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Lazily load MD5 and RC4 once in the life of the program. Only load the legacy provider if RC4 is actually being used.
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From time to time, someone has a problem because their build is grabbing an old version of qpdf header files that are installed somewhere on their system. I am hoping this will put an end to that.
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Some new symbols were exported.
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These markers are being added for nested classes that are already marked with QPDF_DLL_CLASS. They don't make any different on Linux, but they matter on Windows.
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This was broken for cross-compilation and has probably been unnecessary for several years now. Also fix extraneous whitespace in related some tests.
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Remove paragraph about traversal during destruction since this is still necessary with the new implementation.
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Replace operator== and operator!=, which were testing for the same underlying object, with isSameObjectAs. This change was motivated by the fact that pikepdf internally had its own operator== method for QPDFObjectHandle that did structural comparison. I backed out qpdf's operator== as a courtesy to pikepdf (in my own testing) but also because I think people might naturally assume that operator== does a structural comparison, and isSameObjectAs is clearer in its intent.
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QPDFValueProxy wasn't a good name for it. We decided the evil of having the header file be named QPDFObject_private.hh was less than the evil of having the class be named something other than what it should have been named.