OpenSystemsDevelopment / qpdf

Instead of calling assert for problems found during checking
linearization data, throw an exception which is later caught and
issued as an error. Ideally we would handle errors more robustly, but
this is still a significant improvement.

Pushing member variables into a nested class enables addition of new
member variables without breaking binary compatibility.

Pushing inherited objects to pages and getting all pages were both
prone to stack overflow infinite loops if there were loops in the
Pages dictionary. There is a general weakness in the code in that any
part of the code that traverses the Pages structure would be prone to
this and would have to implement its own loop detection. A more robust
fix may provide some general method for handling the Pages structure,
but it's probably not worth doing.

Note: addition of *Internal2 private functions was done rather than
changing signatures of existing methods to avoid breaking
compatibility.

For std::string and std::vector, replace operator[] with at.  This was
done using an automated process.  See README.hardening for details.

Even though this case is not valid according to the spec, it has been
seen, and caused an internal error.

In internal code and examples, replace calls to getObjectID() and
getGeneration() with calls to getObjGen() where possible.

This includes QPDF::copyForeignObject and supporting foreign objects
as arguments to addPage*.

Previous versions of qpdf incorrectly passed arbitrary objects from
/Pages objects down to individual pages in direct contradition with
the PDF specification.  These are now left in /Pages.  When
intermediate /Pages nodes are being discarded as when the /Pages tree
is being flattened, a warning is issued when unknown keys are
encountered.

Refactored optimizePagesTree to pushInheritedAttributesToPage and made
public

Split optimizePagesTree into a simpler top-level routine and a
recursive internal routine.

…uffer; also fix a bug in BufferInputSource::seek

git-svn-id: svn+q:///qpdf/trunk@1030 71b93d88-0707-0410-a8cf-f5a4172ac649

know an object is already direct


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