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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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Steve Lawrence resolved DAFFODIL-3082.
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Fix Version/s: 4.2.0
Resolution: Fixed
Fixed in commit f66cafefc8471a93425ad61df999a40b78e3ca43
> 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
> Fix For: 4.2.0
>
>
> Currently, the gzip layer always uses java.util.zip.GZIPOutputStream at the
> JDK's default compression level (which zlib resolves to level 6) when
> unparsing. There is no way for a schema or user to choose a different level.
> Make the gzip compression level configurable via a new DFDL layer parameter
> variable, `gz:compressionLevel`. Valid values:
> 0 no compression
> 1-9 increasing compression, 1 = fastest and 9 = best compression
> -1 sentinel meaning "use the implementation default" (level 6)
> The variable should default to -1 and be declared external="true" so users
> can set it without having to modify the schema. Additionally, it can be set
> in schema via `dfdl:newVariableInstance` and `dfdl:setVariable`.
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