Guichard Desrosiers created DAFFODIL-3082:
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Summary: 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
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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