ParsedString.cs

public ref struct ParsedString
	{
		private readonly ReadOnlySpan<byte> _valueSpan;
		private readonly Encoding _encoding;
		private readonly string _value;

		public bool IsDeferred { get; }

		/// <summary>
		/// Deferred reading ctor.
		/// </summary>
		/// <param name="valueSpan"></param>
		/// <param name="encoding"></param>
		public ParsedString(ReadOnlySpan<byte> valueSpan, Encoding encoding)
		{
			_valueSpan = valueSpan;
			_encoding = encoding;
			_value = default;
			IsDeferred = true;
		}

		/// <summary>
		/// Non-deferred reading ctor.
		/// </summary>
		/// <param name="value"></param>
		public ParsedString(string value)
		{
			_valueSpan = default;
			_encoding = default;
			_value = value;
			IsDeferred = false;
		}

		public string GetString()
		{
			if (!IsDeferred)
				return _value;

			if (_valueSpan.IsEmpty)
				return string.Empty;

			unsafe
			{
				fixed (byte* ptr = _valueSpan)
				{
					return _encoding.GetString(ptr, _valueSpan.Length);
				}
			}
		}
	}