Hi,
 
Currently, zpq_stream contains a check only for the tx buffered data - zpq_buffered().
 
I think that there should be the same functionality for rx buffered data. For example, the zpq_buffered_rx().
 
zpq_buffered_rx() returns a value greater than zero if there is any data that was fetched by rx_func() but haven't been decompressed yet, in any other case zpq_buffered_rx() returns zero.
 
In this case, I think that we may also rename the existing zpq_buffered() to zpq_buffered_tx() for clarity.

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Daniil Zakhlystov