# -*- coding: utf-8 -*-

from system_tests import CaseMeta, path

class DenialOfServiceInAdjustTimeOverflow(metaclass=CaseMeta):

    """

    Regression test for the bug described in:

    https://github.com/Exiv2/exiv2/issues/851

    The date parsing code in XMPUtils::ConvertToDate does not

    check that the month and day are in bounds. This can cause a

    denial of service in AdjustTimeOverflow because it adjusts

    out-of-bounds days in a loop that subtracts one month per

    iteration.

    """

    url = "https://github.com/Exiv2/exiv2/issues/851"

    filename = path("$data_path/issue_851_poc.xmp")

    commands = ["$exiv2 $filename"]

    stdout = ["""File name       : $filename

File size       : 317 Bytes

MIME type       : application/rdf+xml

Image size      : 0 x 0

"""

]

    stderr = [

        """Warning: Failed to convert Xmp.xmp.CreateDate to Exif.Photo.DateTimeDigitized (Day is out of range)

$filename: No Exif data found in the file

"""]

    retval = [253]