42   char *Frame() const { return buffer_ + start_ + frame_; }  in Frame()
44     return std::min<std::size_t>(length_ - frame_, size_ - (start_ + frame_));  in FrameLength()
46   std::size_t BytesBufferedBeforeFrame() const { return frame_ - start_; }  in BytesBufferedBeforeFrame()
57     if (static_cast<std::int64_t>(start_ + frame_ + bytes) > size_) {  in ReadFrame()
59       if (static_cast<std::int64_t>(start_ + bytes) > size_) {  in ReadFrame()
63         if (start_ + length_ <= size_) {  in ReadFrame()
65           std::memmove(buffer_, buffer_ + start_, length_);  in ReadFrame()
68           auto n{start_ + length_ - size_}; // 3 for cde  in ReadFrame()
70           std::memmove(buffer_ + n, buffer_ + start_, length_ - n); // cdeab  in ReadFrame()
73         start_ = 0;  in ReadFrame()
77       auto next{start_ + length_};  in ReadFrame()
94         start_ + (at - fileOffset_) + static_cast<std::int64_t>(bytes) >  in WriteFrame()
108         std::size_t chunk{std::min<std::size_t>(length_, size_ - start_)};  in Flush()
110             Store().Write(fileOffset_, buffer_ + start_, chunk, handler)};  in Flush()
112         start_ += put;  in Flush()
132       auto chunk{std::min<std::int64_t>(length_, oldSize - start_)};  in Reallocate()
133       std::memcpy(buffer_, old + start_, chunk);  in Reallocate()
134       start_ = 0;  in Reallocate()
141     start_ = length_ = frame_ = 0;  in Reset()
150       start_ = 0;  in DiscardLeadingBytes()
152       start_ += n;  in DiscardLeadingBytes()
153       if (start_ >= size_) {  in DiscardLeadingBytes()
154         start_ -= size_;  in DiscardLeadingBytes()
170   std::int64_t start_{0}; // buffer_[] offset of valid data