Function decode_template42_rust_from_params 

pub fn decode_template42_rust_from_params(
    path: &Path,
    width: usize,
    height: usize,
    num_points: usize,
    bits_per_sample: u8,
    block_size: u32,
    rsi: u32,
    flags_mask: u32,
    exp: i32,
    dec: i32,
    ref_val: f32,
) -> Result<Vec<f32>, String>

Read first Section7 payload and decode template 5.0=42 using it (convenience wrapper)