lib: add new stream function to reorganize buffer

The function was originally implemented for zebra data plane FPM plugin,
but another code places could use it.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/stream.h b/lib/stream.h
index 4f75f121c..dedbf3798 100644
--- a/lib/stream.h
+++ b/lib/stream.h
@@ -262,6 +262,16 @@ extern int stream_empty(struct stream *); /* is the stream empty? */
 /* debugging */
 extern void stream_hexdump(const struct stream *s);
 
+/**
+ * Reorganize the buffer data so it can fit more. This function is normally
+ * called right after stream data is consumed so we can read more data
+ * (the functions that consume data start with `stream_get*()` and macros
+ * `STREAM_GET*()`).
+ *
+ * \param s stream pointer.
+ */
+extern void stream_pulldown(struct stream *s);
+
 /* deprecated */
 extern uint8_t *stream_pnt(struct stream *);