+(defcustom mime-uuencode-encoding-name-list '("x-uue" "x-uuencode")
+ "*List of encoding names for uuencode format."
+ :group 'mime
+ :type '(repeat string))
+
+
+;;; @@ for encoded-word
+;;;
+
+(defgroup mime-header nil
+ "Header representation, specially encoded-word"
+ :group 'mime)
+
+;;; @@@ decoding
+;;;
+
+(defcustom mime-field-decoding-max-size 1000
+ "*Max size to decode header field."
+ :group 'mime-header
+ :type '(choice (integer :tag "Limit (bytes)")
+ (const :tag "Don't limit" nil)))
+
+(defcustom mime-header-accept-quoted-encoded-words nil
+ "*Accept encoded-words in quoted-strings."
+ :group 'mime-header
+ :type 'boolean)
+
+
+;;; @@@ encoding
+;;;
+
+(defcustom mime-field-encoding-method-alist
+ '(("X-Nsubject" . iso-2022-jp-2)
+ ("Newsgroups" . nil)
+ ("Message-ID" . nil)
+ (t . mime)
+ )
+ "*Alist to specify field encoding method.
+Its key is field-name, value is encoding method.
+
+If method is `mime', this field will be encoded into MIME format.
+
+If method is a MIME-charset, this field will be encoded as the charset
+when it must be convert into network-code.
+
+If method is `default-mime-charset', this field will be encoded as
+variable `default-mime-charset' when it must be convert into
+network-code.
+
+If method is nil, this field will not be encoded."
+ :group 'mime-header
+ :type '(repeat (cons (choice :tag "Field"
+ (string :tag "Name")
+ (const :tag "Default" t))
+ (choice :tag "Method"
+ (const :tag "MIME conversion" mime)
+ (symbol :tag "non-MIME conversion")
+ (const :tag "no-conversion" nil)))))
+
+
+;;; @ required functions
+;;;
+
+(defsubst regexp-* (regexp)
+ (concat regexp "*"))
+
+(defsubst regexp-or (&rest args)
+ (concat "\\(" (mapconcat (function identity) args "\\|") "\\)"))
+
+(or (fboundp 'char-int)
+ (defalias 'char-int 'identity))
+
+
+;;; @ MIME constants
+;;;
+
+(defconst mime-tspecial-char-list
+ '(?\] ?\[ ?\( ?\) ?< ?> ?@ ?, ?\; ?: ?\\ ?\" ?/ ?? ?=))
+(defconst mime-token-regexp
+ (concat "[^" mime-tspecial-char-list "\000-\040]+"))
+(defconst mime-attribute-char-regexp
+ (concat "[^" mime-tspecial-char-list "\000-\040"
+ "*'%" ; introduced in RFC 2231.
+ "]"))
+
+(defconst mime-charset-regexp
+ (concat "[^" mime-tspecial-char-list "\000-\040"
+ "*'%" ; should not include "%"?
+ "]+"))
+
+;; More precisely, length of "[A-Za-z]+" is limited to at most 8.
+;; (defconst mime-language-regexp "[A-Za-z]+\\(-[A-Za-z]+\\)*")
+(defconst mime-language-regexp "[-A-Za-z]+")
+
+(defconst mime-encoding-regexp mime-token-regexp)
+
+
+;;; @@ base64 / B
+;;;
+
+(defconst base64-token-regexp "[A-Za-z0-9+/]")
+(defconst base64-token-padding-regexp "[A-Za-z0-9+/=]")
+
+(defconst B-encoded-text-regexp
+ (concat "\\(\\("
+ base64-token-regexp
+ base64-token-regexp
+ base64-token-regexp
+ base64-token-regexp
+ "\\)*"
+ base64-token-regexp
+ base64-token-regexp
+ base64-token-padding-regexp
+ base64-token-padding-regexp
+ "\\)"))
+
+;; (defconst eword-B-encoding-and-encoded-text-regexp
+;; (concat "\\(B\\)\\?" eword-B-encoded-text-regexp))
+
+
+;;; @@ Quoted-Printable / Q
+;;;
+
+(defconst quoted-printable-hex-chars "0123456789ABCDEF")
+
+(defconst quoted-printable-octet-regexp
+ (concat "=[" quoted-printable-hex-chars
+ "][" quoted-printable-hex-chars "]"))
+
+(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