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

src/core/file_sys/archive_sdmc.h

@@ -0,0 +1,79 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+#include "core/file_sys/archive.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+/// File system interface to the SDMC archive
+class Archive_SDMC final : public Archive {
+public:
+    Archive_SDMC(const std::string& mount_point);
+    ~Archive_SDMC() override;
+
+    bool Initialize();
+
+    /**
+     * Get the IdCode of the archive (e.g. RomFS, SaveData, etc.)
+     * @return IdCode of the archive
+     */
+    IdCode GetIdCode() const override { return IdCode::SDMC; };
+
+    /**
+     * Open a file specified by its path, using the specified mode
+     * @param path Path relative to the archive
+     * @param mode Mode to open the file with
+     * @return Opened file, or nullptr
+     */
+    std::unique_ptr<File> OpenFile(const std::string& path, const Mode mode) const override;
+
+    /**
+     * Read data from the archive
+     * @param offset Offset in bytes to start reading archive from
+     * @param length Length in bytes to read data from archive
+     * @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 archive
+     * @param offset Offset in bytes to start writing data to
+     * @param length Length in bytes of data to write to archive
+     * @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, u8* buffer) override;
+
+    /**
+     * Get the size of the archive in bytes
+     * @return Size of the archive in bytes
+     */
+    size_t GetSize() const override;
+
+    /**
+     * Set the size of the archive in bytes
+     */
+    void SetSize(const u64 size) override;
+
+    /**
+     * Getter for the path used for this Archive
+     * @return Mount point of that passthrough archive
+     */
+    std::string GetMountPoint() const;
+
+private:
+    std::string mount_point;
+};
+
+} // namespace FileSys