Core: Add a passthrough backend for the filesystem, exposed as SDMC.

src/core/file_sys/file_sdmc.h

@@ -0,0 +1,60 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "common/file_util.h"
+
+#include "core/file_sys/file.h"
+#include "core/file_sys/archive_sdmc.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+class File_SDMC final : public File {
+public:
+    File_SDMC();
+    File_SDMC(const Archive_SDMC* archive, const std::string& path, const Mode mode);
+    ~File_SDMC() override;
+
+    /**
+     * Read data from the file
+     * @param offset Offset in bytes to start reading data from
+     * @param length Length in bytes of data to read from file
+     * @param buffer Buffer to read data into
+     * @return Number of bytes read
+     */
+    size_t Read(const u64 offset, const u32 length, u8* buffer) const override;
+
+    /**
+     * Write data to the file
+     * @param offset Offset in bytes to start writing data to
+     * @param length Length in bytes of data to write to file
+     * @param buffer Buffer to write data from
+     * @param flush The flush parameters (0 == do not flush)
+     * @return Number of bytes written
+     */
+    size_t Write(const u64 offset, const u32 length, const u32 flush, const u8* buffer) const override;
+
+    /**
+     * Get the size of the file in bytes
+     * @return Size of the file in bytes
+     */
+    size_t GetSize() const override;
+
+    /**
+     * Close the file
+     * @return true if the file closed correctly
+     */
+    bool Close() const override;
+
+private:
+    FileUtil::IOFile* file;
+};
+
+} // namespace FileSys