Function CheckCharacters

src/bech32.cpp:287–309

Return indices of invalid characters in a Bech32 string. */

/** Return indices of invalid characters in a Bech32 string. */
bool CheckCharacters(const std::string& str, std::vector<int>& errors)
{
    bool lower = false, upper = false;
    for (size_t i = 0; i < str.size(); ++i) {
        unsigned char c{(unsigned char)(str[i])};
        if (c >= 'a' && c <= 'z') {
            if (upper) {
                errors.push_back(i);
            } else {
                lower = true;
            }
        } else if (c >= 'A' && c <= 'Z') {
            if (lower) {
                errors.push_back(i);
            } else {
                upper = true;
            }
        } else if (c < 33 || c > 126) {
            errors.push_back(i);
        }
    }
    return errors.empty();
}

std::vector<unsigned char> PreparePolynomialCoefficients(const std::string& hrp, const data& values)
{