/usr/include/pstoedit/drvfuncs.h is in libpstoedit-dev 3.62-2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | /* 
   drvfuncs.h : This file is part of pstoedit
   This file contains the declarations of the functions, // each driver has to implement
   Copyright (C) 1993 - 2013 Wolfgang Glunz, wglunz35_AT_pstoedit.net
    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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
private: // yes these are private, library users should use the public interface
	 // provided via drvbase
	void open_page();
	void close_page();
	void show_path(); 
//	void show_text(const TextInfo & textInfo);
//	void show_rectangle(const float llx, const float lly, const float urx, const float ury);
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