Function jerasure_bitmatrix_encode 

pub unsafe extern "C" fn jerasure_bitmatrix_encode(
    k: c_int,
    m: c_int,
    w: c_int,
    bitmatrix: *mut c_int,
    data_ptrs: *mut *mut c_char,
    coding_ptrs: *mut *mut c_char,
    size: c_int,
    packetsize: c_int,
)