dw_read_buf
error = dw_read_buf(dwbuf, &dav->dav_buf, dav->dav_u8);
error = dw_read_buf(dwbuf, &dav->dav_buf, dav->dav_u16);
error = dw_read_buf(dwbuf, &dav->dav_buf, dav->dav_u32);
error = dw_read_buf(dwbuf, &dav->dav_buf, dav->dav_u64);
static int dw_read_buf(struct dwbuf *, struct dwbuf *, size_t);
if (dw_read_buf(info, &dwbuf, length))