https://bugs.kde.org/show_bug.cgi?id=502331
Bug ID: 502331
Summary: Ark cannot load Zstandard (zstd) archives compressed
with --long=28 or higher
Classification: Applications
Product: ark
Version: 25.03.90
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: elvis.angelac...@kde.org
Reporter: t...@nijstekje.nl
CC: rthoms...@gmail.com
Target Milestone: ---
SUMMARY
Ark cannot load Zstandard (zstd) archives that are compressed with `--long=28`
(or higher).
The command line tool `zstd` also throws an error that "Frame requires too much
memory for decoding" when just doing `zstd -d file.tar.zst`, but passing
`--long=...` to the decompression command works fine (e.g. `zstd --long=28 -d
file.tar.zst`).
The `--long=28` (or higher) option is useful for most desktop/laptop users,
because it can significantly enhance compression on folders/file whose size is
over 100 MB at the cost of some (trivial amount of) memory and a very small
increase in compression time.
I also think that `--long` should be enabled by default in Ark when compressing
to zstd, because it can significantly enhance compression at almost no speed
cost.
For example, compressing the 1326 MiB GE-Proton9-27 folder at level 15 yields
an archive of 385 MiB in 14 seconds, but just 283 MiB in 15 seconds when
`--long=29` is used. That's 102 MiB less for just one extra second. To achieve
a similar compression without using `--long`, the compression level needs to be
increased to level 21 which takes 84 seconds (and even then the archive is
still larger at 288 MiB).
As `--long` is the same as `--long=27` and corresponds to 128M of memory it
would be the safest default, but `--long=28` at 256M or `--long=29` at 512M are
good defaults too, considering that most desktop/laptop users have at least 8
GB of system memory.
STEPS TO REPRODUCE
1. Create zstd archive with `--long=28` (or higher, up to 31).
2. Try to open archive with Ark.
OBSERVED RESULT
The following error is shown: `Loading the archive ‘file.tar.zst’ failed with
the following error: Archive corrupted or insufficient permissions.`
EXPECTED RESULT
The archive gets loaded and can be used/extracted.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.9.0
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