private static T GetSecurityDescriptor <T>(uint lastError, bool isFolder, string path, SafeGlobalMemoryBufferHandle securityDescriptor)
{
ObjectSecurity objectSecurity;
using (securityDescriptor)
{
if (lastError == Win32Errors.ERROR_FILE_NOT_FOUND || lastError == Win32Errors.ERROR_PATH_NOT_FOUND)
{
lastError = isFolder ? Win32Errors.ERROR_PATH_NOT_FOUND : Win32Errors.ERROR_FILE_NOT_FOUND;
}
// If the function fails, the return value is zero.
if (lastError != Win32Errors.ERROR_SUCCESS)
{
if (!Utils.IsNullOrWhiteSpace(path))
{
NativeError.ThrowException(lastError, path);
}
else
{
NativeError.ThrowException((int)lastError);
}
}
if (!NativeMethods.IsValidHandle(securityDescriptor, false))
{
throw new IOException(Resources.Returned_Invalid_Security_Descriptor);
}
uint length = Security.NativeMethods.GetSecurityDescriptorLength(securityDescriptor);
// Seems not to work: Method .CopyTo: length > Capacity, so an Exception is thrown.
//byte[] managedBuffer = new byte[length];
//pSecurityDescriptor.CopyTo(managedBuffer, 0, (int) length);
byte[] managedBuffer = securityDescriptor.ToByteArray(0, (int)length);
objectSecurity = isFolder ? (ObjectSecurity) new DirectorySecurity() : new FileSecurity();
objectSecurity.SetSecurityDescriptorBinaryForm(managedBuffer);
}
return((T)(object)objectSecurity);
}