/// <summary>
/// Do the linking of one file
/// Ensures that duplicate link limits are not exceeded
/// </summary>
/// <param name="file">The DuplicateFile to link into one</param>
static void LinkDuplicates(DuplicateFile file)
{
file.instances.Sort();
var newExtension = ".DVSLINKER.BAK";
string prefix = "\\\\?\\"; // @"\?";
var orig = prefix + file.instances[0];
uint links = GetLinks(file);
for (int n = 1; n < file.instances.Count; n++, links++)
{
if (links >= 1023)
{
orig = prefix + file.instances[n];
links = GetLinks(file.instances[n]) - 1; //for loops adds 1 back on
}
else
{
var backup = file.instances[n] + newExtension;
try {
if (File.Exists(backup))
{
File.Delete(backup);
}
File.Copy(file.instances[n], backup); //backup
File.Delete(file.instances[n]);
}
catch {
if (!File.Exists(file.instances[n]))
{
if (File.Exists(backup))
{
File.Copy(backup, file.instances[n]);
File.Delete(backup);
}
}
continue;
}
var path = prefix + file.instances[n];
if (!Dll.CreateHardLink(path, orig, IntPtr.Zero))
{
uint error = Dll.GetLastError(); //Marshal.GetLastWin32Error();
Debug.WriteLine("ERROR: " + error);
File.Copy(backup, file.instances[n]); //restore backup
File.Delete(backup);
}
else
{
File.Delete(backup); //remove backup because HardLink worked
}
}
}
}
/// <summary>
/// Gets the number of HardLinks of a given <paramref name="filePath"/>
/// </summary>
/// <param name="filePath">Path to the file</param>
/// <returns></returns>
static uint GetLinks(string filePath)
{
//try {
using (var f = new FileStream(filePath, FileMode.Open, FileAccess.Read)) {
Dll.GetFileInformationByHandle(f.Handle, out var info);
return(info.NumberOfLinks);
}
//}
//catch {
// return uint.MaxValue;
//}
}
