mif_packed_test.py

#!/usr/bin/env python3

"""
Test packed format conversion
"""

import sys
import struct

try:
    import numpy as np
except ImportError:
    print("This tool requires package 'numpy'. Try: 'pip3 install numpy'")
    sys.exit(1)

try:
    import mif
except ImportError:
    print("This tool requires package 'mif'. Try: 'pip3 install mif'")
    sys.exit(1)

def main():
    """main"""

    expected_integer = 1920

    bindata = struct.pack(
        "<I", expected_integer
    )

    npdata = np.frombuffer(bindata, dtype=np.ubyte).reshape((-1, 4))

    result_integer1 = int.from_bytes(bytes(npdata[0]), byteorder="little")

    if expected_integer != result_integer1:
        print("Assertion fail!")
        sys.exit(1)

    mifstr = mif.dumps(npdata, packed=True, data_radix="HEX")
    _, data = mif.loads(mifstr, packed=True)

    result_integer2 = int.from_bytes(bytes(data[0]), byteorder="little")

    print("Expect:", expected_integer)
    print("Actual:", result_integer2)

    if expected_integer != result_integer2:
        print("Fail")
        sys.exit(1)

    print("Pass")

if __name__ == "__main__":
    main()

I made a mistake in the original version, setting dtype=np.byte, which is a signed character. This works correctly now with dtype=np.ubyte.