263     IPos hash_head = 0;
291 	INSERT_STRING(s, n, hash_head);
293     if (hash_head) hash_head = 0;  /* to make compiler happy */
1060     IPos hash_head = NIL; /* head of the hash chain */  in deflate_fast()  local
1081             INSERT_STRING(s, s->strstart, hash_head);  in deflate_fast()
1087         if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {  in deflate_fast()
1093                 s->match_length = longest_match (s, hash_head);  in deflate_fast()
1113                     INSERT_STRING(s, s->strstart, hash_head);  in deflate_fast()
1154     IPos hash_head = NIL;    /* head of hash chain */  in deflate_slow()  local
1176             INSERT_STRING(s, s->strstart, hash_head);  in deflate_slow()
1184         if (hash_head != NIL && s->prev_length < s->max_lazy_match &&  in deflate_slow()
1185             s->strstart - hash_head <= MAX_DIST(s)) {  in deflate_slow()
1191                 s->match_length = longest_match (s, hash_head);  in deflate_slow()
1226                     INSERT_STRING(s, s->strstart, hash_head);  in deflate_slow()