core: Support LayeredFS mod from SDMC directory

Enables loading a mod directly from `[yuzu data
directory]/sdmc/atmosphere/contents/[title_id]`. For use with some
homebrew mod managers.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/core/file_sys/sdmc_factory.cpp b/src/core/file_sys/sdmc_factory.cpp
index cb56d8f2d..f4dba8f16 100644
--- a/src/core/file_sys/sdmc_factory.cpp
+++ b/src/core/file_sys/sdmc_factory.cpp
@@ -27,6 +27,13 @@ ResultVal<VirtualDir> SDMCFactory::Open() const {
     return MakeResult<VirtualDir>(dir);
 }
 
+VirtualDir SDMCFactory::GetSDMCModificationLoadRoot(u64 title_id) const {
+    // LayeredFS doesn't work on updates and title id-less homebrew
+    if (title_id == 0 || (title_id & 0xFFF) == 0x800)
+        return nullptr;
+    return GetOrCreateDirectoryRelative(dir, fmt::format("/atmosphere/contents/{:016X}", title_id));
+}
+
 VirtualDir SDMCFactory::GetSDMCContentDirectory() const {
     return GetOrCreateDirectoryRelative(dir, "/Nintendo/Contents");
 }