获取中兴光猫 F652 超级密码

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import zlib
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import struct
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import os
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def unzip_config(fname: str) -> str:
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    if not os.path.exists(fname):
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        print('文件不存在！')
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        return ''
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    with open(fname, 'rb') as f:
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        next_off = 60
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        result = bytearray()
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        while next_off > 0:
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            f.seek(next_off)
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            # 读取缓冲区大小
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            buffer_size = struct.unpack('>I', f.read(4))[0]
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            # 读取压缩块大小
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            block_size = struct.unpack('>I', f.read(4))[0]
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            # 读取下一块位置
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            next_off = struct.unpack('>I', f.read(4))[0]
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            # 复制压缩数据块到临时数据流
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            compressed_data = f.read(block_size)
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            # 解压数据块
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            decompressed_data = zlib.decompress(compressed_data)
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            # 将解压后的数据添加到结果
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            result.extend(decompressed_data)
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        return result.decode('utf-8')
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def write_output(data: str, output_fname: str):
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    with open(output_fname, 'w', encoding='utf-8') as f:
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        f.write(data)
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# 使用示例
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result = unzip_config('db_user_cfg.xml')
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if result:
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    write_output(result, 'output.xml')
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    print('结果已写入 output.xml')