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2021-11-02 Jay Berkenbilt <ejb@ql.org>
+ * zlib-flate: warn and exit with code 3 when there is corrupted
+ input data even when decompression is possible. We do this in the
+ zlib-flate CLI so that it can be more reliably used to test the
+ validity of zlib streams, but we don't warn by default in qpdf
+ itself because PDF files in the wild exist with this problem and
+ other readers appear to tolerate it. There is a PDF in the qpdf
+ test suite (form-filled-by-acrobat.pdf) that was written by a
+ version of Adobe Acrobat that exhibits this problem. Fixes #562.
+
+ * Add Pl_Flate::setWarnCallback to make it possible to be notified
+ of data errors that are recoverable but still indicate invalid
+ data.
+
* Improve error reporting when someone forgets the -- after
--pages. Fixes #555.