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18 |
| package org.apache.geronimo.mail.util; |
19 |
| |
20 |
| import java.io.IOException; |
21 |
| import java.io.InputStream; |
22 |
| import java.io.OutputStream; |
23 |
| import java.io.PrintStream; |
24 |
| |
25 |
| public class Base64Encoder |
26 |
| implements Encoder |
27 |
| { |
28 |
| protected final byte[] encodingTable = |
29 |
| { |
30 |
| (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G', |
31 |
| (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', |
32 |
| (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U', |
33 |
| (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z', |
34 |
| (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g', |
35 |
| (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n', |
36 |
| (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u', |
37 |
| (byte)'v', |
38 |
| (byte)'w', (byte)'x', (byte)'y', (byte)'z', |
39 |
| (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', |
40 |
| (byte)'7', (byte)'8', (byte)'9', |
41 |
| (byte)'+', (byte)'/' |
42 |
| }; |
43 |
| |
44 |
| protected byte padding = (byte)'='; |
45 |
| |
46 |
| |
47 |
| |
48 |
| |
49 |
| protected final byte[] decodingTable = new byte[256]; |
50 |
| |
51 |
11
| protected void initialiseDecodingTable()
|
52 |
| { |
53 |
11
| for (int i = 0; i < encodingTable.length; i++)
|
54 |
| { |
55 |
704
| decodingTable[encodingTable[i]] = (byte)i;
|
56 |
| } |
57 |
| } |
58 |
| |
59 |
11
| public Base64Encoder()
|
60 |
| { |
61 |
11
| initialiseDecodingTable();
|
62 |
| } |
63 |
| |
64 |
| |
65 |
| |
66 |
| |
67 |
| |
68 |
| |
69 |
42
| public int encode(
|
70 |
| byte[] data, |
71 |
| int off, |
72 |
| int length, |
73 |
| OutputStream out) |
74 |
| throws IOException |
75 |
| { |
76 |
42
| int modulus = length % 3;
|
77 |
42
| int dataLength = (length - modulus);
|
78 |
42
| int a1, a2, a3;
|
79 |
| |
80 |
42
| for (int i = off; i < off + dataLength; i += 3)
|
81 |
| { |
82 |
256
| a1 = data[i] & 0xff;
|
83 |
256
| a2 = data[i + 1] & 0xff;
|
84 |
256
| a3 = data[i + 2] & 0xff;
|
85 |
| |
86 |
256
| out.write(encodingTable[(a1 >>> 2) & 0x3f]);
|
87 |
256
| out.write(encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f]);
|
88 |
256
| out.write(encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f]);
|
89 |
256
| out.write(encodingTable[a3 & 0x3f]);
|
90 |
| } |
91 |
| |
92 |
| |
93 |
| |
94 |
| |
95 |
42
| int b1, b2, b3;
|
96 |
42
| int d1, d2;
|
97 |
| |
98 |
42
| switch (modulus)
|
99 |
| { |
100 |
40
| case 0:
|
101 |
40
| break;
|
102 |
1
| case 1:
|
103 |
1
| d1 = data[off + dataLength] & 0xff;
|
104 |
1
| b1 = (d1 >>> 2) & 0x3f;
|
105 |
1
| b2 = (d1 << 4) & 0x3f;
|
106 |
| |
107 |
1
| out.write(encodingTable[b1]);
|
108 |
1
| out.write(encodingTable[b2]);
|
109 |
1
| out.write(padding);
|
110 |
1
| out.write(padding);
|
111 |
1
| break;
|
112 |
1
| case 2:
|
113 |
1
| d1 = data[off + dataLength] & 0xff;
|
114 |
1
| d2 = data[off + dataLength + 1] & 0xff;
|
115 |
| |
116 |
1
| b1 = (d1 >>> 2) & 0x3f;
|
117 |
1
| b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
|
118 |
1
| b3 = (d2 << 2) & 0x3f;
|
119 |
| |
120 |
1
| out.write(encodingTable[b1]);
|
121 |
1
| out.write(encodingTable[b2]);
|
122 |
1
| out.write(encodingTable[b3]);
|
123 |
1
| out.write(padding);
|
124 |
1
| break;
|
125 |
| } |
126 |
| |
127 |
42
| return (dataLength / 3) * 4 + ((modulus == 0) ? 0 : 4);
|
128 |
| } |
129 |
| |
130 |
1062
| private boolean ignore(
|
131 |
| char c) |
132 |
| { |
133 |
1062
| return (c == '\n' || c =='\r' || c == '\t' || c == ' ');
|
134 |
| } |
135 |
| |
136 |
| |
137 |
| |
138 |
| |
139 |
| |
140 |
| |
141 |
| |
142 |
2
| public int decode(
|
143 |
| byte[] data, |
144 |
| int off, |
145 |
| int length, |
146 |
| OutputStream out) |
147 |
| throws IOException |
148 |
| { |
149 |
2
| byte[] bytes;
|
150 |
2
| byte b1, b2, b3, b4;
|
151 |
2
| int outLen = 0;
|
152 |
| |
153 |
2
| int end = off + length;
|
154 |
| |
155 |
2
| while (end > 0)
|
156 |
| { |
157 |
2
| if (!ignore((char)data[end - 1]))
|
158 |
| { |
159 |
2
| break;
|
160 |
| } |
161 |
| |
162 |
0
| end--;
|
163 |
| } |
164 |
| |
165 |
2
| int i = off;
|
166 |
2
| int finish = end - 4;
|
167 |
| |
168 |
2
| while (i < finish)
|
169 |
| { |
170 |
10
| while ((i < finish) && ignore((char)data[i]))
|
171 |
| { |
172 |
0
| i++;
|
173 |
| } |
174 |
| |
175 |
10
| b1 = decodingTable[data[i++]];
|
176 |
| |
177 |
10
| while ((i < finish) && ignore((char)data[i]))
|
178 |
| { |
179 |
0
| i++;
|
180 |
| } |
181 |
| |
182 |
10
| b2 = decodingTable[data[i++]];
|
183 |
| |
184 |
10
| while ((i < finish) && ignore((char)data[i]))
|
185 |
| { |
186 |
0
| i++;
|
187 |
| } |
188 |
| |
189 |
10
| b3 = decodingTable[data[i++]];
|
190 |
| |
191 |
10
| while ((i < finish) && ignore((char)data[i]))
|
192 |
| { |
193 |
0
| i++;
|
194 |
| } |
195 |
| |
196 |
10
| b4 = decodingTable[data[i++]];
|
197 |
| |
198 |
10
| out.write((b1 << 2) | (b2 >> 4));
|
199 |
10
| out.write((b2 << 4) | (b3 >> 2));
|
200 |
10
| out.write((b3 << 6) | b4);
|
201 |
| |
202 |
10
| outLen += 3;
|
203 |
| } |
204 |
| |
205 |
2
| if (data[end - 2] == padding)
|
206 |
| { |
207 |
0
| b1 = decodingTable[data[end - 4]];
|
208 |
0
| b2 = decodingTable[data[end - 3]];
|
209 |
| |
210 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
211 |
| |
212 |
0
| outLen += 1;
|
213 |
| } |
214 |
2
| else if (data[end - 1] == padding)
|
215 |
| { |
216 |
2
| b1 = decodingTable[data[end - 4]];
|
217 |
2
| b2 = decodingTable[data[end - 3]];
|
218 |
2
| b3 = decodingTable[data[end - 2]];
|
219 |
| |
220 |
2
| out.write((b1 << 2) | (b2 >> 4));
|
221 |
2
| out.write((b2 << 4) | (b3 >> 2));
|
222 |
| |
223 |
2
| outLen += 2;
|
224 |
| } |
225 |
| else |
226 |
| { |
227 |
0
| b1 = decodingTable[data[end - 4]];
|
228 |
0
| b2 = decodingTable[data[end - 3]];
|
229 |
0
| b3 = decodingTable[data[end - 2]];
|
230 |
0
| b4 = decodingTable[data[end - 1]];
|
231 |
| |
232 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
233 |
0
| out.write((b2 << 4) | (b3 >> 2));
|
234 |
0
| out.write((b3 << 6) | b4);
|
235 |
| |
236 |
0
| outLen += 3;
|
237 |
| } |
238 |
| |
239 |
2
| return outLen;
|
240 |
| } |
241 |
| |
242 |
| |
243 |
| |
244 |
| |
245 |
| |
246 |
| |
247 |
| |
248 |
0
| public int decode(
|
249 |
| String data, |
250 |
| OutputStream out) |
251 |
| throws IOException |
252 |
| { |
253 |
0
| byte[] bytes;
|
254 |
0
| byte b1, b2, b3, b4;
|
255 |
0
| int length = 0;
|
256 |
| |
257 |
0
| int end = data.length();
|
258 |
| |
259 |
0
| while (end > 0)
|
260 |
| { |
261 |
0
| if (!ignore(data.charAt(end - 1)))
|
262 |
| { |
263 |
0
| break;
|
264 |
| } |
265 |
| |
266 |
0
| end--;
|
267 |
| } |
268 |
| |
269 |
0
| int i = 0;
|
270 |
0
| int finish = end - 4;
|
271 |
| |
272 |
0
| while (i < finish)
|
273 |
| { |
274 |
0
| while ((i < finish) && ignore(data.charAt(i)))
|
275 |
| { |
276 |
0
| i++;
|
277 |
| } |
278 |
| |
279 |
0
| b1 = decodingTable[data.charAt(i++)];
|
280 |
| |
281 |
0
| while ((i < finish) && ignore(data.charAt(i)))
|
282 |
| { |
283 |
0
| i++;
|
284 |
| } |
285 |
0
| b2 = decodingTable[data.charAt(i++)];
|
286 |
| |
287 |
0
| while ((i < finish) && ignore(data.charAt(i)))
|
288 |
| { |
289 |
0
| i++;
|
290 |
| } |
291 |
0
| b3 = decodingTable[data.charAt(i++)];
|
292 |
| |
293 |
0
| while ((i < finish) && ignore(data.charAt(i)))
|
294 |
| { |
295 |
0
| i++;
|
296 |
| } |
297 |
0
| b4 = decodingTable[data.charAt(i++)];
|
298 |
| |
299 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
300 |
0
| out.write((b2 << 4) | (b3 >> 2));
|
301 |
0
| out.write((b3 << 6) | b4);
|
302 |
| |
303 |
0
| length += 3;
|
304 |
| } |
305 |
| |
306 |
0
| if (data.charAt(end - 2) == padding)
|
307 |
| { |
308 |
0
| b1 = decodingTable[data.charAt(end - 4)];
|
309 |
0
| b2 = decodingTable[data.charAt(end - 3)];
|
310 |
| |
311 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
312 |
| |
313 |
0
| length += 1;
|
314 |
| } |
315 |
0
| else if (data.charAt(end - 1) == padding)
|
316 |
| { |
317 |
0
| b1 = decodingTable[data.charAt(end - 4)];
|
318 |
0
| b2 = decodingTable[data.charAt(end - 3)];
|
319 |
0
| b3 = decodingTable[data.charAt(end - 2)];
|
320 |
| |
321 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
322 |
0
| out.write((b2 << 4) | (b3 >> 2));
|
323 |
| |
324 |
0
| length += 2;
|
325 |
| } |
326 |
| else |
327 |
| { |
328 |
0
| b1 = decodingTable[data.charAt(end - 4)];
|
329 |
0
| b2 = decodingTable[data.charAt(end - 3)];
|
330 |
0
| b3 = decodingTable[data.charAt(end - 2)];
|
331 |
0
| b4 = decodingTable[data.charAt(end - 1)];
|
332 |
| |
333 |
0
| out.write((b1 << 2) | (b2 >> 4));
|
334 |
0
| out.write((b2 << 4) | (b3 >> 2));
|
335 |
0
| out.write((b3 << 6) | b4);
|
336 |
| |
337 |
0
| length += 3;
|
338 |
| } |
339 |
| |
340 |
0
| return length;
|
341 |
| } |
342 |
| |
343 |
| |
344 |
| |
345 |
| |
346 |
| |
347 |
| |
348 |
4
| public int decode(byte[] data, int off, int length, byte[] out) throws IOException
|
349 |
| { |
350 |
4
| byte[] bytes;
|
351 |
4
| byte b1, b2, b3, b4;
|
352 |
4
| int outLen = 0;
|
353 |
| |
354 |
4
| int end = off + length;
|
355 |
| |
356 |
4
| while (end > 0)
|
357 |
| { |
358 |
4
| if (!ignore((char)data[end - 1]))
|
359 |
| { |
360 |
4
| break;
|
361 |
| } |
362 |
| |
363 |
0
| end--;
|
364 |
| } |
365 |
| |
366 |
4
| int i = off;
|
367 |
4
| int finish = end - 4;
|
368 |
| |
369 |
4
| while (i < finish)
|
370 |
| { |
371 |
254
| while ((i < finish) && ignore((char)data[i]))
|
372 |
| { |
373 |
0
| i++;
|
374 |
| } |
375 |
| |
376 |
254
| b1 = decodingTable[data[i++]];
|
377 |
| |
378 |
254
| while ((i < finish) && ignore((char)data[i]))
|
379 |
| { |
380 |
0
| i++;
|
381 |
| } |
382 |
| |
383 |
254
| b2 = decodingTable[data[i++]];
|
384 |
| |
385 |
254
| while ((i < finish) && ignore((char)data[i]))
|
386 |
| { |
387 |
0
| i++;
|
388 |
| } |
389 |
| |
390 |
254
| b3 = decodingTable[data[i++]];
|
391 |
| |
392 |
254
| while ((i < finish) && ignore((char)data[i]))
|
393 |
| { |
394 |
0
| i++;
|
395 |
| } |
396 |
| |
397 |
254
| b4 = decodingTable[data[i++]];
|
398 |
| |
399 |
254
| out[outLen++] = (byte)((b1 << 2) | (b2 >> 4));
|
400 |
254
| out[outLen++] = (byte)((b2 << 4) | (b3 >> 2));
|
401 |
254
| out[outLen++] = (byte)((b3 << 6) | b4);
|
402 |
| } |
403 |
| |
404 |
4
| if (data[end - 2] == padding)
|
405 |
| { |
406 |
1
| b1 = decodingTable[data[end - 4]];
|
407 |
1
| b2 = decodingTable[data[end - 3]];
|
408 |
| |
409 |
1
| out[outLen++] = (byte)((b1 << 2) | (b2 >> 4));
|
410 |
| } |
411 |
3
| else if (data[end - 1] == padding)
|
412 |
| { |
413 |
1
| b1 = decodingTable[data[end - 4]];
|
414 |
1
| b2 = decodingTable[data[end - 3]];
|
415 |
1
| b3 = decodingTable[data[end - 2]];
|
416 |
| |
417 |
1
| out[outLen++] = (byte)((b1 << 2) | (b2 >> 4));
|
418 |
1
| out[outLen++] = (byte)((b2 << 4) | (b3 >> 2));
|
419 |
| } |
420 |
| else |
421 |
| { |
422 |
2
| b1 = decodingTable[data[end - 4]];
|
423 |
2
| b2 = decodingTable[data[end - 3]];
|
424 |
2
| b3 = decodingTable[data[end - 2]];
|
425 |
2
| b4 = decodingTable[data[end - 1]];
|
426 |
| |
427 |
2
| out[outLen++] = (byte)((b1 << 2) | (b2 >> 4));
|
428 |
2
| out[outLen++] = (byte)((b2 << 4) | (b3 >> 2));
|
429 |
2
| out[outLen++] = (byte)((b3 << 6) | b4);
|
430 |
| } |
431 |
| |
432 |
4
| return outLen;
|
433 |
| } |
434 |
| |
435 |
| |
436 |
| |
437 |
| |
438 |
| |
439 |
| |
440 |
| |
441 |
| |
442 |
| |
443 |
1056
| public boolean isValidBase64(int ch) {
|
444 |
| |
445 |
1056
| return ch == padding || ch == 'A' || decodingTable[ch] != 0;
|
446 |
| } |
447 |
| |
448 |
| |
449 |
| |
450 |
| |
451 |
| |
452 |
| |
453 |
| |
454 |
| |
455 |
| |
456 |
| |
457 |
| |
458 |
| |
459 |
| |
460 |
2
| public void encodeWord(InputStream in, String charset, OutputStream out, boolean fold) throws IOException
|
461 |
| { |
462 |
2
| PrintStream writer = new PrintStream(out);
|
463 |
| |
464 |
| |
465 |
2
| int limit = 76 - 7 - charset.length();
|
466 |
2
| boolean firstLine = true;
|
467 |
2
| StringBuffer encodedString = new StringBuffer(76);
|
468 |
| |
469 |
2
| while (true) {
|
470 |
| |
471 |
4
| encode(in, encodedString, limit);
|
472 |
| |
473 |
4
| if (encodedString.length() == 0) {
|
474 |
2
| break;
|
475 |
| } |
476 |
| |
477 |
| |
478 |
| |
479 |
2
| if (!firstLine) {
|
480 |
0
| if (fold) {
|
481 |
0
| writer.print("\r\n");
|
482 |
| } |
483 |
| else { |
484 |
0
| writer.print(" ");
|
485 |
| } |
486 |
| } |
487 |
| |
488 |
| |
489 |
2
| writer.print("=?");
|
490 |
2
| writer.print(charset);
|
491 |
2
| writer.print("?B?");
|
492 |
| |
493 |
2
| writer.print(encodedString.toString());
|
494 |
| |
495 |
2
| writer.print("?=");
|
496 |
2
| writer.flush();
|
497 |
| |
498 |
| |
499 |
2
| encodedString.setLength(0);
|
500 |
| } |
501 |
| } |
502 |
| |
503 |
| |
504 |
| |
505 |
| |
506 |
| |
507 |
| |
508 |
4
| public void encode(InputStream in, StringBuffer out, int limit) throws IOException
|
509 |
| { |
510 |
4
| int count = limit / 4;
|
511 |
4
| byte [] inBuffer = new byte[3];
|
512 |
| |
513 |
14
| while (count-- > 0) {
|
514 |
| |
515 |
14
| int readCount = in.read(inBuffer);
|
516 |
| |
517 |
14
| if (readCount == 3) {
|
518 |
10
| int a1 = inBuffer[0] & 0xff;
|
519 |
10
| int a2 = inBuffer[1] & 0xff;
|
520 |
10
| int a3 = inBuffer[2] & 0xff;
|
521 |
| |
522 |
10
| out.append((char)encodingTable[(a1 >>> 2) & 0x3f]);
|
523 |
10
| out.append((char)encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f]);
|
524 |
10
| out.append((char)encodingTable[((a2 << 2) | (a3 >>> 6)) & 0x3f]);
|
525 |
10
| out.append((char)encodingTable[a3 & 0x3f]);
|
526 |
| |
527 |
| } |
528 |
4
| else if (readCount <= 0) {
|
529 |
| |
530 |
2
| return;
|
531 |
| } |
532 |
2
| else if (readCount == 1) {
|
533 |
0
| int a1 = inBuffer[0] & 0xff;
|
534 |
0
| out.append((char)encodingTable[(a1 >>> 2) & 0x3f]);
|
535 |
0
| out.append((char)encodingTable[(a1 << 4) & 0x3f]);
|
536 |
0
| out.append((char)padding);
|
537 |
0
| out.append((char)padding);
|
538 |
0
| return;
|
539 |
| } |
540 |
2
| else if (readCount == 2) {
|
541 |
2
| int a1 = inBuffer[0] & 0xff;
|
542 |
2
| int a2 = inBuffer[1] & 0xff;
|
543 |
| |
544 |
2
| out.append((char)encodingTable[(a1 >>> 2) & 0x3f]);
|
545 |
2
| out.append((char)encodingTable[((a1 << 4) | (a2 >>> 4)) & 0x3f]);
|
546 |
2
| out.append((char)encodingTable[(a2 << 2) & 0x3f]);
|
547 |
2
| out.append((char)padding);
|
548 |
2
| return;
|
549 |
| } |
550 |
| } |
551 |
| } |
552 |
| } |