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Operations that add the same object to multiple places in the pages tree are throwing exceptions and then later causing assertion failures. The assert calls shouldn't be there.
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Converted ResourceFinder to ParserCallbacks so we can better detect the name that precedes various operators and use the operators to sort the names into resource types. This enables us to be smarter about detecting unreferenced resources in pages and also sets the stage for reconciling differences in /DR across documents.
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I thought /EFF was supposed to be used as a default for decrypting embedded file streams, but actually it's supposed to be advice to a conforming writer about handling new ones. This makes sense since the findAttachmentStreams code, which is not actually needed, was never right.
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Add constructors that take a QPDF object so we can issue warnings and create new indirect objects.
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Avoid calling finish() multiple times on the pipeline passed to pipeContentStreams. This commit also fixes a bug in which qpdf was not exiting with the proper exit status if warnings found while splitting pages; this was exposed by a test case that changed.
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Make some more methods in QPDFPageObjectHelper work with form XObjects, provide forEach methods to walk through nested form XObjects, possibly recursively. This should make it easier to work with form XObjects from user code.
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Refactor QPDF_Stream to use stream filter classes to handle supported stream filters as well.