BIND 10 #1396: suggested extension: Rdata::getLentgh and use it for xfrout

[BIND 10 Development]

#1396: suggested extension: Rdata::getLentgh and use it for xfrout
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            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |  UnAssigned
            Priority:  major         |                       Status:  new
           Component:  libdns++      |                    Milestone:  Next-
           Sensitive:  0             |  Sprint-Proposed
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 It would be useful if the libdns++/isc.dns Rdata class has a
 "get length" method, that returns the length of the RDATA in wire
 format (the possible maximum length, i.e., assuming names (if
 included) are not compressed).

 We can then use it in xfrout to calculate the expected length of
 resonse messages (so they won't exceed 64KB).

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Ticket URL: <http://bind10.isc.org/ticket/1396>
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