BIND 10 #3311: Add specialized Rdata implementations for getLength()

[BIND 10 Development]

#3311: Add specialized Rdata implementations for getLength()
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                   Reporter:  muks   |                 Owner:  UnAssigned
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  libdns++                           |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Add specialized `Rdata::getLength()` implementations for various RR types.
 Currently the default implementation renders to a buffer and returns the
 size of the renderered buffer. The type-specific implementations should
 return a calculated size instead. This will speed up xfrout performance.

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Ticket URL: <http://bind10.isc.org/ticket/3311>
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