byte[] GetCompressedBlocks(Map map) {
bool customBlocks = Supports(CpeExtension.CustomBlocks);
if (customBlocks && Supports(CpeExtension.BlockDefinitions))
return map.GetCompressedCopy(map.Blocks);
byte[] blocks = customBlocks ?
map.GetCPEFallbackMap() : map.GetFallbackMap();
return Map.MakeCompressedMap(blocks);
}