inline void printHex(const uint8_t* s, unsigned size)
{
    for (unsigned i = 0; i != size; ++i)
    {
        if (s[i] > ' ' && s[i] <= '~')
        {
            printf("'%c' %02x ", s[i], (int)s[i]);
        }
        else
        {
            printf("    %02x ", (int)s[i]);
        }
    }
    printf("\n");
}

inline void printHex(const std::stringstream& ss)
{
    auto s = ss.str();
    printHex((const uint8_t*)s.c_str(), s.size());
}