Function root_io::core::parsers::parse_custom_mantissa

pub fn parse_custom_mantissa<'s, E>(
    input: &'s [u8], 
    nbits: usize
) -> IResult<&[u8], f32, E> where
    E: ParseError<&'s [u8]> + Debug, 

Some Double_* values are saved with a custom mantissa... The number of bytes can be found in the comment string of the generated YAML code (for ALICE ESD files at least). This function reconstructs a float from the exponent and mantissa