[arno <arnoc@xxxxxxx>]

Hey Guys,

I`m writing a plugin to dissect a protocol the company I`m working for 
uses and i have one problem, that no readme or developer guide could 
solve yet.

The problem is that many parts of the protocol do not always consist of 
the same amount of bytes. Therefore the bytes have to be decoded that 
way (java code):
int decode(bytestream stream){
   int b = stream.readByte();
   int t = b;
   while(b > 127){
      b = stream.readByte();
      t  = (t << 7)) | b;
   }
   return t;
}

Do get the right value is not the problem, but to register the header 
field and to make it filterable. When I try to register it with the 
array hf_register_info I have to specify a data type like FT_UINT8. But 
setting up the header fields with the right amount of bytes of tvb when 
dissecting the packet results in a wrong value, because the bytes have 
to be encoded in the way I`ve mentioned it.
Is there a possibility to register a header field with e.t. FT_UINT32 
and changing the value afterwards? Or is it possible to filter header 
fields that are added with proto_tree_add_text or add_value? Another way 
could be to get the specified bytes of tvb, to encode it the right way 
and then wright it back to tvb, but i did not found a possibility to do 
that.

I would be very glad to hear any suggestions.

thx