59   char *Frame() const { return buffer_ + start_ + frame_; }  in Frame()
61     return std::min<std::size_t>(length_ - frame_, size_ - (start_ + frame_));  in FrameLength()
63   std::size_t BytesBufferedBeforeFrame() const { return frame_ - start_; }  in BytesBufferedBeforeFrame()
77     if (static_cast<std::int64_t>(start_ + frame_ + bytes) > size_) {  in ReadFrame()
83       auto next{start_ + length_};  in ReadFrame()
101     } else if (start_ + newFrame + static_cast<std::int64_t>(bytes) > size_) {  in WriteFrame()
117             std::min<std::size_t>(length_ - keep, size_ - start_)};
119             Store().Write(fileOffset_, buffer_ + start_, chunk, handler)};
150       auto chunk{std::min<std::int64_t>(length_, oldSize - start_)};  in Reallocate()
151       std::memcpy(buffer_, old + start_, chunk);  in Reallocate()
152       start_ = 0;  in Reallocate()
159     start_ = length_ = frame_ = 0;  in Reset()
168       start_ = 0;  in DiscardLeadingBytes()
170       start_ += n;  in DiscardLeadingBytes()
171       if (start_ >= size_) {  in DiscardLeadingBytes()
172         start_ -= size_;  in DiscardLeadingBytes()
184     if (static_cast<std::int64_t>(start_ + bytes) > size_) {  in MakeDataContiguous()
188       if (start_ + length_ <= size_) {  in MakeDataContiguous()
190         std::memmove(buffer_, buffer_ + start_, length_);  in MakeDataContiguous()
193         auto n{start_ + length_ - size_}; // 3 for cde  in MakeDataContiguous()
195         std::memmove(buffer_ + n, buffer_ + start_, length_ - n); // cdeab  in MakeDataContiguous()
198       start_ = 0;  in MakeDataContiguous()
205   std::int64_t start_{0}; // buffer_[] offset of valid data