Extract ap51-flash combined ext image

explode-ce.py

#!/usr/bin/env python3

import hashlib
import sys

f = open(sys.argv[1], 'rb')

ce_version = f.read(4)
assert ce_version == b'CE01'

img_type = f.read(32).strip().decode()
print('Image type:', img_type)

file_num = int(f.read(2), 16)
print('Image contains', file_num, 'files')

files = []

for _ in range(file_num):
    filename = f.read(32).strip().decode()
    size = int(f.read(8), 16)
    md5 = f.read(32).decode()
    files.append((filename, size, md5))

f.seek(0x10000)

for filename, size, md5 in files:
    print('Extracting', filename, 'size', size, 'md5', md5)

    data = f.read(size)
    assert hashlib.md5(data).hexdigest() == md5

    with open(filename, 'wb') as fw:
        fw.write(data)