From 6e2d51d46d303145d4b1896f0ac5bc182824e9af Mon Sep 17 00:00:00 2001
From: Winston Olson-Duvall <winston.olson-duvall@jpl.nasa.gov>
Date: Mon, 29 Aug 2022 08:53:12 -0700
Subject: [PATCH] Add utility for checking packet sequence

---
 util/packet_sequence_check.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 util/packet_sequence_check.py

diff --git a/util/packet_sequence_check.py b/util/packet_sequence_check.py
new file mode 100644
index 0000000..c155d51
--- /dev/null
+++ b/util/packet_sequence_check.py
@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+
+import argparse
+
+import emit.data_products as dp
+
+HOSC_HEADER_LEN = 28
+
+parser = argparse.ArgumentParser()
+parser.add_argument("infile")
+args = parser.parse_args()
+
+in_file = open(args.infile, "rb")
+prev_psc = 0
+count = 0
+
+with open(in_file, "rb") as f:
+    while True:
+        try:
+            # Read hosc header
+            hosc_header = f.read(HOSC_HEADER_LEN)
+            # Read a packet
+            pkt = dp.CCSDSPacket(stream=f)
+            if (prev_psc + 1) % 16384 != pkt.pkt_seq_cnt and count > 0:
+                print(f"Out of order - prev_psc is {prev_psc}, current psc is {pkt.pkt_seq_cnt}")
+                print(pkt)
+            count += 1
+        except EOFError:
+            break
+
+print(f"Total packets: {count}")