EncodingByteBufferWriter.cs

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using System;
using System.Buffers;
using System.Text;
 
namespace IKVM.CoreLib.Text
{
 
    struct EncodingByteBufferWriter<TWriter>
        where TWriter : IBufferWriter<byte>
    {
 
        readonly Encoding _encoding;
        TWriter _buffer;
        int _bytesWritten;
        int _charsWritten;
 
        public EncodingByteBufferWriter(Encoding encoding, ref TWriter buffer)
        {
            _encoding = encoding ?? throw new ArgumentNullException(nameof(encoding));
            _buffer = buffer ?? throw new ArgumentNullException(nameof(buffer));
        }
 
        public readonly int BytesWritten => _bytesWritten;
 
        public readonly int CharsWritten => _charsWritten;
 
        public void Write(string text)
        {
            var l = _encoding.GetByteCount(text);
            var b = _buffer.GetSpan(l);
            new EncodingSpanWriter(_encoding, b).Write(text);
            _buffer.Advance(l);
            _bytesWritten += l;
            _charsWritten += text.Length;
        }
 
        public void Write(ReadOnlySpan<char> text)
        {
            var l = _encoding.GetByteCount(text);
            var b = _buffer.GetSpan(l);
            new EncodingSpanWriter(_encoding, b).Write(text);
            _buffer.Advance(l);
            _bytesWritten += l;
            _charsWritten += text.Length;
        }
 
        public void WriteLine()
        {
            Write(Environment.NewLine);
        }
 
    }
 
}