+(make-obsolete-variable 'mime-message-structure "should not use it.")
+
+
+;;; @ for mel-backend
+;;;
+
+(defvar mel-service-list nil)
+
+(defmacro mel-define-service (name &optional args &rest rest)
+ "Define NAME as a service for Content-Transfer-Encodings.
+If ARGS is specified, NAME is defined as a generic function for the
+service."
+ (` (progn
+ (add-to-list 'mel-service-list '(, name))
+ (defvar (, (intern (format "%s-obarray" name))) (make-vector 7 0))
+ (,@ (if args
+ (` ((defun (, name) (, args)
+ (,@ rest)
+ (funcall (mel-find-function '(, name)
+ (, (car (last args))))
+ (,@ (luna-arglist-to-arguments (butlast args))))
+ )))))
+ )))
+
+(put 'mel-define-service 'lisp-indent-function 'defun)
+
+
+(defvar mel-encoding-module-alist nil)
+
+(defsubst mel-find-function-from-obarray (ob-array encoding)
+ (let* ((f (intern-soft encoding ob-array)))
+ (or f
+ (let ((rest (cdr (assoc encoding mel-encoding-module-alist))))
+ (while (and rest
+ (progn
+ (require (car rest))
+ (null (setq f (intern-soft encoding ob-array)))
+ ))
+ (setq rest (cdr rest))
+ )
+ f))))
+
+(defsubst mel-copy-method (service src-backend dst-backend)
+ (let* ((oa (symbol-value (intern (format "%s-obarray" service))))
+ (f (mel-find-function-from-obarray oa src-backend))
+ sym)
+ (when f
+ (setq sym (intern dst-backend oa))
+ (or (fboundp sym)
+ (fset sym (symbol-function f))
+ ))))
+
+(defsubst mel-copy-backend (src-backend dst-backend)
+ (let ((services mel-service-list))
+ (while services
+ (mel-copy-method (car services) src-backend dst-backend)
+ (setq services (cdr services)))))
+
+(defmacro mel-define-backend (type &optional parents)
+ "Define TYPE as a mel-backend.
+If PARENTS is specified, TYPE inherits PARENTS.
+Each parent must be backend name (string)."
+ (cons 'progn
+ (mapcar (function
+ (lambda (parent)
+ (` (mel-copy-backend (, parent) (, type)))
+ ))
+ parents)))
+
+(defmacro mel-define-method (name args &rest body)
+ "Define NAME as a method function of (nth 1 (car (last ARGS))) backend.
+ARGS is like an argument list of lambda, but (car (last ARGS)) must be
+specialized parameter. (car (car (last ARGS))) is name of variable
+and (nth 1 (car (last ARGS))) is name of backend (encoding)."
+ (let* ((specializer (car (last args)))
+ (class (nth 1 specializer)))
+ (` (progn
+ (mel-define-service (, name))
+ (fset (intern (, class) (, (intern (format "%s-obarray" name))))
+ (function
+ (lambda (, (butlast args))
+ (,@ body))))))))
+
+(put 'mel-define-method 'lisp-indent-function 'defun)
+
+(defmacro mel-define-method-function (spec function)
+ "Set SPEC's function definition to FUNCTION.
+First element of SPEC is service.
+Rest of ARGS is like an argument list of lambda, but (car (last ARGS))
+must be specialized parameter. (car (car (last ARGS))) is name of
+variable and (nth 1 (car (last ARGS))) is name of backend (encoding)."
+ (let* ((name (car spec))
+ (args (cdr spec))
+ (specializer (car (last args)))
+ (class (nth 1 specializer)))
+ (` (let (sym)
+ (mel-define-service (, name))
+ (setq sym (intern (, class) (, (intern (format "%s-obarray" name)))))
+ (or (fboundp sym)
+ (fset sym (symbol-function (, function))))))))
+
+(defmacro mel-define-function (function spec)
+ (let* ((name (car spec))
+ (args (cdr spec))
+ (specializer (car (last args)))
+ (class (nth 1 specializer)))
+ (` (progn
+ (define-function (, function)
+ (intern (, class) (, (intern (format "%s-obarray" name)))))
+ ))))
+
+(defvar base64-dl-module
+ (if (and (fboundp 'base64-encode-string)
+ (subrp (symbol-function 'base64-encode-string)))
+ nil
+ (if (fboundp 'dynamic-link)
+ (let ((path (expand-file-name "base64.so" exec-directory)))
+ (and (file-exists-p path)
+ path)
+ ))))
+