OpenSystemsDevelopment / qpdf

In QPDF::read_xrefEntry add buffer overflow test for first eol character.
Overlong f1 or f2 entries consisting only of zeros could cause a buffer
overflow.

Add fuzz testcase 69913.

Refine handling of severely damaged files

Also add new fuzz test case.

Amend fuzz future

Refactor QPDF::parse_xrefEntry

QPDF::processXRefStream

Update README-maintainer with wip / modernize qpdf

Fuzz future

A file that has Widget annotations that can't be mapped back to form
fields would crash qpdf json.

Standardize on "qpdf"

Use "QPDF" only for the QPDF class itself.

This works with Visual Studio Build Tools 2022 installed.

Fix QPDF::tableSize

Change the processed Index array to a vector of <first object, number of
entries> pairs.

Add closure damaged to create damagedPDF exceptions.

Tune processing of subsections.

Tune pointer arithmetic.

Apply temporary fix to deal with fuzz case 68915.

(Error is an integer overflow which would immediately cause a runtime error
as a result of a call to QInitCQIntC::to_size.)

Fix bug in QPDFWriter::preserveObjectStreams