Start, End int64
}

// GetLength - get length of range
func (h *HTTPRangeSpec) GetLength(resourceSize int64) (rangeLength int64, err error) {
	switch {
	case resourceSize < 0:
		return 0, errors.New("Resource size cannot be negative")

	case h == nil:
		rangeLength = resourceSize

	case h.IsSuffixLength:
		specifiedLen := -h.Start
		rangeLength = specifiedLen
		if specifiedLen > resourceSize {
			rangeLength = resourceSize