTEM's property list for property PROP."
(plist-get (coding-system-plist coding-system) prop)
)
(defvar coding-system-to-mime-charset-exclude-regexp
"^unknown$\\|^x-")
(defun coding-system-to-mime-charset (coding-system)
"Convert CODING-SYSTEM to a MIME-charset.
Return nil if corresponding MIME-charset is not found."
(or (coding-system-get coding-system 'mime-charset)
(let ((coding (coding-system-base coding-system))
(alist mime-charset-coding-system-alist)
result)
(while alist
(if (eq (coding-system-base (cdar alist)) coding)
(setq result (caar alist)
alist nil)
(setq alist (cdr alist))))
(unless (and coding-system-to-mime-charset-exclude-regexp
(string-match coding-system-to-mime-charset-exclude-regexp
(symbol-name result)))
result))))
(defun-maybe-cond mime-charset-list ()
"Return a list of all existing MIME-charset."
((boundp 'coding-system-list)
(let ((dest (mapcar (function car) mime-charset-coding-system-alist))
(rest coding-system-list)
cs)
(while rest
(setq cs (car rest))
(when (and (setq cs (coding-system-get cs 'mime-charset))
(null (memq cs dest)))
(setq dest (cons cs dest)))
(setq rest (cdr rest)))
dest))
(t
(let ((dest (mapcar (function car) mime-charset-coding-system-alist))
(rest (coding-system-list))
cs)
(while rest
(setq cs (car rest))
(unless (rassq cs mime-charset-coding-system-alist)
(when (setq cs (or (coding-system-get cs 'mime-charset)
(and
(setq cs (aref
(coding-system-get cs 'coding-spec)
2))
(string-match "(MIME:[ \t]*\\([^,)]+\\)" cs)
(match-string 1 cs))))
(setq cs (intern (downcase cs)))
(unless (memq cs dest)
(setq dest (cons cs dest))
)))
(setq rest (cdr rest)))
dest)
))
(static-when (and (string= (decode-coding-string "\e.A\eN!" 'ctext) "\eN!")
(or (not (find-coding-system 'x-ctext))
(coding-system-get 'x-ctext 'apel)))
(unless (find-coding-system 'x-ctext)
(make-coding-system
'x-ctext 2 ?x
"Compound text based generic encoding for decoding unknown messages."
'((ascii t) (latin-iso8859-1 t) t t
nil ascii-eol ascii-cntl nil locking-shift single-shift nil nil nil
init-bol nil nil)
'((safe-charsets . t)
(mime-charset . x-ctext)))
(coding-system-put 'x-ctext 'apel t)
))
;;; @ end
;;;
(require 'product)
(product-provide (provide 'mcs-e20) (require 'apel-ver))
;;; mcs-e20.el ends here
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