public override void EraseFileSystemObject(StreamInfo info, ErasureMethod method,
ErasureMethodProgressFunction callback)
{
VolumeInfo volume = VolumeInfo.FromMountpoint(info.DirectoryName);
if (info.Length < Math.Max(volume.ClusterSize, 1024))
{
using (FileStream strm = info.Open(FileMode.Open, FileAccess.Write,
FileShare.None))
{
method.Erase(strm, long.MaxValue,
PrngManager.GetInstance(ManagerLibrary.Settings.ActivePrng), null);
}
}
long fileArea = GetFileArea(info.FullName);
if (fileArea == 0)
return;
using (FileStream strm = info.Open(FileMode.Open, FileAccess.Write,
FileShare.None, FileOptions.WriteThrough))
{
strm.SetLength(fileArea);
method.Erase(strm, long.MaxValue,
PrngManager.GetInstance(ManagerLibrary.Settings.ActivePrng),
callback
);
strm.Seek(0, SeekOrigin.Begin);
strm.SetLength(0);
}
}
public override void EraseClusterTips(VolumeInfo info, ErasureMethod method,
ClusterTipsSearchProgress searchCallback, ClusterTipsEraseProgress eraseCallback)
{
List<string> files = new List<string>();
if (!info.IsMounted)
throw new InvalidOperationException(S._("Could not erase cluster tips in {0} " +
"as the volume is not mounted.", info.VolumeId));
ListFiles(new DirectoryInfo(info.MountPoints[0]), files, searchCallback);
for (int i = 0, j = files.Count; i != j; ++i)
{
StreamInfo streamInfo = new StreamInfo(files[i]);
FileAttributes fileAttr = streamInfo.Attributes;
try
{
streamInfo.Attributes = FileAttributes.Normal;
EraseFileClusterTips(files[i], method);
}
catch (UnauthorizedAccessException)
{
Logger.Log(S._("{0} did not have its cluster tips erased because you do not " +
"have the required permissions to erase the file cluster tips.", files[i]),
LogLevel.Information);
}
catch (IOException e)
{
Logger.Log(S._("{0} did not have its cluster tips erased. The error returned " +
"was: {1}", files[i], e.Message), LogLevel.Error);
}
finally
{
streamInfo.Attributes = fileAttr;
}
eraseCallback(i, files.Count, files[i]);
}
}
public FirstLast16KB()
{
try
{
if (DefaultPlugin.Settings.FL16Method != Guid.Empty)
method = ErasureMethodManager.GetInstance(
DefaultPlugin.Settings.FL16Method);
else if (ManagerLibrary.Settings.DefaultFileErasureMethod != Guid)
method = ErasureMethodManager.GetInstance(
ManagerLibrary.Settings.DefaultFileErasureMethod);
else
method = ErasureMethodManager.GetInstance(new Gutmann().Guid);
}
catch (ErasureMethodNotFoundException)
{
MessageBox.Show(S._("The First/last 16KB erasure method " +
"requires another erasure method to erase the file.\n\nThis must " +
"be set in the Plugin Settings dialog."), Name, MessageBoxButtons.OK,
MessageBoxIcon.Error, MessageBoxDefaultButton.Button1,
S.IsRightToLeft(null) ? MessageBoxOptions.RtlReading : 0);
}
}
private void EraseFileClusterTips(string file, ErasureMethod method)
{
StreamInfo streamInfo = new StreamInfo(file);
DateTime lastAccess = streamInfo.LastAccessTime;
DateTime lastWrite = streamInfo.LastWriteTime;
DateTime created = streamInfo.CreationTime;
long fileArea = GetFileArea(file);
long fileLength = streamInfo.Length;
if (fileArea == fileLength)
return;
using (FileStream stream = streamInfo.Open(FileMode.Open, FileAccess.Write,
FileShare.None, FileOptions.WriteThrough))
{
try
{
stream.SetLength(fileArea);
stream.Seek(fileLength, SeekOrigin.Begin);
method.Erase(stream, long.MaxValue, PrngManager.GetInstance(
ManagerLibrary.Settings.ActivePrng), null);
}
finally
{
stream.SetLength(fileLength);
streamInfo.LastAccessTime = lastAccess;
streamInfo.LastWriteTime = lastWrite;
streamInfo.CreationTime = created;
}
}
}
public override void EraseOldFileSystemResidentFiles(VolumeInfo volume,
DirectoryInfo tempDirectory, ErasureMethod method,
FileSystemEntriesEraseProgress callback)
{
try
{
long oldMFTSize = NtfsApi.GetMftValidSize(volume);
for (; ; )
{
using (FileStream strm = new FileStream(
GenerateRandomFileName(tempDirectory, 18), FileMode.CreateNew,
FileAccess.Write, FileShare.None, 8, FileOptions.WriteThrough))
{
long streamSize = 0;
try
{
while (true)
{
strm.SetLength(++streamSize);
method.Erase(strm, long.MaxValue,
PrngManager.GetInstance(ManagerLibrary.Settings.ActivePrng),
null);
}
}
catch (IOException)
{
if (streamSize == 1)
return;
}
}
if (NtfsApi.GetMftValidSize(volume) > oldMFTSize)
break;
}
}
catch (IOException)
{
}
}
public abstract void EraseOldFileSystemResidentFiles(VolumeInfo volume, DirectoryInfo tempDirectory, ErasureMethod method, FileSystemEntriesEraseProgress callback);
public abstract void EraseFileSystemObject(StreamInfo info, ErasureMethod method, ErasureMethodProgressFunction callback);
public abstract void EraseClusterTips(VolumeInfo info, ErasureMethod method, Logger log, ClusterTipsSearchProgress searchCallback, ClusterTipsEraseProgress eraseCallback);
public override void EraseFileSystemObject(StreamInfo info, ErasureMethod method,
ErasureMethodProgressFunction callback)
{
long fileArea = GetFileArea(info.FullName);
using (FileStream strm = info.Open(FileMode.Open, FileAccess.Write,
FileShare.None, FileOptions.WriteThrough))
{
strm.SetLength(fileArea);
if (strm.Length != 0)
{
method.Erase(strm, long.MaxValue,
PrngManager.GetInstance(ManagerLibrary.Settings.ActivePrng),
callback
);
}
strm.Seek(0, SeekOrigin.Begin);
strm.SetLength(0);
}
}
public static void Register(ErasureMethod method, object[] parameters)
{
ConstructorInfo ctor = null;
if (parameters == null || parameters.Length == 0)
ctor = method.GetType().GetConstructor(Type.EmptyTypes);
else
{
Type[] parameterTypes = new Type[parameters.Length];
for (int i = 0; i < parameters.Length; ++i)
parameterTypes[i] = parameters[i].GetType();
ctor = method.GetType().GetConstructor(parameterTypes);
}
if (ctor == null)
throw new ArgumentException(S._("Registered erasure methods must contain " +
"a parameterless constructor that is called whenever clients request " +
"for an instance of the method. If a constructor requires parameters, " +
"specify it in the parameters parameter."));
lock (ManagerLibrary.Instance.ErasureMethodManager.methods)
{
MethodConstructorInfo info = new MethodConstructorInfo();
info.Constructor = ctor;
info.Parameters = parameters == null || parameters.Length == 0 ? null : parameters;
ManagerLibrary.Instance.ErasureMethodManager.methods.Add(method.Guid, info);
}
OnMethodRegistered(new ErasureMethodRegistrationEventArgs(method.Guid));
}
public static void Register(ErasureMethod method)
{
Register(method, new object[0]);
}
