AsciiByteMap.cs

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using System.Runtime.CompilerServices;
 
namespace System.Text.Encodings.Web;
 
internal struct AsciiByteMap
{
    private unsafe fixed byte Buffer[128];
 
    internal unsafe void InsertAsciiChar(char key, byte value)
    {
        if (key < '\u0080')
        {
            Buffer[(uint)key] = value;
        }
    }
 
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    internal unsafe readonly bool TryLookup(Rune key, out byte value)
    {
        if (key.IsAscii)
        {
            byte b = Buffer[(uint)key.Value];
            if (b != 0)
            {
                value = b;
                return true;
            }
        }
        value = 0;
        return false;
    }
}