EncoderExceptionFallbackBuffer.cs

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namespace System.Text;
 
public sealed class EncoderExceptionFallbackBuffer : EncoderFallbackBuffer
{
    public override int Remaining => 0;
 
    public override bool Fallback(char charUnknown, int index)
    {
        throw new EncoderFallbackException(SR.Format(SR.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", SR.Format(SR.ArgumentOutOfRange_Range, 55296, 56319));
        }
        if (!char.IsLowSurrogate(charUnknownLow))
        {
            throw new ArgumentOutOfRangeException("charUnknownLow", SR.Format(SR.ArgumentOutOfRange_Range, 56320, 57343));
        }
        int num = char.ConvertToUtf32(charUnknownHigh, charUnknownLow);
        throw new EncoderFallbackException(SR.Format(SR.Argument_InvalidCodePageConversionIndex, num, index), charUnknownHigh, charUnknownLow, index);
    }
 
    public override char GetNextChar()
    {
        return '\0';
    }
 
    public override bool MovePrevious()
    {
        return false;
    }
}