| 218 | } |
| 219 | |
| 220 | std::vector<unsigned char> DecodeBase32(const char* p, bool* pf_invalid) |
| 221 | { |
| 222 | static const int8_t decode32_table[256]{ |
| 223 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 224 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 225 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, |
| 226 | -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 227 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 0, 1, 2, |
| 228 | 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, |
| 229 | 23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 230 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 231 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 232 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 233 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 234 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 235 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 |
| 236 | }; |
| 237 | |
| 238 | const char* e = p; |
| 239 | std::vector<uint8_t> val; |
| 240 | val.reserve(strlen(p)); |
| 241 | while (*p != 0) { |
| 242 | int x = decode32_table[(unsigned char)*p]; |
| 243 | if (x == -1) break; |
| 244 | val.push_back(uint8_t(x)); |
| 245 | ++p; |
| 246 | } |
| 247 | |
| 248 | std::vector<unsigned char> ret; |
| 249 | ret.reserve((val.size() * 5) / 8); |
| 250 | bool valid = ConvertBits<5, 8, false>([&](unsigned char c) { ret.push_back(c); }, val.begin(), val.end()); |
| 251 | |
| 252 | const char* q = p; |
| 253 | while (valid && *p != 0) { |
| 254 | if (*p != '=') { |
| 255 | valid = false; |
| 256 | break; |
| 257 | } |
| 258 | ++p; |
| 259 | } |
| 260 | valid = valid && (p - e) % 8 == 0 && p - q < 8; |
| 261 | if (pf_invalid) *pf_invalid = !valid; |
| 262 | |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | std::string DecodeBase32(const std::string& str, bool* pf_invalid) |
| 267 | { |