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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.
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This change updates all occurrences of `std::endl` to `\n` across various files for improved efficiency and consistency. It reduces unnecessary flushing of output buffers associated with `std::endl` while maintaining the same output format.
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Fixes oss-fuzz case 394129398. Issue arose from chaining multiple runlength filters and inflating a compressed stream of ~100 bytes to several gigabytes. There is no obvious fix without imposing an arbitrary implementation limit and therefore potentially excluding valid PDF files.