import system_tests

class IntegerOverflowInPngImageReadMetadata(

        metaclass=system_tests.CaseMeta):

    """

    Regression test for the bug described in:

    https://github.com/Exiv2/exiv2/issues/790

    Due to an integer overflow bug (#790), this test triggers an 8GB

    memory allocation. So the test will fail with a std::bad_alloc

    exception if less than 8GB is available.  On Linux, you can use

    `ulimit -v 8000000` to reduce the available memory to slightly

    less than 8GB.

    """

    url = "https://github.com/Exiv2/exiv2/issues/790"

    filename = system_tests.path(

        "$data_path/issue_790_poc2.png"

    )

    commands = ["$exiv2 $filename"]

    stdout = [""]

    stderr = ["""Exiv2 exception in print action for file $filename:

corrupted image metadata

"""

]

    retval = [1]