+(defconst Q-encoded-text-regexp
+ (concat "\\([^=?]\\|" quoted-printable-octet-regexp "\\)+"))
+
+;; (defconst eword-Q-encoding-and-encoded-text-regexp
+;; (concat "\\(Q\\)\\?" eword-Q-encoded-text-regexp))
+
+
+;;; @ Content-Type
+;;;
+
+(defsubst make-mime-content-type (type subtype &optional parameters)
+ (cons (cons 'type type)
+ (cons (cons 'subtype subtype)
+ parameters)))
+
+(defsubst mime-content-type-primary-type (content-type)
+ "Return primary-type of CONTENT-TYPE."
+ (cdr (car content-type)))
+
+(defsubst mime-content-type-subtype (content-type)
+ "Return subtype of CONTENT-TYPE."
+ (cdr (car (cdr content-type))))
+
+(defsubst mime-content-type-parameters (content-type)
+ "Return parameters of CONTENT-TYPE."
+ (cdr (cdr content-type)))
+
+(defsubst mime-content-type-parameter (content-type parameter)
+ "Return PARAMETER value of CONTENT-TYPE."
+ (cdr (assoc parameter (cdr (cdr content-type)))))
+
+
+(defsubst mime-type/subtype-string (type &optional subtype)
+ "Return type/subtype string from TYPE and SUBTYPE."
+ (if type
+ (if subtype
+ (format "%s/%s" type subtype)
+ (format "%s" type))))
+
+
+;;; @ Content-Disposition
+;;;
+
+(defsubst make-mime-content-disposition (type &optional parameters)
+ (cons (cons 'type type)
+ parameters))
+
+(defsubst mime-content-disposition-type (content-disposition)
+ "Return disposition-type of CONTENT-DISPOSITION."
+ (cdr (car content-disposition)))
+
+(defsubst mime-content-disposition-parameters (content-disposition)
+ "Return disposition-parameters of CONTENT-DISPOSITION."
+ (cdr content-disposition))
+
+(defsubst mime-content-disposition-parameter (content-disposition parameter)
+ "Return PARAMETER value of CONTENT-DISPOSITION."
+ (cdr (assoc parameter (cdr content-disposition))))
+
+(defsubst mime-content-disposition-filename (content-disposition)
+ "Return filename of CONTENT-DISPOSITION."
+ (mime-content-disposition-parameter content-disposition "filename"))
+
+
+;;; @ message structure
+;;;
+
+(defvar mime-message-structure nil
+ "Information about structure of message.
+Please use reference function `mime-entity-SLOT' to get value of SLOT.
+
+Following is a list of slots of the structure:
+
+node-id node-id (list of integers)
+content-type content-type (content-type)
+content-disposition content-disposition (content-disposition)
+encoding Content-Transfer-Encoding (string or nil)
+children entities included in this entity (list of entity)
+
+If an entity includes other entities in its body, such as multipart or
+message/rfc822, `mime-entity' structures of them are included in
+`children', so the `mime-entity' structure become a tree.")
+
+(make-variable-buffer-local 'mime-message-structure)
+
+(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 (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
+ (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)
+ ))))
+