IMultiStreamSource for gzipped file

GzFileSource.cs

public sealed class GzFileSource : IMultiStreamSource
{
    private readonly string[] _paths;

    public GzFileSource(params string[] paths)
    {
        if (paths == null || (paths.Length == 1 && paths[0] == null))
        {
            _paths = new string[0];
            return;
        }

        _paths = paths;
    }

    public int Count
    {
        get { return _paths.Length; }
    }

    public string GetPathOrNull(int index)
    {
        return _paths[index];
    }

    public Stream Open(int index)
    {
        var path = _paths[index];

        var s = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

        return new GZipStream(s, CompressionMode.Decompress, false);
    }

    public TextReader OpenTextReader(int index)
    {
        return new StreamReader(Open(index));
    }
}