| 161 | } |
| 162 | |
| 163 | std::optional<std::vector<unsigned char>> DecodeBase32(std::string_view str) |
| 164 | { |
| 165 | static const int8_t decode32_table[256]{ |
| 166 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 167 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 168 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, |
| 169 | -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 170 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 0, 1, 2, |
| 171 | 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, |
| 172 | 23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 173 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 174 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 175 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 176 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 177 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 178 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 |
| 179 | }; |
| 180 | |
| 181 | if (str.size() % 8 != 0) return {}; |
| 182 | /* 1, 3, 4, or 6 padding '=' suffix characters are permitted. */ |
| 183 | if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1); |
| 184 | if (str.size() >= 2 && str.substr(str.size() - 2) == "==") str.remove_suffix(2); |
| 185 | if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1); |
| 186 | if (str.size() >= 2 && str.substr(str.size() - 2) == "==") str.remove_suffix(2); |
| 187 | |
| 188 | std::vector<unsigned char> ret; |
| 189 | ret.reserve((str.size() * 5) / 8); |
| 190 | bool valid = ConvertBits<5, 8, false>( |
| 191 | [&](unsigned char c) { ret.push_back(c); }, |
| 192 | str.begin(), str.end(), |
| 193 | [](char c) { return decode32_table[uint8_t(c)]; } |
| 194 | ); |
| 195 | |
| 196 | if (!valid) return {}; |
| 197 | |
| 198 | return ret; |
| 199 | } |
| 200 | |
| 201 | std::string FormatParagraph(std::string_view in, size_t width, size_t indent) |
| 202 | { |