OpenSystemsDevelopment / qpdf

… 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.

…, remove redundant `QTC::TC` call, and simplify type usage.

…y, and simplify implementation.

…actor implementation to simplify null handling and align with API conventions.

…ctionary key access, and simplify null handling logic.

…s and `Members` structure

- Simplified `Members` implementation by inlining into `NNTree` context.
- Replaced `std::shared_ptr<Members>` with `std::make_shared` for improved clarity and usage consistency.
- Updated method calls to directly access `Members`' `impl`.
- Improved maintainability and alignment with modern C++ practices.

…e memory management, and streamline class definition.

…e()` for re-validation and repair of AcroForm structure.

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

…s_dest`, improve memory management, and streamline initialization logic

…rove memory management, and simplify initialization logic.

…fy logic, and enhance consistency with modern C++ practices.

- Introduced a `validate()` method in `QPDFNameTreeObjectHelper`, `QPDFNumberTreeObjectHelper`, and `NNTreeImpl`.
- Ensure proper validation of tree keys and values, detecting invalid entries, unsorted keys, and inconsistencies.
- Added support for auto-repair in case of validation errors.

- Introduced `std::function<bool(QPDFObjectHandle const&)>` to validate tree values.
- Updated constructors and methods across `QPDFNameTreeObjectHelper` and `QPDFNumberTreeObjectHelper` to support value validation.
- Refactored `NNTreeImpl` to check for invalid values during insertion, iteration, and retrieval.
- Improved error handling and reporting for invalid values.

…reamline object assignment, and introduce constructors for `QPDFObjectHandle`.

Implement subscript operators (`operator[]`) to provide indexed access to `QPDFObjectHandle` for both `size_t` and `int` types.

…mplify control flow, and update method returns.

Refactor array handling in `QPDFObjectHandle`: replace `int` with `size_t` for size and index operations, introduce utility functions for type conversions, and simplify sparse array logic.

… warnings, and centralize utility methods.

…or deterministic ID generation (fixes #1235).

…evel` and add `const&` to `child` parameter.

…dding error counting and leveraging `reconstructed_xref` for improved robustness, limiting the acceptable number of errors for damaged files.

…std::string_view`, improving performance and code clarity.

…, improving encapsulation and memory management. Remove the now redundant `pushMD5Pipeline` method and streamline MD5 activation.

…te encryption handling

…ify pipeline stack management

Encapsulated pipeline stack management into a dedicated `Pl_stack` class within `QPDFWriter::Members`. Reorganized related methods to streamline and simplify initialization and activation of pipelines, removing redundant code.

…dundant normalization and string unparse logic across multiple write calls.

… overloads, streamline QDF handling, and simplify string and trailer writes.

…ys with `std::string`, and simplify related password handling logic.

…ased logic in `setEncryptionMinimumVersion`, and reduce redundancy across `QPDFWriter` methods.