jpeg_file.py

#!/usr/bin/env python3

# probuje bit po bicie, pillow mi się wywalał na oryginalnym pliku
# https://files-quals.seccon.jp/tktk-892009a0993d079214efa167cda2e7afc85e6b9cb38588cba9dab23eb6eb3d46

from PIL import Image
from io import BytesIO

file = open("broken.jpg", "rb")
data = list(file.read())

for i in range(0, len(data)):
  for j in range(0, 8):
    org = data[i]
    data[i] = data[i]^(1<<j)
    try:
      im = Image.open(BytesIO(bytes(data)))
      im.save(f"good{i}x{j}.jpg", "jpeg")
      print(f"{i}:{j}")
    except IOError:
      pass
    data[i] = org
    
# best output in good623x1.jpg