BIND 10 #2096: Define and implement "RdataReader" class

[BIND 10 Development]

#2096: Define and implement "RdataReader" class
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                   Reporter:         |                 Owner:  vorner
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120821
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 (Noticed this while checking the latest branch snapshot while
 considering what to pick up next)

 Maybe you're going to change this, but I'm afraid we cannot reasonably
 pass the serialized data size to the `RDataReader` constructor,
 because this information wouldn't be (expected to be) stored on
 encoding (serialization).

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Ticket URL: <https://bind10.isc.org/ticket/2096#comment:11>
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