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)) (end)))
 477                      (` (((, column) += 1)
 478                          ((, after-wsp) = 1)
 479                          (write-repeat r1))))))
 480              (if ((, column) < 74)
 481                  ((r1 = (r0 + 0))
 482                   (,@ (mel-ccl-try-to-read-crlf
 483                        input-crlf 'r0
 484                        (` (((, column) = 0)
 485                            ((, after-wsp) = 0)
 486                            (write "=")
 487                            (write r1 (, mel-ccl-high-table))
 488                            (write r1 (, mel-ccl-low-table))
 489                            (write (, hard))
 490                            (, (mel-ccl-set-eof-block (` (end))))
 491                            (read r0)
 492                            (repeat)))
 493                        (` ((write "=")
 494                            (write r1 (, mel-ccl-high-table))
 495                            (write r1 (, mel-ccl-low-table)) (end)))
 496                        (` (((, column) += 1)
 497                            ((, after-wsp) = 1)
 498                            (write-repeat r1)))
 499                        (` ((write r1)
 500                            (write (, (concat soft "=0D")))
 501                            (end)))
 502                        (` (((, column) = 3)
 503                            ((, after-wsp) = 0)
 504                            (write r1)
 505                            (write-repeat (, (concat soft "=0D")))))
 506                        (` ((write "=")
 507                            (write r1 (, mel-ccl-high-table))
 508                            (write r1 (, mel-ccl-low-table))
 509                            (end)))
 510                        (` (((, column) += 1)
 511                            ((, after-wsp) = 1)
 512                            (write-repeat r1))))))
 513                (if ((, column) < 75)
 514                    (((, column) += 1)
 515                     ((, after-wsp) = 1)
 516                     (, (mel-ccl-set-eof-block (` ((write (, soft)) (end)))))
 517                     (write-read-repeat r0))
 518                  ((write (, soft))
 519                   ((, column) = 0)
 520                   ((, after-wsp) = 0)
 521                   (repeat)))))
 522            ;; r0:type-brk
 523            (, (if input-crlf
 524                   ;; r0{CR}:type-brk
 525                   (` ((if (((, column) > 73) & (, after-wsp))
 526                           (((, column) = 0)
 527                            ((, after-wsp) = 0)
 528                            (write (, soft))))
 529                       (, (mel-ccl-set-eof-block (` ((if ((, column) > 73) (write (, soft)))
 530                                                     (write "=0D") (end)))))
 531                       (read-if (r0 == ?\n)
 532                         (if (, after-wsp)
 533                             (((, after-wsp) = 0)
 534                              ((, column) = 0)
 535                              (write (, (concat soft hard)))
 536                              (, (mel-ccl-set-eof-block '(end)))
 537                              (read r0)
 538                              (repeat))
 539                           (((, after-wsp) = 0)
 540                            ((, column) = 0)
 541                            (write (, hard))
 542                            (, (mel-ccl-set-eof-block '(end)))
 543                            (read r0)
 544                            (repeat)))
 545                         (if ((, column) < 73)
 546                             (((, after-wsp) = 0)
 547                              ((, column) += 3)
 548                              (write-repeat "=0D"))
 549                           (if ((, column) < 74)
 550                               (if (r0 == ?\r)
 551                                   (((, after-wsp) = 0)
 552                                    (, (mel-ccl-set-eof-block
 553                                        (` ((write (, (concat soft "=0D=0D"))) (end)))))
 554                                    (read-if (r0 == ?\n)
 555                                      (((, column) = 0)
 556                                       (, (mel-ccl-set-eof-block
 557                                           (` ((write (, (concat "=0D" hard))) (end)))))
 558                                       (read r0)
 559                                       (write-repeat (, (concat "=0D" hard))))
 560                                      (((, column) = 6)
 561                                       (write-repeat (, (concat soft "=0D=0D"))))))
 562                                 (((, after-wsp) = 0)
 563                                  ((, column) = 3)
 564                                  (write-repeat (, (concat soft "=0D")))))
 565                             (((, after-wsp) = 0)
 566                              ((, column) = 3)
 567                              (write-repeat (, (concat soft "=0D")))))))))
 568                 ;; r0{LF}:type-brk
 569                 (` (if (, after-wsp)
 570                        ;; WSP ; r0{LF}:type-brk
 571                        (((, after-wsp) = 0)
 572                         ((, column) = 0)
 573                         (write (, (concat soft (if output-crlf "\r" ""))))
 574                         (, (mel-ccl-set-eof-block (` (end)))) (write-read-repeat r0))
 575                      ;; noWSP ; r0{LF}:type-brk
 576                      (((, after-wsp) = 0)
 577                       ((, column) = 0)
 578                       (,@ (if output-crlf '((write ?\r)) '()))
 579                       (, (mel-ccl-set-eof-block (` (end))))
 580                       (write-read-repeat r0))))
 581                 ))))))
 582        (branch
 583         (, eof-block-reg)
 584         (,@ (reverse (mapcar (quote car) eof-block-branches))))))))
 585
 586 (defun mel-ccl-decode-quoted-printable-generic (input-crlf output-crlf)
 587   (` (1
 588       ((read r0)
 589        (loop
 590         (branch
 591          r0
 592          (,@ (mapcar
 593               (lambda (r0)
 594                 (let ((tmp (aref mel-ccl-qp-table r0)))
 595                   (cond
 596                    ((eq tmp 'raw) (` (write-read-repeat r0)))
 597                    ((eq tmp 'wsp) (if (eq r0 (char-int ? ))
 598                                       (` (r1 = 1))
 599                                     (` (r1 = 0))))
 600                    ((eq tmp 'cr)
 601                     (if input-crlf
 602                         ;; r0='\r'
 603                         (` ((read r0)
 604                             ;; '\r' r0
 605                             (if (r0 == ?\n)
 606                                 ;; '\r' r0='\n'
 607                                 ;; hard line break found.
 608                                 (, (if output-crlf
 609                                        '((write ?\r)
 610                                          (write-read-repeat r0))
 611                                      '(write-read-repeat r0)))
 612                               ;; '\r' r0:[^\n]
 613                               ;; invalid control character (bare CR) found.
 614                               ;; -> ignore it and rescan from r0.
 615                               (repeat))))
 616                       ;; r0='\r'
 617                       ;; invalid character (bare CR) found.
 618                       ;; -> ignore.
 619                       (` ((read r0)
 620                           (repeat)))))
 621                    ((eq tmp 'lf)
 622                     (if input-crlf
 623                         ;; r0='\n'
 624                         ;; invalid character (bare LF) found.
 625                         ;; -> ignore.
 626                         (` ((read r0)
 627                             (repeat)))
 628                       ;; r0='\r\n'
 629                       ;; hard line break found.
 630                       (if output-crlf
 631                           '((write ?\r)
 632                             (write-read-repeat r0))
 633                         '(write-read-repeat r0))))
 634                    ((eq r0 (char-int ?=))
 635                     ;; r0='='
 636                     (` ((read r0)
 637                         ;; '=' r0
 638                         (r1 = (r0 == ?\t))
 639                         (if ((r0 == ? ) | r1)
 640                             ;; '=' r0:[\t ]
 641                             ;; Skip transport-padding.
 642                             ;; It should check CR LF after
 643                             ;; transport-padding.
 644                             (loop
 645                              (read-if (r0 == ?\t)
 646                                (repeat)
 647                                (if (r0 == ? )
 648                                    (repeat)
 649                                  (break)))))
 650                         ;; '=' [\t ]* r0:[^\t ]
 651                         (branch
 652                          r0
 653                          (,@ (mapcar
 654                               (lambda (r0)
 655                                 (cond
 656                                  ((eq r0 (char-int ?\r))
 657                                   (if input-crlf
 658                                       ;; '=' [\t ]* r0='\r'
 659                                       (` ((read r0)
 660                                           ;; '=' [\t ]* '\r' r0
 661                                           (if (r0 == ?\n)
 662                                               ;; '=' [\t ]* '\r' r0='\n'
 663                                               ;; soft line break found.
 664                                               ((read r0)
 665                                                (repeat))
 666                                             ;; '=' [\t ]* '\r' r0:[^\n]
 667                                             ;; invalid input ->
 668                                             ;; output "=" and rescan from r0.
 669                                             ((write "=")
 670                                              (repeat)))))
 671                                     ;; '=' [\t ]* r0='\r'
 672                                     ;; invalid input (bare CR found) ->
 673                                     ;; output "=" and rescan from next.
 674                                     (` ((write ?=)
 675                                         (read r0)
 676                                         (repeat)))))
 677                                  ((eq r0 (char-int ?\n))
 678                                   (if input-crlf
 679                                       ;; '=' [\t ]* r0='\n'
 680                                       ;; invalid input (bare LF found) ->
 681                                       ;; output "=" and rescan from next.
 682                                       (` ((write ?=)
 683                                           (read r0)
 684                                           (repeat)))
 685                                     ;; '=' [\t ]* r0='\r\n'
 686                                     ;; soft line break found.
 687                                     (` ((read r0)
 688                                         (repeat)))))
 689                                  ((setq tmp (nth r0 mel-ccl-256-to-16-table))
 690                                   ;; '=' [\t ]* r0:[0-9A-F]
 691                                   ;; upper nibble of hexadecimal digit found.
 692                                   (` ((r1 = (r0 + 0))
 693                                       (r0 = (, tmp)))))
 694                                  (t
 695                                   ;; '=' [\t ]* r0:[^\r0-9A-F]
 696                                   ;; invalid input ->
 697                                   ;; output "=" and rescan from r0.
 698                                   (` ((write ?=)
 699                                       (repeat))))))
 700                               mel-ccl-256-table)))
 701                         ;; '=' [\t ]* r1:r0:[0-9A-F]
 702                         (read-branch
 703                          r2
 704                          (,@ (mapcar
 705                               (lambda (r2)
 706                                 (if (setq tmp (nth r2 mel-ccl-256-to-16-table))
 707                                     ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[0-9A-F]
 708                                     (` (write-read-repeat
 709                                         r0
 710                                         (, (vconcat
 711                                             (mapcar
 712                                              (lambda (r0)
 713                                                (logior (lsh r0 4) tmp))
 714                                              mel-ccl-16-table)))))
 715                                   ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 716                                   ;; invalid input
 717                                   (` (r3 = 0))  ; nop
 718                                   ))
 719                               mel-ccl-256-table)))
 720                         ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 721                         ;; invalid input ->
 722                         ;; output "=" with hex digit and rescan from r2.
 723                         (write ?=)
 724                         (r0 = (r2 + 0))
 725                         (write-repeat r1))))
 726                     (t
 727                      ;; r0:[^\t\r -~]
 728                      ;; invalid character found.
 729                      ;; -> ignore.
 730                      (` ((read r0)
 731                          (repeat)))))))
 732               mel-ccl-256-table)))
 733       ;; r1[0]:[\t ]
 734       (loop
 735        (,@ (apply
 736             'append
 737             (mapcar
 738              (lambda (regnum)
 739                (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 740                  (apply
 741                   'append
 742                   (mapcar
 743                    (lambda (bit)
 744                      (if (= bit 0)
 745                          (if (= regnum 0)
 746                              nil
 747                            (` ((read r0)
 748                                (if (r0 == ?\t)
 749                                    ((, reg) = 0)
 750                                  (if (r0 == ?\ )
 751                                      ((, reg) = 1)
 752                                    ((r6 = (, (+ (* regnum 28) bit)))
 753                                     (break)))))))
 754                        (` ((read r0)
 755                            (if (r0 == ?\ )
 756                                ((, reg) |= (, (lsh 1 bit)))
 757                              (if (r0 != ?\t)
 758                                  ((r6 = (, (+ (* regnum 28) bit)))
 759                                   (break))))))))
 760                    mel-ccl-28-table))))
 761              '(0 1 2 3 4))))
 762        ;; white space buffer exhaust.
 763        ;; error: line length limit (76bytes) violation.
 764        ;; -> ignore these white spaces.
 765        (repeat))
 766       (, (if input-crlf
 767              (` (if (r0 == ?\r)
 768                     ((read r0)
 769                      (if (r0 == ?\n)
 770                          ;; trailing white spaces found.
 771                          ;; -> ignore these white spacs.
 772                          ((write (, (if output-crlf "\r\n" "\n")))
 773                           (read r0)
 774                           (repeat))
 775                        ;; [\t ]* \r r0:[^\n]
 776                         ;; error: bare CR found.
 777                         ;; -> output white spaces and ignore bare CR.
 778                         ))
 779                   ;; [\t ]* r0:[^\r]
 780                   ;; middle white spaces found.
 781                   ))
 782            (` (if (r0 == ?\n)
 783                   ;; trailing white spaces found.
 784                   ;; -> ignore these white spacs.
 785                   ((write (, (if output-crlf "\r\n" "\n")))
 786                    (read r0)
 787                    (repeat))
 788                 ;; [\t ]* r0:[^\n]
 789                 ;; middle white spaces found.
 790                 ))))
 791       (,@ (apply
 792            'append
 793            (mapcar
 794             (lambda (regnum)
 795               (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 796                 (apply
 797                  'append
 798                  (mapcar
 799                   (lambda (bit)
 800                     (` ((if ((, reg) & (, (lsh 1 bit)))
 801                             (write ?\ )
 802                           (write ?\t))
 803                         (if (r6 == (, (+ (* regnum 28) bit 1)))
 804                             (repeat)))))
 805                   mel-ccl-28-table))))
 806             '(0 1 2 3 4))))
 807       (repeat)
 808       )))))
 809
 810 )
 811
 812 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-crlf
 813   (mel-ccl-encode-quoted-printable-generic t t))
 814
 815 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-lf
 816   (mel-ccl-encode-quoted-printable-generic t nil))
 817
 818 (define-ccl-program mel-ccl-encode-quoted-printable-lf-crlf
 819   (mel-ccl-encode-quoted-printable-generic nil t))
 820
 821 (define-ccl-program mel-ccl-encode-quoted-printable-lf-lf
 822   (mel-ccl-encode-quoted-printable-generic nil nil))
 823
 824 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-crlf
 825   (mel-ccl-decode-quoted-printable-generic t t))
 826
 827 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-lf
 828   (mel-ccl-decode-quoted-printable-generic t nil))
 829
 830 (define-ccl-program mel-ccl-decode-quoted-printable-lf-crlf
 831   (mel-ccl-decode-quoted-printable-generic nil t))
 832
 833 (define-ccl-program mel-ccl-decode-quoted-printable-lf-lf
 834   (mel-ccl-decode-quoted-printable-generic nil nil))
 835
 836
 837 ;;; @ coding system
 838 ;;;
 839
 840 (make-ccl-coding-system
 841  'mel-ccl-uq-rev ?Q "MIME Q-encoding in unstructured field (reversed)"
 842  'mel-ccl-encode-uq 'mel-ccl-decode-q)
 843
 844 (make-ccl-coding-system
 845  'mel-ccl-cq-rev ?Q "MIME Q-encoding in comment (reversed)"
 846  'mel-ccl-encode-cq 'mel-ccl-decode-q)
 847
 848 (make-ccl-coding-system
 849  'mel-ccl-pq-rev ?Q "MIME Q-encoding in phrase (reversed)"
 850  'mel-ccl-encode-pq 'mel-ccl-decode-q)
 851
 852 (make-ccl-coding-system
 853  'mel-ccl-quoted-printable-crlf-crlf-rev
 854  ?Q "MIME Quoted-Printable-encoding (reversed)"
 855  'mel-ccl-encode-quoted-printable-crlf-crlf
 856  'mel-ccl-decode-quoted-printable-crlf-crlf)
 857
 858 (make-ccl-coding-system
 859  'mel-ccl-quoted-printable-lf-crlf-rev
 860  ?Q "MIME Quoted-Printable-encoding (LF encoding) (reversed)"
 861  'mel-ccl-encode-quoted-printable-crlf-lf
 862  'mel-ccl-decode-quoted-printable-lf-crlf)
 863
 864 (make-ccl-coding-system
 865  'mel-ccl-quoted-printable-crlf-lf-rev
 866  ?Q "MIME Quoted-Printable-encoding (LF internal) (reversed)"
 867  'mel-ccl-encode-quoted-printable-lf-crlf
 868  'mel-ccl-decode-quoted-printable-crlf-lf)
 869
 870 (make-ccl-coding-system
 871  'mel-ccl-quoted-printable-lf-lf-rev
 872  ?Q "MIME Quoted-Printable-encoding (LF encoding) (LF internal) (reversed)"
 873  'mel-ccl-encode-quoted-printable-lf-lf
 874  'mel-ccl-decode-quoted-printable-lf-lf)
 875
 876
 877 ;;; @ quoted-printable
 878 ;;;
 879
 880 (check-broken-facility ccl-execute-eof-block-on-decoding-some)
 881
 882 (unless-broken ccl-execute-eof-block-on-decoding-some
 883
 884   (defun quoted-printable-ccl-encode-string (string)
 885     "Encode STRING with quoted-printable encoding."
 886     (decode-coding-string
 887      string
 888      'mel-ccl-quoted-printable-lf-lf-rev))
 889
 890   (defun quoted-printable-ccl-encode-region (start end)
 891     "Encode the region from START to END with quoted-printable encoding."
 892     (interactive "*r")
 893     (decode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 894
 895   (defun quoted-printable-ccl-insert-encoded-file (filename)
 896     "Encode contents of the file named as FILENAME, and insert it."
 897     (interactive "*fInsert encoded file: ")
 898     (insert-file-contents-as-coding-system
 899      'mel-ccl-quoted-printable-lf-lf-rev filename))
 900
 901   (mel-define-method-function
 902    (mime-encode-string string (nil "quoted-printable"))
 903    'quoted-printable-ccl-encode-string)
 904   (mel-define-method-function
 905    (mime-encode-region start end (nil "quoted-printable"))
 906    'quoted-printable-ccl-encode-region)
 907   (mel-define-method-function
 908    (mime-insert-encoded-file filename (nil "quoted-printable"))
 909    'quoted-printable-ccl-insert-encoded-file)
 910   )
 911
 912 (defun quoted-printable-ccl-decode-string (string)
 913   "Decode quoted-printable encoded STRING."
 914   (encode-coding-string
 915    string
 916    'mel-ccl-quoted-printable-lf-lf-rev))
 917
 918 (defun quoted-printable-ccl-decode-region (start end)
 919   "Decode the region from START to END with quoted-printable
 920 encoding."
 921   (interactive "*r")
 922   (encode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 923
 924 (defun quoted-printable-ccl-write-decoded-region (start end filename)
 925   "Decode quoted-printable encoded current region and write out to FILENAME."
 926   (interactive "*r\nFWrite decoded region to file: ")
 927   (write-region-as-coding-system 'mel-ccl-quoted-printable-lf-lf-rev
 928                                  start end filename))
 929
 930 (mel-define-method-function
 931  (mime-decode-string string (nil "quoted-printable"))
 932  'quoted-printable-ccl-decode-string)
 933 (mel-define-method-function
 934  (mime-decode-region start end (nil "quoted-printable"))
 935  'quoted-printable-ccl-decode-region)
 936 (mel-define-method-function
 937  (mime-write-decoded-region start end filename (nil "quoted-printable"))
 938  'quoted-printable-ccl-write-decoded-region)
 939
 940
 941 ;;; @ Q
 942 ;;;
 943
 944 (defun q-encoding-ccl-encode-string (string &optional mode)
 945   "Encode STRING to Q-encoding of encoded-word, and return the result.
 946 MODE allows `text', `comment', `phrase' or nil.  Default value is
 947 `phrase'."
 948   (decode-coding-string
 949    string
 950    (cond
 951     ((eq mode 'text) 'mel-ccl-uq-rev)
 952     ((eq mode 'comment) 'mel-ccl-cq-rev)
 953     (t 'mel-ccl-pq-rev))))
 954
 955 (defun q-encoding-ccl-decode-string (string)
 956   "Decode Q encoded STRING and return the result."
 957   (encode-coding-string
 958    string
 959    'mel-ccl-uq-rev))
 960
 961 (unless (featurep 'xemacs)
 962   (defun q-encoding-ccl-encoded-length (string &optional mode)
 963     (let ((status [nil nil nil nil nil nil nil nil nil]))
 964       (fillarray status nil)            ; XXX: Is this necessary?
 965       (ccl-execute-on-string
 966        (cond
 967         ((eq mode 'text) 'mel-ccl-count-uq)
 968         ((eq mode 'comment) 'mel-ccl-count-cq)
 969         (t 'mel-ccl-count-pq))
 970        status
 971        string)
 972       (aref status 0)))
 973   )
 974
 975 (mel-define-method-function (encoded-text-encode-string string (nil "Q"))
 976                             'q-encoding-ccl-encode-string)
 977
 978 (mel-define-method encoded-text-decode-string (string (nil "Q"))
 979   (if (string-match (eval-when-compile
 980                       (concat "\\`" Q-encoded-text-regexp "\\'"))
 981                     string)
 982       (q-encoding-ccl-decode-string string)
 983     (error "Invalid encoded-text %s" string)))
 984
 985
 986 ;;; @ end
 987 ;;;
 988
 989 (provide 'mel-q-ccl)
 990
 991 ;;; mel-q-ccl.el ends here.