- /* copy dictionary to window */
- if (updatewindow(strm, strm->avail_out)) {
+ /* copy dictionary to window using updatewindow(), which will amend the
+ existing dictionary if appropriate */
+ next = strm->next_out;
+ avail = strm->avail_out;
+ strm->next_out = (Bytef *)dictionary + dictLength;
+ strm->avail_out = 0;
+ ret = updatewindow(strm, dictLength);
+ strm->avail_out = avail;
+ strm->next_out = next;
+ if (ret) {