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start writing anvil file format

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Quinn
2025-04-15 22:23:32 +02:00
committed by Quinn
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docs/mc-data-spec.md
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@@ -128,6 +128,13 @@ The uncompressed data is in NBT format and follows the chunk format.
If the value of compression scheme increases by 128, the compressed data is saved in a file called `c.x.z.mcc`, where x and z are the chunk's coordinates, instead of the usual position.
### MCA format specification
The Anvil file format has some edits compared to the region file format;
- Build height increase from 128 to 256
- Empty sections of the world are not loaded into memory or saved to disk.
- Maximum block ID increased from 265 to 4096. By adding a 4-bit data layer (similar to how metadata is stored).
- Block ordering has been changed from XZY to YZX in order to improve compression.
- Packets for sending chunks has been optimized (a chunk without air is smaller than in the same chunk in the old format, and a chunk with lots of air is even smaller).
- Biomes are saved per X,Z column, rather than being calculated on the fly.
## sources
- https://minecraft.wiki/w/Region_file_format