|
|
- import re
-
-
- class InvalidVersionError(Exception):
- pass
-
-
- def get_version(filename):
- """
- Determines what version the ND2 is.
-
- :param filename: the path (absolute or relative) to the ND2
- :type filename: str
-
- """
- with open(filename, 'rb') as f:
- # the first 16 bytes seem to have no meaning, so we skip them
- f.seek(16)
- # the next 38 bytes contain the string that we want to parse. Unlike most of the ND2, this is in UTF-8
- data = f.read(38).decode("utf8")
- return parse_version(data)
-
-
- def parse_version(data):
- """
- Parses a string with the version data in it.
-
- :param data: the 19th through 54th byte of the ND2, representing the version
- :type data: unicode
-
- """
- match = re.search(r"""^ND2 FILE SIGNATURE CHUNK NAME01!Ver(?P<major>\d)\.(?P<minor>\d)$""", data)
- if match:
- # We haven't seen a lot of ND2s but the ones we have seen conform to this
- return int(match.group('major')), int(match.group('minor'))
- raise InvalidVersionError("The version of the ND2 you specified is not supported.")
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