OpenSystemsDevelopment / qpdf

…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.

Replace `getParsedOffset()` with the new `offset()` method across `QPDFObjectHandle` and related classes for consistent offset handling. Simplify logic and remove redundant `getParsedOffset()` implementation.

…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.

Introduce new methods: `data()` to access buffer content, `empty()` to check buffer state, and `size()` to retrieve buffer size. Update unit tests to validate the behavior of these methods alongside existing functionality.

Implement `Buffer::view()` to provide a read-only view of the buffer content. Update unit tests to validate `view()` behavior alongside `move()`. Include necessary `#include <string_view>` for functionality.

Refactor `Buffer`: implement `move()` method to enable efficient transfer of content to a string, leaving the buffer empty. Include unit tests for `move()` functionality to ensure correctness. Remove redundant `#include <cstring>` for cleanup.

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

…input_entry`, centralize input file handling in `infile_name`, update `new_selection` logic, and simplify page range and input processing.

…, replace redundant file warning logic in `handlePageSpecs`, and simplify resource management.

…page_heap` and `page_spec_qpdfs`, simplify file handling, and improve code clarity.

…n` method, and update logic for handling page specifications.

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

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

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

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

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

…mbers`, update related logic, and clean up obsolete code.

…:Members`, update related logic, and remove obsolete declarations.

…StreamLength`, `computeDeterministicIDData`, and `calculateXrefStreamPadding` to `QPDFWriter::Members`. Update related logic and remove obsolete declarations.

…rs`, update encryption and stream handling logic, and remove obsolete test coverage entries.

…related logic, and remove obsolete test coverage entries.