bz2 module doesn't work properly with all bz2 files

[Magdoll]

I'm not sure what's causing this, but depending on the compression
program used, the bz2 module sometimes exits earlier.

I used pbzip2 to compress my bz2 files and read through the file using
the bz2 module. The file descriptor always exits much earlier than
where the actual EOF is. If I use bzip2 instead of pbzip2 to compress
the files, then everything is fine.

My files are generally big (several GBs) so decompressing them is not
a wise choice, and it is a little unfortunate that I can't use pbzip2
because it's usually much faster than bz2.