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diff --git a/src/lib/arch/IArchFile.h b/src/lib/arch/IArchFile.h
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+++ b/src/lib/arch/IArchFile.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common/IInterface.h"
+#include "common/stdstring.h"
+#include "base/String.h"
+
+//! Interface for architecture dependent file system operations
+/*!
+This interface defines the file system operations required by
+barrier.  Each architecture must implement this interface.
+*/
+class IArchFile : public IInterface {
+public:
+    //! @name manipulators
+    //@{
+
+    //! Extract base name
+    /*!
+    Find the base name in the given \c pathname.
+    */
+    virtual const char*    getBasename(const char* pathname) = 0;
+
+    //! Get user's home directory
+    /*!
+    Returns the user's home directory.  Returns the empty string if
+    this cannot be determined.
+    */
+    virtual std::string    getUserDirectory() = 0;
+
+    //! Get system directory
+    /*!
+    Returns the ussystem configuration file directory.
+    */
+    virtual std::string    getSystemDirectory() = 0;
+
+    //! Get installed directory
+    /*!
+    Returns the directory in which Barrier is installed.
+    */
+    virtual std::string    getInstalledDirectory() = 0;
+
+    //! Get log directory
+    /*!
+    Returns the log file directory.
+    */
+    virtual std::string    getLogDirectory() = 0;
+
+    //! Get plugins directory
+    /*!
+    Returns the plugin files directory. If no plugin directory is set,
+    this will return the plugin folder within the user's profile.
+    */
+    virtual std::string    getPluginDirectory() = 0;
+
+    //! Get user's profile directory
+    /*!
+    Returns the user's profile directory. If no profile directory is set,
+    this will return the user's profile according to the operating system,
+    which will depend on which user launched the program.
+    */
+    virtual std::string    getProfileDirectory() = 0;
+
+    //! Concatenate path components
+    /*!
+    Concatenate pathname components with a directory separator
+    between them.  This should not check if the resulting path
+    is longer than allowed by the system;  we'll rely on the
+    system calls to tell us that.
+    */
+    virtual std::string    concatPath(
+                            const std::string& prefix,
+                            const std::string& suffix) = 0;
+    
+    //@}
+    //! Set the user's profile directory
+    /*
+    Returns the user's profile directory.
+    */
+    virtual void        setProfileDirectory(const String& s) = 0;
+
+    //@}
+    //! Set the user's plugin directory
+    /*
+    Returns the user's plugin directory.
+    */
+    virtual void        setPluginDirectory(const String& s) = 0;
+};