From ee1f772c391c8527f39988d6b9486bd5cc3df0a0 Mon Sep 17 00:00:00 2001
From: Thomas <thomas@thomasw.dev>
Date: Sun, 5 Nov 2023 04:54:12 +0100
Subject: [PATCH] Automatically detect surplus cartridge header

---
 src/bin/souper/main.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/bin/souper/main.rs b/src/bin/souper/main.rs
index 3491229..126a535 100644
--- a/src/bin/souper/main.rs
+++ b/src/bin/souper/main.rs
@@ -45,10 +45,17 @@ fn main() -> Result<()> {
     let args = Args::parse();
 
     let f = fs::read(args.filename)?;
+    let load_offset = match f.len() % 1024 {
+        0 => 0,
+        0x200 => {
+            println!("Cartridge contains 0x200 bytes of weird header");
+            0x200
+        },
+        _ => panic!("Illogical cartridge file size: 0x{:08X}", f.len()),
+    };
 
     let display = SDLRenderer::new(SCREEN_WIDTH, SCREEN_HEIGHT)?;
-
-    let bus = Mainbus::<SDLRenderer>::new(&f, args.bustrace, display);
+    let bus = Mainbus::<SDLRenderer>::new(&f[load_offset..], args.bustrace, display);
 
     let reset = bus.read16(0xFFFC);
     let mut cpu = Cpu65816::<Mainbus<SDLRenderer>>::new(bus, reset);