core: Add dump RomFS support

This is added to LayeredFS, then the NCCH container and then the loader interface.

src/core/loader/loader.h

@@ -186,6 +186,15 @@ public:
         return ResultStatus::ErrorNotImplemented;
     }
 
+    /**
+     * Dump the RomFS of the applciation
+     * @param target_path The target path to dump to
+     * @return ResultStatus result of function
+     */
+    virtual ResultStatus DumpRomFS(const std::string& target_path) {
+        return ResultStatus::ErrorNotImplemented;
+    }
+
     /**
      * Get the update RomFS of the application
      * Since the RomFS can be huge, we return a file reference instead of copying to a buffer
@@ -196,6 +205,15 @@ public:
         return ResultStatus::ErrorNotImplemented;
     }
 
+    /**
+     * Dump the update RomFS of the applciation
+     * @param target_path The target path to dump to
+     * @return ResultStatus result of function
+     */
+    virtual ResultStatus DumpUpdateRomFS(const std::string& target_path) {
+        return ResultStatus::ErrorNotImplemented;
+    }
+
     /**
      * Get the title of the application
      * @param title Reference to store the application title into

src/core/loader/ncch.cpp

@@ -254,6 +254,18 @@ ResultStatus AppLoader_NCCH::ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReade
     return ResultStatus::Success;
 }
 
+ResultStatus AppLoader_NCCH::DumpRomFS(const std::string& target_path) {
+    return base_ncch.DumpRomFS(target_path);
+}
+
+ResultStatus AppLoader_NCCH::DumpUpdateRomFS(const std::string& target_path) {
+    u64 program_id;
+    ReadProgramId(program_id);
+    update_ncch.OpenFile(Service::AM::GetTitleContentPath(Service::FS::MediaType::SDMC,
+                                                          program_id | UPDATE_MASK));
+    return update_ncch.DumpRomFS(target_path);
+}
+
 ResultStatus AppLoader_NCCH::ReadTitle(std::string& title) {
     std::vector<u8> data;
     Loader::SMDH smdh;

src/core/loader/ncch.h

@@ -59,6 +59,10 @@ public:
 
     ResultStatus ReadUpdateRomFS(std::shared_ptr<FileSys::RomFSReader>& romfs_file) override;
 
+    ResultStatus DumpRomFS(const std::string& target_path) override;
+
+    ResultStatus DumpUpdateRomFS(const std::string& target_path) override;
+
     ResultStatus ReadTitle(std::string& title) override;
 
 private: