--- a
+++ b/src/internfile/uncomp.h
@@ -0,0 +1,68 @@
+/* Copyright (C) 2013 J.F.Dockes
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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, write to the
+ *   Free Software Foundation, Inc.,
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _UNCOMP_H_INCLUDED_
+#define _UNCOMP_H_INCLUDED_
+
+#include <vector>
+#include <string>
+
+#include "pathut.h"
+#include "ptmutex.h"
+
+/// Uncompression script interface.
+class Uncomp {
+public:
+    Uncomp(bool docache = false)
+	: m_dir(0), m_docache(docache)
+    {
+    }
+    ~Uncomp();
+
+    /** Uncompress the input file into a temporary one, by executing the
+     * script given as input. 
+     * Return the path to the uncompressed file (which is inside a 
+     * temporary directory).
+     */
+    bool uncompressfile(const std::string& ifn, 
+			const std::vector<std::string>& cmdv,
+			std::string& tfile);
+
+private:
+    TempDir *m_dir;
+    string   m_tfile;
+    string   m_srcpath;
+    bool m_docache;
+
+    class UncompCache {
+    public:
+	UncompCache()
+	    : m_dir(0)
+	{
+	}
+	~UncompCache()
+	{
+	    delete m_dir;
+	}
+	PTMutexInit m_lock;
+	TempDir *m_dir;
+	string   m_tfile;
+	string   m_srcpath;
+    };
+    static UncompCache o_cache;
+};
+
+#endif /* _UNCOMP_H_INCLUDED_ */