endianess of resulting array of bytes #21

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1. besser82 commented on Nov 20, 2021

   

   besser82

   on Nov 20, 2021

   Last edited by besser82

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   The recent v8.10.2 also isn't working on big-endian architectures like s390x. So there must be some problems with the actual c-interface implementation:

   ======================================================================
   FAIL: test_pack (tests.test_c.CTest)
   Pack values.
   ----------------------------------------------------------------------
   Traceback (most recent call last):
     File "/builddir/build/BUILD/bitstruct-8.12.1/tests/test_c.py", line 97, in test_pack
       self.assertEqual(packed, b'\x3c\x00')
   AssertionError: b'\x00<' != b'<\x00'
   ======================================================================
   FAIL: test_unpack (tests.test_c.CTest)
   Unpack values.
   ----------------------------------------------------------------------
   Traceback (most recent call last):
     File "/builddir/build/BUILD/bitstruct-8.12.1/tests/test_c.py", line 187, in test_unpack
       self.assertEqual(unpacked, (1.0, ))
   AssertionError: Tuples differ: (3.5762786865234375e-06,) != (1.0,)
   First differing element 0:
   3.5762786865234375e-06
   1.0
   - (3.5762786865234375e-06,)
   + (1.0,)
   ----------------------------------------------------------------------
   Ran 51 tests in 0.006s
   FAILED (failures=2)
   

   👍React with 👍2Reacted by Erik Moqvist and Peter Lemenkov
2. lemenkov commented on Feb 16, 2026

   

   lemenkov

   on Feb 16, 2026

   Contributor

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   The recent v8.10.2 also isn't working on big-endian architectures like s390x. So there must be some problems with the actual c-interface implementation:

   ======================================================================
   FAIL: test_pack (tests.test_c.CTest)
   Pack values.
   ----------------------------------------------------------------------
   Traceback (most recent call last):
     File "/builddir/build/BUILD/bitstruct-8.12.1/tests/test_c.py", line 97, in test_pack
       self.assertEqual(packed, b'\x3c\x00')
   AssertionError: b'\x00<' != b'<\x00'
   ======================================================================
   FAIL: test_unpack (tests.test_c.CTest)
   Unpack values.
   ----------------------------------------------------------------------
   Traceback (most recent call last):
     File "/builddir/build/BUILD/bitstruct-8.12.1/tests/test_c.py", line 187, in test_unpack
       self.assertEqual(unpacked, (1.0, ))
   AssertionError: Tuples differ: (3.5762786865234375e-06,) != (1.0,)
   First differing element 0:
   3.5762786865234375e-06
   1.0
   - (3.5762786865234375e-06,)
   + (1.0,)
   ----------------------------------------------------------------------
   Ran 51 tests in 0.006s
   FAILED (failures=2)
   

   I guess this one fixed in my PR #55.