Filesystem/Archives: Implemented the SaveData archive

The savedata for each game is stored in /savedata/<ProgramID> for NCCH files. ELF files and 3DSX files use the folder 0 because they have no ID information

Got rid of the code duplication in File and Directory

Files that deal with the host machine's file system now live in DiskFile, similarly for directories and DiskDirectory and archives with DiskArchive.

FS_U: Use the correct error code when a file wasn't found

3 files changed, 11 insertions, 0 deletions

diff --git a/src/core/loader/loader.cpp b/src/core/loader/loader.cpp
index 463dacca3..480274d23 100644
--- a/src/core/loader/loader.cpp
+++ b/src/core/loader/loader.cpp
@@ -74,6 +74,7 @@ ResultStatus LoadFile(const std::string& filename) {
 
         // Load application and RomFS
         if (ResultStatus::Success == app_loader.Load()) {
+            Kernel::g_program_id = app_loader.GetProgramId();
             Service::FS::CreateArchive(std::make_unique<FileSys::Archive_RomFS>(app_loader), Service::FS::ArchiveIdCode::RomFS);
             return ResultStatus::Success;
         }
diff --git a/src/core/loader/ncch.cpp b/src/core/loader/ncch.cpp
index ba9ba00c0..4d23656ec 100644
--- a/src/core/loader/ncch.cpp
+++ b/src/core/loader/ncch.cpp
@@ -315,4 +315,8 @@ ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
     return ResultStatus::Error;
 }
 
+u64 AppLoader_NCCH::GetProgramId() const {
+    return *reinterpret_cast<u64 const*>(&ncch_header.program_id[0]);
+}
+
 } // namespace Loader
diff --git a/src/core/loader/ncch.h b/src/core/loader/ncch.h
index 03116add8..2fe2a7d82 100644
--- a/src/core/loader/ncch.h
+++ b/src/core/loader/ncch.h
@@ -191,6 +191,12 @@ public:
      */
     ResultStatus ReadRomFS(std::vector<u8>& buffer) const override;
 
+    /*
+     * Gets the program id from the NCCH header
+     * @return u64 Program id
+     */
+    u64 GetProgramId() const;
+
 private:
 
     /**