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https://issues.apache.org/jira/browse/DAFFODIL-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guichard Desrosiers reassigned DAFFODIL-3082:
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Assignee: Guichard Desrosiers
> Make GZIP layer compression level configurable
> ----------------------------------------------
>
> Key: DAFFODIL-3082
> URL: https://issues.apache.org/jira/browse/DAFFODIL-3082
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End
> Reporter: Guichard Desrosiers
> Assignee: Guichard Desrosiers
> Priority: Major
>
> Current gzip layer tests use a fixed compression level for deterministic
> output, but level 9 is slow and may not reflect typical DFDL use. Make the
> gzip compression level configurable via layer parameters, with a default of
> -1 to use the JDK/zlib default, and allow tests to set a deterministic level
> when needed.
> Some JDK distributions (e.g., Temurin) bundle their own zlib implementation
> with {{{}java.util.zip{}}}, using the classic stock zlib, while others link
> to the system zlib, which may be stock zlib or zlib-ng depending on the OS.
> With default compression, stock zlib and zlib-ng produce byte-different gzip
> output for the same input. A configurable level (e.g., 0 or 9) lets users
> choose a compression level that yields more deterministic output across
> different JDK/zlib combinations when necessary.
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