savedata_factory: Partially implement IVFC save sizes using files

This stores a file in the save directory called '.yuzu_save_size' which stores the two save sizes (normal area and journaled area) sequentially as u64s.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/core/file_sys/savedata_factory.cpp b/src/core/file_sys/savedata_factory.cpp
index d63b7f19b..54f5b698a 100644
--- a/src/core/file_sys/savedata_factory.cpp
+++ b/src/core/file_sys/savedata_factory.cpp
@@ -13,6 +13,8 @@
 
 namespace FileSys {
 
+constexpr const char* SAVE_DATA_SIZE_FILENAME = ".yuzu_save_size";
+
 std::string SaveDataDescriptor::DebugInfo() const {
     return fmt::format("[type={:02X}, title_id={:016X}, user_id={:016X}{:016X}, save_id={:016X}]",
                        static_cast<u8>(type), title_id, user_id[1], user_id[0], save_id);
@@ -132,4 +134,32 @@ std::string SaveDataFactory::GetFullPath(SaveDataSpaceId space, SaveDataType typ
     }
 }
 
+SaveDataSize SaveDataFactory::ReadSaveDataSize(SaveDataType type, u64 title_id,
+                                               u128 user_id) const {
+    const auto path = GetFullPath(SaveDataSpaceId::NandUser, type, title_id, user_id, 0);
+    const auto dir = GetOrCreateDirectoryRelative(this->dir, path);
+
+    const auto size_file = dir->GetFile(SAVE_DATA_SIZE_FILENAME);
+    if (size_file == nullptr || size_file->GetSize() < sizeof(SaveDataSize))
+        return {0, 0};
+
+    SaveDataSize out;
+    if (size_file->ReadObject(&out) != sizeof(SaveDataSize))
+        return {0, 0};
+    return out;
+}
+
+void SaveDataFactory::WriteSaveDataSize(SaveDataType type, u64 title_id, u128 user_id,
+                                        SaveDataSize new_value) {
+    const auto path = GetFullPath(SaveDataSpaceId::NandUser, type, title_id, user_id, 0);
+    const auto dir = GetOrCreateDirectoryRelative(this->dir, path);
+
+    const auto size_file = dir->CreateFile(SAVE_DATA_SIZE_FILENAME);
+    if (size_file == nullptr)
+        return;
+
+    size_file->Resize(sizeof(SaveDataSize));
+    size_file->WriteObject(new_value);
+}
+
 } // namespace FileSys