System.Net.Http.Headers.TransferCodingHeaderValue.GetTransferCodingLength C# (CSharp) Метод

        internal static int GetTransferCodingLength(string input, int startIndex,
            Func<TransferCodingHeaderValue> transferCodingCreator, out TransferCodingHeaderValue parsedValue)
        {
            Debug.Assert(transferCodingCreator != null);
            Debug.Assert(startIndex >= 0);

            parsedValue = null;

            if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
            {
                return 0;
            }

            // Caller must remove leading whitespace. If not, we'll return 0.
            int valueLength = HttpRuleParser.GetTokenLength(input, startIndex);

            if (valueLength == 0)
            {
                return 0;
            }

            string value = input.Substring(startIndex, valueLength);
            int current = startIndex + valueLength;
            current = current + HttpRuleParser.GetWhitespaceLength(input, current);
            TransferCodingHeaderValue transferCodingHeader = null;

            // If we're not done and we have a parameter delimiter, then we have a list of parameters.
            if ((current < input.Length) && (input[current] == ';'))
            {
                transferCodingHeader = transferCodingCreator();
                transferCodingHeader._value = value;

                current++; // skip delimiter.
                int parameterLength = NameValueHeaderValue.GetNameValueListLength(input, current, ';',
                    (ObjectCollection<NameValueHeaderValue>)transferCodingHeader.Parameters);

                if (parameterLength == 0)
                {
                    return 0;
                }

                parsedValue = transferCodingHeader;
                return current + parameterLength - startIndex;
            }

            // We have a transfer coding without parameters.
            transferCodingHeader = transferCodingCreator();
            transferCodingHeader._value = value;
            parsedValue = transferCodingHeader;
            return current - startIndex;
        }

        protected override int GetParsedValueLength(string value, int startIndex, object?storeValue,
                                                    out object?parsedValue)
        {
            int resultLength = TransferCodingHeaderValue.GetTransferCodingLength(value, startIndex,
                                                                                 _transferCodingCreator, out TransferCodingHeaderValue? temp);

            parsedValue = temp;
            return(resultLength);
        }