BedrockData/README.md

# BedrockData
Blobs of data generated from Minecraft: Bedrock Edition used by PocketMine-MP

### `required_block_states.nbt`
This file contains a network-format NBT list of all the blockstate permutations needed by MCPE's `StartGamePacket`.
It's provided as-is directly from `StartGamePacket` sent by the current vanilla server.

### `block_id_map.json`
This file contains a mapping of all block stringy IDs to legacy numeric IDs (which are still used internally, and still needed by third party developers for conversion and for items).

#### Note
Where a block's legacy ID is > 255, its item ID is `255 - legacyBlockId`. This means prismarine stairs = -2 and so on.

### `r12_to_current_block_map.bin`
This file contains a list of mappings from legacy pre-1.13 blockstates to states of the current version.
This data is obtained by plugging the legacy states into `BlockPalette` in the vanilla BDS using [`pmmp/mapping`](https://github.com/pmmp/mapping), and writing the resulting NBT state obtained.

#### Schema
The following structure is repeated until EOF. There is **no** length prefix, so you have to read to EOF to read all the mappings.
| type | description |
|------|-------------|
| unsigned varint32 | r12 block string ID length |
| byte[] | r12 block string ID |
| little-endian int16 | r12 block metadata |
| TAG_Compound (varint format) | current version NBT blockstate corresponding to the given r12 block |

An example of how to read this file using the PocketMine-MP core library can be seen on the [stable branch](https://github.com/pmmp/PocketMine-MP/blob/41f7c07703bf3f7ef2d9504bbdbdf74257e75d12/src/pocketmine/network/mcpe/convert/RuntimeBlockMapping.php#L71-L86) or on the [master branch](https://github.com/pmmp/PocketMine-MP/blob/master/src/network/mcpe/convert/RuntimeBlockMapping.php#L74-L86).

### `item_id_map.json`
This file contains a mapping of all item stringy IDs to legacy numeric IDs.

### `banner_patterns.json`
This file defines all the known banner pattern types and their crafting requirements.

### `recipes.json`
This file defines all crafting-table, furnace and chemistry recipes. This includes recipes for the smoker, cartography table etc.

### `creativeitems.json`
This file contains an ordered list of items which appear in the vanilla creative inventory with Education Edition and Experimental Gameplay enabled.

### `biome_definitions.nbt`
This file contains a network-format NBT blob containing biome definitions obtained from `BiomeDefinitionListPacket`.

### `entity_identifiers.nbt`
This file contains a network-format NBT blob containing entity identifier mappings obtained from `AvailableActorIdentifiersPacket`.