+;;; @ for mm-backend
+;;;
+
+(require 'alist)
+
+(defvar mime-entity-implementation-alist nil)
+
+(defmacro mm-define-backend (type &optional parents)
+ "Define TYPE as a mm-backend.
+If PARENTS is specified, TYPE inherits PARENTS.
+Each parent must be backend name (symbol)."
+ (if parents
+ `(let ((rest ',(reverse parents)))
+ (while rest
+ (set-alist 'mime-entity-implementation-alist
+ ',type
+ (copy-alist
+ (cdr (assq (car rest)
+ mime-entity-implementation-alist))))
+ (setq rest (cdr rest))
+ ))))
+
+(defmacro mm-define-method (name args &rest body)
+ "Define NAME as a method function of (nth 1 (car ARGS)) backend.
+
+ARGS is like an argument list of lambda, but (car ARGS) must be
+specialized parameter. (car (car ARGS)) is name of variable and (nth
+1 (car ARGS)) is name of backend."
+ (let* ((specializer (car args))
+ (class (nth 1 specializer))
+ (self (car specializer)))
+ `(let ((imps (cdr (assq ',class mime-entity-implementation-alist)))
+ (func (lambda ,(if self
+ (cons self (cdr args))
+ (cdr args))
+ ,@body)))
+ (if imps
+ (set-alist 'mime-entity-implementation-alist
+ ',class (put-alist ',name func imps))
+ (set-alist 'mime-entity-implementation-alist
+ ',class
+ (list (cons ',name func)))
+ ))))
+
+(put 'mm-define-method 'lisp-indent-function 'defun)
+(put 'mm-define-method 'edebug-form-spec
+ '(&define name ((arg symbolp) &rest arg) def-body))
+
+(defsubst mm-arglist-to-arguments (arglist)
+ (let (dest)
+ (while arglist
+ (let ((arg (car arglist)))
+ (or (memq arg '(&optional &rest))
+ (setq dest (cons arg dest)))
+ )
+ (setq arglist (cdr arglist)))
+ (nreverse dest)))
+
+
+;;; @ 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 1 nil))
+ ,@(if args
+ `((defun ,name ,args
+ ,@rest
+ (funcall (mel-find-function ',name ,(car (last args)))
+ ,@(mm-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 (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)))
+ (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
+ (and (fboundp 'dynamic-link)
+ (let ((path (expand-file-name "base64.so" exec-directory)))
+ (and (file-exists-p path)
+ path))))
+
+