def has_string(stream, byteary):
    """Quick function to check if a stream contains a byteary"""
    if isinstance(byteary, str):
        byteary = byteary.encode('utf-8')
    import io
    buf_len = len(byteary)
    suffixes = [
        byteary[-i:]
        for i in range(3, buf_len)
        ]

    whole = io.BytesIO()
    while True:
        r = stream.read(buf_len*32)
        if not r:
            break
        whole.write(r)
        if any(suf in r for suf in suffixes):
            if byteary in whole.getvalue():
                return True
    return False