checksum calculation algorithm

[SerhiiKalita]

can you provide the checksum calculation algorithm?

[kimikage]

Although there is some ambiguity there, it is as stated in the specifications.

To add to the description in the specification, what is summed is not the decoded bitmap, but the encoded byte sequence.
Also, the checksum code is recorded as a complement. Therefore, the sum including the checksum code should be 0xff.

[JackDesBwa]

I had the same question. By testing different algorithms, it looks like this one works on the .goo file generated by Voxeldance Tango 4.0.15.04 (according to the headers) that I used for testing:

checksum = 0
for b in rle_data:                                                                                                                                          
  checksum = (checksum + b) & 0xff
checksum = (~checksum) & 0xff

i.e. bitwise NOT of the sum of the bytes of the RLE data