From 36c92294dfcb2605b29bcc12e69526e904887818 Mon Sep 17 00:00:00 2001
From: JosJuice <josjuice@gmail.com>
Date: Mon, 16 Mar 2020 15:19:08 +0100
Subject: [PATCH] Boot: Preserve CODE value in setting.txt if it already
 matches the region

This is a part of fixing https://bugs.dolphin-emu.org/issues/11930.
---
 Source/Core/Core/Boot/Boot_BS2Emu.cpp | 38 +++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/Source/Core/Core/Boot/Boot_BS2Emu.cpp b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
index a85a939e79..8f8f630e80 100644
--- a/Source/Core/Core/Boot/Boot_BS2Emu.cpp
+++ b/Source/Core/Core/Boot/Boot_BS2Emu.cpp
@@ -242,6 +242,30 @@ bool CBoot::EmulatedBS2_GC(const DiscIO::VolumeDisc& volume)
   return RunApploader(/*is_wii*/ false, volume);
 }
 
+static DiscIO::Region CodeRegion(char c)
+{
+  switch (c)
+  {
+  case 'J':  // Japan
+  case 'T':  // Taiwan
+    return DiscIO::Region::NTSC_J;
+  case 'B':  // Brazil
+  case 'M':  // Middle East
+  case 'R':  // Argentina
+  case 'S':  // ???
+  case 'U':  // USA
+  case 'W':  // ???
+    return DiscIO::Region::NTSC_U;
+  case 'A':  // Australia
+  case 'E':  // Europe
+    return DiscIO::Region::PAL;
+  case 'K':  // Korea
+    return DiscIO::Region::NTSC_K;
+  default:
+    return DiscIO::Region::Unknown;
+  }
+}
+
 bool CBoot::SetupWiiMemory(IOS::HLE::IOSC::ConsoleType console_type)
 {
   static const std::map<DiscIO::Region, const RegionSetting> region_settings = {
@@ -267,11 +291,25 @@ bool CBoot::SetupWiiMemory(IOS::HLE::IOSC::ConsoleType console_type)
     {
       gen.SetBytes(std::move(data));
       serno = gen.GetValue("SERNO");
+
+      bool region_matches = false;
       if (SConfig::GetInstance().bOverrideRegionSettings)
+      {
+        region_matches = true;
+      }
+      else
+      {
+        const std::string code = gen.GetValue("CODE");
+        if (code.size() >= 2 && CodeRegion(code[1]) == SConfig::GetInstance().m_region)
+          region_matches = true;
+      }
+
+      if (region_matches)
       {
         region_setting = RegionSetting{gen.GetValue("AREA"), gen.GetValue("VIDEO"),
                                        gen.GetValue("GAME"), gen.GetValue("CODE")};
       }
+
       gen.Reset();
     }
   }