ProductInfoHeaderParser.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Net.Http.Headers;
 
internal sealed class ProductInfoHeaderParser : HttpHeaderParser
{
    internal static readonly ProductInfoHeaderParser SingleValueParser = new ProductInfoHeaderParser(supportsMultipleValues: false);
 
    internal static readonly ProductInfoHeaderParser MultipleValueParser = new ProductInfoHeaderParser(supportsMultipleValues: true);
 
    private ProductInfoHeaderParser(bool supportsMultipleValues)
        : base(supportsMultipleValues, " ")
    {
    }
 
    public override bool TryParseValue([NotNullWhen(true)] string value, object storeValue, ref int index, [NotNullWhen(true)] out object parsedValue)
    {
        parsedValue = null;
        if (string.IsNullOrEmpty(value) || index == value.Length)
        {
            return false;
        }
        int num = index + HttpRuleParser.GetWhitespaceLength(value, index);
        if (num == value.Length)
        {
            return false;
        }
        ProductInfoHeaderValue parsedValue2;
        int productInfoLength = ProductInfoHeaderValue.GetProductInfoLength(value, num, out parsedValue2);
        if (productInfoLength == 0)
        {
            return false;
        }
        num += productInfoLength;
        if (num < value.Length)
        {
            char c = value[num - 1];
            if (c != ' ' && c != '\t')
            {
                return false;
            }
        }
        index = num;
        parsedValue = parsedValue2;
        return true;
    }
}