class ConvertError(Exception):
    '''
    Base exception for all coverter app exceptions
    '''
    pass


class UnknownFileFormat(ConvertError):
    '''
    Raised when the converter backend can't understand a file
    '''
    pass


class IdentifyError(ConvertError):
    '''
    Raised by the graphcismagick and imagemagics identify program
    '''
    pass


class UnkownConvertError(ConvertError):
    '''
    Raised when an error is found but there is no disernible way to
    identify the kind of error
    '''
    pass


class OfficeConversionError(ConvertError):
    pass


class OfficeBackendError(OfficeConversionError):
    pass