[Boost-users] boost::iostreams zlib compression

From: j.c. (jolix_at_[hidden])
Date: 2008-03-03 17:13:32

Ok I think this sucks. :-) Here is my code to implement zlib  
compression/decompression via boost. However since is uses streams I  
cannot simply pass a buffer. This code is intended for compress socket  
buffers, but is pathetically slow. HAs anyone done this? What can I  
improve? The copy seems to be the bottle neck.

thx jc

Here is my code:

#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <boost/iostreams/device/file.hpp>
#include <boost/iostreams/stream.hpp>
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/detail/config/zlib.hpp>

using namespace boost::iostreams;

std::string compress(std::string data)
{
     std::stringstream compressed;
     std::stringstream decompressed;
     decompressed << data;
     boost::iostreams::filtering_streambuf<boost::iostreams::input> out;
     out.push(boost::iostreams::zlib_compressor());
     out.push(decompressed);
     boost::iostreams::copy(out, compressed);
     return compressed.str();
}

std::string decompress(std::string data)
{
     std::stringstream compressed;
     std::stringstream decompressed;
     compressed << data;
     boost::iostreams::filtering_streambuf<boost::iostreams::input> out;
     out.push(boost::iostreams::zlib_decompressor());
     out.push(compressed);
     boost::iostreams::copy(out, decompressed);
     return decompressed.str();
}

int main()
{
     std::string data = compress("boo!");
     std::cout << data << std::endl;
     std::cout << decompress(data) << std::endl;

     return 0;
}