今天的文章来自 盏茶作酒 同学。他在老电脑中发现了一个加密的 zip 文件,于是用 Python 破解了文件密码。在破解的过程中出现了内存爆炸的问题,通过阅读 Python 源代码找到了解决方案。
下面就来给大家分享一下他的操作。
Python 有一个内置模块 zipfile 可以解压 zip 压缩包。先来测试一波:创建一个测试文件,压缩,设置解压密码为123。
运行效果如下图所示,提取成功。
既然如此,那我不停尝试所有可能的密码组合去解压缩不就行了嘛~
好了,开始破解老文件的密码。
为了提高速度,我还加了多线程的代码:
然而,事情并没有那简单……
代码跑一会儿,内存爆了!
于是,为了找寻问题所在,我就去查看了一下源码,发现ThreadPoolExecutor默认使用的是无界队列。而程序中尝试密码的速度跟不上生产密码的速度,就会把生产任务无限添加到队列中。导致内存被占满。内存直接飙到95:
找到病根儿,剩下的就是对症下药了。
继承并重写了ThreadPoolExecutor类中的_work_queue属性,将无界队列改成有界队列,这样就不会出现内存爆满的问题,看代码:
用自定义的BoundedThreadPoolExecutor类替代前面代码中的ThreadPoolExecutor。
再次执行……
程序输入如下图内容:
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break-word !important;"><section data-tool="mdnice编辑器" data-website="https://www.mdnice.com" data-mpa-powered-by="yiban.io" style="padding-right: 10px;padding-left: 10px;max-width: 100%;font-size: 16px;word-break: break-word;text-align: left;line-height: 1.75;color: rgb(89, 89, 89);font-family: Optima-Regular;letter-spacing: 2px;background-size: 20px 20px;background-position: center center;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="max-width: 100%;font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section powered-by="xiumi.us" style="max-width: 100%;letter-spacing: 0.544px;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section label="Powered by 135editor.com" data-role="outer" style="max-width: 100%;box-sizing: 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