OpenSystemsDevelopment / qpdf

Fix writing reals with trailing '.' as JSON (fixes #1261)

libtests: include cstdint for GCC 15

GCC 15 starts to no longer include this by default, requiring it to be
explicitly included.

Error message:
libtests/cxx11.cc:75:16: error: ‘uint8_t’ was not declared in this scope
   75 |     check_size<uint8_t>(1, false);
      |                ^~~~~~~
libtests/cxx11.cc:10:1: note: ‘uint8_t’ is defined in header ‘<cstdint>’; this is probably fixable by adding ‘#include <cstdint>’
    9 | #include <regex>
  +++ |+#include <cstdint>
   10 | #include <type_traits>

Signed-off-by: Christopher Fore <csfore@posteo.net>

Adjust fuzzer memory limits and refactor Pl_RunLength::decode

Buffer output locally.
Add qpdf_fuzzer test case.

Also, add additional qpdf_fuzzer test case.

In QPDFWriter::willFilterStream remember unfilterable streams

Refactor xref reconstruction

Avoid unnecessary rescanning of lines and repositioning of input file.
Limit max size of tokens.

Adjust qpdf_fuzzer warnings limit

Mark intentional unsigned integer wrapping in MD5_native::transform and adjust fuzzer memory limits

Wrap-around is intentional and generates false positives

Update TODO.md

Also, remove closed fuzz cases.

In FUTURE make various QPDFObjectHandle methods const

Adjust fuzzer warning and memory limits

Fix QPDFOutlineDocumentHelper::resolveNamedDest  (fixes #1238)

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

Tighten page tree checks

Add further sanity checks to QPDF::reconstruct_xref

Handle case where named destination is a dictionary with /D entry.

Test case is hand-edited outlines-with-old-root-dests.pdf with modified
object 107.

Run getAllPages as sanity check and throw an exception if too many
warnings are generated or no pages are found.

Add further sanity check to QPDF::reconstruct_xref

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

If reconstruct_xref generates more than 1000 warnings give up because the
file is so severely damaged that there is very little point continuing.

Add extra sanity check on pages tree