HardLinks - Manage your library of common classes

using System;
using System.Windows.Forms;
using System.Collections;
using System.IO;
using System.Diagnostics;

using Common;

namespace HardLinks
{
	/// <summary>
	/// Summary description for Methods.
	/// </summary>
	public class Methods
	{
		public static Links ScanDisk( string RealRoot, string LinkRoot )
		{
			Links Links = new Links();

			Links.AddDirectory( RealRoot );
			Links.AddDirectory( RealRoot, LinkRoot );

			DirectoryInfo di = new DirectoryInfo( RealRoot );
			if ( ! di.Exists ) { Debug.Assert( true ); return Links; }

			FileStream fsRealFile = null;
			FileStream fsLinkFile = null;
			FileInfo[] Files = di.GetFiles();
			foreach ( FileInfo RealFile in Files )
			{
				BY_HANDLE_FILE_INFORMATION infoRealFile;
				fsRealFile = RealFile.Open( FileMode.Open, FileAccess.Read, FileShare.ReadWrite );
				bool bRealFile = Kernel32.GetFileInformationByHandle( fsRealFile.Handle, out infoRealFile );
				if ( ! bRealFile ) { Debug.Assert( false ); goto next; }

				string LinkFileName = LinkRoot + "\\" + RealFile.Name;
				FileInfo LinkFile = new FileInfo( LinkFileName );

				if ( ! LinkFile.Exists )
				{
					Links.Add( RealRoot, LinkRoot, RealFile.Name, Linked.NoFile );
					goto next;
				}

				BY_HANDLE_FILE_INFORMATION infoLinkFile;
				fsLinkFile = LinkFile.Open( FileMode.Open, FileAccess.Read, FileShare.ReadWrite );
				bool bLinkFile = Kernel32.GetFileInformationByHandle( fsLinkFile.Handle, out infoLinkFile );
				if ( ! bLinkFile ) { Debug.Assert( false ); goto next; }

				if ( infoLinkFile.dwVolumeSerialNumber != infoRealFile.dwVolumeSerialNumber ||
					infoLinkFile.nFileIndexHigh != infoRealFile.nFileIndexHigh ||
					infoLinkFile.nFileIndexLow  != infoRealFile.nFileIndexLow  )
				{
					string s = "Link file exists, but is not a link to the real file !\n\n"
						+ "Real file : " + RealFile.FullName + "\n"
						+ "Link file : " + LinkFile.FullName ;
//					MessageBox.Show( s, "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning );
					Links.Add( RealRoot, LinkRoot, RealFile.Name, Linked.FileExists );
					goto next;
				}

				Links.Add( RealRoot, LinkRoot, RealFile.Name, Linked.Linked );

			next:
				if ( fsLinkFile != null ) fsLinkFile.Close();
				if ( fsRealFile != null ) fsRealFile.Close();
			}

			return Links;
		}
	}
}