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Support ULMO (LZMA) and ULFO (LZFSE) compression #128

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MrAlex94 opened this issue Mar 22, 2022 · 7 comments
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Support ULMO (LZMA) and ULFO (LZFSE) compression #128

MrAlex94 opened this issue Mar 22, 2022 · 7 comments
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enhancement help wanted
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1.1

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@MrAlex94
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There are some more modern compression formats supported:

  • ULFO - LZFSE/LZVN-compressed, read-only; extension I<.dmg>;
    create and use on 10.11 ("El Capitan") and later only
  • ULMO - LZMA-compressed, read-only; extension I<.dmg>;
    create and use on 10.15 ("Catalina") and later only
@aonez
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aonez commented Mar 23, 2022

Will be interesting to test the differences in size.

PRs are welcome :)

@MrAlex94
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Have some comparisons here! The .app has various binaries, images and text files within. Then measuring execution time of the script with different algorithms using xcrun xctrace record --template='Time Profiler' --launch -- ./create-dmg.

Size Format Reduction Execution Time
187M Uncompressed.app -- --
54M ULMO.dmg ~71% 23s
64M UDBZ.dmg ~66% 21s
70M UDZO.dmg ~62% 20s
70M ULFO.dmg ~62% 20s

Will create PR soon.

aonez added a commit that referenced this issue Apr 8, 2022
@aonez
Merge pull request #130 from MrAlex94/patch-1
8c7b55f 
Issue #128 - Add support for ULFO and ULMO formats
aonez added a commit that referenced this issue Apr 8, 2022
@aonez
Add disk image formats available in description
0da4291 
#128
@aonez
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aonez commented Apr 8, 2022

Again thanks for this one, is a nice addition. Just tried it with the Keka package and there're great savings if the contents are 10.11+ or 10.15+.

@MrAlex94
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No problem! :-)

@aonez aonez added this to the 1.1 milestone Jun 2, 2022
@ann0see ann0see mentioned this issue Jun 22, 2022
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@rcoup rcoup mentioned this issue Jun 29, 2023
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@Aleksid1
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How I can enable ULMO (LZMA) and ULFO (LZFSE) compression method for my DMG?

@pzhlkj6612
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@Aleksid1

How I can enable ULMO (LZMA) and ULFO (LZFSE) compression method for my DMG?

  • --format: specify the final image format (UDZO|UDBZ|ULFO|ULMO) (default is UDZO)

https://github.com/create-dmg/create-dmg/blob/b62ae1dd11ac0a3e17ea944384104450d800f04c/README.md#usage

@Aleksid1
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Many thanks! I've got it.

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@aonez @MrAlex94 @pzhlkj6612 @Aleksid1