C# UTF8 Encoding with CP1252 Fallback

DecoderCP1252Fallback.cs

public class DecoderCP1252Fallback : DecoderFallback
    {
        public override DecoderFallbackBuffer CreateFallbackBuffer()
        {
            return new DecoderCP1252FallbackBuffer();
        }

        public override int MaxCharCount {
            get {
                return 1;
            }
        }
    }
    public class DecoderCP1252FallbackBuffer : DecoderFallbackBuffer
    {
        readonly Encoding cp1252 = Encoding.GetEncoding(1252);
        byte[] bytesUnknown;
        int fallbackCount = -1;
        int fallbackIndex = -1;

        public override void Reset()
        {
            fallbackCount = -1;
            fallbackIndex = -1;
            bytesUnknown = null;
        }

        // Fallback Methods
        public override bool Fallback(byte[] bytesUnknown, int index)
        {
            Reset();
            this.bytesUnknown = bytesUnknown;
            fallbackCount = bytesUnknown.Length;
            fallbackIndex = -1;
            return true;
        }

        public override char GetNextChar()
        {
            fallbackCount--;
            fallbackIndex++;

            if (fallbackCount < 0)
                return '\0';
            if (fallbackCount == int.MaxValue)
            {
                fallbackCount = -1;
                return '\0';
            }
            return cp1252.GetString(bytesUnknown, fallbackIndex, 1)[0];
        }

        public override bool MovePrevious()
        {
            if (fallbackCount >= -1 && fallbackIndex >= 0)
            {
                fallbackIndex--;
                fallbackCount++;
                return true;
            }
            return false;
        }

        public override int Remaining => (fallbackCount < 0) ? 0 : fallbackCount;
    }

How-To-Use.cs

Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
var utf8Encoding = Encoding.GetEncoding("utf-8", Encoding.UTF8.EncoderFallback, new DecoderCP1252Fallback());
var test = utf8Encoding.GetString(new byte[] { 0x76, 0xF3, 0xF3, 0x72 });
Console.OutputEncoding = Encoding.Unicode;
Console.WriteLine(test);