hasChecksum bool

	// Whether we have read at least one frame.
	readOneFrame bool

	// True if the frame size is not known.
	frameSizeUnknown bool

	// The number of uncompressed bytes remaining in the current frame.
	// If frameSizeUnknown is true, this is not valid.
	remainingFrameSize uint64

	// The number of bytes read from r up to the start of the current
	// block, for error reporting.