unzGetCurrentFileZStreamPos64 is missing

[berolinux]

The function unzGetCurrentFileZStreamPos64 - present in the original minizip - doesn't exist in minizip-ng, but is used out there in the wild, most notably by chromium and chromium derived projects.

I've tried to get Chromium to work with zlib-ng+minizip-ng instead of using its bundled copies of zlib+minizip and am almost there (it works in general, but crashes when installing extensions). I think I'm misunderstanding what unzGetCurrentFileZStreamPos64 is expected to do.

https://github.com/OpenMandrivaAssociation/chromium/blob/master/chromium-105-minizip-ng.patch#L28-L31

My guess at what it should do is probably somewhat off (not a zlib/minizip expert...):

uint64_t unzGetCurrentFileZStreamPos64(unzFile zf) {
  unz64_file_pos pos;
  unzGetFilePos64(zf, &pos);
  return pos.pos_in_zip_directory;
}

Would be nice to see unzGetCurrentFileZStreamPos64 in minizip-ng (or alternatively, get a hint on how to port that one missing line correctly).

[nmoinvaz]

I'm not certain that is the same value. It may, be that we need to expose the mz_stream_tell(zip->stream) value. unzGetFilePos64 seems to only return the offset in the central directory, while unzGetCurrentFileZStreamPos64 seems to return the position in the entire zip file.