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func parseCopyPartRangeSpec(rangeString string) (hrange *HTTPRangeSpec, err error) {
	hrange, err = parseRequestRangeSpec(rangeString)
	if err != nil {
		return nil, err
	}
	if hrange.IsSuffixLength || hrange.Start < 0 || hrange.End < 0 {
		return nil, errInvalidRange
	}
	return hrange, nil
}

// checkCopyPartRangeWithSize adds more check to the range string in case of