Stefan Friesel 5273bebcc6 Handle stream CRC of empty streams correctly ...

streamCRC being null indicates that the last BZ2 stream ended or
none has started yet.
Once in a BZ2 stream, the value needs to be initialized to 0 even
when it contains no blocks to pass the final CRC check.
A completely empty input stream leaves streamCRC at null and
likewise produces an empty output.

2020-03-31 22:04:32 +02:00

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