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

[BIND 10 Development]

#2096: Define and implement "RdataReader" class
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       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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Changes (by vorner):

 * owner:  vorner => UnAssigned
 * status:  accepted => reviewing


Comment:

 Hello

 Replying to [comment:11 jinmei]:
 > 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).

 I noticed it just now, when I decided to put it into review. Will the size
 be a problem?

 Currently, the passed size is used only for future result of getSize()
 (which I don't really know the exact purpose, but anyway). So it can be
 removed quite easily if it is a problem.

 Anyway, to the code. I decided to provide dual interface ‒ allow both
 using it with callbacks and the return value of next. I didn't completely
 delete the parsing test code, but I moved it from the main source code to
 the tests. I reuse the encoding tests for reading too.

-- 
Ticket URL: <http://bind10.isc.org/ticket/2096#comment:12>
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