Incorrect Padding When Content Fills a Block Exactly

[Micah Lee]

When the size of an input file is exactly a factor of 512 (the block size), then an extra block of null bytes is incorrectly appended to the file content, causing the resulting tar archive to be corrupt.

Source Reference:

memtar/lib/memtar.rb

Line 19 in 17adecc

 @io.write "\0" * (512 - size % 512)