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Add Brotli compression to existing System.IO.Compression assembly #11431

marek-safar opened this issue Oct 29, 2018 · 0 comments


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@marek-safar marek-safar commented Oct 29, 2018

Port managed and unmanaged code for Brotli compression types BrotliDecoder, BrotliEncoder, BrotliStream from CoreFX. The code lives under src/System.IO.Compression.Brotli and src/Native/AnyOS/brotli in CoreFX repo. The goal is to use tests from the repo as well.


  • Pass all tests on desktop
  • Pass all tests on XA
  • Pass all tests on XI
  • Update netstandard reference
@marek-safar marek-safar added the task label Oct 29, 2018
@marek-safar marek-safar added this to Backlog in Short Term Projects via automation Oct 29, 2018
@marek-safar marek-safar referenced this issue Oct 29, 2018
11 of 12 tasks complete
Short Term Projects automation moved this from Backlog to Completed Tasks in this Sprint Feb 5, 2019
marek-safar added a commit that referenced this issue Feb 5, 2019
Resolves #11431

I put the native impl to Mono.Native, but probably it should be in a separate lib (`libmono-native.0.dylib` before: **81kb**, after: **898kb**) if Linker is not able to trim it if it's not used.
Compiles and works on Windows (however, we don't build Mono.Native for Windows, but we can borrow `clrcompression.dll` from .net core) and macOS but requires changes in mono/corefx,

I disabled xunit tests as those need 50mb of test data.

PS: Brotli could be fully managed 😢 dotnet/corefxlab#1673

C# ports:

A quick benchmark (Compressing a 5mb file with max compression level=11)
Mono JIT: 25sec
Mono LLVM-AOT: 7.8sec
.NET Core 2.2: 6.8sec
.NET Core 3.0: 5.8sec
.NET Core's BrotliStream (with native lib): 3.5sec

- - official C# port. Based on Java sources, slow, outdated (2 years ago).
@marek-safar marek-safar moved this from Completed Tasks in this Sprint to Done in Short Term Projects Feb 18, 2019
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