Function extract_bit_action_parameter 

pub fn extract_bit_action_parameter(
    parameter_data: &[u8],
    offset: usize,
    size: usize,
) -> BitVec<u8, Msb0>

Extract a bit<size> action parameter from the control-plane action data.

Action data lays out each parameter in declaration order as size.div_ceil(8) little-endian bytes, starting at offset. x4c keeps every numeric value little-endian inside a program (header fields are byte-reversed on parse and once again on deparse), so the control plane passes these values into this representation with no conversion necessary; the same is true for exact and range keys.

The returned vector has the same layout as bitvec_resize output and header fields of the same width, so load_le recovers the value whenever the width fits the target integer (up to 128 bits for u128).