--- /dev/null
+;;; mime-parse.el --- MIME message parser
+
+;; Copyright (C) 1994,1995,1996,1997,1998 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Keywords: parse, MIME, multimedia, mail, news
+
+;; This file is part of SEMI (Spadework for Emacs MIME Interfaces).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, or (at
+;; your option) any later version.
+
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(require 'emu)
+(require 'std11)
+(require 'mime-def)
+
+
+;;; @ field parser
+;;;
+
+(defconst mime/content-parameter-value-regexp
+ (concat "\\("
+ std11-quoted-string-regexp
+ "\\|[^; \t\n]*\\)"))
+
+(defconst mime::parameter-regexp
+ (concat "^[ \t]*\;[ \t]*\\(" mime-token-regexp "\\)"
+ "[ \t]*=[ \t]*\\(" mime/content-parameter-value-regexp "\\)"))
+
+(defun mime-parse-parameter (str)
+ (if (string-match mime::parameter-regexp str)
+ (let ((e (match-end 2)))
+ (cons
+ (cons (downcase (substring str (match-beginning 1) (match-end 1)))
+ (std11-strip-quoted-string
+ (substring str (match-beginning 2) e))
+ )
+ (substring str e)
+ ))))
+
+
+;;; @ Content-Type
+;;;
+
+(defsubst make-mime-content-type (type subtype &optional parameters)
+ (list* (cons 'type type)
+ (cons 'subtype subtype)
+ (nreverse parameters))
+ )
+
+(defun mime-parse-Content-Type (string)
+ "Parse STRING as field-body of Content-Type field.
+Return value is
+ (PRIMARY-TYPE SUBTYPE (NAME1 . VALUE1)(NAME2 . VALUE2) ...)
+or nil. PRIMARY-TYPE and SUBTYPE are symbol and NAME_n and VALUE_n
+are string."
+ (setq string (std11-unfold-string string))
+ (if (string-match `,(concat "^\\(" mime-token-regexp
+ "\\)/\\(" mime-token-regexp "\\)") string)
+ (let* ((type (downcase
+ (substring string (match-beginning 1) (match-end 1))))
+ (subtype (downcase
+ (substring string (match-beginning 2) (match-end 2))))
+ ret dest)
+ (setq string (substring string (match-end 0)))
+ (while (setq ret (mime-parse-parameter string))
+ (setq dest (cons (car ret) dest)
+ string (cdr ret))
+ )
+ (make-mime-content-type (intern type)(intern subtype)
+ (nreverse dest))
+ )))
+
+(defun mime-read-Content-Type ()
+ "Read field-body of Content-Type field from current-buffer,
+and return parsed it. Format of return value is as same as
+`mime-parse-Content-Type'."
+ (let ((str (std11-field-body "Content-Type")))
+ (if str
+ (mime-parse-Content-Type str)
+ )))
+
+(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 primary-type of CONTENT-TYPE."
+ (cdr (cadr content-type)))
+
+(defsubst mime-content-type-parameters (content-type)
+ "Return primary-type of CONTENT-TYPE."
+ (cddr content-type))
+
+(defsubst mime-content-type-parameter (content-type parameter)
+ "Return PARAMETER value of CONTENT-TYPE."
+ (cdr (assoc parameter (mime-content-type-parameters content-type))))
+
+
+;;; @ Content-Disposition
+;;;
+
+(defconst mime-disposition-type-regexp mime-token-regexp)
+
+(defun mime-parse-Content-Disposition (string)
+ "Parse STRING as field-body of Content-Disposition field."
+ (setq string (std11-unfold-string string))
+ (if (string-match `,(concat "^" mime-disposition-type-regexp) string)
+ (let* ((e (match-end 0))
+ (type (downcase (substring string 0 e)))
+ ret dest)
+ (setq string (substring string e))
+ (while (setq ret (mime-parse-parameter string))
+ (setq dest (cons (car ret) dest)
+ string (cdr ret))
+ )
+ (cons (cons 'type (intern type))
+ (nreverse dest))
+ )))
+
+(defun mime-read-Content-Disposition ()
+ "Read field-body of Content-Disposition field from current-buffer,
+and return parsed it."
+ (let ((str (std11-field-body "Content-Disposition")))
+ (if str
+ (mime-parse-Content-Disposition str)
+ )))
+
+(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"))
+
+
+;;; @ Content-Transfer-Encoding
+;;;
+
+(defun mime-parse-Content-Transfer-Encoding (string)
+ "Parse STRING as field-body of Content-Transfer-Encoding field."
+ (if (string-match "[ \t\n\r]+$" string)
+ (setq string (match-string 0 string))
+ )
+ (downcase string))
+
+(defun mime-read-Content-Transfer-Encoding (&optional default-encoding)
+ "Read field-body of Content-Transfer-Encoding field from
+current-buffer, and return it.
+If is is not found, return DEFAULT-ENCODING."
+ (let ((str (std11-field-body "Content-Transfer-Encoding")))
+ (if str
+ (mime-parse-Content-Transfer-Encoding str)
+ default-encoding)))
+
+
+;;; @ message parser
+;;;
+
+(defalias 'mime-entity-point-min 'mime-entity-header-start)
+(defalias 'mime-entity-point-max 'mime-entity-body-end)
+
+(defsubst mime-entity-media-type (entity)
+ (mime-content-type-primary-type (mime-entity-content-type entity)))
+(defsubst mime-entity-media-subtype (entity)
+ (mime-content-type-subtype (mime-entity-content-type entity)))
+(defsubst mime-entity-parameters (entity)
+ (mime-content-type-parameters (mime-entity-content-type entity)))
+
+(defsubst mime-entity-type/subtype (entity-info)
+ (mime-type/subtype-string (mime-entity-media-type entity-info)
+ (mime-entity-media-subtype entity-info)))
+
+(defun mime-parse-multipart (header-start header-end body-start body-end
+ content-type content-disposition
+ encoding node-id)
+ (goto-char (point-min))
+ (let* ((dash-boundary
+ (concat "--"
+ (std11-strip-quoted-string
+ (mime-content-type-parameter content-type "boundary"))))
+ (delimiter (concat "\n" (regexp-quote dash-boundary)))
+ (close-delimiter (concat delimiter "--[ \t]*$"))
+ (rsep (concat delimiter "[ \t]*\n"))
+ (dc-ctl
+ (if (eq (mime-content-type-subtype content-type) 'digest)
+ (make-mime-content-type 'message 'rfc822)
+ (make-mime-content-type 'text 'plain)
+ ))
+ cb ce ret ncb children (i 0))
+ (save-restriction
+ (goto-char body-end)
+ (narrow-to-region header-end
+ (if (re-search-backward close-delimiter nil t)
+ (match-beginning 0)
+ body-end))
+ (goto-char header-start)
+ (re-search-forward rsep nil t)
+ (setq cb (match-end 0))
+ (while (re-search-forward rsep nil t)
+ (setq ce (match-beginning 0))
+ (setq ncb (match-end 0))
+ (save-restriction
+ (narrow-to-region cb ce)
+ (setq ret (mime-parse-message dc-ctl "7bit" (cons i node-id)))
+ )
+ (setq children (cons ret children))
+ (goto-char (mime-entity-point-max ret))
+ (goto-char (setq cb ncb))
+ (setq i (1+ i))
+ )
+ (setq ce (point-max))
+ (save-restriction
+ (narrow-to-region cb ce)
+ (setq ret (mime-parse-message dc-ctl "7bit" (cons i node-id)))
+ )
+ (setq children (cons ret children))
+ )
+ (make-mime-entity (current-buffer)
+ header-start header-end body-start body-end
+ node-id content-type content-disposition encoding
+ (nreverse children))
+ ))
+
+(defun mime-parse-message (&optional default-ctl default-encoding node-id)
+ "Parse current-buffer as a MIME message.
+DEFAULT-CTL is used when an entity does not have valid Content-Type
+field. Its format must be as same as return value of
+mime-{parse|read}-Content-Type."
+ (let ((header-start (point-min))
+ header-end
+ body-start
+ (body-end (point-max))
+ content-type content-disposition encoding
+ primary-type)
+ (goto-char header-start)
+ (if (re-search-forward "^$" nil t)
+ (setq header-end (match-end 0)
+ body-start (1+ header-end))
+ (setq header-end (point-min)
+ body-start (point-min))
+ )
+ (save-restriction
+ (narrow-to-region header-start header-end)
+ (setq content-type (or (let ((str (std11-fetch-field "Content-Type")))
+ (if str
+ (mime-parse-Content-Type str)
+ ))
+ default-ctl)
+ content-disposition (let ((str (std11-fetch-field
+ "Content-Disposition")))
+ (if str
+ (mime-parse-Content-Disposition str)
+ ))
+ encoding (let ((str (std11-fetch-field
+ "Content-Transfer-Encoding")))
+ (if str
+ (mime-parse-Content-Transfer-Encoding str)
+ default-encoding))
+ primary-type (mime-content-type-primary-type content-type))
+ )
+ (cond ((eq primary-type 'multipart)
+ (mime-parse-multipart header-start header-end
+ body-start body-end
+ content-type content-disposition encoding
+ node-id)
+ )
+ ((and (eq primary-type 'message)
+ (memq (mime-content-type-subtype content-type)
+ '(rfc822 news)
+ ))
+ (make-mime-entity (current-buffer)
+ header-start header-end body-start body-end
+ node-id
+ content-type content-disposition encoding
+ (save-restriction
+ (narrow-to-region body-start body-end)
+ (list (mime-parse-message
+ nil nil (cons 0 node-id)))
+ ))
+ )
+ (t
+ (make-mime-entity (current-buffer)
+ header-start header-end body-start body-end
+ node-id
+ content-type content-disposition encoding nil)
+ ))
+ ))
+
+
+;;; @ utilities
+;;;
+
+(defsubst mime-root-entity-p (entity)
+ "Return t if ENTITY is root-entity (message)."
+ (null (mime-entity-node-id entity)))
+
+
+;;; @ end
+;;;
+
+(provide 'mime-parse)
+
+;;; mime-parse.el ends here
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