mel-q-ccl.el

   1 ;;; mel-q-ccl.el --- Quoted-Printable encoder/decoder using CCL.
   2
   3 ;; Copyright (C) 1998,1999 Tanaka Akira
   4
   5 ;; Author: Tanaka Akira <akr@jaist.ac.jp>
   6 ;; Created: 1998/9/17
   7 ;; Keywords: MIME, Quoted-Printable, Q-encoding
   8
   9 ;; This file is part of FLIM (Faithful Library about Internet Message).
  10
  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.
  15
  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.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with this program; 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.
  25
  26 ;;; Code:
  27
  28 (require 'ccl)
  29 (require 'pccl)
  30 (require 'mime-def)
  31
  32
  33 ;;; @ constants
  34 ;;;
  35
  36 (eval-when-compile
  37
  38 (defconst mel-ccl-16-table
  39   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15))
  40
  41 (defconst mel-ccl-28-table
  42   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
  43      16  17  18  19  20  21  22  23  24  25  26  27))
  44
  45 (defconst mel-ccl-256-table
  46   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
  47      16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31
  48      32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47
  49      48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63
  50      64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79
  51      80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95
  52      96  97  98  99 100 101 102 103 104 105 106 107 108 109 110 111
  53     112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
  54     128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
  55     144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
  56     160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
  57     176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
  58     192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
  59     208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
  60     224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
  61     240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255))
  62
  63 (defconst mel-ccl-256-to-16-table
  64   '(nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  65     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  66     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  67       0   1   2   3   4   5   6   7   8   9 nil nil nil nil nil nil
  68     nil  10  11  12  13  14  15 nil nil nil nil nil nil nil nil nil
  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 nil nil nil nil nil
  72     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  73     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  74     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  75     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  76     nil nil nil nil nil nil nil nil nil nil nil 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
  81 (defconst mel-ccl-16-to-256-table
  82   (mapcar 'char-int "0123456789ABCDEF"))
  83
  84 (defconst mel-ccl-high-table
  85   (vconcat
  86    (mapcar
  87     (lambda (v) (nth (lsh v -4) mel-ccl-16-to-256-table))
  88     mel-ccl-256-table)))
  89
  90 (defconst mel-ccl-low-table
  91   (vconcat
  92    (mapcar
  93     (lambda (v) (nth (logand v 15) mel-ccl-16-to-256-table))
  94     mel-ccl-256-table)))
  95
  96 (defconst mel-ccl-u-raw
  97   (mapcar
  98    'char-int
  99    "0123456789\
 100 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 101 abcdefghijklmnopqrstuvwxyz\
 102 !@#$%&'()*+,-./:;<>@[\\]^`{|}~"))
 103
 104 (defconst mel-ccl-c-raw
 105   (mapcar
 106    'char-int
 107    "0123456789\
 108 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 109 abcdefghijklmnopqrstuvwxyz\
 110 !@#$%&'*+,-./:;<>@[]^`{|}~"))
 111
 112 (defconst mel-ccl-p-raw
 113   (mapcar
 114    'char-int
 115    "0123456789\
 116 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 117 abcdefghijklmnopqrstuvwxyz\
 118 !*+-/"))
 119
 120 (defconst mel-ccl-qp-table
 121   [enc enc enc enc enc enc enc enc enc wsp lf  enc enc cr  enc enc
 122    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 123    wsp raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw
 124    raw raw raw raw raw raw raw raw raw raw raw raw raw enc raw raw
 125    raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw
 126    raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw
 127    raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw
 128    raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw enc
 129    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 130    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 131    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 132    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 133    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 134    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 135    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 136    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc])
 137
 138 )
 139
 140
 141 ;;; @ CCL programs
 142 ;;;
 143
 144 ;;; Q
 145
 146 (define-ccl-program mel-ccl-decode-q
 147   `(1
 148     ((loop
 149       (read-branch
 150        r0
 151        ,@(mapcar
 152           (lambda (r0)
 153             (cond
 154              ((= r0 (char-int ?_))
 155               `(write-repeat ? ))
 156              ((= r0 (char-int ?=))
 157               `((loop
 158                  (read-branch
 159                   r1
 160                   ,@(mapcar
 161                      (lambda (v)
 162                        (if (integerp v)
 163                            `((r0 = ,v) (break))
 164                          '(repeat)))
 165                      mel-ccl-256-to-16-table)))
 166                 (loop
 167                  (read-branch
 168                   r1
 169                   ,@(mapcar
 170                      (lambda (v)
 171                        (if (integerp v)
 172                            `((write r0 ,(vconcat
 173                                          (mapcar
 174                                           (lambda (r0)
 175                                             (logior (lsh r0 4) v))
 176                                           mel-ccl-16-table)))
 177                              (break))
 178                          '(repeat)))
 179                      mel-ccl-256-to-16-table)))
 180                 (repeat)))
 181              (t
 182               `(write-repeat ,r0))))
 183           mel-ccl-256-table))))))
 184
 185 (eval-when-compile
 186
 187 (defun mel-ccl-encode-q-generic (raw)
 188   `(3
 189     (loop
 190      (loop
 191       (read-branch
 192        r0
 193        ,@(mapcar
 194           (lambda (r0)
 195             (cond
 196              ((= r0 32) `(write-repeat ?_))
 197              ((member r0 raw) `(write-repeat ,r0))
 198              (t '(break))))
 199           mel-ccl-256-table)))
 200      (write ?=)
 201      (write r0 ,mel-ccl-high-table)
 202      (write r0 ,mel-ccl-low-table)
 203      (repeat))))
 204
 205 ;; On xemacs, generated program counts iso-8859-1 8bit character as 6bytes.
 206 (defun mel-ccl-count-q-length (raw)
 207   `(0
 208     ((r0 = 0)
 209      (loop
 210       (read-branch
 211        r1
 212        ,@(mapcar
 213           (lambda (r1)
 214             (if (or (= r1 32) (member r1 raw))
 215                 '((r0 += 1) (repeat))
 216               '((r0 += 3) (repeat))))
 217           mel-ccl-256-table))))))
 218
 219 )
 220
 221 (define-ccl-program mel-ccl-encode-uq
 222   (mel-ccl-encode-q-generic mel-ccl-u-raw))
 223 (define-ccl-program mel-ccl-encode-cq
 224   (mel-ccl-encode-q-generic mel-ccl-c-raw))
 225 (define-ccl-program mel-ccl-encode-pq
 226   (mel-ccl-encode-q-generic mel-ccl-p-raw))
 227
 228 (define-ccl-program mel-ccl-count-uq
 229   (mel-ccl-count-q-length mel-ccl-u-raw))
 230 (define-ccl-program mel-ccl-count-cq
 231   (mel-ccl-count-q-length mel-ccl-c-raw))
 232 (define-ccl-program mel-ccl-count-pq
 233   (mel-ccl-count-q-length mel-ccl-p-raw))
 234
 235 ;; Quoted-Printable
 236
 237 (eval-when-compile
 238
 239 (defvar eof-block-branches)
 240 (defvar eof-block-reg)
 241 (defun mel-ccl-set-eof-block (branch)
 242   (let ((p (assoc branch eof-block-branches)))
 243     (unless p
 244       (setq p (cons branch (length eof-block-branches))
 245             eof-block-branches (cons p eof-block-branches)))
 246     `(,eof-block-reg = ,(cdr p))))
 247
 248 )
 249
 250 (eval-when-compile
 251
 252 (defun mel-ccl-try-to-read-crlf (input-crlf reg
 253                                             succ
 254                                             cr-eof cr-fail
 255                                             lf-eof lf-fail
 256                                             crlf-eof crlf-fail)
 257   (if input-crlf
 258       `(,(mel-ccl-set-eof-block cr-eof)
 259         (read-if (,reg == ?\r)
 260           (,(mel-ccl-set-eof-block lf-eof)
 261            (read-if (,reg == ?\n)
 262              ,succ
 263              ,lf-fail))
 264           ,cr-fail))
 265     `(,(mel-ccl-set-eof-block crlf-eof)
 266       (read-if (,reg == ?\n)
 267         ,succ
 268         ,crlf-fail))))
 269
 270 )
 271
 272 (eval-when-compile
 273
 274 ;; Generated CCL program works not properly on 20.2 because CCL_EOF_BLOCK
 275 ;; is not executed.
 276 (defun mel-ccl-encode-quoted-printable-generic (input-crlf output-crlf)
 277   (let ((hard (if output-crlf "\r\n" "\n"))
 278         (soft (if output-crlf "=\r\n" "=\n"))
 279         (eof-block-branches nil)
 280         (eof-block-reg 'r4)
 281         (after-wsp 'r5)
 282         (column 'r6)
 283         (type 'r3)
 284         (current 'r0)
 285         (type-raw 0)
 286         (type-enc 1)
 287         (type-wsp 2)
 288         (type-brk 3)
 289         )
 290     `(4
 291       ((,column = 0)
 292        (,after-wsp = 0)
 293        ,(mel-ccl-set-eof-block '(end))
 294        (read r0)
 295        (loop    ; invariant: column <= 75
 296         (loop
 297          (loop
 298           (branch
 299            r0
 300            ,@(mapcar
 301               (lambda (r0)
 302                 (let ((tmp (aref mel-ccl-qp-table r0)))
 303                   (cond
 304                    ((eq r0 (char-int ?F))
 305                     `(if (,column == 0)
 306                          (,(mel-ccl-set-eof-block '((write "F") (end)))
 307                           (read-if (r0 == ?r)
 308                             (,(mel-ccl-set-eof-block '((write "Fr") (end)))
 309                              (read-if (r0 == ?o)
 310                                (,(mel-ccl-set-eof-block '((write "Fro") (end)))
 311                                 (read-if (r0 == ?m)
 312                                   (,(mel-ccl-set-eof-block '((write "From") (end)))
 313                                    (read-if (r0 == ? )
 314                                      ((,column = 7)
 315                                       (,after-wsp = 1)
 316                                       ,(mel-ccl-set-eof-block '((write "From=20") (end)))
 317                                       (read r0)
 318                                       (write-repeat "=46rom "))
 319                                      ((,column = 4)
 320                                       (write-repeat "From"))))
 321                                   ((,column = 3)
 322                                    (write-repeat "Fro"))))
 323                                ((,column = 2)
 324                                 (write-repeat "Fr"))))
 325                             ((,column = 1)
 326                              (write-repeat "F"))))
 327                        ((,type = ,type-raw) (break)) ; RAW
 328                        ))
 329                    ((eq r0 (char-int ?.))
 330                     `(if (,column == 0)
 331                          ,(mel-ccl-try-to-read-crlf
 332                             input-crlf 'r0
 333                             ;; "." CR LF (input-crlf: t)
 334                             ;; "." LF (input-crlf: nil)
 335                             `((write ,(concat "=2E" hard))
 336                               ,(mel-ccl-set-eof-block '(end))
 337                               (read r0)
 338                               (repeat))
 339                             ;; "." <EOF>
 340                             '((write ".") (end))
 341                             ;; "." noCR (input-crlf: t)
 342                             `((,column = 1)
 343                               (write-repeat "."))
 344                             ;; "." CR <EOF> (input-crlf: t)
 345                             '((write ".=0D") (end))
 346                             ;; "." CR noLF (input-crlf: t)
 347                             `((,column = 4)
 348                               (write-repeat ".=0D"))
 349                             ;; "." <EOF> (input-crlf: nil)
 350                             '((write ".") (end))
 351                             ;; "." noLF (input-crlf: nil)
 352                             `((,column = 1)
 353                               (write-repeat ".")))
 354                        ((,type = ,type-raw) (break)) ; RAW
 355                        ))
 356                    ((eq tmp 'raw) `((,type = ,type-raw) (break)))
 357                    ((eq tmp 'enc) `((,type = ,type-enc) (break)))
 358                    ((eq tmp 'wsp) `((,type = ,type-wsp) (break)))
 359                    ((eq tmp 'cr) `((,type = ,(if input-crlf type-brk type-enc))
 360                                    (break)))
 361                    ((eq tmp 'lf) `((,type = ,(if input-crlf type-enc type-brk))
 362                                    (break)))
 363                    )))
 364               mel-ccl-256-table)))
 365          ;; r0:type{raw,enc,wsp,brk}
 366          (branch
 367           ,type
 368           ;; r0:type-raw
 369           (if (,column < 75)
 370               ((,column += 1)
 371                (,after-wsp = 0)
 372                ,(mel-ccl-set-eof-block '(end))
 373                (write-read-repeat r0))
 374             ((r1 = (r0 + 0))
 375              (,after-wsp = 0)
 376              ,@(mel-ccl-try-to-read-crlf
 377                 input-crlf 'r0
 378                 `((,column = 0)
 379                   (write r1)
 380                   ,(mel-ccl-set-eof-block `((write ,hard) (end)))
 381                   (read r0)
 382                   (write-repeat ,hard))
 383                 '((write r1) (end))
 384                 `((,column = 1)
 385                   (write ,soft) (write-repeat r1))
 386                 `((write ,soft) (write r1) (write "=0D") (end))
 387                 `((,column = 4)
 388                   (write ,soft) (write r1) (write-repeat "=0D"))
 389                 '((write r1) (end))
 390                 `((,column = 1)
 391                   (write ,soft) (write-repeat r1)))))
 392           ;; r0:type-enc
 393           ((,after-wsp = 0)
 394            (if (,column < 73)
 395                ((,column += 3)
 396                 (write "=")
 397                 (write r0 ,mel-ccl-high-table)
 398                 ,(mel-ccl-set-eof-block '(end))
 399                 (write-read-repeat r0 ,mel-ccl-low-table))
 400              (if (,column < 74)
 401                  ((r1 = (r0 + 0))
 402                   (,after-wsp = 0)
 403                   ,@(mel-ccl-try-to-read-crlf
 404                      input-crlf 'r0
 405                      `((,column = 0)
 406                        (write "=")
 407                        (write r1 ,mel-ccl-high-table)
 408                        (write r1 ,mel-ccl-low-table)
 409                        (write ,hard)
 410                        ,(mel-ccl-set-eof-block '(end))
 411                        (read r0)
 412                        (repeat))
 413                      `((write "=")
 414                        (write r1 ,mel-ccl-high-table)
 415                        (write r1 ,mel-ccl-low-table)
 416                        (end))
 417                      `((,column = 3)
 418                        (write ,(concat soft "="))
 419                        (write r1 ,mel-ccl-high-table)
 420                        (write r1 ,mel-ccl-low-table)
 421                        (repeat))
 422                      `((write ,(concat soft "="))
 423                        (write r1 ,mel-ccl-high-table)
 424                        (write r1 ,mel-ccl-low-table)
 425                        (write "=0D")
 426                        (end))
 427                      `((,column = 6)
 428                        (write ,(concat soft "="))
 429                        (write r1 ,mel-ccl-high-table)
 430                        (write r1 ,mel-ccl-low-table)
 431                        (write-repeat "=0D"))
 432                      `((write "=")
 433                        (write r1 ,mel-ccl-high-table)
 434                        (write r1 ,mel-ccl-low-table)
 435                        (end))
 436                      `((,column = 3)
 437                        (write ,(concat soft "="))
 438                        (write r1 ,mel-ccl-high-table)
 439                        (write r1 ,mel-ccl-low-table)
 440                        (repeat))))
 441                ((,column = 3)
 442                 (write ,(concat soft "="))
 443                 (write r0 ,mel-ccl-high-table)
 444                 ,(mel-ccl-set-eof-block '(end))
 445                 (write-read-repeat r0 ,mel-ccl-low-table)))))
 446           ;; r0:type-wsp
 447           (if (,column < 73)
 448               ((r1 = (r0 + 0))
 449                ,@(mel-ccl-try-to-read-crlf
 450                   input-crlf 'r0
 451                   `((,column = 0)
 452                     (,after-wsp = 0)
 453                     (write "=")
 454                     (write r1 ,mel-ccl-high-table)
 455                     (write r1 ,mel-ccl-low-table)
 456                     (write ,hard)
 457                     ,(mel-ccl-set-eof-block `(end))
 458                     (read r0)
 459                     (repeat))
 460                   `((write "=")
 461                     (write r1 ,mel-ccl-high-table)
 462                     (write r1 ,mel-ccl-low-table)
 463                     (end))
 464                   `((,column += 1)
 465                     (,after-wsp = 1)
 466                     (write-repeat r1))
 467                   `((write r1)
 468                     (write "=0D")
 469                     (end))
 470                   `((,column += 4)
 471                     (,after-wsp = 0)
 472                     (write r1)
 473                     (write-repeat "=0D"))
 474                   `((write "=")
 475                     (write r1 ,mel-ccl-high-table)
 476                     (write r1 ,mel-ccl-low-table)
 477                     (end))
 478                   `((,column += 1)
 479                     (,after-wsp = 1)
 480                     (write-repeat r1))))
 481             (if (,column < 74)
 482                 ((r1 = (r0 + 0))
 483                  ,@(mel-ccl-try-to-read-crlf
 484                     input-crlf 'r0
 485                     `((,column = 0)
 486                       (,after-wsp = 0)
 487                       (write "=")
 488                       (write r1 ,mel-ccl-high-table)
 489                       (write r1 ,mel-ccl-low-table)
 490                       (write ,hard)
 491                       ,(mel-ccl-set-eof-block `(end))
 492                       (read r0)
 493                       (repeat))
 494                     `((write "=")
 495                       (write r1 ,mel-ccl-high-table)
 496                       (write r1 ,mel-ccl-low-table)
 497                       (end))
 498                     `((,column += 1)
 499                       (,after-wsp = 1)
 500                       (write-repeat r1))
 501                     `((write r1)
 502                       (write ,(concat soft "=0D"))
 503                       (end))
 504                     `((,column = 3)
 505                       (,after-wsp = 0)
 506                       (write r1)
 507                       (write-repeat ,(concat soft "=0D")))
 508                     `((write "=")
 509                       (write r1 ,mel-ccl-high-table)
 510                       (write r1 ,mel-ccl-low-table)
 511                       (end))
 512                     `((,column += 1)
 513                       (,after-wsp = 1)
 514                       (write-repeat r1))))
 515               (if (,column < 75)
 516                   ((,column += 1)
 517                    (,after-wsp = 1)
 518                    ,(mel-ccl-set-eof-block `((write ,soft) (end)))
 519                    (write-read-repeat r0))
 520                 ((write ,soft)
 521                  (,column = 0)
 522                  (,after-wsp = 0)
 523                  (repeat)))))
 524           ;; r0:type-brk
 525           ,(if input-crlf
 526                ;; r0{CR}:type-brk
 527                `((if ((,column > 73) & ,after-wsp)
 528                      ((,column = 0)
 529                       (,after-wsp = 0)
 530                       (write ,soft)))
 531                  ,(mel-ccl-set-eof-block `((if (,column > 73) (write ,soft))
 532                                            (write "=0D") (end)))
 533                  (read-if (r0 == ?\n)
 534                    (if ,after-wsp
 535                        ((,after-wsp = 0)
 536                         (,column = 0)
 537                         (write ,(concat soft hard))
 538                         ,(mel-ccl-set-eof-block '(end))
 539                         (read r0)
 540                         (repeat))
 541                      ((,after-wsp = 0)
 542                       (,column = 0)
 543                       (write ,hard)
 544                       ,(mel-ccl-set-eof-block '(end))
 545                       (read r0)
 546                       (repeat)))
 547                    (if (,column < 73)
 548                        ((,after-wsp = 0)
 549                         (,column += 3)
 550                         (write-repeat "=0D"))
 551                      (if (,column < 74)
 552                          (if (r0 == ?\r)
 553                              ((,after-wsp = 0)
 554                               ,(mel-ccl-set-eof-block
 555                                 `((write ,(concat soft "=0D=0D")) (end)))
 556                               (read-if (r0 == ?\n)
 557                                 ((,column = 0)
 558                                  ,(mel-ccl-set-eof-block
 559                                    `((write ,(concat "=0D" hard)) (end)))
 560                                  (read r0)
 561                                  (write-repeat ,(concat "=0D" hard)))
 562                                 ((,column = 6)
 563                                  (write-repeat ,(concat soft "=0D=0D")))))
 564                            ((,after-wsp = 0)
 565                             (,column = 3)
 566                             (write-repeat ,(concat soft "=0D"))))
 567                        ((,after-wsp = 0)
 568                         (,column = 3)
 569                         (write-repeat ,(concat soft "=0D")))))))
 570              ;; r0{LF}:type-brk
 571              `(if ,after-wsp
 572                   ;; WSP ; r0{LF}:type-brk
 573                   ((,after-wsp = 0)
 574                    (,column = 0)
 575                    (write ,(concat soft (if output-crlf "\r" "")))
 576                    ,(mel-ccl-set-eof-block `(end))
 577                    (write-read-repeat r0))
 578                 ;; noWSP ; r0{LF}:type-brk
 579                 ((,after-wsp = 0)
 580                  (,column = 0)
 581                  ,@(if output-crlf '((write ?\r)) '())
 582                  ,(mel-ccl-set-eof-block `(end))
 583                  (write-read-repeat r0)))
 584              )))))
 585       (branch
 586        ,eof-block-reg
 587        ,@(reverse (mapcar 'car eof-block-branches))))))
 588
 589 (defun mel-ccl-decode-quoted-printable-generic (input-crlf output-crlf)
 590   `(1
 591     ((read r0)
 592      (loop
 593       (branch
 594        r0
 595        ,@(mapcar
 596           (lambda (r0)
 597             (let ((tmp (aref mel-ccl-qp-table r0)))
 598               (cond
 599                ((eq tmp 'raw) `(write-read-repeat r0))
 600                ((eq tmp 'wsp) (if (eq r0 (char-int ? ))
 601                                   `(r1 = 1)
 602                                 `(r1 = 0)))
 603                ((eq tmp 'cr)
 604                 (if input-crlf
 605                     ;; r0='\r'
 606                     `((read r0)
 607                       ;; '\r' r0
 608                       (if (r0 == ?\n)
 609                           ;; '\r' r0='\n'
 610                           ;; hard line break found.
 611                           ,(if output-crlf
 612                                '((write ?\r)
 613                                  (write-read-repeat r0))
 614                              '(write-read-repeat r0))
 615                         ;; '\r' r0:[^\n]
 616                         ;; invalid control character (bare CR) found.
 617                         ;; -> ignore it and rescan from r0.
 618                         (repeat)))
 619                   ;; r0='\r'
 620                   ;; invalid character (bare CR) found.
 621                   ;; -> ignore.
 622                   `((read r0)
 623                     (repeat))))
 624                ((eq tmp 'lf)
 625                 (if input-crlf
 626                     ;; r0='\n'
 627                     ;; invalid character (bare LF) found.
 628                     ;; -> ignore.
 629                     `((read r0)
 630                       (repeat))
 631                   ;; r0='\r\n'
 632                   ;; hard line break found.
 633                   (if output-crlf
 634                       '((write ?\r)
 635                         (write-read-repeat r0))
 636                     '(write-read-repeat r0))))
 637                ((eq r0 (char-int ?=))
 638                 ;; r0='='
 639                 `((read r0)
 640                   ;; '=' r0
 641                   (r1 = (r0 == ?\t))
 642                   (if ((r0 == ? ) | r1)
 643                       ;; '=' r0:[\t ]
 644                       ;; Skip transport-padding.
 645                       ;; It should check CR LF after
 646                       ;; transport-padding.
 647                       (loop
 648                        (read-if (r0 == ?\t)
 649                                 (repeat)
 650                                 (if (r0 == ? )
 651                                     (repeat)
 652                                   (break)))))
 653                   ;; '=' [\t ]* r0:[^\t ]
 654                   (branch
 655                    r0
 656                    ,@(mapcar
 657                       (lambda (r0)
 658                         (cond
 659                          ((eq r0 (char-int ?\r))
 660                           (if input-crlf
 661                               ;; '=' [\t ]* r0='\r'
 662                               `((read r0)
 663                                 ;; '=' [\t ]* '\r' r0
 664                                 (if (r0 == ?\n)
 665                                     ;; '=' [\t ]* '\r' r0='\n'
 666                                     ;; soft line break found.
 667                                     ((read r0)
 668                                      (repeat))
 669                                   ;; '=' [\t ]* '\r' r0:[^\n]
 670                                   ;; invalid input ->
 671                                   ;; output "=" and rescan from r0.
 672                                   ((write "=")
 673                                    (repeat))))
 674                             ;; '=' [\t ]* r0='\r'
 675                             ;; invalid input (bare CR found) ->
 676                             ;; output "=" and rescan from next.
 677                             `((write ?=)
 678                               (read r0)
 679                               (repeat))))
 680                          ((eq r0 (char-int ?\n))
 681                           (if input-crlf
 682                               ;; '=' [\t ]* r0='\n'
 683                               ;; invalid input (bare LF found) ->
 684                               ;; output "=" and rescan from next.
 685                               `((write ?=)
 686                                 (read r0)
 687                                 (repeat))
 688                             ;; '=' [\t ]* r0='\r\n'
 689                             ;; soft line break found.
 690                             `((read r0)
 691                               (repeat))))
 692                          ((setq tmp (nth r0 mel-ccl-256-to-16-table))
 693                           ;; '=' [\t ]* r0:[0-9A-F]
 694                           ;; upper nibble of hexadecimal digit found.
 695                           `((r1 = (r0 + 0))
 696                             (r0 = ,tmp)))
 697                          (t
 698                           ;; '=' [\t ]* r0:[^\r0-9A-F]
 699                           ;; invalid input ->
 700                           ;; output "=" and rescan from r0.
 701                           `((write ?=)
 702                             (repeat)))))
 703                       mel-ccl-256-table))
 704                   ;; '=' [\t ]* r1:r0:[0-9A-F]
 705                   (read-branch
 706                    r2
 707                    ,@(mapcar
 708                       (lambda (r2)
 709                         (if (setq tmp (nth r2 mel-ccl-256-to-16-table))
 710                             ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[0-9A-F]
 711                             `(write-read-repeat
 712                               r0
 713                               ,(vconcat
 714                                 (mapcar
 715                                  (lambda (r0)
 716                                    (logior (lsh r0 4) tmp))
 717                                  mel-ccl-16-table)))
 718                           ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 719                           ;; invalid input
 720                           `(r3 = 0)     ; nop
 721                           ))
 722                       mel-ccl-256-table))
 723                   ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 724                   ;; invalid input ->
 725                   ;; output "=" with hex digit and rescan from r2.
 726                   (write ?=)
 727                   (r0 = (r2 + 0))
 728                   (write-repeat r1)))
 729                (t
 730                 ;; r0:[^\t\r -~]
 731                 ;; invalid character found.
 732                 ;; -> ignore.
 733                 `((read r0)
 734                   (repeat))))))
 735           mel-ccl-256-table))
 736       ;; r1[0]:[\t ]
 737       (loop
 738        ,@(apply
 739           'append
 740           (mapcar
 741            (lambda (regnum)
 742              (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 743                (apply
 744                 'append
 745                 (mapcar
 746                  (lambda (bit)
 747                    (if (= bit 0)
 748                        (if (= regnum 0)
 749                            nil
 750                          `((read r0)
 751                            (if (r0 == ?\t)
 752                                (,reg = 0)
 753                              (if (r0 == ?\ )
 754                                  (,reg = 1)
 755                                ((r6 = ,(+ (* regnum 28) bit))
 756                                 (break))))))
 757                      `((read r0)
 758                        (if (r0 == ?\ )
 759                            (,reg |= ,(lsh 1 bit))
 760                          (if (r0 != ?\t)
 761                              ((r6 = ,(+ (* regnum 28) bit))
 762                               (break)))))))
 763                  mel-ccl-28-table))))
 764            '(0 1 2 3 4)))
 765        ;; white space buffer exhaust.
 766        ;; error: line length limit (76bytes) violation.
 767        ;; -> ignore these white spaces.
 768        (repeat))
 769       ,(if input-crlf
 770            `(if (r0 == ?\r)
 771                 ((read r0)
 772                  (if (r0 == ?\n)
 773                      ;; trailing white spaces found.
 774                      ;; -> ignore these white spacs.
 775                      ((write ,(if output-crlf "\r\n" "\n"))
 776                       (read r0)
 777                       (repeat))
 778                    ;; [\t ]* \r r0:[^\n]
 779                    ;; error: bare CR found.
 780                    ;; -> output white spaces and ignore bare CR.
 781                    ))
 782               ;; [\t ]* r0:[^\r]
 783               ;; middle white spaces found.
 784               )
 785          `(if (r0 == ?\n)
 786               ;; trailing white spaces found.
 787               ;; -> ignore these white spacs.
 788               ((write ,(if output-crlf "\r\n" "\n"))
 789                (read r0)
 790                (repeat))
 791             ;; [\t ]* r0:[^\n]
 792             ;; middle white spaces found.
 793             ))
 794       ,@(apply
 795          'append
 796          (mapcar
 797           (lambda (regnum)
 798             (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 799               (apply
 800                'append
 801                (mapcar
 802                 (lambda (bit)
 803                   `((if (,reg & ,(lsh 1 bit))
 804                         (write ?\ )
 805                       (write ?\t))
 806                     (if (r6 == ,(+ (* regnum 28) bit 1))
 807                         (repeat))))
 808                 mel-ccl-28-table))))
 809           '(0 1 2 3 4)))
 810       (repeat)
 811       ))))
 812
 813 )
 814
 815 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-crlf
 816   (mel-ccl-encode-quoted-printable-generic t t))
 817
 818 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-lf
 819   (mel-ccl-encode-quoted-printable-generic t nil))
 820
 821 (define-ccl-program mel-ccl-encode-quoted-printable-lf-crlf
 822   (mel-ccl-encode-quoted-printable-generic nil t))
 823
 824 (define-ccl-program mel-ccl-encode-quoted-printable-lf-lf
 825   (mel-ccl-encode-quoted-printable-generic nil nil))
 826
 827 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-crlf
 828   (mel-ccl-decode-quoted-printable-generic t t))
 829
 830 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-lf
 831   (mel-ccl-decode-quoted-printable-generic t nil))
 832
 833 (define-ccl-program mel-ccl-decode-quoted-printable-lf-crlf
 834   (mel-ccl-decode-quoted-printable-generic nil t))
 835
 836 (define-ccl-program mel-ccl-decode-quoted-printable-lf-lf
 837   (mel-ccl-decode-quoted-printable-generic nil nil))
 838
 839
 840 ;;; @ coding system
 841 ;;;
 842
 843 (make-ccl-coding-system
 844  'mel-ccl-uq-rev ?Q "MIME Q-encoding in unstructured field (reversed)"
 845  'mel-ccl-encode-uq 'mel-ccl-decode-q)
 846
 847 (make-ccl-coding-system
 848  'mel-ccl-cq-rev ?Q "MIME Q-encoding in comment (reversed)"
 849  'mel-ccl-encode-cq 'mel-ccl-decode-q)
 850
 851 (make-ccl-coding-system
 852  'mel-ccl-pq-rev ?Q "MIME Q-encoding in phrase (reversed)"
 853  'mel-ccl-encode-pq 'mel-ccl-decode-q)
 854
 855 (make-ccl-coding-system
 856  'mel-ccl-quoted-printable-crlf-crlf-rev
 857  ?Q "MIME Quoted-Printable-encoding (reversed)"
 858  'mel-ccl-encode-quoted-printable-crlf-crlf
 859  'mel-ccl-decode-quoted-printable-crlf-crlf)
 860
 861 (make-ccl-coding-system
 862  'mel-ccl-quoted-printable-lf-crlf-rev
 863  ?Q "MIME Quoted-Printable-encoding (LF encoding) (reversed)"
 864  'mel-ccl-encode-quoted-printable-crlf-lf
 865  'mel-ccl-decode-quoted-printable-lf-crlf)
 866
 867 (make-ccl-coding-system
 868  'mel-ccl-quoted-printable-crlf-lf-rev
 869  ?Q "MIME Quoted-Printable-encoding (LF internal) (reversed)"
 870  'mel-ccl-encode-quoted-printable-lf-crlf
 871  'mel-ccl-decode-quoted-printable-crlf-lf)
 872
 873 (make-ccl-coding-system
 874  'mel-ccl-quoted-printable-lf-lf-rev
 875  ?Q "MIME Quoted-Printable-encoding (LF encoding) (LF internal) (reversed)"
 876  'mel-ccl-encode-quoted-printable-lf-lf
 877  'mel-ccl-decode-quoted-printable-lf-lf)
 878
 879
 880 ;;; @ quoted-printable
 881 ;;;
 882
 883 (check-broken-facility ccl-execute-eof-block-on-decoding-some)
 884
 885 (unless-broken ccl-execute-eof-block-on-decoding-some
 886
 887   (defun quoted-printable-ccl-encode-string (string)
 888     "Encode STRING with quoted-printable encoding."
 889     (decode-coding-string
 890      string
 891      'mel-ccl-quoted-printable-lf-lf-rev))
 892
 893   (defun quoted-printable-ccl-encode-region (start end)
 894     "Encode the region from START to END with quoted-printable encoding."
 895     (interactive "*r")
 896     (decode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 897
 898   (defun quoted-printable-ccl-insert-encoded-file (filename)
 899     "Encode contents of the file named as FILENAME, and insert it."
 900     (interactive "*fInsert encoded file: ")
 901     (let ((coding-system-for-read 'mel-ccl-quoted-printable-lf-lf-rev)
 902           format-alist)
 903       (insert-file-contents filename)))
 904
 905   (mel-define-method-function
 906    (mime-encode-string string (nil "quoted-printable"))
 907    'quoted-printable-ccl-encode-string)
 908   (mel-define-method-function
 909    (mime-encode-region start end (nil "quoted-printable"))
 910    'quoted-printable-ccl-encode-region)
 911   (mel-define-method-function
 912    (mime-insert-encoded-file filename (nil "quoted-printable"))
 913    'quoted-printable-ccl-insert-encoded-file)
 914   )
 915
 916 (defun quoted-printable-ccl-decode-string (string)
 917   "Decode quoted-printable encoded STRING."
 918   (encode-coding-string
 919    string
 920    'mel-ccl-quoted-printable-lf-lf-rev))
 921
 922 (defun quoted-printable-ccl-decode-region (start end)
 923   "Decode the region from START to END with quoted-printable
 924 encoding."
 925   (interactive "*r")
 926   (encode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 927
 928 (defun quoted-printable-ccl-write-decoded-region (start end filename)
 929   "Decode quoted-printable encoded current region and write out to FILENAME."
 930   (interactive "*r\nFWrite decoded region to file: ")
 931   (let ((coding-system-for-write 'mel-ccl-quoted-printable-lf-lf-rev)
 932         jka-compr-compression-info-list jam-zcat-filename-list)
 933     (write-region start end filename)))
 934
 935 (mel-define-method-function
 936  (mime-decode-string string (nil "quoted-printable"))
 937  'quoted-printable-ccl-decode-string)
 938 (mel-define-method-function
 939  (mime-decode-region start end (nil "quoted-printable"))
 940  'quoted-printable-ccl-decode-region)
 941 (mel-define-method-function
 942  (mime-write-decoded-region start end filename (nil "quoted-printable"))
 943  'quoted-printable-ccl-write-decoded-region)
 944
 945
 946 ;;; @ Q
 947 ;;;
 948
 949 (defun q-encoding-ccl-encode-string (string &optional mode)
 950   "Encode STRING to Q-encoding of encoded-word, and return the result.
 951 MODE allows `text', `comment', `phrase' or nil.  Default value is
 952 `phrase'."
 953   (decode-coding-string
 954    string
 955    (cond
 956     ((eq mode 'text) 'mel-ccl-uq-rev)
 957     ((eq mode 'comment) 'mel-ccl-cq-rev)
 958     (t 'mel-ccl-pq-rev))))
 959
 960 (defun q-encoding-ccl-decode-string (string)
 961   "Decode Q encoded STRING and return the result."
 962   (encode-coding-string
 963    string
 964    'mel-ccl-uq-rev))
 965
 966 (unless (featurep 'xemacs)
 967   (defun q-encoding-ccl-encoded-length (string &optional mode)
 968     (let ((status [nil nil nil nil nil nil nil nil nil]))
 969       (fillarray status nil)            ; XXX: Is this necessary?
 970       (ccl-execute-on-string
 971        (cond
 972         ((eq mode 'text) 'mel-ccl-count-uq)
 973         ((eq mode 'comment) 'mel-ccl-count-cq)
 974         (t 'mel-ccl-count-pq))
 975        status
 976        string)
 977       (aref status 0)))
 978   )
 979
 980 (mel-define-method-function (encoded-text-encode-string string (nil "Q"))
 981                             'q-encoding-ccl-encode-string)
 982
 983 (mel-define-method encoded-text-decode-string (string (nil "Q"))
 984   (if (string-match (eval-when-compile
 985                       (concat "\\`" Q-encoded-text-regexp "\\'"))
 986                     string)
 987       (q-encoding-ccl-decode-string string)
 988     (error "Invalid encoded-text %s" string)))
 989
 990
 991 ;;; @ end
 992 ;;;
 993
 994 (provide 'mel-q-ccl)
 995
 996 ;;; mel-q-ccl.el ends here.