fbuf.reset();
                msg.decode_header(fbuf);
                stub_frag_len = msg.length - 24;

                if (off + stub_frag_len > stub.length) {
                    // shouldn't happen if alloc_hint is correct or greater
                    final byte[] tmp = new byte[off + stub_frag_len];
                    System.arraycopy(stub, 0, tmp, 0, off);
                    stub = tmp;

            fragBuf.reset();
            msg.decode_header(fragBuf);
            final int stub_frag_len = msg.length - 24;
            if (off + stub_frag_len > in.length) {
                // shouldn't happen if alloc_hint is correct or greater
                final byte[] tmp = new byte[off + stub_frag_len];
                System.arraycopy(in, 0, tmp, 0, off);
                in = tmp;
            }