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bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file
From: |
Stephen Berman |
Subject: |
bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file |
Date: |
Thu, 24 Sep 2020 22:40:15 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
On Thu, 24 Sep 2020 22:25:23 +0200 Andreas Schwab <schwab@linux-m68k.org> wrote:
> On Sep 24 2020, Stephen Berman wrote:
>
>> In case it helps, here is the final byte sequence in the file (I've
>> replace the control characters and raw bytes by ASCII representations):
>>
>> PK^E^F\377\377\377\377%^@%^@\377\377\377\377\377\377\377\377^@^@
>
> That means the archive is in ZIP64 format. See
> <https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT>. The real
> values are contained in the zip64 end of central directory record, which
> has "PK\6\6" as the signature.
Thanks. But then it seems that arc-mode.el doesn't handle this format
correctly: archive-zip-summarize has this code:
(let ((p (archive-l-e (+ (point) 16) 4))
files)
(when (= p -1)
;; If the offset of end-of-central-directory is -1, this is a
;; Zip64 extended ZIP file format, and we need to glean the info
;; from Zip64 records instead.
But the first value returned by archive-l-e for this file is 255, not
-1, and on each iteration the value increases, so the ZIP64 code in the
body of the when-clause is never executed.
Steve Berman
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Stephen Berman, 2020/09/24
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Andreas Schwab, 2020/09/24
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file,
Stephen Berman <=
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Eli Zaretskii, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Stephen Berman, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Eli Zaretskii, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Eli Zaretskii, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Stephen Berman, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Eli Zaretskii, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Stephen Berman, 2020/09/25
- bug#43597: 28.0.50; arc-mode.el fails to display a ZIP file, Eli Zaretskii, 2020/09/25