git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/source/updater/updater_bis_save.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "updater_bis_save.hpp"
+
+namespace ams::updater {
+
+    size_t BisSave::GetVerificationFlagOffset(BootModeType mode) {
+        switch (mode) {
+            case BootModeType::Normal:
+                return 0;
+            case BootModeType::Safe:
+                return 1;
+            default:
+                return 2;
+        }
+    }
+
+    Result BisSave::Initialize(void *work_buffer, size_t work_buffer_size) {
+        AMS_ASSERT(work_buffer_size >= SaveSize);
+        AMS_ASSERT(util::IsAligned(reinterpret_cast<uintptr_t>(work_buffer), os::MemoryPageSize));
+        AMS_ASSERT(util::IsAligned(work_buffer_size, 0x200));
+
+        R_TRY(this->accessor.Initialize());
+        this->save_buffer = work_buffer;
+        return ResultSuccess();
+    }
+
+    void BisSave::Finalize() {
+        this->accessor.Finalize();
+    }
+
+    Result BisSave::Load() {
+        size_t read_size;
+        return this->accessor.Read(&read_size, this->save_buffer, SaveSize, Boot0Partition::BctSave);
+    }
+
+    Result BisSave::Save() {
+        return this->accessor.Write(this->save_buffer, SaveSize, Boot0Partition::BctSave);
+    }
+
+    bool BisSave::GetNeedsVerification(BootModeType mode) {
+        return reinterpret_cast<const u8 *>(this->save_buffer)[GetVerificationFlagOffset(mode)] != 0;
+    }
+
+    void BisSave::SetNeedsVerification(BootModeType mode, bool needs_verification) {
+        reinterpret_cast<u8 *>(this->save_buffer)[GetVerificationFlagOffset(mode)] = needs_verification ? 1 : 0;
+    }
+
+}