[This message was posted by Dale Wilson of Object Computing, Inc
<[email protected]> to the "FAST Protocol" discussion forum at
http://fixprotocol.org/discuss/46. You can reply to it on-line at
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Hi Naresh,
> Part of template
[decimal name="MDEntrySize" id="271" presence="optional"]
[exponent][copy value="0"/][/exponent]
[mantissa][delta/][/mantissa]
[/decimal]
> For the exponent I get the following hex value 0x83 which is 3 less (1)
> for being optional & greater than zero gives me a exponent value of 2
>
OK So far.
> I have for the mantissa 0x80 which is mandatory and signed integer null.
>
No. In this case the mantissa field is not nullable. That means what you have
is a delta value of zero. The previous value of the mantissa is unchanged.
> Therefore when I get the final decimal I get [0 x 10.pow(2)] = 0;
>
> This seems correct except when I compare to the openfast library I get
> 100 (as below line 7 271=100)
>
> The lines below show 4 entries under a sequence.
>
> The line beginning with '+' is my own app. The line with * is from
> openfast both processing the exact same binary message.
>
> You can see line 8 field value 271=0 and does match the openfast
> results.
>
{SNIP}
> * 279=0,269=0,48=CH0047533572,270=1595.44,271=100,273=12:31:06.61-
> 6,336=EBRk,346=0,6566=1,1023=3,83=33359
> + 279=0,269=0,48=CH0047533572,270=1595.44,271=100,273=12:31:06.61-
> 6,336=EBRk,346=0,6566=1,1023=3,83=33359
NOTE THAT 100 will be stored in the dictionary for field 271.
{SNIP: 271 does not appear in the snipped lines}
> * 279=0,269=1,48=CH0047533572,270=1610.44,271=100,273=12:31:06.61-
> 6,336=EBRk,346=0,6566=1,1023=2,83=33361
> + 279=0,269=1,48=CH0047533572,270=1610.44,271=0,
> 273=12:31:06.616,336=EBRk,346=1,6566=1,1023=2,83=33361
Here the delta of zero should be applied to the saved 100 from the dictionary
to produce a value of 100 for field 271.
Dale
--
Dale Wilson
Principal Software Engineer
Object Computing, Inc. (www.ociweb.com)
Lead developer for QuickFAST (http:www.quickfast.org)
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