Поиск png в бинарных файлах

FindPng.py

import random

with open('wiatArms.is','rb') as file:
	data = file.read()


def save_File(data,filename):
	with open(f'{filename}.png','wb') as file:
		file.write(data)

start_png = -1
end_png = 0
i = 0
while True:
	start_png = data.find(bytes.fromhex('89 50 4E 47 0D 0A 1A 0A'),start_png+1)
	end_png = data.find(bytes.fromhex('49 45 4E 44 AE 42 60 82'),end_png)+8

	if start_png == -1:
		break

	print(f'Start:{start_png}')
	print(f'End:{end_png}')
	save_File(data[start_png:end_png],i)
	i = i + 1