[Bug 1004368] Re: unzip shows the wrong date for zip files created on windows
Dominik Viererbe
1004368 at bugs.launchpad.net
Wed May 31 13:26:45 UTC 2023
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** Changed in: unzip (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1004368
Title:
unzip shows the wrong date for zip files created on windows
Status in unzip package in Ubuntu:
Incomplete
Bug description:
I have a zip file created by winzip. Later using winzip files were
replaced.
Both windows built-in zip viewer and winzip show the replaced files
dates of the newly replaced file.
On ubuntu precise the old date (of the original files) are shown.
Using zipinfo -v I have listed the info in the zip file (only the info of 1 file shown here for clarity), see below.
It appears that there are 3 file modification dates stored, of which windows uses the DOS Date/Time (as they would) and unzip uses the UT extra field time.
However, on replacing the file winzip appearently has chosen to update
only tyhe DOS Date/Time field.
This may be a bug of winzip, it is however causing problems for Ubuntu
users.
The expected behavior would be:
- if the file is created on DOS/Windows ( file system or operating system of origin: MS-DOS, OS/2 or NT FAT)
- use file last modified on (DOS date/time).
Ferry
output of zipinfo:
++++++++++++++
zipinfo -v GRB-120411
Archive: GRB-120411.zip
There is no zipfile comment.
End-of-central-directory record:
-------------------------------
Zip archive file size: 24810 (00000000000060EAh)
Actual end-cent-dir record offset: 24788 (00000000000060D4h)
Expected end-cent-dir record offset: 24788 (00000000000060D4h)
(based on the length of the central directory and its expected offset)
This zipfile constitutes the sole disk of a single-part archive; its
central directory contains 5 entries.
The central directory is 416 (00000000000001A0h) bytes long,
and its (expected) offset in bytes from the beginning of the zipfile
is 24372 (0000000000005F34h).
Central directory entry #1:
---------------------------
120411-1-2-np.drl
offset of local header from start of archive: 0
(0000000000000000h) bytes
file system or operating system of origin: MS-DOS, OS/2 or NT FAT
version of encoding software: 2.0
minimum file system compatibility required: MS-DOS, OS/2 or NT FAT
minimum software version required to extract: 2.0
compression method: deflated
compression sub-type (deflation): normal
file security status: not encrypted
extended local header: no
file last modified on (DOS date/time): 2012 May 7 15:29:06
file last modified on (UT extra field modtime): 2012 Apr 23 13:45:44 local
file last modified on (UT extra field modtime): 2012 Apr 23 11:45:44 UTC
32-bit CRC value (hex): 672661c0
compressed size: 262 bytes
uncompressed size: 518 bytes
length of filename: 17 characters
length of extra field: 24 bytes
length of file comment: 0 characters
disk number on which file begins: disk 1
apparent file type: text
non-MSDOS external file attributes: 81B600 hex
MS-DOS file attributes (20 hex): arc
The central-directory extra field contains:
- A subfield with ID 0x5455 (universal time) and 5 data bytes.
The local extra field has UTC/GMT modification/access times.
- A subfield with ID 0x7875 (Unix UID/GID (any size)) and 11 data bytes:
01 04 e9 03 00 00 04 e9 03 00 00.
There is no file comment.
++++++
lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
++++++++++++++++++
apt-cache policy unzip
unzip:
Geïnstalleerd: 6.0-4ubuntu1
Kandidaat: 6.0-4ubuntu1
Versietabel:
*** 6.0-4ubuntu1 0
500 http://nl.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
100 /var/lib/dpkg/status
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