This function checks a sequence of tar entries for file name security problems. It checks that:

• file paths are not absolute
• file paths do not contain any path components that are ".."
• file names are valid

These checks are from the perspective of the current OS. That means we check for "C:blah" files on Windows and "/blah" files on Unix. For archive entry types HardLink and SymbolicLink the same checks are done for the link target. A failure in any entry terminates the sequence of entries with an error.