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ZipFile does not supports Unicode Path Extra Field (0x7075) zip header field #86094

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ivansorokintech mannequin opened this issue Oct 4, 2020 · 3 comments
Open

ZipFile does not supports Unicode Path Extra Field (0x7075) zip header field #86094

ivansorokintech mannequin opened this issue Oct 4, 2020 · 3 comments
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3.10 bug and security fixes stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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@ivansorokintech
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ivansorokintech mannequin commented Oct 4, 2020 •
edited by bedevere-bot

BPO 41928
Nosy @agiudiceandrea
PRs
  • bpo-41928: Add support for Unicode Path Extra Field in ZipFile #23736
    		•
    Files
  • 23.zip
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = None
created_at = <Date 2020-10-04.11:21:41.399>
labels = ['type-feature', 'library', '3.10']
title = 'ZipFile does not supports Unicode Path Extra Field (0x7075) zip header field'
updated_at = <Date 2021-01-22.01:30:26.942>
user = 'https://bugs.python.org/ivansorokintech'

    bugs.python.org fields:

    activity = <Date 2021-01-22.01:30:26.942>
actor = 'andreaerdna'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-10-04.11:21:41.399>
creator = 'ivan.sorokin.tech'
dependencies = []
files = ['49491']
hgrepos = []
issue_num = 41928
keywords = ['patch']
message_count = 3.0
messages = ['377931', '377945', '385467']
nosy_count = 2.0
nosy_names = ['ivan.sorokin.tech', 'andreaerdna']
pr_nums = ['23736']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41928'
versions = ['Python 3.10']

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    @ivansorokintech
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    ivansorokintech mannequin commented Oct 4, 2020

    See attached sample. Well-known unzip command line tool lists its contents correctly:

    $ unzip -l 23.zip
Archive:  23.zip
  Length      Date    Time    Name
---------  ---------- -----   
    81408  2012-10-23 19:03   Β' ΦΑΣΗ ΠΕ06 ΣΧΟΛΕΙΑ ΕΑΕΠ (ΙΝΤ).xls

    --------- -------
    81408 1 file

    But ZipFile lists the same file inside this archive as
    ü' öÇæå Åä06 æòÄèäêÇ äÇäÅ (êîÆ).xls

    It's because ZipFile completely ignores Unicode Path Extra Field (0x7075) zip header field.

    See .ZIP specification for details on this field meaning and usage:
    https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT

    @ivansorokintech ivansorokintech mannequin added 3.10 bug and security fixes stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Oct 4, 2020
    @ivansorokintech
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    ivansorokintech mannequin commented Oct 4, 2020

    Grand unified algorithm to read filenames from zip files correctly:

    1. Do zip entry have «Unicode Path Extra Field» (0x7075)? Use it for file name.
    2. Is Unicode flag (0x800) set in «Flags» Field of zip entry? Assume «Filename» Field is in UTF-8.
    3. Do «HostOS» Field of zip entry have values of 0 (FAT) or 11 (NTFS)? Assume «Filename» Field is in OEM charset corresponding to system locale.
    4. Assume «Filename» Field is in UTF-8.

    p7zip with oemcp patch (https://github.com/unxed/oemcp/) uses exactly this method, and is able to process all zip files in my test set correctly (my test set contains several zips generated by different packers on windows, macos, linux, and by online services). The same algorithm should be used in any zip unpacker wishing to process non-latin filenames as gently as possible.

    @agiudiceandrea
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    agiudiceandrea mannequin commented Jan 22, 2021

    I submitted more than a month ago a PR that adds support for Unicode Path Extra Field in ZipFile.
    The PR #23736 is awaiting a review in order to be merged.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
    @bedevere-bot bedevere-bot mentioned this issue Mar 9, 2023
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