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wstockandClaude Fable 5.1
0e8ebf00e6
The JHOVE PDF-HUL-157 files (tiff2pdf output) end their first trailer with
`/Prev 297298 0 R`: the offset written as a reference. The chain reader took
/Prev as an integer only, so the chain stopped after the first section without
a word, and every object of the earlier sections (here pages 2-4 and their
images) read as null. The document showed one page where Poppler and MuPDF
show four, and a full save wrote the missing kids as null, so pages 2-4 were
unreadable afterwards ("cycle in page tree", 1x1 renders).
A reference-valued /Prev is now read as the offset it names, with a repair-log
note; any other non-offset value is noted and ends the chain as before.
Regression test: document::tests::a_prev_written_as_a_reference_still_reaches_the_earlier_sections.
Verified on JA3-1998-PDF.pdf: four pages read, and after a Subject edit and a
full save Poppler renders all four pages without a warning (before: "Kid
object (page 2) is not an indirect reference (null)").
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011K1peyrh5MdZ6ttHkVq8Gh