KnownHeader.cs

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using System.Diagnostics.CodeAnalysis;
using System.Net.Http.HPack;
using System.Net.Http.QPack;
using System.Text;
 
namespace System.Net.Http.Headers;
 
internal sealed class KnownHeader
{
    public string Name { get; }
 
    public HttpHeaderParser Parser { get; }
 
    public HttpHeaderType HeaderType { get; }
 
    public string[] KnownValues { get; }
 
    public byte[] AsciiBytesWithColonSpace { get; }
 
    public HeaderDescriptor Descriptor => new HeaderDescriptor(this);
 
    public byte[] Http2EncodedName { get; private set; }
 
    public byte[] Http3EncodedName { get; private set; }
 
    public KnownHeader(string name, int? http2StaticTableIndex = null, int? http3StaticTableIndex = null)
        : this(name, HttpHeaderType.Custom, null, null, http2StaticTableIndex, http3StaticTableIndex)
    {
    }
 
    public KnownHeader(string name, HttpHeaderType headerType, HttpHeaderParser parser, string[] knownValues = null, int? http2StaticTableIndex = null, int? http3StaticTableIndex = null)
    {
        Name = name;
        HeaderType = headerType;
        Parser = parser;
        KnownValues = knownValues;
        Initialize(http2StaticTableIndex, http3StaticTableIndex);
        byte[] array = new byte[name.Length + 2];
        int bytes = Encoding.ASCII.GetBytes(name, array);
        array[^2] = 58;
        array[^1] = 32;
        AsciiBytesWithColonSpace = array;
    }
 
    [MemberNotNull("Http2EncodedName")]
    [MemberNotNull("Http3EncodedName")]
    private void Initialize(int? http2StaticTableIndex, int? http3StaticTableIndex)
    {
        Http2EncodedName = (http2StaticTableIndex.HasValue ? HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexingToAllocatedArray(http2StaticTableIndex.GetValueOrDefault()) : HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexingNewNameToAllocatedArray(Name));
        Http3EncodedName = (http3StaticTableIndex.HasValue ? QPackEncoder.EncodeLiteralHeaderFieldWithStaticNameReferenceToArray(http3StaticTableIndex.GetValueOrDefault()) : QPackEncoder.EncodeLiteralHeaderFieldWithoutNameReferenceToArray(Name));
    }
}