1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
|
;;; rfc2231.el --- Functions for decoding rfc2231 headers
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
;; 2006, 2007, 2008 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 3, 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(require 'ietf-drums)
(require 'rfc2047)
(autoload 'mm-encode-body "mm-bodies")
(autoload 'mail-header-remove-whitespace "mail-parse")
(autoload 'mail-header-remove-comments "mail-parse")
(defun rfc2231-get-value (ct attribute)
"Return the value of ATTRIBUTE from CT."
(cdr (assq attribute (cdr ct))))
(defun rfc2231-parse-qp-string (string)
"Parse QP-encoded string using `rfc2231-parse-string'.
N.B. This is in violation with RFC2047, but it seem to be in common use."
(rfc2231-parse-string (rfc2047-decode-string string)))
(defun rfc2231-parse-string (string &optional signal-error)
"Parse STRING and return a list.
The list will be on the form
`(name (attribute . value) (attribute . value)...)'.
If the optional SIGNAL-ERROR is non-nil, signal an error when this
function fails in parsing of parameters. Otherwise, this function
must never cause a Lisp error."
(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"))
c type attribute encoded number parameters value)
(ietf-drums-init
(condition-case nil
(mail-header-remove-whitespace
(mail-header-remove-comments string))
;; The most likely cause of an error is unbalanced parentheses
;; or double-quotes. If all parentheses and double-quotes are
;; quoted meaninglessly with backslashes, removing them might
;; make it parseable. Let's try...
(error
(let (mod)
(when (and (string-match "\\\\\"" string)
(not (string-match "\\`\"\\|[^\\]\"" string)))
(setq string (mm-replace-in-string string "\\\\\"" "\"")
mod t))
(when (and (string-match "\\\\(" string)
(string-match "\\\\)" string)
(not (string-match "\\`(\\|[^\\][()]" string)))
(setq string (mm-replace-in-string string "\\\\\\([()]\\)" "\\1")
mod t))
(or (and mod
(ignore-errors
(mail-header-remove-whitespace
(mail-header-remove-comments string))))
;; Finally, attempt to extract only type.
(if (string-match
(concat "\\`[\t\n ]*\\([^" ietf-drums-tspecials "\t\n ]+"
"\\(?:/[^" ietf-drums-tspecials
"\t\n ]+\\)?\\)\\(?:[\t\n ;]\\|\\'\\)")
string)
(match-string 1 string)
""))))))
(let ((table (copy-syntax-table ietf-drums-syntax-table)))
(modify-syntax-entry ?\' "w" table)
(modify-syntax-entry ?* " " table)
(modify-syntax-entry ?\; " " table)
(modify-syntax-entry ?= " " 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 (ignore-errors
(downcase
(buffer-substring (point) (progn
(forward-sexp 1)
(point)))))))
;; Do the params
(condition-case err
(progn
(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))
(if (eq c ?*)
(progn
(forward-char 1)
(setq c (char-after))
(if (not (memq c ntoken))
(setq encoded t
number nil)
(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)))))
(setq number nil
encoded nil))
(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)))))
(when encoded
(setq value (mapconcat (lambda (c) (format "%%%02x" c))
value ""))))
((and (or (memq c ttoken)
;; EXTENSION: Support non-ascii chars.
(> c ?\177))
(not (memq c stoken)))
(setq value
(buffer-substring
(point)
(progn
;; Jump over asterisk, non-ASCII
;; and non-boundary characters.
(while (and c
(or (eq c ?*)
(> c ?\177)
(not (eq (char-syntax c) ? ))))
(forward-char 1)
(setq c (char-after)))
(point)))))
(t
(error "Invalid header: %s" string)))
(push (list attribute value number encoded)
parameters))))
(error
(setq parameters nil)
(when signal-error
(signal (car err) (cdr err)))))
;; Now collect and concatenate continuation parameters.
(let ((cparams nil)
elem)
(loop for (attribute value part encoded)
in (sort parameters (lambda (e1 e2)
(< (or (caddr e1) 0)
(or (caddr e2) 0))))
do (if (or (not (setq elem (assq attribute cparams)))
(and (numberp part)
(zerop part)))
(push (list attribute value encoded) cparams)
(setcar (cdr elem) (concat (cadr elem) value))))
;; Finally decode encoded values.
(cons type (mapcar
(lambda (elem)
(cons (car elem)
(if (nth 2 elem)
(rfc2231-decode-encoded-string (nth 1 elem))
(nth 1 elem))))
(nreverse cparams))))))))
(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\",
\"us-ascii''This%20is%20%2A%2A%2Afun%2A%2A%2A\",
\"'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A\",
\"''This%20is%20%2A%2A%2Afun%2A%2A%2A\", or
\"This is ***fun***\"."
(string-match "\\`\\(?:\\([^']+\\)?'\\([^']+\\)?'\\)?\\(.+\\)" string)
(let ((coding-system (mm-charset-to-coding-system (match-string 1 string)))
;;(language (match-string 2 string))
(value (match-string 3 string)))
(mm-with-unibyte-buffer
(insert value)
(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)))))
;; Decode using the charset, if any.
(if (memq coding-system '(nil ascii))
(buffer-string)
(mm-decode-coding-string (buffer-string) coding-system)))))
(defun rfc2231-encode-string (param value)
"Return and PARAM=VALUE string encoded according to RFC2231.
Use `mml-insert-parameter' or `mml-insert-parameter-string' to insert
the result of this function."
(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)
;; Don't make lines exceeding 76 column.
(limit (- 74 (length param)))
spacep encodep charsetp charset broken)
(mm-with-multibyte-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)))
(mm-disable-multibyte)
(cond
((or encodep charsetp
(progn
(end-of-line)
(> (current-column) (if spacep (- limit 2) limit))))
(setq limit (- limit 6))
(goto-char (point-min))
(insert (symbol-name (or charset 'us-ascii)) "''")
(while (not (eobp))
(if (or (not (memq (following-char) ascii))
(memq (following-char) control)
(memq (following-char) tspecial)
(memq (following-char) special)
(eq (following-char) ? ))
(progn
(when (>= (current-column) (1- limit))
(insert ";\n")
(setq broken t))
(insert "%" (format "%02x" (following-char)))
(delete-char 1))
(when (> (current-column) limit)
(insert ";\n")
(setq broken t))
(forward-char 1)))
(goto-char (point-min))
(if (not broken)
(insert param "*=")
(while (not (eobp))
(insert (if (>= num 0) " " "")
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
|
