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Allocation of a large compression window may fail, and in that case keep the `DeflateIO` state consistent so its other methods (such as `close()`) still work. Consistency is kept by only updating the `self->write` member if the window allocation succeeds. Thanks to @jimmo for finding the bug. Signed-off-by: Damien George <damien@micropython.org>
40 lines
809 B
Python
40 lines
809 B
Python
# Test deflate.DeflateIO compression, with out-of-memory errors.
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try:
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# Check if deflate is available.
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import deflate
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import io
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except ImportError:
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print("SKIP")
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raise SystemExit
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# Check if compression is enabled.
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if not hasattr(deflate.DeflateIO, "write"):
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print("SKIP")
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raise SystemExit
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# Create a compressor object.
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b = io.BytesIO()
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g = deflate.DeflateIO(b, deflate.RAW, 15)
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# Then, use up most of the heap.
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l = []
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while True:
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try:
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l.append(bytearray(1000))
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except:
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break
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l.pop()
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# Try to compress. This will try to allocate a large window and fail.
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try:
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g.write('test')
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except MemoryError:
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print("MemoryError")
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# Should still be able to close the stream.
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g.close()
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# The underlying output stream should be unchanged.
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print(b.getvalue())
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