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import re
from nd2reader.exc import InvalidVersionError
def get_version(fh):
"""
Determines what version the ND2 is.
:param fh: an open file handle to the ND2
:type fh: file
"""
# the first 16 bytes seem to have no meaning, so we skip them
fh.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 = fh.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.")