Last modified: 2014-10-16 12:08:23 UTC
zimdiff/zimpatch must be able to rebuild exactly the same file like the original one. Do achieve this, they need to know what was the cluster size used by the zimwriter. The zimlib should implement a solution to deliver this information.
Adding a new header entry informing about the cluster size seems the best approach. We may add a new sub-version of the formar. In any case, this shouldn't break anything: old version of the zimlib (and any good ZIM reader) should be able to read these "new" files.