Method RefreshBlock

library/cpp/yson/detail.h:779–784

        }

        void RefreshBlock() {
            size_t bytes = Stream->Read(Buffer, BufferSize);
            BeginPtr = Buffer;
            EndPtr = Buffer + bytes;
            FinishFlag = (bytes == 0);
        }

        void Advance(size_t bytes) {
            BeginPtr += bytes;