Using DeflateStream in C++?

Question

I'm currently trying to port some C# codes involving usage of DeflateStream into standard C++ without the support of .NET framework. One example of such function is:

public static byte[] ReadCompressed(this Stream stream)
{
    var reader = new BinaryReader(stream);
    int len = reader.ReadInt32();
    var array = new byte[len];
    var ds = new DeflateStream(stream, CompressionMode.Decompress);
    ds.Read(array, 0, len);
    ds.Close();
    return array;
}

Just wondering, Is there an easy way to port the above code into C++? Thanks!

Answer 1

You might want to use zlib. The easiest way to do that in C++ is to use the Boost wrapper for it.

I'm not entirely sure what your example does, but here's how to read in a zlib-compressed file and write its contents to stdout (adapted from an example in the docs):

namespace io = boost::iostreams;

std::ifstream file("hello.z", std::ios_base::binary);
io::filtering_streambuf<io::input> in;
in.push(io::zlib_decompressor());
in.push(file);
io::copy(in, std::cout);