Repairing a Broken PDF in Rust — Rebuilding the XREF Table From Scratch

All tests run on an 8-year-old MacBook Air. Some PDFs won't open. Not because the content is gone — because the index that tells readers where to find the content is corrupt. That index is the XREF table. And it can be rebuilt. Every PDF has a cross-reference table near the end of the file. It's a l