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<p class=MsoNormal>I’m using ragel to decode protocols as a test of its
capabilities.<o:p></o:p></p>
<p class=MsoNormal>One of the protocols is DNS. <o:p></o:p></p>
<p class=MsoNormal>This protocol has a fixed set of fields followed by one or
more optional fields. The count of these optional fields are encoded
within the fixed data field.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Would the code below be the best way to do this ?Initial the
dnsAnswer section called via fcall dnsAnswer. It then sequentially
processes all fields in the order given. In the last field, dnsAnswerResourceDataField
, it gets the count of the number of answer fields included in the protocol,
then perform a series of fgoto’s until the dnsRecordCount is 0 at which
time it returns. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>dnsAnswer := (<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerNameField
.<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerTypeField
.<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerClassField
.<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerTimeToLiveField
.<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerResourceDataLengthField
.<o:p></o:p></p>
<p class=MsoNormal> dnsAnswerResourceDataField
@{ cout << "In dnsAnswer processing" << endl; if
(fsm->getdnsAnswerRecordCount() > 0 ) {<o:p></o:p></p>
<p class=MsoNormal>
fsm->dnsAnswerRecordCount--;<o:p></o:p></p>
<p class=MsoNormal>
fgoto dnsAnswer; } else {<o:p></o:p></p>
<p class=MsoNormal>
fret; }<o:p></o:p></p>
<p class=MsoNormal>
}<o:p></o:p></p>
<p class=MsoNormal> );<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Regards,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Peter J. Gervais <o:p></o:p></p>
<p class=MsoNormal>President, Simtree Information Systems <o:p></o:p></p>
<p class=MsoNormal>17621 Island Rd, <o:p></o:p></p>
<p class=MsoNormal>RR#2 , Martintown, <o:p></o:p></p>
<p class=MsoNormal>Martintown,Ont<o:p></o:p></p>
<p class=MsoNormal>K0C 1S0<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Business: 613-938-6549<o:p></o:p></p>
<p class=MsoNormal>Cell: 613-864-7370<o:p></o:p></p>
<p class=MsoNormal>E-mail: pgervais@xplornet.com<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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