Nikolaus Rath added the comment:
Is there any reason why unconsumed_tail needs to be exposted?
I would suggest to instead introduce a boolean attribute data_ready than
indicates that more decompressed data can be provided without additional
compressed input.
Example:
# decomp = decompressor object
# infh = compressed input stream
# outfh = decompressed output stream
while not decomp.eof:
if decomp.data_ready:
buf = decomp.decompress(max_size=BUFSIZE)
# or maybe:
#buf = decomp.decompress(b'', max_size=BUFSIZE)
else:
buf = infh.read(BUFSIZE)
if not buf:
raise RuntimeError('Unexpected end of compressed stream')
buf = decomp.decompress(buf, max_size=BUFSIZE)
assert len(buf) > 0
outfh.write(buf)
This is short, easily readable (in my opinion) and also avoids the problem
where the decompressor blocks because it needs more data even though there
still is an unconsumed tail.
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<http://bugs.python.org/issue15955>
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