From f5995474b141cc9d1da6ff2e14cd7ff97803eb86 Mon Sep 17 00:00:00 2001
From: "Dr. Chat" <arkolbed@gmail.com>
Date: Wed, 28 Sep 2016 18:33:25 -0500
Subject: [PATCH] Write the title ID to savestates - and disallow loading
 savestates from a different title for the moment.

---
 src/xenia/emulator.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/xenia/emulator.cc b/src/xenia/emulator.cc
index 2c5969de4..77c08217b 100644
--- a/src/xenia/emulator.cc
+++ b/src/xenia/emulator.cc
@@ -338,7 +338,7 @@ bool Emulator::SaveToFile(const std::wstring& path) {
 
   filesystem::CreateFile(path);
   auto map = MappedMemory::Open(path, MappedMemory::Mode::kReadWrite, 0,
-                                1024ull * 1024ull * 1024ull * 4ull);
+                                1024ull * 1024ull * 1024ull * 2ull);
   if (!map) {
     return false;
   }
@@ -346,6 +346,7 @@ bool Emulator::SaveToFile(const std::wstring& path) {
   // Save the emulator state to a file
   ByteStream stream(map->data(), map->size());
   stream.Write('XSAV');
+  stream.Write(title_id_);
 
   // It's important we don't hold the global lock here! XThreads need to step
   // forward (possibly through guarded regions) without worry!
@@ -379,6 +380,13 @@ bool Emulator::RestoreFromFile(const std::wstring& path) {
     return false;
   }
 
+  auto title_id = stream.Read<uint32_t>();
+  if (title_id != title_id_) {
+    // Swapping between titles is unsupported at the moment.
+    assert_always();
+    return false;
+  }
+
   if (!processor_->Restore(&stream)) {
     XELOGE("Could not restore processor!");
     return false;