EncoderExceptionFallbackBuffer.cs

namespace System.Text
{
    public sealed class EncoderExceptionFallbackBuffer : EncoderFallbackBuffer
    {
        public override int Remaining => 0;

        public override bool Fallback(char charUnknown, int index)
        {
            throw new EncoderFallbackException(Environment.GetResourceString("Argument_InvalidCodePageConversionIndex", (int)charUnknown, index), charUnknown, index);
        }

        public override bool Fallback(char charUnknownHigh, char charUnknownLow, int index)
        {
            if (!char.IsHighSurrogate(charUnknownHigh))
            {
                throw new ArgumentOutOfRangeException("charUnknownHigh", Environment.GetResourceString("ArgumentOutOfRange_Range", 55296, 56319));
            }
            if (!char.IsLowSurrogate(charUnknownLow))
            {
                throw new ArgumentOutOfRangeException("CharUnknownLow", Environment.GetResourceString("ArgumentOutOfRange_Range", 56320, 57343));
            }
            int num = char.ConvertToUtf32(charUnknownHigh, charUnknownLow);
            throw new EncoderFallbackException(Environment.GetResourceString("Argument_InvalidCodePageConversionIndex", num, index), charUnknownHigh, charUnknownLow, index);
        }

        public override char GetNextChar()
        {
            return '\0';
        }

        public override bool MovePrevious()
        {
            return false;
        }
    }
}