Method digest

src/brpc/policy/rtmp_protocol.cpp:247–247

    const void* random1() const { return _buf + _offset + DIGEST_SIZE; }
    int random1_size() const { return SIZE - DIGEST_SIZE - 4 - _offset; }
    const void* digest() const { return _buf + _offset; }
    void* digest() { return _buf + _offset; }

private: