+(condition-case nil
+ (require 'cyrillic)
+ (error nil))
+
+(defvar mime-charset-coding-system-alist
+ '((iso-8859-1 . *ctext*)
+ (x-ctext . *ctext*)
+ (gb2312 . *euc-china*)
+ (koi8-r . *koi8*)
+ (iso-2022-jp-2 . *iso-2022-ss2-7*)
+ (x-iso-2022-jp-2 . *iso-2022-ss2-7*)
+ (shift_jis . *sjis*)
+ (x-shiftjis . *sjis*)))
+
+(defsubst mime-charset-to-coding-system (charset &optional lbt)
+ "Return coding-system corresponding with CHARSET.
+CHARSET is a symbol whose name is MIME charset.
+If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
+is specified, it is used as line break code type of coding-system."
+ (if (stringp charset)
+ (setq charset (intern (downcase charset))))
+ (setq charset (or (cdr (assq charset mime-charset-coding-system-alist))
+ (intern (concat "*" (symbol-name charset) "*"))))
+ (if lbt
+ (setq charset (intern (format "%s%s" charset
+ (cond ((eq lbt 'CRLF) 'dos)
+ ((eq lbt 'LF) 'unix)
+ ((eq lbt 'CR) 'mac)
+ (t lbt))))))
+ (if (coding-system-p charset)
+ charset))
+