}
private IRubyObject initializeCommon(IRubyObject stream) {
realIo = (RubyObject) stream;
try {
io = new com.jcraft.jzlib.GZIPOutputStream(new IOOutputStream(realIo, false, false), 512, false);
return this;
} catch (IOException ioe) {
throw getRuntime().newIOErrorFromException(ioe);
}
}