BFFNT OverflowError: signed integer is greater than maximum

[Enovale]

When extracting a large BFFNT (8 MB), the program returns

OverflowError: signed integer is greater than maximum

It extracts many other, smaller BFFNT's successfully but not the larger one.

EDIT: This is a Switch BFFNT

[Tyulis]

Wow, I never seen any OverflowError in Python for years ! Anyway. I don't have enough info. Can you send the full console output and eventually the file, to see from where it comes ?

[Enovale]

File: https://anonfiles.com/Q509Kbf8b1/PictureFont80.bffnt

Console Output:

user$ python3 3DSkit.py -x PictureFont80.bffnt

--------PictureFont80.bffnt--------
No compression
BFFNT file found
Extracting...
Traceback (most recent call last):
  File "3DSkit.py", line 248, in <module>
    result = main(args, opts)
  File "3DSkit.py", line 168, in main
    extract_files(filename, args.big, args.format, args.verbose, opts)
  File "3DSkit.py", line 111, in extract_files
    unpack.extract(filename, file, format, endian, verbose, opts)
  File "/Users/user/Downloads/3DSkit-master/unpack/__init__.py", line 16, in extract
    unpacker = cls(*args)
  File "/Users/user/Downloads/3DSkit-master/util/utils.py", line 18, in __new__
    return self.main(*args, **kwargs)
  File "/Users/user/Downloads/3DSkit-master/unpack/BFFNT.py", line 83, in main
    self.readTGLP(data, self.tglpoffset - 8)
  File "/Users/user/Downloads/3DSkit-master/unpack/BFFNT.py", line 134, in readTGLP
    self.extract_underlying_BNTX(data)
  File "/Users/user/Downloads/3DSkit-master/unpack/BFFNT.py", line 186, in extract_underlying_BNTX
    rgba = self.extract_sheet(data, self.sheetwidth, self.sheetheight * self.sheetcount, sheetsize, BNTI_FORMAT_NAMES[format], swizzlesize)
  File "/Users/user/Downloads/3DSkit-master/unpack/BFFNT.py", line 150, in extract_sheet
    libkit.extractTiledTexture(indata, out, width, height, format, swizzlesize, self.byteorder == '<')
OverflowError: signed integer is greater than maximum

It occurred on both Mac and Windows

[Tyulis]

Ok, that's because your file is in an unknown format and the error code was misinterpreted. I fix this and try to add this format

[Enovale]

That seems weird because other buffets from the same game also worked.

[Tyulis]

They have not the same format, this is not a size issue. Try in verbose mode (-v) to see the format of the others, it is probably BC4, which is already supported.

[Enovale]

you're right, the one that doesn't work is RGBA8_SRGB and the others are BC4

[Tyulis]

Done! The error was stupid, the format was almost already supported, I just had to add the Switch swizzling to make it look like something. Now you can also use -O reverse=true to flip it automatically, because it is actually reversed.

[Enovale]

alright, thank you very much