[This message was posted by Michael Wong of Chi-X Global Technology <[email protected]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/69a278a0 - PLEASE DO NOT REPLY BY MAIL.]
Rolf, Oh I made a mistake that I think mantissa is optional. so the value is decreased by 1. I want to know how to handle if a field is absent. Michael > > Rolf, > > > > I am sorry I got confused again. For tag 271, the pmap bit is 0. so > > the default value 0 is used for exponent. Can we say that the exponent > > has a value so that we need to decode mantissa? If so, the encoded > > value is 0x82 for the mantissa. The decoded value should be 1 since it > > is delta operator, Right? > > Yes, 0x82 is for the mantissa. No, the decoded mantissa value is 2. Why > do you think the value should be 1? > > > BTW, if the length field of a sequence field is greater than 1, does > > the sequence pmap appear each iteration? > > yes, as noted in my mail below > > (FAST 1.1 spec section 6.2.5 says: "If any instruction of the group > needs to allocate a bit in a presence map, each element is represented > as a segment in the transfer encoding." "element" in this context is > synonymous with my use of "iteration" in my mail below) > > /Rolf > > ... snip ... > > >> Michael, > >> > >> The pmap entry for the length field is located in the _message_ level > >> pmap (bit 7 in this case). The sequence level pmap occurs for every > >> iteration (repetition) of the sequence and provides presence info for > >> the fields in the current iteration. [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/FIX-Protocol?hl=en -~----------~----~----~----~------~----~------~--~---
