How to deserialize (and serialize) Data in Chunk Data packet

On ProcolWiki in Chunk Data there is a Data field with the Byte array type.



If I understand correctly, this field contains most of the information about the chunk (like, what blocks it contains). I need to "decrypt" this field, change some blocks and "encrypt" back (these processes are called deserialization and serialization, right?). And I don't quite understand how to do it (there were attempts to do something there, but unsuccessful). And another problem is that I do not know what deserialization will return. It should return an Array of Chunk Section?


Or maybe I misunderstand everything at all?

 

Have you tried printing the value and looking what's in it?

 

@Kars Yes, i do. But it's just a byte array with a bunch of numbers. Unfortunately, there was nothing there that would give me any clue.