fn parse_unit_header<R, Offset>(
    input: &mut R,
    unit_offset: UnitSectionOffset<Offset>,
) -> Result<UnitHeader<R>>where
    R: Reader<Offset = Offset>,
    Offset: ReaderOffset,Expand description
Parse a unit header.
fn parse_unit_header<R, Offset>(
    input: &mut R,
    unit_offset: UnitSectionOffset<Offset>,
) -> Result<UnitHeader<R>>where
    R: Reader<Offset = Offset>,
    Offset: ReaderOffset,Parse a unit header.