From dd682c6da15a0c4d923dc7a1ac0ed77616438a13 Mon Sep 17 00:00:00 2001
From: Markus Birth <mbirth@gmail.com>
Date: Sat, 12 Oct 2019 19:32:22 +0200
Subject: [PATCH] Start work on parsing firmware payload.

---
 grmn/rgn.py    | 7 ++++++-
 grmn/rgnbin.py | 7 +++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/grmn/rgn.py b/grmn/rgn.py
index dc60e65..8a601ba 100644
--- a/grmn/rgn.py
+++ b/grmn/rgn.py
@@ -264,9 +264,14 @@ class RgnRecordR(RgnRecord):
             txt += " (OK)"
         else:
             txt += " (" + RED + "MISMATCH!" + RESET + ")"
-        if self.id_payload() == "RGN":
+        payload_type = self.id_payload()
+        if payload_type == "RGN":
             txt += "\n  " + YELLOW + "PAYLOAD IS ANOTHER RGN STRUCTURE:" + RESET
             rgn = Rgn()
             rgn.load_from_bytes(self.payload[10:])
             txt += "\n      " + "\n      ".join(str(rgn).split("\n"))
+        elif payload_type == "BIN":
+            binfw = RgnBin()
+            binfw.load_from_bytes(self.payload[10:])
+            txt += "\n      " + "\n      ".join(str(binfw).split("\n"))
         return txt
diff --git a/grmn/rgnbin.py b/grmn/rgnbin.py
index f71ee67..453e37e 100644
--- a/grmn/rgnbin.py
+++ b/grmn/rgnbin.py
@@ -25,4 +25,11 @@ class RgnBin:
         if self.filename is None:
             return False
         with open(self.filename, "rb") as f:
+            rawdata = f.read()
             f.close()
+        self.load_from_bytes(rawdata)
+
+    def load_from_bytes(self, payload: bytes):
+        print(repr(payload[0:10]))
+        jmp = unpack("<L", payload[0:4])[0]
+        print("{:08x}".format(jmp))