Legacy Block Extra Data (4) Format
Byte Order
LegacyBlockExtraData is stored in Little Endian byte order.
Parsing The LegacyBlockExtraData
| Name | Size (in bytes) | Description |
|---|---|---|
| Extra Block Count | 4 | The number of extra blocks in this chunk |
Now loop the next section Extra Block Count times until you have parsed all extra blocks.
| Name | Size (in bytes) | Description |
|---|---|---|
| Block Location Index | 4 | The extra block location within this chunk represented as the index into the blockId array[1] |
| Block ID | 1 | The extra blocks Id |
| Block Data | 1 | The extra blocks data value |
Notes
- If used with Subchunks (Subchunk Versions 0, 2 - 7) the Block Location Index stores the coordintes relative to the subchunk instead with the first byte containing the Y value in the right 4 bits, and the second byte containing the X value in the left 4 bits, and the Z value in the right 4 bits. The last 2 bytes are unused in this case. the index can then be calculated with
X × 16 × 16 + Z × 16 + Y.