byte order. If <mark> is not present, we use <int1>. This allows
old versions of RMR to continue to work with new versions that now
do the right thing with byte ordering.
+
+ If the receiver of a message is a backlevel RMR, and it uses RTS to
+ return a message, it will only update the old size, but when the
+ message is received back at a new RMR application it will appear that
+ the message came from a new instance. Therefore, we must compare
+ the old and new sizes and if they are different we must use the old
+ size assuming that this is the case.
*/
static inline uint32_t extract_mlen( unsigned char* buf ) {
uint32_t size; // adjusted (if needed) size for return
+ uint32_t osize; // old size
uint32_t* blen; // length in the buffer to extract
blen = (uint32_t *) buf;
if( *(buf + sizeof( int ) * 2 ) == TP_SZ_MARKER ) {
+ osize = *blen; // old size
size = ntohl( *(blen+1) ); // pick up the second integer
+ if( osize != size ) { // assume back level return to sender
+ size = osize; // MUST use old size
+ }
if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "extract msg len converted from net order to: %d\n", size );
} else {
size = *blen; // old sender didn't encode size