sys_fs_open: support split files

rpcs3/Emu/Cell/lv2/sys_fs.cpp

@@ -282,6 +282,29 @@ error_code sys_fs_open(vm::cptr<char> path, s32 flags, vm::ptr<u32> fd, s32 mode
 
 	fs::file file(local_path, open_mode);
 
+	if (!file && open_mode == fs::read && fs::g_tls_error == fs::error::noent)
+	{
+		// Try to gather split file (TODO)
+		std::vector<fs::file> fragments;
+
+		for (u32 i = 66600; i <= 66699; i++)
+		{
+			if (fs::file fragment{fmt::format("%s.%u", local_path, i)})
+			{
+				fragments.emplace_back(std::move(fragment));
+			}
+			else
+			{
+				break;
+			}
+		}
+
+		if (!fragments.empty())
+		{
+			file = fs::make_gather(std::move(fragments));
+		}
+	}
+
 	if (!file)
 	{
 		if (test(open_mode & fs::excl) && fs::g_tls_error == fs::error::exist)