OpenSystemsDevelopment / qpdf

…sages, and clean up `QPDF.hh`.

… and `findEndstream` to `Objects`, remove `QPDF::PatternFinder` class, and update related logic for improved encapsulation.

…, replace direct calls with `QIntC` equivalents, and clean up `QPDF.hh`.

…`Lin`, encapsulate optimization data within `Lin`, update usage across the codebase, and streamline related logic in `QPDF_linearization`.

… streamline error handling, and improve encapsulation.

… and streamline stream handling.

…tion, and streamline stream registration logic.

…ta`and streamline foreign stream handling.

…prove encapsulation, and streamline stream data handling.

…eamline foreign object handling, and simplify method structure.

…object reservation, and streamline method usage.

…rect_object`, simplify object replacement, and streamline method usage.

…t usage of `std::shared_ptr`, simplify stream data management, and enforce `final` specifier.

…proved encapsulation.

Encapsulate linearization-related logic in `QPDF::Doc::Linearization`. Refactor methods, relocate implementations, and update all references accordingly to streamline and centralize linearization functionality.

Relocate `Pages` methods to `QPDF::Doc` for improved encapsulation of page-related logic. Adjust all references and methods to use the new placement.

Refactor `pages` method and related members in `QPDF::Doc` to `page_dh`. Update all associated references to reflect the change.

Relocate `Objects` to `QPDF::Doc` for improved encapsulation of object-related logic. Adjust all relevant methods and references to use the new placement.

Relocate `reconstructed_xref` to `QPDF::Doc` for improved encapsulation of cross-reference reconstruction state. Adjust all references to use the updated placement.

Relocate `StreamCopier` to `QPDF::Doc` for improved encapsulation of stream copying functionality. Adjust all references to use the updated placement.

Relocate `JobSetter` to `QPDF::Doc` for improved encapsulation of job-related logic. Adjust all references to use the new placement.

Relocate `Writer` to `QPDF::Doc` for better encapsulation of writer-related logic. Adjust all references to use the new placement.

Relocate `Pipe` functionality to `QPDF::Doc::Streams` for improved encapsulation of stream-related logic. Adjust all references to use the new placement.

Relocate `Resolver` to `QPDF::Doc` for improved encapsulation of resolution logic. Adjust all references accordingly to use the new placement.

Relocate `ParseGuard` to `QPDF::Doc` for better encapsulation of parsing logic. Adjust references in `QPDFParser` accordingly to use the new placement.

Replace direct access to document helpers (`acroform()`, `pages()`, `embedded_files()`, etc.) with calls through `QPDF::doc()` for better encapsulation. Adjust related methods, constructors, and memory management accordingly.

Add `QPDF::Doc` as an inner class to manage document-level functionality. Update memory management in `QPDF::Members` to include `Doc` and ensure proper initialization. Add `QPDF::doc()` method for internal access. Refactor constructors accordingly.

…ance error and warning handling within `BaseHandle` and `QPDF`, highlighting that the error condition is not covered in CI testing without generating codecov noise.

… 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.

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

…mplify control flow, and update method returns.

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