From 11cf0dc5606b09cfbb656446922d4e0e74bbb346 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Thu, 13 Jan 2022 03:05:36 -0500
Subject: [PATCH] prevent saving unsupported systems to .dmf

---
 src/engine/engine.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 96da3c293..fd99aa5c2 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -1772,8 +1772,8 @@ SafeWriter* DivEngine::saveFur() {
 SafeWriter* DivEngine::saveDMF() {
   // fail if more than one system
   if (song.systemLen!=1) {
-    logE("cannot save multiple systems in this format!\n");
-    lastError="multiple systems not possible on .dmf";
+    logE("cannot save multiple platforms in this format!\n");
+    lastError="multiple platforms not possible on .dmf";
     return NULL;
   }
   // fail if this is an YMU759 song
@@ -1782,6 +1782,12 @@ SafeWriter* DivEngine::saveDMF() {
     lastError="YMU759 song saving is not supported";
     return NULL;
   }
+  // fail if the system is Furnace-exclusive
+  if (systemToFile(song.system[0])&0x80) {
+    logE("cannot save Furnace-exclusive platform song!\n");
+    lastError="this platform is not possible on .dmf";
+    return NULL;
+  }
 
   SafeWriter* w=new SafeWriter;
   w->init();