OpenSystemsDevelopment / qpdf

…uring robustness against damaged PDFs.

Enhance `QPDF_objects` to ignore excessively large object stream IDs …

…eams, improving robustness against damaged PDFs.

Refactor Pl_Base64

Enhance `QPDFParser` sanity checks after xref recovery to include par…

…oding/decoding logic, and simplify usage in `JSON_writer` and `QPDF_json`.

…view` for encoding/decoding, improving memory efficiency and simplifying buffer management

…e` and `finish` logic

…cing buffered reads with direct data extraction from `InputSource`.

Refactor `NNTree` to encapsulate warning and error handling

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

Add check for shared appearance stream in QPDFFormFieldObjectHelper

Ensure an appearance stream is not shared  before generating text appearances, improving error handling and data integrity.

Refactor is::OffsetBuffer and BufferInputSource

…string`, improving performance, simplifying stream data handling, and reducing dependency on `BufferInputSource`.

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

…ancy and improving initialization consistency.

…ndant methods for improved code clarity.

…ng encapsulation and maintainability.

Simplify QPDFWriter pipeline management

Replaced raw key pointer and length parameters with a `std::string` in `Pl_AES_PDF` and `Pl_RC4` constructors for improved safety and clarity. Updated all usage sites accordingly, reducing reliance on manual memory management and redundant conversions.

…proved clarity and reduced indirection in pipeline management.

…proved clarity and reduced indirection in pipeline management.

…buffer handling and streamline compression.

…n and improve separation of concerns.

Refactor the QPDFWriter pipeline stack

…pping, remove redundant `PipelinePopper` usage, and improve encapsulation of MD5 handling.

# Conflicts:
#	libqpdf/QPDFWriter.cc

…implifying ID management and ensuring consistent initialization.

…y management and eliminate redundant `dynamic_cast` logic.

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

…line `linearization pass1` logic  when writing pass1 file

…te encryption handling

…mplified pipeline stack management in `QPDFWriter`.

…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.