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;;; rfc2231.el --- functions for decoding rfc2231 headers
;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(require 'ietf-drums)
(defun rfc2231-get-value (ct attribute)
"Return the value of ATTRIBUTE from CT."
(cdr (assq attribute (cdr ct))))
(defun rfc2231-parse-string (string)
"Parse STRING and return a list.
The list will be on the form
`(name (attribute . value) (attribute . value)...)"
(with-temp-buffer
(let ((ttoken (ietf-drums-token-to-list ietf-drums-text-token))
(stoken (ietf-drums-token-to-list ietf-drums-tspecials))
(ntoken (ietf-drums-token-to-list "0-9"))
(prev-value "")
display-name mailbox c display-string parameters
attribute value type subtype number encoded
prev-attribute)
(ietf-drums-init (mail-header-remove-whitespace
(mail-header-remove-comments string)))
(let ((table (copy-syntax-table ietf-drums-syntax-table)))
(modify-syntax-entry ?\' "w" table)
;; The following isn't valid, but one should be liberal
;; in what one receives.
(modify-syntax-entry ?\: "w" table)
(set-syntax-table table))
(setq c (char-after))
(when (and (memq c ttoken)
(not (memq c stoken)))
(setq type (downcase (buffer-substring
(point) (progn (forward-sexp 1) (point)))))
;; Do the params
(while (not (eobp))
(setq c (char-after))
(unless (eq c ?\;)
(error "Invalid header: %s" string))
(forward-char 1)
;; If c in nil, then this is an invalid header, but
;; since elm generates invalid headers on this form,
;; we allow it.
(when (setq c (char-after))
(if (and (memq c ttoken)
(not (memq c stoken)))
(setq attribute
(intern
(downcase
(buffer-substring
(point) (progn (forward-sexp 1) (point))))))
(error "Invalid header: %s" string))
(setq c (char-after))
(setq encoded nil)
(when (eq c ?*)
(forward-char 1)
(setq c (char-after))
(when (memq c ntoken)
(setq number
(string-to-number
(buffer-substring
(point) (progn (forward-sexp 1) (point)))))
(setq c (char-after))
(when (eq c ?*)
(setq encoded t)
(forward-char 1)
(setq c (char-after)))))
;; See if we have any previous continuations.
(when (and prev-attribute
(not (eq prev-attribute attribute)))
(push (cons prev-attribute prev-value) parameters)
(setq prev-attribute nil
prev-value ""))
(unless (eq c ?=)
(error "Invalid header: %s" string))
(forward-char 1)
(setq c (char-after))
(cond
((eq c ?\")
(setq value
(buffer-substring (1+ (point))
(progn (forward-sexp 1) (1- (point))))))
((and (memq c ttoken)
(not (memq c stoken)))
(setq value (buffer-substring
(point) (progn (forward-sexp 1) (point)))))
(t
(error "Invalid header: %s" string)))
(when encoded
(setq value (rfc2231-decode-encoded-string value)))
(if number
(setq prev-attribute attribute
prev-value (concat prev-value value))
(push (cons attribute value) parameters))))
;; Take care of any final continuations.
(when prev-attribute
(push (cons prev-attribute prev-value) parameters))
(when type
`(,type ,@(nreverse parameters)))))))
(defun rfc2231-decode-encoded-string (string)
"Decode an RFC2231-encoded string.
These look like \"us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A\"."
(with-temp-buffer
(let ((elems (split-string string "'")))
;; The encoded string may contain zero to two single-quote
;; marks. This should give us the encoded word stripped
;; of any preceding values.
(insert (car (last elems)))
(goto-char (point-min))
(while (search-forward "%" nil t)
(insert
(prog1
(string-to-number (buffer-substring (point) (+ (point) 2)) 16)
(delete-region (1- (point)) (+ (point) 2)))))
;; Encode using the charset, if any.
(when (and (< (length elems) 1)
(not (equal (intern (car elems)) 'us-ascii)))
(mm-decode-coding-region (point-min) (point-max)
(intern (car elems))))
(buffer-string))))
(defun rfc2231-encode-string (param value)
"Return and PARAM=VALUE string encoded according to RFC2231."
(let ((control (ietf-drums-token-to-list ietf-drums-no-ws-ctl-token))
(tspecial (ietf-drums-token-to-list ietf-drums-tspecials))
(special (ietf-drums-token-to-list "*'%\n\t"))
(ascii (ietf-drums-token-to-list ietf-drums-text-token))
(num -1)
spacep encodep charsetp charset broken)
(with-temp-buffer
(insert value)
(goto-char (point-min))
(while (not (eobp))
(cond
((or (memq (following-char) control)
(memq (following-char) tspecial)
(memq (following-char) special))
(setq encodep t))
((eq (following-char) ? )
(setq spacep t))
((not (memq (following-char) ascii))
(setq charsetp t)))
(forward-char 1))
(when charsetp
(setq charset (mm-encode-body)))
(cond
((or encodep charsetp)
(goto-char (point-min))
(while (not (eobp))
(when (> (current-column) 60)
(insert "\n")
(setq broken t))
(if (or (not (memq (following-char) ascii))
(memq (following-char) control)
(memq (following-char) tspecial)
(memq (following-char) special)
(eq (following-char) ? ))
(progn
(insert "%" (format "%02x" (following-char)))
(delete-char 1))
(forward-char 1)))
(goto-char (point-min))
(insert (or charset "ascii") "''")
(goto-char (point-min))
(if (not broken)
(insert param "*=")
(while (not (eobp))
(insert param "*" (format "%d" (incf num)) "*=")
(forward-line 1))))
(spacep
(goto-char (point-min))
(insert param "=\"")
(goto-char (point-max))
(insert "\""))
(t
(goto-char (point-min))
(insert param "=")))
(buffer-string))))
(provide 'rfc2231)
;;; arch-tag: c3ab751d-d108-406a-b301-68882ad8cd63
;;; rfc2231.el ends here
|
