On 25/08/2020 11:07, Stephan Bergmann wrote:
At least when building recent master on recent Fedora rawhide aarch64 with (among others) --with-system-zlib, CppunitTest_sw_htmlexport fails with
[...]
The base64-encoded payload apparently is a PNG image. And from what little I know about PNG, it looks plausible to me that there can be different (compressed) PNG content that decompress to identical raw data, and that the LibreOffice code would be allowed to generate differing (compressed) PNG content for the above data:image/png URL payload.
What supports the theory that "the LibreOffice code would be allowed to generate differing (compressed) PNG content" is the Fedora zlib commit <https://src.fedoraproject.org/rpms/zlib/c/25e9802713484882c27c1f979a6610a42414ee13> "aarch64 optimizations", adding lots of code that presumably is only relevant for aarch64 and presumably changes details of the compression algorithm.
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