Hello everybody, I meeting a execution issue while using the gzip filter of the Boost.Iostreams, combined with a buffered home-made one. I would like to know what is wrong in my way to do it. Firstly, my filter is a general DualFilter. It uses an buffer (of 16 bytes) before the transformation and the put/return. The categories of my filter is closable and dual_use. You can find code details in the end of this mail. My problem is ([a/b] means for the separates case with the letter a and b): If I take the 6 possibilities for write and read: 1) io::filtering_[i/o]stream stm; 2) stm.push(io::gzip_[de/]compressor()); 3) stm.push(my_[Unt/T]ransFilter); at the moment to use the stm.[get/put] to read/write 1)-2) works perfectly 1)-3) works perfectly 1)-3)-2) works perfectly 1)-2)-3) Stay stuck (obviously it is the one I really need) In fact in the last case, the gzip filter give this infinite loop to the put of the TransFilter : 31 -117 8 0 0 0 0 0 0 31 -117 8 0 0... A similar case occur with the bzip filter (even if it is a bit longer loop). What do I do wrong ? Somebody can help me ? Thanks in advance Christophe PS: here a simplified implementation of my filter template<typename Source> int get(Source& src) { //at the very beginning or if the buffer are fully returned if (fcurrent_pos == fblkLength) { fcurrent_pos =0; FillThem (src); //fill&transform the buffers with the right number of src.get() fc=CheckNSolveBufferIsEnd (src); //eventually prepare read the suffix of the file } //The effective return if (fcurrent_pos < fUntrans.size ()) return (int)fUntrans[fcurrent_pos++]; else return fc; } template<typename Sink> bool put(Sink& dest, int c) { if (c==EOF || c ==boost::iostreams::WOULD_BLOCK) return false; if (fUntrans.size () < fblkLength - 1) { fUntrans.AddData((char*)(&c),1); return true; } fUntrans.AddData((char*)(&c),1); fenc->TransformThis (fUntrans, fTrans, fKey); for (int i=0; i<fblkLength; i++) { if (!boost::iostreams::put(dest, (int)fTrans[i])) return false; } return true; } template<typename Sink> bool close (Sink &dest, BOOST_IOS::openmode m) { if (fFlushed) return true; PrepareSuffix (); for (int i=0; i< fblkLength*2; //suffix length i++) { if (!boost::iostreams::put(dest, (int)fTrans[i])) return false; } return true; }