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Arrange to keep only the Outline entries that still refer to
valid pages.
More specifically, leaf outline entries that refer to pages that
are elided are not dropped. Non leaf outline entries that refer
to pages that have been elided are kept (for the sake of the
children) but have NULL destinations.
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When cleaning a file, we discard any Annot entries that no longer
point to genuine pages. Or at least, we should have done, were it
not for the fact that we only handled the /A form of Annots, and
not the /Dest form of annots. Fixed here.
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In preparation of adding pdf_write_document that writes a document
to a fz_output stream.
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Separate naming of functions that save complete files to disk
from functions that write data to streams.
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The new pdfclean sanitize functionality mean that mutool now
needs the data files, so maintaining the split that was designed to
keep data files out of mutool is no longer viable.
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Michael needs to be able to call pdfclean from gsview. At the moment
he's having to do this by including the pdfclean.c file into the lib
build, and then calling pdfclean_main with a faked up command line.
This isn't nice.
pdfclean.c is implemented by pdfclean_main parsing the options/filenames
out of argv and then passing the filenames/options on to a
pdfclean_clean function.
This seems like a much nicer API to offer to the world.
We therefore pull the guts of pdfclean.c (pdfclean_clean and its
subsidiary structures/functions) into pdf-clean-file.c and include
this in the library build.
This leaves pdfclean.c just as the command line parsing.
This should not affect the size of any of the resulting binaries.
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