static int done = 0;
static void init_vlcs(FourXContext *f){    static int done = 0;    int i;    if (!done) {        done = 1;        for(i=0; i<4; i++){            init_vlc(&block_type_vlc[i], BLOCK_TYPE_VLC_BITS, 7,                      &block_type_tab[i][0][1], 2, 1,                     &block_type_tab[i][0][0], 2, 1);        }    }}