OpenSystemsDevelopment / qpdf

Fix QPDF::tableSize

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

Code failed to allow for QPDF::getCompressibleObjSet deleting objects
from the object cache in case of multiple entries for the same object id.

Add fuzz test case 68668.

Fix bugs in #1161

Add fuzz case 68377.

...based on a debian bug report.

Add bad xref table test

Tune QPDFWriter

Update README-maintainer.md for clang-format-18

Fix manual entry for --pages

Fix pikepdf future CI

Ensure pikepdf is build with QPDF_FURURE enabled.

Create set without creation of an intermediate vector.

This triggers compilation failures with certain C++20 compiler configurations.

To avoid this I moved the cast to the loop's body.

For now, we are using codecov as an internal tool and not advertising
code coverage. I scrutinize coverage on include and libqpdf but don't
want to remove coverage reporting for other areas.

Add test for QPDFObjectHandle::isDirectNull