Hi Friends: I am looking for a piece of code which can: input a .zip file name and provide a callback facility which allow me walking in file structure, as well as survive from corrupted zip file. I had read the example code and test code of zlib part in boost::iostreams, it extract data like this: //-- copy from iostreams/filter/test.hpp --// template bool test_filter_pair( OutputFilter out, InputFilter in, const std::string& data, mpl::true_ ) { for ( int inc = default_increment; inc <= default_increment * 40; inc += default_increment ) { array_source src(data.data(), data.data() + data.size()); std::string temp; std::string dest; iostreams::copy(src, compose(out, non_blocking_sink(temp, inc))); iostreams::copy( compose(in, non_blocking_source(temp, inc)), iostreams::back_inserter(dest) ); if (dest != data) return false; } return true; } I think it is not gentle because it try catch all data into memory. So there must be some better way to do? Rgds, David Xiao