[okular] [Bug 490153] New: Display zstd compressed postscript files (*.ps.zst) similar to gzip compressed ones *.ps.gz)

[G.Z.E]

https://bugs.kde.org/show_bug.cgi?id=490153

            Bug ID: 490153
           Summary: Display zstd compressed postscript files (*.ps.zst)
                    similar to gzip compressed ones *.ps.gz)
    Classification: Applications
           Product: okular
           Version: unspecified
          Platform: Other
                OS: All
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: PS backend
          Assignee: okular-devel at kde.org
          Reporter: gazso at caesar.elte.hu
  Target Milestone: ---

SUMMARY
Display zstd compressed postscript files (*.ps.zst) similar to gzip compressed
ones *.ps.gz)

STEPS TO REPRODUCE
1. zstd compress and gzip compress a postscipt file
2. open the .ps.gz file
3. open the .ps.zst file

OBSERVED RESULT
Only the .ps.gz is displayed.
Zstd offers far better compression rates with a trained dictionary on relevant
postscript samples

EXPECTED RESULT
.ps.zst

SOFTWARE/OS VERSIONS
pretty much independent.

ADDITIONAL INFORMATION
I hope the dependency to zstd library, available with BSD license is not
triggering legal problems.

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