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fix-qdf assumes there is exactly one XRef stream and that it is at the end of the file.
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If the value of /CS in the inline image dictionary was is key in the page's /Resource -> /ColorSpace dictionary, properly resolve it by referencing the proper colorspace, and not just the name, in the external image dictionary.
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Fix is based on guidance https://support.microsoft.com/en-us/help/238187/cryptacquirecontext-use-and-troubleshooting and is the proper fix for #285/#286
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This commit adds the preserve_eol flags but doesn't implement EOL preservation yet.
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Even though this is disallowed by the spec, files like this have been encountered in the wild.
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Thanks to Zdenek Dohnal <zdohnal@redhat.com> for contributing the code used for the gnutls crypto provider.
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Just rename MD5 -> MD5_native in place so that git annotate will show the lines as having originated there.
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Includes updates to m4/ax_cxx_compile_stdcxx.m4 to make it work with msvc, which supports C++-11 with no flags but doesn't set __cplusplus to a recent value.
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Various PDF digital signing tools do not encrypt /Contents value in signature dictionary. Adobe Acrobat Reader DC can handle a PDF with the /Contents value not encrypted. Write Contents in signature dictionary without encryption Tests ensure that string /Contents are not handled specially when not found in sig dicts.
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It seems better not to compress signature dictionaries. Various PDF digital signing tools, including Adobe Acrobat Reader DC, do not compress signature dictionaries. Table 8.93 "Entries in a signature dictionary" in PDF 1.5 reference describes that /ByteRange in the signature dictionary shall be used to describe a digest that does not include the signature value (/Contents) itself. The byte ranges cannot be determined if the dictionary is compressed.
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Table 8.93 "Entries in a signature dictionary" in PDF 1.5 reference describes that the value of Contents entry is a hexadecimal string representation when ByteRange is specified. This commit makes QPDF always uses hexadecimal strings representation instead of literal strings for it.
