This assumed that a `read` would succeed for the full length, thus
interpreting in a subsequent call some data bits as a header.
For instance, consider 77 bytes of literal were left and a buffer of
1024 bytes was provided. Then the `read` call might return 60 which was
ignored and assumed to be 77. Thus the next 17 bytes of literal data
were instead interpreted as a header due to setting `self.count` to 0.
Andreas Molzer
1f7b25ef55