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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Globalization;
namespace System.Net.Http.Headers
{
internal sealed class Int32NumberHeaderParser : BaseHeaderParser
{
// Note that we don't need a custom comparer even though we have a value type that gets boxed (comparing two
// equal boxed value types returns 'false' since the object instances used for boxing the two values are
// different). The reason is that the comparer is only used by HttpHeaders when comparing values in a collection.
// Value types are never used in collections (in fact HttpHeaderValueCollection expects T to be a reference
// type).
internal static readonly Int32NumberHeaderParser Parser = new Int32NumberHeaderParser();
private Int32NumberHeaderParser()
: base(false)
{
}
public override string ToString(object value)
{
Debug.Assert(value is int);
return ((int)value).ToString(NumberFormatInfo.InvariantInfo);
}
protected override int GetParsedValueLength(string value, int startIndex, object? storeValue,
out object? parsedValue)
{
parsedValue = null;
int numberLength = HttpRuleParser.GetNumberLength(value, startIndex, false);
if ((numberLength == 0) || (numberLength > HttpRuleParser.MaxInt32Digits))
{
return 0;
}
int result;
if (!HeaderUtilities.TryParseInt32(value, startIndex, numberLength, out result))
{
return 0;
}
parsedValue = result;
return numberLength;
}
}
}
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