61     return std::min<std::size_t>(length_ - frame_, size_ - (start_ + frame_));  in FrameLength()
71     if (newFrame < 0 || newFrame > length_) {  in ReadFrame()
83       auto next{start_ + length_};  in ReadFrame()
88           fileOffset_ + length_, buffer_ + next, minBytes, maxBytes, handler)};  in ReadFrame()
89       length_ += got;  in ReadFrame()
90       RUNTIME_CHECK(handler, length_ <= size_);  in ReadFrame()
98     if (!dirty_ || newFrame < 0 || newFrame > length_) {  in WriteFrame()
103       Flush(handler, length_ - newFrame);  in WriteFrame()
110     length_ = std::max<std::int64_t>(length_, frame_ + bytes);  in WriteFrame()
115       while (length_ > keep) {
117             std::min<std::size_t>(length_ - keep, size_ - start_)};
125       if (length_ == 0) {
135     } else if (at < fileOffset_ + length_) {  in TruncateFrame()
136       length_ = at - fileOffset_;  in TruncateFrame()
150       auto chunk{std::min<std::int64_t>(length_, oldSize - start_)};  in Reallocate()
153       std::memcpy(buffer_ + chunk, old, length_ - chunk);  in Reallocate()
159     start_ = length_ = frame_ = 0;  in Reset()
165     RUNTIME_CHECK(terminator, length_ >= n);  in DiscardLeadingBytes()
166     length_ -= n;  in DiscardLeadingBytes()
167     if (length_ == 0) {  in DiscardLeadingBytes()
187       RUNTIME_CHECK(handler, length_ < 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()
194         RUNTIME_CHECK(handler, length_ >= n);  in MakeDataContiguous()
195         std::memmove(buffer_ + n, buffer_ + start_, length_ - n); // cdeab  in MakeDataContiguous()
196         LeftShiftBufferCircularly(buffer_, length_, n); // abcde  in MakeDataContiguous()
206   std::int64_t length_{0}; // valid data length (can wrap)