;;; mcs-e20.el --- MIME charset implementation for Emacs 20.1 and 20.2

;; Copyright (C) 1996,1997,1998 Free Software Foundation, Inc.

;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;    This module requires Emacs 20.1 and 20.2.

;;; Code:

(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
  '(((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)
;;; ((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)
    ((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)
    ((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 coding-system-to-mime-charset (coding-system)
  "Convert CODING-SYSTEM to a MIME-charset.
Return nil if corresponding MIME-charset is not found."
  (or (car (rassq coding-system mime-charset-coding-system-alist))
      (coding-system-get coding-system 'mime-charset)))

(defun mime-charset-list ()
  "Return a list of all existing MIME-charset."
  (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)
	(if (setq cs (coding-system-get cs 'mime-charset))
	    (or (rassq cs mime-charset-coding-system-alist)
		(memq cs dest)  
		(setq dest (cons cs dest))
		)))
      (setq rest (cdr rest)))
    dest))


;;; @ end
;;;

(require 'mcs-20)

(provide 'mcs-e20)

;;; mcs-e20.el ends here