z_alloc
state->strm.zalloc = (alloc_func) z_alloc;
static void *z_alloc __P((void *, u_int items, u_int size));
state->strm.zalloc = (alloc_func)z_alloc;
state->strm.zalloc = (alloc_func)z_alloc;
static void *z_alloc(void *, uint_t items, uint_t size);