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 ;; Generated CCL program works not properly on 20.2 because CCL_EOF_BLOCK
 252 ;; is not executed.
 253 (defun mel-ccl-encode-quoted-printable-generic (input-crlf output-crlf)
 254   `(4
 255     ((r6 = 0)                           ; column
 256      (r5 = 0)                           ; previous character is white space
 257      (r4 = 0)                           ; label for eof block
 258      (read r0)
 259      (loop                              ; r6 <= 75
 260       (loop
 261        (loop
 262         (branch
 263          r0
 264          ,@(mapcar
 265             (lambda (r0)
 266               (let ((tmp (aref mel-ccl-qp-table r0)))
 267                 (cond
 268                  ((eq r0 (char-int ?F))
 269                   `(if (r6 == 0)
 270                        ((r4 = 15) (read-if (r0 == ?r)
 271                         ((r4 = 16) (read-if (r0 == ?o)
 272                          ((r4 = 17) (read-if (r0 == ?m)
 273                           ((r4 = 18) (read-if (r0 == ? )
 274                            ((r6 = 7)
 275                             (r5 = 1)
 276                             (write "=46rom ")
 277                             (r4 = 19)
 278                             (read r0)
 279                             (repeat))
 280                            ((r6 = 4)
 281                             (write-repeat "From"))))
 282                           ((r6 = 3)
 283                            (write-repeat "Fro"))))
 284                          ((r6 = 2)
 285                           (write-repeat "Fr"))))
 286                         ((r6 = 1)
 287                          (write-repeat "F"))))
 288                      ((r3 = 0) (break)) ; RAW
 289                      ))
 290                  ((eq r0 (char-int ?.))
 291                   `(if (r6 == 0)
 292                        ,(mel-ccl-try-to-read-crlf
 293                          input-crlf
 294                          'r0 'r4 20 21 22
 295                          `((write ,(if output-crlf "=2E\r\n" "=2E\n"))
 296                            (r4 = 23)
 297                            (read r0)
 298                            (repeat))
 299                          '((r6 = 1)
 300                            (write-repeat "."))
 301                          '((r6 = 4)
 302                            (write-repeat ".=0D"))
 303                          '((r6 = 1)
 304                            (write-repeat ".")))
 305                      ((r3 = 0) (break)) ; RAW
 306                      ))
 307                  ((eq tmp 'raw) '((r3 = 0) (break))) ; RAW
 308                  ((eq tmp 'enc) '((r3 = 1) (break))) ; ENC
 309                  ((eq tmp 'wsp) '((r3 = 2) (break))) ; WSP
 310                  ((eq tmp 'cr) (if input-crlf
 311                                    '((r3 = 3) (break)) ; CR
 312                                  '((r3 = 1) (break)))) ; ENC
 313                  ((eq tmp 'lf) (if input-crlf
 314                                    '((r3 = 1) (break)) ; ENC
 315                                  '((r3 = 3) (break)))) ; CRLF
 316                  )))
 317             mel-ccl-256-table)))
 318        (branch
 319         r3
 320         ;; r0:r3=RAW
 321         (if (r6 < 75)
 322             ((r6 += 1)
 323              (r5 = 0)
 324              (r4 = 1)
 325              (write-read-repeat r0))
 326           (break))
 327         ;; r0:r3=ENC
 328         ((r5 = 0)
 329          (if (r6 < 73)
 330              ((r6 += 3)
 331               (write "=")
 332               (write r0 ,mel-ccl-high-table)
 333               (r4 = 2)
 334               (write-read-repeat r0 ,mel-ccl-low-table))
 335            (if (r6 > 73)
 336                ((r6 = 3)
 337                 (write ,(if output-crlf "=\r\n=" "=\n="))
 338                 (write r0 ,mel-ccl-high-table)
 339                 (r4 = 3)
 340                 (write-read-repeat r0 ,mel-ccl-low-table))
 341              (break))))
 342         ;; r0:r3=WSP
 343         (if (r6 < 74)
 344             (break)
 345           (if (r6 < 75)
 346               ((r6 += 1)
 347                (r5 = 1)
 348                (r4 = 4)
 349                (write-read-repeat r0))
 350             ((write ,(if output-crlf "=\r\n" "=\n"))
 351              (r6 = 0)
 352              (r5 = 0)
 353              ;; (r4 = 5)
 354              (repeat))))
 355         ;; r0:r3=CR/CRLF
 356         ,(if input-crlf
 357              ;; r0:r3=CR
 358              `((if ((r6 > 73) & r5)
 359                    ((r6 = 0)
 360                     (r5 = 0)
 361                     (write ,(if output-crlf "=\r\n" "=\n"))))
 362                (break))
 363            ;; r0:r3=CRLF
 364            `(if r5
 365                 ;; WSP ; r0:r3=CRLF
 366                 ((r5 = 0)
 367                  (r6 = 0)
 368                  (write ,(if output-crlf "=\r\n" "=\n"))
 369                  ,@(if output-crlf '((write ?\r)) '())
 370                  (r4 = 0)
 371                  (write-read-repeat r0))
 372               ;; noWSP ; r0:r3=CRLF
 373               ((r5 = 0)
 374                (r6 = 0)
 375                ,@(if output-crlf '((write ?\r)) '())
 376                (r4 = 0)
 377                (write-read-repeat r0)))
 378            )))
 379       ;; r0:r3={RAW,ENC,WSP,CR}
 380       (loop
 381        ,(funcall
 382          (lambda (after-cr after-raw-enc-wsp)
 383            (if input-crlf
 384                `(if (r0 == ?\r)
 385                     ,after-cr
 386                   ,after-raw-enc-wsp)
 387              after-raw-enc-wsp))
 388          ;; r0=\r:r3=CR
 389          `((r4 = 6)
 390            (read r0)
 391            ;; CR:r3=CR r0
 392            (if (r0 == ?\n)
 393                ;; CR:r3=CR r0=LF
 394                (if r5
 395                    ;; r5=WSP ; CR:r3=CR r0=LF
 396                    ((r6 = 0)
 397                     (r5 = 0)
 398                     (write ,(if output-crlf "=\r\n\r\n" "=\n\n"))
 399                     (r4 = 7)
 400                     (read r0)
 401                     (break))
 402                  ;; r5=noWSP ; CR:r3=CR r0=LF
 403                  ((r6 = 0)
 404                   (r5 = 0)
 405                   (write ,(if output-crlf "\r\n" "\n"))
 406                   (r4 = 8)
 407                   (read r0)
 408                   (break)))
 409              ;; CR:r3=CR r0=noLF
 410              (if (r6 < 73)
 411                  ((r6 += 3)
 412                   (r5 = 0)
 413                   (write "=0D")
 414                   (break))
 415                (if (r6 == 73)
 416                    (if (r0 == ?\r)
 417                        ;; CR:r3=CR r0=CR
 418                        ((r4 = 9)
 419                         (read r0)
 420                         ;; CR:r3=CR CR r0
 421                         (if (r0 == ?\n)
 422                             ;; CR:r3=CR CR LF
 423                             ((r6 = 0)
 424                              (r5 = 0)
 425                              (write ,(if output-crlf "=0D\r\n" "=0D\n"))
 426                              (r4 = 10)
 427                              (read r0)
 428                              (break))
 429                           ;; CR:r3=CR CR noLF
 430                           ((r6 = 6)
 431                            (r5 = 0)
 432                            (write ,(if output-crlf "=\r\n=0D=0D" "=\n=0D=0D"))
 433                            (break))))
 434                      ;; CR:r3=CR r0=noLFnorCR
 435                      ((r6 = 3)
 436                       (r5 = 0)
 437                       (write ,(if output-crlf "=\r\n=0D" "=\n=0D"))
 438                       (break)))
 439                  ((r6 = 3)
 440                   (r5 = 0)
 441                   (write ,(if output-crlf "=\r\n=0D" "=\n=0D"))
 442                   (break))))))
 443          (funcall
 444           (lambda (after-newline after-cr-nolf after-nonewline)
 445             (if input-crlf
 446                 ;; r0:r3={RAW,ENC,WSP}
 447                 `((r4 = 11)
 448                   (read r1)
 449                   ;; r0:r3={RAW,ENC,WSP} r1
 450                   (if (r1 == ?\r)
 451                       ;; r0:r3={RAW,ENC,WSP} r1=CR
 452                       ((r4 = 12)
 453                        (read r1)
 454                        ;; r0:r3={RAW,ENC,WSP} CR r1
 455                        (if (r1 == ?\n)
 456                            ;; r0:r3={RAW,ENC,WSP} CR r1=LF
 457                            ,after-newline
 458                          ;; r0:r3={RAW,ENC,WSP} CR r1=noLF
 459                          ,after-cr-nolf))
 460                     ;; r0:r3={RAW,ENC,WSP} r1:noCR
 461                     ,after-nonewline))
 462               ;; r0:r3={RAW,ENC,WSP}
 463               `((r4 = 11)
 464                 (read r1)
 465                 ;; r0:r3={RAW,ENC,WSP} r1
 466                 (if (r1 == ?\n)
 467                     ;; r0:r3={RAW,ENC,WSP} r1=CRLF
 468                     ,after-newline
 469                   ;; r0:r3={RAW,ENC,WSP} r1:noCRLF
 470                   ,after-nonewline))))
 471           ;; after-newline
 472           ;; r0:r3={RAW,ENC,WSP} CR r1=LF
 473           ;; r0:r3={RAW,ENC,WSP} 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=WSP CR r1=LF
 495              ;; r0:r3=WSP r1=CRLF
 496              ((write ?=)
 497               (write r0 ,mel-ccl-high-table)
 498               (write r0 ,mel-ccl-low-table)
 499               (write ,(if output-crlf "\r\n" "\n"))
 500               (r4 = 14)
 501               (read r0)
 502               (break))))
 503           ;; after-cr-nolf
 504           ;; r0:r3={RAW,ENC,WSP} CR r1=noLF
 505           `((branch
 506              r3
 507              ;; r0:r3=RAW CR r1:noLF
 508              ((r6 = 4)
 509               (r5 = 0)
 510               (write ,(if output-crlf "=\r\n" "=\n"))
 511               (write r0)
 512               (write "=0D")
 513               (r0 = (r1 + 0)) ; "+ 0" is workaround for mule 2.3@19.34.
 514               (break))
 515              ;; r0:r3=ENC CR r1:noLF
 516              ((r6 = 6)
 517               (r5 = 0)
 518               (write ,(if output-crlf "=\r\n=" "=\n="))
 519               (write r0 ,mel-ccl-high-table)
 520               (write r0 ,mel-ccl-low-table)
 521               (write "=0D")
 522               (r0 = (r1 + 0))
 523               (break))
 524              ;; r0:r3=WSP CR r1:noLF
 525              ((r5 = 0)
 526               (write r0)
 527               (r0 = (r1 + 0))
 528               (if (r6 < 72)
 529                   ((write "=0D")
 530                    (r6 += 4)
 531                    (break))
 532                 ;; If r6 is 72, and r1 is CR and the next byte is LF,
 533                 ;; we can write r0, "=0D" and hard linebreak.
 534                 ;; But the next byte is unknown and reading it causes buffering problem.
 535                 ;; So, we give up and write soft linebreak.
 536                 ((write ,(if output-crlf "=\r\n=0D" "=\n=0D"))
 537                  (r6 = 3)
 538                  (break))))))
 539           ;; after-nonewline
 540           ;; r0:r3={RAW,ENC,WSP} r1:noCR
 541           ;; r0:r3={RAW,ENC,WSP} r1:noCRLF
 542           `((branch
 543              r3
 544              ;; r0:r3=RAW r1:noCR
 545              ;; r0:r3=RAW r1:noCRLF
 546              ((r6 = 1)
 547               (r5 = 0)
 548               (write ,(if output-crlf "=\r\n" "=\n"))
 549               (write r0)
 550               (r0 = (r1 + 0))
 551               (break))
 552              ;; r0:r3=ENC r1:noCR
 553              ;; r0:r3=ENC r1:noCRLF
 554              ((r6 = 3)
 555               (r5 = 0)
 556               (write ,(if output-crlf "=\r\n=" "=\n="))
 557               (write r0 ,mel-ccl-high-table)
 558               (write r0 ,mel-ccl-low-table)
 559               (r0 = (r1 + 0))
 560               (break))
 561              ;; r0:r3=WSP r1:noCR
 562              ;; r0:r3=WSP r1:noCRLF
 563              ((r6 += 1)
 564               (r5 = 1)
 565               (write r0)
 566               (r0 = (r1 + 0))
 567               (break))
 568              )))))
 569       (repeat)))
 570     ;; EOF
 571     (                                   ;(write "[EOF:") (write r4 ,mel-ccl-high-table) (write r4 ,mel-ccl-low-table) (write "]")
 572      (branch
 573       r4
 574       ;; 0: (start) ;
 575       (end)
 576       ;; 1: RAW ;
 577       (end)
 578       ;; 2: r0:r3=ENC ;
 579       (end)
 580       ;; 3: SOFTBREAK r0:r3=ENC ;
 581       (end)
 582       ;; 4: r0:r3=WSP ;
 583       ((write ,(if output-crlf "=\r\n" "=\n")) (end))
 584       ;; 5: SOFTBREAK ; r0:r3=WSP
 585       ;; Now this is ignored.
 586       ((write r0)
 587        (write ,(if output-crlf "=\r\n" "=\n")) (end))
 588       ;; 6: ; r0=\r:r3=CR
 589       (if (r6 <= 73)
 590           ((write "=0D") (end))
 591         ((write ,(if output-crlf "=\r\n=0D" "=\n=0D")) (end)))
 592       ;; 7: r5=WSP SOFTBREAK CR:r3=CR r0=LF ;
 593       (end)
 594       ;; 8: r5=noWSP CR:r3=CR r0=LF ;
 595       (end)
 596       ;; 9: (r6=73) ; CR:r3=CR r0=CR
 597       ((write ,(if output-crlf "=\r\n=0D=0D" "=\n=0D=0D")) (end))
 598       ;; 10: (r6=73) CR:r3=CR CR LF ;
 599       (end)
 600       ;; 11: ; r0:r3={RAW,ENC,WSP}
 601       (branch
 602        r3
 603        ((write r0) (end))
 604        ((write "=")
 605         (write r0 ,mel-ccl-high-table)
 606         (write r0 ,mel-ccl-low-table)
 607         (end))
 608        ((write "=")
 609         (write r0 ,mel-ccl-high-table)
 610         (write r0 ,mel-ccl-low-table)
 611         (end)))
 612       ;; 12: ; r0:r3={RAW,ENC,WSP} r1=CR
 613       (branch
 614        r3
 615        ;; ; r0:r3=RAW r1=CR
 616        ((write ,(if output-crlf "=\r\n" "=\n"))
 617         (write r0)
 618         (write "=0D")
 619         (end))
 620        ;; ; r0:r3=ENC r1=CR
 621        ((write ,(if output-crlf "=\r\n=" "=\n="))
 622         (write r0 ,mel-ccl-high-table)
 623         (write r0 ,mel-ccl-low-table)
 624         (write "=0D")
 625         (end))
 626        ;; ; r0:r3=WSP r1=CR
 627        ((write ,(if output-crlf "=\r\n=" "=\n="))
 628         (write r0)
 629         (write "=0D")))
 630       ;; 13: r0:r3=RAW CR LF ;
 631       ;; 13: r0:r3=RAW CRLF ;
 632       (end)
 633       ;; 14: r0:r3=ENC CR LF ;
 634       ;; 14: r0:r3=ENC CRLF ;
 635       ;; 14: r0:r3=WSP CR LF ;
 636       ;; 14: r0:r3=WSP CRLF ;
 637       (end)
 638       ;; 15: r6=0 ; "F"
 639       ((write "F") (end))
 640       ;; 16: r6=0 ; "Fr"
 641       ((write "Fr") (end))
 642       ;; 17: r6=0 ; "Fro"
 643       ((write "Fro") (end))
 644       ;; 18: r6=0 ; "From"
 645       ((write "From") (end))
 646       ;; 19: r6=0 "From " ;
 647       (end)
 648       ;; 20: r6=0 ; "."
 649       ((write ".") (end))
 650       ;; 21: r6=0 ; ".\r"
 651       ((write ".=0D") (end))
 652       ;; 22: r6=0 ; "."
 653       ((write ".") (end))
 654       ;; 23: r6=0 ".\r\n" ;
 655       (end)
 656       ))
 657     ))
 658
 659 (defun mel-ccl-decode-quoted-printable-generic (input-crlf output-crlf)
 660   `(1
 661     ((read r0)
 662      (loop
 663       (branch
 664        r0
 665        ,@(mapcar
 666           (lambda (r0)
 667             (let ((tmp (aref mel-ccl-qp-table r0)))
 668               (cond
 669                ((eq tmp 'raw) `(write-read-repeat r0))
 670                ((eq tmp 'wsp) (if (eq r0 (char-int ? ))
 671                                   `(r1 = 1)
 672                                 `(r1 = 0)))
 673                ((eq tmp 'cr)
 674                 (if input-crlf
 675                     ;; r0='\r'
 676                     `((read r0)
 677                       ;; '\r' r0
 678                       (if (r0 == ?\n)
 679                           ;; '\r' r0='\n'
 680                           ;; hard line break found.
 681                           ,(if output-crlf
 682                                '((write ?\r)
 683                                  (write-read-repeat r0))
 684                              '(write-read-repeat r0))
 685                         ;; '\r' r0:[^\n]
 686                         ;; invalid control character (bare CR) found.
 687                         ;; -> ignore it and rescan from r0.
 688                         (repeat)))
 689                   ;; r0='\r'
 690                   ;; invalid character (bare CR) found.
 691                   ;; -> ignore.
 692                   `((read r0)
 693                     (repeat))))
 694                ((eq tmp 'lf)
 695                 (if input-crlf
 696                     ;; r0='\n'
 697                     ;; invalid character (bare LF) found.
 698                     ;; -> ignore.
 699                     `((read r0)
 700                       (repeat))
 701                   ;; r0='\r\n'
 702                   ;; hard line break found.
 703                   (if output-crlf
 704                       '((write ?\r)
 705                         (write-read-repeat r0))
 706                     '(write-read-repeat r0))))
 707                ((eq r0 (char-int ?=))
 708                 ;; r0='='
 709                 `((read r0)
 710                   ;; '=' r0
 711                   (r1 = (r0 == ?\t))
 712                   (if ((r0 == ? ) | r1)
 713                       ;; '=' r0:[\t ]
 714                       ;; Skip transport-padding.
 715                       ;; It should check CR LF after
 716                       ;; transport-padding.
 717                       (loop
 718                        (read-if (r0 == ?\t)
 719                                 (repeat)
 720                                 (if (r0 == ? )
 721                                     (repeat)
 722                                   (break)))))
 723                   ;; '=' [\t ]* r0:[^\t ]
 724                   (branch
 725                    r0
 726                    ,@(mapcar
 727                       (lambda (r0)
 728                         (cond
 729                          ((eq r0 (char-int ?\r))
 730                           (if input-crlf
 731                               ;; '=' [\t ]* r0='\r'
 732                               `((read r0)
 733                                 ;; '=' [\t ]* '\r' r0
 734                                 (if (r0 == ?\n)
 735                                     ;; '=' [\t ]* '\r' r0='\n'
 736                                     ;; soft line break found.
 737                                     ((read r0)
 738                                      (repeat))
 739                                   ;; '=' [\t ]* '\r' r0:[^\n]
 740                                   ;; invalid input ->
 741                                   ;; output "=" and rescan from r0.
 742                                   ((write "=")
 743                                    (repeat))))
 744                             ;; '=' [\t ]* r0='\r'
 745                             ;; invalid input (bare CR found) ->
 746                             ;; output "=" and rescan from next.
 747                             `((write ?=)
 748                               (read r0)
 749                               (repeat))))
 750                          ((eq r0 (char-int ?\n))
 751                           (if input-crlf
 752                               ;; '=' [\t ]* r0='\n'
 753                               ;; invalid input (bare LF found) ->
 754                               ;; output "=" and rescan from next.
 755                               `((write ?=)
 756                                 (read r0)
 757                                 (repeat))
 758                             ;; '=' [\t ]* r0='\r\n'
 759                             ;; soft line break found.
 760                             `((read r0)
 761                               (repeat))))
 762                          ((setq tmp (nth r0 mel-ccl-256-to-16-table))
 763                           ;; '=' [\t ]* r0:[0-9A-F]
 764                           ;; upper nibble of hexadecimal digit found.
 765                           `((r1 = (r0 + 0))
 766                             (r0 = ,tmp)))
 767                          (t
 768                           ;; '=' [\t ]* r0:[^\r0-9A-F]
 769                           ;; invalid input ->
 770                           ;; output "=" and rescan from r0.
 771                           `((write ?=)
 772                             (repeat)))))
 773                       mel-ccl-256-table))
 774                   ;; '=' [\t ]* r1:r0:[0-9A-F]
 775                   (read-branch
 776                    r2
 777                    ,@(mapcar
 778                       (lambda (r2)
 779                         (if (setq tmp (nth r2 mel-ccl-256-to-16-table))
 780                             ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[0-9A-F]
 781                             `(write-read-repeat
 782                               r0
 783                               ,(vconcat
 784                                 (mapcar
 785                                  (lambda (r0)
 786                                    (logior (lsh r0 4) tmp))
 787                                  mel-ccl-16-table)))
 788                           ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 789                           ;; invalid input
 790                           `(r3 = 0)     ; nop
 791                           ))
 792                       mel-ccl-256-table))
 793                   ;; '=' [\t ]* r1:r0:[0-9A-F] r2:[^0-9A-F]
 794                   ;; invalid input ->
 795                   ;; output "=" with hex digit and rescan from r2.
 796                   (write ?=)
 797                   (r0 = (r2 + 0))
 798                   (write-repeat r1)))
 799                (t
 800                 ;; r0:[^\t\r -~]
 801                 ;; invalid character found.
 802                 ;; -> ignore.
 803                 `((read r0)
 804                   (repeat))))))
 805           mel-ccl-256-table))
 806       ;; r1[0]:[\t ]
 807       (loop
 808        ,@(apply
 809           'append
 810           (mapcar
 811            (lambda (regnum)
 812              (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 813                (apply
 814                 'append
 815                 (mapcar
 816                  (lambda (bit)
 817                    (if (= bit 0)
 818                        (if (= regnum 0)
 819                            nil
 820                          `((read r0)
 821                            (if (r0 == ?\t)
 822                                (,reg = 0)
 823                              (if (r0 == ?\ )
 824                                  (,reg = 1)
 825                                ((r6 = ,(+ (* regnum 28) bit))
 826                                 (break))))))
 827                      `((read r0)
 828                        (if (r0 == ?\ )
 829                            (,reg |= ,(lsh 1 bit))
 830                          (if (r0 != ?\t)
 831                              ((r6 = ,(+ (* regnum 28) bit))
 832                               (break)))))))
 833                  mel-ccl-28-table))))
 834            '(0 1 2 3 4)))
 835        ;; white space buffer exhaust.
 836        ;; error: line length limit (76bytes) violation.
 837        ;; -> ignore these white spaces.
 838        (repeat))
 839       ,(if input-crlf
 840            `(if (r0 == ?\r)
 841                 ((read r0)
 842                  (if (r0 == ?\n)
 843                      ;; trailing white spaces found.
 844                      ;; -> ignore these white spacs.
 845                      ((write ,(if output-crlf "\r\n" "\n"))
 846                       (read r0)
 847                       (repeat))
 848                    ;; [\t ]* \r r0:[^\n]
 849                    ;; error: bare CR found.
 850                    ;; -> output white spaces and ignore bare CR.
 851                    ))
 852               ;; [\t ]* r0:[^\r]
 853               ;; middle white spaces found.
 854               )
 855          `(if (r0 == ?\n)
 856               ;; trailing white spaces found.
 857               ;; -> ignore these white spacs.
 858               ((write ,(if output-crlf "\r\n" "\n"))
 859                (read r0)
 860                (repeat))
 861             ;; [\t ]* r0:[^\n]
 862             ;; middle white spaces found.
 863             ))
 864       ,@(apply
 865          'append
 866          (mapcar
 867           (lambda (regnum)
 868             (let ((reg (aref [r1 r2 r3 r4 r5] regnum)))
 869               (apply
 870                'append
 871                (mapcar
 872                 (lambda (bit)
 873                   `((if (,reg & ,(lsh 1 bit))
 874                         (write ?\ )
 875                       (write ?\t))
 876                     (if (r6 == ,(+ (* regnum 28) bit 1))
 877                         (repeat))))
 878                 mel-ccl-28-table))))
 879           '(0 1 2 3 4)))
 880       (repeat)
 881       ))))
 882
 883 )
 884
 885 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-crlf
 886   (mel-ccl-encode-quoted-printable-generic t t))
 887
 888 (define-ccl-program mel-ccl-encode-quoted-printable-crlf-lf
 889   (mel-ccl-encode-quoted-printable-generic t nil))
 890
 891 (define-ccl-program mel-ccl-encode-quoted-printable-lf-crlf
 892   (mel-ccl-encode-quoted-printable-generic nil t))
 893
 894 (define-ccl-program mel-ccl-encode-quoted-printable-lf-lf
 895   (mel-ccl-encode-quoted-printable-generic nil nil))
 896
 897 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-crlf
 898   (mel-ccl-decode-quoted-printable-generic t t))
 899
 900 (define-ccl-program mel-ccl-decode-quoted-printable-crlf-lf
 901   (mel-ccl-decode-quoted-printable-generic t nil))
 902
 903 (define-ccl-program mel-ccl-decode-quoted-printable-lf-crlf
 904   (mel-ccl-decode-quoted-printable-generic nil t))
 905
 906 (define-ccl-program mel-ccl-decode-quoted-printable-lf-lf
 907   (mel-ccl-decode-quoted-printable-generic nil nil))
 908
 909
 910 ;;; @ coding system
 911 ;;;
 912
 913 (make-ccl-coding-system
 914  'mel-ccl-uq-rev ?Q "MIME Q-encoding in unstructured field (reversed)"
 915  'mel-ccl-encode-uq 'mel-ccl-decode-q)
 916
 917 (make-ccl-coding-system
 918  'mel-ccl-cq-rev ?Q "MIME Q-encoding in comment (reversed)"
 919  'mel-ccl-encode-cq 'mel-ccl-decode-q)
 920
 921 (make-ccl-coding-system
 922  'mel-ccl-pq-rev ?Q "MIME Q-encoding in phrase (reversed)"
 923  'mel-ccl-encode-pq 'mel-ccl-decode-q)
 924
 925 (make-ccl-coding-system
 926  'mel-ccl-quoted-printable-crlf-crlf-rev
 927  ?Q "MIME Quoted-Printable-encoding (reversed)"
 928  'mel-ccl-encode-quoted-printable-crlf-crlf
 929  'mel-ccl-decode-quoted-printable-crlf-crlf)
 930
 931 (make-ccl-coding-system
 932  'mel-ccl-quoted-printable-lf-crlf-rev
 933  ?Q "MIME Quoted-Printable-encoding (LF encoding) (reversed)"
 934  'mel-ccl-encode-quoted-printable-crlf-lf
 935  'mel-ccl-decode-quoted-printable-lf-crlf)
 936
 937 (make-ccl-coding-system
 938  'mel-ccl-quoted-printable-crlf-lf-rev
 939  ?Q "MIME Quoted-Printable-encoding (LF internal) (reversed)"
 940  'mel-ccl-encode-quoted-printable-lf-crlf
 941  'mel-ccl-decode-quoted-printable-crlf-lf)
 942
 943 (make-ccl-coding-system
 944  'mel-ccl-quoted-printable-lf-lf-rev
 945  ?Q "MIME Quoted-Printable-encoding (LF encoding) (LF internal) (reversed)"
 946  'mel-ccl-encode-quoted-printable-lf-lf
 947  'mel-ccl-decode-quoted-printable-lf-lf)
 948
 949
 950 ;;; @ quoted-printable
 951 ;;;
 952
 953 (check-broken-facility ccl-execute-eof-block-on-decoding-some)
 954
 955 (unless-broken ccl-execute-eof-block-on-decoding-some
 956
 957   (defun quoted-printable-ccl-encode-string (string)
 958     "Encode STRING with quoted-printable encoding."
 959     (decode-coding-string
 960      string
 961      'mel-ccl-quoted-printable-lf-lf-rev))
 962
 963   (defun quoted-printable-ccl-encode-region (start end)
 964     "Encode the region from START to END with quoted-printable encoding."
 965     (interactive "r")
 966     (decode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 967
 968   (defun quoted-printable-ccl-insert-encoded-file (filename)
 969     "Encode contents of the file named as FILENAME, and insert it."
 970     (interactive (list (read-file-name "Insert encoded file: ")))
 971     (let ((coding-system-for-read 'mel-ccl-quoted-printable-lf-lf-rev))
 972       (insert-file-contents filename)))
 973
 974   (mel-define-method-function
 975    (mime-encode-string string (nil "quoted-printable"))
 976    'quoted-printable-ccl-encode-string)
 977   (mel-define-method-function
 978    (mime-encode-region start end (nil "quoted-printable"))
 979    'quoted-printable-ccl-encode-region)
 980   (mel-define-method-function
 981    (mime-insert-encoded-file filename (nil "quoted-printable"))
 982    'quoted-printable-ccl-insert-encoded-file)
 983   )
 984
 985 (defun quoted-printable-ccl-decode-string (string)
 986   "Decode quoted-printable encoded STRING."
 987   (encode-coding-string
 988    string
 989    'mel-ccl-quoted-printable-lf-lf-rev))
 990
 991 (defun quoted-printable-ccl-decode-region (start end)
 992   "Decode the region from START to END with quoted-printable
 993 encoding."
 994   (interactive "r")
 995   (encode-coding-region start end 'mel-ccl-quoted-printable-lf-lf-rev))
 996
 997 (defun quoted-printable-ccl-write-decoded-region
 998   (start end filename)
 999   "Decode quoted-printable encoded current region and write out to FILENAME."
1000   (interactive
1001    (list (region-beginning) (region-end)
1002          (read-file-name "Write decoded region to file: ")))
1003   (let ((coding-system-for-write 'mel-ccl-quoted-printable-lf-lf-rev))
1004     (write-region start end filename)))
1005
1006 (mel-define-method-function
1007  (mime-decode-string string (nil "quoted-printable"))
1008  'quoted-printable-ccl-decode-string)
1009 (mel-define-method-function
1010  (mime-decode-region start end (nil "quoted-printable"))
1011  'quoted-printable-ccl-decode-region)
1012 (mel-define-method-function
1013  (mime-write-decoded-region start end filename (nil "quoted-printable"))
1014  'quoted-printable-ccl-write-decoded-region)
1015
1016
1017 ;;; @ Q
1018 ;;;
1019
1020 (defun q-encoding-ccl-encode-string (string &optional mode)
1021   "Encode STRING to Q-encoding of encoded-word, and return the result.
1022 MODE allows `text', `comment', `phrase' or nil.  Default value is
1023 `phrase'."
1024   (decode-coding-string
1025    string
1026    (cond
1027     ((eq mode 'text) 'mel-ccl-uq-rev)
1028     ((eq mode 'comment) 'mel-ccl-cq-rev)
1029     (t 'mel-ccl-pq-rev))))
1030
1031 (defun q-encoding-ccl-decode-string (string)
1032   "Decode Q encoded STRING and return the result."
1033   (encode-coding-string
1034    string
1035    'mel-ccl-uq-rev))
1036
1037 (unless (featurep 'xemacs)
1038   (defun q-encoding-ccl-encoded-length (string &optional mode)
1039     (let ((status [nil nil nil nil nil nil nil nil nil]))
1040       (fillarray status nil)
1041       (ccl-execute-on-string
1042        (cond
1043         ((eq mode 'text) 'mel-ccl-count-uq)
1044         ((eq mode 'comment) 'mel-ccl-count-cq)
1045         (t 'mel-ccl-count-pq))
1046        status
1047        string)
1048       (aref status 0)))
1049   )
1050
1051 (mel-define-method-function (encoded-text-encode-string string (nil "Q"))
1052                             'q-encoding-ccl-encode-string)
1053
1054 (mel-define-method encoded-text-decode-string (string (nil "Q"))
1055   (if (and (string-match Q-encoded-text-regexp string)
1056            (string= string (match-string 0 string)))
1057       (q-encoding-ccl-decode-string string)
1058     (error "Invalid encoded-text %s" string)))
1059
1060
1061 ;;; @ end
1062 ;;;
1063
1064 (provide 'mel-q-ccl)
1065
1066 ;;; mel-q-ccl.el ends here