add a command line tool for dumping the contents of a capture file
diff --git a/src/storage.h b/src/storage.h
index df58ff9..d256fdc 100644
--- a/src/storage.h
+++ b/src/storage.h
@@ -30,3 +30,7 @@
 struct e1inp_ts;
 
 int e1frame_store(struct e1inp_ts *ts, struct msgb *msg, enum osmo_e1cap_capture_mode mode);
+
+struct osmo_e1cap_file;
+struct osmo_e1cap_file *osmo_e1cap_open(void *ctx, const char *path);
+struct osmo_e1cap_pkthdr *osmo_e1cap_read_next(struct osmo_e1cap_file *f);