Re: [Boost-users] Read/write with gzip

Subject: Re: [Boost-users] Read/write with gzip
From: johann (jgoetz_at_[hidden])
Date: 2011-04-27 12:10:13

I have a feeling this a file descriptor problem. I noticed you didn't close
the FD you opened when writing so I put the write and read blocks in their
own scope (see below). This seems to work now. I'm not sure if you can write
and read from a gzip'd file at the same time, maybe someone else can address
this issue?

compiled with boost 1.45 (gcc)
> g++ test.cpp -otest -lboost_iostreams -lboost_filesystem -lboost_system
> ./test
aaa
aaa

/// BEGIN file:  test.cpp
#include <iostream>

#include &lt;boost/iostreams/filtering_streambuf.hpp&gt;
#include &lt;boost/iostreams/filtering_stream.hpp&gt;
#include &lt;boost/iostreams/copy.hpp&gt;
#include &lt;boost/iostreams/filter/gzip.hpp&gt;
#include &lt;boost/iostreams/device/file_descriptor.hpp&gt;
#include &lt;boost/filesystem.hpp&gt;

using namespace std;
namespace io = boost::iostreams;

int main()
{
    char* memblock_out = (char*) "aaa";
    {
        io::filtering_ostream out;
        out.push(io::gzip_compressor());
        out.push(io::file_descriptor_sink("outfile.tmp.gz"));
        out.write(memblock_out, size);
    }
    cout << memblock_out << endl;

    char* memblock_in = new char [4];
    {
        io::filtering_istream in;
        in.push(io::gzip_decompressor());
        in.push(io::file_descriptor_source("outfile.tmp.gz"));
        in.read(memblock_in, size);
    }
    cout << memblock_in << endl;
}
/// EOF

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