System.Net.Http.Headers.WarningHeaderValue.TryReadCode C# (CSharp) Method

        private static bool TryReadCode(string input, ref int current, out int code)
        {
            code = 0;
            int codeLength = HttpRuleParser.GetNumberLength(input, current, false);

            // code must be a 3 digit value. We accept less digits, but we don't accept more.
            if ((codeLength == 0) || (codeLength > 3))
            {
                return false;
            }

            if (!HeaderUtilities.TryParseInt32(input.Substring(current, codeLength), out code))
            {
                Debug.Assert(false, "Unable to parse value even though it was parsed as <=3 digits string. Input: '" +
                    input + "', Current: " + current + ", CodeLength: " + codeLength);
                return false;
            }

            current = current + codeLength;

            int whitespaceLength = HttpRuleParser.GetWhitespaceLength(input, current);
            current = current + whitespaceLength;

            // Make sure the number is followed by at least one whitespace and that we have characters left to parse.
            if ((whitespaceLength == 0) || (current == input.Length))
            {
                return false;
            }

            return true;
        }