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diff --git a/indra/llfilesystem/llfilesystem.h b/indra/llfilesystem/llfilesystem.h
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+++ b/indra/llfilesystem/llfilesystem.h
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+/**
+ * @file filesystem.h
+ * @brief Simulate local file system operations.
+ * @Note The initial implementation does actually use standard C++
+ *       file operations but eventually, there will be another
+ *       layer that caches and manages file meta data too.
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_FILESYSTEM_H
+#define LL_FILESYSTEM_H
+
+#include "lluuid.h"
+#include "llassettype.h"
+#include "lldiskcache.h"
+
+class LLFileSystem
+{
+    public:
+        LLFileSystem(const LLUUID& file_id, const LLAssetType::EType file_type, S32 mode = LLFileSystem::READ);
+        ~LLFileSystem();
+
+        BOOL read(U8* buffer, S32 bytes);
+        S32  getLastBytesRead();
+        BOOL eof();
+
+        BOOL write(const U8* buffer, S32 bytes);
+        BOOL seek(S32 offset, S32 origin = -1);
+        S32  tell() const;
+
+        S32 getSize();
+        S32 getMaxSize();
+        BOOL rename(const LLUUID& new_id, const LLAssetType::EType new_type);
+        BOOL remove();
+
+        static bool getExists(const LLUUID& file_id, const LLAssetType::EType file_type);
+        static bool removeFile(const LLUUID& file_id, const LLAssetType::EType file_type, int suppress_error = 0);
+        static bool renameFile(const LLUUID& old_file_id, const LLAssetType::EType old_file_type,
+                               const LLUUID& new_file_id, const LLAssetType::EType new_file_type);
+        static S32 getFileSize(const LLUUID& file_id, const LLAssetType::EType file_type);
+
+    public:
+        static const S32 READ;
+        static const S32 WRITE;
+        static const S32 READ_WRITE;
+        static const S32 APPEND;
+
+    protected:
+        LLAssetType::EType mFileType;
+        LLUUID  mFileID;
+        S32     mPosition;
+        S32     mMode;
+        S32     mBytesRead;
+//private:
+//    static const std::string idToFilepath(const std::string id, LLAssetType::EType at);
+};
+
+#endif  // LL_FILESYSTEM_H