-extern void sl_compress_init(/* struct slcompress * */);
-extern u_char sl_compress_tcp(/* struct mbuf *, struct ip *,
- struct slcompress *, int compress_cid_flag */);
-extern int sl_uncompress_tcp(/* u_char **, int, u_char, struct slcompress * */);
+void sl_compress_init __P((struct slcompress *));
+void sl_compress_setup __P((struct slcompress *, int));
+u_int sl_compress_tcp __P((struct mbuf *,
+ struct ip *, struct slcompress *, int));
+int sl_uncompress_tcp __P((u_char **, int, u_int, struct slcompress *));
+int sl_uncompress_tcp_core __P((u_char *, int, int, u_int,
+ struct slcompress *, u_char **, u_int *));