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Some warnings we'd like to enable for MuPDF and still be able to
compile it with warnings as errors using MSVC (2008 to 2013):
* C4115: 'timeval' : named type definition in parentheses
* C4204: nonstandard extension used : non-constant aggregate initializer
* C4295: 'hex' : array is too small to include a terminating null character
* C4389: '==' : signed/unsigned mismatch
* C4702: unreachable code
* C4706: assignment within conditional expression
Also, globally disable C4701 which is frequently caused by MSVC not
being able to correctly figure out fz_try/fz_catch code flow.
And don't define isnan for VS2013 and later where that's no longer needed.
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Currently, if we spot a bad xref as we are reading a PDF in, we can
repair that PDF by doing a long exhaustive read of the file. This
reconstructs the information that was in the xref, and the file can
be opened (and later saved) as normal.
If we hit an object that is not in the expected place however, we
cannot trigger a repair at that point - so xrefs with duff offsets
in (within the bounds of the file) will never be repaired.
This commit solves that by triggering a repair (just once) whenever
we fail to parse an object in the expected place.
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For historical reasons lots of the code uses "xref" when talking about
a pdf document. Now pdf_xref is a separate type this has become
confusing, so replace 'xref' with 'doc' for clarity.
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Remove the fz_context field to avoid the structure growing.
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