message flags from the wire are written to zmq_msg_t and vice versa

src/zmq_decoder.cpp

@@ -112,8 +112,8 @@ bool zmq::zmq_decoder_t::eight_byte_size_ready ()
 
 bool zmq::zmq_decoder_t::flags_ready ()
 {
-    //  No flags are accepted at the moment.
-    zmq_assert (tmpbuf [0] == 0);
+    //  Store the flags from the wire into the message structure.
+    in_progress.flags = tmpbuf [0];
 
     if (prefix.empty ()) {
         next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),

src/zmq_encoder.cpp

@@ -97,13 +97,13 @@ bool zmq::zmq_encoder_t::message_ready ()
     //  message size. In both cases empty 'flags' field follows.
     if (size < 255) {
         tmpbuf [0] = (unsigned char) size;
-        tmpbuf [1] = 0;
+        tmpbuf [1] = (in_progress.flags & ~ZMQ_MSG_SHARED);
         next_step (tmpbuf, 2, &zmq_encoder_t::size_ready, true);
     }
     else {
         tmpbuf [0] = 0xff;
         put_uint64 (tmpbuf + 1, size);
-        tmpbuf [9] = 0;
+        tmpbuf [9] = (in_progress.flags & ~ZMQ_MSG_SHARED);
         next_step (tmpbuf, 10, &zmq_encoder_t::size_ready, true);
     }
     return true;