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Merge pull request #1136 from m-holger/todo
Update TODO.md regarding indirect nulls in QPDF_Dictionary
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TODO.md
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@ -337,9 +337,9 @@ so, I find it useful to make reference to them in this list.
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Note that there's nothing that says an indirect object in one update can't refer to an object that
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Note that there's nothing that says an indirect object in one update can't refer to an object that
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doesn't appear until a later update. This means that QPDF has to hang onto indirect nulls,
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doesn't appear until a later update. This means that QPDF has to hang onto indirect nulls,
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including when they appear as dictionary values. In this case, QPDF_Dictionary::getKeys() ignores
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including when they appear as dictionary values. In this case, QPDF_Dictionary::getKeys() ignores
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all keys with null values, and hasKey() returns false for keys that have null values. We would
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all keys with null values, and hasKey() returns false for keys that have null values. QPDF_Dictionary
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probably want to make QPDF_Dictionary able to handle the special case of keys that are indirect
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already handles the special case of keys that are indirect nulls, which is used to reserve foreign
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nulls and basically never have it drop any keys that are indirect objects. We also have to make
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objects, including foreign pages which may or may not be copied. We also have to make
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sure that the testing for this handles non-trivial cases of the targets of indirect nulls being
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sure that the testing for this handles non-trivial cases of the targets of indirect nulls being
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replaced by real objects in an update. Such indirect nulls should appear in tests as dictionary
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replaced by real objects in an update. Such indirect nulls should appear in tests as dictionary
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values and as array values. In the distant past, qpdf used to replace indirect nulls with direct
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values and as array values. In the distant past, qpdf used to replace indirect nulls with direct
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