Function jerasure_matrix_encode 

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