Merge pull request #18 from krassowski/warn-on-missing-crc

Allow to pass with a warning when CRC == 0

Author: krassowski

README.md

@@ -1,5 +1,5 @@
 # IPython data-vault
-[![tests](https://github.com/krassowski/data-vault/workflows/test/badge.svg)](https://github.com/krassowski/data-vault/actions?query=workflow%3test+branch%3Amaster)
+[![tests](https://github.com/krassowski/data-vault/workflows/tests/badge.svg)](https://github.com/krassowski/data-vault/actions/workflows/tests.yml)
 ![CodeQL](https://github.com/krassowski/data-vault/workflows/CodeQL/badge.svg)
 [![MIT License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat)](http://choosealicense.com/licenses/mit/)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/krassowski/data-vault/master?filepath=Example.ipynb)

data_vault/vault.py

@@ -4,6 +4,7 @@
 import hashlib
 from typing import Dict
 import zlib
+from warnings import warn
 
 from pandas import read_csv
 
@@ -122,7 +123,15 @@ def load_object(self, path, variable_name, importer=None, to_globals=True):
                 frame_manager.get_ipython_globals()[variable_name] = obj
 
         # check integrity of a single file
-        assert info.CRC == crc_as_int
+        if info.CRC != crc_as_int:
+            if info.CRC == 0:
+                # https://sourceforge.net/p/sevenzip/discussion/45798/thread/c284a85f3f/
+                warn(
+                    'CRC not found, cannot verify integrity (note:'
+                    ' this is expected for newer versions of 7zip when using AES encryption)'
+                )
+            else:
+                raise ValueError(f'CRC do not match: {info.CRC} { crc_as_int}')
 
         metadata = {
             'new_file': {