DecoderExceptionFallbackBuffer.cs

Go to the documentation of this file.

using System.Diagnostics.CodeAnalysis;
 
namespace System.Text;
 
public sealed class DecoderExceptionFallbackBuffer : DecoderFallbackBuffer
{
    public override int Remaining => 0;
 
    public override bool Fallback(byte[] bytesUnknown, int index)
    {
        Throw(bytesUnknown, index);
        return true;
    }
 
    public override char GetNextChar()
    {
        return '\0';
    }
 
    public override bool MovePrevious()
    {
        return false;
    }
 
    [DoesNotReturn]
    private static void Throw(byte[] bytesUnknown, int index)
    {
        if (bytesUnknown == null)
        {
            bytesUnknown = Array.Empty<byte>();
        }
        StringBuilder stringBuilder = new StringBuilder(bytesUnknown.Length * 4);
        for (int i = 0; i < bytesUnknown.Length && i < 20; i++)
        {
            StringBuilder stringBuilder2 = stringBuilder;
            StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(2, 1, stringBuilder2);
            handler.AppendLiteral("[");
            handler.AppendFormatted(bytesUnknown[i], "X2");
            handler.AppendLiteral("]");
            stringBuilder2.Append(ref handler);
        }
        if (bytesUnknown.Length > 20)
        {
            stringBuilder.Append(" ...");
        }
        throw new DecoderFallbackException(SR.Format(SR.Argument_InvalidCodePageBytesIndex, stringBuilder, index), bytesUnknown, index);
    }
}