PSFLoader: Detect region from exe

src/core/bios.cpp

@@ -252,4 +252,20 @@ bool IsValidPSExeHeader(const PSEXEHeader& header, u32 file_size)
   return true;
 }
 
+DiscRegion GetPSExeDiscRegion(const PSEXEHeader& header)
+{
+  static constexpr char ntsc_u_id[] = "Sony Computer Entertainment Inc. for North America area";
+  static constexpr char ntsc_j_id[] = "Sony Computer Entertainment Inc. for Japan area";
+  static constexpr char pal_id[] = "Sony Computer Entertainment Inc. for Europe area";
+
+  if (std::memcmp(header.marker, ntsc_u_id, sizeof(ntsc_u_id) - 1) == 0)
+    return DiscRegion::NTSC_U;
+  else if (std::memcmp(header.marker, ntsc_j_id, sizeof(ntsc_j_id) - 1) == 0)
+    return DiscRegion::NTSC_J;
+  else if (std::memcmp(header.marker, pal_id, sizeof(pal_id) - 1) == 0)
+    return DiscRegion::PAL;
+  else
+    return DiscRegion::Other;
+}
+
 } // namespace BIOS

src/core/bios.h

@@ -69,4 +69,5 @@ bool PatchBIOSFastBoot(u8* image, u32 image_size, const Hash& hash);
 bool PatchBIOSForEXE(u8* image, u32 image_size, u32 r_pc, u32 r_gp, u32 r_sp, u32 r_fp);
 
 bool IsValidPSExeHeader(const PSEXEHeader& header, u32 file_size);
+DiscRegion GetPSExeDiscRegion(const PSEXEHeader& header);
 } // namespace BIOS

src/core/psf_loader.cpp

@@ -1,4 +1,5 @@
 #include "psf_loader.h"
+#include "bios.h"
 #include "common/assert.h"
 #include "common/file_system.h"
 #include "common/log.h"
@@ -159,6 +160,16 @@ bool File::Load(const char* path)
     }
   }
 
+  // Region detection.
+  m_region = BIOS::GetPSExeDiscRegion(*reinterpret_cast<const BIOS::PSEXEHeader*>(m_program_data.data()));
+
+  // _refresh tag takes precedence.
+  const int refresh_tag = GetTagInt("_region", 0);
+  if (refresh_tag == 60)
+    m_region = DiscRegion::NTSC_U;
+  else if (refresh_tag == 50)
+    m_region = DiscRegion::PAL;
+
   return true;
 }
 

src/core/psf_loader.h

@@ -27,6 +27,7 @@ public:
 
   ALWAYS_INLINE const ProgramData& GetProgramData() const { return m_program_data; }
   ALWAYS_INLINE const TagMap& GetTagMap() const { return m_tags; }
+  ALWAYS_INLINE DiscRegion GetRegion() const { return m_region; }
 
   std::optional<std::string> GetTagString(const char* tag_name) const;
   std::optional<int> GetTagInt(const char* tag_name) const;
@@ -46,6 +47,7 @@ private:
 
   ProgramData m_program_data;
   TagMap m_tags;
+  DiscRegion m_region = DiscRegion::Other;
 };
 
 bool Load(const char* path);