find_block.py

import zlib
class BoundBuffer(object):
    buff = b''
    cursor = 0

    def __init__(self, data=b""):
        self.write(data)

    def read(self, length):
        if length > len(self):
            print("things are bad!")
            return None
        out = self.buff[self.cursor:self.cursor + length]
        self.cursor += length
        return out

    def write(self, data):
        self.buff += data

    def sub_buffer(self, pos):
        return BoundBuffer(self.buff[pos:])

    def __len__(self):
        return len(self.buff) - self.cursor

def readChunk(buffer, i):
    # print(f"Loading chunk {i}...")
    chunk_length = int.from_bytes(buffer.read(4), byteorder="big")
    # print(f"Chunk {i} has a length of {chunk_length}")
    buffer.read(1)
    chunk = zlib.decompress(buffer.read(chunk_length))
    # print(f"Checking chunk {i} for Crystalline Quartz")
    if "cinderscapes:crystalline_quartz" in str(chunk):
        with open(f"decompressed_{i}.dat", 'wb') as file_out:
            file_out.write(chunk)
        print("ABBA QUARTZ FOUND")

with open('C:\\Modded Minecraft\\backup\\world\\DIM-1\\region\\r.0.0.mca', 'rb') as f:
    region = BoundBuffer(f.read())
    for i in range(1024):
        offset = int.from_bytes(region.read(3), byteorder="big")
        print(f"Found offset for chunk {i}: {offset}")
        offset = offset * 4096
        readChunk(region.sub_buffer(offset), i)
        region.read(1)