FileSys: Added preliminary support for applications reading the RomFS archive.

Archive: Fixed brace ugliness for neobrain :)

FS: Commented out unused local variables to prevent warnings.

...But keeping them here for future use.

archive_romfs: Removed unused #include.

src/core/file_sys/archive.h

@@ -0,0 +1,54 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+
+#include "core/hle/kernel/kernel.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+class Archive : NonCopyable {
+public:
+    /// Supported archive types
+    enum class IdCode : u32 {
+        RomFS               = 0x00000003,
+        SaveData            = 0x00000004,
+        ExtSaveData         = 0x00000006,
+        SharedExtSaveData   = 0x00000007,
+        SystemSaveData      = 0x00000008,
+        SDMC                = 0x00000009,
+        SDMCWriteOnly       = 0x0000000A,
+    };
+
+    Archive() { }
+    virtual ~Archive() { }
+
+    /**
+     * Get the IdCode of the archive (e.g. RomFS, SaveData, etc.)
+     * @return IdCode of the archive
+     */
+    virtual IdCode GetIdCode() const = 0;
+
+    /**
+     * 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
+     */
+    virtual size_t Read(const u64 offset, const u32 length, u8* buffer) const = 0;
+
+    /**
+     * Get the size of the archive in bytes
+     * @return Size of the archive in bytes
+     */
+    virtual size_t GetSize() const = 0;
+};
+
+} // namespace FileSys