1 ;;; mel-b-ccl.el: CCL based encoder/decoder of Base64
3 ;; Copyright (C) 1998 Tanaka Akira
5 ;; Author: Tanaka Akira <akr@jaist.ac.jp>
7 ;; Keywords: MIME, Base64
9 ;; This file is part of FLIM (Faithful Library about Internet Message).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
38 (defconst mel-ccl-4-table
41 (defconst mel-ccl-16-table
42 '( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15))
44 (defconst mel-ccl-64-table
45 '( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
46 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
47 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
48 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63))
50 (defconst mel-ccl-256-table
51 '( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
52 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
53 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
54 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
55 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
56 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
57 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
58 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
59 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
60 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
61 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
62 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
63 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
64 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
65 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
66 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255))
68 (defconst mel-ccl-256-to-64-table
69 '(nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
70 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
71 nil nil nil nil nil nil nil nil nil nil nil 62 nil nil nil 63
72 52 53 54 55 56 57 58 59 60 61 nil nil nil t nil nil
73 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
74 15 16 17 18 19 20 21 22 23 24 25 nil nil nil nil nil
75 nil 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
76 41 42 43 44 45 46 47 48 49 50 51 nil nil nil nil nil
77 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
78 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
79 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
80 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
81 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
82 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
83 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
84 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil))
86 (defconst mel-ccl-64-to-256-table
89 "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
90 abcdefghijklmnopqrstuvwxyz\
102 (defun mel-ccl-decode-b-bit-ex (v)
104 (lsh (logand v (lsh 255 16)) -16)
105 (logand v (lsh 255 8))
106 (lsh (logand v 255) 16)))
108 (defconst mel-ccl-decode-b-0-table
113 (mel-ccl-decode-b-bit-ex (lsh v 18))
115 mel-ccl-256-to-64-table)))
117 (defconst mel-ccl-decode-b-1-table
122 (mel-ccl-decode-b-bit-ex (lsh v 12))
124 mel-ccl-256-to-64-table)))
126 (defconst mel-ccl-decode-b-2-table
131 (mel-ccl-decode-b-bit-ex (lsh v 6))
133 mel-ccl-256-to-64-table)))
135 (defconst mel-ccl-decode-b-3-table
140 (mel-ccl-decode-b-bit-ex v)
142 mel-ccl-256-to-64-table)))
146 (if-broken ccl-cascading-read
147 (define-ccl-program mel-ccl-decode-b
156 ((or (eq v nil) (eq v t)) '(repeat))
157 (t `((r0 = ,(lsh v 2)) (break)))))
158 mel-ccl-256-to-64-table)))
165 ((or (eq v nil) (eq v t)) '(repeat))
166 ((= (lsh v -4) 0) `((write r0) (r0 = ,(lsh (logand v 15) 4)) (break)))
167 (t `((r0 |= ,(lsh v -4)) (write r0) (r0 = ,(lsh (logand v 15) 4)) (break)))))
168 mel-ccl-256-to-64-table)))
175 ((eq v nil) '(repeat))
177 ((= (lsh v -2) 0) `((write r0) (r0 = ,(lsh (logand v 3) 6)) (break)))
178 (t `((r0 |= ,(lsh v -2)) (write r0) (r0 = ,(lsh (logand v 3) 6)) (break)))))
179 mel-ccl-256-to-64-table)))
186 ((eq v nil) '(repeat))
188 (t `((r0 |= ,v) (write r0) (break)))))
189 mel-ccl-256-to-64-table)))
191 (define-ccl-program mel-ccl-decode-b
195 (r4 = r0 ,mel-ccl-decode-b-0-table)
196 (r5 = r1 ,mel-ccl-decode-b-1-table)
198 (r5 = r2 ,mel-ccl-decode-b-2-table)
200 (r5 = r3 ,mel-ccl-decode-b-3-table)
202 (if (r4 & ,(lognot (1- (lsh 1 24))))
204 (if (r4 & ,(lsh 1 24))
205 ((r0 = r1) (r1 = r2) (r2 = r3) (read r3)
206 (r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
207 (r5 = r3 ,mel-ccl-decode-b-3-table)
212 (if (r4 & ,(lsh 1 25))
213 ((r1 = r2) (r2 = r3) (read r3)
214 (r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
215 (r5 = r3 ,mel-ccl-decode-b-3-table)
221 (if (r4 & ,(lsh 1 26))
223 (r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
224 (r5 = r3 ,mel-ccl-decode-b-3-table)
233 (if (r4 & ,(lsh 1 27))
235 (r4 = r3 ,mel-ccl-decode-b-3-table)
240 (r4 = r0 ,mel-ccl-decode-b-0-table)
241 (r5 = r1 ,mel-ccl-decode-b-1-table)
246 ((r5 = r2 ,mel-ccl-decode-b-2-table)
248 (r5 = r3 ,mel-ccl-decode-b-3-table)
259 ((r5 = r2 ,mel-ccl-decode-b-2-table)
264 (end) ; Excessive (end) is workaround for XEmacs 21.0.
265 ; Without this, "AAA=" is converted to "^@^@^@".
274 (write-repeat r4))))))
279 ;; Generated CCL program works not properly on 20.2 because CCL_EOF_BLOCK
281 (defun mel-ccl-encode-base64-generic
282 (&optional quantums-per-line output-crlf terminate-with-newline)
291 `((write ,(nth (lsh r1 -2) mel-ccl-64-to-256-table))
292 (r0 = ,(logand r1 3))))
299 `((write r0 ,(vconcat
302 (nth (logior (lsh r0 4)
304 mel-ccl-64-to-256-table))
306 (r0 = ,(logand r1 15))))
313 `((write r0 ,(vconcat
316 (nth (logior (lsh r0 2)
318 mel-ccl-64-to-256-table))
319 mel-ccl-16-table)))))
325 (nth r1 mel-ccl-64-to-256-table))
328 ,@(when quantums-per-line
329 `((if (r3 == ,quantums-per-line)
330 ((write ,(if output-crlf "\r\n" "\n"))
335 ,(if terminate-with-newline
336 `(if (r3 > 0) (write ,(if output-crlf "\r\n" "\n")))
341 (nth (lsh r0 4) mel-ccl-64-to-256-table))
343 (write ,(if terminate-with-newline
344 (if output-crlf "==\r\n" "==\n")
349 (nth (lsh r0 2) mel-ccl-64-to-256-table))
351 (write ,(if terminate-with-newline
352 (if output-crlf "=\r\n" "=\n")
357 (define-ccl-program mel-ccl-encode-b
358 (mel-ccl-encode-base64-generic))
361 (define-ccl-program mel-ccl-encode-base64-crlf-crlf
362 (mel-ccl-encode-base64-generic 19 t))
364 (define-ccl-program mel-ccl-encode-base64-crlf-lf
365 (mel-ccl-encode-base64-generic 19 nil))
371 (make-ccl-coding-system
372 'mel-ccl-b-rev ?B "MIME B-encoding (reversed)"
373 'mel-ccl-encode-b 'mel-ccl-decode-b)
375 (make-ccl-coding-system
376 'mel-ccl-base64-crlf-rev
377 ?B "MIME Base64-encoding (reversed)"
378 'mel-ccl-encode-base64-crlf-crlf
381 (make-ccl-coding-system
382 'mel-ccl-base64-lf-rev
383 ?B "MIME Base64-encoding (LF encoding) (reversed)"
384 'mel-ccl-encode-base64-crlf-lf
391 (check-broken-facility ccl-execute-eof-block-on-decoding-some)
393 (unless-broken ccl-execute-eof-block-on-decoding-some
395 (defun base64-ccl-encode-string (string)
396 "Encode STRING with base64 encoding."
397 (decode-coding-string string 'mel-ccl-base64-lf-rev))
399 (defun base64-ccl-encode-region (start end)
400 "Encode region from START to END with base64 encoding."
402 (decode-coding-region start end 'mel-ccl-base64-lf-rev))
404 (defun base64-ccl-insert-encoded-file (filename)
405 "Encode contents of file FILENAME to base64, and insert the result."
406 (interactive (list (read-file-name "Insert encoded file: ")))
407 (let ((coding-system-for-read 'mel-ccl-base64-lf-rev))
408 (insert-file-contents filename)))
410 (mel-define-method-function (mime-encode-string string (nil "base64"))
411 'base64-ccl-encode-string)
412 (mel-define-method-function (mime-encode-region start end (nil "base64"))
413 'base64-ccl-encode-region)
414 (mel-define-method-function
415 (mime-insert-encoded-file filename (nil "base64"))
416 'base64-ccl-insert-encoded-file)
418 (mel-define-method-function (encoded-text-encode-string string (nil "B"))
419 'base64-ccl-encode-string)
422 (defun base64-ccl-decode-string (string)
423 "Decode base64 encoded STRING"
424 (encode-coding-string string 'mel-ccl-b-rev))
426 (defun base64-ccl-decode-region (start end)
427 "Decode base64 encoded the region from START to END."
429 (encode-coding-region start end 'mel-ccl-b-rev))
431 (defun base64-ccl-write-decoded-region (start end filename)
432 "Decode the region from START to END and write out to FILENAME."
434 (list (region-beginning) (region-end)
435 (read-file-name "Write decoded region to file: ")))
436 (let ((coding-system-for-write 'mel-ccl-b-rev)
437 jka-compr-compression-info-list)
438 (write-region start end filename)))
440 (mel-define-method-function (mime-decode-string string (nil "base64"))
441 'base64-ccl-decode-string)
442 (mel-define-method-function (mime-decode-region start end (nil "base64"))
443 'base64-ccl-decode-region)
444 (mel-define-method-function
445 (mime-write-decoded-region start end filename (nil "base64"))
446 'base64-ccl-write-decoded-region)
448 (mel-define-method encoded-text-decode-string (string (nil "B"))
449 (if (and (string-match B-encoded-text-regexp string)
450 (string= string (match-string 0 string)))
451 (base64-ccl-decode-string string)
452 (error "Invalid encoded-text %s" string)))
460 ;;; mel-b-ccl.el ends here