OpenSystemsDevelopment / qpdf

Introduce null checks for `callbacks` in `QPDFObjectHandle` to allow content streams to be parsed without ParserCallbacks. Update `QPDFJob` to pass `nullptr` instead of `DiscardContents` for parsing.

…or deterministic ID generation (fixes #1235).

…ity, and replace deprecated API usage.

…ace manual index handling, revise min/max initialization to use `std::numeric_limits`, and optimize shared identifier assignments.

… numbers and related variables, replacing `int`, to enhance consistency and avoid unnecessary checked conversions.

…r,  and revise enum initialization. Clean up unused error handling in linearization logic.

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

…bnail processing loop to ensure consistency.

…uring robustness against damaged PDFs.

…eams, improving robustness against damaged PDFs.

Refactor Pl_Base64

…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`.

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

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

…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.

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.

…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