BIND 10 #2369: InputSource helper class for MasterLexer

[BIND 10 Development]

#2369: InputSource helper class for MasterLexer
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121106
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  libdns++                           |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by muks):

 * owner:  muks => UnAssigned
 * status:  assigned => reviewing


Comment:

 Up for review. Reviewers please note:

 * The constructor changes above have been added.
 * The buffer inside `InputSource` just grows and grows; I may be mis-
 reading this ticket, so please correct me in this review if it has to be
 different
 * Also note the case about what happens when `saveLine()` is called in the
 middle of a file, and then at the end of the file, we call `ungetAll()`.
 The line number gets correctly unset, but what about the buffer position
 (consider the last point about the size of the buffer).

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Ticket URL: <http://bind10.isc.org/ticket/2369#comment:4>
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