Method CreateI2NPBlock

libi2pd/SSU2Session.cpp:3043–3053

	}

	size_t SSU2Session::CreateI2NPBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage>&& msg)
	{
		msg->ToNTCP2 ();
		auto msgBuf = msg->GetNTCP2Header ();
		auto msgLen = msg->GetNTCP2Length ();
		if (msgLen + 3 > len) msgLen = len - 3;
		buf[0] = eSSU2BlkI2NPMessage;
		htobe16buf (buf + 1, msgLen); // size
		memcpy (buf + 3, msgBuf, msgLen);
		return msgLen + 3;
	}

	size_t SSU2Session::CreateFirstFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg)
	{