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User talk:Rick/Save research
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Using this info and some other resources I've scrounged up a bit of python code that will extract the chunks. I hope this is useful to someone. they seem to be one file broken up into 20k chunks. Useable on other dat files.
Usage: python script.py world.dat
a copy of World.dat must be in same directory as script.
import zlib, struct, sys
def main(args):
fp = file(args[0], 'rb')
i = 1
while True:
data = fp.read(4)
if len(data) != 4:
break
length = struct.unpack('<L', data)[0]
file('Chunk_%i.dat' % i, 'wb').write(zlib.decompress(fp.read(length)))
i += 1
if __name__=='__main__':
sys.exit(main(sys.argv[1:]))