482 lines
14 KiB
EmacsLisp
482 lines
14 KiB
EmacsLisp
;;; mel-b-ccl.el --- Base64 encoder/decoder using CCL.
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;; Copyright (C) 1998,1999,2000 Free Software Foundation, Inc.
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;; Author: Tanaka Akira <akr@m17n.org>
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;; Created: 1998/9/17
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;; Keywords: MIME, Base64
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;; This file is part of FLIM (Faithful Library about Internet Message).
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2, or (at
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;; your option) any later version.
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Code:
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(require 'ccl)
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(require 'pccl)
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(require 'mime-def)
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;;; @ constants
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;;;
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(eval-when-compile
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(defconst mel-ccl-4-table
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'( 0 1 2 3))
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(defconst mel-ccl-16-table
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'( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15))
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(defconst mel-ccl-64-table
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'( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63))
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(defconst mel-ccl-256-table
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'( 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
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48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
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64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
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80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
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96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
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112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
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128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
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144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
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160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
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176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
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192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
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208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
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224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
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240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255))
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(defconst mel-ccl-256-to-64-table
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'(nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil 62 nil nil nil 63
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52 53 54 55 56 57 58 59 60 61 nil nil nil t nil nil
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nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
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15 16 17 18 19 20 21 22 23 24 25 nil nil nil nil nil
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nil 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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41 42 43 44 45 46 47 48 49 50 51 nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
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nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil))
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(defconst mel-ccl-64-to-256-table
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(mapcar
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'char-int
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
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abcdefghijklmnopqrstuvwxyz\
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0123456789\
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+/"))
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)
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;;; @ CCL programs
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;;;
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(eval-when-compile
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(defun mel-ccl-decode-b-bit-ex (v)
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(logior
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(lsh (logand v (lsh 255 16)) -16)
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(logand v (lsh 255 8))
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(lsh (logand v 255) 16)))
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)
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(eval-when-compile
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(defconst mel-ccl-decode-b-0-table
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(vconcat
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(mapcar
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(lambda (v)
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(if (integerp v)
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(mel-ccl-decode-b-bit-ex (lsh v 18))
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(lsh 1 24)))
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mel-ccl-256-to-64-table)))
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(defconst mel-ccl-decode-b-1-table
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(vconcat
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(mapcar
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(lambda (v)
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(if (integerp v)
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(mel-ccl-decode-b-bit-ex (lsh v 12))
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(lsh 1 25)))
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mel-ccl-256-to-64-table)))
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(defconst mel-ccl-decode-b-2-table
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(vconcat
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(mapcar
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(lambda (v)
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(if (integerp v)
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(mel-ccl-decode-b-bit-ex (lsh v 6))
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(lsh 1 26)))
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mel-ccl-256-to-64-table)))
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(defconst mel-ccl-decode-b-3-table
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(vconcat
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(mapcar
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(lambda (v)
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(if (integerp v)
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(mel-ccl-decode-b-bit-ex v)
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(lsh 1 27)))
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mel-ccl-256-to-64-table)))
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)
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(check-broken-facility ccl-cascading-read)
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(if-broken ccl-cascading-read
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(define-ccl-program mel-ccl-decode-b
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`(1
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(loop
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(loop
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(read-branch
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r1
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,@(mapcar
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(lambda (v)
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(cond
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((or (eq v nil) (eq v t)) '(repeat))
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(t `((r0 = ,(lsh v 2)) (break)))))
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mel-ccl-256-to-64-table)))
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(loop
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(read-branch
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r1
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,@(mapcar
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(lambda (v)
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(cond
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((or (eq v nil) (eq v t)) '(repeat))
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((= (lsh v -4) 0) `((write r0) (r0 = ,(lsh (logand v 15) 4)) (break)))
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(t `((r0 |= ,(lsh v -4)) (write r0) (r0 = ,(lsh (logand v 15) 4)) (break)))))
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mel-ccl-256-to-64-table)))
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(loop
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(read-branch
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r1
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,@(mapcar
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(lambda (v)
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(cond
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((eq v nil) '(repeat))
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((eq v t) '(end))
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((= (lsh v -2) 0) `((write r0) (r0 = ,(lsh (logand v 3) 6)) (break)))
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(t `((r0 |= ,(lsh v -2)) (write r0) (r0 = ,(lsh (logand v 3) 6)) (break)))))
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mel-ccl-256-to-64-table)))
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(loop
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(read-branch
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r1
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,@(mapcar
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(lambda (v)
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(cond
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((eq v nil) '(repeat))
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((eq v t) '(end))
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(t `((r0 |= ,v) (write r0) (break)))))
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mel-ccl-256-to-64-table)))
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(repeat))))
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(define-ccl-program mel-ccl-decode-b
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`(1
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(loop
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(read r0 r1 r2 r3)
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(r4 = r0 ,mel-ccl-decode-b-0-table)
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(r5 = r1 ,mel-ccl-decode-b-1-table)
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(r4 |= r5)
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(r5 = r2 ,mel-ccl-decode-b-2-table)
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(r4 |= r5)
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(r5 = r3 ,mel-ccl-decode-b-3-table)
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(r4 |= r5)
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(if (r4 & ,(lognot (1- (lsh 1 24))))
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((loop
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(if (r4 & ,(lsh 1 24))
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((r0 = r1) (r1 = r2) (r2 = r3) (read r3)
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(r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
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(r5 = r3 ,mel-ccl-decode-b-3-table)
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(r4 |= r5)
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(repeat))
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(break)))
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(loop
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(if (r4 & ,(lsh 1 25))
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((r1 = r2) (r2 = r3) (read r3)
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(r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
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(r5 = r3 ,mel-ccl-decode-b-3-table)
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(r4 |= r5)
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(repeat))
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(break)))
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(loop
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(if (r2 != ?=)
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(if (r4 & ,(lsh 1 26))
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((r2 = r3) (read r3)
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(r4 >>= 1) (r4 &= ,(logior (lsh 7 24)))
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(r5 = r3 ,mel-ccl-decode-b-3-table)
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(r4 |= r5)
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(repeat))
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((r6 = 0)
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(break)))
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((r6 = 1)
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(break))))
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(loop
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(if (r3 != ?=)
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(if (r4 & ,(lsh 1 27))
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((read r3)
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(r4 = r3 ,mel-ccl-decode-b-3-table)
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(repeat))
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(break))
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((r6 |= 2)
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(break))))
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(r4 = r0 ,mel-ccl-decode-b-0-table)
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(r5 = r1 ,mel-ccl-decode-b-1-table)
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(r4 |= r5)
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(branch
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r6
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;; BBBB
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((r5 = r2 ,mel-ccl-decode-b-2-table)
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(r4 |= r5)
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(r5 = r3 ,mel-ccl-decode-b-3-table)
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(r4 |= r5)
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(r4 >8= 0)
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(write r7)
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(r4 >8= 0)
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(write r7)
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(write-repeat r4))
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;; error: BB=B
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((write (r4 & 255))
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(end))
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;; BBB=
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((r5 = r2 ,mel-ccl-decode-b-2-table)
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(r4 |= r5)
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(r4 >8= 0)
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(write r7)
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(write (r4 & 255))
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(end) ; Excessive (end) is workaround for XEmacs 21.0.
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; Without this, "AAA=" is converted to "^@^@^@".
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(end))
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;; BB==
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((write (r4 & 255))
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(end))))
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((r4 >8= 0)
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(write r7)
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(r4 >8= 0)
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(write r7)
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(write-repeat r4))))))
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)
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(eval-when-compile
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;; Generated CCL program works not properly on 20.2 because CCL_EOF_BLOCK
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;; is not executed.
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(defun mel-ccl-encode-base64-generic
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(&optional quantums-per-line output-crlf terminate-with-newline)
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`(2
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((r3 = 0)
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(r2 = 0)
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(read r1)
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(loop
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(branch
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r1
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,@(mapcar
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(lambda (r1)
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`((write ,(nth (lsh r1 -2) mel-ccl-64-to-256-table))
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(r0 = ,(logand r1 3))))
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mel-ccl-256-table))
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(r2 = 1)
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(read-branch
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r1
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,@(mapcar
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(lambda (r1)
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`((write r0 ,(vconcat
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(mapcar
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(lambda (r0)
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(nth (logior (lsh r0 4)
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(lsh r1 -4))
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mel-ccl-64-to-256-table))
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mel-ccl-4-table)))
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(r0 = ,(logand r1 15))))
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mel-ccl-256-table))
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(r2 = 2)
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(read-branch
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r1
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,@(mapcar
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(lambda (r1)
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`((write r0 ,(vconcat
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(mapcar
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(lambda (r0)
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(nth (logior (lsh r0 2)
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(lsh r1 -6))
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mel-ccl-64-to-256-table))
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mel-ccl-16-table)))))
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mel-ccl-256-table))
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(r1 &= 63)
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(write r1 ,(vconcat
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(mapcar
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(lambda (r1)
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(nth r1 mel-ccl-64-to-256-table))
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mel-ccl-64-table)))
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(r3 += 1)
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(r2 = 0)
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(read r1)
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,@(when quantums-per-line
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`((if (r3 == ,quantums-per-line)
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((write ,(if output-crlf "\r\n" "\n"))
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(r3 = 0)))))
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(repeat)))
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(branch
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r2
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,(if terminate-with-newline
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`(if (r3 > 0) (write ,(if output-crlf "\r\n" "\n")))
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`(r0 = 0))
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((write r0 ,(vconcat
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(mapcar
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(lambda (r0)
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(nth (lsh r0 4) mel-ccl-64-to-256-table))
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mel-ccl-4-table)))
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(write ,(if terminate-with-newline
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(if output-crlf "==\r\n" "==\n")
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"==")))
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((write r0 ,(vconcat
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(mapcar
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(lambda (r0)
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(nth (lsh r0 2) mel-ccl-64-to-256-table))
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mel-ccl-16-table)))
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(write ,(if terminate-with-newline
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(if output-crlf "=\r\n" "=\n")
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"="))))
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))
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)
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(define-ccl-program mel-ccl-encode-b
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(mel-ccl-encode-base64-generic))
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;; 19 * 4 = 76
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(define-ccl-program mel-ccl-encode-base64-crlf-crlf
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(mel-ccl-encode-base64-generic 19 t))
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(define-ccl-program mel-ccl-encode-base64-crlf-lf
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(mel-ccl-encode-base64-generic 19 nil))
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;;; @ coding system
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;;;
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(make-ccl-coding-system
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'mel-ccl-b-rev ?B "MIME B-encoding (reversed)"
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'mel-ccl-encode-b 'mel-ccl-decode-b)
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(make-ccl-coding-system
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'mel-ccl-base64-crlf-rev
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?B "MIME Base64-encoding (reversed)"
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'mel-ccl-encode-base64-crlf-crlf
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'mel-ccl-decode-b)
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(make-ccl-coding-system
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'mel-ccl-base64-lf-rev
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?B "MIME Base64-encoding (LF encoding) (reversed)"
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'mel-ccl-encode-base64-crlf-lf
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'mel-ccl-decode-b)
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;;; @ B
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;;;
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(check-broken-facility ccl-execute-eof-block-on-decoding-some)
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(unless-broken ccl-execute-eof-block-on-decoding-some
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(defun base64-ccl-encode-string (string &optional no-line-break)
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"Encode STRING with base64 encoding."
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(if no-line-break
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(decode-coding-string string 'mel-ccl-b-rev)
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(decode-coding-string string 'mel-ccl-base64-lf-rev)))
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(defalias-maybe 'base64-encode-string 'base64-ccl-encode-string)
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(defun base64-ccl-encode-region (start end &optional no-line-break)
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"Encode region from START to END with base64 encoding."
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(interactive "*r")
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(if no-line-break
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(decode-coding-region start end 'mel-ccl-b-rev)
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(decode-coding-region start end 'mel-ccl-base64-lf-rev)))
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(defalias-maybe 'base64-encode-region 'base64-ccl-encode-region)
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(defun base64-ccl-insert-encoded-file (filename)
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"Encode contents of file FILENAME to base64, and insert the result."
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(interactive "*fInsert encoded file: ")
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(insert
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(decode-coding-string
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(with-temp-buffer
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(set-buffer-multibyte nil)
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(insert-file-contents-as-binary filename)
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(buffer-string))
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'mel-ccl-base64-lf-rev)))
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(mel-define-method-function (mime-encode-string string (nil "base64"))
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'base64-ccl-encode-string)
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(mel-define-method-function (mime-encode-region start end (nil "base64"))
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'base64-ccl-encode-region)
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(mel-define-method-function
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(mime-insert-encoded-file filename (nil "base64"))
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'base64-ccl-insert-encoded-file)
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(mel-define-method-function (encoded-text-encode-string string (nil "B"))
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'base64-ccl-encode-string)
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)
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(defun base64-ccl-decode-string (string)
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"Decode base64 encoded STRING"
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(encode-coding-string string 'mel-ccl-b-rev))
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(defalias-maybe 'base64-decode-string 'base64-ccl-decode-string)
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(defun base64-ccl-decode-region (start end)
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"Decode base64 encoded the region from START to END."
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(interactive "*r")
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(encode-coding-region start end 'mel-ccl-b-rev))
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(defalias-maybe 'base64-decode-region 'base64-ccl-decode-region)
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(defun base64-ccl-write-decoded-region (start end filename)
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"Decode the region from START to END and write out to FILENAME."
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(interactive "*r\nFWrite decoded region to file: ")
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(let ((coding-system-for-write 'mel-ccl-b-rev)
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jka-compr-compression-info-list jam-zcat-filename-list)
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(write-region start end filename)))
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(mel-define-method-function (mime-decode-string string (nil "base64"))
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'base64-ccl-decode-string)
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(mel-define-method-function (mime-decode-region start end (nil "base64"))
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'base64-ccl-decode-region)
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(mel-define-method-function
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(mime-write-decoded-region start end filename (nil "base64"))
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'base64-ccl-write-decoded-region)
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(mel-define-method encoded-text-decode-string (string (nil "B"))
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(if (string-match (eval-when-compile
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(concat "\\`" B-encoded-text-regexp "\\'"))
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string)
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(base64-ccl-decode-string string)
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(error "Invalid encoded-text %s" string)))
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;;; @ end
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;;;
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(provide 'mel-b-ccl)
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;;; mel-b-ccl.el ends here.
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