Comments (1)
Here are 2 functions that allow you to read a region file header and then get the raw data from them
import zlib, gzip
def GetAnvilChunkData(region, x: int, z: int) -> dict:
"""Returns info stored in anvil header about a chunk at chunk coordinates
Arguments:
region -- a file object created with open('/path/')
x, z -- chunk position (regardless if its region-local or global)
"""
region.seek(4 * ((x % 32) + (z % 32) * 32), 0)
offset = int.from_bytes(region.read(3), byteorder ='big')
sectors = int.from_bytes(region.read(1), byteorder ='big')
region.seek(4 * ((x % 32) + (z % 32) * 32) + 0x1000, 0)
timestamp = int.from_bytes(region.read(4), byteorder ='big')
return dict({'offset': offset,
'sectors': sectors,
'timestamp': timestamp})
def GetChunkNbtData(region, x: int, z: int):
"""Finds chunk data sectors and returns uncompressed buffer with NBT data"""
anvil_data = GetAnvilChunkData(region, x, z)
if anvil_data['offset'] < 2:
return bytes(0)
region.seek(anvil_data['offset'] * 0x1000)
length = int.from_bytes(region.read(4), byteorder ='big')
compression_type = int.from_bytes(region.read(1), byteorder ='big')
if compression_type == 3:
return region.read(length)
if compression_type == 2:
return zlib.decompress(region.read(length))
if compression_type == 1:
return gzip.decompress(region.read(length))
Once you have those you can use code below to read raw nbt data and make a tree.
#!/bin/python
import nbtlib, io
from mvc.mca import GetChunkNbtData
def main():
file = open('data/region.mca', 'rb')
nbt_file = nbtlib.File.from_fileobj(io.BytesIO(GetChunkNbtData(file, 3, 3)))
print(nbt_file.root.keys())
main()
Seems to work fine with my test data from hermitcraft.com S7:
$ python main.py
dict_keys(['Level', 'DataVersion'])
If this gets added then pls credit me, not that I am willing to do that rn myself... sorry have some stuff i want to finish
from nbtlib.
Related Issues (20)
- Add on to a .dat file HOT 1
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- `nbtlib 2.0` HOT 16
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from nbtlib.