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Add C API qpdf_oh_free_buffer to release memory allocated by stream data functions
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Add new commands --remove-metadata and --remove-info
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In QPDFWordTokenFinder::check limit the token length
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Tokens longer than the target cannot be a match and therefore there is no need to read to the end of token.
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Fix bugs found during fuzzing
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Return results rather than using reference parameters. Fixes bug in #1272 where parameters were not reinitialized when calling read_bad_entry from read_entry.
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In QPDFParser add a limit on total number of errors in one object
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Currently, QPDFParser gives up attempting to parse an object if 5 near-consecutive bad tokens are encountered. Add a limit of a total of 15 bad tokens in a single object before giving up.
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Refactor QPDF xref table
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Also, delay adjustments for compressed objects until needed by linearization checks.
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Optimistically read subsection headers without reading individual object entries, assuming that they are 20 bytes long as per the PDF spec. If problems are encountered, fall back to calling bad_subsections.
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Replace QPDFXRefEntry with a std::variant of structs.
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Temporarily disable 3 specific-bugs tests. Remove 'xref size mismatch' test.
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Split reconstruction into two passes - scanning of input for objects and insertion of objects into the xref table. This allows insertion to take place in the usual reverse order and removes the need for a separate insert_reconstructed method.
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Rename to Xref_table::process_section. Process trailer processing subsection entries.
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Calculate all subsections before reading subsection entries. Duplicates some warnings for the time being.
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Rename to Xref_table::subsection. Return results instead of using out parameters. Take on responsibility for throwing exception and calculation of offset of first subsection entry.
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Also, remove redundant clearing of the xref tabl during QPDF destruction.
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Do not remove object from xref table as this is only required when the the method is called from within QPDF::Xref_table.
