Umbraco-CMS/src/Umbraco.Core/IO/FileSystemExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Umbraco.Core.CodeAnnotations;

namespace Umbraco.Core.IO
{
	[UmbracoExperimentalFeature("http://issues.umbraco.org/issue/U4-1156", "Will be declared public after 4.10")]
    public static class FileSystemExtensions
    {
		[UmbracoExperimentalFeature("", "Will be declared public after 4.10")]
        internal static long GetSize(this IFileSystem fs, string path)
        {
            var s = fs.OpenFile(path);
            var size = s.Length;
            s.Close();

            return size;
        }

		[UmbracoExperimentalFeature("", "Will be declared public after 4.10")]
        internal static void CopyFile(this IFileSystem fs, string path, string newPath)
        {
            fs.AddFile(newPath, fs.OpenFile(path));
        }
    }
}