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How to use calculate_crc32 method in localstack

Best Python code snippet using localstack_python

rcrc32.py

Source:rcrc32.py

...27        **kwargs28    )29def fcrc32(value):30    return '{:0>8X}'.format(value)31def calculate_crc32(path):32    logger.debug('Calculating the CRC32 of "%s"', path)33    csum = 034    with open(path, 'rb') as f:35        while True:36            chunk = f.read(1 << 16)37            if not chunk:38                break39            csum = zlib.crc32(chunk, csum)40    return csum & 0xffffffff41def extract_crc32(file_name):42    match = CRC32_PATTERN.search(file_name)43    return None if match is None else int(match.group(1), 16)44def list_files(paths):45    result = []46    for path in paths:47        _list_files(path, os.stat(path), result)48    return result49def _list_files(path, st, result):50    if stat.S_ISDIR(st.st_mode):51        with os.scandir(path) as it:52            for entry in it:53                _list_files(entry.path, entry.stat(), result)54    else:55        root, fname = os.path.split(path)56        result.append((root, fname, st.st_size))57def filter_randomly(files, percentage):58    size_sum = sum(f[2] for f in files)59    logger.debug("The total file size is %d", size_sum)60    size_limit = max(int(size_sum * (percentage / 100.0)), 1)61    result_size = 062    result = []63    while files and result_size < size_limit:64        i = random.randrange(len(files))65        logger.debug("Adding the file '%s/%s' with size %d", files[i][0], files[i][1], files[i][2])66        result_size += files[i][2]67        result.append(files[i])68        files[i] = files[-1]69        files.pop()70    logger.debug("The result file size is %d of %d (%f%%)", result_size, size_sum, 100.0 * result_size / size_sum)71    return result72def filter_extensions(files, extensions):73    result = []74    for f in files:75        name, ext = os.path.splitext(f[1])76        if ext.lower() in extensions:77            result.append(f)78    return result79def filter_name_crc32(files):80    return [f for f in files if extract_crc32(f[1]) is not None]81def create_arg_parser():82    p = ArgumentParser(description='A recursive CRC32',83                       formatter_class=ArgumentDefaultsHelpFormatter)84    p.add_argument('paths', nargs='*',85                   help='the paths to analize, it could be a file or a directory')86    p.add_argument('--log-level', default='INFO',87                   choices=('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'),88                   help='logger level')89    p.add_argument('--add', action='store_true',90                   help='add the CRC32 to the files without it')91    p.add_argument('--check', action='store_true',92                   help='calculate only the CRC32 of the files with it in the name')93    p.add_argument('--only-corrupt', action='store_true',94                   help='show only the corrupt files')95    p.add_argument('--random', type=type_random, default=None,96                   help='apply randomly to this percentage of the files size')97    p.add_argument('--extension', '-e', nargs='*', default=('.mp4', '.avi', '.mkv'),98                   help='apply only to files with this extensions')99    return p100def type_random(x):101    try:102        return max(0.0, min(float(x), 100.0))103    except ValueError:104        raise ArgumentTypeError("The random percentage must be a valid number")105def main():106    parser = create_arg_parser()107    args = parser.parse_args()108    logging.basicConfig(level=args.log_level)109    logger.debug("Listing files")110    files = list_files(args.paths)111    extensions = set(x.lower() for x in args.extension if x)112    if extensions:113        logger.debug("Filtering files by extension")114        files = filter_extensions(files, extensions)115    if not args.add:116        logger.debug("Filtering files with name CRC32")117        files = filter_name_crc32(files)118    if args.random is not None:119        logger.debug("Filtering files randomly")120        files = filter_randomly(files, args.random)121    corrupted_file = False122    error_adding_crc32 = False123    logger.debug("Doing operations")124    files.sort()125    for root, fname, _ in files:126        path = os.path.join(root, fname)127        name_crc32 = extract_crc32(fname)128        if name_crc32 is None and args.add:129            crc32 = calculate_crc32(path)130            name, ext = os.path.splitext(fname)131            new_fname = "{} [{}]{}".format(name, fcrc32(crc32), ext)132            new_path = os.path.join(root, new_fname)133            logger.debug("Renaming the file '%s' to '%s'", path, new_path)134            try:135                os.rename(path, new_path)136            except OSError:137                logger.exception("Can't rename '%s' to '%s'", path, new_path)138                error_adding_crc32 = True139                continue140            cprint('{_bold}{_lblue}NEW{_reset} {} {}', fcrc32(crc32), new_path)141        elif name_crc32 is not None and args.check:142            crc32 = calculate_crc32(path)143            if crc32 != name_crc32:144                cprint('{_bold}{_lred}CORRUPT{_reset} {} {}', fcrc32(crc32), path)145                corrupted_file = True146            elif not args.only_corrupt:147                cprint('{_bold}{_lgreen}HEALTHY{_reset} {} {}', fcrc32(crc32), path)148    if corrupted_file:149        return 1150    if error_adding_crc32:151        return 2152    return 0153if __name__ == "__main__":...

test_checksum_crc32_iso_hdlc.py

Source:test_checksum_crc32_iso_hdlc.py

...33        ),34    ]35    for crc_entry in crc_data_list:36        # check expected result from first execution37        test_result = crc32_handler.calculate_crc32(crc_entry.test_data)38        test_result_str = convert_int_to_hex_string(test_result)39        assert test_result == crc_entry.expected_int40        assert test_result_str == crc_entry.expected_str41        # check if result is the same after second execution42        test_result = crc32_handler.calculate_crc32(crc_entry.test_data)43        test_result_str = convert_int_to_hex_string(test_result)44        assert test_result == crc_entry.expected_int45        assert test_result_str == crc_entry.expected_str46@pytest.mark.unittest47def test_checksum_calculate_crc32_iso_hdlc_to_match_zlib_result():48    test_data_array = [49        b"",50        b" ",51        b"123456789",52        b"123",53        b"Hello Python",54        b"Secret123@123#!",55        b"\xAA\xBB",56        b"\x00\x01\x02\x03",57        b"1",58        b"abcdefgh",59        b"\n",60        b"!@#$%^&*()",61        fake.binary(length=100),62        fake.binary(length=5000),63    ]64    for test_data in test_data_array:65        test_result = crc32_handler.calculate_crc32(test_data)66        zlib_result = zlib.crc32(test_data)67        test_result_str = convert_int_to_hex_string(test_result)68        zlib_result_str = convert_int_to_hex_string(zlib_result)69        assert test_result == zlib_result...

sys573_config_tool.py

Source:sys573_config_tool.py

1import argparse23def decrypt_data_internal(data, key):4    def calculate_crc32(input):5        crc = -167        for c in bytearray(input, encoding='ascii'):8            crc ^= c << 24910            for _ in range(8):11                if crc & 0x80000000:12                    crc = (crc << 1) ^ 0x4C11DB713                else:14                    crc <<= 11516        return crc1718    decryption_key = calculate_crc32(key)1920    for i in range(len(data)):21        data[i] ^= (decryption_key >> 8) & 0xff # This 8 can be variable it seems, but it usually is 8?2223    return data242526def main():27    parser = argparse.ArgumentParser()2829    parser.add_argument('--insert', help='Input configuration text into output file', default=False, action='store_true')3031    args = parser.parse_args()32
...

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