Did a quick and dirty implementation to read a file from Java. Immediately ran into the "ustar " vs. "ustar" magic strings used to differentiate between format

Did a quick and dirty implementation to read a file from Java. Immediately ran into the "ustar " vs. "ustar" magic strings used to differentiate between format versions as I generated files on several different systems. That lead to some head scratching because I couldn't comprehend why there would be a difference on that last whitespace.