diff --git a/lib/stream.h b/lib/stream.h
new file mode 100644
index 0000000..c6ef3c8
--- /dev/null
+++ b/lib/stream.h
@@ -0,0 +1,113 @@
+/*
+ * Packet interface
+ * Copyright (C) 1999 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  
+ */
+
+#ifndef _ZEBRA_STREAM_H
+#define _ZEBRA_STREAM_H
+
+/* Stream buffer. */
+struct stream
+{
+  struct stream *next;
+
+  unsigned char *data;
+  
+  /* Put pointer. */
+  unsigned long putp;
+
+  /* Get pointer. */
+  unsigned long getp;
+
+  /* End of pointer. */
+  unsigned long endp;
+
+  /* Data size. */
+  unsigned long size;
+};
+
+/* First in first out queue structure. */
+struct stream_fifo
+{
+  unsigned long count;
+
+  struct stream *head;
+  struct stream *tail;
+};
+
+/* Utility macros. */
+#define STREAM_PNT(S)   ((S)->data + (S)->getp)
+#define STREAM_SIZE(S)  ((S)->size)
+#define STREAM_REMAIN(S) ((S)->size - (S)->putp)
+#define STREAM_DATA(S)  ((S)->data)
+
+/* Stream prototypes. */
+struct stream *stream_new (size_t);
+void stream_free (struct stream *);
+
+unsigned long stream_get_getp (struct stream *);
+unsigned long stream_get_putp (struct stream *);
+unsigned long stream_get_endp (struct stream *);
+unsigned long stream_get_size (struct stream *);
+u_char *stream_get_data (struct stream *);
+
+void stream_set_getp (struct stream *, unsigned long);
+void stream_set_putp (struct stream *, unsigned long);
+
+void stream_forward (struct stream *, int);
+
+void stream_put (struct stream *, void *, size_t);
+int stream_putc (struct stream *, u_char);
+int stream_putc_at (struct stream *, unsigned long, u_char);
+int stream_putw (struct stream *, u_int16_t);
+int stream_putw_at (struct stream *, unsigned long, u_int16_t);
+int stream_putl (struct stream *, u_int32_t);
+int stream_putl_at (struct stream *, unsigned long, u_int32_t);
+int stream_put_ipv4 (struct stream *, u_int32_t);
+int stream_put_in_addr (struct stream *, struct in_addr *);
+
+void stream_get (void *, struct stream *, size_t);
+u_char stream_getc (struct stream *);
+u_char stream_getc_from (struct stream *, unsigned long);
+u_int16_t stream_getw (struct stream *);
+u_int16_t stream_getw_from (struct stream *, unsigned long);
+u_int32_t stream_getl (struct stream *);
+u_int32_t stream_get_ipv4 (struct stream *);
+
+#undef stream_read
+#undef stream_write
+int stream_read (struct stream *, int, size_t);
+int stream_read_unblock (struct stream *, int, size_t);
+int stream_write (struct stream *, u_char *, size_t);
+
+u_char *stream_pnt (struct stream *);
+void stream_reset (struct stream *);
+int stream_flush (struct stream *, int);
+int stream_empty (struct stream *);
+
+/* Stream fifo. */
+struct stream_fifo *stream_fifo_new ();
+void stream_fifo_push (struct stream_fifo *fifo, struct stream *s);
+struct stream *stream_fifo_pop (struct stream_fifo *fifo);
+struct stream *stream_fifo_head (struct stream_fifo *fifo);
+void stream_fifo_clean (struct stream_fifo *fifo);
+void stream_fifo_free (struct stream_fifo *fifo);
+
+#endif /* _ZEBRA_STREAM_H */