Try to fix a 0cc/FTM file by writing copies with certain chunks missing

fix_0cc.py

#!/usr/bin/python3
import sys


def read_block():
    block_id = f.read(16)
    version = f.read(4)
    size = f.read(4)
    contents = f.read(int.from_bytes(size, "little"))
    return block_id, version, size, contents


def read_contents(write_func=lambda *x: None, ignore=-1):
    header = f.read(18)
    version = f.read(4)

    write_func(header, version)

    c = 1
    while True:
        try:
            block_id, version, size, contents = read_block()
            if block_id == b'':
                return c

            if c != ignore:
                write_func(block_id, version, size, contents)
                print(block_id)
            else:
                print('ignoring', block_id)
            c += 1
        except Exception as e:
            print(e, repr(e))


with open(sys.argv[1], 'rb') as f:
    total_blocks = read_contents()
    for i in range(1, total_blocks + 1):
        fn = f'{sys.argv[1]}.removed_{i}.0cc'
        with open(fn, 'wb') as outf:
            f.seek(0)
            def write_func(*x):
                for i in x:
                    outf.write(i)

            total_blocks = read_contents(write_func, i)