OpenSystemsDevelopment / qpdf

…parameter, return success status, and streamline warning handling logic.

…based structure for page mapping, improve indexing logic, and clean up redundant variables.

…mline numeric range parsing, and clean up obsolete test coverage entries.

…minate redundant variables, and simplify underlay/overlay page handling logic.

…ges, replace redundant variables, and improve code readability.

…e number and index handling, update related logic accordingly.

…ors for `Members` and `ProgressReporter`

…DFJob_private.hh`, streamline includes, and reduce header dependencies.

… shared helper retrieval, validation methods, and update usages across the codebase. Remove unused test coverage entries.

…t. Add shared helper retrieval, validation methods, and update usages across the codebase.

…le handling. Add shared helper retrieval, validation methods, and update usages across the codebase.

Integrate `QPDFPageLabelDocumentHelper` with `QPDF` for improved page label handling. Add methods for retrieving shared helper instances, validating page label structures, and streamline usage throughout the codebase.

…n `QPDFWriter` and `QPDFJob`.

…()` method, remove redundant helper functions, and streamline related logic for consistency and maintainability.

…ated `acroform()` method and update related references for improved performance, consistency and maintainability.

…mplify array traversal, and centralize `empty` checks for improved clarity and efficiency.

… pipelines and simplify conditions.

Introduce null checks for `callbacks` in `QPDFObjectHandle` to allow content streams to be parsed without ParserCallbacks. Update `QPDFJob` to pass `nullptr` instead of `DiscardContents` for parsing.

Replaced std::shared_ptr<char> with std::string for passwords in QPDFJob. This simplifies memory management and aligns the implementation with modern C++ standards, improving code readability and maintainability.

Replaced shared pointer usage with a plain std::string for passwords in PageSpec to simplify code and enhance readability. Updated relevant logic and function calls to align with this change, removing unnecessary shared pointer management. Updated TODO to reflect completion of this modernization step.

Replaced `std::shared_ptr<char>` with `std::string` for password fields to simplify memory management and improve clarity. Updated relevant method implementations and function calls accordingly. This change ensures more straightforward and safer password handling throughout the codebase.

Replaced raw shared pointers with std::string for `infilename` to improve simplicity and readability. Added a boolean `empty_input` flag to explicitly track empty input cases. Adjusted related logic and function calls accordingly for consistency.

Replaced shared_ptr<char> with std::string for `outfilename` in QPDFJob, simplifying its usage and reducing unnecessary memory management overhead. Updated related conditional checks and logic to align with the updated type. These changes improve code readability and maintainability.

Simplified checks for empty containers and strings across the codebase using the `.empty()` method. This improves code readability and adheres to best practices for checking emptiness.

Converted multiple occurrences of `count()` to `contains()` throughout the codebase where the goal was to check key existence in containers. This improves code readability and aligns with modern C++ practices, particularly with C++20, making the intent more explicit and potentially aiding performance.

Replace repeated key checks with `want_key` lambda for clarity and maintainability. Transition `Pl_String` from shared to unique ownership to reflect intent and improve resource management. No functional changes introduced.

Consolidate and replace inline JSON schema strings with static constexpr constants for better organization and maintainability. Functionality remains unchanged.

Centralize JSON schema dictionary member addition by introducing `add_if_want_key`. This reduces redundancy and improves maintainability by consolidating repeated logic. No changes to functionality were made.

Replaces repetitive key-check conditions with a reusable lambda function `want_key`, improving code readability and maintainability. Simplifies logic across multiple conditional sections in `QPDFJob.cc`.

Replaced `else if` chains with standalone `if` statements for clarity. Updated conditional checks with modern coding practices, such as using `.contains()` instead of `.count()`. These changes enhance code maintainability and ensure better style consistency.

Simplified code by removing redundant `this` qualifiers where they are not essential, improving readability and alignment with coding standards. No changes were made to functionality.

Thanks to github user @cdosborn for the basic enhancement.

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

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