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Filepaths get incorrectly decoded leading to files being extracted in the wrong directory

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評估

難度
3/5
預估耗時
1-2 天
新手友好度
68/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
python
領域
backend

研究方向

Start by extracting the attached minimal archive after repackaging it as a .tar.xz on Debian 13, then trace how Extractcode decodes archive member paths and handles the +dfsg/LICENSES/Qt- segment. Compare the resulting path with the expected qt6-webengine-6.8.2+dfsg/LICENSES/Qt-GPL-exception-1.0.txt. Done means extraction preserves the directory structure and filename for this example.

由索引模型根據 Issue 內容生成。

描述

We are using Extractcode to extract large open source archives.
We have found a case where after extraction files some files from subdirectories are extracted into the extraction root and given very long and partially gibberish names.

This happened specifically upon extracting qt6-webengine 6.8.2+dfsg-4 (http://deb.debian.org/debian/pool/main/q/qt6-webengine/qt6-webengine_6.8.2+dfsg-4.debian.tar.xz).

After extraction the file qt6-webengine-6.8.2+dfsg/LICENSES/Qt-GPL-exception-1.0.txt was found in the extraction root with filename qt6-webengine-6.8.2Min _nyopeQu _ GPL-exception-1.0.txt

After some investigation we found that +dfsg/LICENSES/Qt- is being incorrectly decoded as UTF-7, leading to a full-path of qt6-webengine-6.8.2痻\u20fc눂ე葋\uf42dGPL-exception-1.0.txt which is the transliterated to qt6-webengine-6.8.2Min _nyopeQu _ GPL-exception-1.0.txt This means that the directory structure of the file is entirely lost and the file gets extracted to the extraction root instead of the correct directory.
The same happens for a selection of other files in the archive, but not reliably for every file. We were not able to determine what specifically triggers the issue, our assumption is that it has to do with Kanji encoding in some form (e.g. if the final part of a path can theoretically be decoded as a Kanji it incorrectly assumes it is UTF-7 encoded).

We have attached a minimal example of this (note: we had to package it as a .zip due to file support limitations on github, for testing it should be extracted and then reachived as a .tar.xz) with only this Qt-GPL-exception-1.0.txt file contained for easier verification and testing.
qt6-webengine-6.8.2+dfsg.zip

We were able to reproduce the issue reliably on a Debian 13 system, the issue was not reproducible on a Windows 11 machine.

主要語言
Python
星號
39
分支
23
PR 合併指標
30 天內沒有已合併 PR

環境準備

這個專案沒有提供開發容器、Dockerfile 或貢獻指南,環境需要你自己搭建:先看它的 README,通用步驟見我們的新手貢獻指南。

從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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