Function SwapBase64

src/i2p.cpp:37–61

* Swap Standard Base64 <-> I2P Base64. * Standard Base64 uses `+` and `/` as last two characters of its alphabet. * I2P Base64 uses `-` and `~` respectively. * So it is easy to detect in which one is the input and convert to the other. * @param[in] from Input to convert. * @return converted `from` */

 * @return converted `from`
 */
static std::string SwapBase64(const std::string& from)
{
    std::string to;
    to.resize(from.size());
    for (size_t i = 0; i < from.size(); ++i) {
        switch (from[i]) {
        case '-':
            to[i] = '+';
            break;
        case '~':
            to[i] = '/';
            break;
        case '+':
            to[i] = '-';
            break;
        case '/':
            to[i] = '~';
            break;
        default:
            to[i] = from[i];
            break;
        }
    }
    return to;
}

/**
 * Decode an I2P-style Base64 string.