Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Use executable filter from liblzma #75

Closed
schnaader opened this issue Dec 25, 2017 · 1 comment
Closed

Use executable filter from liblzma #75

schnaader opened this issue Dec 25, 2017 · 1 comment
Assignees
@schnaader
Labels
enhancement low hanging fruits
Milestone
Precomp v0.4.7

Comments

@schnaader
Copy link
Owner

schnaader commented Dec 25, 2017 •
edited

liblzma offers filters that improve compression of executables by about 10%. The result should be similar to using the filter stage of paq8px first and compressing the result:

Operation resulting file size in bytes
Original file: precomp045.exe 1,383,936 bytes
Compressed using Precomp 0.4.6 389,668 bytes
paq8px -0 + Precomp 0.4.6 352,805 bytes
@schnaader schnaader added this to the Precomp v0.4.7 milestone Dec 25, 2017
@schnaader schnaader self-assigned this Dec 25, 2017
schnaader added a commit that referenced this issue Dec 27, 2017
@schnaader
[WIP] First test of liblzma executable filters
1cfd08a 
- See issue #75
- Filter maximum is 4, so up to 3 filters + LZMA2 can be used
- X86+PPC+ARM could be a good default
- TODO: Command line parameter so set or disable filters

- Changed VS settings, so unfortunately there are some tab/space changes in here, too.
@schnaader
Copy link
Owner Author

schnaader commented Feb 14, 2018 •
edited

Result:

Operation resulting file size in bytes
Original file: precomp045.exe 1,383,936 bytes
Compressed using Precomp 0.4.6 389,668 bytes
paq8px -0 + Precomp 0.4.6 352,805 bytes
Precomp 0.4.7dev -lf+x 353,475 bytes

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees

@schnaader schnaader

Labels
enhancement low hanging fruits
Projects
None yet
Milestone
Precomp v0.4.7
Development

No branches or pull requests
1 participant
@schnaader