From a529adc9652708c4433b88b26d9b991bfe25c756 Mon Sep 17 00:00:00 2001
From: nxxxse <37087724+nxxxse@users.noreply.github.com>
Date: Sun, 19 Oct 2025 18:41:21 +0200
Subject: [PATCH] Make fw_decrypt.py work for Lexmark LW Firmware versions

Tested with:

LW63.GM7.P638.zip
LW80.GM7.P210.zip
LW90.GM7.P207.zip
LW90.GM7.P218.zip

https://www.lexmark.com/en_us/technical-support/solution-versions.html
---
 tools/fw_decrypt.py | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/tools/fw_decrypt.py b/tools/fw_decrypt.py
index 6b30aa6..bccbee6 100644
--- a/tools/fw_decrypt.py
+++ b/tools/fw_decrypt.py
@@ -4,6 +4,8 @@
 import os
 import struct
 import binascii
+import re
+
 from Crypto.Cipher import AES
 
 DEFAULT_KEY_INDEX = 2
@@ -99,13 +101,16 @@ def parse_pjl_header(self):
         a = self.fh.readline()
         if a != b"\x1b%-12345X@PJL \n":
             self.err("invalid header line")
-        pjl_line_a = self.fh.readline().decode("utf8")
-        pjl_line_b = self.fh.readline().decode("utf8")
 
-        if not pjl_line_a.startswith("@PJL") or not pjl_line_b.startswith("@PJL"):
-            self.err("invalid PJL header line")
+        while True:
+            pjl_line_a = self.fh.readline().decode("utf8")
+            if not pjl_line_a.startswith("@PJL"):
+                self.err("invalid PJL header line")
+            if pjl_line_a.startswith("@PJL LPROGRAMRIP"):
+                # Skip over one or many COMMENT.
+                break
 
-        parts = pjl_line_b.split(" ")
+        parts = pjl_line_a.split(" ")
         if parts[1] != "LPROGRAMRIP":
             self.err("unexpected pjl instruction '%s'" % parts[1])
 
@@ -115,6 +120,9 @@ def parse_pjl_header(self):
             name, value = parts[i].split("=", 1)
             if value.startswith('"'):
                 self.pjl_properties[name] = value[1 : len(value) - 1]
+            elif re.search(r'^[a-z][a-z0-9]+$', value, re.IGNORECASE):
+                # Parse: TYPE=MAIN
+                self.pjl_properties[name] = value
             else:
                 self.pjl_properties[name] = int(value, 0)