| 346 | } |
| 347 | |
| 348 | vector<unsigned char> DecodeBase32(const char* p, bool* pfInvalid) |
| 349 | { |
| 350 | static const int decode32_table[256] = |
| 351 | { |
| 352 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 353 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 354 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, |
| 355 | -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 356 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 0, 1, 2, |
| 357 | 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, |
| 358 | 23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 359 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 360 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 361 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 362 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 363 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 364 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}; |
| 365 | |
| 366 | if (pfInvalid) |
| 367 | *pfInvalid = false; |
| 368 | |
| 369 | vector<unsigned char> vchRet; |
| 370 | vchRet.reserve((strlen(p)) * 5 / 8); |
| 371 | |
| 372 | int mode = 0; |
| 373 | int left = 0; |
| 374 | |
| 375 | while (1) { |
| 376 | int dec = decode32_table[(unsigned char)*p]; |
| 377 | if (dec == -1) break; |
| 378 | p++; |
| 379 | switch (mode) { |
| 380 | case 0: // we have no bits and get 5 |
| 381 | left = dec; |
| 382 | mode = 1; |
| 383 | break; |
| 384 | |
| 385 | case 1: // we have 5 bits and keep 2 |
| 386 | vchRet.push_back((left << 3) | (dec >> 2)); |
| 387 | left = dec & 3; |
| 388 | mode = 2; |
| 389 | break; |
| 390 | |
| 391 | case 2: // we have 2 bits and keep 7 |
| 392 | left = left << 5 | dec; |
| 393 | mode = 3; |
| 394 | break; |
| 395 | |
| 396 | case 3: // we have 7 bits and keep 4 |
| 397 | vchRet.push_back((left << 1) | (dec >> 4)); |
| 398 | left = dec & 15; |
| 399 | mode = 4; |
| 400 | break; |
| 401 | |
| 402 | case 4: // we have 4 bits, and keep 1 |
| 403 | vchRet.push_back((left << 4) | (dec >> 1)); |
| 404 | left = dec & 1; |
| 405 | mode = 5; |