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715a2ca2 | 1 | ;;; rfc2231.el --- functions for decoding rfc2231 headers |
c113de23 GM |
2 | |
3 | ;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org> | |
6 | ;; This file is part of GNU Emacs. | |
7 | ||
8 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
9 | ;; it under the terms of the GNU General Public License as published by | |
10 | ;; the Free Software Foundation; either version 2, or (at your option) | |
11 | ;; any later version. | |
12 | ||
13 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
14 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ;; GNU General Public License for more details. | |
17 | ||
18 | ;; You should have received a copy of the GNU General Public License | |
19 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
20 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | ;; Boston, MA 02111-1307, USA. | |
22 | ||
23 | ;;; Commentary: | |
24 | ||
25 | ;;; Code: | |
26 | ||
e017ba35 | 27 | (eval-when-compile (require 'cl)) |
c113de23 GM |
28 | (require 'ietf-drums) |
29 | ||
30 | (defun rfc2231-get-value (ct attribute) | |
31 | "Return the value of ATTRIBUTE from CT." | |
32 | (cdr (assq attribute (cdr ct)))) | |
33 | ||
34 | (defun rfc2231-parse-string (string) | |
35 | "Parse STRING and return a list. | |
36 | The list will be on the form | |
37 | `(name (attribute . value) (attribute . value)...)" | |
38 | (with-temp-buffer | |
39 | (let ((ttoken (ietf-drums-token-to-list ietf-drums-text-token)) | |
40 | (stoken (ietf-drums-token-to-list ietf-drums-tspecials)) | |
41 | (ntoken (ietf-drums-token-to-list "0-9")) | |
42 | (prev-value "") | |
43 | display-name mailbox c display-string parameters | |
44 | attribute value type subtype number encoded | |
45 | prev-attribute) | |
46 | (ietf-drums-init (mail-header-remove-whitespace | |
47 | (mail-header-remove-comments string))) | |
48 | (let ((table (copy-syntax-table ietf-drums-syntax-table))) | |
49 | (modify-syntax-entry ?\' "w" table) | |
50 | ;; The following isn't valid, but one should be liberal | |
51 | ;; in what one receives. | |
52 | (modify-syntax-entry ?\: "w" table) | |
53 | (set-syntax-table table)) | |
54 | (setq c (char-after)) | |
55 | (when (and (memq c ttoken) | |
56 | (not (memq c stoken))) | |
57 | (setq type (downcase (buffer-substring | |
58 | (point) (progn (forward-sexp 1) (point))))) | |
59 | ;; Do the params | |
60 | (while (not (eobp)) | |
61 | (setq c (char-after)) | |
62 | (unless (eq c ?\;) | |
63 | (error "Invalid header: %s" string)) | |
64 | (forward-char 1) | |
65 | ;; If c in nil, then this is an invalid header, but | |
66 | ;; since elm generates invalid headers on this form, | |
67 | ;; we allow it. | |
68 | (when (setq c (char-after)) | |
69 | (if (and (memq c ttoken) | |
70 | (not (memq c stoken))) | |
71 | (setq attribute | |
72 | (intern | |
73 | (downcase | |
74 | (buffer-substring | |
75 | (point) (progn (forward-sexp 1) (point)))))) | |
76 | (error "Invalid header: %s" string)) | |
77 | (setq c (char-after)) | |
78 | (setq encoded nil) | |
79 | (when (eq c ?*) | |
80 | (forward-char 1) | |
81 | (setq c (char-after)) | |
82 | (when (memq c ntoken) | |
83 | (setq number | |
84 | (string-to-number | |
85 | (buffer-substring | |
86 | (point) (progn (forward-sexp 1) (point))))) | |
87 | (setq c (char-after)) | |
88 | (when (eq c ?*) | |
89 | (setq encoded t) | |
90 | (forward-char 1) | |
91 | (setq c (char-after))))) | |
92 | ;; See if we have any previous continuations. | |
93 | (when (and prev-attribute | |
94 | (not (eq prev-attribute attribute))) | |
95 | (push (cons prev-attribute prev-value) parameters) | |
96 | (setq prev-attribute nil | |
97 | prev-value "")) | |
98 | (unless (eq c ?=) | |
99 | (error "Invalid header: %s" string)) | |
100 | (forward-char 1) | |
101 | (setq c (char-after)) | |
102 | (cond | |
103 | ((eq c ?\") | |
104 | (setq value | |
105 | (buffer-substring (1+ (point)) | |
106 | (progn (forward-sexp 1) (1- (point)))))) | |
107 | ((and (memq c ttoken) | |
108 | (not (memq c stoken))) | |
109 | (setq value (buffer-substring | |
110 | (point) (progn (forward-sexp 1) (point))))) | |
111 | (t | |
112 | (error "Invalid header: %s" string))) | |
113 | (when encoded | |
114 | (setq value (rfc2231-decode-encoded-string value))) | |
115 | (if number | |
116 | (setq prev-attribute attribute | |
117 | prev-value (concat prev-value value)) | |
118 | (push (cons attribute value) parameters)))) | |
119 | ||
120 | ;; Take care of any final continuations. | |
121 | (when prev-attribute | |
122 | (push (cons prev-attribute prev-value) parameters)) | |
123 | ||
124 | (when type | |
125 | `(,type ,@(nreverse parameters))))))) | |
126 | ||
127 | (defun rfc2231-decode-encoded-string (string) | |
128 | "Decode an RFC2231-encoded string. | |
129 | These look like \"us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A\"." | |
130 | (with-temp-buffer | |
131 | (let ((elems (split-string string "'"))) | |
132 | ;; The encoded string may contain zero to two single-quote | |
133 | ;; marks. This should give us the encoded word stripped | |
134 | ;; of any preceding values. | |
135 | (insert (car (last elems))) | |
136 | (goto-char (point-min)) | |
137 | (while (search-forward "%" nil t) | |
138 | (insert | |
139 | (prog1 | |
140 | (string-to-number (buffer-substring (point) (+ (point) 2)) 16) | |
141 | (delete-region (1- (point)) (+ (point) 2))))) | |
142 | ;; Encode using the charset, if any. | |
143 | (when (and (< (length elems) 1) | |
144 | (not (equal (intern (car elems)) 'us-ascii))) | |
145 | (mm-decode-coding-region (point-min) (point-max) | |
146 | (intern (car elems)))) | |
147 | (buffer-string)))) | |
148 | ||
149 | (defun rfc2231-encode-string (param value) | |
150 | "Return and PARAM=VALUE string encoded according to RFC2231." | |
151 | (let ((control (ietf-drums-token-to-list ietf-drums-no-ws-ctl-token)) | |
152 | (tspecial (ietf-drums-token-to-list ietf-drums-tspecials)) | |
153 | (special (ietf-drums-token-to-list "*'%\n\t")) | |
154 | (ascii (ietf-drums-token-to-list ietf-drums-text-token)) | |
155 | (num -1) | |
156 | spacep encodep charsetp charset broken) | |
157 | (with-temp-buffer | |
158 | (insert value) | |
159 | (goto-char (point-min)) | |
160 | (while (not (eobp)) | |
161 | (cond | |
162 | ((or (memq (following-char) control) | |
163 | (memq (following-char) tspecial) | |
164 | (memq (following-char) special)) | |
165 | (setq encodep t)) | |
166 | ((eq (following-char) ? ) | |
167 | (setq spacep t)) | |
168 | ((not (memq (following-char) ascii)) | |
169 | (setq charsetp t))) | |
170 | (forward-char 1)) | |
171 | (when charsetp | |
172 | (setq charset (mm-encode-body))) | |
173 | (cond | |
174 | ((or encodep charsetp) | |
175 | (goto-char (point-min)) | |
176 | (while (not (eobp)) | |
177 | (when (> (current-column) 60) | |
178 | (insert "\n") | |
179 | (setq broken t)) | |
180 | (if (or (not (memq (following-char) ascii)) | |
181 | (memq (following-char) control) | |
182 | (memq (following-char) tspecial) | |
183 | (memq (following-char) special) | |
184 | (eq (following-char) ? )) | |
185 | (progn | |
186 | (insert "%" (format "%02x" (following-char))) | |
187 | (delete-char 1)) | |
188 | (forward-char 1))) | |
189 | (goto-char (point-min)) | |
190 | (insert (or charset "ascii") "''") | |
191 | (goto-char (point-min)) | |
192 | (if (not broken) | |
193 | (insert param "*=") | |
194 | (while (not (eobp)) | |
195 | (insert param "*" (format "%d" (incf num)) "*=") | |
196 | (forward-line 1)))) | |
197 | (spacep | |
198 | (goto-char (point-min)) | |
199 | (insert param "=\"") | |
200 | (goto-char (point-max)) | |
201 | (insert "\"")) | |
202 | (t | |
203 | (goto-char (point-min)) | |
204 | (insert param "="))) | |
205 | (buffer-string)))) | |
206 | ||
207 | (provide 'rfc2231) | |
208 | ||
209 | ;;; rfc2231.el ends here |