OpenSystemsDevelopment / qpdf

Also, add diagnostic messages in qpdf_fuzzer and additional fuzz test case.

Fix #1170

In PL_DCT add option to limit the size of uncompressed corrupt data

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, apply limit in dct_fuzzer

Also add new fuzz test case.

Refactor QPDF::parse_xrefEntry

QPDF::processXRefStream

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

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.)

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.

Add fuzz case 68377.

Tune QPDFWriter

Create set without creation of an intermediate vector.

Move reading of the entry from read_xrefTable to parse_xrefEntry.

Split parse_xrefEntry into two new methods read_xrefEntry and
read_bad_xrefEntry. read_xrefEntry is optimised for reading
correct entries. To handle incorrect entries it calls read_bad_xrefEntry,
which is largely unchanged from parse_xrefEntry.