https://bugs.documentfoundation.org/show_bug.cgi?id=33853
--- Comment #13 from MM <[email protected]> --- If this is an issue with libpng, which one did work back then ? Last version that worked for me is Go-OO 3.2.0. LO 3.3.4 under win7 didn't work any longer. Tried different programs, but just a few worked (all microsoft programs), read: loading the extracted sample correctly. Works: IE11, paint, windows photo viewer. Doesn't work: VLC, Media player classic, xnview, Firefox, palemoon, opera dev (just loads the top). Even online converters can't convert them. Seems that all of these last programs have updated their libpng or else microsoft found a way to load these images. When I use pngtest I get the outcome: 'Pass 0: rwrwrwrwrwrwrwrwrwrwrwrwrwrwrw1.png: libpng warning: IDAT: invalid distance too far back libpng error: IDAT: invalid distance too far back' When I use pngfix it says: 'In particular the zlib error: "invalid distance too far back" caused by an incorrect optimization of a zlib stream is fixed in any compressed chunk in which it is encountered. An integrity problem of the PNG stream caused by a bug in libpng which wrote an incorrect chunk length is also fixed.' So it could be an error in zlib or an error in libpng or a bit of both. Maybe the correct way of handling these files are to fix them instead of trying to fix the code. -- You are receiving this mail because: You are the assignee for the bug.
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