mel-q-ccl.el

   1 ;;; mel-ccl.el: CCL based encoder/decoder of Quoted-Printable
   2 ;;;             and Q-encoding
   3
   4 ;; Copyright (C) 1998 Tanaka Akira
   5
   6 ;; Author: Tanaka Akira <akr@jaist.ac.jp>
   7 ;; Created: 1998/9/17
   8 ;; Keywords: MIME, Quoted-Printable, Q-encoding
   9
  10 ;; This file is part of FLIM (Faithful Library about Internet Message).
  11
  12 ;; This program is free software; you can redistribute it and/or
  13 ;; modify it under the terms of the GNU General Public License as
  14 ;; published by the Free Software Foundation; either version 2, or (at
  15 ;; your option) any later version.
  16
  17 ;; This program is distributed in the hope that it will be useful, but
  18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ;; General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Code:
  28
  29 (require 'ccl)
  30 (require 'pccl)
  31 (require 'mime-def)
  32
  33
  34 ;;; @ constants
  35 ;;;
  36
  37 (eval-when-compile
  38
  39 (defconst mel-ccl-16-table
  40   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15))
  41
  42 (defconst mel-ccl-28-table
  43   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
  44      16  17  18  19  20  21  22  23  24  25  26  27))
  45
  46 (defconst mel-ccl-256-table
  47   '(  0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
  48      16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31
  49      32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47
  50      48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63
  51      64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79
  52      80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95
  53      96  97  98  99 100 101 102 103 104 105 106 107 108 109 110 111
  54     112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
  55     128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
  56     144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
  57     160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
  58     176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
  59     192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
  60     208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
  61     224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
  62     240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255))
  63
  64 (defconst mel-ccl-256-to-16-table
  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     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
  68       0   1   2   3   4   5   6   7   8   9 nil nil nil nil nil nil
  69     nil  10  11  12  13  14  15 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     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil))
  81
  82 (defconst mel-ccl-16-to-256-table
  83   (mapcar 'char-int "0123456789ABCDEF"))
  84
  85 (defconst mel-ccl-high-table
  86   (vconcat
  87    (mapcar
  88     (lambda (v) (nth (lsh v -4) mel-ccl-16-to-256-table))
  89     mel-ccl-256-table)))
  90
  91 (defconst mel-ccl-low-table
  92   (vconcat
  93    (mapcar
  94     (lambda (v) (nth (logand v 15) mel-ccl-16-to-256-table))
  95     mel-ccl-256-table)))
  96
  97 (defconst mel-ccl-u-raw
  98   (mapcar
  99    'char-int
 100    "0123456789\
 101 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 102 abcdefghijklmnopqrstuvwxyz\
 103 !@#$%&'()*+,-./:;<>@[\\]^`{|}~"))
 104
 105 (defconst mel-ccl-c-raw
 106   (mapcar
 107    'char-int
 108    "0123456789\
 109 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 110 abcdefghijklmnopqrstuvwxyz\
 111 !@#$%&'*+,-./:;<>@[]^`{|}~"))
 112
 113 (defconst mel-ccl-p-raw
 114   (mapcar
 115    'char-int
 116    "0123456789\
 117 ABCDEFGHIJKLMNOPQRSTUVWXYZ\
 118 abcdefghijklmnopqrstuvwxyz\
 119 !*+-/"))
 120
 121 (defconst mel-ccl-qp-table
 122   [enc enc enc enc enc enc enc enc enc wsp lf  enc enc cr  enc enc
 123    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc
 124    wsp raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw
 125    raw raw raw raw raw raw raw raw raw raw raw raw raw enc 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 raw
 129    raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw 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    enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc enc])
 138
 139 )
 140
 141
 142 ;;; @ CCL programs
 143 ;;;
 144
 145 ;;; Q
 146
 147 (define-ccl-program mel-ccl-decode-q
 148   `(1
 149     ((loop
 150       (read-branch
 151        r0
 152        ,@(mapcar
 153           (lambda (r0)
 154             (cond
 155              ((= r0 (char-int ?_))
 156               `(write-repeat ? ))
 157              ((= r0 (char-int ?=))
 158               `((loop
 159                  (read-branch
 160                   r1
 161                   ,@(mapcar
 162                      (lambda (v)
 163                        (if (integerp v)
 164                            `((r0 = ,v) (break))
 165                          '(repeat)))
 166                      mel-ccl-256-to-16-table)))
 167                 (loop
 168                  (read-branch
 169                   r1
 170                   ,@(mapcar
 171                      (lambda (v)
 172                        (if (integerp v)
 173                            `((write r0 ,(vconcat
 174                                          (mapcar
 175                                           (lambda (r0)
 176                                             (logior (lsh r0 4) v))
 177                                           mel-ccl-16-table)))
 178                              (break))
 179                          '(repeat)))
 180                      mel-ccl-256-to-16-table)))
 181                 (repeat)))
 182              (t
 183               `(write-repeat ,r0))))
 184           mel-ccl-256-table))))))
 185
 186 (eval-when-compile
 187
 188 (defun mel-ccl-encode-q-generic (raw)
 189   `(3
 190     (loop
 191      (loop
 192       (read-branch
 193        r0
 194        ,@(mapcar
 195           (lambda (r0)
 196             (cond
 197              ((= r0 32) `(write-repeat ?_))
 198              ((member r0 raw) `(write-repeat ,r0))
 199              (t '(break))))
 200           mel-ccl-256-table)))
 201      (write ?=)
 202      (write r0 ,mel-ccl-high-table)
 203      (write r0 ,mel-ccl-low-table)
 204      (repeat))))
 205
 206 ;; On xemacs, generated program counts iso-8859-1 8bit character as 6bytes.
 207 (defun mel-ccl-count-q-length (raw)
 208   `(0
 209     ((r0 = 0)
 210      (loop
 211       (read-branch
 212        r1
 213        ,@(mapcar
 214           (lambda (r1)
 215             (if (or (= r1 32) (member r1 raw))
 216                 '((r0 += 1) (repeat))
 217               '((r0 += 3) (repeat))))
 218           mel-ccl-256-table))))))
 219
 220 )
 221
 222 (define-ccl-program mel-ccl-encode-uq
 223   (mel-ccl-encode-q-generic mel-ccl-u-raw))
 224 (define-ccl-program mel-ccl-encode-cq
 225   (mel-ccl-encode-q-generic mel-ccl-c-raw))
 226 (define-ccl-program mel-ccl-encode-pq
 227   (mel-ccl-encode-q-generic mel-ccl-p-raw))
 228
 229 (define-ccl-program mel-ccl-count-uq
 230   (mel-ccl-count-q-length mel-ccl-u-raw))
 231 (define-ccl-program mel-ccl-count-cq
 232   (mel-ccl-count-q-length mel-ccl-c-raw))
 233 (define-ccl-program mel-ccl-count-pq
 234   (mel-ccl-count-q-length mel-ccl-p-raw))
 235
 236 ;; Quoted-Printable
 237
 238 (eval-when-compile
 239
 240 (defun mel-ccl-try-to-read-crlf (input-crlf reg eof-reg cr-eof lf-eof crlf-eof succ fail-cr fail-lf fail-crlf)
 241   (if input-crlf
 242       `((,eof-reg = ,cr-eof) (read-if (,reg == ?\r)
 243         ((,eof-reg = ,lf-eof) (read-if (,reg == ?\n)
 244          ,succ
 245          ,fail-lf))
 246         ,fail-cr))
 247     `((,eof-reg = ,crlf-eof) (read-if (,reg == ?\n)
 248       ,succ
 249       ,fail-crlf))))
 250
 251 )
 252
 253 (eval-when-compile
 254
 255 ;; Generated CCL program works not properly on 20.2 because CCL_EOF_BLOCK
 256 ;; is not executed.
 257 (defun mel-ccl-encode-quoted-printable-generic (input-crlf output-crlf)
 258   `(4
 259     ((r6 = 0)                           ; column
 260      (r5 = 0)                           ; previous character is white space
 261      (r4 = 0)
 262      (read r0)
 263      (loop                              ; r6 <= 75
 264       (loop
 265        (loop
 266         (branch
 267          r0
 268          ,@(mapcar
 269             (lambda (r0)
 270               (let ((tmp (aref mel-ccl-qp-table r0)))
 271                 (cond
 272                  ((eq r0 (char-int ?F))
 273                   `(if (r6 == 0)
 274                        ((r4 = 15) (read-if (r0 == ?r)
 275                         ((r4 = 16) (read-if (r0 == ?o)
 276                          ((r4 = 17) (read-if (r0 == ?m)
 277                           ((r4 = 18) (read-if (r0 == ? )
 278                            ((r6 = 7)
 279                             (r5 = 1)
 280                             (write "=46rom ")
 281                             (r4 = 19)
 282                             (read r0)
 283                             (repeat))
 284                            ((r6 = 4)
 285                             (write-repeat "From"))))
 286                           ((r6 = 3)
 287                            (write-repeat "Fro"))))
 288                          ((r6 = 2)
 289                           (write-repeat "Fr"))))
 290                         ((r6 = 1)
 291                          (write-repeat "F"))))
 292                      ((r3 = 0) (break)) ; RAW
 293                      ))
 294                  ((eq r0 (char-int ?.))
 295                   `(if (r6 == 0)
 296                        ,(mel-ccl-try-to-read-crlf
 297                          input-crlf
 298                          'r0 'r4 20 21 22
 299                          `((write ,(if output-crlf "=2E\r\n" "=2E\n"))
 300                            (r4 = 23)
 301                            (read r0)
 302                            (repeat))
 303                          '((r6 = 1)
 304                            (write-repeat "."))
 305                          '((r6 = 4)
 306                            (write-repeat ".=0D"))
 307                          '((r6 = 1)
 308                            (write-repeat ".")))
 309                      ((r3 = 0) (break)) ; RAW
 310                      ))
 311                  ((eq tmp 'raw) '((r3 = 0) (break))) ; RAW
 312                  ((eq tmp 'enc) '((r3 = 1) (break))) ; ENC
 313                  ((eq tmp 'wsp) '((r3 = 2) (break))) ; WSP
 314                  ((eq tmp 'cr) (if input-crlf
 315                                    '((r3 = 3) (break)) ; CR
 316                                  '((r3 = 1) (break)))) ; ENC
 317                  ((eq tmp 'lf) (if input-crlf
 318                                    '((r3 = 1) (break)) ; ENC
 319                                  '((r3 = 3) (break)))) ; CRLF
 320                  )))
 321             mel-ccl-256-table)))
 322        (branch
 323         r3
 324         ;; r0:r3=RAW
 325         (if (r6 < 75)
 326             ((r6 += 1)
 327              (r5 = 0)
 328              (r4 = 1)
 329              (write-read-repeat r0))
 330           (break))
 331         ;; r0:r3=ENC
 332         ((r5 = 0)
 333          (if (r6 < 73)
 334              ((r6 += 3)
 335               (write "=")
 336               (write r0 ,mel-ccl-high-table)
 337               (r4 = 2)
 338               (write-read-repeat r0 ,mel-ccl-low-table))
 339            (if (r6 > 73)
 340                ((r6 = 3)
 341                 (write ,(if output-crlf "=\r\n=" "=\n="))
 342                 (write r0 ,mel-ccl-high-table)
 343                 (r4 = 3)
 344                 (write-read-repeat r0 ,mel-ccl-low-table))
 345              (break))))
 346         ;; r0:r3=WSP
 347         ((r5 = 1)
 348          (if (r6 < 75)
 349              ((r6 += 1)
 350               (r4 = 4)
 351               (write-read-repeat r0))
 352            ((r6 = 1)
 353             (write ,(if output-crlf "=\r\n" "=\n"))
 354             (r4 = 5)
 355             (write-read-repeat r0))))
 356         ;; r0:r3=CR/CRLF
 357         ,(if input-crlf
 358              ;; r0:r3=CR
 359              `((if ((r6 > 73) & r5)
 360                    ((r6 = 0)
 361                     (r5 = 0)
 362                     (write ,(if output-crlf "=\r\n" "=\n"))))
 363                (break))
 364            ;; r0:r3=CRLF
 365            `(if r5
 366                 ;; WSP ; r0:r3=CRLF
 367                 ((r5 = 0)
 368                  (r6 = 0)
 369                  (write ,(if output-crlf "=\r\n" "=\n"))
 370                  ,@(if output-crlf '((write ?\r)) '())
 371                  (r4 = 0)
 372                  (write-read-repeat r0))
 373               ;; noWSP ; r0:r3=CRLF
 374               ((r5 = 0)
 375                (r6 = 0)
 376                ,@(if output-crlf '((write ?\r)) '())
 377                (r4 = 0)
 378                (write-read-repeat r0)))
 379            )))
 380       ;; r0:r3={RAW,ENC,CR}
 381       (loop
 382        ,(funcall
 383          (lambda (after-cr after-raw-enc)
 384            (if input-crlf
 385                `(if (r0 == ?\r)
 386                     ,after-cr
 387                   ,after-raw-enc)
 388              after-raw-enc))
 389          ;; r0=\r:r3=CR
 390          `((r4 = 6)
 391            (read r0)
 392            ;; CR:r3=CR r0
 393            (if (r0 == ?\n)
 394                ;; CR:r3=CR r0=LF
 395                (if r5
 396                    ;; r5=WSP ; CR:r3=CR r0=LF
 397                    ((r6 = 0)
 398                     (r5 = 0)
 399                     (write ,(if output-crlf "=\r\n\r\n" "=\n\n"))
 400                     (r4 = 7)
 401                     (read r0)
 402                     (break))
 403                  ;; r5=noWSP ; CR:r3=CR r0=LF
 404                  ((r6 = 0)
 405                   (r5 = 0)
 406                   (write ,(if output-crlf "\r\n" "\n"))
 407                   (r4 = 8)
 408                   (read r0)
 409                   (break)))
 410              ;; CR:r3=CR r0=noLF
 411              (if (r6 < 73)
 412                  ((r6 += 3)
 413                   (r5 = 0)
 414                   (write "=0D")
 415                   (break))
 416                (if (r6 == 73)
 417                    (if (r0 == ?\r)
 418                        ;; CR:r3=CR r0=CR
 419                        ((r4 = 9)
 420                         (read r0)
 421                         ;; CR:r3=CR CR r0
 422                         (if (r0 == ?\n)
 423                             ;; CR:r3=CR CR LF
 424                             ((r6 = 0)
 425                              (r5 = 0)
 426                              (write ,(if output-crlf "=0D\r\n" "=0D\n"))
 427                              (r4 = 10)
 428                              (read r0)
 429                              (break))
 430                           ;; CR:r3=CR CR noLF
 431                           ((r6 = 6)
 432                            (r5 = 0)
 433                            (write ,(if output-crlf "=\r\n=0D=0D" "=\n=0D=0D"))
 434                            (break))))
 435                      ;; CR:r3=CR r0=noLFnorCR
 436                      ((r6 = 3)
 437                       (r5 = 0)
 438                       (write ,(if output-crlf "=\r\n=0D" "=\n=0D"))
 439                       (break)))
 440                  ((r6 = 3)
 441                   (r5 = 0)
 442                   (write ,(if output-crlf "=\r\n=0D" "=\n=0D"))
 443                   (break))))))
 444          (funcall
 445           (lambda (after-newline after-cr-nolf after-nonewline)
 446             (if input-crlf
 447                 ;; r0:r3={RAW,ENC}
 448                 `((r4 = 11)
 449                   (read r1)
 450                   ;; r0:r3={RAW,ENC} r1
 451                   (if (r1 == ?\r)
 452                       ;; r0:r3={RAW,ENC} r1=CR
 453                       ((r4 = 12)
 454                        (read r1)
 455                        ;; r0:r3={RAW,ENC} CR r1
 456                        (if (r1 == ?\n)
 457                            ;; r0:r3=RAW CR r1=LF
 458                            ,after-newline
 459                          ;; r0:r3=RAW CR r1=noLF
 460                          ,after-cr-nolf))
 461                     ;; r0:r3={RAW,ENC} r1:noCR
 462                     ,after-nonewline))
 463               ;; r0:r3={RAW,ENC}
 464               `((r4 = 11)
 465                 (read r1)
 466                 ;; r0:r3={RAW,ENC} r1
 467                 (if (r1 == ?\n)
 468                     ;; r0:r3={RAW,ENC} r1=CRLF
 469                     ,after-newline
 470                   ;; r0:r3={RAW,ENC} r1:noCRLF
 471                   ,after-nonewline))))
 472           ;; r0:r3={RAW,ENC} CR r1=LF
 473           ;; r0:r3={RAW,ENC} r1=CRLF
 474           `((r6 = 0)
 475             (r5 = 0)
 476             (branch
 477              r3
 478              ;; r0:r3=RAW CR r1=LF
 479              ;; r0:r3=RAW r1=CRLF
 480              ((write r0)
 481               (write ,(if output-crlf "\r\n" "\n"))
 482               (r4 = 13)
 483               (read r0)
 484               (break))
 485              ;; r0:r3=ENC CR r1=LF
 486              ;; r0:r3=ENC r1=CRLF
 487              ((write ?=)
 488               (write r0 ,mel-ccl-high-table)
 489               (write r0 ,mel-ccl-low-table)
 490               (write ,(if output-crlf "\r\n" "\n"))
 491               (r4 = 14)
 492               (read r0)
 493               (break))))
 494           ;; r0:r3={RAW,ENC} CR r1=noLF
 495           `((branch
 496              r3
 497              ;; r0:r3=RAW CR r1:noLF
 498              ((r6 = 4)
 499               (r5 = 0)
 500               (write ,(if output-crlf "=\r\n" "=\n"))
 501               (write r0)
 502               (write "=0D")
 503               (r0 = (r1 + 0)) ; "+ 0" is workaround for mule 2.3@19.34.
 504               (break))
 505              ;; r0:r3=ENC CR r1:noLF
 506              ((r6 = 6)
 507               (r5 = 0)
 508               (write ,(if output-crlf "=\r\n=" "=\n="))
 509               (write r0 ,mel-ccl-high-table)
 510               (write r0 ,mel-ccl-low-table)
 511               (write "=0D")
 512               (r0 = (r1 + 0))
 513               (break))))
 514           ;; r0:r3={RAW,ENC} r1:noCR
 515           ;; r0:r3={RAW,ENC} r1:noCRLF
 516           `((branch
 517              r3
 518              ;; r0:r3=RAW r1:noCR
 519              ;; r0:r3=RAW r1:noCRLF
 520              ((r6 = 1)
 521               (r5 = 0)
 522               (write ,(if output-crlf "=\r\n" "=\n"))
 523               (write r0)
 524               (r0 = (r1 + 0))
 525               (break))
 526              ;; r0:r3=ENC r1:noCR
 527              ;; r0:r3=ENC r1:noCRLF
 528              ((r6 = 3)
 529               (r5 = 0)
 530               (write ,(if output-crlf "=\r\n=" "=\n="))
 531               (write r0 ,mel-ccl-high-table)
 532               (write r0 ,mel-ccl-low-table)
 533               (r0 = (r1 + 0))
 534               (break)))))))
 535       (repeat)))
 536     ;; EOF
 537     (                                   ;(write "[EOF:") (write r4 ,mel-ccl-high-table) (write r4 ,mel-ccl-low-table) (write "]")
 538      (branch
 539       r4
 540       ;; 0: (start) ;
 541       (end)
 542       ;; 1: RAW ;
 543       (end)
 544       ;; 2: r0:r3=ENC ;
 545       (end)
 546       ;; 3: SOFTBREAK r0:r3=ENC ;
 547       (end)
 548       ;; 4: r0:r3=WSP ;
 549       ((write ,(if output-crlf "=\r\n" "=\n")) (end))
 550       ;; 5: SOFTBREAK r0:r3=WSP ;
 551       ((write ,(if output-crlf "=\r\n" "=\n")) (end))
 552       ;; 6: ; r0=\r:r3=CR
 553       (if (r6 <= 73)
 554           ((write "=0D") (end))
 555         ((write ,(if output-crlf "=\r\n=0D" "=\n=0D")) (end)))
 556       ;; 7: r5=WSP SOFTBREAK CR:r3=CR r0=LF ;
 557       (end)
 558       ;; 8: r5=noWSP CR:r3=CR r0=LF ;
 559       (end)
 560       ;; 9: (r6=73) ; CR:r3=CR r0=CR
 561       ((write ,(if output-crlf "=\r\n=0D=0D" "=\n=0D=0D")) (end))
 562       ;; 10: (r6=73) CR:r3=CR CR LF ;
 563       (end)
 564       ;; 11: ; r0:r3={RAW,ENC}
 565       (branch
 566        r3
 567        ((write r0) (end))
 568        ((write "=")
 569         (write r0 ,mel-ccl-high-table)
 570         (write r0 ,mel-ccl-low-table)
 571         (end)))
 572       ;; 12: ; r0:r3={RAW,ENC} r1=CR
 573       (branch
 574        r3
 575        ;; ; r0:r3=RAW r1=CR
 576        ((write ,(if output-crlf "=\r\n" "=\n"))
 577         (write r0)
 578         (write "=0D")
 579         (end))
 580        ;; ; r0:r3=ENC r1=CR
 581        ((write ,(if output-crlf "=\r\n=" "=\n="))
 582         (write r0 ,mel-ccl-high-table)
 583         (write r0 ,mel-ccl-low-table)
 584         (write "=0D")
 585         (end)))
 586       ;; 13: r0:r3=RAW CR LF ;
 587       ;; 13: r0:r3=RAW CRLF ;
 588       (end)
 589       ;; 14: r0:r3=ENC CR LF ;
 590       ;; 14: r0:r3=ENC CRLF ;
 591       (end)
 592       ;; 15: r6=0 ; "F"
 593       ((write "F") (end))
 594       ;; 16: r6=0 ; "Fr"
 595       ((write "Fr") (end))
 596       ;; 17: r6=0 ; "Fro"
 597       ((write "Fro") (end))
 598       ;; 18: r6=0 ; "From"
 599       ((write "From") (end))
 600       ;; 19: r6=0 "From " ;
 601       (end)
 602       ;; 20: r6=0 ; "."
 603       ((write ".") (end))
 604       ;; 21: r6=0 ; ".\r"
 605       ((write ".=0D") (end))
 606       ;; 22: r6=0 ; "."
 607       ((write ".") (end))
 608       ;; 23: r6=0 ".\r\n" ;
 609       (end)
 610       ))
 611     ))
 612
 613 (defun mel-ccl-decode-quoted-printable-generic (input-crlf output-crlf)
 614   `(1
 615     ((read r0)
 616      (loop
 617       (branch
 618        r0
 619        ,@(mapcar
 620           (lambda (r0)
 621             (let ((tmp (aref mel-ccl-qp-table r0)))
 622               (cond
 623                ((eq tmp 'raw) `(write-read-repeat r0))
 624                ((eq tmp 'wsp) (if (eq r0 (char-int ? ))
 625                                   `(r1 = 1)
 626                                 `(r1 = 0)))
 627                ((eq tmp 'cr)
 628                 (if input-crlf
 629                     ;; r0='\r'
 630                     `((read r0)
 631                       ;; '\r' r0
 632                       (if (r0 == ?\n)
 633                           ;; '\r' r0='\n'
 634                           ;; hard line break found.
 635                           ,(if output-crlf
 636                                '((write ?\r)
 637                                  (write-read-repeat r0))
 638                              '(write-read-repeat r0))
 639                         ;; '\r' r0:[^\n]
 640                         ;; invalid control character (bare CR) found.
 641                         ;; -> ignore it and rescan from r0.
 642                         (repeat)))
 643                   ;; r0='\r'
 644                   ;; invalid character (bare CR) found.
 645                   ;; -> ignore.
 646                   `((read r0)
 647                     (repeat))))
 648                ((eq tmp 'lf)
 649                 (if input-crlf
 650                     ;; r0='\n'
 651                     ;; invalid character (bare LF) found.
 652                     ;; -> ignore.
 653                     `((read r0)
 654                       (repeat))
 655                   ;; r0='\r\n'
 656                   ;; hard line break found.
 657                   (if output-crlf
 658                       '((write ?\r)
 659                         (write-read-repeat r0))
 660                     '(write-read-repeat r0))))
 661                ((eq r0 (char-int ?=))
 662                 ;; r0='='
 663                 `((read r0)
 664                   ;; '=' r0
 665                   (r1 = (r0 == ?\t))
 666                   (if ((r0 == ? ) | r1)
 667                       ;; '=' r0:[\t ]
 668                       ;; Skip transport-padding.
 669                       ;; It should check CR LF after
 670                       ;; transport-padding.
 671                       (loop
 672                        (read-if (r0 == ?\t)
 673                                 (repeat)
 674                                 (if (r0 == ? )
 675                                     (repeat)
 676                                   (break)))))
 677                   ;; '=' [\t ]* r0:[^\t ]
 678                   (branch
 679                    r0
 680                    ,@(mapcar
 681                       (lambda (r0)
 682                         (cond
 683                          ((eq r0 (char-int ?\r))
 684                           (if input-crlf
 685                               ;; '=' [\t ]* r0='\r'
 686                               `((read r0)
 687                                 ;; '=' [\t ]* '\r' r0
 688                                 (if (r0 == ?\n)
 689                                     ;; '=' [\t ]* '\r' r0='\n'
 690                                     ;; soft line break found.
 691                                     ((read r0)
 692                                      (repeat))
 693                                   ;; '=' [\t ]* '\r' r0:[^\n]
 694                                   ;; invalid input ->
 695                                   ;; output "=" and rescan from r0.
 696                                   ((write "=")
 697                                    (repeat))))
 698                             ;; '=' [\t ]* r0='\r'
 699                             ;; invalid input (bare CR found) ->
 700                             ;; output "=" and rescan from next.
 701                             `((write ?=)
 702                               (read r0)
 703                               (repeat))))
 704                          ((eq r0 (char-int ?\n))
 705                           (if input-crlf
 706                               ;; '=' [\t ]* r0='\n'
 707                               ;; invalid input (bare LF found) ->
 708                               ;; output "=" and rescan from next.
 709                               `((write ?=)
 710                                 (read r0)
 711                                 (repeat))
 712                             ;; '=' [\t ]* r0='\r\n'
 713                             ;; soft line break found.
 714                             `((read r0)
 715                               (repeat))))
 716                          ((setq tmp (nth r0 mel-ccl-256-to-16-table))
 717                           ;; '=' [\t ]* r0:[0-9A-F]
 718                           ;; upper nibble of hexadecimal digit found.
 719                           `((r1 = (r0 + 0))
 720                             (r0 = ,tmp)))
 721                          (t
 722                           ;; '=' [\t ]* r0:[^\r0-9A-F]
 723                           ;; invalid input ->
 724                           ;; output "=" and rescan from r0.
 725                           `((write ?=)
 726                             (repeat)))))
 727                       mel-ccl-256-table))
 728                   ;; '=' [\t ]* r1:r0:[0-9A-F]
 729                   (read-branch
 730                    r2
 731                    ,@(mapcar
 732                       (lambda (r2)
 733                         (if (setq tmp (nth r2 mel-ccl-256-to-16-table))
 734                             ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[0-9A-F]
 735                             `(write-read-repeat
 736                               r0
 737                               ,(vconcat
 738                                 (mapcar
 739                                  (lambda (r0)
 740                                    (logior (lsh r0 4) tmp))
 741                                  mel-ccl-16-table)))
 742                           ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 743                           ;; invalid input
 744                           `(r3 = 0)     ; nop
 745                           ))
 746                       mel-ccl-256-table))
 747                   ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 748                   ;; invalid input ->
 749                   ;; output "=" with hex digit and rescan from r2.
 750                   (write ?=)
 751                   (r0 = (r2 + 0))
 752                   (write-repeat r1)))
 753                (t
 754                 ;; r0:[^\t\r -~]
 755                 ;; invalid character found.
 756                 ;; -> ignore.
 757                 `((read r0)
 758                   (repeat))))))
 759           mel-ccl-256-table))
 760       ;; r1[0]:[\t ]
 761       (loop
 762        ,@(apply
 763           'append
 764           (mapcar
 765            (lambda (regnum)
 766              (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 767                (apply
 768                 'append
 769                 (mapcar
 770                  (lambda (bit)
 771                    (if (= bit 0)
 772                        (if (= regnum 0)
 773                            nil
 774                          `((read r0)
 775                            (if (r0 == ?\t)
 776                                (,reg = 0)
 777                              (if (r0 == ?\ )
 778                                  (,reg = 1)
 779                                ((r6 = ,(+ (* regnum 28) bit))
 780                                 (break))))))
 781                      `((read r0)
 782                        (if (r0 == ?\ )
 783                            (,reg |= ,(lsh 1 bit))
 784                          (if (r0 != ?\t)
 785                              ((r6 = ,(+ (* regnum 28) bit))
 786                               (break)))))))
 787                  mel-ccl-28-table))))
 788            '(0 1 2 3 4)))
 789        ;; white space buffer exhaust.
 790        ;; error: line length limit (76bytes) violation.
 791        ;; -> ignore these white spaces.
 792        (repeat))
 793       ,(if input-crlf
 794            `(if (r0 == ?\r)
 795                 ((read r0)
 796                  (if (r0 == ?\n)
 797                      ;; trailing white spaces found.
 798                      ;; -> ignore these white spacs.
 799                      ((write ,(if output-crlf "\r\n" "\n"))
 800                       (read r0)
 801                       (repeat))
 802                    ;; [\t ]* \r r0:[^\n]
 803                    ;; error: bare CR found.
 804                    ;; -> output white spaces and ignore bare CR.
 805                    ))
 806               ;; [\t ]* r0:[^\r]
 807               ;; middle white spaces found.
 808               )
 809          `(if (r0 == ?\n)
 810               ;; trailing white spaces found.
 811               ;; -> ignore these white spacs.
 812               ((write ,(if output-crlf "\r\n" "\n"))
 813                (read r0)
 814                (repeat))
 815             ;; [\t ]* r0:[^\n]
 816             ;; middle white spaces found.
 817             ))
 818       ,@(apply
 819          'append
 820          (mapcar
 821           (lambda (regnum)
 822             (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 823               (apply
 824                'append
 825                (mapcar
 826                 (lambda (bit)
 827                   `((if (,reg & ,(lsh 1 bit))
 828                         (write ?\ )
 829                       (write ?\t))
 830                     (if (r6 == ,(+ (* regnum 28) bit 1))
 831                         (repeat))))
 832                 mel-ccl-28-table))))
 833           '(0 1 2 3 4)))
 834       (repeat)
 835       ))))
 836
 837 )
 838
 839 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-crlf
 840   (mel-ccl-encode-quoted-printable-generic t t))
 841
 842 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-lf
 843   (mel-ccl-encode-quoted-printable-generic t nil))
 844
 845 (define-ccl-program mel-ccl-encode-quoted-printable-lf-crlf
 846   (mel-ccl-encode-quoted-printable-generic nil t))
 847
 848 (define-ccl-program mel-ccl-encode-quoted-printable-lf-lf
 849   (mel-ccl-encode-quoted-printable-generic nil nil))
 850
 851 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-crlf
 852   (mel-ccl-decode-quoted-printable-generic t t))
 853
 854 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-lf
 855   (mel-ccl-decode-quoted-printable-generic t nil))
 856
 857 (define-ccl-program mel-ccl-decode-quoted-printable-lf-crlf
 858   (mel-ccl-decode-quoted-printable-generic nil t))
 859
 860 (define-ccl-program mel-ccl-decode-quoted-printable-lf-lf
 861   (mel-ccl-decode-quoted-printable-generic nil nil))
 862
 863
 864 ;;; @ coding system
 865 ;;;
 866
 867 (make-ccl-coding-system
 868  'mel-ccl-uq-rev ?Q "MIME Q-encoding in unstructured field (reversed)"
 869  'mel-ccl-encode-uq 'mel-ccl-decode-q)
 870
 871 (make-ccl-coding-system
 872  'mel-ccl-cq-rev ?Q "MIME Q-encoding in comment (reversed)"
 873  'mel-ccl-encode-cq 'mel-ccl-decode-q)
 874
 875 (make-ccl-coding-system
 876  'mel-ccl-pq-rev ?Q "MIME Q-encoding in phrase (reversed)"
 877  'mel-ccl-encode-pq 'mel-ccl-decode-q)
 878
 879 (make-ccl-coding-system
 880  'mel-ccl-quoted-printable-crlf-crlf-rev
 881  ?Q "MIME Quoted-Printable-encoding (reversed)"
 882  'mel-ccl-encode-quoted-printable-crlf-crlf
 883  'mel-ccl-decode-quoted-printable-crlf-crlf)
 884
 885 (make-ccl-coding-system
 886  'mel-ccl-quoted-printable-lf-crlf-rev
 887  ?Q "MIME Quoted-Printable-encoding (LF encoding) (reversed)"
 888  'mel-ccl-encode-quoted-printable-crlf-lf
 889  'mel-ccl-decode-quoted-printable-lf-crlf)
 890
 891 (make-ccl-coding-system
 892  'mel-ccl-quoted-printable-crlf-lf-rev
 893  ?Q "MIME Quoted-Printable-encoding (LF internal) (reversed)"
 894  'mel-ccl-encode-quoted-printable-lf-crlf
 895  'mel-ccl-decode-quoted-printable-crlf-lf)
 896
 897 (make-ccl-coding-system
 898  'mel-ccl-quoted-printable-lf-lf-rev
 899  ?Q "MIME Quoted-Printable-encoding (LF encoding) (LF internal) (reversed)"
 900  'mel-ccl-encode-quoted-printable-lf-lf
 901  'mel-ccl-decode-quoted-printable-lf-lf)
 902
 903
 904 ;;; @ quoted-printable
 905 ;;;
 906
 907 (check-broken-facility ccl-execute-eof-block-on-decoding-some)
 908
 909 (unless-broken ccl-execute-eof-block-on-decoding-some
 910
 911   (defun quoted-printable-ccl-encode-string (string)
 912     "Encode STRING with quoted-printable encoding."
 913     (decode-coding-string
 914      string
 915      'mel-ccl-quoted-printable-lf-lf-rev))
 916
 917   (defun quoted-printable-ccl-encode-region (start end)
 918     "Encode the region from START to END with quoted-printable encoding."
 919     (interactive "r")
 920     (decode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 921
 922   (defun quoted-printable-ccl-insert-encoded-file (filename)
 923     "Encode contents of the file named as FILENAME, and insert it."
 924     (interactive (list (read-file-name "Insert encoded file: ")))
 925     (insert-file-contents-as-coding-system
 926      'mel-ccl-quoted-printable-lf-lf-rev filename))
 927
 928   (mel-define-method-function
 929    (mime-encode-string string (nil "quoted-printable"))
 930    'quoted-printable-ccl-encode-string)
 931   (mel-define-method-function
 932    (mime-encode-region start end (nil "quoted-printable"))
 933    'quoted-printable-ccl-encode-region)
 934   (mel-define-method-function
 935    (mime-insert-encoded-file filename (nil "quoted-printable"))
 936    'quoted-printable-ccl-insert-encoded-file)
 937   )
 938
 939 (defun quoted-printable-ccl-decode-string (string)
 940   "Decode quoted-printable encoded STRING."
 941   (encode-coding-string
 942    string
 943    'mel-ccl-quoted-printable-lf-lf-rev))
 944
 945 (defun quoted-printable-ccl-decode-region (start end)
 946   "Decode the region from START to END with quoted-printable
 947 encoding."
 948   (interactive "r")
 949   (encode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 950
 951 (defun quoted-printable-ccl-write-decoded-region
 952   (start end filename)
 953   "Decode quoted-printable encoded current region and write out to FILENAME."
 954   (interactive
 955    (list (region-beginning) (region-end)
 956          (read-file-name "Write decoded region to file: ")))
 957   (write-region-as-coding-system 'mel-ccl-quoted-printable-lf-lf-rev
 958                                  start end filename))
 959
 960 (mel-define-method-function
 961  (mime-decode-string string (nil "quoted-printable"))
 962  'quoted-printable-ccl-decode-string)
 963 (mel-define-method-function
 964  (mime-decode-region start end (nil "quoted-printable"))
 965  'quoted-printable-ccl-decode-region)
 966 (mel-define-method-function
 967  (mime-write-decoded-region start end filename (nil "quoted-printable"))
 968  'quoted-printable-ccl-write-decoded-region)
 969
 970
 971 ;;; @ Q
 972 ;;;
 973
 974 (defun q-encoding-ccl-encode-string (string &optional mode)
 975   "Encode STRING to Q-encoding of encoded-word, and return the result.
 976 MODE allows `text', `comment', `phrase' or nil.  Default value is
 977 `phrase'."
 978   (decode-coding-string
 979    string
 980    (cond
 981     ((eq mode 'text) 'mel-ccl-uq-rev)
 982     ((eq mode 'comment) 'mel-ccl-cq-rev)
 983     (t 'mel-ccl-pq-rev))))
 984
 985 (defun q-encoding-ccl-decode-string (string)
 986   "Decode Q encoded STRING and return the result."
 987   (encode-coding-string
 988    string
 989    'mel-ccl-uq-rev))
 990
 991 (unless (featurep 'xemacs)
 992   (defun q-encoding-ccl-encoded-length (string &optional mode)
 993     (let ((status [nil nil nil nil nil nil nil nil nil]))
 994       (fillarray status nil)
 995       (ccl-execute-on-string
 996        (cond
 997         ((eq mode 'text) 'mel-ccl-count-uq)
 998         ((eq mode 'comment) 'mel-ccl-count-cq)
 999         (t 'mel-ccl-count-pq))
1000        status
1001        string)
1002       (aref status 0)))
1003   )
1004
1005 (mel-define-method-function (encoded-text-encode-string string (nil "Q"))
1006                             'q-encoding-ccl-encode-string)
1007
1008 (mel-define-method encoded-text-decode-string (string (nil "Q"))
1009   (if (and (string-match Q-encoded-text-regexp string)
1010            (string= string (match-string 0 string)))
1011       (q-encoding-ccl-decode-string string)
1012     (error "Invalid encoded-text %s" string)))
1013
1014
1015 ;;; @ end
1016 ;;;
1017
1018 (provide 'mel-q-ccl)
1019
1020 ;;; mel-q-ccl.el ends here