[UDT] UDT to AIX portability, byte order, endianess problem

[<f....@fz...>]

Hi

I am trying to port UDT to AIX.

Aside from some compiling difficulties (most of them arising due to gcc bugs - I had to use gcc version 3.2.1 - and the pthreads - see the additional flags in my Makefile below), I could not get the app/appserver/appclient application to work across AIX/POWERPC-boarders, meaning I could run the programs on localhost, even on 2 different AIX machines, and connect, but when trying to connect between AIX/POWERPC and LINUX/INTEL machines I got no connection with timeout errorsn no matter on which side the client/server was sitting. 

I suspected this to be an issue of byte ordering, and I found it to be in file src/channel.cpp, for example in line 155:

const CChannel& CChannel::operator<<(CPacket& packet) const
{
   if (m_bEndianess)
   {
      // convert control information into network order
      if (packet.getFlag())
         for (int i = 0, n = packet.getLength() / 4; i < n; ++ i)
            *((uint32_t *)packet.m_pcData + i) = htonl(*((uint32_t *)packet.m_pcData + i));

      // convert packet header into network order
      packet.m_nHeader[0] = htonl(packet.m_nHeader[0]);
      packet.m_nHeader[1] = htonl(packet.m_nHeader[1]);
   }




so on a Big Endian architecture (m_bEndianess = true) this does a htonl(), converting the byte order from host to network order, but on a Little Endian architecture it doesnt.

>From my understanding Network Byte Order IS ALREADY Big Endian, so shouldn't the littleendian machine actually do this conversion (an the bigendian skip it)?

There are a few more htonl()s like the one above.

I got everything to work with the changes in the source I pasted in below.

Any further hints and suggestions for porting UDT to AIX are welcome :-)

Kind regards,

Franz Petri.

PS: Just for curiousity: Did anybody get this to acutally work on OSX/POWERPC?! Or are the "Mac"-Powerpcs not bigendian?