In case there is a problem with sending zipped files i just list my code here(with no tests or docs,just hpp): #ifndef BOOST_CHECKSUM_HPP #define BOOST_CHECKSUM_HPP #include <boost/cstdint.hpp> #include <vector> namespace boost { typedef boost::uint8_t byte; class checksum { public: checksum(); checksum(const checksum&); checksum(const std::vector<byte>&); void process(); void put_data(const std::vector<byte>&); byte get_sum() const; bool proceeded() const; private: byte sum; std::vector<byte> in_data; bool done; };//boost::checksum inline checksum::checksum() : sum(0), done(false) { } inline checksum::checksum(const boost::checksum &cs) { sum=cs.sum; done=cs.done; in_data=cs.in_data; } inline checksum::checksum(const std::vector<byte> &_in_data) : sum(0), done(false), in_data(_in_data) { } inline void checksum::process() { if (!done) { uint8_t temp_sum=0; for (std::vector<byte>::const_iterator it=in_data.begin();it<in_data.end();it++) temp_sum+=*it; sum=temp_sum; done=true; } } inline void checksum::put_data(const std::vector<byte> &_in_data) { if (in_data!=_in_data) { in_data=_in_data; done=false; } } inline byte checksum::get_sum() const { return sum; } inline bool checksum::proceeded() const { return done; } } //namespace boost #endif // BOOST_CHECKSUM_HPP -- Alexandr mailto:daywalker@mail333.com