SpaceLeft
size_t SpaceLeft() const { return fBufferSize - fCurrentEnd; }
if (length > 0 && length >= SpaceLeft())
int SpaceLeft() const;
if (SpaceLeft() < size) {
if (fBufferSize > 0 && (minSize > SpaceLeft() || fCurrentStart >= kWatermark)) {
bool SpaceLeft() const;
if (!info.chunkCache->SpaceLeft()