Function base64

src/ifcparse/IfcGlobalId.cpp:36–49

Converts an unsigned integer into a base64 string of length l

// Converts an unsigned integer into a base64 string of length l
std::string base64(unsigned value, int length) {
    const int BASE64 = 64;
    std::string result;
    result.reserve(length);
    while (value != 0U) {
        result.push_back(chars[value % BASE64]);
        value /= BASE64;
    }
    while ((int)result.size() != length) {
        result.push_back('0');
    }
    std::reverse(result.begin(), result.end());
    return result;
}

// Converts a base64 string into an unsigned integer
unsigned from_base64(const std::string& string) {