OpenSystemsDevelopment / qpdf

Fix android build issues (fixes #950)

Implement QPDFFormFieldObjectHelper::isChecked

Detect shared /Kids arrays in pages tree

API was defined, but .cc had no implementation. PDF 2.0 manual is surprisingly unclear as to on/off values, giving /Yes in an example and /Off in descriptive text as "not on".

In QPDF::getAllPagesInternal include the /Kids array in the visited set
for loop detection.

Fixes oss-fuzz issue 411312393

Refactor QPDFFormFieldObjectHelper ValueSetter::writeAppearance

Adjusting for under/overflow by repeated incrementing/decrementing can
cause excessive runtime with invalid BBox coordinates.

Fixes oss-fuzz issue 409905355.

Detection of fseeko on Android ABI level < 24 gets a false positive if
_FILE_OFFSET_BITS is not set first.

Thanks to github user @cdosborn for the basic enhancement.

Fix logic around cleartext metadata (fixes #1368)

Only top-level XMP metadata is supposed to be left unencrypted. All
other metadata is not treated specially.

Allow rotate as array in job JSON (fixes #1401)

Replace JetBrains-specific cmake profiles with CMakePresets.json

Deprecate QPDF::optimize

Plus sneak in some spell checks

Fix offsets in QPDF::resolveObjectsInStream warnings

CMake: correctly detect that timezone is not an int

As discussed in #1396.

Internally use -1 to represent a missing offset and provide a constructor
overload that allows 0 as a valid offset.

In QPDF::damagedPDF use the new overload.

Enhance --rotate usage message (fixes #1410)

Also, silently fix any angle that is a multiple of 90.

Refactor QPDFWriter::writeObjectStreamOffsets

Rather than converting each (sequential) object id to a string,
generate a string for the first id and than increment the digits in the
string.

The simple CMake test that printf("%ld", timezone) to tell if HAVE_EXTERN_LONG_TIMEZONE, incorrectly saw an int after casting FreeBSD's char * timezone(int zone, int dst) pointer function to an int. By dividing it by 60 (as will occur in the .cc file), we ensure the test program to fail and thus HAVE_EXTERN_LONG_TIMEZONE not to be defined.

Add new CLI Option --remove-structure

... to remove the /Root /StructTreeRoot and /MarkInfo entries.

Tune QPDFWriter writes to Pl_Count

... and use it in QPDFWriter and QPDF::generateHintStream.

Also, remove redundant QPDFWriter::writeBuffer.