XmlUTF8TextWriter.cs

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using System.IO;
using System.Text;
 
namespace System.Xml;
 
internal sealed class XmlUTF8TextWriter : XmlBaseWriter, IXmlTextWriterInitializer
{
    private XmlUTF8NodeWriter _writer;
 
    public void SetOutput(Stream stream, Encoding encoding, bool ownsStream)
    {
        if (stream == null)
        {
            throw new ArgumentNullException("stream");
        }
        if (encoding == null)
        {
            throw new ArgumentNullException("encoding");
        }
        if (encoding.WebName != Encoding.UTF8.WebName)
        {
            stream = new EncodingStreamWrapper(stream, encoding, emitBOM: true);
        }
        if (_writer == null)
        {
            _writer = new XmlUTF8NodeWriter();
        }
        _writer.SetOutput(stream, ownsStream, encoding);
        SetOutput(_writer);
    }
 
    protected override XmlSigningNodeWriter CreateSigningNodeWriter()
    {
        return new XmlSigningNodeWriter(text: true);
    }
}