Fix example in README

[treiher]

The example in the README leads to an exception:

  File "/tmp/.venv/lib/python3.11/site-packages/cobrafuzz/fuzzer.py", line 187, in _worker_run                                                                
    target(bytes(data))                                                                                                                                                     
  File "/tmp/test.py", line 10, in fuzz                                                                                                                       
    parser = HTMLParser()                                                                                                                                                   
             ^^^^^^^^^^                                                                                                                                                     
NameError: name 'HTMLParser' is not defined

Here is a fixed version:

from cobrafuzz.main import CobraFuzz


@CobraFuzz
def fuzz(buf: bytes) -> None:
    from html.parser import HTMLParser

    try:
        string = buf.decode("ascii")
        parser = HTMLParser()
        parser.feed(string)
    except UnicodeDecodeError:
        pass


if __name__ == "__main__":
    fuzz()

Apart from moving the import inside the function, I have also added type hints. That makes it more obvious what the type of buf is.

[senier]

Thanks @treiher for the report and the fix! Sorry for the delayed response - for some reason I received no notification for this issue.

The example in the README actually used to be the same as examples/fuzz_htmlparser/fuzz.py, but I forgot to update it when changing the fuzzer. I fixed it and implemented a check in #50 to ensure the code example in the README remains in sync.