Archives: Reduced duplicate code in RomFS and SaveCheck.

Fixed a few warnings and cleaned up the code

src/core/file_sys/ivfc_archive.h

@@ -0,0 +1,63 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "common/common_types.h"
+
+#include "core/file_sys/archive_backend.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+class IVFCArchive : public ArchiveBackend {
+public:
+    IVFCArchive();
+
+    std::unique_ptr<FileBackend> OpenFile(const Path& path, const Mode mode) const override;
+    bool DeleteFile(const Path& path) const override;
+    bool RenameFile(const Path& src_path, const Path& dest_path) const override;
+    bool DeleteDirectory(const Path& path) const override;
+    ResultCode CreateFile(const Path& path, u32 size) const override;
+    bool CreateDirectory(const Path& path) const override;
+    bool RenameDirectory(const Path& src_path, const Path& dest_path) const override;
+    std::unique_ptr<DirectoryBackend> OpenDirectory(const Path& path) const override;
+    ResultCode Format(const Path& path) const override;
+
+protected:
+    friend class IVFCFile;
+    std::vector<u8> raw_data;
+};
+
+class IVFCFile : public FileBackend {
+public:
+    IVFCFile(const IVFCArchive* archive) : archive(archive) {}
+
+    bool Open() override { return true; }
+    size_t Read(const u64 offset, const u32 length, u8* buffer) const override;
+    size_t Write(const u64 offset, const u32 length, const u32 flush, const u8* buffer) const override;
+    size_t GetSize() const override;
+    bool SetSize(const u64 size) const override;
+    bool Close() const override { return false; }
+    void Flush() const override { }
+
+private:
+    const IVFCArchive* archive;
+};
+
+class IVFCDirectory : public DirectoryBackend {
+public:
+    IVFCDirectory() { }
+
+    bool Open() override { return false; }
+    u32 Read(const u32 count, Entry* entries) override { return 0; }
+    bool Close() const override { return false; }
+};
+
+} // namespace FileSys