Re: [Quickfix-developers] Field Ordering?

[Oren M. <or...@qu...>]

This is accounted for in the extractField method in Message.cpp:

    /* Assume length field is 1 less. */
    int lenField = field - 1;
    /* Special case for Signature which violates above assumption. */
    if ( field == 89 ) lenField = 93;

This is the only exception to the length/data field rule that I know of.

--oren

Andrei Goldchleger wrote:

>QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
>QuickFIX Support: http://www.quickfixengine.org/services.html
>
>Hi there,
>
>I was looking at the MessageSorters [.h/.cpp] files to understand
>better how QuickFix handles field ordering. I was not really clear how
>it handles the rule that 'raw data' must be preceded by a  field
>containing the data length. Then I realized that QF orders the fields
>by ascending tag order, and *most* data fields (checked in FIX.4.4)
>have their tag numbers immediately following  the associated length
>tag. For example:
>
>    field number="90" name="SecureDataLen" type="LENGTH"
>    field number="91" name="SecureData" type="DATA"
>
>However:
>
>   field number="89" name="Signature" type="DATA"
>   field number="93" name="SignatureLength" type="LENGTH"
>
>So, the question is: does QF implement any special handling for data
>fields? If so, in which classes are they handled? Maybe I am  missing
>something, but it feels as the used approach will fail to produce a
>valid massage if the message contains a  signature.
>
>Thanks for you help,
>
>Andrei
>
>
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