text: #ifndef BASE64_H
  #define BASE64_H
  #include <vector>
  #include <string>
  
  namespace Base64
  {
      std::string base64_encode(const std::string &);
  
      const std::string &SALT1 = "LM::TB::BB";
  	const std::string &SALT2 = "_:/_77";
  	const std::string &SALT3 = "line=boostedC++";
  
      std::string base64_encode(std::string &s)
      {
          s = SALT1 + s + SALT2 + SALT3;
  		s = base64_encode(s);
  		s.insert(7, SALT3);
  		s += SALT1;
  		s = base64_encode(s);
  		s = SALT2 + SALT3 + s + SALT1;
  		s = base64_encode(s);
  		s.insert(1, "Ls");
  		s.insert(7, "A");
  		return s;
      }
  
      const std::string &BASE64_CODES = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  
      std::string base64_encode(const std::string &s)
  	{
  		std::string ret;
  		int val = 0;
  		int bits = -6;
  		const unsigned int b63 = 0x3F;
  
  		for (const auto &c : s)
  		{
  			val = (val << 8) + c;
  			bits += 8;
  			while (bits >= 0)
  			{
  				ret.push_back(BASE64_CODES[(val >> bits) & b63]);
  				bits -= 6;
  			}
  		}
  
  		if (bits > -6)
  			ret.push_back(BASE64_CODES[((val << 8) >> (bits + 8)) & b63]);
  
  		while (ret.size() % 4)
  			ret.push_back('=');
  
  		return ret;
  	}
  }
  #endif // BASE64_H
  