OpenSystemsDevelopment / qpdf

Buffer output locally.
Add qpdf_fuzzer test case.

Also, add additional qpdf_fuzzer test case.

Throw damagedFile if max_warnings is exceeded. Change qpdf_fuzzer warnings limit to
limit to 500.

Try a  limit of 50MB. For very large limits processing time before
damage is encountered may exceed oss-fuzz limits.
Add further test cases.

Reject non-dictionary Page and Pages objects.

Also add additional qpdf_fuzzer test cases.

Add test case for oss-fuzz 15471 and 69977a

Fixes oss-fuzz 70055

As a rule, we should avoid conditional compilation is it always causes
code paths that are sometimes not even seen lexically by the compiler.
Also, we want the actual code being fuzzed to be as close as possible
to the real code. Conditional compilation is suitable to handle
underlying system differences.

Instead, favor configuration using callbacks or other methods that can
be triggered in the places where they need to be exercised.

Add extra fuzz test case and amend memory limit for Pl_DCT.

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.

Also, apply limit in dct_fuzzer

Also add new fuzz test case.

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.

...as well as some cases generated in CI from earlier attempts at
fixing this.