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/usr/include/libwfut-0.2/libwfut/crc32.h is in libwfut-0.2-dev 0.2.3-4.

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// This file may be redistributed and modified only under the terms of
// the GNU Lesser General Public License (See COPYING for details).
// Copyright (C) 2005 - 2007 Simon Goodall

#include <zlib.h>
#include <string>

namespace WFUT {

  extern int calcCRC32(const std::string &filename, uLong &crc);

}