change in behavior after updating unzOpen to unzOpen2_64 (unzip.c) function.

[awinatri]

earlier code snippet (C++/windows):
{
CFileException fe;
CStdioFile fileTest;
fileTest.Open(zipfilename, CFile:modeReadWrite | CFile::shareDenyWrite, &fe);
// additional code

unzFile uf = unzOpen(zipfilename); // function call succeed
}

update code that is not working:
{
CFileException fe;
CStdioFile fileTest;
fileTest.Open(zipfilename, CFile:modeReadWrite | CFile::shareDenyWrite, &fe);
// additional code

zlib_filefunc64_def ffunc;
fill_win32_filefunc64W(&ffunc);
uf = unzOpe2_64(zipfilename, & ffunc); //function call fails
}

[Neustradamus]

@madler: Can you look this ticket?

[dbjh]

I may be reading this wrong, but from https://github.com/madler/zlib/blob/develop/FAQ#L344:

41. I'm having a problem with the zip functions in zlib, can you help?

There are no zip functions in zlib. You are probably using minizip by
Giles Vollant, which is found in the contrib directory of zlib. It is not
part of zlib. In fact none of the stuff in contrib is part of zlib. The
files in there are not supported by the zlib authors. You need to contact
the authors of the respective contribution for help.

If I then check https://github.com/madler/zlib/blob/develop/contrib/minizip/unzip.c#L5:

Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )

Apart from contacting him through the means listed on that web page, you can also try contacting him here on GitHub: https://github.com/gvollant.

[Neustradamus]

@gvollant: Can you look this ticket?