hello,
i have a problem. i'm using boost::iostreams to compress and decompress
files using lib bzip2. compressing filestreams works fine, also
decompressing a filestream into a stringstream.
but compressing stuff into a stringstream fails. any idea? is my code wrong?
below the code:
#define BOOST_ALL_NO_LIB
#include <fstream>
#include <iostream>
#include <string>
#include <sstream>
#include
#include
#include
using namespace std;
using namespace boost;
using namespace boost::iostreams;
int main()
{
// filestream --> compressed stringstream
// FAILS !!
{
stringstream ss;
filtering_streambuf<output> out;
out.push(bzip2_compressor());
out.push(ss);
ifstream file_in("sometext.txt", ios::in | ios::binary);
if(file_in.is_open())
cout << "\n bytes compressed to sstream:" << copy(file_in, out);
cout << "\n length of compressed stringstream:" <<
ss.str().length(); // <-- ss is empty!
}
// filestream --> compressed filestream
// WORKS!
{
ofstream file_out("compressedstuff.bz2", ios::out | ios::binary);
if(file_out.is_open())
{
filtering_streambuf<output> out;
out.push(bzip2_compressor());
out.push(file_out);
ifstream file_in("sometext.txt", ios::in | ios::binary);
if(file_in.is_open())
copy(file_in, out);
}
}
// compressed filestream --> filestream
// WORKS!
{
ifstream file("compressedstuff.bz2", ios::in | ios::binary);
if(file.is_open())
{
filtering_streambuf<input> in;
in.push(bzip2_decompressor());
in.push(file);
ofstream file_out("somedecompressed.txt", ios::out |
ios::binary);
if(file_out.is_open())
copy(in, file_out);
}
}
// compressed filestream --> stringstream
// WORKS!
{
ifstream file("compressedstuff.bz2", ios::in | ios::binary);
if(file.is_open())
{
filtering_streambuf<input> in;
in.push(bzip2_decompressor());
in.push(file);
stringstream ss;
copy(in, ss);
cout << "\n length of stringstream:" << ss.str().length();
}
}
}
Andre Krause