fs: move bitmap classes out of save::

libraries/libstratosphere/include/stratosphere/fssystem/fssystem_buffered_storage.hpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 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/>.
+ */
+#pragma once
+#include <vapours.hpp>
+#include <stratosphere/os.hpp>
+#include <stratosphere/fs/fs_istorage.hpp>
+#include <stratosphere/fs/fs_substorage.hpp>
+#include <stratosphere/fs/fs_i_buffer_manager.hpp>
+
+namespace ams::fssystem {
+
+    class BufferedStorage : public ::ams::fs::IStorage {
+        NON_COPYABLE(BufferedStorage);
+        NON_MOVEABLE(BufferedStorage);
+        private:
+            class Cache;
+            class UniqueCache;
+            class SharedCache;
+        private:
+            fs::SubStorage m_base_storage;
+            fs::IBufferManager *m_buffer_manager;
+            size_t m_block_size;
+            s64 m_base_storage_size;
+            std::unique_ptr<Cache[]> m_caches;
+            s32 m_cache_count;
+            Cache *m_next_acquire_cache;
+            Cache *m_next_fetch_cache;
+            os::SdkMutex m_mutex;
+            bool m_bulk_read_enabled;
+        public:
+            BufferedStorage();
+            virtual ~BufferedStorage();
+
+            Result Initialize(fs::SubStorage base_storage, fs::IBufferManager *buffer_manager, size_t block_size, s32 buffer_count);
+            void Finalize();
+
+            bool IsInitialized() const { return m_caches != nullptr; }
+
+            virtual Result Read(s64 offset, void *buffer, size_t size) override;
+            virtual Result Write(s64 offset, const void *buffer, size_t size) override;
+
+            virtual Result GetSize(s64 *out) override;
+            virtual Result SetSize(s64 size) override;
+
+            virtual Result Flush() override;
+            virtual Result OperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override;
+            using IStorage::OperateRange;
+
+            void InvalidateCaches();
+
+            fs::IBufferManager *GetBufferManager() const { return m_buffer_manager; }
+
+            void EnableBulkRead() { m_bulk_read_enabled = true; }
+        private:
+            Result PrepareAllocation();
+            Result ControlDirtiness();
+            Result ReadCore(s64 offset, void *buffer, size_t size);
+
+            bool ReadHeadCache(s64 *offset, void *buffer, size_t *size, s64 *buffer_offset);
+            bool ReadTailCache(s64 offset, void *buffer, size_t *size, s64 buffer_offset);
+
+            Result BulkRead(s64 offset, void *buffer, size_t size, bool head_cache_needed, bool tail_cache_needed);
+
+            Result WriteCore(s64 offset, const void *buffer, size_t size);
+    };
+
+}