OpenSystemsDevelopment / qpdf

…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.

…`, simplify method signatures, and centralize logic in `QPDF::EncryptionData` for improved maintainability.

…ng in method parameters, and simplify encryption logic for improved maintainability and reduced redundancy.

…uce redundancy, improve maintainability, and streamline parameter handling.

…ling, and improve maintainability.

…Perms_value_V5` methods; inline their logic into `setV5EncryptionParameters` to simplify encryption data processing.

…dom_string`, improve readability of salts and keys handling, and streamline `compute_Perms_value_V5_clear` logic by returning strings directly.