Commit: a7d73a21e5348e7d47089874bcb12c618d6f6cb9
Parent: 4b5c34cd8a945d0aa48de17aecd10874391b6161
Author: Vi Grey
Date: 2018-02-01 12:33 UTC
Summary: Add safety buffer for end of zero padding of PRG

 neszip.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


diff --git a/neszip.py b/neszip.py
index 03c1a31..16e1ac7 100755
--- a/neszip.py
+++ b/neszip.py
@@ -79,7 +79,8 @@ def reoffset_zip(n, z, i):
 def create_polyglot(n, z):
     new_nes_contents = b''
     if len(n) - 8208 >= 16384:
-      i = n.rfind(b'\x00' * len(z), 16, 16400)
+      # 16392 gives an 8 byte buffer for end of PRG
+      i = n.rfind(b'\x00' * len(z), 16, 16392)
       if i != -1:
           new_nes_contents += n[:i]
           z_reoffset = reoffset_zip(n, z, i)