System.Net.Http.CurlResponseHeaderReader.HeaderBufferSpan.Substring C# (CSharp) Method

            public HeaderBufferSpan Substring(int startIndex, int length)
            {
                Debug.Assert(startIndex >= 0);
                Debug.Assert(length >= 0);
                Debug.Assert(startIndex <= Length - length);

                if (length == 0)
                {
                    return Empty;
                }

                if (startIndex == 0 && length == Length)
                {
                    return this;
                }

                return new HeaderBufferSpan(_pointer + startIndex, length);
            }