Re: Img package 1.4.13 broken

Am 20.11.2024 um 21:36 schrieb Helmut Giese:

Hello out there,
the Img package distributed with the latest versions of Tcl contain a
bug - well, not really 'Img' itself but rather the zlib DLL it uses.
 Here is what happened:
When trying to run the second example from
 https://wiki.tcl-lang.org/page/CollapsableFrame+%2DA+Toggle+Resized+Labelled+Frame+Container
I got the error
IDAT: invalid distance too far back
while executing
image create photo iconeClose -format png -data $data
...
with data being defined as
         set data
"iVBORw0KGgoAAAANSUhEUgAAABAAAAAOCAIAAAHeSjtLAAAABGdBTUEAAYagMei\
WXwAAAKBJREFUCJmlUCESxCAMXJiIPqfyJOJEn8WTIpGRJxEInoKoOAGTo6X05uZ2EGw2ySYxZS8ALIC\
coqmMcooATNlL/QEgAMyhkpbXFM1hDhYdSAs+3db1oaEYX8yBlOCIJpwqzvaK7bnZnOJCS//qcGcP7Wn\
HPl+Ei6nagt77MV1EDne8B3MQEVI+uij6e9FMmDWabjfDHwWX84xx45z7yeENMlJR1s8KWugAAAAASUV\
ORK5CYII="
 I found a mention of this error in
https://mirror.netzwerge.de/openbsd/Changelogs/ChangeLog.62
Search for 'invalid distance' , 2nd occurrence.
 There it is said that this error was introduced in zlib 1.2.2.2 and
fixed - I think - by this commit
CVSROOT: /cvs
Module name: src
Changes by: tb@cvs.openbsd.org 2022/03/25 04:58:39
 It's long ago that I filed a bug and have forgotten how and where.
If you consider it a bug, too, I would be glad for a note how to
report it.
Helmut

Hi Helmut,
I can confirm, that the example script gives the mentioned error, if using Img 1.4.17.
It does however work, if using the latest Img version 2.0 or if using the native Tk PNG parser.
As the Img 1.4.X branch is not supported anymore (see https://tkimg.sourceforge.net/history.html#Version_1_4_17),
I have no plans to fix this specific bug.
Regards,
Paul